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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
| commit | 43a123c1ae6613b3efeed291fa552ecd909d3acf (patch) | |
| tree | fd92518b7024bc74031f78a1cf9e454b65e73665 /src/debug | |
| parent | Initial commit. (diff) | |
| download | golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.tar.xz golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.zip | |
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/debug')
124 files changed, 20477 insertions, 0 deletions
diff --git a/src/debug/buildinfo/buildinfo.go b/src/debug/buildinfo/buildinfo.go new file mode 100644 index 0000000..8bc5753 --- /dev/null +++ b/src/debug/buildinfo/buildinfo.go @@ -0,0 +1,451 @@ +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package buildinfo provides access to information embedded in a Go binary +// about how it was built. This includes the Go toolchain version, and the +// set of modules used (for binaries built in module mode). +// +// Build information is available for the currently running binary in +// runtime/debug.ReadBuildInfo. +package buildinfo + +import ( + "bytes" + "debug/elf" + "debug/macho" + "debug/pe" + "debug/plan9obj" + "encoding/binary" + "errors" + "fmt" + "internal/xcoff" + "io" + "io/fs" + "os" + "runtime/debug" +) + +// Type alias for build info. We cannot move the types here, since +// runtime/debug would need to import this package, which would make it +// a much larger dependency. +type BuildInfo = debug.BuildInfo + +var ( + // errUnrecognizedFormat is returned when a given executable file doesn't + // appear to be in a known format, or it breaks the rules of that format, + // or when there are I/O errors reading the file. + errUnrecognizedFormat = errors.New("unrecognized file format") + + // errNotGoExe is returned when a given executable file is valid but does + // not contain Go build information. + errNotGoExe = errors.New("not a Go executable") + + // The build info blob left by the linker is identified by + // a 16-byte header, consisting of buildInfoMagic (14 bytes), + // the binary's pointer size (1 byte), + // and whether the binary is big endian (1 byte). + buildInfoMagic = []byte("\xff Go buildinf:") +) + +// ReadFile returns build information embedded in a Go binary +// file at the given path. Most information is only available for binaries built +// with module support. +func ReadFile(name string) (info *BuildInfo, err error) { + defer func() { + if pathErr := (*fs.PathError)(nil); errors.As(err, &pathErr) { + err = fmt.Errorf("could not read Go build info: %w", err) + } else if err != nil { + err = fmt.Errorf("could not read Go build info from %s: %w", name, err) + } + }() + + f, err := os.Open(name) + if err != nil { + return nil, err + } + defer f.Close() + return Read(f) +} + +// Read returns build information embedded in a Go binary file +// accessed through the given ReaderAt. Most information is only available for +// binaries built with module support. +func Read(r io.ReaderAt) (*BuildInfo, error) { + vers, mod, err := readRawBuildInfo(r) + if err != nil { + return nil, err + } + bi, err := debug.ParseBuildInfo(mod) + if err != nil { + return nil, err + } + bi.GoVersion = vers + return bi, nil +} + +type exe interface { + // ReadData reads and returns up to size bytes starting at virtual address addr. + ReadData(addr, size uint64) ([]byte, error) + + // DataStart returns the virtual address of the segment or section that + // should contain build information. This is either a specially named section + // or the first writable non-zero data segment. + DataStart() uint64 +} + +// readRawBuildInfo extracts the Go toolchain version and module information +// strings from a Go binary. On success, vers should be non-empty. mod +// is empty if the binary was not built with modules enabled. +func readRawBuildInfo(r io.ReaderAt) (vers, mod string, err error) { + // Read the first bytes of the file to identify the format, then delegate to + // a format-specific function to load segment and section headers. + ident := make([]byte, 16) + if n, err := r.ReadAt(ident, 0); n < len(ident) || err != nil { + return "", "", errUnrecognizedFormat + } + + var x exe + switch { + case bytes.HasPrefix(ident, []byte("\x7FELF")): + f, err := elf.NewFile(r) + if err != nil { + return "", "", errUnrecognizedFormat + } + x = &elfExe{f} + case bytes.HasPrefix(ident, []byte("MZ")): + f, err := pe.NewFile(r) + if err != nil { + return "", "", errUnrecognizedFormat + } + x = &peExe{f} + case bytes.HasPrefix(ident, []byte("\xFE\xED\xFA")) || bytes.HasPrefix(ident[1:], []byte("\xFA\xED\xFE")): + f, err := macho.NewFile(r) + if err != nil { + return "", "", errUnrecognizedFormat + } + x = &machoExe{f} + case bytes.HasPrefix(ident, []byte{0x01, 0xDF}) || bytes.HasPrefix(ident, []byte{0x01, 0xF7}): + f, err := xcoff.NewFile(r) + if err != nil { + return "", "", errUnrecognizedFormat + } + x = &xcoffExe{f} + case hasPlan9Magic(ident): + f, err := plan9obj.NewFile(r) + if err != nil { + return "", "", errUnrecognizedFormat + } + x = &plan9objExe{f} + default: + return "", "", errUnrecognizedFormat + } + + // Read the first 64kB of dataAddr to find the build info blob. + // On some platforms, the blob will be in its own section, and DataStart + // returns the address of that section. On others, it's somewhere in the + // data segment; the linker puts it near the beginning. + // See cmd/link/internal/ld.Link.buildinfo. + dataAddr := x.DataStart() + data, err := x.ReadData(dataAddr, 64*1024) + if err != nil { + return "", "", err + } + const ( + buildInfoAlign = 16 + buildInfoSize = 32 + ) + for { + i := bytes.Index(data, buildInfoMagic) + if i < 0 || len(data)-i < buildInfoSize { + return "", "", errNotGoExe + } + if i%buildInfoAlign == 0 && len(data)-i >= buildInfoSize { + data = data[i:] + break + } + data = data[(i+buildInfoAlign-1)&^(buildInfoAlign-1):] + } + + // Decode the blob. + // The first 14 bytes are buildInfoMagic. + // The next two bytes indicate pointer size in bytes (4 or 8) and endianness + // (0 for little, 1 for big). + // Two virtual addresses to Go strings follow that: runtime.buildVersion, + // and runtime.modinfo. + // On 32-bit platforms, the last 8 bytes are unused. + // If the endianness has the 2 bit set, then the pointers are zero + // and the 32-byte header is followed by varint-prefixed string data + // for the two string values we care about. + ptrSize := int(data[14]) + if data[15]&2 != 0 { + vers, data = decodeString(data[32:]) + mod, data = decodeString(data) + } else { + bigEndian := data[15] != 0 + var bo binary.ByteOrder + if bigEndian { + bo = binary.BigEndian + } else { + bo = binary.LittleEndian + } + var readPtr func([]byte) uint64 + if ptrSize == 4 { + readPtr = func(b []byte) uint64 { return uint64(bo.Uint32(b)) } + } else if ptrSize == 8 { + readPtr = bo.Uint64 + } else { + return "", "", errNotGoExe + } + vers = readString(x, ptrSize, readPtr, readPtr(data[16:])) + mod = readString(x, ptrSize, readPtr, readPtr(data[16+ptrSize:])) + } + if vers == "" { + return "", "", errNotGoExe + } + if len(mod) >= 33 && mod[len(mod)-17] == '\n' { + // Strip module framing: sentinel strings delimiting the module info. + // These are cmd/go/internal/modload.infoStart and infoEnd. + mod = mod[16 : len(mod)-16] + } else { + mod = "" + } + + return vers, mod, nil +} + +func hasPlan9Magic(magic []byte) bool { + if len(magic) >= 4 { + m := binary.BigEndian.Uint32(magic) + switch m { + case plan9obj.Magic386, plan9obj.MagicAMD64, plan9obj.MagicARM: + return true + } + } + return false +} + +func decodeString(data []byte) (s string, rest []byte) { + u, n := binary.Uvarint(data) + if n <= 0 || u >= uint64(len(data)-n) { + return "", nil + } + return string(data[n : uint64(n)+u]), data[uint64(n)+u:] +} + +// readString returns the string at address addr in the executable x. +func readString(x exe, ptrSize int, readPtr func([]byte) uint64, addr uint64) string { + hdr, err := x.ReadData(addr, uint64(2*ptrSize)) + if err != nil || len(hdr) < 2*ptrSize { + return "" + } + dataAddr := readPtr(hdr) + dataLen := readPtr(hdr[ptrSize:]) + data, err := x.ReadData(dataAddr, dataLen) + if err != nil || uint64(len(data)) < dataLen { + return "" + } + return string(data) +} + +// elfExe is the ELF implementation of the exe interface. +type elfExe struct { + f *elf.File +} + +func (x *elfExe) ReadData(addr, size uint64) ([]byte, error) { + for _, prog := range x.f.Progs { + if prog.Vaddr <= addr && addr <= prog.Vaddr+prog.Filesz-1 { + n := prog.Vaddr + prog.Filesz - addr + if n > size { + n = size + } + data := make([]byte, n) + _, err := prog.ReadAt(data, int64(addr-prog.Vaddr)) + if err != nil { + return nil, err + } + return data, nil + } + } + return nil, errUnrecognizedFormat +} + +func (x *elfExe) DataStart() uint64 { + for _, s := range x.f.Sections { + if s.Name == ".go.buildinfo" { + return s.Addr + } + } + for _, p := range x.f.Progs { + if p.Type == elf.PT_LOAD && p.Flags&(elf.PF_X|elf.PF_W) == elf.PF_W { + return p.Vaddr + } + } + return 0 +} + +// peExe is the PE (Windows Portable Executable) implementation of the exe interface. +type peExe struct { + f *pe.File +} + +func (x *peExe) imageBase() uint64 { + switch oh := x.f.OptionalHeader.(type) { + case *pe.OptionalHeader32: + return uint64(oh.ImageBase) + case *pe.OptionalHeader64: + return oh.ImageBase + } + return 0 +} + +func (x *peExe) ReadData(addr, size uint64) ([]byte, error) { + addr -= x.imageBase() + for _, sect := range x.f.Sections { + if uint64(sect.VirtualAddress) <= addr && addr <= uint64(sect.VirtualAddress+sect.Size-1) { + n := uint64(sect.VirtualAddress+sect.Size) - addr + if n > size { + n = size + } + data := make([]byte, n) + _, err := sect.ReadAt(data, int64(addr-uint64(sect.VirtualAddress))) + if err != nil { + return nil, errUnrecognizedFormat + } + return data, nil + } + } + return nil, errUnrecognizedFormat +} + +func (x *peExe) DataStart() uint64 { + // Assume data is first writable section. + const ( + IMAGE_SCN_CNT_CODE = 0x00000020 + IMAGE_SCN_CNT_INITIALIZED_DATA = 0x00000040 + IMAGE_SCN_CNT_UNINITIALIZED_DATA = 0x00000080 + IMAGE_SCN_MEM_EXECUTE = 0x20000000 + IMAGE_SCN_MEM_READ = 0x40000000 + IMAGE_SCN_MEM_WRITE = 0x80000000 + IMAGE_SCN_MEM_DISCARDABLE = 0x2000000 + IMAGE_SCN_LNK_NRELOC_OVFL = 0x1000000 + IMAGE_SCN_ALIGN_32BYTES = 0x600000 + ) + for _, sect := range x.f.Sections { + if sect.VirtualAddress != 0 && sect.Size != 0 && + sect.Characteristics&^IMAGE_SCN_ALIGN_32BYTES == IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE { + return uint64(sect.VirtualAddress) + x.imageBase() + } + } + return 0 +} + +// machoExe is the Mach-O (Apple macOS/iOS) implementation of the exe interface. +type machoExe struct { + f *macho.File +} + +func (x *machoExe) ReadData(addr, size uint64) ([]byte, error) { + for _, load := range x.f.Loads { + seg, ok := load.(*macho.Segment) + if !ok { + continue + } + if seg.Addr <= addr && addr <= seg.Addr+seg.Filesz-1 { + if seg.Name == "__PAGEZERO" { + continue + } + n := seg.Addr + seg.Filesz - addr + if n > size { + n = size + } + data := make([]byte, n) + _, err := seg.ReadAt(data, int64(addr-seg.Addr)) + if err != nil { + return nil, err + } + return data, nil + } + } + return nil, errUnrecognizedFormat +} + +func (x *machoExe) DataStart() uint64 { + // Look for section named "__go_buildinfo". + for _, sec := range x.f.Sections { + if sec.Name == "__go_buildinfo" { + return sec.Addr + } + } + // Try the first non-empty writable segment. + const RW = 3 + for _, load := range x.f.Loads { + seg, ok := load.(*macho.Segment) + if ok && seg.Addr != 0 && seg.Filesz != 0 && seg.Prot == RW && seg.Maxprot == RW { + return seg.Addr + } + } + return 0 +} + +// xcoffExe is the XCOFF (AIX eXtended COFF) implementation of the exe interface. +type xcoffExe struct { + f *xcoff.File +} + +func (x *xcoffExe) ReadData(addr, size uint64) ([]byte, error) { + for _, sect := range x.f.Sections { + if sect.VirtualAddress <= addr && addr <= sect.VirtualAddress+sect.Size-1 { + n := sect.VirtualAddress + sect.Size - addr + if n > size { + n = size + } + data := make([]byte, n) + _, err := sect.ReadAt(data, int64(addr-sect.VirtualAddress)) + if err != nil { + return nil, err + } + return data, nil + } + } + return nil, errors.New("address not mapped") +} + +func (x *xcoffExe) DataStart() uint64 { + if s := x.f.SectionByType(xcoff.STYP_DATA); s != nil { + return s.VirtualAddress + } + return 0 +} + +// plan9objExe is the Plan 9 a.out implementation of the exe interface. +type plan9objExe struct { + f *plan9obj.File +} + +func (x *plan9objExe) DataStart() uint64 { + if s := x.f.Section("data"); s != nil { + return uint64(s.Offset) + } + return 0 +} + +func (x *plan9objExe) ReadData(addr, size uint64) ([]byte, error) { + for _, sect := range x.f.Sections { + if uint64(sect.Offset) <= addr && addr <= uint64(sect.Offset+sect.Size-1) { + n := uint64(sect.Offset+sect.Size) - addr + if n > size { + n = size + } + data := make([]byte, n) + _, err := sect.ReadAt(data, int64(addr-uint64(sect.Offset))) + if err != nil { + return nil, err + } + return data, nil + } + } + return nil, errors.New("address not mapped") + +} diff --git a/src/debug/buildinfo/buildinfo_test.go b/src/debug/buildinfo/buildinfo_test.go new file mode 100644 index 0000000..290e370 --- /dev/null +++ b/src/debug/buildinfo/buildinfo_test.go @@ -0,0 +1,329 @@ +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package buildinfo_test + +import ( + "bytes" + "debug/buildinfo" + "debug/pe" + "encoding/binary" + "flag" + "fmt" + "internal/testenv" + "os" + "os/exec" + "path" + "path/filepath" + "regexp" + "runtime" + "strings" + "testing" +) + +var flagAll = flag.Bool("all", false, "test all supported GOOS/GOARCH platforms, instead of only the current platform") + +// TestReadFile confirms that ReadFile can read build information from binaries +// on supported target platforms. It builds a trivial binary on the current +// platforms (or all platforms if -all is set) in various configurations and +// checks that build information can or cannot be read. +func TestReadFile(t *testing.T) { + if testing.Short() { + t.Skip("test requires compiling and linking, which may be slow") + } + testenv.MustHaveGoBuild(t) + + type platform struct{ goos, goarch string } + platforms := []platform{ + {"aix", "ppc64"}, + {"darwin", "amd64"}, + {"darwin", "arm64"}, + {"linux", "386"}, + {"linux", "amd64"}, + {"windows", "386"}, + {"windows", "amd64"}, + } + runtimePlatform := platform{runtime.GOOS, runtime.GOARCH} + haveRuntimePlatform := false + for _, p := range platforms { + if p == runtimePlatform { + haveRuntimePlatform = true + break + } + } + if !haveRuntimePlatform { + platforms = append(platforms, runtimePlatform) + } + + buildModes := []string{"pie", "exe"} + if testenv.HasCGO() { + buildModes = append(buildModes, "c-shared") + } + + // Keep in sync with src/cmd/go/internal/work/init.go:buildModeInit. + badmode := func(goos, goarch, buildmode string) string { + return fmt.Sprintf("-buildmode=%s not supported on %s/%s", buildmode, goos, goarch) + } + + buildWithModules := func(t *testing.T, goos, goarch, buildmode string) string { + dir := t.TempDir() + gomodPath := filepath.Join(dir, "go.mod") + gomodData := []byte("module example.com/m\ngo 1.18\n") + if err := os.WriteFile(gomodPath, gomodData, 0666); err != nil { + t.Fatal(err) + } + helloPath := filepath.Join(dir, "hello.go") + helloData := []byte("package main\nfunc main() {}\n") + if err := os.WriteFile(helloPath, helloData, 0666); err != nil { + t.Fatal(err) + } + outPath := filepath.Join(dir, path.Base(t.Name())) + cmd := exec.Command(testenv.GoToolPath(t), "build", "-o="+outPath, "-buildmode="+buildmode) + cmd.Dir = dir + cmd.Env = append(os.Environ(), "GO111MODULE=on", "GOOS="+goos, "GOARCH="+goarch) + stderr := &strings.Builder{} + cmd.Stderr = stderr + if err := cmd.Run(); err != nil { + if badmodeMsg := badmode(goos, goarch, buildmode); strings.Contains(stderr.String(), badmodeMsg) { + t.Skip(badmodeMsg) + } + t.Fatalf("failed building test file: %v\n%s", err, stderr.String()) + } + return outPath + } + + buildWithGOPATH := func(t *testing.T, goos, goarch, buildmode string) string { + gopathDir := t.TempDir() + pkgDir := filepath.Join(gopathDir, "src/example.com/m") + if err := os.MkdirAll(pkgDir, 0777); err != nil { + t.Fatal(err) + } + helloPath := filepath.Join(pkgDir, "hello.go") + helloData := []byte("package main\nfunc main() {}\n") + if err := os.WriteFile(helloPath, helloData, 0666); err != nil { + t.Fatal(err) + } + outPath := filepath.Join(gopathDir, path.Base(t.Name())) + cmd := exec.Command(testenv.GoToolPath(t), "build", "-o="+outPath, "-buildmode="+buildmode) + cmd.Dir = pkgDir + cmd.Env = append(os.Environ(), "GO111MODULE=off", "GOPATH="+gopathDir, "GOOS="+goos, "GOARCH="+goarch) + stderr := &strings.Builder{} + cmd.Stderr = stderr + if err := cmd.Run(); err != nil { + if badmodeMsg := badmode(goos, goarch, buildmode); strings.Contains(stderr.String(), badmodeMsg) { + t.Skip(badmodeMsg) + } + t.Fatalf("failed building test file: %v\n%s", err, stderr.String()) + } + return outPath + } + + damageBuildInfo := func(t *testing.T, name string) { + data, err := os.ReadFile(name) + if err != nil { + t.Fatal(err) + } + i := bytes.Index(data, []byte("\xff Go buildinf:")) + if i < 0 { + t.Fatal("Go buildinf not found") + } + data[i+2] = 'N' + if err := os.WriteFile(name, data, 0666); err != nil { + t.Fatal(err) + } + } + + goVersionRe := regexp.MustCompile("(?m)^go\t.*\n") + buildRe := regexp.MustCompile("(?m)^build\t.*\n") + cleanOutputForComparison := func(got string) string { + // Remove or replace anything that might depend on the test's environment + // so we can check the output afterward with a string comparison. + // We'll remove all build lines except the compiler, just to make sure + // build lines are included. + got = goVersionRe.ReplaceAllString(got, "go\tGOVERSION\n") + got = buildRe.ReplaceAllStringFunc(got, func(match string) string { + if strings.HasPrefix(match, "build\t-compiler=") { + return match + } + return "" + }) + return got + } + + cases := []struct { + name string + build func(t *testing.T, goos, goarch, buildmode string) string + want string + wantErr string + }{ + { + name: "doesnotexist", + build: func(t *testing.T, goos, goarch, buildmode string) string { + return "doesnotexist.txt" + }, + wantErr: "doesnotexist", + }, + { + name: "empty", + build: func(t *testing.T, _, _, _ string) string { + dir := t.TempDir() + name := filepath.Join(dir, "empty") + if err := os.WriteFile(name, nil, 0666); err != nil { + t.Fatal(err) + } + return name + }, + wantErr: "unrecognized file format", + }, + { + name: "valid_modules", + build: buildWithModules, + want: "go\tGOVERSION\n" + + "path\texample.com/m\n" + + "mod\texample.com/m\t(devel)\t\n" + + "build\t-compiler=gc\n", + }, + { + name: "invalid_modules", + build: func(t *testing.T, goos, goarch, buildmode string) string { + name := buildWithModules(t, goos, goarch, buildmode) + damageBuildInfo(t, name) + return name + }, + wantErr: "not a Go executable", + }, + { + name: "valid_gopath", + build: buildWithGOPATH, + want: "go\tGOVERSION\n" + + "path\texample.com/m\n" + + "build\t-compiler=gc\n", + }, + { + name: "invalid_gopath", + build: func(t *testing.T, goos, goarch, buildmode string) string { + name := buildWithGOPATH(t, goos, goarch, buildmode) + damageBuildInfo(t, name) + return name + }, + wantErr: "not a Go executable", + }, + } + + for _, p := range platforms { + p := p + t.Run(p.goos+"_"+p.goarch, func(t *testing.T) { + if p != runtimePlatform && !*flagAll { + t.Skipf("skipping platforms other than %s_%s because -all was not set", runtimePlatform.goos, runtimePlatform.goarch) + } + for _, mode := range buildModes { + mode := mode + t.Run(mode, func(t *testing.T) { + for _, tc := range cases { + tc := tc + t.Run(tc.name, func(t *testing.T) { + t.Parallel() + name := tc.build(t, p.goos, p.goarch, mode) + if info, err := buildinfo.ReadFile(name); err != nil { + if tc.wantErr == "" { + t.Fatalf("unexpected error: %v", err) + } else if errMsg := err.Error(); !strings.Contains(errMsg, tc.wantErr) { + t.Fatalf("got error %q; want error containing %q", errMsg, tc.wantErr) + } + } else { + if tc.wantErr != "" { + t.Fatalf("unexpected success; want error containing %q", tc.wantErr) + } + got := info.String() + if clean := cleanOutputForComparison(string(got)); got != tc.want && clean != tc.want { + t.Fatalf("got:\n%s\nwant:\n%s", got, tc.want) + } + } + }) + } + }) + } + }) + } +} + +// FuzzIssue57002 is a regression test for golang.org/issue/57002. +// +// The cause of issue 57002 is when pointerSize is not being checked, +// the read can panic with slice bounds out of range +func FuzzIssue57002(f *testing.F) { + // input from issue + f.Add([]byte{0x4d, 0x5a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x50, 0x45, 0x0, 0x0, 0x0, 0x0, 0x5, 0x0, 0x20, 0x20, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0x20, 0x3f, 0x0, 0x20, 0x0, 0x0, 0x20, 0x20, 0x20, 0x20, 0x20, 0xff, 0x20, 0x20, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xb, 0x20, 0x20, 0x20, 0xfc, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x9, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0, 0x20, 0x20, 0x20, 0x20, 0x20, 0xef, 0x20, 0xff, 0xbf, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf, 0x0, 0x2, 0x0, 0x20, 0x0, 0x0, 0x9, 0x0, 0x4, 0x0, 0x20, 0xf6, 0x0, 0xd3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0x1, 0x0, 0x0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0xa, 0x20, 0xa, 0x20, 0x20, 0x20, 0xff, 0x20, 0x20, 0xff, 0x20, 0x47, 0x6f, 0x20, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x69, 0x6e, 0x66, 0x3a, 0xde, 0xb5, 0xdf, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x6, 0x7f, 0x7f, 0x7f, 0x20, 0xf4, 0xb2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0xb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0x5, 0x0, 0x20, 0x20, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0x20, 0x3f, 0x27, 0x20, 0x0, 0xd, 0x0, 0xa, 0x20, 0x20, 0x20, 0x20, 0x20, 0xff, 0x20, 0x20, 0xff, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x0, 0x20, 0x20, 0x0, 0x0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x5c, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20}) + f.Fuzz(func(t *testing.T, input []byte) { + buildinfo.Read(bytes.NewReader(input)) + }) +} + +// TestIssue54968 is a regression test for golang.org/issue/54968. +// +// The cause of issue 54968 is when the first buildInfoMagic is invalid, it +// enters an infinite loop. +func TestIssue54968(t *testing.T) { + t.Parallel() + + const ( + paddingSize = 200 + buildInfoAlign = 16 + ) + buildInfoMagic := []byte("\xff Go buildinf:") + + // Construct a valid PE header. + var buf bytes.Buffer + + buf.Write([]byte{'M', 'Z'}) + buf.Write(bytes.Repeat([]byte{0}, 0x3c-2)) + // At location 0x3c, the stub has the file offset to the PE signature. + binary.Write(&buf, binary.LittleEndian, int32(0x3c+4)) + + buf.Write([]byte{'P', 'E', 0, 0}) + + binary.Write(&buf, binary.LittleEndian, pe.FileHeader{NumberOfSections: 1}) + + sh := pe.SectionHeader32{ + Name: [8]uint8{'t', 0}, + SizeOfRawData: uint32(paddingSize + len(buildInfoMagic)), + PointerToRawData: uint32(buf.Len()), + } + sh.PointerToRawData = uint32(buf.Len() + binary.Size(sh)) + + binary.Write(&buf, binary.LittleEndian, sh) + + start := buf.Len() + buf.Write(bytes.Repeat([]byte{0}, paddingSize+len(buildInfoMagic))) + data := buf.Bytes() + + if _, err := pe.NewFile(bytes.NewReader(data)); err != nil { + t.Fatalf("need a valid PE header for the misaligned buildInfoMagic test: %s", err) + } + + // Place buildInfoMagic after the header. + for i := 1; i < paddingSize-len(buildInfoMagic); i++ { + // Test only misaligned buildInfoMagic. + if i%buildInfoAlign == 0 { + continue + } + + t.Run(fmt.Sprintf("start_at_%d", i), func(t *testing.T) { + d := data[:start] + // Construct intentionally-misaligned buildInfoMagic. + d = append(d, bytes.Repeat([]byte{0}, i)...) + d = append(d, buildInfoMagic...) + d = append(d, bytes.Repeat([]byte{0}, paddingSize-i)...) + + _, err := buildinfo.Read(bytes.NewReader(d)) + + wantErr := "not a Go executable" + if err == nil { + t.Errorf("got error nil; want error containing %q", wantErr) + } else if errMsg := err.Error(); !strings.Contains(errMsg, wantErr) { + t.Errorf("got error %q; want error containing %q", errMsg, wantErr) + } + }) + } +} diff --git a/src/debug/dwarf/attr_string.go b/src/debug/dwarf/attr_string.go new file mode 100644 index 0000000..8a4fff8 --- /dev/null +++ b/src/debug/dwarf/attr_string.go @@ -0,0 +1,265 @@ +// Code generated by "stringer -type Attr -trimprefix=Attr"; DO NOT EDIT. + +package dwarf + +import "strconv" + +func _() { + // An "invalid array index" compiler error signifies that the constant values have changed. + // Re-run the stringer command to generate them again. + var x [1]struct{} + _ = x[AttrSibling-1] + _ = x[AttrLocation-2] + _ = x[AttrName-3] + _ = x[AttrOrdering-9] + _ = x[AttrByteSize-11] + _ = x[AttrBitOffset-12] + _ = x[AttrBitSize-13] + _ = x[AttrStmtList-16] + _ = x[AttrLowpc-17] + _ = x[AttrHighpc-18] + _ = x[AttrLanguage-19] + _ = x[AttrDiscr-21] + _ = x[AttrDiscrValue-22] + _ = x[AttrVisibility-23] + _ = x[AttrImport-24] + _ = x[AttrStringLength-25] + _ = x[AttrCommonRef-26] + _ = x[AttrCompDir-27] + _ = x[AttrConstValue-28] + _ = x[AttrContainingType-29] + _ = x[AttrDefaultValue-30] + _ = x[AttrInline-32] + _ = x[AttrIsOptional-33] + _ = x[AttrLowerBound-34] + _ = x[AttrProducer-37] + _ = x[AttrPrototyped-39] + _ = x[AttrReturnAddr-42] + _ = x[AttrStartScope-44] + _ = x[AttrStrideSize-46] + _ = x[AttrUpperBound-47] + _ = x[AttrAbstractOrigin-49] + _ = x[AttrAccessibility-50] + _ = x[AttrAddrClass-51] + _ = x[AttrArtificial-52] + _ = x[AttrBaseTypes-53] + _ = x[AttrCalling-54] + _ = x[AttrCount-55] + _ = x[AttrDataMemberLoc-56] + _ = x[AttrDeclColumn-57] + _ = x[AttrDeclFile-58] + _ = x[AttrDeclLine-59] + _ = x[AttrDeclaration-60] + _ = x[AttrDiscrList-61] + _ = x[AttrEncoding-62] + _ = x[AttrExternal-63] + _ = x[AttrFrameBase-64] + _ = x[AttrFriend-65] + _ = x[AttrIdentifierCase-66] + _ = x[AttrMacroInfo-67] + _ = x[AttrNamelistItem-68] + _ = x[AttrPriority-69] + _ = x[AttrSegment-70] + _ = x[AttrSpecification-71] + _ = x[AttrStaticLink-72] + _ = x[AttrType-73] + _ = x[AttrUseLocation-74] + _ = x[AttrVarParam-75] + _ = x[AttrVirtuality-76] + _ = x[AttrVtableElemLoc-77] + _ = x[AttrAllocated-78] + _ = x[AttrAssociated-79] + _ = x[AttrDataLocation-80] + _ = x[AttrStride-81] + _ = x[AttrEntrypc-82] + _ = x[AttrUseUTF8-83] + _ = x[AttrExtension-84] + _ = x[AttrRanges-85] + _ = x[AttrTrampoline-86] + _ = x[AttrCallColumn-87] + _ = x[AttrCallFile-88] + _ = x[AttrCallLine-89] + _ = x[AttrDescription-90] + _ = x[AttrBinaryScale-91] + _ = x[AttrDecimalScale-92] + _ = x[AttrSmall-93] + _ = x[AttrDecimalSign-94] + _ = x[AttrDigitCount-95] + _ = x[AttrPictureString-96] + _ = x[AttrMutable-97] + _ = x[AttrThreadsScaled-98] + _ = x[AttrExplicit-99] + _ = x[AttrObjectPointer-100] + _ = x[AttrEndianity-101] + _ = x[AttrElemental-102] + _ = x[AttrPure-103] + _ = x[AttrRecursive-104] + _ = x[AttrSignature-105] + _ = x[AttrMainSubprogram-106] + _ = x[AttrDataBitOffset-107] + _ = x[AttrConstExpr-108] + _ = x[AttrEnumClass-109] + _ = x[AttrLinkageName-110] + _ = x[AttrStringLengthBitSize-111] + _ = x[AttrStringLengthByteSize-112] + _ = x[AttrRank-113] + _ = x[AttrStrOffsetsBase-114] + _ = x[AttrAddrBase-115] + _ = x[AttrRnglistsBase-116] + _ = x[AttrDwoName-118] + _ = x[AttrReference-119] + _ = x[AttrRvalueReference-120] + _ = x[AttrMacros-121] + _ = x[AttrCallAllCalls-122] + _ = x[AttrCallAllSourceCalls-123] + _ = x[AttrCallAllTailCalls-124] + _ = x[AttrCallReturnPC-125] + _ = x[AttrCallValue-126] + _ = x[AttrCallOrigin-127] + _ = x[AttrCallParameter-128] + _ = x[AttrCallPC-129] + _ = x[AttrCallTailCall-130] + _ = x[AttrCallTarget-131] + _ = x[AttrCallTargetClobbered-132] + _ = x[AttrCallDataLocation-133] + _ = x[AttrCallDataValue-134] + _ = x[AttrNoreturn-135] + _ = x[AttrAlignment-136] + _ = x[AttrExportSymbols-137] + _ = x[AttrDeleted-138] + _ = x[AttrDefaulted-139] + _ = x[AttrLoclistsBase-140] +} + +const _Attr_name = "SiblingLocationNameOrderingByteSizeBitOffsetBitSizeStmtListLowpcHighpcLanguageDiscrDiscrValueVisibilityImportStringLengthCommonRefCompDirConstValueContainingTypeDefaultValueInlineIsOptionalLowerBoundProducerPrototypedReturnAddrStartScopeStrideSizeUpperBoundAbstractOriginAccessibilityAddrClassArtificialBaseTypesCallingCountDataMemberLocDeclColumnDeclFileDeclLineDeclarationDiscrListEncodingExternalFrameBaseFriendIdentifierCaseMacroInfoNamelistItemPrioritySegmentSpecificationStaticLinkTypeUseLocationVarParamVirtualityVtableElemLocAllocatedAssociatedDataLocationStrideEntrypcUseUTF8ExtensionRangesTrampolineCallColumnCallFileCallLineDescriptionBinaryScaleDecimalScaleSmallDecimalSignDigitCountPictureStringMutableThreadsScaledExplicitObjectPointerEndianityElementalPureRecursiveSignatureMainSubprogramDataBitOffsetConstExprEnumClassLinkageNameStringLengthBitSizeStringLengthByteSizeRankStrOffsetsBaseAddrBaseRnglistsBaseDwoNameReferenceRvalueReferenceMacrosCallAllCallsCallAllSourceCallsCallAllTailCallsCallReturnPCCallValueCallOriginCallParameterCallPCCallTailCallCallTargetCallTargetClobberedCallDataLocationCallDataValueNoreturnAlignmentExportSymbolsDeletedDefaultedLoclistsBase" + +var _Attr_map = map[Attr]string{ + 1: _Attr_name[0:7], + 2: _Attr_name[7:15], + 3: _Attr_name[15:19], + 9: _Attr_name[19:27], + 11: _Attr_name[27:35], + 12: _Attr_name[35:44], + 13: _Attr_name[44:51], + 16: _Attr_name[51:59], + 17: _Attr_name[59:64], + 18: _Attr_name[64:70], + 19: _Attr_name[70:78], + 21: _Attr_name[78:83], + 22: _Attr_name[83:93], + 23: _Attr_name[93:103], + 24: _Attr_name[103:109], + 25: _Attr_name[109:121], + 26: _Attr_name[121:130], + 27: _Attr_name[130:137], + 28: _Attr_name[137:147], + 29: _Attr_name[147:161], + 30: _Attr_name[161:173], + 32: _Attr_name[173:179], + 33: _Attr_name[179:189], + 34: _Attr_name[189:199], + 37: _Attr_name[199:207], + 39: _Attr_name[207:217], + 42: _Attr_name[217:227], + 44: _Attr_name[227:237], + 46: _Attr_name[237:247], + 47: _Attr_name[247:257], + 49: _Attr_name[257:271], + 50: _Attr_name[271:284], + 51: _Attr_name[284:293], + 52: _Attr_name[293:303], + 53: _Attr_name[303:312], + 54: _Attr_name[312:319], + 55: _Attr_name[319:324], + 56: _Attr_name[324:337], + 57: _Attr_name[337:347], + 58: _Attr_name[347:355], + 59: _Attr_name[355:363], + 60: _Attr_name[363:374], + 61: _Attr_name[374:383], + 62: _Attr_name[383:391], + 63: _Attr_name[391:399], + 64: _Attr_name[399:408], + 65: _Attr_name[408:414], + 66: _Attr_name[414:428], + 67: _Attr_name[428:437], + 68: _Attr_name[437:449], + 69: _Attr_name[449:457], + 70: _Attr_name[457:464], + 71: _Attr_name[464:477], + 72: _Attr_name[477:487], + 73: _Attr_name[487:491], + 74: _Attr_name[491:502], + 75: _Attr_name[502:510], + 76: _Attr_name[510:520], + 77: _Attr_name[520:533], + 78: _Attr_name[533:542], + 79: _Attr_name[542:552], + 80: _Attr_name[552:564], + 81: _Attr_name[564:570], + 82: _Attr_name[570:577], + 83: _Attr_name[577:584], + 84: _Attr_name[584:593], + 85: _Attr_name[593:599], + 86: _Attr_name[599:609], + 87: _Attr_name[609:619], + 88: _Attr_name[619:627], + 89: _Attr_name[627:635], + 90: _Attr_name[635:646], + 91: _Attr_name[646:657], + 92: _Attr_name[657:669], + 93: _Attr_name[669:674], + 94: _Attr_name[674:685], + 95: _Attr_name[685:695], + 96: _Attr_name[695:708], + 97: _Attr_name[708:715], + 98: _Attr_name[715:728], + 99: _Attr_name[728:736], + 100: _Attr_name[736:749], + 101: _Attr_name[749:758], + 102: _Attr_name[758:767], + 103: _Attr_name[767:771], + 104: _Attr_name[771:780], + 105: _Attr_name[780:789], + 106: _Attr_name[789:803], + 107: _Attr_name[803:816], + 108: _Attr_name[816:825], + 109: _Attr_name[825:834], + 110: _Attr_name[834:845], + 111: _Attr_name[845:864], + 112: _Attr_name[864:884], + 113: _Attr_name[884:888], + 114: _Attr_name[888:902], + 115: _Attr_name[902:910], + 116: _Attr_name[910:922], + 118: _Attr_name[922:929], + 119: _Attr_name[929:938], + 120: _Attr_name[938:953], + 121: _Attr_name[953:959], + 122: _Attr_name[959:971], + 123: _Attr_name[971:989], + 124: _Attr_name[989:1005], + 125: _Attr_name[1005:1017], + 126: _Attr_name[1017:1026], + 127: _Attr_name[1026:1036], + 128: _Attr_name[1036:1049], + 129: _Attr_name[1049:1055], + 130: _Attr_name[1055:1067], + 131: _Attr_name[1067:1077], + 132: _Attr_name[1077:1096], + 133: _Attr_name[1096:1112], + 134: _Attr_name[1112:1125], + 135: _Attr_name[1125:1133], + 136: _Attr_name[1133:1142], + 137: _Attr_name[1142:1155], + 138: _Attr_name[1155:1162], + 139: _Attr_name[1162:1171], + 140: _Attr_name[1171:1183], +} + +func (i Attr) String() string { + if str, ok := _Attr_map[i]; ok { + return str + } + return "Attr(" + strconv.FormatInt(int64(i), 10) + ")" +} diff --git a/src/debug/dwarf/buf.go b/src/debug/dwarf/buf.go new file mode 100644 index 0000000..7ac53ef --- /dev/null +++ b/src/debug/dwarf/buf.go @@ -0,0 +1,205 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Buffered reading and decoding of DWARF data streams. + +package dwarf + +import ( + "bytes" + "encoding/binary" + "strconv" +) + +// Data buffer being decoded. +type buf struct { + dwarf *Data + order binary.ByteOrder + format dataFormat + name string + off Offset + data []byte + err error +} + +// Data format, other than byte order. This affects the handling of +// certain field formats. +type dataFormat interface { + // DWARF version number. Zero means unknown. + version() int + + // 64-bit DWARF format? + dwarf64() (dwarf64 bool, isKnown bool) + + // Size of an address, in bytes. Zero means unknown. + addrsize() int +} + +// Some parts of DWARF have no data format, e.g., abbrevs. +type unknownFormat struct{} + +func (u unknownFormat) version() int { + return 0 +} + +func (u unknownFormat) dwarf64() (bool, bool) { + return false, false +} + +func (u unknownFormat) addrsize() int { + return 0 +} + +func makeBuf(d *Data, format dataFormat, name string, off Offset, data []byte) buf { + return buf{d, d.order, format, name, off, data, nil} +} + +func (b *buf) uint8() uint8 { + if len(b.data) < 1 { + b.error("underflow") + return 0 + } + val := b.data[0] + b.data = b.data[1:] + b.off++ + return val +} + +func (b *buf) bytes(n int) []byte { + if n < 0 || len(b.data) < n { + b.error("underflow") + return nil + } + data := b.data[0:n] + b.data = b.data[n:] + b.off += Offset(n) + return data +} + +func (b *buf) skip(n int) { b.bytes(n) } + +func (b *buf) string() string { + i := bytes.IndexByte(b.data, 0) + if i < 0 { + b.error("underflow") + return "" + } + + s := string(b.data[0:i]) + b.data = b.data[i+1:] + b.off += Offset(i + 1) + return s +} + +func (b *buf) uint16() uint16 { + a := b.bytes(2) + if a == nil { + return 0 + } + return b.order.Uint16(a) +} + +func (b *buf) uint24() uint32 { + a := b.bytes(3) + if a == nil { + return 0 + } + if b.dwarf.bigEndian { + return uint32(a[2]) | uint32(a[1])<<8 | uint32(a[0])<<16 + } else { + return uint32(a[0]) | uint32(a[1])<<8 | uint32(a[2])<<16 + } +} + +func (b *buf) uint32() uint32 { + a := b.bytes(4) + if a == nil { + return 0 + } + return b.order.Uint32(a) +} + +func (b *buf) uint64() uint64 { + a := b.bytes(8) + if a == nil { + return 0 + } + return b.order.Uint64(a) +} + +// Read a varint, which is 7 bits per byte, little endian. +// the 0x80 bit means read another byte. +func (b *buf) varint() (c uint64, bits uint) { + for i := 0; i < len(b.data); i++ { + byte := b.data[i] + c |= uint64(byte&0x7F) << bits + bits += 7 + if byte&0x80 == 0 { + b.off += Offset(i + 1) + b.data = b.data[i+1:] + return c, bits + } + } + return 0, 0 +} + +// Unsigned int is just a varint. +func (b *buf) uint() uint64 { + x, _ := b.varint() + return x +} + +// Signed int is a sign-extended varint. +func (b *buf) int() int64 { + ux, bits := b.varint() + x := int64(ux) + if x&(1<<(bits-1)) != 0 { + x |= -1 << bits + } + return x +} + +// Address-sized uint. +func (b *buf) addr() uint64 { + switch b.format.addrsize() { + case 1: + return uint64(b.uint8()) + case 2: + return uint64(b.uint16()) + case 4: + return uint64(b.uint32()) + case 8: + return b.uint64() + } + b.error("unknown address size") + return 0 +} + +func (b *buf) unitLength() (length Offset, dwarf64 bool) { + length = Offset(b.uint32()) + if length == 0xffffffff { + dwarf64 = true + length = Offset(b.uint64()) + } else if length >= 0xfffffff0 { + b.error("unit length has reserved value") + } + return +} + +func (b *buf) error(s string) { + if b.err == nil { + b.data = nil + b.err = DecodeError{b.name, b.off, s} + } +} + +type DecodeError struct { + Name string + Offset Offset + Err string +} + +func (e DecodeError) Error() string { + return "decoding dwarf section " + e.Name + " at offset 0x" + strconv.FormatInt(int64(e.Offset), 16) + ": " + e.Err +} diff --git a/src/debug/dwarf/class_string.go b/src/debug/dwarf/class_string.go new file mode 100644 index 0000000..76de7ca --- /dev/null +++ b/src/debug/dwarf/class_string.go @@ -0,0 +1,37 @@ +// Code generated by "stringer -type=Class"; DO NOT EDIT. + +package dwarf + +import "strconv" + +func _() { + // An "invalid array index" compiler error signifies that the constant values have changed. + // Re-run the stringer command to generate them again. + var x [1]struct{} + _ = x[ClassUnknown-0] + _ = x[ClassAddress-1] + _ = x[ClassBlock-2] + _ = x[ClassConstant-3] + _ = x[ClassExprLoc-4] + _ = x[ClassFlag-5] + _ = x[ClassLinePtr-6] + _ = x[ClassLocListPtr-7] + _ = x[ClassMacPtr-8] + _ = x[ClassRangeListPtr-9] + _ = x[ClassReference-10] + _ = x[ClassReferenceSig-11] + _ = x[ClassString-12] + _ = x[ClassReferenceAlt-13] + _ = x[ClassStringAlt-14] +} + +const _Class_name = "ClassUnknownClassAddressClassBlockClassConstantClassExprLocClassFlagClassLinePtrClassLocListPtrClassMacPtrClassRangeListPtrClassReferenceClassReferenceSigClassStringClassReferenceAltClassStringAlt" + +var _Class_index = [...]uint8{0, 12, 24, 34, 47, 59, 68, 80, 95, 106, 123, 137, 154, 165, 182, 196} + +func (i Class) String() string { + if i < 0 || i >= Class(len(_Class_index)-1) { + return "Class(" + strconv.FormatInt(int64(i), 10) + ")" + } + return _Class_name[_Class_index[i]:_Class_index[i+1]] +} diff --git a/src/debug/dwarf/const.go b/src/debug/dwarf/const.go new file mode 100644 index 0000000..c0a74b0 --- /dev/null +++ b/src/debug/dwarf/const.go @@ -0,0 +1,475 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Constants + +package dwarf + +//go:generate stringer -type Attr -trimprefix=Attr + +// An Attr identifies the attribute type in a DWARF Entry's Field. +type Attr uint32 + +const ( + AttrSibling Attr = 0x01 + AttrLocation Attr = 0x02 + AttrName Attr = 0x03 + AttrOrdering Attr = 0x09 + AttrByteSize Attr = 0x0B + AttrBitOffset Attr = 0x0C + AttrBitSize Attr = 0x0D + AttrStmtList Attr = 0x10 + AttrLowpc Attr = 0x11 + AttrHighpc Attr = 0x12 + AttrLanguage Attr = 0x13 + AttrDiscr Attr = 0x15 + AttrDiscrValue Attr = 0x16 + AttrVisibility Attr = 0x17 + AttrImport Attr = 0x18 + AttrStringLength Attr = 0x19 + AttrCommonRef Attr = 0x1A + AttrCompDir Attr = 0x1B + AttrConstValue Attr = 0x1C + AttrContainingType Attr = 0x1D + AttrDefaultValue Attr = 0x1E + AttrInline Attr = 0x20 + AttrIsOptional Attr = 0x21 + AttrLowerBound Attr = 0x22 + AttrProducer Attr = 0x25 + AttrPrototyped Attr = 0x27 + AttrReturnAddr Attr = 0x2A + AttrStartScope Attr = 0x2C + AttrStrideSize Attr = 0x2E + AttrUpperBound Attr = 0x2F + AttrAbstractOrigin Attr = 0x31 + AttrAccessibility Attr = 0x32 + AttrAddrClass Attr = 0x33 + AttrArtificial Attr = 0x34 + AttrBaseTypes Attr = 0x35 + AttrCalling Attr = 0x36 + AttrCount Attr = 0x37 + AttrDataMemberLoc Attr = 0x38 + AttrDeclColumn Attr = 0x39 + AttrDeclFile Attr = 0x3A + AttrDeclLine Attr = 0x3B + AttrDeclaration Attr = 0x3C + AttrDiscrList Attr = 0x3D + AttrEncoding Attr = 0x3E + AttrExternal Attr = 0x3F + AttrFrameBase Attr = 0x40 + AttrFriend Attr = 0x41 + AttrIdentifierCase Attr = 0x42 + AttrMacroInfo Attr = 0x43 + AttrNamelistItem Attr = 0x44 + AttrPriority Attr = 0x45 + AttrSegment Attr = 0x46 + AttrSpecification Attr = 0x47 + AttrStaticLink Attr = 0x48 + AttrType Attr = 0x49 + AttrUseLocation Attr = 0x4A + AttrVarParam Attr = 0x4B + AttrVirtuality Attr = 0x4C + AttrVtableElemLoc Attr = 0x4D + // The following are new in DWARF 3. + AttrAllocated Attr = 0x4E + AttrAssociated Attr = 0x4F + AttrDataLocation Attr = 0x50 + AttrStride Attr = 0x51 + AttrEntrypc Attr = 0x52 + AttrUseUTF8 Attr = 0x53 + AttrExtension Attr = 0x54 + AttrRanges Attr = 0x55 + AttrTrampoline Attr = 0x56 + AttrCallColumn Attr = 0x57 + AttrCallFile Attr = 0x58 + AttrCallLine Attr = 0x59 + AttrDescription Attr = 0x5A + AttrBinaryScale Attr = 0x5B + AttrDecimalScale Attr = 0x5C + AttrSmall Attr = 0x5D + AttrDecimalSign Attr = 0x5E + AttrDigitCount Attr = 0x5F + AttrPictureString Attr = 0x60 + AttrMutable Attr = 0x61 + AttrThreadsScaled Attr = 0x62 + AttrExplicit Attr = 0x63 + AttrObjectPointer Attr = 0x64 + AttrEndianity Attr = 0x65 + AttrElemental Attr = 0x66 + AttrPure Attr = 0x67 + AttrRecursive Attr = 0x68 + // The following are new in DWARF 4. + AttrSignature Attr = 0x69 + AttrMainSubprogram Attr = 0x6A + AttrDataBitOffset Attr = 0x6B + AttrConstExpr Attr = 0x6C + AttrEnumClass Attr = 0x6D + AttrLinkageName Attr = 0x6E + // The following are new in DWARF 5. + AttrStringLengthBitSize Attr = 0x6F + AttrStringLengthByteSize Attr = 0x70 + AttrRank Attr = 0x71 + AttrStrOffsetsBase Attr = 0x72 + AttrAddrBase Attr = 0x73 + AttrRnglistsBase Attr = 0x74 + AttrDwoName Attr = 0x76 + AttrReference Attr = 0x77 + AttrRvalueReference Attr = 0x78 + AttrMacros Attr = 0x79 + AttrCallAllCalls Attr = 0x7A + AttrCallAllSourceCalls Attr = 0x7B + AttrCallAllTailCalls Attr = 0x7C + AttrCallReturnPC Attr = 0x7D + AttrCallValue Attr = 0x7E + AttrCallOrigin Attr = 0x7F + AttrCallParameter Attr = 0x80 + AttrCallPC Attr = 0x81 + AttrCallTailCall Attr = 0x82 + AttrCallTarget Attr = 0x83 + AttrCallTargetClobbered Attr = 0x84 + AttrCallDataLocation Attr = 0x85 + AttrCallDataValue Attr = 0x86 + AttrNoreturn Attr = 0x87 + AttrAlignment Attr = 0x88 + AttrExportSymbols Attr = 0x89 + AttrDeleted Attr = 0x8A + AttrDefaulted Attr = 0x8B + AttrLoclistsBase Attr = 0x8C +) + +func (a Attr) GoString() string { + if str, ok := _Attr_map[a]; ok { + return "dwarf.Attr" + str + } + return "dwarf." + a.String() +} + +// A format is a DWARF data encoding format. +type format uint32 + +const ( + // value formats + formAddr format = 0x01 + formDwarfBlock2 format = 0x03 + formDwarfBlock4 format = 0x04 + formData2 format = 0x05 + formData4 format = 0x06 + formData8 format = 0x07 + formString format = 0x08 + formDwarfBlock format = 0x09 + formDwarfBlock1 format = 0x0A + formData1 format = 0x0B + formFlag format = 0x0C + formSdata format = 0x0D + formStrp format = 0x0E + formUdata format = 0x0F + formRefAddr format = 0x10 + formRef1 format = 0x11 + formRef2 format = 0x12 + formRef4 format = 0x13 + formRef8 format = 0x14 + formRefUdata format = 0x15 + formIndirect format = 0x16 + // The following are new in DWARF 4. + formSecOffset format = 0x17 + formExprloc format = 0x18 + formFlagPresent format = 0x19 + formRefSig8 format = 0x20 + // The following are new in DWARF 5. + formStrx format = 0x1A + formAddrx format = 0x1B + formRefSup4 format = 0x1C + formStrpSup format = 0x1D + formData16 format = 0x1E + formLineStrp format = 0x1F + formImplicitConst format = 0x21 + formLoclistx format = 0x22 + formRnglistx format = 0x23 + formRefSup8 format = 0x24 + formStrx1 format = 0x25 + formStrx2 format = 0x26 + formStrx3 format = 0x27 + formStrx4 format = 0x28 + formAddrx1 format = 0x29 + formAddrx2 format = 0x2A + formAddrx3 format = 0x2B + formAddrx4 format = 0x2C + // Extensions for multi-file compression (.dwz) + // http://www.dwarfstd.org/ShowIssue.php?issue=120604.1 + formGnuRefAlt format = 0x1f20 + formGnuStrpAlt format = 0x1f21 +) + +//go:generate stringer -type Tag -trimprefix=Tag + +// A Tag is the classification (the type) of an Entry. +type Tag uint32 + +const ( + TagArrayType Tag = 0x01 + TagClassType Tag = 0x02 + TagEntryPoint Tag = 0x03 + TagEnumerationType Tag = 0x04 + TagFormalParameter Tag = 0x05 + TagImportedDeclaration Tag = 0x08 + TagLabel Tag = 0x0A + TagLexDwarfBlock Tag = 0x0B + TagMember Tag = 0x0D + TagPointerType Tag = 0x0F + TagReferenceType Tag = 0x10 + TagCompileUnit Tag = 0x11 + TagStringType Tag = 0x12 + TagStructType Tag = 0x13 + TagSubroutineType Tag = 0x15 + TagTypedef Tag = 0x16 + TagUnionType Tag = 0x17 + TagUnspecifiedParameters Tag = 0x18 + TagVariant Tag = 0x19 + TagCommonDwarfBlock Tag = 0x1A + TagCommonInclusion Tag = 0x1B + TagInheritance Tag = 0x1C + TagInlinedSubroutine Tag = 0x1D + TagModule Tag = 0x1E + TagPtrToMemberType Tag = 0x1F + TagSetType Tag = 0x20 + TagSubrangeType Tag = 0x21 + TagWithStmt Tag = 0x22 + TagAccessDeclaration Tag = 0x23 + TagBaseType Tag = 0x24 + TagCatchDwarfBlock Tag = 0x25 + TagConstType Tag = 0x26 + TagConstant Tag = 0x27 + TagEnumerator Tag = 0x28 + TagFileType Tag = 0x29 + TagFriend Tag = 0x2A + TagNamelist Tag = 0x2B + TagNamelistItem Tag = 0x2C + TagPackedType Tag = 0x2D + TagSubprogram Tag = 0x2E + TagTemplateTypeParameter Tag = 0x2F + TagTemplateValueParameter Tag = 0x30 + TagThrownType Tag = 0x31 + TagTryDwarfBlock Tag = 0x32 + TagVariantPart Tag = 0x33 + TagVariable Tag = 0x34 + TagVolatileType Tag = 0x35 + // The following are new in DWARF 3. + TagDwarfProcedure Tag = 0x36 + TagRestrictType Tag = 0x37 + TagInterfaceType Tag = 0x38 + TagNamespace Tag = 0x39 + TagImportedModule Tag = 0x3A + TagUnspecifiedType Tag = 0x3B + TagPartialUnit Tag = 0x3C + TagImportedUnit Tag = 0x3D + TagMutableType Tag = 0x3E // Later removed from DWARF. + TagCondition Tag = 0x3F + TagSharedType Tag = 0x40 + // The following are new in DWARF 4. + TagTypeUnit Tag = 0x41 + TagRvalueReferenceType Tag = 0x42 + TagTemplateAlias Tag = 0x43 + // The following are new in DWARF 5. + TagCoarrayType Tag = 0x44 + TagGenericSubrange Tag = 0x45 + TagDynamicType Tag = 0x46 + TagAtomicType Tag = 0x47 + TagCallSite Tag = 0x48 + TagCallSiteParameter Tag = 0x49 + TagSkeletonUnit Tag = 0x4A + TagImmutableType Tag = 0x4B +) + +func (t Tag) GoString() string { + if t <= TagTemplateAlias { + return "dwarf.Tag" + t.String() + } + return "dwarf." + t.String() +} + +// Location expression operators. +// The debug info encodes value locations like 8(R3) +// as a sequence of these op codes. +// This package does not implement full expressions; +// the opPlusUconst operator is expected by the type parser. +const ( + opAddr = 0x03 /* 1 op, const addr */ + opDeref = 0x06 + opConst1u = 0x08 /* 1 op, 1 byte const */ + opConst1s = 0x09 /* " signed */ + opConst2u = 0x0A /* 1 op, 2 byte const */ + opConst2s = 0x0B /* " signed */ + opConst4u = 0x0C /* 1 op, 4 byte const */ + opConst4s = 0x0D /* " signed */ + opConst8u = 0x0E /* 1 op, 8 byte const */ + opConst8s = 0x0F /* " signed */ + opConstu = 0x10 /* 1 op, LEB128 const */ + opConsts = 0x11 /* " signed */ + opDup = 0x12 + opDrop = 0x13 + opOver = 0x14 + opPick = 0x15 /* 1 op, 1 byte stack index */ + opSwap = 0x16 + opRot = 0x17 + opXderef = 0x18 + opAbs = 0x19 + opAnd = 0x1A + opDiv = 0x1B + opMinus = 0x1C + opMod = 0x1D + opMul = 0x1E + opNeg = 0x1F + opNot = 0x20 + opOr = 0x21 + opPlus = 0x22 + opPlusUconst = 0x23 /* 1 op, ULEB128 addend */ + opShl = 0x24 + opShr = 0x25 + opShra = 0x26 + opXor = 0x27 + opSkip = 0x2F /* 1 op, signed 2-byte constant */ + opBra = 0x28 /* 1 op, signed 2-byte constant */ + opEq = 0x29 + opGe = 0x2A + opGt = 0x2B + opLe = 0x2C + opLt = 0x2D + opNe = 0x2E + opLit0 = 0x30 + /* OpLitN = OpLit0 + N for N = 0..31 */ + opReg0 = 0x50 + /* OpRegN = OpReg0 + N for N = 0..31 */ + opBreg0 = 0x70 /* 1 op, signed LEB128 constant */ + /* OpBregN = OpBreg0 + N for N = 0..31 */ + opRegx = 0x90 /* 1 op, ULEB128 register */ + opFbreg = 0x91 /* 1 op, SLEB128 offset */ + opBregx = 0x92 /* 2 op, ULEB128 reg; SLEB128 off */ + opPiece = 0x93 /* 1 op, ULEB128 size of piece */ + opDerefSize = 0x94 /* 1-byte size of data retrieved */ + opXderefSize = 0x95 /* 1-byte size of data retrieved */ + opNop = 0x96 + // The following are new in DWARF 3. + opPushObjAddr = 0x97 + opCall2 = 0x98 /* 2-byte offset of DIE */ + opCall4 = 0x99 /* 4-byte offset of DIE */ + opCallRef = 0x9A /* 4- or 8- byte offset of DIE */ + opFormTLSAddress = 0x9B + opCallFrameCFA = 0x9C + opBitPiece = 0x9D + // The following are new in DWARF 4. + opImplicitValue = 0x9E + opStackValue = 0x9F + // The following a new in DWARF 5. + opImplicitPointer = 0xA0 + opAddrx = 0xA1 + opConstx = 0xA2 + opEntryValue = 0xA3 + opConstType = 0xA4 + opRegvalType = 0xA5 + opDerefType = 0xA6 + opXderefType = 0xA7 + opConvert = 0xA8 + opReinterpret = 0xA9 + /* 0xE0-0xFF reserved for user-specific */ +) + +// Basic type encodings -- the value for AttrEncoding in a TagBaseType Entry. +const ( + encAddress = 0x01 + encBoolean = 0x02 + encComplexFloat = 0x03 + encFloat = 0x04 + encSigned = 0x05 + encSignedChar = 0x06 + encUnsigned = 0x07 + encUnsignedChar = 0x08 + // The following are new in DWARF 3. + encImaginaryFloat = 0x09 + encPackedDecimal = 0x0A + encNumericString = 0x0B + encEdited = 0x0C + encSignedFixed = 0x0D + encUnsignedFixed = 0x0E + encDecimalFloat = 0x0F + // The following are new in DWARF 4. + encUTF = 0x10 + // The following are new in DWARF 5. + encUCS = 0x11 + encASCII = 0x12 +) + +// Statement program standard opcode encodings. +const ( + lnsCopy = 1 + lnsAdvancePC = 2 + lnsAdvanceLine = 3 + lnsSetFile = 4 + lnsSetColumn = 5 + lnsNegateStmt = 6 + lnsSetBasicBlock = 7 + lnsConstAddPC = 8 + lnsFixedAdvancePC = 9 + + // DWARF 3 + lnsSetPrologueEnd = 10 + lnsSetEpilogueBegin = 11 + lnsSetISA = 12 +) + +// Statement program extended opcode encodings. +const ( + lneEndSequence = 1 + lneSetAddress = 2 + lneDefineFile = 3 + + // DWARF 4 + lneSetDiscriminator = 4 +) + +// Line table directory and file name entry formats. +// These are new in DWARF 5. +const ( + lnctPath = 0x01 + lnctDirectoryIndex = 0x02 + lnctTimestamp = 0x03 + lnctSize = 0x04 + lnctMD5 = 0x05 +) + +// Location list entry codes. +// These are new in DWARF 5. +const ( + lleEndOfList = 0x00 + lleBaseAddressx = 0x01 + lleStartxEndx = 0x02 + lleStartxLength = 0x03 + lleOffsetPair = 0x04 + lleDefaultLocation = 0x05 + lleBaseAddress = 0x06 + lleStartEnd = 0x07 + lleStartLength = 0x08 +) + +// Unit header unit type encodings. +// These are new in DWARF 5. +const ( + utCompile = 0x01 + utType = 0x02 + utPartial = 0x03 + utSkeleton = 0x04 + utSplitCompile = 0x05 + utSplitType = 0x06 +) + +// Opcodes for DWARFv5 debug_rnglists section. +const ( + rleEndOfList = 0x0 + rleBaseAddressx = 0x1 + rleStartxEndx = 0x2 + rleStartxLength = 0x3 + rleOffsetPair = 0x4 + rleBaseAddress = 0x5 + rleStartEnd = 0x6 + rleStartLength = 0x7 +) diff --git a/src/debug/dwarf/dwarf5ranges_test.go b/src/debug/dwarf/dwarf5ranges_test.go new file mode 100644 index 0000000..8bc50bc --- /dev/null +++ b/src/debug/dwarf/dwarf5ranges_test.go @@ -0,0 +1,41 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf + +import ( + "encoding/binary" + "os" + "reflect" + "testing" +) + +func TestDwarf5Ranges(t *testing.T) { + rngLists, err := os.ReadFile("testdata/debug_rnglists") + if err != nil { + t.Fatalf("could not read test data: %v", err) + } + + d := &Data{} + d.order = binary.LittleEndian + if err := d.AddSection(".debug_rnglists", rngLists); err != nil { + t.Fatal(err) + } + u := &unit{ + asize: 8, + vers: 5, + is64: true, + } + ret, err := d.dwarf5Ranges(u, nil, 0x5fbd, 0xc, [][2]uint64{}) + if err != nil { + t.Fatalf("could not read rnglist: %v", err) + } + t.Logf("%#v", ret) + + tgt := [][2]uint64{{0x0000000000006712, 0x000000000000679f}, {0x00000000000067af}, {0x00000000000067b3}} + + if reflect.DeepEqual(ret, tgt) { + t.Errorf("expected %#v got %#x", tgt, ret) + } +} diff --git a/src/debug/dwarf/entry.go b/src/debug/dwarf/entry.go new file mode 100644 index 0000000..5bb4297 --- /dev/null +++ b/src/debug/dwarf/entry.go @@ -0,0 +1,1218 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// DWARF debug information entry parser. +// An entry is a sequence of data items of a given format. +// The first word in the entry is an index into what DWARF +// calls the ``abbreviation table.'' An abbreviation is really +// just a type descriptor: it's an array of attribute tag/value format pairs. + +package dwarf + +import ( + "encoding/binary" + "errors" + "fmt" + "strconv" +) + +// a single entry's description: a sequence of attributes +type abbrev struct { + tag Tag + children bool + field []afield +} + +type afield struct { + attr Attr + fmt format + class Class + val int64 // for formImplicitConst +} + +// a map from entry format ids to their descriptions +type abbrevTable map[uint32]abbrev + +// parseAbbrev returns the abbreviation table that starts at byte off +// in the .debug_abbrev section. +func (d *Data) parseAbbrev(off uint64, vers int) (abbrevTable, error) { + if m, ok := d.abbrevCache[off]; ok { + return m, nil + } + + data := d.abbrev + if off > uint64(len(data)) { + data = nil + } else { + data = data[off:] + } + b := makeBuf(d, unknownFormat{}, "abbrev", 0, data) + + // Error handling is simplified by the buf getters + // returning an endless stream of 0s after an error. + m := make(abbrevTable) + for { + // Table ends with id == 0. + id := uint32(b.uint()) + if id == 0 { + break + } + + // Walk over attributes, counting. + n := 0 + b1 := b // Read from copy of b. + b1.uint() + b1.uint8() + for { + tag := b1.uint() + fmt := b1.uint() + if tag == 0 && fmt == 0 { + break + } + if format(fmt) == formImplicitConst { + b1.int() + } + n++ + } + if b1.err != nil { + return nil, b1.err + } + + // Walk over attributes again, this time writing them down. + var a abbrev + a.tag = Tag(b.uint()) + a.children = b.uint8() != 0 + a.field = make([]afield, n) + for i := range a.field { + a.field[i].attr = Attr(b.uint()) + a.field[i].fmt = format(b.uint()) + a.field[i].class = formToClass(a.field[i].fmt, a.field[i].attr, vers, &b) + if a.field[i].fmt == formImplicitConst { + a.field[i].val = b.int() + } + } + b.uint() + b.uint() + + m[id] = a + } + if b.err != nil { + return nil, b.err + } + d.abbrevCache[off] = m + return m, nil +} + +// attrIsExprloc indicates attributes that allow exprloc values that +// are encoded as block values in DWARF 2 and 3. See DWARF 4, Figure +// 20. +var attrIsExprloc = map[Attr]bool{ + AttrLocation: true, + AttrByteSize: true, + AttrBitOffset: true, + AttrBitSize: true, + AttrStringLength: true, + AttrLowerBound: true, + AttrReturnAddr: true, + AttrStrideSize: true, + AttrUpperBound: true, + AttrCount: true, + AttrDataMemberLoc: true, + AttrFrameBase: true, + AttrSegment: true, + AttrStaticLink: true, + AttrUseLocation: true, + AttrVtableElemLoc: true, + AttrAllocated: true, + AttrAssociated: true, + AttrDataLocation: true, + AttrStride: true, +} + +// attrPtrClass indicates the *ptr class of attributes that have +// encoding formSecOffset in DWARF 4 or formData* in DWARF 2 and 3. +var attrPtrClass = map[Attr]Class{ + AttrLocation: ClassLocListPtr, + AttrStmtList: ClassLinePtr, + AttrStringLength: ClassLocListPtr, + AttrReturnAddr: ClassLocListPtr, + AttrStartScope: ClassRangeListPtr, + AttrDataMemberLoc: ClassLocListPtr, + AttrFrameBase: ClassLocListPtr, + AttrMacroInfo: ClassMacPtr, + AttrSegment: ClassLocListPtr, + AttrStaticLink: ClassLocListPtr, + AttrUseLocation: ClassLocListPtr, + AttrVtableElemLoc: ClassLocListPtr, + AttrRanges: ClassRangeListPtr, + // The following are new in DWARF 5. + AttrStrOffsetsBase: ClassStrOffsetsPtr, + AttrAddrBase: ClassAddrPtr, + AttrRnglistsBase: ClassRngListsPtr, + AttrLoclistsBase: ClassLocListPtr, +} + +// formToClass returns the DWARF 4 Class for the given form. If the +// DWARF version is less then 4, it will disambiguate some forms +// depending on the attribute. +func formToClass(form format, attr Attr, vers int, b *buf) Class { + switch form { + default: + b.error("cannot determine class of unknown attribute form") + return 0 + + case formIndirect: + return ClassUnknown + + case formAddr, formAddrx, formAddrx1, formAddrx2, formAddrx3, formAddrx4: + return ClassAddress + + case formDwarfBlock1, formDwarfBlock2, formDwarfBlock4, formDwarfBlock: + // In DWARF 2 and 3, ClassExprLoc was encoded as a + // block. DWARF 4 distinguishes ClassBlock and + // ClassExprLoc, but there are no attributes that can + // be both, so we also promote ClassBlock values in + // DWARF 4 that should be ClassExprLoc in case + // producers get this wrong. + if attrIsExprloc[attr] { + return ClassExprLoc + } + return ClassBlock + + case formData1, formData2, formData4, formData8, formSdata, formUdata, formData16, formImplicitConst: + // In DWARF 2 and 3, ClassPtr was encoded as a + // constant. Unlike ClassExprLoc/ClassBlock, some + // DWARF 4 attributes need to distinguish Class*Ptr + // from ClassConstant, so we only do this promotion + // for versions 2 and 3. + if class, ok := attrPtrClass[attr]; vers < 4 && ok { + return class + } + return ClassConstant + + case formFlag, formFlagPresent: + return ClassFlag + + case formRefAddr, formRef1, formRef2, formRef4, formRef8, formRefUdata, formRefSup4, formRefSup8: + return ClassReference + + case formRefSig8: + return ClassReferenceSig + + case formString, formStrp, formStrx, formStrpSup, formLineStrp, formStrx1, formStrx2, formStrx3, formStrx4: + return ClassString + + case formSecOffset: + // DWARF 4 defines four *ptr classes, but doesn't + // distinguish them in the encoding. Disambiguate + // these classes using the attribute. + if class, ok := attrPtrClass[attr]; ok { + return class + } + return ClassUnknown + + case formExprloc: + return ClassExprLoc + + case formGnuRefAlt: + return ClassReferenceAlt + + case formGnuStrpAlt: + return ClassStringAlt + + case formLoclistx: + return ClassLocList + + case formRnglistx: + return ClassRngList + } +} + +// An entry is a sequence of attribute/value pairs. +type Entry struct { + Offset Offset // offset of Entry in DWARF info + Tag Tag // tag (kind of Entry) + Children bool // whether Entry is followed by children + Field []Field +} + +// A Field is a single attribute/value pair in an Entry. +// +// A value can be one of several "attribute classes" defined by DWARF. +// The Go types corresponding to each class are: +// +// DWARF class Go type Class +// ----------- ------- ----- +// address uint64 ClassAddress +// block []byte ClassBlock +// constant int64 ClassConstant +// flag bool ClassFlag +// reference +// to info dwarf.Offset ClassReference +// to type unit uint64 ClassReferenceSig +// string string ClassString +// exprloc []byte ClassExprLoc +// lineptr int64 ClassLinePtr +// loclistptr int64 ClassLocListPtr +// macptr int64 ClassMacPtr +// rangelistptr int64 ClassRangeListPtr +// +// For unrecognized or vendor-defined attributes, Class may be +// ClassUnknown. +type Field struct { + Attr Attr + Val any + Class Class +} + +// A Class is the DWARF 4 class of an attribute value. +// +// In general, a given attribute's value may take on one of several +// possible classes defined by DWARF, each of which leads to a +// slightly different interpretation of the attribute. +// +// DWARF version 4 distinguishes attribute value classes more finely +// than previous versions of DWARF. The reader will disambiguate +// coarser classes from earlier versions of DWARF into the appropriate +// DWARF 4 class. For example, DWARF 2 uses "constant" for constants +// as well as all types of section offsets, but the reader will +// canonicalize attributes in DWARF 2 files that refer to section +// offsets to one of the Class*Ptr classes, even though these classes +// were only defined in DWARF 3. +type Class int + +const ( + // ClassUnknown represents values of unknown DWARF class. + ClassUnknown Class = iota + + // ClassAddress represents values of type uint64 that are + // addresses on the target machine. + ClassAddress + + // ClassBlock represents values of type []byte whose + // interpretation depends on the attribute. + ClassBlock + + // ClassConstant represents values of type int64 that are + // constants. The interpretation of this constant depends on + // the attribute. + ClassConstant + + // ClassExprLoc represents values of type []byte that contain + // an encoded DWARF expression or location description. + ClassExprLoc + + // ClassFlag represents values of type bool. + ClassFlag + + // ClassLinePtr represents values that are an int64 offset + // into the "line" section. + ClassLinePtr + + // ClassLocListPtr represents values that are an int64 offset + // into the "loclist" section. + ClassLocListPtr + + // ClassMacPtr represents values that are an int64 offset into + // the "mac" section. + ClassMacPtr + + // ClassRangeListPtr represents values that are an int64 offset into + // the "rangelist" section. + ClassRangeListPtr + + // ClassReference represents values that are an Offset offset + // of an Entry in the info section (for use with Reader.Seek). + // The DWARF specification combines ClassReference and + // ClassReferenceSig into class "reference". + ClassReference + + // ClassReferenceSig represents values that are a uint64 type + // signature referencing a type Entry. + ClassReferenceSig + + // ClassString represents values that are strings. If the + // compilation unit specifies the AttrUseUTF8 flag (strongly + // recommended), the string value will be encoded in UTF-8. + // Otherwise, the encoding is unspecified. + ClassString + + // ClassReferenceAlt represents values of type int64 that are + // an offset into the DWARF "info" section of an alternate + // object file. + ClassReferenceAlt + + // ClassStringAlt represents values of type int64 that are an + // offset into the DWARF string section of an alternate object + // file. + ClassStringAlt + + // ClassAddrPtr represents values that are an int64 offset + // into the "addr" section. + ClassAddrPtr + + // ClassLocList represents values that are an int64 offset + // into the "loclists" section. + ClassLocList + + // ClassRngList represents values that are a uint64 offset + // from the base of the "rnglists" section. + ClassRngList + + // ClassRngListsPtr represents values that are an int64 offset + // into the "rnglists" section. These are used as the base for + // ClassRngList values. + ClassRngListsPtr + + // ClassStrOffsetsPtr represents values that are an int64 + // offset into the "str_offsets" section. + ClassStrOffsetsPtr +) + +//go:generate stringer -type=Class + +func (i Class) GoString() string { + return "dwarf." + i.String() +} + +// Val returns the value associated with attribute Attr in Entry, +// or nil if there is no such attribute. +// +// A common idiom is to merge the check for nil return with +// the check that the value has the expected dynamic type, as in: +// +// v, ok := e.Val(AttrSibling).(int64) +func (e *Entry) Val(a Attr) any { + if f := e.AttrField(a); f != nil { + return f.Val + } + return nil +} + +// AttrField returns the Field associated with attribute Attr in +// Entry, or nil if there is no such attribute. +func (e *Entry) AttrField(a Attr) *Field { + for i, f := range e.Field { + if f.Attr == a { + return &e.Field[i] + } + } + return nil +} + +// An Offset represents the location of an Entry within the DWARF info. +// (See Reader.Seek.) +type Offset uint32 + +// Entry reads a single entry from buf, decoding +// according to the given abbreviation table. +func (b *buf) entry(cu *Entry, atab abbrevTable, ubase Offset, vers int) *Entry { + off := b.off + id := uint32(b.uint()) + if id == 0 { + return &Entry{} + } + a, ok := atab[id] + if !ok { + b.error("unknown abbreviation table index") + return nil + } + e := &Entry{ + Offset: off, + Tag: a.tag, + Children: a.children, + Field: make([]Field, len(a.field)), + } + + // If we are currently parsing the compilation unit, + // we can't evaluate Addrx or Strx until we've seen the + // relevant base entry. + type delayed struct { + idx int + off uint64 + fmt format + } + var delay []delayed + + resolveStrx := func(strBase, off uint64) string { + off += strBase + if uint64(int(off)) != off { + b.error("DW_FORM_strx offset out of range") + } + + b1 := makeBuf(b.dwarf, b.format, "str_offsets", 0, b.dwarf.strOffsets) + b1.skip(int(off)) + is64, _ := b.format.dwarf64() + if is64 { + off = b1.uint64() + } else { + off = uint64(b1.uint32()) + } + if b1.err != nil { + b.err = b1.err + return "" + } + if uint64(int(off)) != off { + b.error("DW_FORM_strx indirect offset out of range") + } + b1 = makeBuf(b.dwarf, b.format, "str", 0, b.dwarf.str) + b1.skip(int(off)) + val := b1.string() + if b1.err != nil { + b.err = b1.err + } + return val + } + + resolveRnglistx := func(rnglistsBase, off uint64) uint64 { + is64, _ := b.format.dwarf64() + if is64 { + off *= 8 + } else { + off *= 4 + } + off += rnglistsBase + if uint64(int(off)) != off { + b.error("DW_FORM_rnglistx offset out of range") + } + + b1 := makeBuf(b.dwarf, b.format, "rnglists", 0, b.dwarf.rngLists) + b1.skip(int(off)) + if is64 { + off = b1.uint64() + } else { + off = uint64(b1.uint32()) + } + if b1.err != nil { + b.err = b1.err + return 0 + } + if uint64(int(off)) != off { + b.error("DW_FORM_rnglistx indirect offset out of range") + } + return rnglistsBase + off + } + + for i := range e.Field { + e.Field[i].Attr = a.field[i].attr + e.Field[i].Class = a.field[i].class + fmt := a.field[i].fmt + if fmt == formIndirect { + fmt = format(b.uint()) + e.Field[i].Class = formToClass(fmt, a.field[i].attr, vers, b) + } + var val any + switch fmt { + default: + b.error("unknown entry attr format 0x" + strconv.FormatInt(int64(fmt), 16)) + + // address + case formAddr: + val = b.addr() + case formAddrx, formAddrx1, formAddrx2, formAddrx3, formAddrx4: + var off uint64 + switch fmt { + case formAddrx: + off = b.uint() + case formAddrx1: + off = uint64(b.uint8()) + case formAddrx2: + off = uint64(b.uint16()) + case formAddrx3: + off = uint64(b.uint24()) + case formAddrx4: + off = uint64(b.uint32()) + } + if b.dwarf.addr == nil { + b.error("DW_FORM_addrx with no .debug_addr section") + } + if b.err != nil { + return nil + } + + // We have to adjust by the offset of the + // compilation unit. This won't work if the + // program uses Reader.Seek to skip over the + // unit. Not much we can do about that. + var addrBase int64 + if cu != nil { + addrBase, _ = cu.Val(AttrAddrBase).(int64) + } else if a.tag == TagCompileUnit { + delay = append(delay, delayed{i, off, formAddrx}) + break + } + + var err error + val, err = b.dwarf.debugAddr(b.format, uint64(addrBase), off) + if err != nil { + if b.err == nil { + b.err = err + } + return nil + } + + // block + case formDwarfBlock1: + val = b.bytes(int(b.uint8())) + case formDwarfBlock2: + val = b.bytes(int(b.uint16())) + case formDwarfBlock4: + val = b.bytes(int(b.uint32())) + case formDwarfBlock: + val = b.bytes(int(b.uint())) + + // constant + case formData1: + val = int64(b.uint8()) + case formData2: + val = int64(b.uint16()) + case formData4: + val = int64(b.uint32()) + case formData8: + val = int64(b.uint64()) + case formData16: + val = b.bytes(16) + case formSdata: + val = int64(b.int()) + case formUdata: + val = int64(b.uint()) + case formImplicitConst: + val = a.field[i].val + + // flag + case formFlag: + val = b.uint8() == 1 + // New in DWARF 4. + case formFlagPresent: + // The attribute is implicitly indicated as present, and no value is + // encoded in the debugging information entry itself. + val = true + + // reference to other entry + case formRefAddr: + vers := b.format.version() + if vers == 0 { + b.error("unknown version for DW_FORM_ref_addr") + } else if vers == 2 { + val = Offset(b.addr()) + } else { + is64, known := b.format.dwarf64() + if !known { + b.error("unknown size for DW_FORM_ref_addr") + } else if is64 { + val = Offset(b.uint64()) + } else { + val = Offset(b.uint32()) + } + } + case formRef1: + val = Offset(b.uint8()) + ubase + case formRef2: + val = Offset(b.uint16()) + ubase + case formRef4: + val = Offset(b.uint32()) + ubase + case formRef8: + val = Offset(b.uint64()) + ubase + case formRefUdata: + val = Offset(b.uint()) + ubase + + // string + case formString: + val = b.string() + case formStrp, formLineStrp: + var off uint64 // offset into .debug_str + is64, known := b.format.dwarf64() + if !known { + b.error("unknown size for DW_FORM_strp/line_strp") + } else if is64 { + off = b.uint64() + } else { + off = uint64(b.uint32()) + } + if uint64(int(off)) != off { + b.error("DW_FORM_strp/line_strp offset out of range") + } + if b.err != nil { + return nil + } + var b1 buf + if fmt == formStrp { + b1 = makeBuf(b.dwarf, b.format, "str", 0, b.dwarf.str) + } else { + if len(b.dwarf.lineStr) == 0 { + b.error("DW_FORM_line_strp with no .debug_line_str section") + return nil + } + b1 = makeBuf(b.dwarf, b.format, "line_str", 0, b.dwarf.lineStr) + } + b1.skip(int(off)) + val = b1.string() + if b1.err != nil { + b.err = b1.err + return nil + } + case formStrx, formStrx1, formStrx2, formStrx3, formStrx4: + var off uint64 + switch fmt { + case formStrx: + off = b.uint() + case formStrx1: + off = uint64(b.uint8()) + case formStrx2: + off = uint64(b.uint16()) + case formStrx3: + off = uint64(b.uint24()) + case formStrx4: + off = uint64(b.uint32()) + } + if len(b.dwarf.strOffsets) == 0 { + b.error("DW_FORM_strx with no .debug_str_offsets section") + } + is64, known := b.format.dwarf64() + if !known { + b.error("unknown offset size for DW_FORM_strx") + } + if b.err != nil { + return nil + } + if is64 { + off *= 8 + } else { + off *= 4 + } + + // We have to adjust by the offset of the + // compilation unit. This won't work if the + // program uses Reader.Seek to skip over the + // unit. Not much we can do about that. + var strBase int64 + if cu != nil { + strBase, _ = cu.Val(AttrStrOffsetsBase).(int64) + } else if a.tag == TagCompileUnit { + delay = append(delay, delayed{i, off, formStrx}) + break + } + + val = resolveStrx(uint64(strBase), off) + + case formStrpSup: + is64, known := b.format.dwarf64() + if !known { + b.error("unknown size for DW_FORM_strp_sup") + } else if is64 { + val = b.uint64() + } else { + val = b.uint32() + } + + // lineptr, loclistptr, macptr, rangelistptr + // New in DWARF 4, but clang can generate them with -gdwarf-2. + // Section reference, replacing use of formData4 and formData8. + case formSecOffset, formGnuRefAlt, formGnuStrpAlt: + is64, known := b.format.dwarf64() + if !known { + b.error("unknown size for form 0x" + strconv.FormatInt(int64(fmt), 16)) + } else if is64 { + val = int64(b.uint64()) + } else { + val = int64(b.uint32()) + } + + // exprloc + // New in DWARF 4. + case formExprloc: + val = b.bytes(int(b.uint())) + + // reference + // New in DWARF 4. + case formRefSig8: + // 64-bit type signature. + val = b.uint64() + case formRefSup4: + val = b.uint32() + case formRefSup8: + val = b.uint64() + + // loclist + case formLoclistx: + val = b.uint() + + // rnglist + case formRnglistx: + off := b.uint() + + // We have to adjust by the rnglists_base of + // the compilation unit. This won't work if + // the program uses Reader.Seek to skip over + // the unit. Not much we can do about that. + var rnglistsBase int64 + if cu != nil { + rnglistsBase, _ = cu.Val(AttrRnglistsBase).(int64) + } else if a.tag == TagCompileUnit { + delay = append(delay, delayed{i, off, formRnglistx}) + break + } + + val = resolveRnglistx(uint64(rnglistsBase), off) + } + + e.Field[i].Val = val + } + if b.err != nil { + return nil + } + + for _, del := range delay { + switch del.fmt { + case formAddrx: + addrBase, _ := e.Val(AttrAddrBase).(int64) + val, err := b.dwarf.debugAddr(b.format, uint64(addrBase), del.off) + if err != nil { + b.err = err + return nil + } + e.Field[del.idx].Val = val + case formStrx: + strBase, _ := e.Val(AttrStrOffsetsBase).(int64) + e.Field[del.idx].Val = resolveStrx(uint64(strBase), del.off) + if b.err != nil { + return nil + } + case formRnglistx: + rnglistsBase, _ := e.Val(AttrRnglistsBase).(int64) + e.Field[del.idx].Val = resolveRnglistx(uint64(rnglistsBase), del.off) + if b.err != nil { + return nil + } + } + } + + return e +} + +// A Reader allows reading Entry structures from a DWARF “info” section. +// The Entry structures are arranged in a tree. The Reader's Next function +// return successive entries from a pre-order traversal of the tree. +// If an entry has children, its Children field will be true, and the children +// follow, terminated by an Entry with Tag 0. +type Reader struct { + b buf + d *Data + err error + unit int + lastUnit bool // set if last entry returned by Next is TagCompileUnit/TagPartialUnit + lastChildren bool // .Children of last entry returned by Next + lastSibling Offset // .Val(AttrSibling) of last entry returned by Next + cu *Entry // current compilation unit +} + +// Reader returns a new Reader for Data. +// The reader is positioned at byte offset 0 in the DWARF “info” section. +func (d *Data) Reader() *Reader { + r := &Reader{d: d} + r.Seek(0) + return r +} + +// AddressSize returns the size in bytes of addresses in the current compilation +// unit. +func (r *Reader) AddressSize() int { + return r.d.unit[r.unit].asize +} + +// ByteOrder returns the byte order in the current compilation unit. +func (r *Reader) ByteOrder() binary.ByteOrder { + return r.b.order +} + +// Seek positions the Reader at offset off in the encoded entry stream. +// Offset 0 can be used to denote the first entry. +func (r *Reader) Seek(off Offset) { + d := r.d + r.err = nil + r.lastChildren = false + if off == 0 { + if len(d.unit) == 0 { + return + } + u := &d.unit[0] + r.unit = 0 + r.b = makeBuf(r.d, u, "info", u.off, u.data) + r.cu = nil + return + } + + i := d.offsetToUnit(off) + if i == -1 { + r.err = errors.New("offset out of range") + return + } + if i != r.unit { + r.cu = nil + } + u := &d.unit[i] + r.unit = i + r.b = makeBuf(r.d, u, "info", off, u.data[off-u.off:]) +} + +// maybeNextUnit advances to the next unit if this one is finished. +func (r *Reader) maybeNextUnit() { + for len(r.b.data) == 0 && r.unit+1 < len(r.d.unit) { + r.nextUnit() + } +} + +// nextUnit advances to the next unit. +func (r *Reader) nextUnit() { + r.unit++ + u := &r.d.unit[r.unit] + r.b = makeBuf(r.d, u, "info", u.off, u.data) + r.cu = nil +} + +// Next reads the next entry from the encoded entry stream. +// It returns nil, nil when it reaches the end of the section. +// It returns an error if the current offset is invalid or the data at the +// offset cannot be decoded as a valid Entry. +func (r *Reader) Next() (*Entry, error) { + if r.err != nil { + return nil, r.err + } + r.maybeNextUnit() + if len(r.b.data) == 0 { + return nil, nil + } + u := &r.d.unit[r.unit] + e := r.b.entry(r.cu, u.atable, u.base, u.vers) + if r.b.err != nil { + r.err = r.b.err + return nil, r.err + } + r.lastUnit = false + if e != nil { + r.lastChildren = e.Children + if r.lastChildren { + r.lastSibling, _ = e.Val(AttrSibling).(Offset) + } + if e.Tag == TagCompileUnit || e.Tag == TagPartialUnit { + r.lastUnit = true + r.cu = e + } + } else { + r.lastChildren = false + } + return e, nil +} + +// SkipChildren skips over the child entries associated with +// the last Entry returned by Next. If that Entry did not have +// children or Next has not been called, SkipChildren is a no-op. +func (r *Reader) SkipChildren() { + if r.err != nil || !r.lastChildren { + return + } + + // If the last entry had a sibling attribute, + // that attribute gives the offset of the next + // sibling, so we can avoid decoding the + // child subtrees. + if r.lastSibling >= r.b.off { + r.Seek(r.lastSibling) + return + } + + if r.lastUnit && r.unit+1 < len(r.d.unit) { + r.nextUnit() + return + } + + for { + e, err := r.Next() + if err != nil || e == nil || e.Tag == 0 { + break + } + if e.Children { + r.SkipChildren() + } + } +} + +// clone returns a copy of the reader. This is used by the typeReader +// interface. +func (r *Reader) clone() typeReader { + return r.d.Reader() +} + +// offset returns the current buffer offset. This is used by the +// typeReader interface. +func (r *Reader) offset() Offset { + return r.b.off +} + +// SeekPC returns the Entry for the compilation unit that includes pc, +// and positions the reader to read the children of that unit. If pc +// is not covered by any unit, SeekPC returns ErrUnknownPC and the +// position of the reader is undefined. +// +// Because compilation units can describe multiple regions of the +// executable, in the worst case SeekPC must search through all the +// ranges in all the compilation units. Each call to SeekPC starts the +// search at the compilation unit of the last call, so in general +// looking up a series of PCs will be faster if they are sorted. If +// the caller wishes to do repeated fast PC lookups, it should build +// an appropriate index using the Ranges method. +func (r *Reader) SeekPC(pc uint64) (*Entry, error) { + unit := r.unit + for i := 0; i < len(r.d.unit); i++ { + if unit >= len(r.d.unit) { + unit = 0 + } + r.err = nil + r.lastChildren = false + r.unit = unit + r.cu = nil + u := &r.d.unit[unit] + r.b = makeBuf(r.d, u, "info", u.off, u.data) + e, err := r.Next() + if err != nil || e == nil || e.Tag == 0 { + return nil, err + } + ranges, err := r.d.Ranges(e) + if err != nil { + return nil, err + } + for _, pcs := range ranges { + if pcs[0] <= pc && pc < pcs[1] { + return e, nil + } + } + unit++ + } + return nil, ErrUnknownPC +} + +// Ranges returns the PC ranges covered by e, a slice of [low,high) pairs. +// Only some entry types, such as TagCompileUnit or TagSubprogram, have PC +// ranges; for others, this will return nil with no error. +func (d *Data) Ranges(e *Entry) ([][2]uint64, error) { + var ret [][2]uint64 + + low, lowOK := e.Val(AttrLowpc).(uint64) + + var high uint64 + var highOK bool + highField := e.AttrField(AttrHighpc) + if highField != nil { + switch highField.Class { + case ClassAddress: + high, highOK = highField.Val.(uint64) + case ClassConstant: + off, ok := highField.Val.(int64) + if ok { + high = low + uint64(off) + highOK = true + } + } + } + + if lowOK && highOK { + ret = append(ret, [2]uint64{low, high}) + } + + var u *unit + if uidx := d.offsetToUnit(e.Offset); uidx >= 0 && uidx < len(d.unit) { + u = &d.unit[uidx] + } + + if u != nil && u.vers >= 5 && d.rngLists != nil { + // DWARF version 5 and later + field := e.AttrField(AttrRanges) + if field == nil { + return ret, nil + } + switch field.Class { + case ClassRangeListPtr: + ranges, rangesOK := field.Val.(int64) + if !rangesOK { + return ret, nil + } + cu, base, err := d.baseAddressForEntry(e) + if err != nil { + return nil, err + } + return d.dwarf5Ranges(u, cu, base, ranges, ret) + + case ClassRngList: + rnglist, ok := field.Val.(uint64) + if !ok { + return ret, nil + } + cu, base, err := d.baseAddressForEntry(e) + if err != nil { + return nil, err + } + return d.dwarf5Ranges(u, cu, base, int64(rnglist), ret) + + default: + return ret, nil + } + } + + // DWARF version 2 through 4 + ranges, rangesOK := e.Val(AttrRanges).(int64) + if rangesOK && d.ranges != nil { + _, base, err := d.baseAddressForEntry(e) + if err != nil { + return nil, err + } + return d.dwarf2Ranges(u, base, ranges, ret) + } + + return ret, nil +} + +// baseAddressForEntry returns the initial base address to be used when +// looking up the range list of entry e. +// DWARF specifies that this should be the lowpc attribute of the enclosing +// compilation unit, however comments in gdb/dwarf2read.c say that some +// versions of GCC use the entrypc attribute, so we check that too. +func (d *Data) baseAddressForEntry(e *Entry) (*Entry, uint64, error) { + var cu *Entry + if e.Tag == TagCompileUnit { + cu = e + } else { + i := d.offsetToUnit(e.Offset) + if i == -1 { + return nil, 0, errors.New("no unit for entry") + } + u := &d.unit[i] + b := makeBuf(d, u, "info", u.off, u.data) + cu = b.entry(nil, u.atable, u.base, u.vers) + if b.err != nil { + return nil, 0, b.err + } + } + + if cuEntry, cuEntryOK := cu.Val(AttrEntrypc).(uint64); cuEntryOK { + return cu, cuEntry, nil + } else if cuLow, cuLowOK := cu.Val(AttrLowpc).(uint64); cuLowOK { + return cu, cuLow, nil + } + + return cu, 0, nil +} + +func (d *Data) dwarf2Ranges(u *unit, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) { + if ranges < 0 || ranges > int64(len(d.ranges)) { + return nil, fmt.Errorf("invalid range offset %d (max %d)", ranges, len(d.ranges)) + } + buf := makeBuf(d, u, "ranges", Offset(ranges), d.ranges[ranges:]) + for len(buf.data) > 0 { + low := buf.addr() + high := buf.addr() + + if low == 0 && high == 0 { + break + } + + if low == ^uint64(0)>>uint((8-u.addrsize())*8) { + base = high + } else { + ret = append(ret, [2]uint64{base + low, base + high}) + } + } + + return ret, nil +} + +// dwarf5Ranges interprets a debug_rnglists sequence, see DWARFv5 section +// 2.17.3 (page 53). +func (d *Data) dwarf5Ranges(u *unit, cu *Entry, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) { + if ranges < 0 || ranges > int64(len(d.rngLists)) { + return nil, fmt.Errorf("invalid rnglist offset %d (max %d)", ranges, len(d.ranges)) + } + var addrBase int64 + if cu != nil { + addrBase, _ = cu.Val(AttrAddrBase).(int64) + } + + buf := makeBuf(d, u, "rnglists", 0, d.rngLists) + buf.skip(int(ranges)) + for { + opcode := buf.uint8() + switch opcode { + case rleEndOfList: + if buf.err != nil { + return nil, buf.err + } + return ret, nil + + case rleBaseAddressx: + baseIdx := buf.uint() + var err error + base, err = d.debugAddr(u, uint64(addrBase), baseIdx) + if err != nil { + return nil, err + } + + case rleStartxEndx: + startIdx := buf.uint() + endIdx := buf.uint() + + start, err := d.debugAddr(u, uint64(addrBase), startIdx) + if err != nil { + return nil, err + } + end, err := d.debugAddr(u, uint64(addrBase), endIdx) + if err != nil { + return nil, err + } + ret = append(ret, [2]uint64{start, end}) + + case rleStartxLength: + startIdx := buf.uint() + len := buf.uint() + start, err := d.debugAddr(u, uint64(addrBase), startIdx) + if err != nil { + return nil, err + } + ret = append(ret, [2]uint64{start, start + len}) + + case rleOffsetPair: + off1 := buf.uint() + off2 := buf.uint() + ret = append(ret, [2]uint64{base + off1, base + off2}) + + case rleBaseAddress: + base = buf.addr() + + case rleStartEnd: + start := buf.addr() + end := buf.addr() + ret = append(ret, [2]uint64{start, end}) + + case rleStartLength: + start := buf.addr() + len := buf.uint() + ret = append(ret, [2]uint64{start, start + len}) + } + } +} + +// debugAddr returns the address at idx in debug_addr +func (d *Data) debugAddr(format dataFormat, addrBase, idx uint64) (uint64, error) { + off := idx*uint64(format.addrsize()) + addrBase + + if uint64(int(off)) != off { + return 0, errors.New("offset out of range") + } + + b := makeBuf(d, format, "addr", 0, d.addr) + b.skip(int(off)) + val := b.addr() + if b.err != nil { + return 0, b.err + } + return val, nil +} diff --git a/src/debug/dwarf/entry_test.go b/src/debug/dwarf/entry_test.go new file mode 100644 index 0000000..4e96dbf --- /dev/null +++ b/src/debug/dwarf/entry_test.go @@ -0,0 +1,444 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf_test + +import ( + . "debug/dwarf" + "encoding/binary" + "path/filepath" + "reflect" + "testing" +) + +func TestSplit(t *testing.T) { + // debug/dwarf doesn't (currently) support split DWARF, but + // the attributes that pointed to the split DWARF used to + // cause loading the DWARF data to fail entirely (issue + // #12592). Test that we can at least read the DWARF data. + d := elfData(t, "testdata/split.elf") + r := d.Reader() + e, err := r.Next() + if err != nil { + t.Fatal(err) + } + if e.Tag != TagCompileUnit { + t.Fatalf("bad tag: have %s, want %s", e.Tag, TagCompileUnit) + } + // Check that we were able to parse the unknown section offset + // field, even if we can't figure out its DWARF class. + const AttrGNUAddrBase Attr = 0x2133 + f := e.AttrField(AttrGNUAddrBase) + if _, ok := f.Val.(int64); !ok { + t.Fatalf("bad attribute value type: have %T, want int64", f.Val) + } + if f.Class != ClassUnknown { + t.Fatalf("bad class: have %s, want %s", f.Class, ClassUnknown) + } +} + +// wantRange maps from a PC to the ranges of the compilation unit +// containing that PC. +type wantRange struct { + pc uint64 + ranges [][2]uint64 +} + +func TestReaderSeek(t *testing.T) { + want := []wantRange{ + {0x40059d, [][2]uint64{{0x40059d, 0x400601}}}, + {0x400600, [][2]uint64{{0x40059d, 0x400601}}}, + {0x400601, [][2]uint64{{0x400601, 0x400611}}}, + {0x4005f0, [][2]uint64{{0x40059d, 0x400601}}}, // loop test + {0x10, nil}, + {0x400611, nil}, + } + testRanges(t, "testdata/line-gcc.elf", want) + + want = []wantRange{ + {0x401122, [][2]uint64{{0x401122, 0x401166}}}, + {0x401165, [][2]uint64{{0x401122, 0x401166}}}, + {0x401166, [][2]uint64{{0x401166, 0x401179}}}, + } + testRanges(t, "testdata/line-gcc-dwarf5.elf", want) + + want = []wantRange{ + {0x401130, [][2]uint64{{0x401130, 0x40117e}}}, + {0x40117d, [][2]uint64{{0x401130, 0x40117e}}}, + {0x40117e, nil}, + } + testRanges(t, "testdata/line-clang-dwarf5.elf", want) +} + +func TestRangesSection(t *testing.T) { + want := []wantRange{ + {0x400500, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}}, + {0x400400, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}}, + {0x400548, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}}, + {0x400407, [][2]uint64{{0x400500, 0x400549}, {0x400400, 0x400408}}}, + {0x400408, nil}, + {0x400449, nil}, + {0x4003ff, nil}, + } + testRanges(t, "testdata/ranges.elf", want) +} + +func TestRangesRnglistx(t *testing.T) { + want := []wantRange{ + {0x401000, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}}, + {0x40101c, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}}, + {0x40101d, nil}, + {0x40101f, nil}, + {0x401020, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}}, + {0x40102b, [][2]uint64{{0x401020, 0x40102c}, {0x401000, 0x40101d}}}, + {0x40102c, nil}, + } + testRanges(t, "testdata/rnglistx.elf", want) +} + +func testRanges(t *testing.T, name string, want []wantRange) { + d := elfData(t, name) + r := d.Reader() + for _, w := range want { + entry, err := r.SeekPC(w.pc) + if err != nil { + if w.ranges != nil { + t.Errorf("%s: missing Entry for %#x", name, w.pc) + } + if err != ErrUnknownPC { + t.Errorf("%s: expected ErrUnknownPC for %#x, got %v", name, w.pc, err) + } + continue + } + + ranges, err := d.Ranges(entry) + if err != nil { + t.Errorf("%s: %v", name, err) + continue + } + if !reflect.DeepEqual(ranges, w.ranges) { + t.Errorf("%s: for %#x got %x, expected %x", name, w.pc, ranges, w.ranges) + } + } +} + +func TestReaderRanges(t *testing.T) { + type subprograms []struct { + name string + ranges [][2]uint64 + } + tests := []struct { + filename string + subprograms subprograms + }{ + { + "testdata/line-gcc.elf", + subprograms{ + {"f1", [][2]uint64{{0x40059d, 0x4005e7}}}, + {"main", [][2]uint64{{0x4005e7, 0x400601}}}, + {"f2", [][2]uint64{{0x400601, 0x400611}}}, + }, + }, + { + "testdata/line-gcc-dwarf5.elf", + subprograms{ + {"main", [][2]uint64{{0x401147, 0x401166}}}, + {"f1", [][2]uint64{{0x401122, 0x401147}}}, + {"f2", [][2]uint64{{0x401166, 0x401179}}}, + }, + }, + { + "testdata/line-clang-dwarf5.elf", + subprograms{ + {"main", [][2]uint64{{0x401130, 0x401144}}}, + {"f1", [][2]uint64{{0x401150, 0x40117e}}}, + {"f2", [][2]uint64{{0x401180, 0x401197}}}, + }, + }, + } + + for _, test := range tests { + d := elfData(t, test.filename) + subprograms := test.subprograms + + r := d.Reader() + i := 0 + for entry, err := r.Next(); entry != nil && err == nil; entry, err = r.Next() { + if entry.Tag != TagSubprogram { + continue + } + + if i > len(subprograms) { + t.Fatalf("%s: too many subprograms (expected at most %d)", test.filename, i) + } + + if got := entry.Val(AttrName).(string); got != subprograms[i].name { + t.Errorf("%s: subprogram %d name is %s, expected %s", test.filename, i, got, subprograms[i].name) + } + ranges, err := d.Ranges(entry) + if err != nil { + t.Errorf("%s: subprogram %d: %v", test.filename, i, err) + continue + } + if !reflect.DeepEqual(ranges, subprograms[i].ranges) { + t.Errorf("%s: subprogram %d ranges are %x, expected %x", test.filename, i, ranges, subprograms[i].ranges) + } + i++ + } + + if i < len(subprograms) { + t.Errorf("%s: saw only %d subprograms, expected %d", test.filename, i, len(subprograms)) + } + } +} + +func Test64Bit(t *testing.T) { + // I don't know how to generate a 64-bit DWARF debug + // compilation unit except by using XCOFF, so this is + // hand-written. + tests := []struct { + name string + info []byte + addrSize int + byteOrder binary.ByteOrder + }{ + { + "32-bit little", + []byte{0x30, 0, 0, 0, // comp unit length + 4, 0, // DWARF version 4 + 0, 0, 0, 0, // abbrev offset + 8, // address size + 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }, + 8, binary.LittleEndian, + }, + { + "64-bit little", + []byte{0xff, 0xff, 0xff, 0xff, // 64-bit DWARF + 0x30, 0, 0, 0, 0, 0, 0, 0, // comp unit length + 4, 0, // DWARF version 4 + 0, 0, 0, 0, 0, 0, 0, 0, // abbrev offset + 8, // address size + 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }, + 8, binary.LittleEndian, + }, + { + "64-bit big", + []byte{0xff, 0xff, 0xff, 0xff, // 64-bit DWARF + 0, 0, 0, 0, 0, 0, 0, 0x30, // comp unit length + 0, 4, // DWARF version 4 + 0, 0, 0, 0, 0, 0, 0, 0, // abbrev offset + 8, // address size + 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }, + 8, binary.BigEndian, + }, + } + + for _, test := range tests { + data, err := New(nil, nil, nil, test.info, nil, nil, nil, nil) + if err != nil { + t.Errorf("%s: %v", test.name, err) + } + + r := data.Reader() + if r.AddressSize() != test.addrSize { + t.Errorf("%s: got address size %d, want %d", test.name, r.AddressSize(), test.addrSize) + } + if r.ByteOrder() != test.byteOrder { + t.Errorf("%s: got byte order %s, want %s", test.name, r.ByteOrder(), test.byteOrder) + } + } +} + +func TestUnitIteration(t *testing.T) { + // Iterate over all ELF test files we have and ensure that + // we get the same set of compilation units skipping (method 0) + // and not skipping (method 1) CU children. + files, err := filepath.Glob(filepath.Join("testdata", "*.elf")) + if err != nil { + t.Fatal(err) + } + for _, file := range files { + t.Run(file, func(t *testing.T) { + d := elfData(t, file) + var units [2][]any + for method := range units { + for r := d.Reader(); ; { + ent, err := r.Next() + if err != nil { + t.Fatal(err) + } + if ent == nil { + break + } + if ent.Tag == TagCompileUnit { + units[method] = append(units[method], ent.Val(AttrName)) + } + if method == 0 { + if ent.Tag != TagCompileUnit { + t.Fatalf("found unexpected tag %v on top level", ent.Tag) + } + r.SkipChildren() + } + } + } + t.Logf("skipping CUs: %v", units[0]) + t.Logf("not-skipping CUs: %v", units[1]) + if !reflect.DeepEqual(units[0], units[1]) { + t.Fatal("set of CUs differ") + } + }) + } +} + +func TestIssue51758(t *testing.T) { + abbrev := []byte{0x21, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x22, 0x5c, + 0x6e, 0x20, 0x20, 0x20, 0x20, 0x69, 0x6e, 0x66, 0x6f, 0x3a, 0x20, + 0x5c, 0x22, 0x5c, 0x5c, 0x30, 0x30, 0x35, 0x5c, 0x5c, 0x30, 0x30, + 0x30, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x5c, 0x30, 0x30, 0x30, + 0x5c, 0x5c, 0x30, 0x30, 0x34, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, + 0x5c, 0x30, 0x30, 0x30, 0x2d, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, + 0x22, 0x5c, 0x6e, 0x20, 0x20, 0x7d, 0x5c, 0x6e, 0x7d, 0x5c, 0x6e, + 0x22, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x66, 0x72, 0x61, 0x6d, 0x65, + 0x3a, 0x20, 0x22, 0x21, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x33, 0x37, 0x37, 0x22, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, + 0x6e, 0x66, 0x6f, 0x3a, 0x20, 0x22, 0x5c, 0x30, 0x30, 0x35, 0x5c, + 0x30, 0x30, 0x30, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x30, 0x30, 0x30, + 0x5c, 0x30, 0x30, 0x34, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x30, 0x30, + 0x30, 0x2d, 0x5c, 0x30, 0x30, 0x30, 0x22, 0x0a, 0x20, 0x20, 0x7d, + 0x0a, 0x7d, 0x0a, 0x6c, 0x69, 0x73, 0x74, 0x20, 0x7b, 0x0a, 0x7d, + 0x0a, 0x6c, 0x69, 0x73, 0x74, 0x20, 0x7b, 0x0a, 0x7d, 0x0a, 0x6c, + 0x69, 0x73, 0x74, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x4e, 0x65, 0x77, + 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x61, 0x62, 0x62, 0x72, + 0x65, 0x76, 0x3a, 0x20, 0x22, 0x5c, 0x30, 0x30, 0x35, 0x5c, 0x30, + 0x30, 0x30, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x30, 0x30, 0x30, 0x5c, + 0x30, 0x30, 0x34, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x30, 0x30, 0x30, + 0x2d, 0x5c, 0x30, 0x30, 0x30, 0x6c, 0x69, 0x73, 0x74, 0x20, 0x7b, + 0x5c, 0x6e, 0x20, 0x20, 0x4e, 0x65, 0x77, 0x20, 0x7b, 0x5c, 0x6e, + 0x20, 0x20, 0x20, 0x20, 0x61, 0x62, 0x62, 0x72, 0x65, 0x76, 0x3a, + 0x20, 0x5c, 0x22, 0x21, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x22, 0x5c, 0x6e, 0x20, 0x20, 0x20, + 0x20, 0x69, 0x6e, 0x66, 0x6f, 0x3a, 0x20, 0x5c, 0x22, 0x5c, 0x5c, + 0x30, 0x30, 0x35, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x5c, 0x30, + 0x30, 0x30, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x5c, 0x30, 0x30, + 0x34, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x5c, 0x30, 0x30, 0x30, + 0x2d, 0x5c, 0x5c, 0x30, 0x30, 0x30, 0x5c, 0x22, 0x5c, 0x6e, 0x20, + 0x20, 0x7d, 0x5c, 0x6e, 0x7d, 0x5c, 0x6e, 0x22, 0x0a, 0x20, 0x20, + 0x20, 0x20, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x3a, 0x20, 0x22, 0x21, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, + 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, + 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, + 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, + 0x37, 0x5c, 0x33, 0x37, 0x37, 0x5c, 0x33, 0x37, 0x37, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff} + aranges := []byte{0x2c} + frame := []byte{} + info := []byte{0x5, 0x0, 0x0, 0x0, 0x4, 0x0, 0x0, 0x2d, 0x0, 0x5, + 0x0, 0x0, 0x0, 0x4, 0x0, 0x0, 0x2d, 0x0} + + // The input above is malformed; the goal here it just to make sure + // that we don't get a panic or other bad behavior while trying to + // construct a dwarf.Data object from the input. For good measure, + // test to make sure we can handle the case where the input is + // truncated as well. + for i := 0; i <= len(info); i++ { + truncated := info[:i] + dw, err := New(abbrev, aranges, frame, truncated, nil, nil, nil, nil) + if err == nil { + t.Errorf("expected error") + } else { + if dw != nil { + t.Errorf("got non-nil dw, wanted nil") + } + } + } +} + +func TestIssue52045(t *testing.T) { + var abbrev, aranges, frame, line, pubnames, ranges, str []byte + info := []byte{0x7, 0x0, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0} + + // A hand-crafted input corresponding to a minimal-size + // .debug_info (header only, no DIEs) and an empty abbrev table. + data0, _ := New(abbrev, aranges, frame, info, line, pubnames, ranges, str) + reader0 := data0.Reader() + entry0, _ := reader0.SeekPC(0x0) + // main goal is to make sure we can get here without crashing + if entry0 != nil { + t.Errorf("got non-nil entry0, wanted nil") + } +} diff --git a/src/debug/dwarf/export_test.go b/src/debug/dwarf/export_test.go new file mode 100644 index 0000000..b8a25ff --- /dev/null +++ b/src/debug/dwarf/export_test.go @@ -0,0 +1,7 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf + +var PathJoin = pathJoin diff --git a/src/debug/dwarf/line.go b/src/debug/dwarf/line.go new file mode 100644 index 0000000..4df4a17 --- /dev/null +++ b/src/debug/dwarf/line.go @@ -0,0 +1,852 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf + +import ( + "errors" + "fmt" + "io" + "path" + "strings" +) + +// A LineReader reads a sequence of LineEntry structures from a DWARF +// "line" section for a single compilation unit. LineEntries occur in +// order of increasing PC and each LineEntry gives metadata for the +// instructions from that LineEntry's PC to just before the next +// LineEntry's PC. The last entry will have its EndSequence field set. +type LineReader struct { + buf buf + + // Original .debug_line section data. Used by Seek. + section []byte + + str []byte // .debug_str + lineStr []byte // .debug_line_str + + // Header information + version uint16 + addrsize int + segmentSelectorSize int + minInstructionLength int + maxOpsPerInstruction int + defaultIsStmt bool + lineBase int + lineRange int + opcodeBase int + opcodeLengths []int + directories []string + fileEntries []*LineFile + + programOffset Offset // section offset of line number program + endOffset Offset // section offset of byte following program + + initialFileEntries int // initial length of fileEntries + + // Current line number program state machine registers + state LineEntry // public state + fileIndex int // private state +} + +// A LineEntry is a row in a DWARF line table. +type LineEntry struct { + // Address is the program-counter value of a machine + // instruction generated by the compiler. This LineEntry + // applies to each instruction from Address to just before the + // Address of the next LineEntry. + Address uint64 + + // OpIndex is the index of an operation within a VLIW + // instruction. The index of the first operation is 0. For + // non-VLIW architectures, it will always be 0. Address and + // OpIndex together form an operation pointer that can + // reference any individual operation within the instruction + // stream. + OpIndex int + + // File is the source file corresponding to these + // instructions. + File *LineFile + + // Line is the source code line number corresponding to these + // instructions. Lines are numbered beginning at 1. It may be + // 0 if these instructions cannot be attributed to any source + // line. + Line int + + // Column is the column number within the source line of these + // instructions. Columns are numbered beginning at 1. It may + // be 0 to indicate the "left edge" of the line. + Column int + + // IsStmt indicates that Address is a recommended breakpoint + // location, such as the beginning of a line, statement, or a + // distinct subpart of a statement. + IsStmt bool + + // BasicBlock indicates that Address is the beginning of a + // basic block. + BasicBlock bool + + // PrologueEnd indicates that Address is one (of possibly + // many) PCs where execution should be suspended for a + // breakpoint on entry to the containing function. + // + // Added in DWARF 3. + PrologueEnd bool + + // EpilogueBegin indicates that Address is one (of possibly + // many) PCs where execution should be suspended for a + // breakpoint on exit from this function. + // + // Added in DWARF 3. + EpilogueBegin bool + + // ISA is the instruction set architecture for these + // instructions. Possible ISA values should be defined by the + // applicable ABI specification. + // + // Added in DWARF 3. + ISA int + + // Discriminator is an arbitrary integer indicating the block + // to which these instructions belong. It serves to + // distinguish among multiple blocks that may all have with + // the same source file, line, and column. Where only one + // block exists for a given source position, it should be 0. + // + // Added in DWARF 3. + Discriminator int + + // EndSequence indicates that Address is the first byte after + // the end of a sequence of target machine instructions. If it + // is set, only this and the Address field are meaningful. A + // line number table may contain information for multiple + // potentially disjoint instruction sequences. The last entry + // in a line table should always have EndSequence set. + EndSequence bool +} + +// A LineFile is a source file referenced by a DWARF line table entry. +type LineFile struct { + Name string + Mtime uint64 // Implementation defined modification time, or 0 if unknown + Length int // File length, or 0 if unknown +} + +// LineReader returns a new reader for the line table of compilation +// unit cu, which must be an Entry with tag TagCompileUnit. +// +// If this compilation unit has no line table, it returns nil, nil. +func (d *Data) LineReader(cu *Entry) (*LineReader, error) { + if d.line == nil { + // No line tables available. + return nil, nil + } + + // Get line table information from cu. + off, ok := cu.Val(AttrStmtList).(int64) + if !ok { + // cu has no line table. + return nil, nil + } + if off < 0 || off > int64(len(d.line)) { + return nil, errors.New("AttrStmtList value out of range") + } + // AttrCompDir is optional if all file names are absolute. Use + // the empty string if it's not present. + compDir, _ := cu.Val(AttrCompDir).(string) + + // Create the LineReader. + u := &d.unit[d.offsetToUnit(cu.Offset)] + buf := makeBuf(d, u, "line", Offset(off), d.line[off:]) + // The compilation directory is implicitly directories[0]. + r := LineReader{ + buf: buf, + section: d.line, + str: d.str, + lineStr: d.lineStr, + } + + // Read the header. + if err := r.readHeader(compDir); err != nil { + return nil, err + } + + // Initialize line reader state. + r.Reset() + + return &r, nil +} + +// readHeader reads the line number program header from r.buf and sets +// all of the header fields in r. +func (r *LineReader) readHeader(compDir string) error { + buf := &r.buf + + // Read basic header fields [DWARF2 6.2.4]. + hdrOffset := buf.off + unitLength, dwarf64 := buf.unitLength() + r.endOffset = buf.off + unitLength + if r.endOffset > buf.off+Offset(len(buf.data)) { + return DecodeError{"line", hdrOffset, fmt.Sprintf("line table end %d exceeds section size %d", r.endOffset, buf.off+Offset(len(buf.data)))} + } + r.version = buf.uint16() + if buf.err == nil && (r.version < 2 || r.version > 5) { + // DWARF goes to all this effort to make new opcodes + // backward-compatible, and then adds fields right in + // the middle of the header in new versions, so we're + // picky about only supporting known line table + // versions. + return DecodeError{"line", hdrOffset, fmt.Sprintf("unknown line table version %d", r.version)} + } + if r.version >= 5 { + r.addrsize = int(buf.uint8()) + r.segmentSelectorSize = int(buf.uint8()) + } else { + r.addrsize = buf.format.addrsize() + r.segmentSelectorSize = 0 + } + var headerLength Offset + if dwarf64 { + headerLength = Offset(buf.uint64()) + } else { + headerLength = Offset(buf.uint32()) + } + programOffset := buf.off + headerLength + if programOffset > r.endOffset { + return DecodeError{"line", hdrOffset, fmt.Sprintf("malformed line table: program offset %d exceeds end offset %d", programOffset, r.endOffset)} + } + r.programOffset = programOffset + r.minInstructionLength = int(buf.uint8()) + if r.version >= 4 { + // [DWARF4 6.2.4] + r.maxOpsPerInstruction = int(buf.uint8()) + } else { + r.maxOpsPerInstruction = 1 + } + r.defaultIsStmt = buf.uint8() != 0 + r.lineBase = int(int8(buf.uint8())) + r.lineRange = int(buf.uint8()) + + // Validate header. + if buf.err != nil { + return buf.err + } + if r.maxOpsPerInstruction == 0 { + return DecodeError{"line", hdrOffset, "invalid maximum operations per instruction: 0"} + } + if r.lineRange == 0 { + return DecodeError{"line", hdrOffset, "invalid line range: 0"} + } + + // Read standard opcode length table. This table starts with opcode 1. + r.opcodeBase = int(buf.uint8()) + r.opcodeLengths = make([]int, r.opcodeBase) + for i := 1; i < r.opcodeBase; i++ { + r.opcodeLengths[i] = int(buf.uint8()) + } + + // Validate opcode lengths. + if buf.err != nil { + return buf.err + } + for i, length := range r.opcodeLengths { + if known, ok := knownOpcodeLengths[i]; ok && known != length { + return DecodeError{"line", hdrOffset, fmt.Sprintf("opcode %d expected to have length %d, but has length %d", i, known, length)} + } + } + + if r.version < 5 { + // Read include directories table. + r.directories = []string{compDir} + for { + directory := buf.string() + if buf.err != nil { + return buf.err + } + if len(directory) == 0 { + break + } + if !pathIsAbs(directory) { + // Relative paths are implicitly relative to + // the compilation directory. + directory = pathJoin(compDir, directory) + } + r.directories = append(r.directories, directory) + } + + // Read file name list. File numbering starts with 1, + // so leave the first entry nil. + r.fileEntries = make([]*LineFile, 1) + for { + if done, err := r.readFileEntry(); err != nil { + return err + } else if done { + break + } + } + } else { + dirFormat := r.readLNCTFormat() + c := buf.uint() + r.directories = make([]string, c) + for i := range r.directories { + dir, _, _, err := r.readLNCT(dirFormat, dwarf64) + if err != nil { + return err + } + r.directories[i] = dir + } + fileFormat := r.readLNCTFormat() + c = buf.uint() + r.fileEntries = make([]*LineFile, c) + for i := range r.fileEntries { + name, mtime, size, err := r.readLNCT(fileFormat, dwarf64) + if err != nil { + return err + } + r.fileEntries[i] = &LineFile{name, mtime, int(size)} + } + } + + r.initialFileEntries = len(r.fileEntries) + + return buf.err +} + +// lnctForm is a pair of an LNCT code and a form. This represents an +// entry in the directory name or file name description in the DWARF 5 +// line number program header. +type lnctForm struct { + lnct int + form format +} + +// readLNCTFormat reads an LNCT format description. +func (r *LineReader) readLNCTFormat() []lnctForm { + c := r.buf.uint8() + ret := make([]lnctForm, c) + for i := range ret { + ret[i].lnct = int(r.buf.uint()) + ret[i].form = format(r.buf.uint()) + } + return ret +} + +// readLNCT reads a sequence of LNCT entries and returns path information. +func (r *LineReader) readLNCT(s []lnctForm, dwarf64 bool) (path string, mtime uint64, size uint64, err error) { + var dir string + for _, lf := range s { + var str string + var val uint64 + switch lf.form { + case formString: + str = r.buf.string() + case formStrp, formLineStrp: + var off uint64 + if dwarf64 { + off = r.buf.uint64() + } else { + off = uint64(r.buf.uint32()) + } + if uint64(int(off)) != off { + return "", 0, 0, DecodeError{"line", r.buf.off, "strp/line_strp offset out of range"} + } + var b1 buf + if lf.form == formStrp { + b1 = makeBuf(r.buf.dwarf, r.buf.format, "str", 0, r.str) + } else { + b1 = makeBuf(r.buf.dwarf, r.buf.format, "line_str", 0, r.lineStr) + } + b1.skip(int(off)) + str = b1.string() + if b1.err != nil { + return "", 0, 0, DecodeError{"line", r.buf.off, b1.err.Error()} + } + case formStrpSup: + // Supplemental sections not yet supported. + if dwarf64 { + r.buf.uint64() + } else { + r.buf.uint32() + } + case formStrx: + // .debug_line.dwo sections not yet supported. + r.buf.uint() + case formStrx1: + r.buf.uint8() + case formStrx2: + r.buf.uint16() + case formStrx3: + r.buf.uint24() + case formStrx4: + r.buf.uint32() + case formData1: + val = uint64(r.buf.uint8()) + case formData2: + val = uint64(r.buf.uint16()) + case formData4: + val = uint64(r.buf.uint32()) + case formData8: + val = r.buf.uint64() + case formData16: + r.buf.bytes(16) + case formDwarfBlock: + r.buf.bytes(int(r.buf.uint())) + case formUdata: + val = r.buf.uint() + } + + switch lf.lnct { + case lnctPath: + path = str + case lnctDirectoryIndex: + if val >= uint64(len(r.directories)) { + return "", 0, 0, DecodeError{"line", r.buf.off, "directory index out of range"} + } + dir = r.directories[val] + case lnctTimestamp: + mtime = val + case lnctSize: + size = val + case lnctMD5: + // Ignored. + } + } + + if dir != "" && path != "" { + path = pathJoin(dir, path) + } + + return path, mtime, size, nil +} + +// readFileEntry reads a file entry from either the header or a +// DW_LNE_define_file extended opcode and adds it to r.fileEntries. A +// true return value indicates that there are no more entries to read. +func (r *LineReader) readFileEntry() (bool, error) { + name := r.buf.string() + if r.buf.err != nil { + return false, r.buf.err + } + if len(name) == 0 { + return true, nil + } + off := r.buf.off + dirIndex := int(r.buf.uint()) + if !pathIsAbs(name) { + if dirIndex >= len(r.directories) { + return false, DecodeError{"line", off, "directory index too large"} + } + name = pathJoin(r.directories[dirIndex], name) + } + mtime := r.buf.uint() + length := int(r.buf.uint()) + + // If this is a dynamically added path and the cursor was + // backed up, we may have already added this entry. Avoid + // updating existing line table entries in this case. This + // avoids an allocation and potential racy access to the slice + // backing store if the user called Files. + if len(r.fileEntries) < cap(r.fileEntries) { + fe := r.fileEntries[:len(r.fileEntries)+1] + if fe[len(fe)-1] != nil { + // We already processed this addition. + r.fileEntries = fe + return false, nil + } + } + r.fileEntries = append(r.fileEntries, &LineFile{name, mtime, length}) + return false, nil +} + +// updateFile updates r.state.File after r.fileIndex has +// changed or r.fileEntries has changed. +func (r *LineReader) updateFile() { + if r.fileIndex < len(r.fileEntries) { + r.state.File = r.fileEntries[r.fileIndex] + } else { + r.state.File = nil + } +} + +// Next sets *entry to the next row in this line table and moves to +// the next row. If there are no more entries and the line table is +// properly terminated, it returns io.EOF. +// +// Rows are always in order of increasing entry.Address, but +// entry.Line may go forward or backward. +func (r *LineReader) Next(entry *LineEntry) error { + if r.buf.err != nil { + return r.buf.err + } + + // Execute opcodes until we reach an opcode that emits a line + // table entry. + for { + if len(r.buf.data) == 0 { + return io.EOF + } + emit := r.step(entry) + if r.buf.err != nil { + return r.buf.err + } + if emit { + return nil + } + } +} + +// knownOpcodeLengths gives the opcode lengths (in varint arguments) +// of known standard opcodes. +var knownOpcodeLengths = map[int]int{ + lnsCopy: 0, + lnsAdvancePC: 1, + lnsAdvanceLine: 1, + lnsSetFile: 1, + lnsNegateStmt: 0, + lnsSetBasicBlock: 0, + lnsConstAddPC: 0, + lnsSetPrologueEnd: 0, + lnsSetEpilogueBegin: 0, + lnsSetISA: 1, + // lnsFixedAdvancePC takes a uint8 rather than a varint; it's + // unclear what length the header is supposed to claim, so + // ignore it. +} + +// step processes the next opcode and updates r.state. If the opcode +// emits a row in the line table, this updates *entry and returns +// true. +func (r *LineReader) step(entry *LineEntry) bool { + opcode := int(r.buf.uint8()) + + if opcode >= r.opcodeBase { + // Special opcode [DWARF2 6.2.5.1, DWARF4 6.2.5.1] + adjustedOpcode := opcode - r.opcodeBase + r.advancePC(adjustedOpcode / r.lineRange) + lineDelta := r.lineBase + adjustedOpcode%r.lineRange + r.state.Line += lineDelta + goto emit + } + + switch opcode { + case 0: + // Extended opcode [DWARF2 6.2.5.3] + length := Offset(r.buf.uint()) + startOff := r.buf.off + opcode := r.buf.uint8() + + switch opcode { + case lneEndSequence: + r.state.EndSequence = true + *entry = r.state + r.resetState() + + case lneSetAddress: + switch r.addrsize { + case 1: + r.state.Address = uint64(r.buf.uint8()) + case 2: + r.state.Address = uint64(r.buf.uint16()) + case 4: + r.state.Address = uint64(r.buf.uint32()) + case 8: + r.state.Address = r.buf.uint64() + default: + r.buf.error("unknown address size") + } + + case lneDefineFile: + if done, err := r.readFileEntry(); err != nil { + r.buf.err = err + return false + } else if done { + r.buf.err = DecodeError{"line", startOff, "malformed DW_LNE_define_file operation"} + return false + } + r.updateFile() + + case lneSetDiscriminator: + // [DWARF4 6.2.5.3] + r.state.Discriminator = int(r.buf.uint()) + } + + r.buf.skip(int(startOff + length - r.buf.off)) + + if opcode == lneEndSequence { + return true + } + + // Standard opcodes [DWARF2 6.2.5.2] + case lnsCopy: + goto emit + + case lnsAdvancePC: + r.advancePC(int(r.buf.uint())) + + case lnsAdvanceLine: + r.state.Line += int(r.buf.int()) + + case lnsSetFile: + r.fileIndex = int(r.buf.uint()) + r.updateFile() + + case lnsSetColumn: + r.state.Column = int(r.buf.uint()) + + case lnsNegateStmt: + r.state.IsStmt = !r.state.IsStmt + + case lnsSetBasicBlock: + r.state.BasicBlock = true + + case lnsConstAddPC: + r.advancePC((255 - r.opcodeBase) / r.lineRange) + + case lnsFixedAdvancePC: + r.state.Address += uint64(r.buf.uint16()) + + // DWARF3 standard opcodes [DWARF3 6.2.5.2] + case lnsSetPrologueEnd: + r.state.PrologueEnd = true + + case lnsSetEpilogueBegin: + r.state.EpilogueBegin = true + + case lnsSetISA: + r.state.ISA = int(r.buf.uint()) + + default: + // Unhandled standard opcode. Skip the number of + // arguments that the prologue says this opcode has. + for i := 0; i < r.opcodeLengths[opcode]; i++ { + r.buf.uint() + } + } + return false + +emit: + *entry = r.state + r.state.BasicBlock = false + r.state.PrologueEnd = false + r.state.EpilogueBegin = false + r.state.Discriminator = 0 + return true +} + +// advancePC advances "operation pointer" (the combination of Address +// and OpIndex) in r.state by opAdvance steps. +func (r *LineReader) advancePC(opAdvance int) { + opIndex := r.state.OpIndex + opAdvance + r.state.Address += uint64(r.minInstructionLength * (opIndex / r.maxOpsPerInstruction)) + r.state.OpIndex = opIndex % r.maxOpsPerInstruction +} + +// A LineReaderPos represents a position in a line table. +type LineReaderPos struct { + // off is the current offset in the DWARF line section. + off Offset + // numFileEntries is the length of fileEntries. + numFileEntries int + // state and fileIndex are the statement machine state at + // offset off. + state LineEntry + fileIndex int +} + +// Tell returns the current position in the line table. +func (r *LineReader) Tell() LineReaderPos { + return LineReaderPos{r.buf.off, len(r.fileEntries), r.state, r.fileIndex} +} + +// Seek restores the line table reader to a position returned by Tell. +// +// The argument pos must have been returned by a call to Tell on this +// line table. +func (r *LineReader) Seek(pos LineReaderPos) { + r.buf.off = pos.off + r.buf.data = r.section[r.buf.off:r.endOffset] + r.fileEntries = r.fileEntries[:pos.numFileEntries] + r.state = pos.state + r.fileIndex = pos.fileIndex +} + +// Reset repositions the line table reader at the beginning of the +// line table. +func (r *LineReader) Reset() { + // Reset buffer to the line number program offset. + r.buf.off = r.programOffset + r.buf.data = r.section[r.buf.off:r.endOffset] + + // Reset file entries list. + r.fileEntries = r.fileEntries[:r.initialFileEntries] + + // Reset line number program state. + r.resetState() +} + +// resetState resets r.state to its default values +func (r *LineReader) resetState() { + // Reset the state machine registers to the defaults given in + // [DWARF4 6.2.2]. + r.state = LineEntry{ + Address: 0, + OpIndex: 0, + File: nil, + Line: 1, + Column: 0, + IsStmt: r.defaultIsStmt, + BasicBlock: false, + PrologueEnd: false, + EpilogueBegin: false, + ISA: 0, + Discriminator: 0, + } + r.fileIndex = 1 + r.updateFile() +} + +// Files returns the file name table of this compilation unit as of +// the current position in the line table. The file name table may be +// referenced from attributes in this compilation unit such as +// AttrDeclFile. +// +// Entry 0 is always nil, since file index 0 represents "no file". +// +// The file name table of a compilation unit is not fixed. Files +// returns the file table as of the current position in the line +// table. This may contain more entries than the file table at an +// earlier position in the line table, though existing entries never +// change. +func (r *LineReader) Files() []*LineFile { + return r.fileEntries +} + +// ErrUnknownPC is the error returned by LineReader.ScanPC when the +// seek PC is not covered by any entry in the line table. +var ErrUnknownPC = errors.New("ErrUnknownPC") + +// SeekPC sets *entry to the LineEntry that includes pc and positions +// the reader on the next entry in the line table. If necessary, this +// will seek backwards to find pc. +// +// If pc is not covered by any entry in this line table, SeekPC +// returns ErrUnknownPC. In this case, *entry and the final seek +// position are unspecified. +// +// Note that DWARF line tables only permit sequential, forward scans. +// Hence, in the worst case, this takes time linear in the size of the +// line table. If the caller wishes to do repeated fast PC lookups, it +// should build an appropriate index of the line table. +func (r *LineReader) SeekPC(pc uint64, entry *LineEntry) error { + if err := r.Next(entry); err != nil { + return err + } + if entry.Address > pc { + // We're too far. Start at the beginning of the table. + r.Reset() + if err := r.Next(entry); err != nil { + return err + } + if entry.Address > pc { + // The whole table starts after pc. + r.Reset() + return ErrUnknownPC + } + } + + // Scan until we pass pc, then back up one. + for { + var next LineEntry + pos := r.Tell() + if err := r.Next(&next); err != nil { + if err == io.EOF { + return ErrUnknownPC + } + return err + } + if next.Address > pc { + if entry.EndSequence { + // pc is in a hole in the table. + return ErrUnknownPC + } + // entry is the desired entry. Back up the + // cursor to "next" and return success. + r.Seek(pos) + return nil + } + *entry = next + } +} + +// pathIsAbs reports whether path is an absolute path (or "full path +// name" in DWARF parlance). This is in "whatever form makes sense for +// the host system", so this accepts both UNIX-style and DOS-style +// absolute paths. We avoid the filepath package because we want this +// to behave the same regardless of our host system and because we +// don't know what system the paths came from. +func pathIsAbs(path string) bool { + _, path = splitDrive(path) + return len(path) > 0 && (path[0] == '/' || path[0] == '\\') +} + +// pathJoin joins dirname and filename. filename must be relative. +// DWARF paths can be UNIX-style or DOS-style, so this handles both. +func pathJoin(dirname, filename string) string { + if len(dirname) == 0 { + return filename + } + // dirname should be absolute, which means we can determine + // whether it's a DOS path reasonably reliably by looking for + // a drive letter or UNC path. + drive, dirname := splitDrive(dirname) + if drive == "" { + // UNIX-style path. + return path.Join(dirname, filename) + } + // DOS-style path. + drive2, filename := splitDrive(filename) + if drive2 != "" { + if !strings.EqualFold(drive, drive2) { + // Different drives. There's not much we can + // do here, so just ignore the directory. + return drive2 + filename + } + // Drives are the same. Ignore drive on filename. + } + if !(strings.HasSuffix(dirname, "/") || strings.HasSuffix(dirname, `\`)) && dirname != "" { + sep := `\` + if strings.HasPrefix(dirname, "/") { + sep = `/` + } + dirname += sep + } + return drive + dirname + filename +} + +// splitDrive splits the DOS drive letter or UNC share point from +// path, if any. path == drive + rest +func splitDrive(path string) (drive, rest string) { + if len(path) >= 2 && path[1] == ':' { + if c := path[0]; 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' { + return path[:2], path[2:] + } + } + if len(path) > 3 && (path[0] == '\\' || path[0] == '/') && (path[1] == '\\' || path[1] == '/') { + // Normalize the path so we can search for just \ below. + npath := strings.Replace(path, "/", `\`, -1) + // Get the host part, which must be non-empty. + slash1 := strings.IndexByte(npath[2:], '\\') + 2 + if slash1 > 2 { + // Get the mount-point part, which must be non-empty. + slash2 := strings.IndexByte(npath[slash1+1:], '\\') + slash1 + 1 + if slash2 > slash1 { + return path[:slash2], path[slash2:] + } + } + } + return "", path +} diff --git a/src/debug/dwarf/line_test.go b/src/debug/dwarf/line_test.go new file mode 100644 index 0000000..163fc3b --- /dev/null +++ b/src/debug/dwarf/line_test.go @@ -0,0 +1,420 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf_test + +import ( + . "debug/dwarf" + "io" + "strings" + "testing" +) + +var ( + file1C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.c"} + file1H = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.h"} + file2C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line2.c"} +) + +func TestLineELFGCC(t *testing.T) { + // Generated by: + // # gcc --version | head -n1 + // gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2 + // # gcc -g -o line-gcc.elf line*.c + + // Line table based on readelf --debug-dump=rawline,decodedline + want := []LineEntry{ + {Address: 0x40059d, File: file1H, Line: 2, IsStmt: true}, + {Address: 0x4005a5, File: file1H, Line: 2, IsStmt: true}, + {Address: 0x4005b4, File: file1H, Line: 5, IsStmt: true}, + {Address: 0x4005bd, File: file1H, Line: 6, IsStmt: true, Discriminator: 2}, + {Address: 0x4005c7, File: file1H, Line: 5, IsStmt: true, Discriminator: 2}, + {Address: 0x4005cb, File: file1H, Line: 5, IsStmt: false, Discriminator: 1}, + {Address: 0x4005d1, File: file1H, Line: 7, IsStmt: true}, + {Address: 0x4005e7, File: file1C, Line: 6, IsStmt: true}, + {Address: 0x4005eb, File: file1C, Line: 7, IsStmt: true}, + {Address: 0x4005f5, File: file1C, Line: 8, IsStmt: true}, + {Address: 0x4005ff, File: file1C, Line: 9, IsStmt: true}, + {Address: 0x400601, EndSequence: true}, + + {Address: 0x400601, File: file2C, Line: 4, IsStmt: true}, + {Address: 0x400605, File: file2C, Line: 5, IsStmt: true}, + {Address: 0x40060f, File: file2C, Line: 6, IsStmt: true}, + {Address: 0x400611, EndSequence: true}, + } + files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}} + + testLineTable(t, want, files, elfData(t, "testdata/line-gcc.elf")) +} + +func TestLineGCCWindows(t *testing.T) { + // Generated by: + // > gcc --version + // gcc (tdm64-1) 4.9.2 + // > gcc -g -o line-gcc-win.bin line1.c C:\workdir\go\src\debug\dwarf\testdata\line2.c + + toWindows := func(lf *LineFile) *LineFile { + lf2 := *lf + lf2.Name = strings.Replace(lf2.Name, "/home/austin/go.dev/", "C:\\workdir\\go\\", -1) + lf2.Name = strings.Replace(lf2.Name, "/", "\\", -1) + return &lf2 + } + file1C := toWindows(file1C) + file1H := toWindows(file1H) + file2C := toWindows(file2C) + + // Line table based on objdump --dwarf=rawline,decodedline + want := []LineEntry{ + {Address: 0x401530, File: file1H, Line: 2, IsStmt: true}, + {Address: 0x401538, File: file1H, Line: 5, IsStmt: true}, + {Address: 0x401541, File: file1H, Line: 6, IsStmt: true, Discriminator: 3}, + {Address: 0x40154b, File: file1H, Line: 5, IsStmt: true, Discriminator: 3}, + {Address: 0x40154f, File: file1H, Line: 5, IsStmt: false, Discriminator: 1}, + {Address: 0x401555, File: file1H, Line: 7, IsStmt: true}, + {Address: 0x40155b, File: file1C, Line: 6, IsStmt: true}, + {Address: 0x401563, File: file1C, Line: 6, IsStmt: true}, + {Address: 0x401568, File: file1C, Line: 7, IsStmt: true}, + {Address: 0x40156d, File: file1C, Line: 8, IsStmt: true}, + {Address: 0x401572, File: file1C, Line: 9, IsStmt: true}, + {Address: 0x401578, EndSequence: true}, + + {Address: 0x401580, File: file2C, Line: 4, IsStmt: true}, + {Address: 0x401588, File: file2C, Line: 5, IsStmt: true}, + {Address: 0x401595, File: file2C, Line: 6, IsStmt: true}, + {Address: 0x40159b, EndSequence: true}, + } + files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}} + + testLineTable(t, want, files, peData(t, "testdata/line-gcc-win.bin")) +} + +func TestLineELFClang(t *testing.T) { + // Generated by: + // # clang --version | head -n1 + // Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4) + // # clang -g -o line-clang.elf line*. + + want := []LineEntry{ + {Address: 0x400530, File: file1C, Line: 6, IsStmt: true}, + {Address: 0x400534, File: file1C, Line: 7, IsStmt: true, PrologueEnd: true}, + {Address: 0x400539, File: file1C, Line: 8, IsStmt: true}, + {Address: 0x400545, File: file1C, Line: 9, IsStmt: true}, + {Address: 0x400550, File: file1H, Line: 2, IsStmt: true}, + {Address: 0x400554, File: file1H, Line: 5, IsStmt: true, PrologueEnd: true}, + {Address: 0x400568, File: file1H, Line: 6, IsStmt: true}, + {Address: 0x400571, File: file1H, Line: 5, IsStmt: true}, + {Address: 0x400581, File: file1H, Line: 7, IsStmt: true}, + {Address: 0x400583, EndSequence: true}, + + {Address: 0x400590, File: file2C, Line: 4, IsStmt: true}, + {Address: 0x4005a0, File: file2C, Line: 5, IsStmt: true, PrologueEnd: true}, + {Address: 0x4005a7, File: file2C, Line: 6, IsStmt: true}, + {Address: 0x4005b0, EndSequence: true}, + } + files := [][]*LineFile{{nil, file1C, file1H}, {nil, file2C}} + + testLineTable(t, want, files, elfData(t, "testdata/line-clang.elf")) +} + +func TestLineRnglists(t *testing.T) { + // Test a newer file, generated by clang. + file := &LineFile{Name: "/usr/local/google/home/iant/foo.c"} + want := []LineEntry{ + {Address: 0x401020, File: file, Line: 12, IsStmt: true}, + {Address: 0x401020, File: file, Line: 13, Column: 12, IsStmt: true, PrologueEnd: true}, + {Address: 0x401022, File: file, Line: 13, Column: 7}, + {Address: 0x401024, File: file, Line: 17, Column: 1, IsStmt: true}, + {Address: 0x401027, File: file, Line: 16, Column: 10, IsStmt: true}, + {Address: 0x40102c, EndSequence: true}, + {Address: 0x401000, File: file, Line: 2, IsStmt: true}, + {Address: 0x401000, File: file, Line: 6, Column: 17, IsStmt: true, PrologueEnd: true}, + {Address: 0x401002, File: file, Line: 6, Column: 3}, + {Address: 0x401019, File: file, Line: 9, Column: 3, IsStmt: true}, + {Address: 0x40101a, File: file, Line: 0, Column: 3}, + {Address: 0x40101c, File: file, Line: 9, Column: 3}, + {Address: 0x40101d, EndSequence: true}, + } + files := [][]*LineFile{{file}} + + testLineTable(t, want, files, elfData(t, "testdata/rnglistx.elf")) +} + +func TestLineSeek(t *testing.T) { + d := elfData(t, "testdata/line-gcc.elf") + + // Get the line table for the first CU. + cu, err := d.Reader().Next() + if err != nil { + t.Fatal("d.Reader().Next:", err) + } + lr, err := d.LineReader(cu) + if err != nil { + t.Fatal("d.LineReader:", err) + } + + // Read entries forward. + var line LineEntry + var posTable []LineReaderPos + var table []LineEntry + for { + posTable = append(posTable, lr.Tell()) + + err := lr.Next(&line) + if err != nil { + if err == io.EOF { + break + } + t.Fatal("lr.Next:", err) + } + table = append(table, line) + } + + // Test that Reset returns to the first line. + lr.Reset() + if err := lr.Next(&line); err != nil { + t.Fatal("lr.Next after Reset failed:", err) + } else if line != table[0] { + t.Fatal("lr.Next after Reset returned", line, "instead of", table[0]) + } + + // Check that entries match when seeking backward. + for i := len(posTable) - 1; i >= 0; i-- { + lr.Seek(posTable[i]) + err := lr.Next(&line) + if i == len(posTable)-1 { + if err != io.EOF { + t.Fatal("expected io.EOF after seek to end, got", err) + } + } else if err != nil { + t.Fatal("lr.Next after seek to", posTable[i], "failed:", err) + } else if line != table[i] { + t.Fatal("lr.Next after seek to", posTable[i], "returned", line, "instead of", table[i]) + } + } + + // Check that seeking to a PC returns the right line. + if err := lr.SeekPC(table[0].Address-1, &line); err != ErrUnknownPC { + t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", table[0].Address-1, err) + } + for i, testLine := range table { + if testLine.EndSequence { + if err := lr.SeekPC(testLine.Address, &line); err != ErrUnknownPC { + t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", testLine.Address, err) + } + continue + } + + nextPC := table[i+1].Address + for pc := testLine.Address; pc < nextPC; pc++ { + if err := lr.SeekPC(pc, &line); err != nil { + t.Fatalf("lr.SeekPC to %#x failed: %v", pc, err) + } else if line != testLine { + t.Fatalf("lr.SeekPC to %#x returned %v instead of %v", pc, line, testLine) + } + } + } +} + +func testLineTable(t *testing.T, want []LineEntry, files [][]*LineFile, d *Data) { + // Get line table from d. + var got []LineEntry + dr := d.Reader() + for { + ent, err := dr.Next() + if err != nil { + t.Fatal("dr.Next:", err) + } else if ent == nil { + break + } + + if ent.Tag != TagCompileUnit { + dr.SkipChildren() + continue + } + + // Ignore system compilation units (this happens in + // the Windows binary). We'll still decode the line + // table, but won't check it. + name := ent.Val(AttrName).(string) + ignore := strings.HasPrefix(name, "C:/crossdev/") || strings.HasPrefix(name, "../../") + + // Decode CU's line table. + lr, err := d.LineReader(ent) + if err != nil { + t.Fatal("d.LineReader:", err) + } else if lr == nil { + continue + } + + for { + var line LineEntry + err := lr.Next(&line) + if err != nil { + if err == io.EOF { + break + } + t.Fatal("lr.Next:", err) + } + // Ignore sources from the Windows build environment. + if ignore { + continue + } + got = append(got, line) + } + + // Check file table. + if !ignore { + if !compareFiles(files[0], lr.Files()) { + t.Log("File tables do not match. Got:") + dumpFiles(t, lr.Files()) + t.Log("Want:") + dumpFiles(t, files[0]) + t.Fail() + } + files = files[1:] + } + } + + // Compare line tables. + if !compareLines(got, want) { + t.Log("Line tables do not match. Got:") + dumpLines(t, got) + t.Log("Want:") + dumpLines(t, want) + t.FailNow() + } +} + +func compareFiles(a, b []*LineFile) bool { + if len(a) != len(b) { + return false + } + for i := range a { + if a[i] == nil && b[i] == nil { + continue + } + if a[i] != nil && b[i] != nil && a[i].Name == b[i].Name { + continue + } + return false + } + return true +} + +func dumpFiles(t *testing.T, files []*LineFile) { + for i, f := range files { + name := "<nil>" + if f != nil { + name = f.Name + } + t.Logf(" %d %s", i, name) + } +} + +func compareLines(a, b []LineEntry) bool { + if len(a) != len(b) { + return false + } + + for i := range a { + al, bl := a[i], b[i] + // If both are EndSequence, then the only other valid + // field is Address. Otherwise, test equality of all + // fields. + if al.EndSequence && bl.EndSequence && al.Address == bl.Address { + continue + } + if al.File.Name != bl.File.Name { + return false + } + al.File = nil + bl.File = nil + if al != bl { + return false + } + } + return true +} + +func dumpLines(t *testing.T, lines []LineEntry) { + for _, l := range lines { + t.Logf(" %+v File:%+v", l, l.File) + } +} + +type joinTest struct { + dirname, filename string + path string +} + +var joinTests = []joinTest{ + {"a", "b", "a/b"}, + {"a", "", "a"}, + {"", "b", "b"}, + {"/a", "b", "/a/b"}, + {"/a/", "b", "/a/b"}, + + {`C:\Windows\`, `System32`, `C:\Windows\System32`}, + {`C:\Windows\`, ``, `C:\Windows\`}, + {`C:\`, `Windows`, `C:\Windows`}, + {`C:\Windows\`, `C:System32`, `C:\Windows\System32`}, + {`C:\Windows`, `a/b`, `C:\Windows\a/b`}, + {`\\host\share\`, `foo`, `\\host\share\foo`}, + {`\\host\share\`, `foo\bar`, `\\host\share\foo\bar`}, + {`//host/share/`, `foo/bar`, `//host/share/foo/bar`}, + + // Note: the Go compiler currently emits DWARF line table paths + // with '/' instead of '\' (see issues #19784, #36495). These + // tests are to cover cases that might come up for Windows Go + // binaries. + {`c:/workdir/go/src/x`, `y.go`, `c:/workdir/go/src/x/y.go`}, + {`d:/some/thing/`, `b.go`, `d:/some/thing/b.go`}, + {`e:\blah\`, `foo.c`, `e:\blah\foo.c`}, + + // The following are "best effort". We shouldn't see relative + // base directories in DWARF, but these test that pathJoin + // doesn't fail miserably if it sees one. + {`C:`, `a`, `C:a`}, + {`C:`, `a\b`, `C:a\b`}, + {`C:.`, `a`, `C:.\a`}, + {`C:a`, `b`, `C:a\b`}, +} + +func TestPathJoin(t *testing.T) { + for _, test := range joinTests { + got := PathJoin(test.dirname, test.filename) + if test.path != got { + t.Errorf("pathJoin(%q, %q) = %q, want %q", test.dirname, test.filename, got, test.path) + } + } +} + +func TestPathLineReaderMalformed(t *testing.T) { + // This test case drawn from issue #52354. What's happening + // here is that the stmtList attribute in the compilation + // unit is malformed (negative). + var aranges, frame, pubnames, ranges, str []byte + abbrev := []byte{0x10, 0x20, 0x20, 0x20, 0x21, 0x20, 0x10, 0x21, 0x61, + 0x0, 0x0, 0xff, 0x20, 0xff, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, + 0x20, 0x20, 0x20, 0x20, 0x20, 0x20} + info := []byte{0x0, 0x0, 0x0, 0x9, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0, + 0x20, 0x10, 0x10} + line := []byte{0x20} + Data0, err := New(abbrev, aranges, frame, info, line, pubnames, ranges, str) + if err != nil { + t.Fatalf("error unexpected: %v", err) + } + Reader0 := Data0.Reader() + Entry0, err := Reader0.Next() + if err != nil { + t.Fatalf("error unexpected: %v", err) + } + LineReader0, err := Data0.LineReader(Entry0) + if err == nil { + t.Fatalf("expected error") + } + if LineReader0 != nil { + t.Fatalf("expected nil line reader") + } +} diff --git a/src/debug/dwarf/open.go b/src/debug/dwarf/open.go new file mode 100644 index 0000000..994b726 --- /dev/null +++ b/src/debug/dwarf/open.go @@ -0,0 +1,140 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package dwarf provides access to DWARF debugging information loaded from +executable files, as defined in the DWARF 2.0 Standard at +http://dwarfstd.org/doc/dwarf-2.0.0.pdf. + +# Security + +This package is not designed to be hardened against adversarial inputs, and is +outside the scope of https://go.dev/security/policy. In particular, only basic +validation is done when parsing object files. As such, care should be taken when +parsing untrusted inputs, as parsing malformed files may consume significant +resources, or cause panics. +*/ +package dwarf + +import ( + "encoding/binary" + "errors" +) + +// Data represents the DWARF debugging information +// loaded from an executable file (for example, an ELF or Mach-O executable). +type Data struct { + // raw data + abbrev []byte + aranges []byte + frame []byte + info []byte + line []byte + pubnames []byte + ranges []byte + str []byte + + // New sections added in DWARF 5. + addr []byte + lineStr []byte + strOffsets []byte + rngLists []byte + + // parsed data + abbrevCache map[uint64]abbrevTable + bigEndian bool + order binary.ByteOrder + typeCache map[Offset]Type + typeSigs map[uint64]*typeUnit + unit []unit +} + +var errSegmentSelector = errors.New("non-zero segment_selector size not supported") + +// New returns a new Data object initialized from the given parameters. +// Rather than calling this function directly, clients should typically use +// the DWARF method of the File type of the appropriate package debug/elf, +// debug/macho, or debug/pe. +// +// The []byte arguments are the data from the corresponding debug section +// in the object file; for example, for an ELF object, abbrev is the contents of +// the ".debug_abbrev" section. +func New(abbrev, aranges, frame, info, line, pubnames, ranges, str []byte) (*Data, error) { + d := &Data{ + abbrev: abbrev, + aranges: aranges, + frame: frame, + info: info, + line: line, + pubnames: pubnames, + ranges: ranges, + str: str, + abbrevCache: make(map[uint64]abbrevTable), + typeCache: make(map[Offset]Type), + typeSigs: make(map[uint64]*typeUnit), + } + + // Sniff .debug_info to figure out byte order. + // 32-bit DWARF: 4 byte length, 2 byte version. + // 64-bit DWARf: 4 bytes of 0xff, 8 byte length, 2 byte version. + if len(d.info) < 6 { + return nil, DecodeError{"info", Offset(len(d.info)), "too short"} + } + offset := 4 + if d.info[0] == 0xff && d.info[1] == 0xff && d.info[2] == 0xff && d.info[3] == 0xff { + if len(d.info) < 14 { + return nil, DecodeError{"info", Offset(len(d.info)), "too short"} + } + offset = 12 + } + // Fetch the version, a tiny 16-bit number (1, 2, 3, 4, 5). + x, y := d.info[offset], d.info[offset+1] + switch { + case x == 0 && y == 0: + return nil, DecodeError{"info", 4, "unsupported version 0"} + case x == 0: + d.bigEndian = true + d.order = binary.BigEndian + case y == 0: + d.bigEndian = false + d.order = binary.LittleEndian + default: + return nil, DecodeError{"info", 4, "cannot determine byte order"} + } + + u, err := d.parseUnits() + if err != nil { + return nil, err + } + d.unit = u + return d, nil +} + +// AddTypes will add one .debug_types section to the DWARF data. A +// typical object with DWARF version 4 debug info will have multiple +// .debug_types sections. The name is used for error reporting only, +// and serves to distinguish one .debug_types section from another. +func (d *Data) AddTypes(name string, types []byte) error { + return d.parseTypes(name, types) +} + +// AddSection adds another DWARF section by name. The name should be a +// DWARF section name such as ".debug_addr", ".debug_str_offsets", and +// so forth. This approach is used for new DWARF sections added in +// DWARF 5 and later. +func (d *Data) AddSection(name string, contents []byte) error { + var err error + switch name { + case ".debug_addr": + d.addr = contents + case ".debug_line_str": + d.lineStr = contents + case ".debug_str_offsets": + d.strOffsets = contents + case ".debug_rnglists": + d.rngLists = contents + } + // Just ignore names that we don't yet support. + return err +} diff --git a/src/debug/dwarf/tag_string.go b/src/debug/dwarf/tag_string.go new file mode 100644 index 0000000..b79ea17 --- /dev/null +++ b/src/debug/dwarf/tag_string.go @@ -0,0 +1,119 @@ +// Code generated by "stringer -type Tag -trimprefix=Tag"; DO NOT EDIT. + +package dwarf + +import "strconv" + +func _() { + // An "invalid array index" compiler error signifies that the constant values have changed. + // Re-run the stringer command to generate them again. + var x [1]struct{} + _ = x[TagArrayType-1] + _ = x[TagClassType-2] + _ = x[TagEntryPoint-3] + _ = x[TagEnumerationType-4] + _ = x[TagFormalParameter-5] + _ = x[TagImportedDeclaration-8] + _ = x[TagLabel-10] + _ = x[TagLexDwarfBlock-11] + _ = x[TagMember-13] + _ = x[TagPointerType-15] + _ = x[TagReferenceType-16] + _ = x[TagCompileUnit-17] + _ = x[TagStringType-18] + _ = x[TagStructType-19] + _ = x[TagSubroutineType-21] + _ = x[TagTypedef-22] + _ = x[TagUnionType-23] + _ = x[TagUnspecifiedParameters-24] + _ = x[TagVariant-25] + _ = x[TagCommonDwarfBlock-26] + _ = x[TagCommonInclusion-27] + _ = x[TagInheritance-28] + _ = x[TagInlinedSubroutine-29] + _ = x[TagModule-30] + _ = x[TagPtrToMemberType-31] + _ = x[TagSetType-32] + _ = x[TagSubrangeType-33] + _ = x[TagWithStmt-34] + _ = x[TagAccessDeclaration-35] + _ = x[TagBaseType-36] + _ = x[TagCatchDwarfBlock-37] + _ = x[TagConstType-38] + _ = x[TagConstant-39] + _ = x[TagEnumerator-40] + _ = x[TagFileType-41] + _ = x[TagFriend-42] + _ = x[TagNamelist-43] + _ = x[TagNamelistItem-44] + _ = x[TagPackedType-45] + _ = x[TagSubprogram-46] + _ = x[TagTemplateTypeParameter-47] + _ = x[TagTemplateValueParameter-48] + _ = x[TagThrownType-49] + _ = x[TagTryDwarfBlock-50] + _ = x[TagVariantPart-51] + _ = x[TagVariable-52] + _ = x[TagVolatileType-53] + _ = x[TagDwarfProcedure-54] + _ = x[TagRestrictType-55] + _ = x[TagInterfaceType-56] + _ = x[TagNamespace-57] + _ = x[TagImportedModule-58] + _ = x[TagUnspecifiedType-59] + _ = x[TagPartialUnit-60] + _ = x[TagImportedUnit-61] + _ = x[TagMutableType-62] + _ = x[TagCondition-63] + _ = x[TagSharedType-64] + _ = x[TagTypeUnit-65] + _ = x[TagRvalueReferenceType-66] + _ = x[TagTemplateAlias-67] + _ = x[TagCoarrayType-68] + _ = x[TagGenericSubrange-69] + _ = x[TagDynamicType-70] + _ = x[TagAtomicType-71] + _ = x[TagCallSite-72] + _ = x[TagCallSiteParameter-73] + _ = x[TagSkeletonUnit-74] + _ = x[TagImmutableType-75] +} + +const ( + _Tag_name_0 = "ArrayTypeClassTypeEntryPointEnumerationTypeFormalParameter" + _Tag_name_1 = "ImportedDeclaration" + _Tag_name_2 = "LabelLexDwarfBlock" + _Tag_name_3 = "Member" + _Tag_name_4 = "PointerTypeReferenceTypeCompileUnitStringTypeStructType" + _Tag_name_5 = "SubroutineTypeTypedefUnionTypeUnspecifiedParametersVariantCommonDwarfBlockCommonInclusionInheritanceInlinedSubroutineModulePtrToMemberTypeSetTypeSubrangeTypeWithStmtAccessDeclarationBaseTypeCatchDwarfBlockConstTypeConstantEnumeratorFileTypeFriendNamelistNamelistItemPackedTypeSubprogramTemplateTypeParameterTemplateValueParameterThrownTypeTryDwarfBlockVariantPartVariableVolatileTypeDwarfProcedureRestrictTypeInterfaceTypeNamespaceImportedModuleUnspecifiedTypePartialUnitImportedUnitMutableTypeConditionSharedTypeTypeUnitRvalueReferenceTypeTemplateAliasCoarrayTypeGenericSubrangeDynamicTypeAtomicTypeCallSiteCallSiteParameterSkeletonUnitImmutableType" +) + +var ( + _Tag_index_0 = [...]uint8{0, 9, 18, 28, 43, 58} + _Tag_index_2 = [...]uint8{0, 5, 18} + _Tag_index_4 = [...]uint8{0, 11, 24, 35, 45, 55} + _Tag_index_5 = [...]uint16{0, 14, 21, 30, 51, 58, 74, 89, 100, 117, 123, 138, 145, 157, 165, 182, 190, 205, 214, 222, 232, 240, 246, 254, 266, 276, 286, 307, 329, 339, 352, 363, 371, 383, 397, 409, 422, 431, 445, 460, 471, 483, 494, 503, 513, 521, 540, 553, 564, 579, 590, 600, 608, 625, 637, 650} +) + +func (i Tag) String() string { + switch { + case 1 <= i && i <= 5: + i -= 1 + return _Tag_name_0[_Tag_index_0[i]:_Tag_index_0[i+1]] + case i == 8: + return _Tag_name_1 + case 10 <= i && i <= 11: + i -= 10 + return _Tag_name_2[_Tag_index_2[i]:_Tag_index_2[i+1]] + case i == 13: + return _Tag_name_3 + case 15 <= i && i <= 19: + i -= 15 + return _Tag_name_4[_Tag_index_4[i]:_Tag_index_4[i+1]] + case 21 <= i && i <= 75: + i -= 21 + return _Tag_name_5[_Tag_index_5[i]:_Tag_index_5[i+1]] + default: + return "Tag(" + strconv.FormatInt(int64(i), 10) + ")" + } +} diff --git a/src/debug/dwarf/testdata/bitfields.c b/src/debug/dwarf/testdata/bitfields.c new file mode 100644 index 0000000..0583333 --- /dev/null +++ b/src/debug/dwarf/testdata/bitfields.c @@ -0,0 +1,17 @@ +// Copyright 2022 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Linux ELF: +gcc -gdwarf-4 -m64 -c bitfields.c -o bitfields.elf4 +*/ + +typedef struct another_struct { + unsigned short quix; + int xyz[0]; + unsigned x:1; + long long array[40]; +} t_another_struct; +t_another_struct q2; + diff --git a/src/debug/dwarf/testdata/bitfields.elf4 b/src/debug/dwarf/testdata/bitfields.elf4 Binary files differnew file mode 100644 index 0000000..2e06e68 --- /dev/null +++ b/src/debug/dwarf/testdata/bitfields.elf4 diff --git a/src/debug/dwarf/testdata/cppunsuptypes.cc b/src/debug/dwarf/testdata/cppunsuptypes.cc new file mode 100644 index 0000000..e9281c7 --- /dev/null +++ b/src/debug/dwarf/testdata/cppunsuptypes.cc @@ -0,0 +1,34 @@ +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// cppunsuptypes.elf built with g++ 7.3 +// g++ -g -c -o cppunsuptypes.elf cppunsuptypes.cc + +int i = 3; +double d = 3; + +// anonymous reference type +int &culprit = i; + +// named reference type +typedef double &dref; +dref dr = d; + +// incorporated into another type +typedef struct { + dref q; + int &r; +} hasrefs; + +hasrefs hr = { d, i }; + +// This code is intended to trigger a DWARF "pointer to member" type DIE +struct CS { int dm; }; + +int foo() +{ + int CS::* pdm = &CS::dm; + CS cs = {42}; + return cs.*pdm; +} diff --git a/src/debug/dwarf/testdata/cppunsuptypes.elf b/src/debug/dwarf/testdata/cppunsuptypes.elf Binary files differnew file mode 100644 index 0000000..e955512 --- /dev/null +++ b/src/debug/dwarf/testdata/cppunsuptypes.elf diff --git a/src/debug/dwarf/testdata/cycle.c b/src/debug/dwarf/testdata/cycle.c new file mode 100644 index 0000000..a0b53df --- /dev/null +++ b/src/debug/dwarf/testdata/cycle.c @@ -0,0 +1,7 @@ +typedef struct aaa *AAA; +typedef AAA BBB; +struct aaa { BBB val; }; + +AAA x(void) { + return (AAA)0; +} diff --git a/src/debug/dwarf/testdata/cycle.elf b/src/debug/dwarf/testdata/cycle.elf Binary files differnew file mode 100644 index 0000000..e0b66ca --- /dev/null +++ b/src/debug/dwarf/testdata/cycle.elf diff --git a/src/debug/dwarf/testdata/debug_rnglists b/src/debug/dwarf/testdata/debug_rnglists Binary files differnew file mode 100644 index 0000000..985ec6c --- /dev/null +++ b/src/debug/dwarf/testdata/debug_rnglists diff --git a/src/debug/dwarf/testdata/line-clang-dwarf5.elf b/src/debug/dwarf/testdata/line-clang-dwarf5.elf Binary files differnew file mode 100644 index 0000000..7b80c9c --- /dev/null +++ b/src/debug/dwarf/testdata/line-clang-dwarf5.elf diff --git a/src/debug/dwarf/testdata/line-clang.elf b/src/debug/dwarf/testdata/line-clang.elf Binary files differnew file mode 100644 index 0000000..b63cc78 --- /dev/null +++ b/src/debug/dwarf/testdata/line-clang.elf diff --git a/src/debug/dwarf/testdata/line-gcc-dwarf5.elf b/src/debug/dwarf/testdata/line-gcc-dwarf5.elf Binary files differnew file mode 100644 index 0000000..34ce17c --- /dev/null +++ b/src/debug/dwarf/testdata/line-gcc-dwarf5.elf diff --git a/src/debug/dwarf/testdata/line-gcc-win.bin b/src/debug/dwarf/testdata/line-gcc-win.bin Binary files differnew file mode 100644 index 0000000..583ad44 --- /dev/null +++ b/src/debug/dwarf/testdata/line-gcc-win.bin diff --git a/src/debug/dwarf/testdata/line-gcc.elf b/src/debug/dwarf/testdata/line-gcc.elf Binary files differnew file mode 100644 index 0000000..50500a8 --- /dev/null +++ b/src/debug/dwarf/testdata/line-gcc.elf diff --git a/src/debug/dwarf/testdata/line1.c b/src/debug/dwarf/testdata/line1.c new file mode 100644 index 0000000..f358647 --- /dev/null +++ b/src/debug/dwarf/testdata/line1.c @@ -0,0 +1,9 @@ +#include "line1.h" + +void f2(); + +int main() +{ + f1(); + f2(); +} diff --git a/src/debug/dwarf/testdata/line1.h b/src/debug/dwarf/testdata/line1.h new file mode 100644 index 0000000..974d4c8 --- /dev/null +++ b/src/debug/dwarf/testdata/line1.h @@ -0,0 +1,7 @@ +static void f1() +{ + char buf[10]; + int i; + for(i = 0; i < 10; i++) + buf[i] = 1; +} diff --git a/src/debug/dwarf/testdata/line2.c b/src/debug/dwarf/testdata/line2.c new file mode 100644 index 0000000..38d8998 --- /dev/null +++ b/src/debug/dwarf/testdata/line2.c @@ -0,0 +1,6 @@ +#include <stdio.h> + +void f2() +{ + printf("hello\n"); +} diff --git a/src/debug/dwarf/testdata/ranges.c b/src/debug/dwarf/testdata/ranges.c new file mode 100644 index 0000000..2f208e5 --- /dev/null +++ b/src/debug/dwarf/testdata/ranges.c @@ -0,0 +1,25 @@ +// gcc -g -O2 -freorder-blocks-and-partition + +const char *arr[10000]; +const char *hot = "hot"; +const char *cold = "cold"; + +__attribute__((noinline)) +void fn(int path) { + int i; + + if (path) { + for (i = 0; i < sizeof arr / sizeof arr[0]; i++) { + arr[i] = hot; + } + } else { + for (i = 0; i < sizeof arr / sizeof arr[0]; i++) { + arr[i] = cold; + } + } +} + +int main(int argc, char *argv[]) { + fn(argc); + return 0; +} diff --git a/src/debug/dwarf/testdata/ranges.elf b/src/debug/dwarf/testdata/ranges.elf Binary files differnew file mode 100755 index 0000000..7f54138 --- /dev/null +++ b/src/debug/dwarf/testdata/ranges.elf diff --git a/src/debug/dwarf/testdata/rnglistx.c b/src/debug/dwarf/testdata/rnglistx.c new file mode 100644 index 0000000..8770435 --- /dev/null +++ b/src/debug/dwarf/testdata/rnglistx.c @@ -0,0 +1,19 @@ +// clang -gdwarf-5 -O2 -nostdlib + +__attribute__((noinline, cold)) +static int sum(int i) { + int j, s; + + s = 0; + for (j = 0; j < i; j++) { + s += j * i; + } + return s; +} + +int main(int argc, char** argv) { + if (argc == 0) { + return 0; + } + return sum(argc); +} diff --git a/src/debug/dwarf/testdata/rnglistx.elf b/src/debug/dwarf/testdata/rnglistx.elf Binary files differnew file mode 100755 index 0000000..c2d7f55 --- /dev/null +++ b/src/debug/dwarf/testdata/rnglistx.elf diff --git a/src/debug/dwarf/testdata/split.c b/src/debug/dwarf/testdata/split.c new file mode 100644 index 0000000..0ef3427 --- /dev/null +++ b/src/debug/dwarf/testdata/split.c @@ -0,0 +1,5 @@ +// gcc -gsplit-dwarf split.c -o split.elf + +int main() +{ +} diff --git a/src/debug/dwarf/testdata/split.elf b/src/debug/dwarf/testdata/split.elf Binary files differnew file mode 100644 index 0000000..99ee2c2 --- /dev/null +++ b/src/debug/dwarf/testdata/split.elf diff --git a/src/debug/dwarf/testdata/typedef.c b/src/debug/dwarf/testdata/typedef.c new file mode 100644 index 0000000..3e7e008 --- /dev/null +++ b/src/debug/dwarf/testdata/typedef.c @@ -0,0 +1,86 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Linux ELF: +gcc -gdwarf-2 -m64 -c typedef.c && gcc -gdwarf-2 -m64 -o typedef.elf typedef.o + +OS X Mach-O: +gcc -gdwarf-2 -m64 -c typedef.c -o typedef.macho +gcc -gdwarf-4 -m64 -c typedef.c -o typedef.macho4 +*/ +#include <complex.h> + +typedef volatile int* t_ptr_volatile_int; +typedef const char *t_ptr_const_char; +typedef long t_long; +typedef unsigned short t_ushort; +typedef int t_func_int_of_float_double(float, double); +typedef int (*t_ptr_func_int_of_float_double)(float, double); +typedef int (*t_ptr_func_int_of_float_complex)(float complex); +typedef int (*t_ptr_func_int_of_double_complex)(double complex); +typedef int (*t_ptr_func_int_of_long_double_complex)(long double complex); +typedef int *t_func_ptr_int_of_char_schar_uchar(char, signed char, unsigned char); +typedef void t_func_void_of_char(char); +typedef void t_func_void_of_void(void); +typedef void t_func_void_of_ptr_char_dots(char*, ...); +typedef struct my_struct { + volatile int vi; + char x : 1; + int y : 4; + int z[0]; + long long array[40]; + int zz[0]; +} t_my_struct; +typedef struct my_struct1 { + int zz [1]; +} t_my_struct1; +typedef union my_union { + volatile int vi; + char x : 1; + int y : 4; + long long array[40]; +} t_my_union; +typedef enum my_enum { + e1 = 1, + e2 = 2, + e3 = -5, + e4 = 1000000000000000LL, +} t_my_enum; + +typedef struct list t_my_list; +struct list { + short val; + t_my_list *next; +}; + +typedef struct tree { + struct tree *left, *right; + unsigned long long val; +} t_my_tree; + +t_ptr_volatile_int *a2; +t_ptr_const_char **a3a; +t_long *a4; +t_ushort *a5; +t_func_int_of_float_double *a6; +t_ptr_func_int_of_float_double *a7; +t_func_ptr_int_of_char_schar_uchar *a8; +t_func_void_of_char *a9; +t_func_void_of_void *a10; +t_func_void_of_ptr_char_dots *a11; +t_my_struct *a12; +t_my_struct1 *a12a; +t_my_union *a12b; +t_my_enum *a13; +t_my_list *a14; +t_my_tree *a15; +t_ptr_func_int_of_float_complex *a16; +t_ptr_func_int_of_double_complex *a17; +t_ptr_func_int_of_long_double_complex *a18; + +int main() +{ + return 0; +} diff --git a/src/debug/dwarf/testdata/typedef.elf b/src/debug/dwarf/testdata/typedef.elf Binary files differnew file mode 100755 index 0000000..b2062d2 --- /dev/null +++ b/src/debug/dwarf/testdata/typedef.elf diff --git a/src/debug/dwarf/testdata/typedef.elf4 b/src/debug/dwarf/testdata/typedef.elf4 Binary files differnew file mode 100644 index 0000000..3d5a5a1 --- /dev/null +++ b/src/debug/dwarf/testdata/typedef.elf4 diff --git a/src/debug/dwarf/testdata/typedef.elf5 b/src/debug/dwarf/testdata/typedef.elf5 Binary files differnew file mode 100644 index 0000000..aec48f6 --- /dev/null +++ b/src/debug/dwarf/testdata/typedef.elf5 diff --git a/src/debug/dwarf/testdata/typedef.macho b/src/debug/dwarf/testdata/typedef.macho Binary files differnew file mode 100644 index 0000000..f75afcc --- /dev/null +++ b/src/debug/dwarf/testdata/typedef.macho diff --git a/src/debug/dwarf/testdata/typedef.macho4 b/src/debug/dwarf/testdata/typedef.macho4 Binary files differnew file mode 100644 index 0000000..093ff37 --- /dev/null +++ b/src/debug/dwarf/testdata/typedef.macho4 diff --git a/src/debug/dwarf/type.go b/src/debug/dwarf/type.go new file mode 100644 index 0000000..a95c4c7 --- /dev/null +++ b/src/debug/dwarf/type.go @@ -0,0 +1,870 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// DWARF type information structures. +// The format is heavily biased toward C, but for simplicity +// the String methods use a pseudo-Go syntax. + +package dwarf + +import "strconv" + +// A Type conventionally represents a pointer to any of the +// specific Type structures (CharType, StructType, etc.). +type Type interface { + Common() *CommonType + String() string + Size() int64 +} + +// A CommonType holds fields common to multiple types. +// If a field is not known or not applicable for a given type, +// the zero value is used. +type CommonType struct { + ByteSize int64 // size of value of this type, in bytes + Name string // name that can be used to refer to type +} + +func (c *CommonType) Common() *CommonType { return c } + +func (c *CommonType) Size() int64 { return c.ByteSize } + +// Basic types + +// A BasicType holds fields common to all basic types. +// +// See the documentation for StructField for more info on the interpretation of +// the BitSize/BitOffset/DataBitOffset fields. +type BasicType struct { + CommonType + BitSize int64 + BitOffset int64 + DataBitOffset int64 +} + +func (b *BasicType) Basic() *BasicType { return b } + +func (t *BasicType) String() string { + if t.Name != "" { + return t.Name + } + return "?" +} + +// A CharType represents a signed character type. +type CharType struct { + BasicType +} + +// A UcharType represents an unsigned character type. +type UcharType struct { + BasicType +} + +// An IntType represents a signed integer type. +type IntType struct { + BasicType +} + +// A UintType represents an unsigned integer type. +type UintType struct { + BasicType +} + +// A FloatType represents a floating point type. +type FloatType struct { + BasicType +} + +// A ComplexType represents a complex floating point type. +type ComplexType struct { + BasicType +} + +// A BoolType represents a boolean type. +type BoolType struct { + BasicType +} + +// An AddrType represents a machine address type. +type AddrType struct { + BasicType +} + +// An UnspecifiedType represents an implicit, unknown, ambiguous or nonexistent type. +type UnspecifiedType struct { + BasicType +} + +// qualifiers + +// A QualType represents a type that has the C/C++ "const", "restrict", or "volatile" qualifier. +type QualType struct { + CommonType + Qual string + Type Type +} + +func (t *QualType) String() string { return t.Qual + " " + t.Type.String() } + +func (t *QualType) Size() int64 { return t.Type.Size() } + +// An ArrayType represents a fixed size array type. +type ArrayType struct { + CommonType + Type Type + StrideBitSize int64 // if > 0, number of bits to hold each element + Count int64 // if == -1, an incomplete array, like char x[]. +} + +func (t *ArrayType) String() string { + return "[" + strconv.FormatInt(t.Count, 10) + "]" + t.Type.String() +} + +func (t *ArrayType) Size() int64 { + if t.Count == -1 { + return 0 + } + return t.Count * t.Type.Size() +} + +// A VoidType represents the C void type. +type VoidType struct { + CommonType +} + +func (t *VoidType) String() string { return "void" } + +// A PtrType represents a pointer type. +type PtrType struct { + CommonType + Type Type +} + +func (t *PtrType) String() string { return "*" + t.Type.String() } + +// A StructType represents a struct, union, or C++ class type. +type StructType struct { + CommonType + StructName string + Kind string // "struct", "union", or "class". + Field []*StructField + Incomplete bool // if true, struct, union, class is declared but not defined +} + +// A StructField represents a field in a struct, union, or C++ class type. +// +// # Bit Fields +// +// The BitSize, BitOffset, and DataBitOffset fields describe the bit +// size and offset of data members declared as bit fields in C/C++ +// struct/union/class types. +// +// BitSize is the number of bits in the bit field. +// +// DataBitOffset, if non-zero, is the number of bits from the start of +// the enclosing entity (e.g. containing struct/class/union) to the +// start of the bit field. This corresponds to the DW_AT_data_bit_offset +// DWARF attribute that was introduced in DWARF 4. +// +// BitOffset, if non-zero, is the number of bits between the most +// significant bit of the storage unit holding the bit field to the +// most significant bit of the bit field. Here "storage unit" is the +// type name before the bit field (for a field "unsigned x:17", the +// storage unit is "unsigned"). BitOffset values can vary depending on +// the endianness of the system. BitOffset corresponds to the +// DW_AT_bit_offset DWARF attribute that was deprecated in DWARF 4 and +// removed in DWARF 5. +// +// At most one of DataBitOffset and BitOffset will be non-zero; +// DataBitOffset/BitOffset will only be non-zero if BitSize is +// non-zero. Whether a C compiler uses one or the other +// will depend on compiler vintage and command line options. +// +// Here is an example of C/C++ bit field use, along with what to +// expect in terms of DWARF bit offset info. Consider this code: +// +// struct S { +// int q; +// int j:5; +// int k:6; +// int m:5; +// int n:8; +// } s; +// +// For the code above, one would expect to see the following for +// DW_AT_bit_offset values (using GCC 8): +// +// Little | Big +// Endian | Endian +// | +// "j": 27 | 0 +// "k": 21 | 5 +// "m": 16 | 11 +// "n": 8 | 16 +// +// Note that in the above the offsets are purely with respect to the +// containing storage unit for j/k/m/n -- these values won't vary based +// on the size of prior data members in the containing struct. +// +// If the compiler emits DW_AT_data_bit_offset, the expected values +// would be: +// +// "j": 32 +// "k": 37 +// "m": 43 +// "n": 48 +// +// Here the value 32 for "j" reflects the fact that the bit field is +// preceded by other data members (recall that DW_AT_data_bit_offset +// values are relative to the start of the containing struct). Hence +// DW_AT_data_bit_offset values can be quite large for structs with +// many fields. +// +// DWARF also allow for the possibility of base types that have +// non-zero bit size and bit offset, so this information is also +// captured for base types, but it is worth noting that it is not +// possible to trigger this behavior using mainstream languages. +type StructField struct { + Name string + Type Type + ByteOffset int64 + ByteSize int64 // usually zero; use Type.Size() for normal fields + BitOffset int64 + DataBitOffset int64 + BitSize int64 // zero if not a bit field +} + +func (t *StructType) String() string { + if t.StructName != "" { + return t.Kind + " " + t.StructName + } + return t.Defn() +} + +func (f *StructField) bitOffset() int64 { + if f.BitOffset != 0 { + return f.BitOffset + } + return f.DataBitOffset +} + +func (t *StructType) Defn() string { + s := t.Kind + if t.StructName != "" { + s += " " + t.StructName + } + if t.Incomplete { + s += " /*incomplete*/" + return s + } + s += " {" + for i, f := range t.Field { + if i > 0 { + s += "; " + } + s += f.Name + " " + f.Type.String() + s += "@" + strconv.FormatInt(f.ByteOffset, 10) + if f.BitSize > 0 { + s += " : " + strconv.FormatInt(f.BitSize, 10) + s += "@" + strconv.FormatInt(f.bitOffset(), 10) + } + } + s += "}" + return s +} + +// An EnumType represents an enumerated type. +// The only indication of its native integer type is its ByteSize +// (inside CommonType). +type EnumType struct { + CommonType + EnumName string + Val []*EnumValue +} + +// An EnumValue represents a single enumeration value. +type EnumValue struct { + Name string + Val int64 +} + +func (t *EnumType) String() string { + s := "enum" + if t.EnumName != "" { + s += " " + t.EnumName + } + s += " {" + for i, v := range t.Val { + if i > 0 { + s += "; " + } + s += v.Name + "=" + strconv.FormatInt(v.Val, 10) + } + s += "}" + return s +} + +// A FuncType represents a function type. +type FuncType struct { + CommonType + ReturnType Type + ParamType []Type +} + +func (t *FuncType) String() string { + s := "func(" + for i, t := range t.ParamType { + if i > 0 { + s += ", " + } + s += t.String() + } + s += ")" + if t.ReturnType != nil { + s += " " + t.ReturnType.String() + } + return s +} + +// A DotDotDotType represents the variadic ... function parameter. +type DotDotDotType struct { + CommonType +} + +func (t *DotDotDotType) String() string { return "..." } + +// A TypedefType represents a named type. +type TypedefType struct { + CommonType + Type Type +} + +func (t *TypedefType) String() string { return t.Name } + +func (t *TypedefType) Size() int64 { return t.Type.Size() } + +// An UnsupportedType is a placeholder returned in situations where we +// encounter a type that isn't supported. +type UnsupportedType struct { + CommonType + Tag Tag +} + +func (t *UnsupportedType) String() string { + if t.Name != "" { + return t.Name + } + return t.Name + "(unsupported type " + t.Tag.String() + ")" +} + +// typeReader is used to read from either the info section or the +// types section. +type typeReader interface { + Seek(Offset) + Next() (*Entry, error) + clone() typeReader + offset() Offset + // AddressSize returns the size in bytes of addresses in the current + // compilation unit. + AddressSize() int +} + +// Type reads the type at off in the DWARF “info” section. +func (d *Data) Type(off Offset) (Type, error) { + return d.readType("info", d.Reader(), off, d.typeCache, nil) +} + +type typeFixer struct { + typedefs []*TypedefType + arraytypes []*Type +} + +func (tf *typeFixer) recordArrayType(t *Type) { + if t == nil { + return + } + _, ok := (*t).(*ArrayType) + if ok { + tf.arraytypes = append(tf.arraytypes, t) + } +} + +func (tf *typeFixer) apply() { + for _, t := range tf.typedefs { + t.Common().ByteSize = t.Type.Size() + } + for _, t := range tf.arraytypes { + zeroArray(t) + } +} + +// readType reads a type from r at off of name. It adds types to the +// type cache, appends new typedef types to typedefs, and computes the +// sizes of types. Callers should pass nil for typedefs; this is used +// for internal recursion. +func (d *Data) readType(name string, r typeReader, off Offset, typeCache map[Offset]Type, fixups *typeFixer) (Type, error) { + if t, ok := typeCache[off]; ok { + return t, nil + } + r.Seek(off) + e, err := r.Next() + if err != nil { + return nil, err + } + addressSize := r.AddressSize() + if e == nil || e.Offset != off { + return nil, DecodeError{name, off, "no type at offset"} + } + + // If this is the root of the recursion, prepare to resolve + // typedef sizes and perform other fixups once the recursion is + // done. This must be done after the type graph is constructed + // because it may need to resolve cycles in a different order than + // readType encounters them. + if fixups == nil { + var fixer typeFixer + defer func() { + fixer.apply() + }() + fixups = &fixer + } + + // Parse type from Entry. + // Must always set typeCache[off] before calling + // d.readType recursively, to handle circular types correctly. + var typ Type + + nextDepth := 0 + + // Get next child; set err if error happens. + next := func() *Entry { + if !e.Children { + return nil + } + // Only return direct children. + // Skip over composite entries that happen to be nested + // inside this one. Most DWARF generators wouldn't generate + // such a thing, but clang does. + // See golang.org/issue/6472. + for { + kid, err1 := r.Next() + if err1 != nil { + err = err1 + return nil + } + if kid == nil { + err = DecodeError{name, r.offset(), "unexpected end of DWARF entries"} + return nil + } + if kid.Tag == 0 { + if nextDepth > 0 { + nextDepth-- + continue + } + return nil + } + if kid.Children { + nextDepth++ + } + if nextDepth > 0 { + continue + } + return kid + } + } + + // Get Type referred to by Entry's AttrType field. + // Set err if error happens. Not having a type is an error. + typeOf := func(e *Entry) Type { + tval := e.Val(AttrType) + var t Type + switch toff := tval.(type) { + case Offset: + if t, err = d.readType(name, r.clone(), toff, typeCache, fixups); err != nil { + return nil + } + case uint64: + if t, err = d.sigToType(toff); err != nil { + return nil + } + default: + // It appears that no Type means "void". + return new(VoidType) + } + return t + } + + switch e.Tag { + case TagArrayType: + // Multi-dimensional array. (DWARF v2 §5.4) + // Attributes: + // AttrType:subtype [required] + // AttrStrideSize: size in bits of each element of the array + // AttrByteSize: size of entire array + // Children: + // TagSubrangeType or TagEnumerationType giving one dimension. + // dimensions are in left to right order. + t := new(ArrayType) + typ = t + typeCache[off] = t + if t.Type = typeOf(e); err != nil { + goto Error + } + t.StrideBitSize, _ = e.Val(AttrStrideSize).(int64) + + // Accumulate dimensions, + var dims []int64 + for kid := next(); kid != nil; kid = next() { + // TODO(rsc): Can also be TagEnumerationType + // but haven't seen that in the wild yet. + switch kid.Tag { + case TagSubrangeType: + count, ok := kid.Val(AttrCount).(int64) + if !ok { + // Old binaries may have an upper bound instead. + count, ok = kid.Val(AttrUpperBound).(int64) + if ok { + count++ // Length is one more than upper bound. + } else if len(dims) == 0 { + count = -1 // As in x[]. + } + } + dims = append(dims, count) + case TagEnumerationType: + err = DecodeError{name, kid.Offset, "cannot handle enumeration type as array bound"} + goto Error + } + } + if len(dims) == 0 { + // LLVM generates this for x[]. + dims = []int64{-1} + } + + t.Count = dims[0] + for i := len(dims) - 1; i >= 1; i-- { + t.Type = &ArrayType{Type: t.Type, Count: dims[i]} + } + + case TagBaseType: + // Basic type. (DWARF v2 §5.1) + // Attributes: + // AttrName: name of base type in programming language of the compilation unit [required] + // AttrEncoding: encoding value for type (encFloat etc) [required] + // AttrByteSize: size of type in bytes [required] + // AttrBitOffset: bit offset of value within containing storage unit + // AttrDataBitOffset: bit offset of value within containing storage unit + // AttrBitSize: size in bits + // + // For most languages BitOffset/DataBitOffset/BitSize will not be present + // for base types. + name, _ := e.Val(AttrName).(string) + enc, ok := e.Val(AttrEncoding).(int64) + if !ok { + err = DecodeError{name, e.Offset, "missing encoding attribute for " + name} + goto Error + } + switch enc { + default: + err = DecodeError{name, e.Offset, "unrecognized encoding attribute value"} + goto Error + + case encAddress: + typ = new(AddrType) + case encBoolean: + typ = new(BoolType) + case encComplexFloat: + typ = new(ComplexType) + if name == "complex" { + // clang writes out 'complex' instead of 'complex float' or 'complex double'. + // clang also writes out a byte size that we can use to distinguish. + // See issue 8694. + switch byteSize, _ := e.Val(AttrByteSize).(int64); byteSize { + case 8: + name = "complex float" + case 16: + name = "complex double" + } + } + case encFloat: + typ = new(FloatType) + case encSigned: + typ = new(IntType) + case encUnsigned: + typ = new(UintType) + case encSignedChar: + typ = new(CharType) + case encUnsignedChar: + typ = new(UcharType) + } + typeCache[off] = typ + t := typ.(interface { + Basic() *BasicType + }).Basic() + t.Name = name + t.BitSize, _ = e.Val(AttrBitSize).(int64) + haveBitOffset := false + haveDataBitOffset := false + t.BitOffset, haveBitOffset = e.Val(AttrBitOffset).(int64) + t.DataBitOffset, haveDataBitOffset = e.Val(AttrDataBitOffset).(int64) + if haveBitOffset && haveDataBitOffset { + err = DecodeError{name, e.Offset, "duplicate bit offset attributes"} + goto Error + } + + case TagClassType, TagStructType, TagUnionType: + // Structure, union, or class type. (DWARF v2 §5.5) + // Attributes: + // AttrName: name of struct, union, or class + // AttrByteSize: byte size [required] + // AttrDeclaration: if true, struct/union/class is incomplete + // Children: + // TagMember to describe one member. + // AttrName: name of member [required] + // AttrType: type of member [required] + // AttrByteSize: size in bytes + // AttrBitOffset: bit offset within bytes for bit fields + // AttrDataBitOffset: field bit offset relative to struct start + // AttrBitSize: bit size for bit fields + // AttrDataMemberLoc: location within struct [required for struct, class] + // There is much more to handle C++, all ignored for now. + t := new(StructType) + typ = t + typeCache[off] = t + switch e.Tag { + case TagClassType: + t.Kind = "class" + case TagStructType: + t.Kind = "struct" + case TagUnionType: + t.Kind = "union" + } + t.StructName, _ = e.Val(AttrName).(string) + t.Incomplete = e.Val(AttrDeclaration) != nil + t.Field = make([]*StructField, 0, 8) + var lastFieldType *Type + var lastFieldBitSize int64 + var lastFieldByteOffset int64 + for kid := next(); kid != nil; kid = next() { + if kid.Tag != TagMember { + continue + } + f := new(StructField) + if f.Type = typeOf(kid); err != nil { + goto Error + } + switch loc := kid.Val(AttrDataMemberLoc).(type) { + case []byte: + // TODO: Should have original compilation + // unit here, not unknownFormat. + b := makeBuf(d, unknownFormat{}, "location", 0, loc) + if b.uint8() != opPlusUconst { + err = DecodeError{name, kid.Offset, "unexpected opcode"} + goto Error + } + f.ByteOffset = int64(b.uint()) + if b.err != nil { + err = b.err + goto Error + } + case int64: + f.ByteOffset = loc + } + + f.Name, _ = kid.Val(AttrName).(string) + f.ByteSize, _ = kid.Val(AttrByteSize).(int64) + haveBitOffset := false + haveDataBitOffset := false + f.BitOffset, haveBitOffset = kid.Val(AttrBitOffset).(int64) + f.DataBitOffset, haveDataBitOffset = kid.Val(AttrDataBitOffset).(int64) + if haveBitOffset && haveDataBitOffset { + err = DecodeError{name, e.Offset, "duplicate bit offset attributes"} + goto Error + } + f.BitSize, _ = kid.Val(AttrBitSize).(int64) + t.Field = append(t.Field, f) + + if lastFieldBitSize == 0 && lastFieldByteOffset == f.ByteOffset && t.Kind != "union" { + // Last field was zero width. Fix array length. + // (DWARF writes out 0-length arrays as if they were 1-length arrays.) + fixups.recordArrayType(lastFieldType) + } + lastFieldType = &f.Type + lastFieldByteOffset = f.ByteOffset + lastFieldBitSize = f.BitSize + } + if t.Kind != "union" { + b, ok := e.Val(AttrByteSize).(int64) + if ok && b == lastFieldByteOffset { + // Final field must be zero width. Fix array length. + fixups.recordArrayType(lastFieldType) + } + } + + case TagConstType, TagVolatileType, TagRestrictType: + // Type modifier (DWARF v2 §5.2) + // Attributes: + // AttrType: subtype + t := new(QualType) + typ = t + typeCache[off] = t + if t.Type = typeOf(e); err != nil { + goto Error + } + switch e.Tag { + case TagConstType: + t.Qual = "const" + case TagRestrictType: + t.Qual = "restrict" + case TagVolatileType: + t.Qual = "volatile" + } + + case TagEnumerationType: + // Enumeration type (DWARF v2 §5.6) + // Attributes: + // AttrName: enum name if any + // AttrByteSize: bytes required to represent largest value + // Children: + // TagEnumerator: + // AttrName: name of constant + // AttrConstValue: value of constant + t := new(EnumType) + typ = t + typeCache[off] = t + t.EnumName, _ = e.Val(AttrName).(string) + t.Val = make([]*EnumValue, 0, 8) + for kid := next(); kid != nil; kid = next() { + if kid.Tag == TagEnumerator { + f := new(EnumValue) + f.Name, _ = kid.Val(AttrName).(string) + f.Val, _ = kid.Val(AttrConstValue).(int64) + n := len(t.Val) + if n >= cap(t.Val) { + val := make([]*EnumValue, n, n*2) + copy(val, t.Val) + t.Val = val + } + t.Val = t.Val[0 : n+1] + t.Val[n] = f + } + } + + case TagPointerType: + // Type modifier (DWARF v2 §5.2) + // Attributes: + // AttrType: subtype [not required! void* has no AttrType] + // AttrAddrClass: address class [ignored] + t := new(PtrType) + typ = t + typeCache[off] = t + if e.Val(AttrType) == nil { + t.Type = &VoidType{} + break + } + t.Type = typeOf(e) + + case TagSubroutineType: + // Subroutine type. (DWARF v2 §5.7) + // Attributes: + // AttrType: type of return value if any + // AttrName: possible name of type [ignored] + // AttrPrototyped: whether used ANSI C prototype [ignored] + // Children: + // TagFormalParameter: typed parameter + // AttrType: type of parameter + // TagUnspecifiedParameter: final ... + t := new(FuncType) + typ = t + typeCache[off] = t + if t.ReturnType = typeOf(e); err != nil { + goto Error + } + t.ParamType = make([]Type, 0, 8) + for kid := next(); kid != nil; kid = next() { + var tkid Type + switch kid.Tag { + default: + continue + case TagFormalParameter: + if tkid = typeOf(kid); err != nil { + goto Error + } + case TagUnspecifiedParameters: + tkid = &DotDotDotType{} + } + t.ParamType = append(t.ParamType, tkid) + } + + case TagTypedef: + // Typedef (DWARF v2 §5.3) + // Attributes: + // AttrName: name [required] + // AttrType: type definition [required] + t := new(TypedefType) + typ = t + typeCache[off] = t + t.Name, _ = e.Val(AttrName).(string) + t.Type = typeOf(e) + + case TagUnspecifiedType: + // Unspecified type (DWARF v3 §5.2) + // Attributes: + // AttrName: name + t := new(UnspecifiedType) + typ = t + typeCache[off] = t + t.Name, _ = e.Val(AttrName).(string) + + default: + // This is some other type DIE that we're currently not + // equipped to handle. Return an abstract "unsupported type" + // object in such cases. + t := new(UnsupportedType) + typ = t + typeCache[off] = t + t.Tag = e.Tag + t.Name, _ = e.Val(AttrName).(string) + } + + if err != nil { + goto Error + } + + { + b, ok := e.Val(AttrByteSize).(int64) + if !ok { + b = -1 + switch t := typ.(type) { + case *TypedefType: + // Record that we need to resolve this + // type's size once the type graph is + // constructed. + fixups.typedefs = append(fixups.typedefs, t) + case *PtrType: + b = int64(addressSize) + } + } + typ.Common().ByteSize = b + } + return typ, nil + +Error: + // If the parse fails, take the type out of the cache + // so that the next call with this offset doesn't hit + // the cache and return success. + delete(typeCache, off) + return nil, err +} + +func zeroArray(t *Type) { + at := (*t).(*ArrayType) + if at.Type.Size() == 0 { + return + } + // Make a copy to avoid invalidating typeCache. + tt := *at + tt.Count = 0 + *t = &tt +} diff --git a/src/debug/dwarf/type_test.go b/src/debug/dwarf/type_test.go new file mode 100644 index 0000000..5858ef5 --- /dev/null +++ b/src/debug/dwarf/type_test.go @@ -0,0 +1,335 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf_test + +import ( + . "debug/dwarf" + "debug/elf" + "debug/macho" + "debug/pe" + "fmt" + "strconv" + "testing" +) + +var typedefTests = map[string]string{ + "t_ptr_volatile_int": "*volatile int", + "t_ptr_const_char": "*const char", + "t_long": "long int", + "t_ushort": "short unsigned int", + "t_func_int_of_float_double": "func(float, double) int", + "t_ptr_func_int_of_float_double": "*func(float, double) int", + "t_ptr_func_int_of_float_complex": "*func(complex float) int", + "t_ptr_func_int_of_double_complex": "*func(complex double) int", + "t_ptr_func_int_of_long_double_complex": "*func(complex long double) int", + "t_func_ptr_int_of_char_schar_uchar": "func(char, signed char, unsigned char) *int", + "t_func_void_of_char": "func(char) void", + "t_func_void_of_void": "func() void", + "t_func_void_of_ptr_char_dots": "func(*char, ...) void", + "t_my_struct": "struct my_struct {vi volatile int@0; x char@4 : 1@7; y int@4 : 4@27; z [0]int@8; array [40]long long int@8; zz [0]int@328}", + "t_my_struct1": "struct my_struct1 {zz [1]int@0}", + "t_my_union": "union my_union {vi volatile int@0; x char@0 : 1@7; y int@0 : 4@28; array [40]long long int@0}", + "t_my_enum": "enum my_enum {e1=1; e2=2; e3=-5; e4=1000000000000000}", + "t_my_list": "struct list {val short int@0; next *t_my_list@8}", + "t_my_tree": "struct tree {left *struct tree@0; right *struct tree@8; val long long unsigned int@16}", +} + +// As Apple converts gcc to a clang-based front end +// they keep breaking the DWARF output. This map lists the +// conversion from real answer to Apple answer. +var machoBug = map[string]string{ + "func(*char, ...) void": "func(*char) void", + "enum my_enum {e1=1; e2=2; e3=-5; e4=1000000000000000}": "enum my_enum {e1=1; e2=2; e3=-5; e4=-1530494976}", +} + +func elfData(t *testing.T, name string) *Data { + f, err := elf.Open(name) + if err != nil { + t.Fatal(err) + } + + d, err := f.DWARF() + if err != nil { + t.Fatal(err) + } + return d +} + +func machoData(t *testing.T, name string) *Data { + f, err := macho.Open(name) + if err != nil { + t.Fatal(err) + } + + d, err := f.DWARF() + if err != nil { + t.Fatal(err) + } + return d +} + +func peData(t *testing.T, name string) *Data { + f, err := pe.Open(name) + if err != nil { + t.Fatal(err) + } + + d, err := f.DWARF() + if err != nil { + t.Fatal(err) + } + return d +} + +func TestTypedefsELF(t *testing.T) { + testTypedefs(t, elfData(t, "testdata/typedef.elf"), "elf", typedefTests) +} + +func TestTypedefsMachO(t *testing.T) { + testTypedefs(t, machoData(t, "testdata/typedef.macho"), "macho", typedefTests) +} + +func TestTypedefsELFDwarf4(t *testing.T) { + testTypedefs(t, elfData(t, "testdata/typedef.elf4"), "elf", typedefTests) +} + +func testTypedefs(t *testing.T, d *Data, kind string, testcases map[string]string) { + r := d.Reader() + seen := make(map[string]bool) + for { + e, err := r.Next() + if err != nil { + t.Fatal("r.Next:", err) + } + if e == nil { + break + } + if e.Tag == TagTypedef { + typ, err := d.Type(e.Offset) + if err != nil { + t.Fatal("d.Type:", err) + } + t1 := typ.(*TypedefType) + var typstr string + if ts, ok := t1.Type.(*StructType); ok { + typstr = ts.Defn() + } else { + typstr = t1.Type.String() + } + + if want, ok := testcases[t1.Name]; ok { + if seen[t1.Name] { + t.Errorf("multiple definitions for %s", t1.Name) + } + seen[t1.Name] = true + if typstr != want && (kind != "macho" || typstr != machoBug[want]) { + t.Errorf("%s:\n\thave %s\n\twant %s", t1.Name, typstr, want) + } + } + } + if e.Tag != TagCompileUnit { + r.SkipChildren() + } + } + + for k := range testcases { + if !seen[k] { + t.Errorf("missing %s", k) + } + } +} + +func TestTypedefCycle(t *testing.T) { + // See issue #13039: reading a typedef cycle starting from a + // different place than the size needed to be computed from + // used to crash. + // + // cycle.elf built with GCC 4.8.4: + // gcc -g -c -o cycle.elf cycle.c + d := elfData(t, "testdata/cycle.elf") + r := d.Reader() + offsets := []Offset{} + for { + e, err := r.Next() + if err != nil { + t.Fatal("r.Next:", err) + } + if e == nil { + break + } + switch e.Tag { + case TagBaseType, TagTypedef, TagPointerType, TagStructType: + offsets = append(offsets, e.Offset) + } + } + + // Parse each type with a fresh type cache. + for _, offset := range offsets { + d := elfData(t, "testdata/cycle.elf") + _, err := d.Type(offset) + if err != nil { + t.Fatalf("d.Type(0x%x): %s", offset, err) + } + } +} + +var unsupportedTypeTests = []string{ + // varname:typename:string:size + "culprit::(unsupported type ReferenceType):8", + "pdm::(unsupported type PtrToMemberType):-1", +} + +func TestUnsupportedTypes(t *testing.T) { + // Issue 29601: + // When reading DWARF from C++ load modules, we can encounter + // oddball type DIEs. These will be returned as "UnsupportedType" + // objects; check to make sure this works properly. + d := elfData(t, "testdata/cppunsuptypes.elf") + r := d.Reader() + seen := make(map[string]bool) + for { + e, err := r.Next() + if err != nil { + t.Fatal("r.Next:", err) + } + if e == nil { + break + } + if e.Tag == TagVariable { + vname, _ := e.Val(AttrName).(string) + tAttr := e.Val(AttrType) + typOff, ok := tAttr.(Offset) + if !ok { + t.Errorf("variable at offset %v has no type", e.Offset) + continue + } + typ, err := d.Type(typOff) + if err != nil { + t.Errorf("err in type decode: %v\n", err) + continue + } + unsup, isok := typ.(*UnsupportedType) + if !isok { + continue + } + tag := vname + ":" + unsup.Name + ":" + unsup.String() + + ":" + strconv.FormatInt(unsup.Size(), 10) + seen[tag] = true + } + } + dumpseen := false + for _, v := range unsupportedTypeTests { + if !seen[v] { + t.Errorf("missing %s", v) + dumpseen = true + } + } + if dumpseen { + for k := range seen { + fmt.Printf("seen: %s\n", k) + } + } +} + +var expectedBitOffsets1 = map[string]string{ + "x": "S:1 DBO:32", + "y": "S:4 DBO:33", +} + +var expectedBitOffsets2 = map[string]string{ + "x": "S:1 BO:7", + "y": "S:4 BO:27", +} + +func TestBitOffsetsELF(t *testing.T) { + f := "testdata/typedef.elf" + testBitOffsets(t, elfData(t, f), f, expectedBitOffsets2) +} + +func TestBitOffsetsMachO(t *testing.T) { + f := "testdata/typedef.macho" + testBitOffsets(t, machoData(t, f), f, expectedBitOffsets2) +} + +func TestBitOffsetsMachO4(t *testing.T) { + f := "testdata/typedef.macho4" + testBitOffsets(t, machoData(t, f), f, expectedBitOffsets1) +} + +func TestBitOffsetsELFDwarf4(t *testing.T) { + f := "testdata/typedef.elf4" + testBitOffsets(t, elfData(t, f), f, expectedBitOffsets1) +} + +func TestBitOffsetsELFDwarf5(t *testing.T) { + f := "testdata/typedef.elf5" + testBitOffsets(t, elfData(t, f), f, expectedBitOffsets1) +} + +func testBitOffsets(t *testing.T, d *Data, tag string, expectedBitOffsets map[string]string) { + r := d.Reader() + for { + e, err := r.Next() + if err != nil { + t.Fatal("r.Next:", err) + } + if e == nil { + break + } + + if e.Tag == TagStructType { + typ, err := d.Type(e.Offset) + if err != nil { + t.Fatal("d.Type:", err) + } + + t1 := typ.(*StructType) + + bitInfoDump := func(f *StructField) string { + res := fmt.Sprintf("S:%d", f.BitSize) + if f.BitOffset != 0 { + res += fmt.Sprintf(" BO:%d", f.BitOffset) + } + if f.DataBitOffset != 0 { + res += fmt.Sprintf(" DBO:%d", f.DataBitOffset) + } + return res + } + + for _, field := range t1.Field { + // We're only testing for bitfields + if field.BitSize == 0 { + continue + } + got := bitInfoDump(field) + want := expectedBitOffsets[field.Name] + if got != want { + t.Errorf("%s: field %s in %s: got info %q want %q", tag, field.Name, t1.StructName, got, want) + } + } + } + if e.Tag != TagCompileUnit { + r.SkipChildren() + } + } +} + +var bitfieldTests = map[string]string{ + "t_another_struct": "struct another_struct {quix short unsigned int@0; xyz [0]int@4; x unsigned int@4 : 1@31; array [40]long long int@8}", +} + +// TestBitFieldZeroArrayIssue50685 checks to make sure that the DWARF +// type reading code doesn't get confused by the presence of a +// specifically-sized bitfield member immediately following a field +// whose type is a zero-length array. Prior to the fix for issue +// 50685, we would get this type for the case in testdata/bitfields.c: +// +// another_struct {quix short unsigned int@0; xyz [-1]int@4; x unsigned int@4 : 1@31; array [40]long long int@8} +// +// Note the "-1" for the xyz field, which should be zero. +func TestBitFieldZeroArrayIssue50685(t *testing.T) { + f := "testdata/bitfields.elf4" + testTypedefs(t, elfData(t, f), "elf", bitfieldTests) +} diff --git a/src/debug/dwarf/typeunit.go b/src/debug/dwarf/typeunit.go new file mode 100644 index 0000000..27aa078 --- /dev/null +++ b/src/debug/dwarf/typeunit.go @@ -0,0 +1,160 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf + +import ( + "fmt" + "strconv" +) + +// Parse the type units stored in a DWARF4 .debug_types section. Each +// type unit defines a single primary type and an 8-byte signature. +// Other sections may then use formRefSig8 to refer to the type. + +// The typeUnit format is a single type with a signature. It holds +// the same data as a compilation unit. +type typeUnit struct { + unit + toff Offset // Offset to signature type within data. + name string // Name of .debug_type section. + cache Type // Cache the type, nil to start. +} + +// Parse a .debug_types section. +func (d *Data) parseTypes(name string, types []byte) error { + b := makeBuf(d, unknownFormat{}, name, 0, types) + for len(b.data) > 0 { + base := b.off + n, dwarf64 := b.unitLength() + if n != Offset(uint32(n)) { + b.error("type unit length overflow") + return b.err + } + hdroff := b.off + vers := int(b.uint16()) + if vers != 4 { + b.error("unsupported DWARF version " + strconv.Itoa(vers)) + return b.err + } + var ao uint64 + if !dwarf64 { + ao = uint64(b.uint32()) + } else { + ao = b.uint64() + } + atable, err := d.parseAbbrev(ao, vers) + if err != nil { + return err + } + asize := b.uint8() + sig := b.uint64() + + var toff uint32 + if !dwarf64 { + toff = b.uint32() + } else { + to64 := b.uint64() + if to64 != uint64(uint32(to64)) { + b.error("type unit type offset overflow") + return b.err + } + toff = uint32(to64) + } + + boff := b.off + d.typeSigs[sig] = &typeUnit{ + unit: unit{ + base: base, + off: boff, + data: b.bytes(int(n - (b.off - hdroff))), + atable: atable, + asize: int(asize), + vers: vers, + is64: dwarf64, + }, + toff: Offset(toff), + name: name, + } + if b.err != nil { + return b.err + } + } + return nil +} + +// Return the type for a type signature. +func (d *Data) sigToType(sig uint64) (Type, error) { + tu := d.typeSigs[sig] + if tu == nil { + return nil, fmt.Errorf("no type unit with signature %v", sig) + } + if tu.cache != nil { + return tu.cache, nil + } + + b := makeBuf(d, tu, tu.name, tu.off, tu.data) + r := &typeUnitReader{d: d, tu: tu, b: b} + t, err := d.readType(tu.name, r, tu.toff, make(map[Offset]Type), nil) + if err != nil { + return nil, err + } + + tu.cache = t + return t, nil +} + +// typeUnitReader is a typeReader for a tagTypeUnit. +type typeUnitReader struct { + d *Data + tu *typeUnit + b buf + err error +} + +// Seek to a new position in the type unit. +func (tur *typeUnitReader) Seek(off Offset) { + tur.err = nil + doff := off - tur.tu.off + if doff < 0 || doff >= Offset(len(tur.tu.data)) { + tur.err = fmt.Errorf("%s: offset %d out of range; max %d", tur.tu.name, doff, len(tur.tu.data)) + return + } + tur.b = makeBuf(tur.d, tur.tu, tur.tu.name, off, tur.tu.data[doff:]) +} + +// AddressSize returns the size in bytes of addresses in the current type unit. +func (tur *typeUnitReader) AddressSize() int { + return tur.tu.unit.asize +} + +// Next reads the next Entry from the type unit. +func (tur *typeUnitReader) Next() (*Entry, error) { + if tur.err != nil { + return nil, tur.err + } + if len(tur.tu.data) == 0 { + return nil, nil + } + e := tur.b.entry(nil, tur.tu.atable, tur.tu.base, tur.tu.vers) + if tur.b.err != nil { + tur.err = tur.b.err + return nil, tur.err + } + return e, nil +} + +// clone returns a new reader for the type unit. +func (tur *typeUnitReader) clone() typeReader { + return &typeUnitReader{ + d: tur.d, + tu: tur.tu, + b: makeBuf(tur.d, tur.tu, tur.tu.name, tur.tu.off, tur.tu.data), + } +} + +// offset returns the current offset. +func (tur *typeUnitReader) offset() Offset { + return tur.b.off +} diff --git a/src/debug/dwarf/unit.go b/src/debug/dwarf/unit.go new file mode 100644 index 0000000..8b810d0 --- /dev/null +++ b/src/debug/dwarf/unit.go @@ -0,0 +1,137 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package dwarf + +import ( + "sort" + "strconv" +) + +// DWARF debug info is split into a sequence of compilation units. +// Each unit has its own abbreviation table and address size. + +type unit struct { + base Offset // byte offset of header within the aggregate info + off Offset // byte offset of data within the aggregate info + data []byte + atable abbrevTable + asize int + vers int + utype uint8 // DWARF 5 unit type + is64 bool // True for 64-bit DWARF format +} + +// Implement the dataFormat interface. + +func (u *unit) version() int { + return u.vers +} + +func (u *unit) dwarf64() (bool, bool) { + return u.is64, true +} + +func (u *unit) addrsize() int { + return u.asize +} + +func (d *Data) parseUnits() ([]unit, error) { + // Count units. + nunit := 0 + b := makeBuf(d, unknownFormat{}, "info", 0, d.info) + for len(b.data) > 0 { + len, _ := b.unitLength() + if len != Offset(uint32(len)) { + b.error("unit length overflow") + break + } + b.skip(int(len)) + if len > 0 { + nunit++ + } + } + if b.err != nil { + return nil, b.err + } + + // Again, this time writing them down. + b = makeBuf(d, unknownFormat{}, "info", 0, d.info) + units := make([]unit, nunit) + for i := range units { + u := &units[i] + u.base = b.off + var n Offset + if b.err != nil { + return nil, b.err + } + for n == 0 { + n, u.is64 = b.unitLength() + } + dataOff := b.off + vers := b.uint16() + if vers < 2 || vers > 5 { + b.error("unsupported DWARF version " + strconv.Itoa(int(vers))) + break + } + u.vers = int(vers) + if vers >= 5 { + u.utype = b.uint8() + u.asize = int(b.uint8()) + } + var abbrevOff uint64 + if u.is64 { + abbrevOff = b.uint64() + } else { + abbrevOff = uint64(b.uint32()) + } + atable, err := d.parseAbbrev(abbrevOff, u.vers) + if err != nil { + if b.err == nil { + b.err = err + } + break + } + u.atable = atable + if vers < 5 { + u.asize = int(b.uint8()) + } + + switch u.utype { + case utSkeleton, utSplitCompile: + b.uint64() // unit ID + case utType, utSplitType: + b.uint64() // type signature + if u.is64 { // type offset + b.uint64() + } else { + b.uint32() + } + } + + u.off = b.off + u.data = b.bytes(int(n - (b.off - dataOff))) + } + if b.err != nil { + return nil, b.err + } + return units, nil +} + +// offsetToUnit returns the index of the unit containing offset off. +// It returns -1 if no unit contains this offset. +func (d *Data) offsetToUnit(off Offset) int { + // Find the unit after off + next := sort.Search(len(d.unit), func(i int) bool { + return d.unit[i].off > off + }) + if next == 0 { + return -1 + } + u := &d.unit[next-1] + if u.off <= off && off < u.off+Offset(len(u.data)) { + return next - 1 + } + return -1 +} diff --git a/src/debug/elf/elf.go b/src/debug/elf/elf.go new file mode 100644 index 0000000..02cda16 --- /dev/null +++ b/src/debug/elf/elf.go @@ -0,0 +1,3478 @@ +/* + * ELF constants and data structures + * + * Derived from: + * $FreeBSD: src/sys/sys/elf32.h,v 1.8.14.1 2005/12/30 22:13:58 marcel Exp $ + * $FreeBSD: src/sys/sys/elf64.h,v 1.10.14.1 2005/12/30 22:13:58 marcel Exp $ + * $FreeBSD: src/sys/sys/elf_common.h,v 1.15.8.1 2005/12/30 22:13:58 marcel Exp $ + * $FreeBSD: src/sys/alpha/include/elf.h,v 1.14 2003/09/25 01:10:22 peter Exp $ + * $FreeBSD: src/sys/amd64/include/elf.h,v 1.18 2004/08/03 08:21:48 dfr Exp $ + * $FreeBSD: src/sys/arm/include/elf.h,v 1.5.2.1 2006/06/30 21:42:52 cognet Exp $ + * $FreeBSD: src/sys/i386/include/elf.h,v 1.16 2004/08/02 19:12:17 dfr Exp $ + * $FreeBSD: src/sys/powerpc/include/elf.h,v 1.7 2004/11/02 09:47:01 ssouhlal Exp $ + * $FreeBSD: src/sys/sparc64/include/elf.h,v 1.12 2003/09/25 01:10:26 peter Exp $ + * "System V ABI" (http://www.sco.com/developers/gabi/latest/ch4.eheader.html) + * "ELF for the ARM® 64-bit Architecture (AArch64)" (ARM IHI 0056B) + * "RISC-V ELF psABI specification" (https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md) + * llvm/BinaryFormat/ELF.h - ELF constants and structures + * + * Copyright (c) 1996-1998 John D. Polstra. All rights reserved. + * Copyright (c) 2001 David E. O'Brien + * Portions Copyright 2009 The Go Authors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +package elf + +import "strconv" + +/* + * Constants + */ + +// Indexes into the Header.Ident array. +const ( + EI_CLASS = 4 /* Class of machine. */ + EI_DATA = 5 /* Data format. */ + EI_VERSION = 6 /* ELF format version. */ + EI_OSABI = 7 /* Operating system / ABI identification */ + EI_ABIVERSION = 8 /* ABI version */ + EI_PAD = 9 /* Start of padding (per SVR4 ABI). */ + EI_NIDENT = 16 /* Size of e_ident array. */ +) + +// Initial magic number for ELF files. +const ELFMAG = "\177ELF" + +// Version is found in Header.Ident[EI_VERSION] and Header.Version. +type Version byte + +const ( + EV_NONE Version = 0 + EV_CURRENT Version = 1 +) + +var versionStrings = []intName{ + {0, "EV_NONE"}, + {1, "EV_CURRENT"}, +} + +func (i Version) String() string { return stringName(uint32(i), versionStrings, false) } +func (i Version) GoString() string { return stringName(uint32(i), versionStrings, true) } + +// Class is found in Header.Ident[EI_CLASS] and Header.Class. +type Class byte + +const ( + ELFCLASSNONE Class = 0 /* Unknown class. */ + ELFCLASS32 Class = 1 /* 32-bit architecture. */ + ELFCLASS64 Class = 2 /* 64-bit architecture. */ +) + +var classStrings = []intName{ + {0, "ELFCLASSNONE"}, + {1, "ELFCLASS32"}, + {2, "ELFCLASS64"}, +} + +func (i Class) String() string { return stringName(uint32(i), classStrings, false) } +func (i Class) GoString() string { return stringName(uint32(i), classStrings, true) } + +// Data is found in Header.Ident[EI_DATA] and Header.Data. +type Data byte + +const ( + ELFDATANONE Data = 0 /* Unknown data format. */ + ELFDATA2LSB Data = 1 /* 2's complement little-endian. */ + ELFDATA2MSB Data = 2 /* 2's complement big-endian. */ +) + +var dataStrings = []intName{ + {0, "ELFDATANONE"}, + {1, "ELFDATA2LSB"}, + {2, "ELFDATA2MSB"}, +} + +func (i Data) String() string { return stringName(uint32(i), dataStrings, false) } +func (i Data) GoString() string { return stringName(uint32(i), dataStrings, true) } + +// OSABI is found in Header.Ident[EI_OSABI] and Header.OSABI. +type OSABI byte + +const ( + ELFOSABI_NONE OSABI = 0 /* UNIX System V ABI */ + ELFOSABI_HPUX OSABI = 1 /* HP-UX operating system */ + ELFOSABI_NETBSD OSABI = 2 /* NetBSD */ + ELFOSABI_LINUX OSABI = 3 /* Linux */ + ELFOSABI_HURD OSABI = 4 /* Hurd */ + ELFOSABI_86OPEN OSABI = 5 /* 86Open common IA32 ABI */ + ELFOSABI_SOLARIS OSABI = 6 /* Solaris */ + ELFOSABI_AIX OSABI = 7 /* AIX */ + ELFOSABI_IRIX OSABI = 8 /* IRIX */ + ELFOSABI_FREEBSD OSABI = 9 /* FreeBSD */ + ELFOSABI_TRU64 OSABI = 10 /* TRU64 UNIX */ + ELFOSABI_MODESTO OSABI = 11 /* Novell Modesto */ + ELFOSABI_OPENBSD OSABI = 12 /* OpenBSD */ + ELFOSABI_OPENVMS OSABI = 13 /* Open VMS */ + ELFOSABI_NSK OSABI = 14 /* HP Non-Stop Kernel */ + ELFOSABI_AROS OSABI = 15 /* Amiga Research OS */ + ELFOSABI_FENIXOS OSABI = 16 /* The FenixOS highly scalable multi-core OS */ + ELFOSABI_CLOUDABI OSABI = 17 /* Nuxi CloudABI */ + ELFOSABI_ARM OSABI = 97 /* ARM */ + ELFOSABI_STANDALONE OSABI = 255 /* Standalone (embedded) application */ +) + +var osabiStrings = []intName{ + {0, "ELFOSABI_NONE"}, + {1, "ELFOSABI_HPUX"}, + {2, "ELFOSABI_NETBSD"}, + {3, "ELFOSABI_LINUX"}, + {4, "ELFOSABI_HURD"}, + {5, "ELFOSABI_86OPEN"}, + {6, "ELFOSABI_SOLARIS"}, + {7, "ELFOSABI_AIX"}, + {8, "ELFOSABI_IRIX"}, + {9, "ELFOSABI_FREEBSD"}, + {10, "ELFOSABI_TRU64"}, + {11, "ELFOSABI_MODESTO"}, + {12, "ELFOSABI_OPENBSD"}, + {13, "ELFOSABI_OPENVMS"}, + {14, "ELFOSABI_NSK"}, + {15, "ELFOSABI_AROS"}, + {16, "ELFOSABI_FENIXOS"}, + {17, "ELFOSABI_CLOUDABI"}, + {97, "ELFOSABI_ARM"}, + {255, "ELFOSABI_STANDALONE"}, +} + +func (i OSABI) String() string { return stringName(uint32(i), osabiStrings, false) } +func (i OSABI) GoString() string { return stringName(uint32(i), osabiStrings, true) } + +// Type is found in Header.Type. +type Type uint16 + +const ( + ET_NONE Type = 0 /* Unknown type. */ + ET_REL Type = 1 /* Relocatable. */ + ET_EXEC Type = 2 /* Executable. */ + ET_DYN Type = 3 /* Shared object. */ + ET_CORE Type = 4 /* Core file. */ + ET_LOOS Type = 0xfe00 /* First operating system specific. */ + ET_HIOS Type = 0xfeff /* Last operating system-specific. */ + ET_LOPROC Type = 0xff00 /* First processor-specific. */ + ET_HIPROC Type = 0xffff /* Last processor-specific. */ +) + +var typeStrings = []intName{ + {0, "ET_NONE"}, + {1, "ET_REL"}, + {2, "ET_EXEC"}, + {3, "ET_DYN"}, + {4, "ET_CORE"}, + {0xfe00, "ET_LOOS"}, + {0xfeff, "ET_HIOS"}, + {0xff00, "ET_LOPROC"}, + {0xffff, "ET_HIPROC"}, +} + +func (i Type) String() string { return stringName(uint32(i), typeStrings, false) } +func (i Type) GoString() string { return stringName(uint32(i), typeStrings, true) } + +// Machine is found in Header.Machine. +type Machine uint16 + +const ( + EM_NONE Machine = 0 /* Unknown machine. */ + EM_M32 Machine = 1 /* AT&T WE32100. */ + EM_SPARC Machine = 2 /* Sun SPARC. */ + EM_386 Machine = 3 /* Intel i386. */ + EM_68K Machine = 4 /* Motorola 68000. */ + EM_88K Machine = 5 /* Motorola 88000. */ + EM_860 Machine = 7 /* Intel i860. */ + EM_MIPS Machine = 8 /* MIPS R3000 Big-Endian only. */ + EM_S370 Machine = 9 /* IBM System/370. */ + EM_MIPS_RS3_LE Machine = 10 /* MIPS R3000 Little-Endian. */ + EM_PARISC Machine = 15 /* HP PA-RISC. */ + EM_VPP500 Machine = 17 /* Fujitsu VPP500. */ + EM_SPARC32PLUS Machine = 18 /* SPARC v8plus. */ + EM_960 Machine = 19 /* Intel 80960. */ + EM_PPC Machine = 20 /* PowerPC 32-bit. */ + EM_PPC64 Machine = 21 /* PowerPC 64-bit. */ + EM_S390 Machine = 22 /* IBM System/390. */ + EM_V800 Machine = 36 /* NEC V800. */ + EM_FR20 Machine = 37 /* Fujitsu FR20. */ + EM_RH32 Machine = 38 /* TRW RH-32. */ + EM_RCE Machine = 39 /* Motorola RCE. */ + EM_ARM Machine = 40 /* ARM. */ + EM_SH Machine = 42 /* Hitachi SH. */ + EM_SPARCV9 Machine = 43 /* SPARC v9 64-bit. */ + EM_TRICORE Machine = 44 /* Siemens TriCore embedded processor. */ + EM_ARC Machine = 45 /* Argonaut RISC Core. */ + EM_H8_300 Machine = 46 /* Hitachi H8/300. */ + EM_H8_300H Machine = 47 /* Hitachi H8/300H. */ + EM_H8S Machine = 48 /* Hitachi H8S. */ + EM_H8_500 Machine = 49 /* Hitachi H8/500. */ + EM_IA_64 Machine = 50 /* Intel IA-64 Processor. */ + EM_MIPS_X Machine = 51 /* Stanford MIPS-X. */ + EM_COLDFIRE Machine = 52 /* Motorola ColdFire. */ + EM_68HC12 Machine = 53 /* Motorola M68HC12. */ + EM_MMA Machine = 54 /* Fujitsu MMA. */ + EM_PCP Machine = 55 /* Siemens PCP. */ + EM_NCPU Machine = 56 /* Sony nCPU. */ + EM_NDR1 Machine = 57 /* Denso NDR1 microprocessor. */ + EM_STARCORE Machine = 58 /* Motorola Star*Core processor. */ + EM_ME16 Machine = 59 /* Toyota ME16 processor. */ + EM_ST100 Machine = 60 /* STMicroelectronics ST100 processor. */ + EM_TINYJ Machine = 61 /* Advanced Logic Corp. TinyJ processor. */ + EM_X86_64 Machine = 62 /* Advanced Micro Devices x86-64 */ + EM_PDSP Machine = 63 /* Sony DSP Processor */ + EM_PDP10 Machine = 64 /* Digital Equipment Corp. PDP-10 */ + EM_PDP11 Machine = 65 /* Digital Equipment Corp. PDP-11 */ + EM_FX66 Machine = 66 /* Siemens FX66 microcontroller */ + EM_ST9PLUS Machine = 67 /* STMicroelectronics ST9+ 8/16 bit microcontroller */ + EM_ST7 Machine = 68 /* STMicroelectronics ST7 8-bit microcontroller */ + EM_68HC16 Machine = 69 /* Motorola MC68HC16 Microcontroller */ + EM_68HC11 Machine = 70 /* Motorola MC68HC11 Microcontroller */ + EM_68HC08 Machine = 71 /* Motorola MC68HC08 Microcontroller */ + EM_68HC05 Machine = 72 /* Motorola MC68HC05 Microcontroller */ + EM_SVX Machine = 73 /* Silicon Graphics SVx */ + EM_ST19 Machine = 74 /* STMicroelectronics ST19 8-bit microcontroller */ + EM_VAX Machine = 75 /* Digital VAX */ + EM_CRIS Machine = 76 /* Axis Communications 32-bit embedded processor */ + EM_JAVELIN Machine = 77 /* Infineon Technologies 32-bit embedded processor */ + EM_FIREPATH Machine = 78 /* Element 14 64-bit DSP Processor */ + EM_ZSP Machine = 79 /* LSI Logic 16-bit DSP Processor */ + EM_MMIX Machine = 80 /* Donald Knuth's educational 64-bit processor */ + EM_HUANY Machine = 81 /* Harvard University machine-independent object files */ + EM_PRISM Machine = 82 /* SiTera Prism */ + EM_AVR Machine = 83 /* Atmel AVR 8-bit microcontroller */ + EM_FR30 Machine = 84 /* Fujitsu FR30 */ + EM_D10V Machine = 85 /* Mitsubishi D10V */ + EM_D30V Machine = 86 /* Mitsubishi D30V */ + EM_V850 Machine = 87 /* NEC v850 */ + EM_M32R Machine = 88 /* Mitsubishi M32R */ + EM_MN10300 Machine = 89 /* Matsushita MN10300 */ + EM_MN10200 Machine = 90 /* Matsushita MN10200 */ + EM_PJ Machine = 91 /* picoJava */ + EM_OPENRISC Machine = 92 /* OpenRISC 32-bit embedded processor */ + EM_ARC_COMPACT Machine = 93 /* ARC International ARCompact processor (old spelling/synonym: EM_ARC_A5) */ + EM_XTENSA Machine = 94 /* Tensilica Xtensa Architecture */ + EM_VIDEOCORE Machine = 95 /* Alphamosaic VideoCore processor */ + EM_TMM_GPP Machine = 96 /* Thompson Multimedia General Purpose Processor */ + EM_NS32K Machine = 97 /* National Semiconductor 32000 series */ + EM_TPC Machine = 98 /* Tenor Network TPC processor */ + EM_SNP1K Machine = 99 /* Trebia SNP 1000 processor */ + EM_ST200 Machine = 100 /* STMicroelectronics (www.st.com) ST200 microcontroller */ + EM_IP2K Machine = 101 /* Ubicom IP2xxx microcontroller family */ + EM_MAX Machine = 102 /* MAX Processor */ + EM_CR Machine = 103 /* National Semiconductor CompactRISC microprocessor */ + EM_F2MC16 Machine = 104 /* Fujitsu F2MC16 */ + EM_MSP430 Machine = 105 /* Texas Instruments embedded microcontroller msp430 */ + EM_BLACKFIN Machine = 106 /* Analog Devices Blackfin (DSP) processor */ + EM_SE_C33 Machine = 107 /* S1C33 Family of Seiko Epson processors */ + EM_SEP Machine = 108 /* Sharp embedded microprocessor */ + EM_ARCA Machine = 109 /* Arca RISC Microprocessor */ + EM_UNICORE Machine = 110 /* Microprocessor series from PKU-Unity Ltd. and MPRC of Peking University */ + EM_EXCESS Machine = 111 /* eXcess: 16/32/64-bit configurable embedded CPU */ + EM_DXP Machine = 112 /* Icera Semiconductor Inc. Deep Execution Processor */ + EM_ALTERA_NIOS2 Machine = 113 /* Altera Nios II soft-core processor */ + EM_CRX Machine = 114 /* National Semiconductor CompactRISC CRX microprocessor */ + EM_XGATE Machine = 115 /* Motorola XGATE embedded processor */ + EM_C166 Machine = 116 /* Infineon C16x/XC16x processor */ + EM_M16C Machine = 117 /* Renesas M16C series microprocessors */ + EM_DSPIC30F Machine = 118 /* Microchip Technology dsPIC30F Digital Signal Controller */ + EM_CE Machine = 119 /* Freescale Communication Engine RISC core */ + EM_M32C Machine = 120 /* Renesas M32C series microprocessors */ + EM_TSK3000 Machine = 131 /* Altium TSK3000 core */ + EM_RS08 Machine = 132 /* Freescale RS08 embedded processor */ + EM_SHARC Machine = 133 /* Analog Devices SHARC family of 32-bit DSP processors */ + EM_ECOG2 Machine = 134 /* Cyan Technology eCOG2 microprocessor */ + EM_SCORE7 Machine = 135 /* Sunplus S+core7 RISC processor */ + EM_DSP24 Machine = 136 /* New Japan Radio (NJR) 24-bit DSP Processor */ + EM_VIDEOCORE3 Machine = 137 /* Broadcom VideoCore III processor */ + EM_LATTICEMICO32 Machine = 138 /* RISC processor for Lattice FPGA architecture */ + EM_SE_C17 Machine = 139 /* Seiko Epson C17 family */ + EM_TI_C6000 Machine = 140 /* The Texas Instruments TMS320C6000 DSP family */ + EM_TI_C2000 Machine = 141 /* The Texas Instruments TMS320C2000 DSP family */ + EM_TI_C5500 Machine = 142 /* The Texas Instruments TMS320C55x DSP family */ + EM_TI_ARP32 Machine = 143 /* Texas Instruments Application Specific RISC Processor, 32bit fetch */ + EM_TI_PRU Machine = 144 /* Texas Instruments Programmable Realtime Unit */ + EM_MMDSP_PLUS Machine = 160 /* STMicroelectronics 64bit VLIW Data Signal Processor */ + EM_CYPRESS_M8C Machine = 161 /* Cypress M8C microprocessor */ + EM_R32C Machine = 162 /* Renesas R32C series microprocessors */ + EM_TRIMEDIA Machine = 163 /* NXP Semiconductors TriMedia architecture family */ + EM_QDSP6 Machine = 164 /* QUALCOMM DSP6 Processor */ + EM_8051 Machine = 165 /* Intel 8051 and variants */ + EM_STXP7X Machine = 166 /* STMicroelectronics STxP7x family of configurable and extensible RISC processors */ + EM_NDS32 Machine = 167 /* Andes Technology compact code size embedded RISC processor family */ + EM_ECOG1 Machine = 168 /* Cyan Technology eCOG1X family */ + EM_ECOG1X Machine = 168 /* Cyan Technology eCOG1X family */ + EM_MAXQ30 Machine = 169 /* Dallas Semiconductor MAXQ30 Core Micro-controllers */ + EM_XIMO16 Machine = 170 /* New Japan Radio (NJR) 16-bit DSP Processor */ + EM_MANIK Machine = 171 /* M2000 Reconfigurable RISC Microprocessor */ + EM_CRAYNV2 Machine = 172 /* Cray Inc. NV2 vector architecture */ + EM_RX Machine = 173 /* Renesas RX family */ + EM_METAG Machine = 174 /* Imagination Technologies META processor architecture */ + EM_MCST_ELBRUS Machine = 175 /* MCST Elbrus general purpose hardware architecture */ + EM_ECOG16 Machine = 176 /* Cyan Technology eCOG16 family */ + EM_CR16 Machine = 177 /* National Semiconductor CompactRISC CR16 16-bit microprocessor */ + EM_ETPU Machine = 178 /* Freescale Extended Time Processing Unit */ + EM_SLE9X Machine = 179 /* Infineon Technologies SLE9X core */ + EM_L10M Machine = 180 /* Intel L10M */ + EM_K10M Machine = 181 /* Intel K10M */ + EM_AARCH64 Machine = 183 /* ARM 64-bit Architecture (AArch64) */ + EM_AVR32 Machine = 185 /* Atmel Corporation 32-bit microprocessor family */ + EM_STM8 Machine = 186 /* STMicroeletronics STM8 8-bit microcontroller */ + EM_TILE64 Machine = 187 /* Tilera TILE64 multicore architecture family */ + EM_TILEPRO Machine = 188 /* Tilera TILEPro multicore architecture family */ + EM_MICROBLAZE Machine = 189 /* Xilinx MicroBlaze 32-bit RISC soft processor core */ + EM_CUDA Machine = 190 /* NVIDIA CUDA architecture */ + EM_TILEGX Machine = 191 /* Tilera TILE-Gx multicore architecture family */ + EM_CLOUDSHIELD Machine = 192 /* CloudShield architecture family */ + EM_COREA_1ST Machine = 193 /* KIPO-KAIST Core-A 1st generation processor family */ + EM_COREA_2ND Machine = 194 /* KIPO-KAIST Core-A 2nd generation processor family */ + EM_ARC_COMPACT2 Machine = 195 /* Synopsys ARCompact V2 */ + EM_OPEN8 Machine = 196 /* Open8 8-bit RISC soft processor core */ + EM_RL78 Machine = 197 /* Renesas RL78 family */ + EM_VIDEOCORE5 Machine = 198 /* Broadcom VideoCore V processor */ + EM_78KOR Machine = 199 /* Renesas 78KOR family */ + EM_56800EX Machine = 200 /* Freescale 56800EX Digital Signal Controller (DSC) */ + EM_BA1 Machine = 201 /* Beyond BA1 CPU architecture */ + EM_BA2 Machine = 202 /* Beyond BA2 CPU architecture */ + EM_XCORE Machine = 203 /* XMOS xCORE processor family */ + EM_MCHP_PIC Machine = 204 /* Microchip 8-bit PIC(r) family */ + EM_INTEL205 Machine = 205 /* Reserved by Intel */ + EM_INTEL206 Machine = 206 /* Reserved by Intel */ + EM_INTEL207 Machine = 207 /* Reserved by Intel */ + EM_INTEL208 Machine = 208 /* Reserved by Intel */ + EM_INTEL209 Machine = 209 /* Reserved by Intel */ + EM_KM32 Machine = 210 /* KM211 KM32 32-bit processor */ + EM_KMX32 Machine = 211 /* KM211 KMX32 32-bit processor */ + EM_KMX16 Machine = 212 /* KM211 KMX16 16-bit processor */ + EM_KMX8 Machine = 213 /* KM211 KMX8 8-bit processor */ + EM_KVARC Machine = 214 /* KM211 KVARC processor */ + EM_CDP Machine = 215 /* Paneve CDP architecture family */ + EM_COGE Machine = 216 /* Cognitive Smart Memory Processor */ + EM_COOL Machine = 217 /* Bluechip Systems CoolEngine */ + EM_NORC Machine = 218 /* Nanoradio Optimized RISC */ + EM_CSR_KALIMBA Machine = 219 /* CSR Kalimba architecture family */ + EM_Z80 Machine = 220 /* Zilog Z80 */ + EM_VISIUM Machine = 221 /* Controls and Data Services VISIUMcore processor */ + EM_FT32 Machine = 222 /* FTDI Chip FT32 high performance 32-bit RISC architecture */ + EM_MOXIE Machine = 223 /* Moxie processor family */ + EM_AMDGPU Machine = 224 /* AMD GPU architecture */ + EM_RISCV Machine = 243 /* RISC-V */ + EM_LANAI Machine = 244 /* Lanai 32-bit processor */ + EM_BPF Machine = 247 /* Linux BPF – in-kernel virtual machine */ + EM_LOONGARCH Machine = 258 /* LoongArch */ + + /* Non-standard or deprecated. */ + EM_486 Machine = 6 /* Intel i486. */ + EM_MIPS_RS4_BE Machine = 10 /* MIPS R4000 Big-Endian */ + EM_ALPHA_STD Machine = 41 /* Digital Alpha (standard value). */ + EM_ALPHA Machine = 0x9026 /* Alpha (written in the absence of an ABI) */ +) + +var machineStrings = []intName{ + {0, "EM_NONE"}, + {1, "EM_M32"}, + {2, "EM_SPARC"}, + {3, "EM_386"}, + {4, "EM_68K"}, + {5, "EM_88K"}, + {7, "EM_860"}, + {8, "EM_MIPS"}, + {9, "EM_S370"}, + {10, "EM_MIPS_RS3_LE"}, + {15, "EM_PARISC"}, + {17, "EM_VPP500"}, + {18, "EM_SPARC32PLUS"}, + {19, "EM_960"}, + {20, "EM_PPC"}, + {21, "EM_PPC64"}, + {22, "EM_S390"}, + {36, "EM_V800"}, + {37, "EM_FR20"}, + {38, "EM_RH32"}, + {39, "EM_RCE"}, + {40, "EM_ARM"}, + {42, "EM_SH"}, + {43, "EM_SPARCV9"}, + {44, "EM_TRICORE"}, + {45, "EM_ARC"}, + {46, "EM_H8_300"}, + {47, "EM_H8_300H"}, + {48, "EM_H8S"}, + {49, "EM_H8_500"}, + {50, "EM_IA_64"}, + {51, "EM_MIPS_X"}, + {52, "EM_COLDFIRE"}, + {53, "EM_68HC12"}, + {54, "EM_MMA"}, + {55, "EM_PCP"}, + {56, "EM_NCPU"}, + {57, "EM_NDR1"}, + {58, "EM_STARCORE"}, + {59, "EM_ME16"}, + {60, "EM_ST100"}, + {61, "EM_TINYJ"}, + {62, "EM_X86_64"}, + {63, "EM_PDSP"}, + {64, "EM_PDP10"}, + {65, "EM_PDP11"}, + {66, "EM_FX66"}, + {67, "EM_ST9PLUS"}, + {68, "EM_ST7"}, + {69, "EM_68HC16"}, + {70, "EM_68HC11"}, + {71, "EM_68HC08"}, + {72, "EM_68HC05"}, + {73, "EM_SVX"}, + {74, "EM_ST19"}, + {75, "EM_VAX"}, + {76, "EM_CRIS"}, + {77, "EM_JAVELIN"}, + {78, "EM_FIREPATH"}, + {79, "EM_ZSP"}, + {80, "EM_MMIX"}, + {81, "EM_HUANY"}, + {82, "EM_PRISM"}, + {83, "EM_AVR"}, + {84, "EM_FR30"}, + {85, "EM_D10V"}, + {86, "EM_D30V"}, + {87, "EM_V850"}, + {88, "EM_M32R"}, + {89, "EM_MN10300"}, + {90, "EM_MN10200"}, + {91, "EM_PJ"}, + {92, "EM_OPENRISC"}, + {93, "EM_ARC_COMPACT"}, + {94, "EM_XTENSA"}, + {95, "EM_VIDEOCORE"}, + {96, "EM_TMM_GPP"}, + {97, "EM_NS32K"}, + {98, "EM_TPC"}, + {99, "EM_SNP1K"}, + {100, "EM_ST200"}, + {101, "EM_IP2K"}, + {102, "EM_MAX"}, + {103, "EM_CR"}, + {104, "EM_F2MC16"}, + {105, "EM_MSP430"}, + {106, "EM_BLACKFIN"}, + {107, "EM_SE_C33"}, + {108, "EM_SEP"}, + {109, "EM_ARCA"}, + {110, "EM_UNICORE"}, + {111, "EM_EXCESS"}, + {112, "EM_DXP"}, + {113, "EM_ALTERA_NIOS2"}, + {114, "EM_CRX"}, + {115, "EM_XGATE"}, + {116, "EM_C166"}, + {117, "EM_M16C"}, + {118, "EM_DSPIC30F"}, + {119, "EM_CE"}, + {120, "EM_M32C"}, + {131, "EM_TSK3000"}, + {132, "EM_RS08"}, + {133, "EM_SHARC"}, + {134, "EM_ECOG2"}, + {135, "EM_SCORE7"}, + {136, "EM_DSP24"}, + {137, "EM_VIDEOCORE3"}, + {138, "EM_LATTICEMICO32"}, + {139, "EM_SE_C17"}, + {140, "EM_TI_C6000"}, + {141, "EM_TI_C2000"}, + {142, "EM_TI_C5500"}, + {143, "EM_TI_ARP32"}, + {144, "EM_TI_PRU"}, + {160, "EM_MMDSP_PLUS"}, + {161, "EM_CYPRESS_M8C"}, + {162, "EM_R32C"}, + {163, "EM_TRIMEDIA"}, + {164, "EM_QDSP6"}, + {165, "EM_8051"}, + {166, "EM_STXP7X"}, + {167, "EM_NDS32"}, + {168, "EM_ECOG1"}, + {168, "EM_ECOG1X"}, + {169, "EM_MAXQ30"}, + {170, "EM_XIMO16"}, + {171, "EM_MANIK"}, + {172, "EM_CRAYNV2"}, + {173, "EM_RX"}, + {174, "EM_METAG"}, + {175, "EM_MCST_ELBRUS"}, + {176, "EM_ECOG16"}, + {177, "EM_CR16"}, + {178, "EM_ETPU"}, + {179, "EM_SLE9X"}, + {180, "EM_L10M"}, + {181, "EM_K10M"}, + {183, "EM_AARCH64"}, + {185, "EM_AVR32"}, + {186, "EM_STM8"}, + {187, "EM_TILE64"}, + {188, "EM_TILEPRO"}, + {189, "EM_MICROBLAZE"}, + {190, "EM_CUDA"}, + {191, "EM_TILEGX"}, + {192, "EM_CLOUDSHIELD"}, + {193, "EM_COREA_1ST"}, + {194, "EM_COREA_2ND"}, + {195, "EM_ARC_COMPACT2"}, + {196, "EM_OPEN8"}, + {197, "EM_RL78"}, + {198, "EM_VIDEOCORE5"}, + {199, "EM_78KOR"}, + {200, "EM_56800EX"}, + {201, "EM_BA1"}, + {202, "EM_BA2"}, + {203, "EM_XCORE"}, + {204, "EM_MCHP_PIC"}, + {205, "EM_INTEL205"}, + {206, "EM_INTEL206"}, + {207, "EM_INTEL207"}, + {208, "EM_INTEL208"}, + {209, "EM_INTEL209"}, + {210, "EM_KM32"}, + {211, "EM_KMX32"}, + {212, "EM_KMX16"}, + {213, "EM_KMX8"}, + {214, "EM_KVARC"}, + {215, "EM_CDP"}, + {216, "EM_COGE"}, + {217, "EM_COOL"}, + {218, "EM_NORC"}, + {219, "EM_CSR_KALIMBA "}, + {220, "EM_Z80 "}, + {221, "EM_VISIUM "}, + {222, "EM_FT32 "}, + {223, "EM_MOXIE"}, + {224, "EM_AMDGPU"}, + {243, "EM_RISCV"}, + {244, "EM_LANAI"}, + {247, "EM_BPF"}, + {258, "EM_LOONGARCH"}, + + /* Non-standard or deprecated. */ + {6, "EM_486"}, + {10, "EM_MIPS_RS4_BE"}, + {41, "EM_ALPHA_STD"}, + {0x9026, "EM_ALPHA"}, +} + +func (i Machine) String() string { return stringName(uint32(i), machineStrings, false) } +func (i Machine) GoString() string { return stringName(uint32(i), machineStrings, true) } + +// Special section indices. +type SectionIndex int + +const ( + SHN_UNDEF SectionIndex = 0 /* Undefined, missing, irrelevant. */ + SHN_LORESERVE SectionIndex = 0xff00 /* First of reserved range. */ + SHN_LOPROC SectionIndex = 0xff00 /* First processor-specific. */ + SHN_HIPROC SectionIndex = 0xff1f /* Last processor-specific. */ + SHN_LOOS SectionIndex = 0xff20 /* First operating system-specific. */ + SHN_HIOS SectionIndex = 0xff3f /* Last operating system-specific. */ + SHN_ABS SectionIndex = 0xfff1 /* Absolute values. */ + SHN_COMMON SectionIndex = 0xfff2 /* Common data. */ + SHN_XINDEX SectionIndex = 0xffff /* Escape; index stored elsewhere. */ + SHN_HIRESERVE SectionIndex = 0xffff /* Last of reserved range. */ +) + +var shnStrings = []intName{ + {0, "SHN_UNDEF"}, + {0xff00, "SHN_LOPROC"}, + {0xff20, "SHN_LOOS"}, + {0xfff1, "SHN_ABS"}, + {0xfff2, "SHN_COMMON"}, + {0xffff, "SHN_XINDEX"}, +} + +func (i SectionIndex) String() string { return stringName(uint32(i), shnStrings, false) } +func (i SectionIndex) GoString() string { return stringName(uint32(i), shnStrings, true) } + +// Section type. +type SectionType uint32 + +const ( + SHT_NULL SectionType = 0 /* inactive */ + SHT_PROGBITS SectionType = 1 /* program defined information */ + SHT_SYMTAB SectionType = 2 /* symbol table section */ + SHT_STRTAB SectionType = 3 /* string table section */ + SHT_RELA SectionType = 4 /* relocation section with addends */ + SHT_HASH SectionType = 5 /* symbol hash table section */ + SHT_DYNAMIC SectionType = 6 /* dynamic section */ + SHT_NOTE SectionType = 7 /* note section */ + SHT_NOBITS SectionType = 8 /* no space section */ + SHT_REL SectionType = 9 /* relocation section - no addends */ + SHT_SHLIB SectionType = 10 /* reserved - purpose unknown */ + SHT_DYNSYM SectionType = 11 /* dynamic symbol table section */ + SHT_INIT_ARRAY SectionType = 14 /* Initialization function pointers. */ + SHT_FINI_ARRAY SectionType = 15 /* Termination function pointers. */ + SHT_PREINIT_ARRAY SectionType = 16 /* Pre-initialization function ptrs. */ + SHT_GROUP SectionType = 17 /* Section group. */ + SHT_SYMTAB_SHNDX SectionType = 18 /* Section indexes (see SHN_XINDEX). */ + SHT_LOOS SectionType = 0x60000000 /* First of OS specific semantics */ + SHT_GNU_ATTRIBUTES SectionType = 0x6ffffff5 /* GNU object attributes */ + SHT_GNU_HASH SectionType = 0x6ffffff6 /* GNU hash table */ + SHT_GNU_LIBLIST SectionType = 0x6ffffff7 /* GNU prelink library list */ + SHT_GNU_VERDEF SectionType = 0x6ffffffd /* GNU version definition section */ + SHT_GNU_VERNEED SectionType = 0x6ffffffe /* GNU version needs section */ + SHT_GNU_VERSYM SectionType = 0x6fffffff /* GNU version symbol table */ + SHT_HIOS SectionType = 0x6fffffff /* Last of OS specific semantics */ + SHT_LOPROC SectionType = 0x70000000 /* reserved range for processor */ + SHT_MIPS_ABIFLAGS SectionType = 0x7000002a /* .MIPS.abiflags */ + SHT_HIPROC SectionType = 0x7fffffff /* specific section header types */ + SHT_LOUSER SectionType = 0x80000000 /* reserved range for application */ + SHT_HIUSER SectionType = 0xffffffff /* specific indexes */ +) + +var shtStrings = []intName{ + {0, "SHT_NULL"}, + {1, "SHT_PROGBITS"}, + {2, "SHT_SYMTAB"}, + {3, "SHT_STRTAB"}, + {4, "SHT_RELA"}, + {5, "SHT_HASH"}, + {6, "SHT_DYNAMIC"}, + {7, "SHT_NOTE"}, + {8, "SHT_NOBITS"}, + {9, "SHT_REL"}, + {10, "SHT_SHLIB"}, + {11, "SHT_DYNSYM"}, + {14, "SHT_INIT_ARRAY"}, + {15, "SHT_FINI_ARRAY"}, + {16, "SHT_PREINIT_ARRAY"}, + {17, "SHT_GROUP"}, + {18, "SHT_SYMTAB_SHNDX"}, + {0x60000000, "SHT_LOOS"}, + {0x6ffffff5, "SHT_GNU_ATTRIBUTES"}, + {0x6ffffff6, "SHT_GNU_HASH"}, + {0x6ffffff7, "SHT_GNU_LIBLIST"}, + {0x6ffffffd, "SHT_GNU_VERDEF"}, + {0x6ffffffe, "SHT_GNU_VERNEED"}, + {0x6fffffff, "SHT_GNU_VERSYM"}, + {0x70000000, "SHT_LOPROC"}, + {0x7000002a, "SHT_MIPS_ABIFLAGS"}, + {0x7fffffff, "SHT_HIPROC"}, + {0x80000000, "SHT_LOUSER"}, + {0xffffffff, "SHT_HIUSER"}, +} + +func (i SectionType) String() string { return stringName(uint32(i), shtStrings, false) } +func (i SectionType) GoString() string { return stringName(uint32(i), shtStrings, true) } + +// Section flags. +type SectionFlag uint32 + +const ( + SHF_WRITE SectionFlag = 0x1 /* Section contains writable data. */ + SHF_ALLOC SectionFlag = 0x2 /* Section occupies memory. */ + SHF_EXECINSTR SectionFlag = 0x4 /* Section contains instructions. */ + SHF_MERGE SectionFlag = 0x10 /* Section may be merged. */ + SHF_STRINGS SectionFlag = 0x20 /* Section contains strings. */ + SHF_INFO_LINK SectionFlag = 0x40 /* sh_info holds section index. */ + SHF_LINK_ORDER SectionFlag = 0x80 /* Special ordering requirements. */ + SHF_OS_NONCONFORMING SectionFlag = 0x100 /* OS-specific processing required. */ + SHF_GROUP SectionFlag = 0x200 /* Member of section group. */ + SHF_TLS SectionFlag = 0x400 /* Section contains TLS data. */ + SHF_COMPRESSED SectionFlag = 0x800 /* Section is compressed. */ + SHF_MASKOS SectionFlag = 0x0ff00000 /* OS-specific semantics. */ + SHF_MASKPROC SectionFlag = 0xf0000000 /* Processor-specific semantics. */ +) + +var shfStrings = []intName{ + {0x1, "SHF_WRITE"}, + {0x2, "SHF_ALLOC"}, + {0x4, "SHF_EXECINSTR"}, + {0x10, "SHF_MERGE"}, + {0x20, "SHF_STRINGS"}, + {0x40, "SHF_INFO_LINK"}, + {0x80, "SHF_LINK_ORDER"}, + {0x100, "SHF_OS_NONCONFORMING"}, + {0x200, "SHF_GROUP"}, + {0x400, "SHF_TLS"}, + {0x800, "SHF_COMPRESSED"}, +} + +func (i SectionFlag) String() string { return flagName(uint32(i), shfStrings, false) } +func (i SectionFlag) GoString() string { return flagName(uint32(i), shfStrings, true) } + +// Section compression type. +type CompressionType int + +const ( + COMPRESS_ZLIB CompressionType = 1 /* ZLIB compression. */ + COMPRESS_LOOS CompressionType = 0x60000000 /* First OS-specific. */ + COMPRESS_HIOS CompressionType = 0x6fffffff /* Last OS-specific. */ + COMPRESS_LOPROC CompressionType = 0x70000000 /* First processor-specific type. */ + COMPRESS_HIPROC CompressionType = 0x7fffffff /* Last processor-specific type. */ +) + +var compressionStrings = []intName{ + {1, "COMPRESS_ZLIB"}, + {0x60000000, "COMPRESS_LOOS"}, + {0x6fffffff, "COMPRESS_HIOS"}, + {0x70000000, "COMPRESS_LOPROC"}, + {0x7fffffff, "COMPRESS_HIPROC"}, +} + +func (i CompressionType) String() string { return stringName(uint32(i), compressionStrings, false) } +func (i CompressionType) GoString() string { return stringName(uint32(i), compressionStrings, true) } + +// Prog.Type +type ProgType int + +const ( + PT_NULL ProgType = 0 /* Unused entry. */ + PT_LOAD ProgType = 1 /* Loadable segment. */ + PT_DYNAMIC ProgType = 2 /* Dynamic linking information segment. */ + PT_INTERP ProgType = 3 /* Pathname of interpreter. */ + PT_NOTE ProgType = 4 /* Auxiliary information. */ + PT_SHLIB ProgType = 5 /* Reserved (not used). */ + PT_PHDR ProgType = 6 /* Location of program header itself. */ + PT_TLS ProgType = 7 /* Thread local storage segment */ + + PT_LOOS ProgType = 0x60000000 /* First OS-specific. */ + + PT_GNU_EH_FRAME ProgType = 0x6474e550 /* Frame unwind information */ + PT_GNU_STACK ProgType = 0x6474e551 /* Stack flags */ + PT_GNU_RELRO ProgType = 0x6474e552 /* Read only after relocs */ + PT_GNU_PROPERTY ProgType = 0x6474e553 /* GNU property */ + PT_GNU_MBIND_LO ProgType = 0x6474e555 /* Mbind segments start */ + PT_GNU_MBIND_HI ProgType = 0x6474f554 /* Mbind segments finish */ + + PT_PAX_FLAGS ProgType = 0x65041580 /* PAX flags */ + + PT_OPENBSD_RANDOMIZE ProgType = 0x65a3dbe6 /* Random data */ + PT_OPENBSD_WXNEEDED ProgType = 0x65a3dbe7 /* W^X violations */ + PT_OPENBSD_BOOTDATA ProgType = 0x65a41be6 /* Boot arguments */ + + PT_SUNW_EH_FRAME ProgType = 0x6474e550 /* Frame unwind information */ + PT_SUNWSTACK ProgType = 0x6ffffffb /* Stack segment */ + + PT_HIOS ProgType = 0x6fffffff /* Last OS-specific. */ + + PT_LOPROC ProgType = 0x70000000 /* First processor-specific type. */ + + PT_ARM_ARCHEXT ProgType = 0x70000000 /* Architecture compatibility */ + PT_ARM_EXIDX ProgType = 0x70000001 /* Exception unwind tables */ + + PT_AARCH64_ARCHEXT ProgType = 0x70000000 /* Architecture compatibility */ + PT_AARCH64_UNWIND ProgType = 0x70000001 /* Exception unwind tables */ + + PT_MIPS_REGINFO ProgType = 0x70000000 /* Register usage */ + PT_MIPS_RTPROC ProgType = 0x70000001 /* Runtime procedures */ + PT_MIPS_OPTIONS ProgType = 0x70000002 /* Options */ + PT_MIPS_ABIFLAGS ProgType = 0x70000003 /* ABI flags */ + + PT_S390_PGSTE ProgType = 0x70000000 /* 4k page table size */ + + PT_HIPROC ProgType = 0x7fffffff /* Last processor-specific type. */ +) + +var ptStrings = []intName{ + {0, "PT_NULL"}, + {1, "PT_LOAD"}, + {2, "PT_DYNAMIC"}, + {3, "PT_INTERP"}, + {4, "PT_NOTE"}, + {5, "PT_SHLIB"}, + {6, "PT_PHDR"}, + {7, "PT_TLS"}, + {0x60000000, "PT_LOOS"}, + {0x6474e550, "PT_GNU_EH_FRAME"}, + {0x6474e551, "PT_GNU_STACK"}, + {0x6474e552, "PT_GNU_RELRO"}, + {0x6474e553, "PT_GNU_PROPERTY"}, + {0x65041580, "PT_PAX_FLAGS"}, + {0x65a3dbe6, "PT_OPENBSD_RANDOMIZE"}, + {0x65a3dbe7, "PT_OPENBSD_WXNEEDED"}, + {0x65a41be6, "PT_OPENBSD_BOOTDATA"}, + {0x6ffffffb, "PT_SUNWSTACK"}, + {0x6fffffff, "PT_HIOS"}, + {0x70000000, "PT_LOPROC"}, + // We don't list the processor-dependent ProgTypes, + // as the values overlap. + {0x7fffffff, "PT_HIPROC"}, +} + +func (i ProgType) String() string { return stringName(uint32(i), ptStrings, false) } +func (i ProgType) GoString() string { return stringName(uint32(i), ptStrings, true) } + +// Prog.Flag +type ProgFlag uint32 + +const ( + PF_X ProgFlag = 0x1 /* Executable. */ + PF_W ProgFlag = 0x2 /* Writable. */ + PF_R ProgFlag = 0x4 /* Readable. */ + PF_MASKOS ProgFlag = 0x0ff00000 /* Operating system-specific. */ + PF_MASKPROC ProgFlag = 0xf0000000 /* Processor-specific. */ +) + +var pfStrings = []intName{ + {0x1, "PF_X"}, + {0x2, "PF_W"}, + {0x4, "PF_R"}, +} + +func (i ProgFlag) String() string { return flagName(uint32(i), pfStrings, false) } +func (i ProgFlag) GoString() string { return flagName(uint32(i), pfStrings, true) } + +// Dyn.Tag +type DynTag int + +const ( + DT_NULL DynTag = 0 /* Terminating entry. */ + DT_NEEDED DynTag = 1 /* String table offset of a needed shared library. */ + DT_PLTRELSZ DynTag = 2 /* Total size in bytes of PLT relocations. */ + DT_PLTGOT DynTag = 3 /* Processor-dependent address. */ + DT_HASH DynTag = 4 /* Address of symbol hash table. */ + DT_STRTAB DynTag = 5 /* Address of string table. */ + DT_SYMTAB DynTag = 6 /* Address of symbol table. */ + DT_RELA DynTag = 7 /* Address of ElfNN_Rela relocations. */ + DT_RELASZ DynTag = 8 /* Total size of ElfNN_Rela relocations. */ + DT_RELAENT DynTag = 9 /* Size of each ElfNN_Rela relocation entry. */ + DT_STRSZ DynTag = 10 /* Size of string table. */ + DT_SYMENT DynTag = 11 /* Size of each symbol table entry. */ + DT_INIT DynTag = 12 /* Address of initialization function. */ + DT_FINI DynTag = 13 /* Address of finalization function. */ + DT_SONAME DynTag = 14 /* String table offset of shared object name. */ + DT_RPATH DynTag = 15 /* String table offset of library path. [sup] */ + DT_SYMBOLIC DynTag = 16 /* Indicates "symbolic" linking. [sup] */ + DT_REL DynTag = 17 /* Address of ElfNN_Rel relocations. */ + DT_RELSZ DynTag = 18 /* Total size of ElfNN_Rel relocations. */ + DT_RELENT DynTag = 19 /* Size of each ElfNN_Rel relocation. */ + DT_PLTREL DynTag = 20 /* Type of relocation used for PLT. */ + DT_DEBUG DynTag = 21 /* Reserved (not used). */ + DT_TEXTREL DynTag = 22 /* Indicates there may be relocations in non-writable segments. [sup] */ + DT_JMPREL DynTag = 23 /* Address of PLT relocations. */ + DT_BIND_NOW DynTag = 24 /* [sup] */ + DT_INIT_ARRAY DynTag = 25 /* Address of the array of pointers to initialization functions */ + DT_FINI_ARRAY DynTag = 26 /* Address of the array of pointers to termination functions */ + DT_INIT_ARRAYSZ DynTag = 27 /* Size in bytes of the array of initialization functions. */ + DT_FINI_ARRAYSZ DynTag = 28 /* Size in bytes of the array of termination functions. */ + DT_RUNPATH DynTag = 29 /* String table offset of a null-terminated library search path string. */ + DT_FLAGS DynTag = 30 /* Object specific flag values. */ + DT_ENCODING DynTag = 32 /* Values greater than or equal to DT_ENCODING + and less than DT_LOOS follow the rules for + the interpretation of the d_un union + as follows: even == 'd_ptr', even == 'd_val' + or none */ + DT_PREINIT_ARRAY DynTag = 32 /* Address of the array of pointers to pre-initialization functions. */ + DT_PREINIT_ARRAYSZ DynTag = 33 /* Size in bytes of the array of pre-initialization functions. */ + DT_SYMTAB_SHNDX DynTag = 34 /* Address of SHT_SYMTAB_SHNDX section. */ + + DT_LOOS DynTag = 0x6000000d /* First OS-specific */ + DT_HIOS DynTag = 0x6ffff000 /* Last OS-specific */ + + DT_VALRNGLO DynTag = 0x6ffffd00 + DT_GNU_PRELINKED DynTag = 0x6ffffdf5 + DT_GNU_CONFLICTSZ DynTag = 0x6ffffdf6 + DT_GNU_LIBLISTSZ DynTag = 0x6ffffdf7 + DT_CHECKSUM DynTag = 0x6ffffdf8 + DT_PLTPADSZ DynTag = 0x6ffffdf9 + DT_MOVEENT DynTag = 0x6ffffdfa + DT_MOVESZ DynTag = 0x6ffffdfb + DT_FEATURE DynTag = 0x6ffffdfc + DT_POSFLAG_1 DynTag = 0x6ffffdfd + DT_SYMINSZ DynTag = 0x6ffffdfe + DT_SYMINENT DynTag = 0x6ffffdff + DT_VALRNGHI DynTag = 0x6ffffdff + + DT_ADDRRNGLO DynTag = 0x6ffffe00 + DT_GNU_HASH DynTag = 0x6ffffef5 + DT_TLSDESC_PLT DynTag = 0x6ffffef6 + DT_TLSDESC_GOT DynTag = 0x6ffffef7 + DT_GNU_CONFLICT DynTag = 0x6ffffef8 + DT_GNU_LIBLIST DynTag = 0x6ffffef9 + DT_CONFIG DynTag = 0x6ffffefa + DT_DEPAUDIT DynTag = 0x6ffffefb + DT_AUDIT DynTag = 0x6ffffefc + DT_PLTPAD DynTag = 0x6ffffefd + DT_MOVETAB DynTag = 0x6ffffefe + DT_SYMINFO DynTag = 0x6ffffeff + DT_ADDRRNGHI DynTag = 0x6ffffeff + + DT_VERSYM DynTag = 0x6ffffff0 + DT_RELACOUNT DynTag = 0x6ffffff9 + DT_RELCOUNT DynTag = 0x6ffffffa + DT_FLAGS_1 DynTag = 0x6ffffffb + DT_VERDEF DynTag = 0x6ffffffc + DT_VERDEFNUM DynTag = 0x6ffffffd + DT_VERNEED DynTag = 0x6ffffffe + DT_VERNEEDNUM DynTag = 0x6fffffff + + DT_LOPROC DynTag = 0x70000000 /* First processor-specific type. */ + + DT_MIPS_RLD_VERSION DynTag = 0x70000001 + DT_MIPS_TIME_STAMP DynTag = 0x70000002 + DT_MIPS_ICHECKSUM DynTag = 0x70000003 + DT_MIPS_IVERSION DynTag = 0x70000004 + DT_MIPS_FLAGS DynTag = 0x70000005 + DT_MIPS_BASE_ADDRESS DynTag = 0x70000006 + DT_MIPS_MSYM DynTag = 0x70000007 + DT_MIPS_CONFLICT DynTag = 0x70000008 + DT_MIPS_LIBLIST DynTag = 0x70000009 + DT_MIPS_LOCAL_GOTNO DynTag = 0x7000000a + DT_MIPS_CONFLICTNO DynTag = 0x7000000b + DT_MIPS_LIBLISTNO DynTag = 0x70000010 + DT_MIPS_SYMTABNO DynTag = 0x70000011 + DT_MIPS_UNREFEXTNO DynTag = 0x70000012 + DT_MIPS_GOTSYM DynTag = 0x70000013 + DT_MIPS_HIPAGENO DynTag = 0x70000014 + DT_MIPS_RLD_MAP DynTag = 0x70000016 + DT_MIPS_DELTA_CLASS DynTag = 0x70000017 + DT_MIPS_DELTA_CLASS_NO DynTag = 0x70000018 + DT_MIPS_DELTA_INSTANCE DynTag = 0x70000019 + DT_MIPS_DELTA_INSTANCE_NO DynTag = 0x7000001a + DT_MIPS_DELTA_RELOC DynTag = 0x7000001b + DT_MIPS_DELTA_RELOC_NO DynTag = 0x7000001c + DT_MIPS_DELTA_SYM DynTag = 0x7000001d + DT_MIPS_DELTA_SYM_NO DynTag = 0x7000001e + DT_MIPS_DELTA_CLASSSYM DynTag = 0x70000020 + DT_MIPS_DELTA_CLASSSYM_NO DynTag = 0x70000021 + DT_MIPS_CXX_FLAGS DynTag = 0x70000022 + DT_MIPS_PIXIE_INIT DynTag = 0x70000023 + DT_MIPS_SYMBOL_LIB DynTag = 0x70000024 + DT_MIPS_LOCALPAGE_GOTIDX DynTag = 0x70000025 + DT_MIPS_LOCAL_GOTIDX DynTag = 0x70000026 + DT_MIPS_HIDDEN_GOTIDX DynTag = 0x70000027 + DT_MIPS_PROTECTED_GOTIDX DynTag = 0x70000028 + DT_MIPS_OPTIONS DynTag = 0x70000029 + DT_MIPS_INTERFACE DynTag = 0x7000002a + DT_MIPS_DYNSTR_ALIGN DynTag = 0x7000002b + DT_MIPS_INTERFACE_SIZE DynTag = 0x7000002c + DT_MIPS_RLD_TEXT_RESOLVE_ADDR DynTag = 0x7000002d + DT_MIPS_PERF_SUFFIX DynTag = 0x7000002e + DT_MIPS_COMPACT_SIZE DynTag = 0x7000002f + DT_MIPS_GP_VALUE DynTag = 0x70000030 + DT_MIPS_AUX_DYNAMIC DynTag = 0x70000031 + DT_MIPS_PLTGOT DynTag = 0x70000032 + DT_MIPS_RWPLT DynTag = 0x70000034 + DT_MIPS_RLD_MAP_REL DynTag = 0x70000035 + + DT_PPC_GOT DynTag = 0x70000000 + DT_PPC_OPT DynTag = 0x70000001 + + DT_PPC64_GLINK DynTag = 0x70000000 + DT_PPC64_OPD DynTag = 0x70000001 + DT_PPC64_OPDSZ DynTag = 0x70000002 + DT_PPC64_OPT DynTag = 0x70000003 + + DT_SPARC_REGISTER DynTag = 0x70000001 + + DT_AUXILIARY DynTag = 0x7ffffffd + DT_USED DynTag = 0x7ffffffe + DT_FILTER DynTag = 0x7fffffff + + DT_HIPROC DynTag = 0x7fffffff /* Last processor-specific type. */ +) + +var dtStrings = []intName{ + {0, "DT_NULL"}, + {1, "DT_NEEDED"}, + {2, "DT_PLTRELSZ"}, + {3, "DT_PLTGOT"}, + {4, "DT_HASH"}, + {5, "DT_STRTAB"}, + {6, "DT_SYMTAB"}, + {7, "DT_RELA"}, + {8, "DT_RELASZ"}, + {9, "DT_RELAENT"}, + {10, "DT_STRSZ"}, + {11, "DT_SYMENT"}, + {12, "DT_INIT"}, + {13, "DT_FINI"}, + {14, "DT_SONAME"}, + {15, "DT_RPATH"}, + {16, "DT_SYMBOLIC"}, + {17, "DT_REL"}, + {18, "DT_RELSZ"}, + {19, "DT_RELENT"}, + {20, "DT_PLTREL"}, + {21, "DT_DEBUG"}, + {22, "DT_TEXTREL"}, + {23, "DT_JMPREL"}, + {24, "DT_BIND_NOW"}, + {25, "DT_INIT_ARRAY"}, + {26, "DT_FINI_ARRAY"}, + {27, "DT_INIT_ARRAYSZ"}, + {28, "DT_FINI_ARRAYSZ"}, + {29, "DT_RUNPATH"}, + {30, "DT_FLAGS"}, + {32, "DT_ENCODING"}, + {32, "DT_PREINIT_ARRAY"}, + {33, "DT_PREINIT_ARRAYSZ"}, + {34, "DT_SYMTAB_SHNDX"}, + {0x6000000d, "DT_LOOS"}, + {0x6ffff000, "DT_HIOS"}, + {0x6ffffd00, "DT_VALRNGLO"}, + {0x6ffffdf5, "DT_GNU_PRELINKED"}, + {0x6ffffdf6, "DT_GNU_CONFLICTSZ"}, + {0x6ffffdf7, "DT_GNU_LIBLISTSZ"}, + {0x6ffffdf8, "DT_CHECKSUM"}, + {0x6ffffdf9, "DT_PLTPADSZ"}, + {0x6ffffdfa, "DT_MOVEENT"}, + {0x6ffffdfb, "DT_MOVESZ"}, + {0x6ffffdfc, "DT_FEATURE"}, + {0x6ffffdfd, "DT_POSFLAG_1"}, + {0x6ffffdfe, "DT_SYMINSZ"}, + {0x6ffffdff, "DT_SYMINENT"}, + {0x6ffffdff, "DT_VALRNGHI"}, + {0x6ffffe00, "DT_ADDRRNGLO"}, + {0x6ffffef5, "DT_GNU_HASH"}, + {0x6ffffef6, "DT_TLSDESC_PLT"}, + {0x6ffffef7, "DT_TLSDESC_GOT"}, + {0x6ffffef8, "DT_GNU_CONFLICT"}, + {0x6ffffef9, "DT_GNU_LIBLIST"}, + {0x6ffffefa, "DT_CONFIG"}, + {0x6ffffefb, "DT_DEPAUDIT"}, + {0x6ffffefc, "DT_AUDIT"}, + {0x6ffffefd, "DT_PLTPAD"}, + {0x6ffffefe, "DT_MOVETAB"}, + {0x6ffffeff, "DT_SYMINFO"}, + {0x6ffffeff, "DT_ADDRRNGHI"}, + {0x6ffffff0, "DT_VERSYM"}, + {0x6ffffff9, "DT_RELACOUNT"}, + {0x6ffffffa, "DT_RELCOUNT"}, + {0x6ffffffb, "DT_FLAGS_1"}, + {0x6ffffffc, "DT_VERDEF"}, + {0x6ffffffd, "DT_VERDEFNUM"}, + {0x6ffffffe, "DT_VERNEED"}, + {0x6fffffff, "DT_VERNEEDNUM"}, + {0x70000000, "DT_LOPROC"}, + // We don't list the processor-dependent DynTags, + // as the values overlap. + {0x7ffffffd, "DT_AUXILIARY"}, + {0x7ffffffe, "DT_USED"}, + {0x7fffffff, "DT_FILTER"}, +} + +func (i DynTag) String() string { return stringName(uint32(i), dtStrings, false) } +func (i DynTag) GoString() string { return stringName(uint32(i), dtStrings, true) } + +// DT_FLAGS values. +type DynFlag int + +const ( + DF_ORIGIN DynFlag = 0x0001 /* Indicates that the object being loaded may + make reference to the + $ORIGIN substitution string */ + DF_SYMBOLIC DynFlag = 0x0002 /* Indicates "symbolic" linking. */ + DF_TEXTREL DynFlag = 0x0004 /* Indicates there may be relocations in non-writable segments. */ + DF_BIND_NOW DynFlag = 0x0008 /* Indicates that the dynamic linker should + process all relocations for the object + containing this entry before transferring + control to the program. */ + DF_STATIC_TLS DynFlag = 0x0010 /* Indicates that the shared object or + executable contains code using a static + thread-local storage scheme. */ +) + +var dflagStrings = []intName{ + {0x0001, "DF_ORIGIN"}, + {0x0002, "DF_SYMBOLIC"}, + {0x0004, "DF_TEXTREL"}, + {0x0008, "DF_BIND_NOW"}, + {0x0010, "DF_STATIC_TLS"}, +} + +func (i DynFlag) String() string { return flagName(uint32(i), dflagStrings, false) } +func (i DynFlag) GoString() string { return flagName(uint32(i), dflagStrings, true) } + +// NType values; used in core files. +type NType int + +const ( + NT_PRSTATUS NType = 1 /* Process status. */ + NT_FPREGSET NType = 2 /* Floating point registers. */ + NT_PRPSINFO NType = 3 /* Process state info. */ +) + +var ntypeStrings = []intName{ + {1, "NT_PRSTATUS"}, + {2, "NT_FPREGSET"}, + {3, "NT_PRPSINFO"}, +} + +func (i NType) String() string { return stringName(uint32(i), ntypeStrings, false) } +func (i NType) GoString() string { return stringName(uint32(i), ntypeStrings, true) } + +/* Symbol Binding - ELFNN_ST_BIND - st_info */ +type SymBind int + +const ( + STB_LOCAL SymBind = 0 /* Local symbol */ + STB_GLOBAL SymBind = 1 /* Global symbol */ + STB_WEAK SymBind = 2 /* like global - lower precedence */ + STB_LOOS SymBind = 10 /* Reserved range for operating system */ + STB_HIOS SymBind = 12 /* specific semantics. */ + STB_LOPROC SymBind = 13 /* reserved range for processor */ + STB_HIPROC SymBind = 15 /* specific semantics. */ +) + +var stbStrings = []intName{ + {0, "STB_LOCAL"}, + {1, "STB_GLOBAL"}, + {2, "STB_WEAK"}, + {10, "STB_LOOS"}, + {12, "STB_HIOS"}, + {13, "STB_LOPROC"}, + {15, "STB_HIPROC"}, +} + +func (i SymBind) String() string { return stringName(uint32(i), stbStrings, false) } +func (i SymBind) GoString() string { return stringName(uint32(i), stbStrings, true) } + +/* Symbol type - ELFNN_ST_TYPE - st_info */ +type SymType int + +const ( + STT_NOTYPE SymType = 0 /* Unspecified type. */ + STT_OBJECT SymType = 1 /* Data object. */ + STT_FUNC SymType = 2 /* Function. */ + STT_SECTION SymType = 3 /* Section. */ + STT_FILE SymType = 4 /* Source file. */ + STT_COMMON SymType = 5 /* Uninitialized common block. */ + STT_TLS SymType = 6 /* TLS object. */ + STT_LOOS SymType = 10 /* Reserved range for operating system */ + STT_HIOS SymType = 12 /* specific semantics. */ + STT_LOPROC SymType = 13 /* reserved range for processor */ + STT_HIPROC SymType = 15 /* specific semantics. */ +) + +var sttStrings = []intName{ + {0, "STT_NOTYPE"}, + {1, "STT_OBJECT"}, + {2, "STT_FUNC"}, + {3, "STT_SECTION"}, + {4, "STT_FILE"}, + {5, "STT_COMMON"}, + {6, "STT_TLS"}, + {10, "STT_LOOS"}, + {12, "STT_HIOS"}, + {13, "STT_LOPROC"}, + {15, "STT_HIPROC"}, +} + +func (i SymType) String() string { return stringName(uint32(i), sttStrings, false) } +func (i SymType) GoString() string { return stringName(uint32(i), sttStrings, true) } + +/* Symbol visibility - ELFNN_ST_VISIBILITY - st_other */ +type SymVis int + +const ( + STV_DEFAULT SymVis = 0x0 /* Default visibility (see binding). */ + STV_INTERNAL SymVis = 0x1 /* Special meaning in relocatable objects. */ + STV_HIDDEN SymVis = 0x2 /* Not visible. */ + STV_PROTECTED SymVis = 0x3 /* Visible but not preemptible. */ +) + +var stvStrings = []intName{ + {0x0, "STV_DEFAULT"}, + {0x1, "STV_INTERNAL"}, + {0x2, "STV_HIDDEN"}, + {0x3, "STV_PROTECTED"}, +} + +func (i SymVis) String() string { return stringName(uint32(i), stvStrings, false) } +func (i SymVis) GoString() string { return stringName(uint32(i), stvStrings, true) } + +/* + * Relocation types. + */ + +// Relocation types for x86-64. +type R_X86_64 int + +const ( + R_X86_64_NONE R_X86_64 = 0 /* No relocation. */ + R_X86_64_64 R_X86_64 = 1 /* Add 64 bit symbol value. */ + R_X86_64_PC32 R_X86_64 = 2 /* PC-relative 32 bit signed sym value. */ + R_X86_64_GOT32 R_X86_64 = 3 /* PC-relative 32 bit GOT offset. */ + R_X86_64_PLT32 R_X86_64 = 4 /* PC-relative 32 bit PLT offset. */ + R_X86_64_COPY R_X86_64 = 5 /* Copy data from shared object. */ + R_X86_64_GLOB_DAT R_X86_64 = 6 /* Set GOT entry to data address. */ + R_X86_64_JMP_SLOT R_X86_64 = 7 /* Set GOT entry to code address. */ + R_X86_64_RELATIVE R_X86_64 = 8 /* Add load address of shared object. */ + R_X86_64_GOTPCREL R_X86_64 = 9 /* Add 32 bit signed pcrel offset to GOT. */ + R_X86_64_32 R_X86_64 = 10 /* Add 32 bit zero extended symbol value */ + R_X86_64_32S R_X86_64 = 11 /* Add 32 bit sign extended symbol value */ + R_X86_64_16 R_X86_64 = 12 /* Add 16 bit zero extended symbol value */ + R_X86_64_PC16 R_X86_64 = 13 /* Add 16 bit signed extended pc relative symbol value */ + R_X86_64_8 R_X86_64 = 14 /* Add 8 bit zero extended symbol value */ + R_X86_64_PC8 R_X86_64 = 15 /* Add 8 bit signed extended pc relative symbol value */ + R_X86_64_DTPMOD64 R_X86_64 = 16 /* ID of module containing symbol */ + R_X86_64_DTPOFF64 R_X86_64 = 17 /* Offset in TLS block */ + R_X86_64_TPOFF64 R_X86_64 = 18 /* Offset in static TLS block */ + R_X86_64_TLSGD R_X86_64 = 19 /* PC relative offset to GD GOT entry */ + R_X86_64_TLSLD R_X86_64 = 20 /* PC relative offset to LD GOT entry */ + R_X86_64_DTPOFF32 R_X86_64 = 21 /* Offset in TLS block */ + R_X86_64_GOTTPOFF R_X86_64 = 22 /* PC relative offset to IE GOT entry */ + R_X86_64_TPOFF32 R_X86_64 = 23 /* Offset in static TLS block */ + R_X86_64_PC64 R_X86_64 = 24 /* PC relative 64-bit sign extended symbol value. */ + R_X86_64_GOTOFF64 R_X86_64 = 25 + R_X86_64_GOTPC32 R_X86_64 = 26 + R_X86_64_GOT64 R_X86_64 = 27 + R_X86_64_GOTPCREL64 R_X86_64 = 28 + R_X86_64_GOTPC64 R_X86_64 = 29 + R_X86_64_GOTPLT64 R_X86_64 = 30 + R_X86_64_PLTOFF64 R_X86_64 = 31 + R_X86_64_SIZE32 R_X86_64 = 32 + R_X86_64_SIZE64 R_X86_64 = 33 + R_X86_64_GOTPC32_TLSDESC R_X86_64 = 34 + R_X86_64_TLSDESC_CALL R_X86_64 = 35 + R_X86_64_TLSDESC R_X86_64 = 36 + R_X86_64_IRELATIVE R_X86_64 = 37 + R_X86_64_RELATIVE64 R_X86_64 = 38 + R_X86_64_PC32_BND R_X86_64 = 39 + R_X86_64_PLT32_BND R_X86_64 = 40 + R_X86_64_GOTPCRELX R_X86_64 = 41 + R_X86_64_REX_GOTPCRELX R_X86_64 = 42 +) + +var rx86_64Strings = []intName{ + {0, "R_X86_64_NONE"}, + {1, "R_X86_64_64"}, + {2, "R_X86_64_PC32"}, + {3, "R_X86_64_GOT32"}, + {4, "R_X86_64_PLT32"}, + {5, "R_X86_64_COPY"}, + {6, "R_X86_64_GLOB_DAT"}, + {7, "R_X86_64_JMP_SLOT"}, + {8, "R_X86_64_RELATIVE"}, + {9, "R_X86_64_GOTPCREL"}, + {10, "R_X86_64_32"}, + {11, "R_X86_64_32S"}, + {12, "R_X86_64_16"}, + {13, "R_X86_64_PC16"}, + {14, "R_X86_64_8"}, + {15, "R_X86_64_PC8"}, + {16, "R_X86_64_DTPMOD64"}, + {17, "R_X86_64_DTPOFF64"}, + {18, "R_X86_64_TPOFF64"}, + {19, "R_X86_64_TLSGD"}, + {20, "R_X86_64_TLSLD"}, + {21, "R_X86_64_DTPOFF32"}, + {22, "R_X86_64_GOTTPOFF"}, + {23, "R_X86_64_TPOFF32"}, + {24, "R_X86_64_PC64"}, + {25, "R_X86_64_GOTOFF64"}, + {26, "R_X86_64_GOTPC32"}, + {27, "R_X86_64_GOT64"}, + {28, "R_X86_64_GOTPCREL64"}, + {29, "R_X86_64_GOTPC64"}, + {30, "R_X86_64_GOTPLT64"}, + {31, "R_X86_64_PLTOFF64"}, + {32, "R_X86_64_SIZE32"}, + {33, "R_X86_64_SIZE64"}, + {34, "R_X86_64_GOTPC32_TLSDESC"}, + {35, "R_X86_64_TLSDESC_CALL"}, + {36, "R_X86_64_TLSDESC"}, + {37, "R_X86_64_IRELATIVE"}, + {38, "R_X86_64_RELATIVE64"}, + {39, "R_X86_64_PC32_BND"}, + {40, "R_X86_64_PLT32_BND"}, + {41, "R_X86_64_GOTPCRELX"}, + {42, "R_X86_64_REX_GOTPCRELX"}, +} + +func (i R_X86_64) String() string { return stringName(uint32(i), rx86_64Strings, false) } +func (i R_X86_64) GoString() string { return stringName(uint32(i), rx86_64Strings, true) } + +// Relocation types for AArch64 (aka arm64) +type R_AARCH64 int + +const ( + R_AARCH64_NONE R_AARCH64 = 0 + R_AARCH64_P32_ABS32 R_AARCH64 = 1 + R_AARCH64_P32_ABS16 R_AARCH64 = 2 + R_AARCH64_P32_PREL32 R_AARCH64 = 3 + R_AARCH64_P32_PREL16 R_AARCH64 = 4 + R_AARCH64_P32_MOVW_UABS_G0 R_AARCH64 = 5 + R_AARCH64_P32_MOVW_UABS_G0_NC R_AARCH64 = 6 + R_AARCH64_P32_MOVW_UABS_G1 R_AARCH64 = 7 + R_AARCH64_P32_MOVW_SABS_G0 R_AARCH64 = 8 + R_AARCH64_P32_LD_PREL_LO19 R_AARCH64 = 9 + R_AARCH64_P32_ADR_PREL_LO21 R_AARCH64 = 10 + R_AARCH64_P32_ADR_PREL_PG_HI21 R_AARCH64 = 11 + R_AARCH64_P32_ADD_ABS_LO12_NC R_AARCH64 = 12 + R_AARCH64_P32_LDST8_ABS_LO12_NC R_AARCH64 = 13 + R_AARCH64_P32_LDST16_ABS_LO12_NC R_AARCH64 = 14 + R_AARCH64_P32_LDST32_ABS_LO12_NC R_AARCH64 = 15 + R_AARCH64_P32_LDST64_ABS_LO12_NC R_AARCH64 = 16 + R_AARCH64_P32_LDST128_ABS_LO12_NC R_AARCH64 = 17 + R_AARCH64_P32_TSTBR14 R_AARCH64 = 18 + R_AARCH64_P32_CONDBR19 R_AARCH64 = 19 + R_AARCH64_P32_JUMP26 R_AARCH64 = 20 + R_AARCH64_P32_CALL26 R_AARCH64 = 21 + R_AARCH64_P32_GOT_LD_PREL19 R_AARCH64 = 25 + R_AARCH64_P32_ADR_GOT_PAGE R_AARCH64 = 26 + R_AARCH64_P32_LD32_GOT_LO12_NC R_AARCH64 = 27 + R_AARCH64_P32_TLSGD_ADR_PAGE21 R_AARCH64 = 81 + R_AARCH64_P32_TLSGD_ADD_LO12_NC R_AARCH64 = 82 + R_AARCH64_P32_TLSIE_ADR_GOTTPREL_PAGE21 R_AARCH64 = 103 + R_AARCH64_P32_TLSIE_LD32_GOTTPREL_LO12_NC R_AARCH64 = 104 + R_AARCH64_P32_TLSIE_LD_GOTTPREL_PREL19 R_AARCH64 = 105 + R_AARCH64_P32_TLSLE_MOVW_TPREL_G1 R_AARCH64 = 106 + R_AARCH64_P32_TLSLE_MOVW_TPREL_G0 R_AARCH64 = 107 + R_AARCH64_P32_TLSLE_MOVW_TPREL_G0_NC R_AARCH64 = 108 + R_AARCH64_P32_TLSLE_ADD_TPREL_HI12 R_AARCH64 = 109 + R_AARCH64_P32_TLSLE_ADD_TPREL_LO12 R_AARCH64 = 110 + R_AARCH64_P32_TLSLE_ADD_TPREL_LO12_NC R_AARCH64 = 111 + R_AARCH64_P32_TLSDESC_LD_PREL19 R_AARCH64 = 122 + R_AARCH64_P32_TLSDESC_ADR_PREL21 R_AARCH64 = 123 + R_AARCH64_P32_TLSDESC_ADR_PAGE21 R_AARCH64 = 124 + R_AARCH64_P32_TLSDESC_LD32_LO12_NC R_AARCH64 = 125 + R_AARCH64_P32_TLSDESC_ADD_LO12_NC R_AARCH64 = 126 + R_AARCH64_P32_TLSDESC_CALL R_AARCH64 = 127 + R_AARCH64_P32_COPY R_AARCH64 = 180 + R_AARCH64_P32_GLOB_DAT R_AARCH64 = 181 + R_AARCH64_P32_JUMP_SLOT R_AARCH64 = 182 + R_AARCH64_P32_RELATIVE R_AARCH64 = 183 + R_AARCH64_P32_TLS_DTPMOD R_AARCH64 = 184 + R_AARCH64_P32_TLS_DTPREL R_AARCH64 = 185 + R_AARCH64_P32_TLS_TPREL R_AARCH64 = 186 + R_AARCH64_P32_TLSDESC R_AARCH64 = 187 + R_AARCH64_P32_IRELATIVE R_AARCH64 = 188 + R_AARCH64_NULL R_AARCH64 = 256 + R_AARCH64_ABS64 R_AARCH64 = 257 + R_AARCH64_ABS32 R_AARCH64 = 258 + R_AARCH64_ABS16 R_AARCH64 = 259 + R_AARCH64_PREL64 R_AARCH64 = 260 + R_AARCH64_PREL32 R_AARCH64 = 261 + R_AARCH64_PREL16 R_AARCH64 = 262 + R_AARCH64_MOVW_UABS_G0 R_AARCH64 = 263 + R_AARCH64_MOVW_UABS_G0_NC R_AARCH64 = 264 + R_AARCH64_MOVW_UABS_G1 R_AARCH64 = 265 + R_AARCH64_MOVW_UABS_G1_NC R_AARCH64 = 266 + R_AARCH64_MOVW_UABS_G2 R_AARCH64 = 267 + R_AARCH64_MOVW_UABS_G2_NC R_AARCH64 = 268 + R_AARCH64_MOVW_UABS_G3 R_AARCH64 = 269 + R_AARCH64_MOVW_SABS_G0 R_AARCH64 = 270 + R_AARCH64_MOVW_SABS_G1 R_AARCH64 = 271 + R_AARCH64_MOVW_SABS_G2 R_AARCH64 = 272 + R_AARCH64_LD_PREL_LO19 R_AARCH64 = 273 + R_AARCH64_ADR_PREL_LO21 R_AARCH64 = 274 + R_AARCH64_ADR_PREL_PG_HI21 R_AARCH64 = 275 + R_AARCH64_ADR_PREL_PG_HI21_NC R_AARCH64 = 276 + R_AARCH64_ADD_ABS_LO12_NC R_AARCH64 = 277 + R_AARCH64_LDST8_ABS_LO12_NC R_AARCH64 = 278 + R_AARCH64_TSTBR14 R_AARCH64 = 279 + R_AARCH64_CONDBR19 R_AARCH64 = 280 + R_AARCH64_JUMP26 R_AARCH64 = 282 + R_AARCH64_CALL26 R_AARCH64 = 283 + R_AARCH64_LDST16_ABS_LO12_NC R_AARCH64 = 284 + R_AARCH64_LDST32_ABS_LO12_NC R_AARCH64 = 285 + R_AARCH64_LDST64_ABS_LO12_NC R_AARCH64 = 286 + R_AARCH64_LDST128_ABS_LO12_NC R_AARCH64 = 299 + R_AARCH64_GOT_LD_PREL19 R_AARCH64 = 309 + R_AARCH64_LD64_GOTOFF_LO15 R_AARCH64 = 310 + R_AARCH64_ADR_GOT_PAGE R_AARCH64 = 311 + R_AARCH64_LD64_GOT_LO12_NC R_AARCH64 = 312 + R_AARCH64_LD64_GOTPAGE_LO15 R_AARCH64 = 313 + R_AARCH64_TLSGD_ADR_PREL21 R_AARCH64 = 512 + R_AARCH64_TLSGD_ADR_PAGE21 R_AARCH64 = 513 + R_AARCH64_TLSGD_ADD_LO12_NC R_AARCH64 = 514 + R_AARCH64_TLSGD_MOVW_G1 R_AARCH64 = 515 + R_AARCH64_TLSGD_MOVW_G0_NC R_AARCH64 = 516 + R_AARCH64_TLSLD_ADR_PREL21 R_AARCH64 = 517 + R_AARCH64_TLSLD_ADR_PAGE21 R_AARCH64 = 518 + R_AARCH64_TLSIE_MOVW_GOTTPREL_G1 R_AARCH64 = 539 + R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC R_AARCH64 = 540 + R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21 R_AARCH64 = 541 + R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC R_AARCH64 = 542 + R_AARCH64_TLSIE_LD_GOTTPREL_PREL19 R_AARCH64 = 543 + R_AARCH64_TLSLE_MOVW_TPREL_G2 R_AARCH64 = 544 + R_AARCH64_TLSLE_MOVW_TPREL_G1 R_AARCH64 = 545 + R_AARCH64_TLSLE_MOVW_TPREL_G1_NC R_AARCH64 = 546 + R_AARCH64_TLSLE_MOVW_TPREL_G0 R_AARCH64 = 547 + R_AARCH64_TLSLE_MOVW_TPREL_G0_NC R_AARCH64 = 548 + R_AARCH64_TLSLE_ADD_TPREL_HI12 R_AARCH64 = 549 + R_AARCH64_TLSLE_ADD_TPREL_LO12 R_AARCH64 = 550 + R_AARCH64_TLSLE_ADD_TPREL_LO12_NC R_AARCH64 = 551 + R_AARCH64_TLSDESC_LD_PREL19 R_AARCH64 = 560 + R_AARCH64_TLSDESC_ADR_PREL21 R_AARCH64 = 561 + R_AARCH64_TLSDESC_ADR_PAGE21 R_AARCH64 = 562 + R_AARCH64_TLSDESC_LD64_LO12_NC R_AARCH64 = 563 + R_AARCH64_TLSDESC_ADD_LO12_NC R_AARCH64 = 564 + R_AARCH64_TLSDESC_OFF_G1 R_AARCH64 = 565 + R_AARCH64_TLSDESC_OFF_G0_NC R_AARCH64 = 566 + R_AARCH64_TLSDESC_LDR R_AARCH64 = 567 + R_AARCH64_TLSDESC_ADD R_AARCH64 = 568 + R_AARCH64_TLSDESC_CALL R_AARCH64 = 569 + R_AARCH64_TLSLE_LDST128_TPREL_LO12 R_AARCH64 = 570 + R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC R_AARCH64 = 571 + R_AARCH64_TLSLD_LDST128_DTPREL_LO12 R_AARCH64 = 572 + R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC R_AARCH64 = 573 + R_AARCH64_COPY R_AARCH64 = 1024 + R_AARCH64_GLOB_DAT R_AARCH64 = 1025 + R_AARCH64_JUMP_SLOT R_AARCH64 = 1026 + R_AARCH64_RELATIVE R_AARCH64 = 1027 + R_AARCH64_TLS_DTPMOD64 R_AARCH64 = 1028 + R_AARCH64_TLS_DTPREL64 R_AARCH64 = 1029 + R_AARCH64_TLS_TPREL64 R_AARCH64 = 1030 + R_AARCH64_TLSDESC R_AARCH64 = 1031 + R_AARCH64_IRELATIVE R_AARCH64 = 1032 +) + +var raarch64Strings = []intName{ + {0, "R_AARCH64_NONE"}, + {1, "R_AARCH64_P32_ABS32"}, + {2, "R_AARCH64_P32_ABS16"}, + {3, "R_AARCH64_P32_PREL32"}, + {4, "R_AARCH64_P32_PREL16"}, + {5, "R_AARCH64_P32_MOVW_UABS_G0"}, + {6, "R_AARCH64_P32_MOVW_UABS_G0_NC"}, + {7, "R_AARCH64_P32_MOVW_UABS_G1"}, + {8, "R_AARCH64_P32_MOVW_SABS_G0"}, + {9, "R_AARCH64_P32_LD_PREL_LO19"}, + {10, "R_AARCH64_P32_ADR_PREL_LO21"}, + {11, "R_AARCH64_P32_ADR_PREL_PG_HI21"}, + {12, "R_AARCH64_P32_ADD_ABS_LO12_NC"}, + {13, "R_AARCH64_P32_LDST8_ABS_LO12_NC"}, + {14, "R_AARCH64_P32_LDST16_ABS_LO12_NC"}, + {15, "R_AARCH64_P32_LDST32_ABS_LO12_NC"}, + {16, "R_AARCH64_P32_LDST64_ABS_LO12_NC"}, + {17, "R_AARCH64_P32_LDST128_ABS_LO12_NC"}, + {18, "R_AARCH64_P32_TSTBR14"}, + {19, "R_AARCH64_P32_CONDBR19"}, + {20, "R_AARCH64_P32_JUMP26"}, + {21, "R_AARCH64_P32_CALL26"}, + {25, "R_AARCH64_P32_GOT_LD_PREL19"}, + {26, "R_AARCH64_P32_ADR_GOT_PAGE"}, + {27, "R_AARCH64_P32_LD32_GOT_LO12_NC"}, + {81, "R_AARCH64_P32_TLSGD_ADR_PAGE21"}, + {82, "R_AARCH64_P32_TLSGD_ADD_LO12_NC"}, + {103, "R_AARCH64_P32_TLSIE_ADR_GOTTPREL_PAGE21"}, + {104, "R_AARCH64_P32_TLSIE_LD32_GOTTPREL_LO12_NC"}, + {105, "R_AARCH64_P32_TLSIE_LD_GOTTPREL_PREL19"}, + {106, "R_AARCH64_P32_TLSLE_MOVW_TPREL_G1"}, + {107, "R_AARCH64_P32_TLSLE_MOVW_TPREL_G0"}, + {108, "R_AARCH64_P32_TLSLE_MOVW_TPREL_G0_NC"}, + {109, "R_AARCH64_P32_TLSLE_ADD_TPREL_HI12"}, + {110, "R_AARCH64_P32_TLSLE_ADD_TPREL_LO12"}, + {111, "R_AARCH64_P32_TLSLE_ADD_TPREL_LO12_NC"}, + {122, "R_AARCH64_P32_TLSDESC_LD_PREL19"}, + {123, "R_AARCH64_P32_TLSDESC_ADR_PREL21"}, + {124, "R_AARCH64_P32_TLSDESC_ADR_PAGE21"}, + {125, "R_AARCH64_P32_TLSDESC_LD32_LO12_NC"}, + {126, "R_AARCH64_P32_TLSDESC_ADD_LO12_NC"}, + {127, "R_AARCH64_P32_TLSDESC_CALL"}, + {180, "R_AARCH64_P32_COPY"}, + {181, "R_AARCH64_P32_GLOB_DAT"}, + {182, "R_AARCH64_P32_JUMP_SLOT"}, + {183, "R_AARCH64_P32_RELATIVE"}, + {184, "R_AARCH64_P32_TLS_DTPMOD"}, + {185, "R_AARCH64_P32_TLS_DTPREL"}, + {186, "R_AARCH64_P32_TLS_TPREL"}, + {187, "R_AARCH64_P32_TLSDESC"}, + {188, "R_AARCH64_P32_IRELATIVE"}, + {256, "R_AARCH64_NULL"}, + {257, "R_AARCH64_ABS64"}, + {258, "R_AARCH64_ABS32"}, + {259, "R_AARCH64_ABS16"}, + {260, "R_AARCH64_PREL64"}, + {261, "R_AARCH64_PREL32"}, + {262, "R_AARCH64_PREL16"}, + {263, "R_AARCH64_MOVW_UABS_G0"}, + {264, "R_AARCH64_MOVW_UABS_G0_NC"}, + {265, "R_AARCH64_MOVW_UABS_G1"}, + {266, "R_AARCH64_MOVW_UABS_G1_NC"}, + {267, "R_AARCH64_MOVW_UABS_G2"}, + {268, "R_AARCH64_MOVW_UABS_G2_NC"}, + {269, "R_AARCH64_MOVW_UABS_G3"}, + {270, "R_AARCH64_MOVW_SABS_G0"}, + {271, "R_AARCH64_MOVW_SABS_G1"}, + {272, "R_AARCH64_MOVW_SABS_G2"}, + {273, "R_AARCH64_LD_PREL_LO19"}, + {274, "R_AARCH64_ADR_PREL_LO21"}, + {275, "R_AARCH64_ADR_PREL_PG_HI21"}, + {276, "R_AARCH64_ADR_PREL_PG_HI21_NC"}, + {277, "R_AARCH64_ADD_ABS_LO12_NC"}, + {278, "R_AARCH64_LDST8_ABS_LO12_NC"}, + {279, "R_AARCH64_TSTBR14"}, + {280, "R_AARCH64_CONDBR19"}, + {282, "R_AARCH64_JUMP26"}, + {283, "R_AARCH64_CALL26"}, + {284, "R_AARCH64_LDST16_ABS_LO12_NC"}, + {285, "R_AARCH64_LDST32_ABS_LO12_NC"}, + {286, "R_AARCH64_LDST64_ABS_LO12_NC"}, + {299, "R_AARCH64_LDST128_ABS_LO12_NC"}, + {309, "R_AARCH64_GOT_LD_PREL19"}, + {310, "R_AARCH64_LD64_GOTOFF_LO15"}, + {311, "R_AARCH64_ADR_GOT_PAGE"}, + {312, "R_AARCH64_LD64_GOT_LO12_NC"}, + {313, "R_AARCH64_LD64_GOTPAGE_LO15"}, + {512, "R_AARCH64_TLSGD_ADR_PREL21"}, + {513, "R_AARCH64_TLSGD_ADR_PAGE21"}, + {514, "R_AARCH64_TLSGD_ADD_LO12_NC"}, + {515, "R_AARCH64_TLSGD_MOVW_G1"}, + {516, "R_AARCH64_TLSGD_MOVW_G0_NC"}, + {517, "R_AARCH64_TLSLD_ADR_PREL21"}, + {518, "R_AARCH64_TLSLD_ADR_PAGE21"}, + {539, "R_AARCH64_TLSIE_MOVW_GOTTPREL_G1"}, + {540, "R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC"}, + {541, "R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21"}, + {542, "R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC"}, + {543, "R_AARCH64_TLSIE_LD_GOTTPREL_PREL19"}, + {544, "R_AARCH64_TLSLE_MOVW_TPREL_G2"}, + {545, "R_AARCH64_TLSLE_MOVW_TPREL_G1"}, + {546, "R_AARCH64_TLSLE_MOVW_TPREL_G1_NC"}, + {547, "R_AARCH64_TLSLE_MOVW_TPREL_G0"}, + {548, "R_AARCH64_TLSLE_MOVW_TPREL_G0_NC"}, + {549, "R_AARCH64_TLSLE_ADD_TPREL_HI12"}, + {550, "R_AARCH64_TLSLE_ADD_TPREL_LO12"}, + {551, "R_AARCH64_TLSLE_ADD_TPREL_LO12_NC"}, + {560, "R_AARCH64_TLSDESC_LD_PREL19"}, + {561, "R_AARCH64_TLSDESC_ADR_PREL21"}, + {562, "R_AARCH64_TLSDESC_ADR_PAGE21"}, + {563, "R_AARCH64_TLSDESC_LD64_LO12_NC"}, + {564, "R_AARCH64_TLSDESC_ADD_LO12_NC"}, + {565, "R_AARCH64_TLSDESC_OFF_G1"}, + {566, "R_AARCH64_TLSDESC_OFF_G0_NC"}, + {567, "R_AARCH64_TLSDESC_LDR"}, + {568, "R_AARCH64_TLSDESC_ADD"}, + {569, "R_AARCH64_TLSDESC_CALL"}, + {570, "R_AARCH64_TLSLE_LDST128_TPREL_LO12"}, + {571, "R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC"}, + {572, "R_AARCH64_TLSLD_LDST128_DTPREL_LO12"}, + {573, "R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC"}, + {1024, "R_AARCH64_COPY"}, + {1025, "R_AARCH64_GLOB_DAT"}, + {1026, "R_AARCH64_JUMP_SLOT"}, + {1027, "R_AARCH64_RELATIVE"}, + {1028, "R_AARCH64_TLS_DTPMOD64"}, + {1029, "R_AARCH64_TLS_DTPREL64"}, + {1030, "R_AARCH64_TLS_TPREL64"}, + {1031, "R_AARCH64_TLSDESC"}, + {1032, "R_AARCH64_IRELATIVE"}, +} + +func (i R_AARCH64) String() string { return stringName(uint32(i), raarch64Strings, false) } +func (i R_AARCH64) GoString() string { return stringName(uint32(i), raarch64Strings, true) } + +// Relocation types for Alpha. +type R_ALPHA int + +const ( + R_ALPHA_NONE R_ALPHA = 0 /* No reloc */ + R_ALPHA_REFLONG R_ALPHA = 1 /* Direct 32 bit */ + R_ALPHA_REFQUAD R_ALPHA = 2 /* Direct 64 bit */ + R_ALPHA_GPREL32 R_ALPHA = 3 /* GP relative 32 bit */ + R_ALPHA_LITERAL R_ALPHA = 4 /* GP relative 16 bit w/optimization */ + R_ALPHA_LITUSE R_ALPHA = 5 /* Optimization hint for LITERAL */ + R_ALPHA_GPDISP R_ALPHA = 6 /* Add displacement to GP */ + R_ALPHA_BRADDR R_ALPHA = 7 /* PC+4 relative 23 bit shifted */ + R_ALPHA_HINT R_ALPHA = 8 /* PC+4 relative 16 bit shifted */ + R_ALPHA_SREL16 R_ALPHA = 9 /* PC relative 16 bit */ + R_ALPHA_SREL32 R_ALPHA = 10 /* PC relative 32 bit */ + R_ALPHA_SREL64 R_ALPHA = 11 /* PC relative 64 bit */ + R_ALPHA_OP_PUSH R_ALPHA = 12 /* OP stack push */ + R_ALPHA_OP_STORE R_ALPHA = 13 /* OP stack pop and store */ + R_ALPHA_OP_PSUB R_ALPHA = 14 /* OP stack subtract */ + R_ALPHA_OP_PRSHIFT R_ALPHA = 15 /* OP stack right shift */ + R_ALPHA_GPVALUE R_ALPHA = 16 + R_ALPHA_GPRELHIGH R_ALPHA = 17 + R_ALPHA_GPRELLOW R_ALPHA = 18 + R_ALPHA_IMMED_GP_16 R_ALPHA = 19 + R_ALPHA_IMMED_GP_HI32 R_ALPHA = 20 + R_ALPHA_IMMED_SCN_HI32 R_ALPHA = 21 + R_ALPHA_IMMED_BR_HI32 R_ALPHA = 22 + R_ALPHA_IMMED_LO32 R_ALPHA = 23 + R_ALPHA_COPY R_ALPHA = 24 /* Copy symbol at runtime */ + R_ALPHA_GLOB_DAT R_ALPHA = 25 /* Create GOT entry */ + R_ALPHA_JMP_SLOT R_ALPHA = 26 /* Create PLT entry */ + R_ALPHA_RELATIVE R_ALPHA = 27 /* Adjust by program base */ +) + +var ralphaStrings = []intName{ + {0, "R_ALPHA_NONE"}, + {1, "R_ALPHA_REFLONG"}, + {2, "R_ALPHA_REFQUAD"}, + {3, "R_ALPHA_GPREL32"}, + {4, "R_ALPHA_LITERAL"}, + {5, "R_ALPHA_LITUSE"}, + {6, "R_ALPHA_GPDISP"}, + {7, "R_ALPHA_BRADDR"}, + {8, "R_ALPHA_HINT"}, + {9, "R_ALPHA_SREL16"}, + {10, "R_ALPHA_SREL32"}, + {11, "R_ALPHA_SREL64"}, + {12, "R_ALPHA_OP_PUSH"}, + {13, "R_ALPHA_OP_STORE"}, + {14, "R_ALPHA_OP_PSUB"}, + {15, "R_ALPHA_OP_PRSHIFT"}, + {16, "R_ALPHA_GPVALUE"}, + {17, "R_ALPHA_GPRELHIGH"}, + {18, "R_ALPHA_GPRELLOW"}, + {19, "R_ALPHA_IMMED_GP_16"}, + {20, "R_ALPHA_IMMED_GP_HI32"}, + {21, "R_ALPHA_IMMED_SCN_HI32"}, + {22, "R_ALPHA_IMMED_BR_HI32"}, + {23, "R_ALPHA_IMMED_LO32"}, + {24, "R_ALPHA_COPY"}, + {25, "R_ALPHA_GLOB_DAT"}, + {26, "R_ALPHA_JMP_SLOT"}, + {27, "R_ALPHA_RELATIVE"}, +} + +func (i R_ALPHA) String() string { return stringName(uint32(i), ralphaStrings, false) } +func (i R_ALPHA) GoString() string { return stringName(uint32(i), ralphaStrings, true) } + +// Relocation types for ARM. +type R_ARM int + +const ( + R_ARM_NONE R_ARM = 0 /* No relocation. */ + R_ARM_PC24 R_ARM = 1 + R_ARM_ABS32 R_ARM = 2 + R_ARM_REL32 R_ARM = 3 + R_ARM_PC13 R_ARM = 4 + R_ARM_ABS16 R_ARM = 5 + R_ARM_ABS12 R_ARM = 6 + R_ARM_THM_ABS5 R_ARM = 7 + R_ARM_ABS8 R_ARM = 8 + R_ARM_SBREL32 R_ARM = 9 + R_ARM_THM_PC22 R_ARM = 10 + R_ARM_THM_PC8 R_ARM = 11 + R_ARM_AMP_VCALL9 R_ARM = 12 + R_ARM_SWI24 R_ARM = 13 + R_ARM_THM_SWI8 R_ARM = 14 + R_ARM_XPC25 R_ARM = 15 + R_ARM_THM_XPC22 R_ARM = 16 + R_ARM_TLS_DTPMOD32 R_ARM = 17 + R_ARM_TLS_DTPOFF32 R_ARM = 18 + R_ARM_TLS_TPOFF32 R_ARM = 19 + R_ARM_COPY R_ARM = 20 /* Copy data from shared object. */ + R_ARM_GLOB_DAT R_ARM = 21 /* Set GOT entry to data address. */ + R_ARM_JUMP_SLOT R_ARM = 22 /* Set GOT entry to code address. */ + R_ARM_RELATIVE R_ARM = 23 /* Add load address of shared object. */ + R_ARM_GOTOFF R_ARM = 24 /* Add GOT-relative symbol address. */ + R_ARM_GOTPC R_ARM = 25 /* Add PC-relative GOT table address. */ + R_ARM_GOT32 R_ARM = 26 /* Add PC-relative GOT offset. */ + R_ARM_PLT32 R_ARM = 27 /* Add PC-relative PLT offset. */ + R_ARM_CALL R_ARM = 28 + R_ARM_JUMP24 R_ARM = 29 + R_ARM_THM_JUMP24 R_ARM = 30 + R_ARM_BASE_ABS R_ARM = 31 + R_ARM_ALU_PCREL_7_0 R_ARM = 32 + R_ARM_ALU_PCREL_15_8 R_ARM = 33 + R_ARM_ALU_PCREL_23_15 R_ARM = 34 + R_ARM_LDR_SBREL_11_10_NC R_ARM = 35 + R_ARM_ALU_SBREL_19_12_NC R_ARM = 36 + R_ARM_ALU_SBREL_27_20_CK R_ARM = 37 + R_ARM_TARGET1 R_ARM = 38 + R_ARM_SBREL31 R_ARM = 39 + R_ARM_V4BX R_ARM = 40 + R_ARM_TARGET2 R_ARM = 41 + R_ARM_PREL31 R_ARM = 42 + R_ARM_MOVW_ABS_NC R_ARM = 43 + R_ARM_MOVT_ABS R_ARM = 44 + R_ARM_MOVW_PREL_NC R_ARM = 45 + R_ARM_MOVT_PREL R_ARM = 46 + R_ARM_THM_MOVW_ABS_NC R_ARM = 47 + R_ARM_THM_MOVT_ABS R_ARM = 48 + R_ARM_THM_MOVW_PREL_NC R_ARM = 49 + R_ARM_THM_MOVT_PREL R_ARM = 50 + R_ARM_THM_JUMP19 R_ARM = 51 + R_ARM_THM_JUMP6 R_ARM = 52 + R_ARM_THM_ALU_PREL_11_0 R_ARM = 53 + R_ARM_THM_PC12 R_ARM = 54 + R_ARM_ABS32_NOI R_ARM = 55 + R_ARM_REL32_NOI R_ARM = 56 + R_ARM_ALU_PC_G0_NC R_ARM = 57 + R_ARM_ALU_PC_G0 R_ARM = 58 + R_ARM_ALU_PC_G1_NC R_ARM = 59 + R_ARM_ALU_PC_G1 R_ARM = 60 + R_ARM_ALU_PC_G2 R_ARM = 61 + R_ARM_LDR_PC_G1 R_ARM = 62 + R_ARM_LDR_PC_G2 R_ARM = 63 + R_ARM_LDRS_PC_G0 R_ARM = 64 + R_ARM_LDRS_PC_G1 R_ARM = 65 + R_ARM_LDRS_PC_G2 R_ARM = 66 + R_ARM_LDC_PC_G0 R_ARM = 67 + R_ARM_LDC_PC_G1 R_ARM = 68 + R_ARM_LDC_PC_G2 R_ARM = 69 + R_ARM_ALU_SB_G0_NC R_ARM = 70 + R_ARM_ALU_SB_G0 R_ARM = 71 + R_ARM_ALU_SB_G1_NC R_ARM = 72 + R_ARM_ALU_SB_G1 R_ARM = 73 + R_ARM_ALU_SB_G2 R_ARM = 74 + R_ARM_LDR_SB_G0 R_ARM = 75 + R_ARM_LDR_SB_G1 R_ARM = 76 + R_ARM_LDR_SB_G2 R_ARM = 77 + R_ARM_LDRS_SB_G0 R_ARM = 78 + R_ARM_LDRS_SB_G1 R_ARM = 79 + R_ARM_LDRS_SB_G2 R_ARM = 80 + R_ARM_LDC_SB_G0 R_ARM = 81 + R_ARM_LDC_SB_G1 R_ARM = 82 + R_ARM_LDC_SB_G2 R_ARM = 83 + R_ARM_MOVW_BREL_NC R_ARM = 84 + R_ARM_MOVT_BREL R_ARM = 85 + R_ARM_MOVW_BREL R_ARM = 86 + R_ARM_THM_MOVW_BREL_NC R_ARM = 87 + R_ARM_THM_MOVT_BREL R_ARM = 88 + R_ARM_THM_MOVW_BREL R_ARM = 89 + R_ARM_TLS_GOTDESC R_ARM = 90 + R_ARM_TLS_CALL R_ARM = 91 + R_ARM_TLS_DESCSEQ R_ARM = 92 + R_ARM_THM_TLS_CALL R_ARM = 93 + R_ARM_PLT32_ABS R_ARM = 94 + R_ARM_GOT_ABS R_ARM = 95 + R_ARM_GOT_PREL R_ARM = 96 + R_ARM_GOT_BREL12 R_ARM = 97 + R_ARM_GOTOFF12 R_ARM = 98 + R_ARM_GOTRELAX R_ARM = 99 + R_ARM_GNU_VTENTRY R_ARM = 100 + R_ARM_GNU_VTINHERIT R_ARM = 101 + R_ARM_THM_JUMP11 R_ARM = 102 + R_ARM_THM_JUMP8 R_ARM = 103 + R_ARM_TLS_GD32 R_ARM = 104 + R_ARM_TLS_LDM32 R_ARM = 105 + R_ARM_TLS_LDO32 R_ARM = 106 + R_ARM_TLS_IE32 R_ARM = 107 + R_ARM_TLS_LE32 R_ARM = 108 + R_ARM_TLS_LDO12 R_ARM = 109 + R_ARM_TLS_LE12 R_ARM = 110 + R_ARM_TLS_IE12GP R_ARM = 111 + R_ARM_PRIVATE_0 R_ARM = 112 + R_ARM_PRIVATE_1 R_ARM = 113 + R_ARM_PRIVATE_2 R_ARM = 114 + R_ARM_PRIVATE_3 R_ARM = 115 + R_ARM_PRIVATE_4 R_ARM = 116 + R_ARM_PRIVATE_5 R_ARM = 117 + R_ARM_PRIVATE_6 R_ARM = 118 + R_ARM_PRIVATE_7 R_ARM = 119 + R_ARM_PRIVATE_8 R_ARM = 120 + R_ARM_PRIVATE_9 R_ARM = 121 + R_ARM_PRIVATE_10 R_ARM = 122 + R_ARM_PRIVATE_11 R_ARM = 123 + R_ARM_PRIVATE_12 R_ARM = 124 + R_ARM_PRIVATE_13 R_ARM = 125 + R_ARM_PRIVATE_14 R_ARM = 126 + R_ARM_PRIVATE_15 R_ARM = 127 + R_ARM_ME_TOO R_ARM = 128 + R_ARM_THM_TLS_DESCSEQ16 R_ARM = 129 + R_ARM_THM_TLS_DESCSEQ32 R_ARM = 130 + R_ARM_THM_GOT_BREL12 R_ARM = 131 + R_ARM_THM_ALU_ABS_G0_NC R_ARM = 132 + R_ARM_THM_ALU_ABS_G1_NC R_ARM = 133 + R_ARM_THM_ALU_ABS_G2_NC R_ARM = 134 + R_ARM_THM_ALU_ABS_G3 R_ARM = 135 + R_ARM_IRELATIVE R_ARM = 160 + R_ARM_RXPC25 R_ARM = 249 + R_ARM_RSBREL32 R_ARM = 250 + R_ARM_THM_RPC22 R_ARM = 251 + R_ARM_RREL32 R_ARM = 252 + R_ARM_RABS32 R_ARM = 253 + R_ARM_RPC24 R_ARM = 254 + R_ARM_RBASE R_ARM = 255 +) + +var rarmStrings = []intName{ + {0, "R_ARM_NONE"}, + {1, "R_ARM_PC24"}, + {2, "R_ARM_ABS32"}, + {3, "R_ARM_REL32"}, + {4, "R_ARM_PC13"}, + {5, "R_ARM_ABS16"}, + {6, "R_ARM_ABS12"}, + {7, "R_ARM_THM_ABS5"}, + {8, "R_ARM_ABS8"}, + {9, "R_ARM_SBREL32"}, + {10, "R_ARM_THM_PC22"}, + {11, "R_ARM_THM_PC8"}, + {12, "R_ARM_AMP_VCALL9"}, + {13, "R_ARM_SWI24"}, + {14, "R_ARM_THM_SWI8"}, + {15, "R_ARM_XPC25"}, + {16, "R_ARM_THM_XPC22"}, + {17, "R_ARM_TLS_DTPMOD32"}, + {18, "R_ARM_TLS_DTPOFF32"}, + {19, "R_ARM_TLS_TPOFF32"}, + {20, "R_ARM_COPY"}, + {21, "R_ARM_GLOB_DAT"}, + {22, "R_ARM_JUMP_SLOT"}, + {23, "R_ARM_RELATIVE"}, + {24, "R_ARM_GOTOFF"}, + {25, "R_ARM_GOTPC"}, + {26, "R_ARM_GOT32"}, + {27, "R_ARM_PLT32"}, + {28, "R_ARM_CALL"}, + {29, "R_ARM_JUMP24"}, + {30, "R_ARM_THM_JUMP24"}, + {31, "R_ARM_BASE_ABS"}, + {32, "R_ARM_ALU_PCREL_7_0"}, + {33, "R_ARM_ALU_PCREL_15_8"}, + {34, "R_ARM_ALU_PCREL_23_15"}, + {35, "R_ARM_LDR_SBREL_11_10_NC"}, + {36, "R_ARM_ALU_SBREL_19_12_NC"}, + {37, "R_ARM_ALU_SBREL_27_20_CK"}, + {38, "R_ARM_TARGET1"}, + {39, "R_ARM_SBREL31"}, + {40, "R_ARM_V4BX"}, + {41, "R_ARM_TARGET2"}, + {42, "R_ARM_PREL31"}, + {43, "R_ARM_MOVW_ABS_NC"}, + {44, "R_ARM_MOVT_ABS"}, + {45, "R_ARM_MOVW_PREL_NC"}, + {46, "R_ARM_MOVT_PREL"}, + {47, "R_ARM_THM_MOVW_ABS_NC"}, + {48, "R_ARM_THM_MOVT_ABS"}, + {49, "R_ARM_THM_MOVW_PREL_NC"}, + {50, "R_ARM_THM_MOVT_PREL"}, + {51, "R_ARM_THM_JUMP19"}, + {52, "R_ARM_THM_JUMP6"}, + {53, "R_ARM_THM_ALU_PREL_11_0"}, + {54, "R_ARM_THM_PC12"}, + {55, "R_ARM_ABS32_NOI"}, + {56, "R_ARM_REL32_NOI"}, + {57, "R_ARM_ALU_PC_G0_NC"}, + {58, "R_ARM_ALU_PC_G0"}, + {59, "R_ARM_ALU_PC_G1_NC"}, + {60, "R_ARM_ALU_PC_G1"}, + {61, "R_ARM_ALU_PC_G2"}, + {62, "R_ARM_LDR_PC_G1"}, + {63, "R_ARM_LDR_PC_G2"}, + {64, "R_ARM_LDRS_PC_G0"}, + {65, "R_ARM_LDRS_PC_G1"}, + {66, "R_ARM_LDRS_PC_G2"}, + {67, "R_ARM_LDC_PC_G0"}, + {68, "R_ARM_LDC_PC_G1"}, + {69, "R_ARM_LDC_PC_G2"}, + {70, "R_ARM_ALU_SB_G0_NC"}, + {71, "R_ARM_ALU_SB_G0"}, + {72, "R_ARM_ALU_SB_G1_NC"}, + {73, "R_ARM_ALU_SB_G1"}, + {74, "R_ARM_ALU_SB_G2"}, + {75, "R_ARM_LDR_SB_G0"}, + {76, "R_ARM_LDR_SB_G1"}, + {77, "R_ARM_LDR_SB_G2"}, + {78, "R_ARM_LDRS_SB_G0"}, + {79, "R_ARM_LDRS_SB_G1"}, + {80, "R_ARM_LDRS_SB_G2"}, + {81, "R_ARM_LDC_SB_G0"}, + {82, "R_ARM_LDC_SB_G1"}, + {83, "R_ARM_LDC_SB_G2"}, + {84, "R_ARM_MOVW_BREL_NC"}, + {85, "R_ARM_MOVT_BREL"}, + {86, "R_ARM_MOVW_BREL"}, + {87, "R_ARM_THM_MOVW_BREL_NC"}, + {88, "R_ARM_THM_MOVT_BREL"}, + {89, "R_ARM_THM_MOVW_BREL"}, + {90, "R_ARM_TLS_GOTDESC"}, + {91, "R_ARM_TLS_CALL"}, + {92, "R_ARM_TLS_DESCSEQ"}, + {93, "R_ARM_THM_TLS_CALL"}, + {94, "R_ARM_PLT32_ABS"}, + {95, "R_ARM_GOT_ABS"}, + {96, "R_ARM_GOT_PREL"}, + {97, "R_ARM_GOT_BREL12"}, + {98, "R_ARM_GOTOFF12"}, + {99, "R_ARM_GOTRELAX"}, + {100, "R_ARM_GNU_VTENTRY"}, + {101, "R_ARM_GNU_VTINHERIT"}, + {102, "R_ARM_THM_JUMP11"}, + {103, "R_ARM_THM_JUMP8"}, + {104, "R_ARM_TLS_GD32"}, + {105, "R_ARM_TLS_LDM32"}, + {106, "R_ARM_TLS_LDO32"}, + {107, "R_ARM_TLS_IE32"}, + {108, "R_ARM_TLS_LE32"}, + {109, "R_ARM_TLS_LDO12"}, + {110, "R_ARM_TLS_LE12"}, + {111, "R_ARM_TLS_IE12GP"}, + {112, "R_ARM_PRIVATE_0"}, + {113, "R_ARM_PRIVATE_1"}, + {114, "R_ARM_PRIVATE_2"}, + {115, "R_ARM_PRIVATE_3"}, + {116, "R_ARM_PRIVATE_4"}, + {117, "R_ARM_PRIVATE_5"}, + {118, "R_ARM_PRIVATE_6"}, + {119, "R_ARM_PRIVATE_7"}, + {120, "R_ARM_PRIVATE_8"}, + {121, "R_ARM_PRIVATE_9"}, + {122, "R_ARM_PRIVATE_10"}, + {123, "R_ARM_PRIVATE_11"}, + {124, "R_ARM_PRIVATE_12"}, + {125, "R_ARM_PRIVATE_13"}, + {126, "R_ARM_PRIVATE_14"}, + {127, "R_ARM_PRIVATE_15"}, + {128, "R_ARM_ME_TOO"}, + {129, "R_ARM_THM_TLS_DESCSEQ16"}, + {130, "R_ARM_THM_TLS_DESCSEQ32"}, + {131, "R_ARM_THM_GOT_BREL12"}, + {132, "R_ARM_THM_ALU_ABS_G0_NC"}, + {133, "R_ARM_THM_ALU_ABS_G1_NC"}, + {134, "R_ARM_THM_ALU_ABS_G2_NC"}, + {135, "R_ARM_THM_ALU_ABS_G3"}, + {160, "R_ARM_IRELATIVE"}, + {249, "R_ARM_RXPC25"}, + {250, "R_ARM_RSBREL32"}, + {251, "R_ARM_THM_RPC22"}, + {252, "R_ARM_RREL32"}, + {253, "R_ARM_RABS32"}, + {254, "R_ARM_RPC24"}, + {255, "R_ARM_RBASE"}, +} + +func (i R_ARM) String() string { return stringName(uint32(i), rarmStrings, false) } +func (i R_ARM) GoString() string { return stringName(uint32(i), rarmStrings, true) } + +// Relocation types for 386. +type R_386 int + +const ( + R_386_NONE R_386 = 0 /* No relocation. */ + R_386_32 R_386 = 1 /* Add symbol value. */ + R_386_PC32 R_386 = 2 /* Add PC-relative symbol value. */ + R_386_GOT32 R_386 = 3 /* Add PC-relative GOT offset. */ + R_386_PLT32 R_386 = 4 /* Add PC-relative PLT offset. */ + R_386_COPY R_386 = 5 /* Copy data from shared object. */ + R_386_GLOB_DAT R_386 = 6 /* Set GOT entry to data address. */ + R_386_JMP_SLOT R_386 = 7 /* Set GOT entry to code address. */ + R_386_RELATIVE R_386 = 8 /* Add load address of shared object. */ + R_386_GOTOFF R_386 = 9 /* Add GOT-relative symbol address. */ + R_386_GOTPC R_386 = 10 /* Add PC-relative GOT table address. */ + R_386_32PLT R_386 = 11 + R_386_TLS_TPOFF R_386 = 14 /* Negative offset in static TLS block */ + R_386_TLS_IE R_386 = 15 /* Absolute address of GOT for -ve static TLS */ + R_386_TLS_GOTIE R_386 = 16 /* GOT entry for negative static TLS block */ + R_386_TLS_LE R_386 = 17 /* Negative offset relative to static TLS */ + R_386_TLS_GD R_386 = 18 /* 32 bit offset to GOT (index,off) pair */ + R_386_TLS_LDM R_386 = 19 /* 32 bit offset to GOT (index,zero) pair */ + R_386_16 R_386 = 20 + R_386_PC16 R_386 = 21 + R_386_8 R_386 = 22 + R_386_PC8 R_386 = 23 + R_386_TLS_GD_32 R_386 = 24 /* 32 bit offset to GOT (index,off) pair */ + R_386_TLS_GD_PUSH R_386 = 25 /* pushl instruction for Sun ABI GD sequence */ + R_386_TLS_GD_CALL R_386 = 26 /* call instruction for Sun ABI GD sequence */ + R_386_TLS_GD_POP R_386 = 27 /* popl instruction for Sun ABI GD sequence */ + R_386_TLS_LDM_32 R_386 = 28 /* 32 bit offset to GOT (index,zero) pair */ + R_386_TLS_LDM_PUSH R_386 = 29 /* pushl instruction for Sun ABI LD sequence */ + R_386_TLS_LDM_CALL R_386 = 30 /* call instruction for Sun ABI LD sequence */ + R_386_TLS_LDM_POP R_386 = 31 /* popl instruction for Sun ABI LD sequence */ + R_386_TLS_LDO_32 R_386 = 32 /* 32 bit offset from start of TLS block */ + R_386_TLS_IE_32 R_386 = 33 /* 32 bit offset to GOT static TLS offset entry */ + R_386_TLS_LE_32 R_386 = 34 /* 32 bit offset within static TLS block */ + R_386_TLS_DTPMOD32 R_386 = 35 /* GOT entry containing TLS index */ + R_386_TLS_DTPOFF32 R_386 = 36 /* GOT entry containing TLS offset */ + R_386_TLS_TPOFF32 R_386 = 37 /* GOT entry of -ve static TLS offset */ + R_386_SIZE32 R_386 = 38 + R_386_TLS_GOTDESC R_386 = 39 + R_386_TLS_DESC_CALL R_386 = 40 + R_386_TLS_DESC R_386 = 41 + R_386_IRELATIVE R_386 = 42 + R_386_GOT32X R_386 = 43 +) + +var r386Strings = []intName{ + {0, "R_386_NONE"}, + {1, "R_386_32"}, + {2, "R_386_PC32"}, + {3, "R_386_GOT32"}, + {4, "R_386_PLT32"}, + {5, "R_386_COPY"}, + {6, "R_386_GLOB_DAT"}, + {7, "R_386_JMP_SLOT"}, + {8, "R_386_RELATIVE"}, + {9, "R_386_GOTOFF"}, + {10, "R_386_GOTPC"}, + {11, "R_386_32PLT"}, + {14, "R_386_TLS_TPOFF"}, + {15, "R_386_TLS_IE"}, + {16, "R_386_TLS_GOTIE"}, + {17, "R_386_TLS_LE"}, + {18, "R_386_TLS_GD"}, + {19, "R_386_TLS_LDM"}, + {20, "R_386_16"}, + {21, "R_386_PC16"}, + {22, "R_386_8"}, + {23, "R_386_PC8"}, + {24, "R_386_TLS_GD_32"}, + {25, "R_386_TLS_GD_PUSH"}, + {26, "R_386_TLS_GD_CALL"}, + {27, "R_386_TLS_GD_POP"}, + {28, "R_386_TLS_LDM_32"}, + {29, "R_386_TLS_LDM_PUSH"}, + {30, "R_386_TLS_LDM_CALL"}, + {31, "R_386_TLS_LDM_POP"}, + {32, "R_386_TLS_LDO_32"}, + {33, "R_386_TLS_IE_32"}, + {34, "R_386_TLS_LE_32"}, + {35, "R_386_TLS_DTPMOD32"}, + {36, "R_386_TLS_DTPOFF32"}, + {37, "R_386_TLS_TPOFF32"}, + {38, "R_386_SIZE32"}, + {39, "R_386_TLS_GOTDESC"}, + {40, "R_386_TLS_DESC_CALL"}, + {41, "R_386_TLS_DESC"}, + {42, "R_386_IRELATIVE"}, + {43, "R_386_GOT32X"}, +} + +func (i R_386) String() string { return stringName(uint32(i), r386Strings, false) } +func (i R_386) GoString() string { return stringName(uint32(i), r386Strings, true) } + +// Relocation types for MIPS. +type R_MIPS int + +const ( + R_MIPS_NONE R_MIPS = 0 + R_MIPS_16 R_MIPS = 1 + R_MIPS_32 R_MIPS = 2 + R_MIPS_REL32 R_MIPS = 3 + R_MIPS_26 R_MIPS = 4 + R_MIPS_HI16 R_MIPS = 5 /* high 16 bits of symbol value */ + R_MIPS_LO16 R_MIPS = 6 /* low 16 bits of symbol value */ + R_MIPS_GPREL16 R_MIPS = 7 /* GP-relative reference */ + R_MIPS_LITERAL R_MIPS = 8 /* Reference to literal section */ + R_MIPS_GOT16 R_MIPS = 9 /* Reference to global offset table */ + R_MIPS_PC16 R_MIPS = 10 /* 16 bit PC relative reference */ + R_MIPS_CALL16 R_MIPS = 11 /* 16 bit call through glbl offset tbl */ + R_MIPS_GPREL32 R_MIPS = 12 + R_MIPS_SHIFT5 R_MIPS = 16 + R_MIPS_SHIFT6 R_MIPS = 17 + R_MIPS_64 R_MIPS = 18 + R_MIPS_GOT_DISP R_MIPS = 19 + R_MIPS_GOT_PAGE R_MIPS = 20 + R_MIPS_GOT_OFST R_MIPS = 21 + R_MIPS_GOT_HI16 R_MIPS = 22 + R_MIPS_GOT_LO16 R_MIPS = 23 + R_MIPS_SUB R_MIPS = 24 + R_MIPS_INSERT_A R_MIPS = 25 + R_MIPS_INSERT_B R_MIPS = 26 + R_MIPS_DELETE R_MIPS = 27 + R_MIPS_HIGHER R_MIPS = 28 + R_MIPS_HIGHEST R_MIPS = 29 + R_MIPS_CALL_HI16 R_MIPS = 30 + R_MIPS_CALL_LO16 R_MIPS = 31 + R_MIPS_SCN_DISP R_MIPS = 32 + R_MIPS_REL16 R_MIPS = 33 + R_MIPS_ADD_IMMEDIATE R_MIPS = 34 + R_MIPS_PJUMP R_MIPS = 35 + R_MIPS_RELGOT R_MIPS = 36 + R_MIPS_JALR R_MIPS = 37 + + R_MIPS_TLS_DTPMOD32 R_MIPS = 38 /* Module number 32 bit */ + R_MIPS_TLS_DTPREL32 R_MIPS = 39 /* Module-relative offset 32 bit */ + R_MIPS_TLS_DTPMOD64 R_MIPS = 40 /* Module number 64 bit */ + R_MIPS_TLS_DTPREL64 R_MIPS = 41 /* Module-relative offset 64 bit */ + R_MIPS_TLS_GD R_MIPS = 42 /* 16 bit GOT offset for GD */ + R_MIPS_TLS_LDM R_MIPS = 43 /* 16 bit GOT offset for LDM */ + R_MIPS_TLS_DTPREL_HI16 R_MIPS = 44 /* Module-relative offset, high 16 bits */ + R_MIPS_TLS_DTPREL_LO16 R_MIPS = 45 /* Module-relative offset, low 16 bits */ + R_MIPS_TLS_GOTTPREL R_MIPS = 46 /* 16 bit GOT offset for IE */ + R_MIPS_TLS_TPREL32 R_MIPS = 47 /* TP-relative offset, 32 bit */ + R_MIPS_TLS_TPREL64 R_MIPS = 48 /* TP-relative offset, 64 bit */ + R_MIPS_TLS_TPREL_HI16 R_MIPS = 49 /* TP-relative offset, high 16 bits */ + R_MIPS_TLS_TPREL_LO16 R_MIPS = 50 /* TP-relative offset, low 16 bits */ +) + +var rmipsStrings = []intName{ + {0, "R_MIPS_NONE"}, + {1, "R_MIPS_16"}, + {2, "R_MIPS_32"}, + {3, "R_MIPS_REL32"}, + {4, "R_MIPS_26"}, + {5, "R_MIPS_HI16"}, + {6, "R_MIPS_LO16"}, + {7, "R_MIPS_GPREL16"}, + {8, "R_MIPS_LITERAL"}, + {9, "R_MIPS_GOT16"}, + {10, "R_MIPS_PC16"}, + {11, "R_MIPS_CALL16"}, + {12, "R_MIPS_GPREL32"}, + {16, "R_MIPS_SHIFT5"}, + {17, "R_MIPS_SHIFT6"}, + {18, "R_MIPS_64"}, + {19, "R_MIPS_GOT_DISP"}, + {20, "R_MIPS_GOT_PAGE"}, + {21, "R_MIPS_GOT_OFST"}, + {22, "R_MIPS_GOT_HI16"}, + {23, "R_MIPS_GOT_LO16"}, + {24, "R_MIPS_SUB"}, + {25, "R_MIPS_INSERT_A"}, + {26, "R_MIPS_INSERT_B"}, + {27, "R_MIPS_DELETE"}, + {28, "R_MIPS_HIGHER"}, + {29, "R_MIPS_HIGHEST"}, + {30, "R_MIPS_CALL_HI16"}, + {31, "R_MIPS_CALL_LO16"}, + {32, "R_MIPS_SCN_DISP"}, + {33, "R_MIPS_REL16"}, + {34, "R_MIPS_ADD_IMMEDIATE"}, + {35, "R_MIPS_PJUMP"}, + {36, "R_MIPS_RELGOT"}, + {37, "R_MIPS_JALR"}, + {38, "R_MIPS_TLS_DTPMOD32"}, + {39, "R_MIPS_TLS_DTPREL32"}, + {40, "R_MIPS_TLS_DTPMOD64"}, + {41, "R_MIPS_TLS_DTPREL64"}, + {42, "R_MIPS_TLS_GD"}, + {43, "R_MIPS_TLS_LDM"}, + {44, "R_MIPS_TLS_DTPREL_HI16"}, + {45, "R_MIPS_TLS_DTPREL_LO16"}, + {46, "R_MIPS_TLS_GOTTPREL"}, + {47, "R_MIPS_TLS_TPREL32"}, + {48, "R_MIPS_TLS_TPREL64"}, + {49, "R_MIPS_TLS_TPREL_HI16"}, + {50, "R_MIPS_TLS_TPREL_LO16"}, +} + +func (i R_MIPS) String() string { return stringName(uint32(i), rmipsStrings, false) } +func (i R_MIPS) GoString() string { return stringName(uint32(i), rmipsStrings, true) } + +// Relocation types for LoongArch. +type R_LARCH int + +const ( + R_LARCH_NONE R_LARCH = 0 + R_LARCH_32 R_LARCH = 1 + R_LARCH_64 R_LARCH = 2 + R_LARCH_RELATIVE R_LARCH = 3 + R_LARCH_COPY R_LARCH = 4 + R_LARCH_JUMP_SLOT R_LARCH = 5 + R_LARCH_TLS_DTPMOD32 R_LARCH = 6 + R_LARCH_TLS_DTPMOD64 R_LARCH = 7 + R_LARCH_TLS_DTPREL32 R_LARCH = 8 + R_LARCH_TLS_DTPREL64 R_LARCH = 9 + R_LARCH_TLS_TPREL32 R_LARCH = 10 + R_LARCH_TLS_TPREL64 R_LARCH = 11 + R_LARCH_IRELATIVE R_LARCH = 12 + R_LARCH_MARK_LA R_LARCH = 20 + R_LARCH_MARK_PCREL R_LARCH = 21 + R_LARCH_SOP_PUSH_PCREL R_LARCH = 22 + R_LARCH_SOP_PUSH_ABSOLUTE R_LARCH = 23 + R_LARCH_SOP_PUSH_DUP R_LARCH = 24 + R_LARCH_SOP_PUSH_GPREL R_LARCH = 25 + R_LARCH_SOP_PUSH_TLS_TPREL R_LARCH = 26 + R_LARCH_SOP_PUSH_TLS_GOT R_LARCH = 27 + R_LARCH_SOP_PUSH_TLS_GD R_LARCH = 28 + R_LARCH_SOP_PUSH_PLT_PCREL R_LARCH = 29 + R_LARCH_SOP_ASSERT R_LARCH = 30 + R_LARCH_SOP_NOT R_LARCH = 31 + R_LARCH_SOP_SUB R_LARCH = 32 + R_LARCH_SOP_SL R_LARCH = 33 + R_LARCH_SOP_SR R_LARCH = 34 + R_LARCH_SOP_ADD R_LARCH = 35 + R_LARCH_SOP_AND R_LARCH = 36 + R_LARCH_SOP_IF_ELSE R_LARCH = 37 + R_LARCH_SOP_POP_32_S_10_5 R_LARCH = 38 + R_LARCH_SOP_POP_32_U_10_12 R_LARCH = 39 + R_LARCH_SOP_POP_32_S_10_12 R_LARCH = 40 + R_LARCH_SOP_POP_32_S_10_16 R_LARCH = 41 + R_LARCH_SOP_POP_32_S_10_16_S2 R_LARCH = 42 + R_LARCH_SOP_POP_32_S_5_20 R_LARCH = 43 + R_LARCH_SOP_POP_32_S_0_5_10_16_S2 R_LARCH = 44 + R_LARCH_SOP_POP_32_S_0_10_10_16_S2 R_LARCH = 45 + R_LARCH_SOP_POP_32_U R_LARCH = 46 + R_LARCH_ADD8 R_LARCH = 47 + R_LARCH_ADD16 R_LARCH = 48 + R_LARCH_ADD24 R_LARCH = 49 + R_LARCH_ADD32 R_LARCH = 50 + R_LARCH_ADD64 R_LARCH = 51 + R_LARCH_SUB8 R_LARCH = 52 + R_LARCH_SUB16 R_LARCH = 53 + R_LARCH_SUB24 R_LARCH = 54 + R_LARCH_SUB32 R_LARCH = 55 + R_LARCH_SUB64 R_LARCH = 56 + R_LARCH_GNU_VTINHERIT R_LARCH = 57 + R_LARCH_GNU_VTENTRY R_LARCH = 58 + R_LARCH_B16 R_LARCH = 64 + R_LARCH_B21 R_LARCH = 65 + R_LARCH_B26 R_LARCH = 66 + R_LARCH_ABS_HI20 R_LARCH = 67 + R_LARCH_ABS_LO12 R_LARCH = 68 + R_LARCH_ABS64_LO20 R_LARCH = 69 + R_LARCH_ABS64_HI12 R_LARCH = 70 + R_LARCH_PCALA_HI20 R_LARCH = 71 + R_LARCH_PCALA_LO12 R_LARCH = 72 + R_LARCH_PCALA64_LO20 R_LARCH = 73 + R_LARCH_PCALA64_HI12 R_LARCH = 74 + R_LARCH_GOT_PC_HI20 R_LARCH = 75 + R_LARCH_GOT_PC_LO12 R_LARCH = 76 + R_LARCH_GOT64_PC_LO20 R_LARCH = 77 + R_LARCH_GOT64_PC_HI12 R_LARCH = 78 + R_LARCH_GOT_HI20 R_LARCH = 79 + R_LARCH_GOT_LO12 R_LARCH = 80 + R_LARCH_GOT64_LO20 R_LARCH = 81 + R_LARCH_GOT64_HI12 R_LARCH = 82 + R_LARCH_TLS_LE_HI20 R_LARCH = 83 + R_LARCH_TLS_LE_LO12 R_LARCH = 84 + R_LARCH_TLS_LE64_LO20 R_LARCH = 85 + R_LARCH_TLS_LE64_HI12 R_LARCH = 86 + R_LARCH_TLS_IE_PC_HI20 R_LARCH = 87 + R_LARCH_TLS_IE_PC_LO12 R_LARCH = 88 + R_LARCH_TLS_IE64_PC_LO20 R_LARCH = 89 + R_LARCH_TLS_IE64_PC_HI12 R_LARCH = 90 + R_LARCH_TLS_IE_HI20 R_LARCH = 91 + R_LARCH_TLS_IE_LO12 R_LARCH = 92 + R_LARCH_TLS_IE64_LO20 R_LARCH = 93 + R_LARCH_TLS_IE64_HI12 R_LARCH = 94 + R_LARCH_TLS_LD_PC_HI20 R_LARCH = 95 + R_LARCH_TLS_LD_HI20 R_LARCH = 96 + R_LARCH_TLS_GD_PC_HI20 R_LARCH = 97 + R_LARCH_TLS_GD_HI20 R_LARCH = 98 + R_LARCH_32_PCREL R_LARCH = 99 + R_LARCH_RELAX R_LARCH = 100 +) + +var rlarchStrings = []intName{ + {0, "R_LARCH_NONE"}, + {1, "R_LARCH_32"}, + {2, "R_LARCH_64"}, + {3, "R_LARCH_RELATIVE"}, + {4, "R_LARCH_COPY"}, + {5, "R_LARCH_JUMP_SLOT"}, + {6, "R_LARCH_TLS_DTPMOD32"}, + {7, "R_LARCH_TLS_DTPMOD64"}, + {8, "R_LARCH_TLS_DTPREL32"}, + {9, "R_LARCH_TLS_DTPREL64"}, + {10, "R_LARCH_TLS_TPREL32"}, + {11, "R_LARCH_TLS_TPREL64"}, + {12, "R_LARCH_IRELATIVE"}, + {20, "R_LARCH_MARK_LA"}, + {21, "R_LARCH_MARK_PCREL"}, + {22, "R_LARCH_SOP_PUSH_PCREL"}, + {23, "R_LARCH_SOP_PUSH_ABSOLUTE"}, + {24, "R_LARCH_SOP_PUSH_DUP"}, + {25, "R_LARCH_SOP_PUSH_GPREL"}, + {26, "R_LARCH_SOP_PUSH_TLS_TPREL"}, + {27, "R_LARCH_SOP_PUSH_TLS_GOT"}, + {28, "R_LARCH_SOP_PUSH_TLS_GD"}, + {29, "R_LARCH_SOP_PUSH_PLT_PCREL"}, + {30, "R_LARCH_SOP_ASSERT"}, + {31, "R_LARCH_SOP_NOT"}, + {32, "R_LARCH_SOP_SUB"}, + {33, "R_LARCH_SOP_SL"}, + {34, "R_LARCH_SOP_SR"}, + {35, "R_LARCH_SOP_ADD"}, + {36, "R_LARCH_SOP_AND"}, + {37, "R_LARCH_SOP_IF_ELSE"}, + {38, "R_LARCH_SOP_POP_32_S_10_5"}, + {39, "R_LARCH_SOP_POP_32_U_10_12"}, + {40, "R_LARCH_SOP_POP_32_S_10_12"}, + {41, "R_LARCH_SOP_POP_32_S_10_16"}, + {42, "R_LARCH_SOP_POP_32_S_10_16_S2"}, + {43, "R_LARCH_SOP_POP_32_S_5_20"}, + {44, "R_LARCH_SOP_POP_32_S_0_5_10_16_S2"}, + {45, "R_LARCH_SOP_POP_32_S_0_10_10_16_S2"}, + {46, "R_LARCH_SOP_POP_32_U"}, + {47, "R_LARCH_ADD8"}, + {48, "R_LARCH_ADD16"}, + {49, "R_LARCH_ADD24"}, + {50, "R_LARCH_ADD32"}, + {51, "R_LARCH_ADD64"}, + {52, "R_LARCH_SUB8"}, + {53, "R_LARCH_SUB16"}, + {54, "R_LARCH_SUB24"}, + {55, "R_LARCH_SUB32"}, + {56, "R_LARCH_SUB64"}, + {57, "R_LARCH_GNU_VTINHERIT"}, + {58, "R_LARCH_GNU_VTENTRY"}, + {64, "R_LARCH_B16"}, + {65, "R_LARCH_B21"}, + {66, "R_LARCH_B26"}, + {67, "R_LARCH_ABS_HI20"}, + {68, "R_LARCH_ABS_LO12"}, + {69, "R_LARCH_ABS64_LO20"}, + {70, "R_LARCH_ABS64_HI12"}, + {71, "R_LARCH_PCALA_HI20"}, + {72, "R_LARCH_PCALA_LO12"}, + {73, "R_LARCH_PCALA64_LO20"}, + {74, "R_LARCH_PCALA64_HI12"}, + {75, "R_LARCH_GOT_PC_HI20"}, + {76, "R_LARCH_GOT_PC_LO12"}, + {77, "R_LARCH_GOT64_PC_LO20"}, + {78, "R_LARCH_GOT64_PC_HI12"}, + {79, "R_LARCH_GOT_HI20"}, + {80, "R_LARCH_GOT_LO12"}, + {81, "R_LARCH_GOT64_LO20"}, + {82, "R_LARCH_GOT64_HI12"}, + {83, "R_LARCH_TLS_LE_HI20"}, + {84, "R_LARCH_TLS_LE_LO12"}, + {85, "R_LARCH_TLS_LE64_LO20"}, + {86, "R_LARCH_TLS_LE64_HI12"}, + {87, "R_LARCH_TLS_IE_PC_HI20"}, + {88, "R_LARCH_TLS_IE_PC_LO12"}, + {89, "R_LARCH_TLS_IE64_PC_LO20"}, + {90, "R_LARCH_TLS_IE64_PC_HI12"}, + {91, "R_LARCH_TLS_IE_HI20"}, + {92, "R_LARCH_TLS_IE_LO12"}, + {93, "R_LARCH_TLS_IE64_LO20"}, + {94, "R_LARCH_TLS_IE64_HI12"}, + {95, "R_LARCH_TLS_LD_PC_HI20"}, + {96, "R_LARCH_TLS_LD_HI20"}, + {97, "R_LARCH_TLS_GD_PC_HI20"}, + {98, "R_LARCH_TLS_GD_HI20"}, + {99, "R_LARCH_32_PCREL"}, + {100, "R_LARCH_RELAX"}, +} + +func (i R_LARCH) String() string { return stringName(uint32(i), rlarchStrings, false) } +func (i R_LARCH) GoString() string { return stringName(uint32(i), rlarchStrings, true) } + +// Relocation types for PowerPC. +// +// Values that are shared by both R_PPC and R_PPC64 are prefixed with +// R_POWERPC_ in the ELF standard. For the R_PPC type, the relevant +// shared relocations have been renamed with the prefix R_PPC_. +// The original name follows the value in a comment. +type R_PPC int + +const ( + R_PPC_NONE R_PPC = 0 // R_POWERPC_NONE + R_PPC_ADDR32 R_PPC = 1 // R_POWERPC_ADDR32 + R_PPC_ADDR24 R_PPC = 2 // R_POWERPC_ADDR24 + R_PPC_ADDR16 R_PPC = 3 // R_POWERPC_ADDR16 + R_PPC_ADDR16_LO R_PPC = 4 // R_POWERPC_ADDR16_LO + R_PPC_ADDR16_HI R_PPC = 5 // R_POWERPC_ADDR16_HI + R_PPC_ADDR16_HA R_PPC = 6 // R_POWERPC_ADDR16_HA + R_PPC_ADDR14 R_PPC = 7 // R_POWERPC_ADDR14 + R_PPC_ADDR14_BRTAKEN R_PPC = 8 // R_POWERPC_ADDR14_BRTAKEN + R_PPC_ADDR14_BRNTAKEN R_PPC = 9 // R_POWERPC_ADDR14_BRNTAKEN + R_PPC_REL24 R_PPC = 10 // R_POWERPC_REL24 + R_PPC_REL14 R_PPC = 11 // R_POWERPC_REL14 + R_PPC_REL14_BRTAKEN R_PPC = 12 // R_POWERPC_REL14_BRTAKEN + R_PPC_REL14_BRNTAKEN R_PPC = 13 // R_POWERPC_REL14_BRNTAKEN + R_PPC_GOT16 R_PPC = 14 // R_POWERPC_GOT16 + R_PPC_GOT16_LO R_PPC = 15 // R_POWERPC_GOT16_LO + R_PPC_GOT16_HI R_PPC = 16 // R_POWERPC_GOT16_HI + R_PPC_GOT16_HA R_PPC = 17 // R_POWERPC_GOT16_HA + R_PPC_PLTREL24 R_PPC = 18 + R_PPC_COPY R_PPC = 19 // R_POWERPC_COPY + R_PPC_GLOB_DAT R_PPC = 20 // R_POWERPC_GLOB_DAT + R_PPC_JMP_SLOT R_PPC = 21 // R_POWERPC_JMP_SLOT + R_PPC_RELATIVE R_PPC = 22 // R_POWERPC_RELATIVE + R_PPC_LOCAL24PC R_PPC = 23 + R_PPC_UADDR32 R_PPC = 24 // R_POWERPC_UADDR32 + R_PPC_UADDR16 R_PPC = 25 // R_POWERPC_UADDR16 + R_PPC_REL32 R_PPC = 26 // R_POWERPC_REL32 + R_PPC_PLT32 R_PPC = 27 // R_POWERPC_PLT32 + R_PPC_PLTREL32 R_PPC = 28 // R_POWERPC_PLTREL32 + R_PPC_PLT16_LO R_PPC = 29 // R_POWERPC_PLT16_LO + R_PPC_PLT16_HI R_PPC = 30 // R_POWERPC_PLT16_HI + R_PPC_PLT16_HA R_PPC = 31 // R_POWERPC_PLT16_HA + R_PPC_SDAREL16 R_PPC = 32 + R_PPC_SECTOFF R_PPC = 33 // R_POWERPC_SECTOFF + R_PPC_SECTOFF_LO R_PPC = 34 // R_POWERPC_SECTOFF_LO + R_PPC_SECTOFF_HI R_PPC = 35 // R_POWERPC_SECTOFF_HI + R_PPC_SECTOFF_HA R_PPC = 36 // R_POWERPC_SECTOFF_HA + R_PPC_TLS R_PPC = 67 // R_POWERPC_TLS + R_PPC_DTPMOD32 R_PPC = 68 // R_POWERPC_DTPMOD32 + R_PPC_TPREL16 R_PPC = 69 // R_POWERPC_TPREL16 + R_PPC_TPREL16_LO R_PPC = 70 // R_POWERPC_TPREL16_LO + R_PPC_TPREL16_HI R_PPC = 71 // R_POWERPC_TPREL16_HI + R_PPC_TPREL16_HA R_PPC = 72 // R_POWERPC_TPREL16_HA + R_PPC_TPREL32 R_PPC = 73 // R_POWERPC_TPREL32 + R_PPC_DTPREL16 R_PPC = 74 // R_POWERPC_DTPREL16 + R_PPC_DTPREL16_LO R_PPC = 75 // R_POWERPC_DTPREL16_LO + R_PPC_DTPREL16_HI R_PPC = 76 // R_POWERPC_DTPREL16_HI + R_PPC_DTPREL16_HA R_PPC = 77 // R_POWERPC_DTPREL16_HA + R_PPC_DTPREL32 R_PPC = 78 // R_POWERPC_DTPREL32 + R_PPC_GOT_TLSGD16 R_PPC = 79 // R_POWERPC_GOT_TLSGD16 + R_PPC_GOT_TLSGD16_LO R_PPC = 80 // R_POWERPC_GOT_TLSGD16_LO + R_PPC_GOT_TLSGD16_HI R_PPC = 81 // R_POWERPC_GOT_TLSGD16_HI + R_PPC_GOT_TLSGD16_HA R_PPC = 82 // R_POWERPC_GOT_TLSGD16_HA + R_PPC_GOT_TLSLD16 R_PPC = 83 // R_POWERPC_GOT_TLSLD16 + R_PPC_GOT_TLSLD16_LO R_PPC = 84 // R_POWERPC_GOT_TLSLD16_LO + R_PPC_GOT_TLSLD16_HI R_PPC = 85 // R_POWERPC_GOT_TLSLD16_HI + R_PPC_GOT_TLSLD16_HA R_PPC = 86 // R_POWERPC_GOT_TLSLD16_HA + R_PPC_GOT_TPREL16 R_PPC = 87 // R_POWERPC_GOT_TPREL16 + R_PPC_GOT_TPREL16_LO R_PPC = 88 // R_POWERPC_GOT_TPREL16_LO + R_PPC_GOT_TPREL16_HI R_PPC = 89 // R_POWERPC_GOT_TPREL16_HI + R_PPC_GOT_TPREL16_HA R_PPC = 90 // R_POWERPC_GOT_TPREL16_HA + R_PPC_EMB_NADDR32 R_PPC = 101 + R_PPC_EMB_NADDR16 R_PPC = 102 + R_PPC_EMB_NADDR16_LO R_PPC = 103 + R_PPC_EMB_NADDR16_HI R_PPC = 104 + R_PPC_EMB_NADDR16_HA R_PPC = 105 + R_PPC_EMB_SDAI16 R_PPC = 106 + R_PPC_EMB_SDA2I16 R_PPC = 107 + R_PPC_EMB_SDA2REL R_PPC = 108 + R_PPC_EMB_SDA21 R_PPC = 109 + R_PPC_EMB_MRKREF R_PPC = 110 + R_PPC_EMB_RELSEC16 R_PPC = 111 + R_PPC_EMB_RELST_LO R_PPC = 112 + R_PPC_EMB_RELST_HI R_PPC = 113 + R_PPC_EMB_RELST_HA R_PPC = 114 + R_PPC_EMB_BIT_FLD R_PPC = 115 + R_PPC_EMB_RELSDA R_PPC = 116 +) + +var rppcStrings = []intName{ + {0, "R_PPC_NONE"}, + {1, "R_PPC_ADDR32"}, + {2, "R_PPC_ADDR24"}, + {3, "R_PPC_ADDR16"}, + {4, "R_PPC_ADDR16_LO"}, + {5, "R_PPC_ADDR16_HI"}, + {6, "R_PPC_ADDR16_HA"}, + {7, "R_PPC_ADDR14"}, + {8, "R_PPC_ADDR14_BRTAKEN"}, + {9, "R_PPC_ADDR14_BRNTAKEN"}, + {10, "R_PPC_REL24"}, + {11, "R_PPC_REL14"}, + {12, "R_PPC_REL14_BRTAKEN"}, + {13, "R_PPC_REL14_BRNTAKEN"}, + {14, "R_PPC_GOT16"}, + {15, "R_PPC_GOT16_LO"}, + {16, "R_PPC_GOT16_HI"}, + {17, "R_PPC_GOT16_HA"}, + {18, "R_PPC_PLTREL24"}, + {19, "R_PPC_COPY"}, + {20, "R_PPC_GLOB_DAT"}, + {21, "R_PPC_JMP_SLOT"}, + {22, "R_PPC_RELATIVE"}, + {23, "R_PPC_LOCAL24PC"}, + {24, "R_PPC_UADDR32"}, + {25, "R_PPC_UADDR16"}, + {26, "R_PPC_REL32"}, + {27, "R_PPC_PLT32"}, + {28, "R_PPC_PLTREL32"}, + {29, "R_PPC_PLT16_LO"}, + {30, "R_PPC_PLT16_HI"}, + {31, "R_PPC_PLT16_HA"}, + {32, "R_PPC_SDAREL16"}, + {33, "R_PPC_SECTOFF"}, + {34, "R_PPC_SECTOFF_LO"}, + {35, "R_PPC_SECTOFF_HI"}, + {36, "R_PPC_SECTOFF_HA"}, + {67, "R_PPC_TLS"}, + {68, "R_PPC_DTPMOD32"}, + {69, "R_PPC_TPREL16"}, + {70, "R_PPC_TPREL16_LO"}, + {71, "R_PPC_TPREL16_HI"}, + {72, "R_PPC_TPREL16_HA"}, + {73, "R_PPC_TPREL32"}, + {74, "R_PPC_DTPREL16"}, + {75, "R_PPC_DTPREL16_LO"}, + {76, "R_PPC_DTPREL16_HI"}, + {77, "R_PPC_DTPREL16_HA"}, + {78, "R_PPC_DTPREL32"}, + {79, "R_PPC_GOT_TLSGD16"}, + {80, "R_PPC_GOT_TLSGD16_LO"}, + {81, "R_PPC_GOT_TLSGD16_HI"}, + {82, "R_PPC_GOT_TLSGD16_HA"}, + {83, "R_PPC_GOT_TLSLD16"}, + {84, "R_PPC_GOT_TLSLD16_LO"}, + {85, "R_PPC_GOT_TLSLD16_HI"}, + {86, "R_PPC_GOT_TLSLD16_HA"}, + {87, "R_PPC_GOT_TPREL16"}, + {88, "R_PPC_GOT_TPREL16_LO"}, + {89, "R_PPC_GOT_TPREL16_HI"}, + {90, "R_PPC_GOT_TPREL16_HA"}, + {101, "R_PPC_EMB_NADDR32"}, + {102, "R_PPC_EMB_NADDR16"}, + {103, "R_PPC_EMB_NADDR16_LO"}, + {104, "R_PPC_EMB_NADDR16_HI"}, + {105, "R_PPC_EMB_NADDR16_HA"}, + {106, "R_PPC_EMB_SDAI16"}, + {107, "R_PPC_EMB_SDA2I16"}, + {108, "R_PPC_EMB_SDA2REL"}, + {109, "R_PPC_EMB_SDA21"}, + {110, "R_PPC_EMB_MRKREF"}, + {111, "R_PPC_EMB_RELSEC16"}, + {112, "R_PPC_EMB_RELST_LO"}, + {113, "R_PPC_EMB_RELST_HI"}, + {114, "R_PPC_EMB_RELST_HA"}, + {115, "R_PPC_EMB_BIT_FLD"}, + {116, "R_PPC_EMB_RELSDA"}, +} + +func (i R_PPC) String() string { return stringName(uint32(i), rppcStrings, false) } +func (i R_PPC) GoString() string { return stringName(uint32(i), rppcStrings, true) } + +// Relocation types for 64-bit PowerPC or Power Architecture processors. +// +// Values that are shared by both R_PPC and R_PPC64 are prefixed with +// R_POWERPC_ in the ELF standard. For the R_PPC64 type, the relevant +// shared relocations have been renamed with the prefix R_PPC64_. +// The original name follows the value in a comment. +type R_PPC64 int + +const ( + R_PPC64_NONE R_PPC64 = 0 // R_POWERPC_NONE + R_PPC64_ADDR32 R_PPC64 = 1 // R_POWERPC_ADDR32 + R_PPC64_ADDR24 R_PPC64 = 2 // R_POWERPC_ADDR24 + R_PPC64_ADDR16 R_PPC64 = 3 // R_POWERPC_ADDR16 + R_PPC64_ADDR16_LO R_PPC64 = 4 // R_POWERPC_ADDR16_LO + R_PPC64_ADDR16_HI R_PPC64 = 5 // R_POWERPC_ADDR16_HI + R_PPC64_ADDR16_HA R_PPC64 = 6 // R_POWERPC_ADDR16_HA + R_PPC64_ADDR14 R_PPC64 = 7 // R_POWERPC_ADDR14 + R_PPC64_ADDR14_BRTAKEN R_PPC64 = 8 // R_POWERPC_ADDR14_BRTAKEN + R_PPC64_ADDR14_BRNTAKEN R_PPC64 = 9 // R_POWERPC_ADDR14_BRNTAKEN + R_PPC64_REL24 R_PPC64 = 10 // R_POWERPC_REL24 + R_PPC64_REL14 R_PPC64 = 11 // R_POWERPC_REL14 + R_PPC64_REL14_BRTAKEN R_PPC64 = 12 // R_POWERPC_REL14_BRTAKEN + R_PPC64_REL14_BRNTAKEN R_PPC64 = 13 // R_POWERPC_REL14_BRNTAKEN + R_PPC64_GOT16 R_PPC64 = 14 // R_POWERPC_GOT16 + R_PPC64_GOT16_LO R_PPC64 = 15 // R_POWERPC_GOT16_LO + R_PPC64_GOT16_HI R_PPC64 = 16 // R_POWERPC_GOT16_HI + R_PPC64_GOT16_HA R_PPC64 = 17 // R_POWERPC_GOT16_HA + R_PPC64_COPY R_PPC64 = 19 // R_POWERPC_COPY + R_PPC64_GLOB_DAT R_PPC64 = 20 // R_POWERPC_GLOB_DAT + R_PPC64_JMP_SLOT R_PPC64 = 21 // R_POWERPC_JMP_SLOT + R_PPC64_RELATIVE R_PPC64 = 22 // R_POWERPC_RELATIVE + R_PPC64_UADDR32 R_PPC64 = 24 // R_POWERPC_UADDR32 + R_PPC64_UADDR16 R_PPC64 = 25 // R_POWERPC_UADDR16 + R_PPC64_REL32 R_PPC64 = 26 // R_POWERPC_REL32 + R_PPC64_PLT32 R_PPC64 = 27 // R_POWERPC_PLT32 + R_PPC64_PLTREL32 R_PPC64 = 28 // R_POWERPC_PLTREL32 + R_PPC64_PLT16_LO R_PPC64 = 29 // R_POWERPC_PLT16_LO + R_PPC64_PLT16_HI R_PPC64 = 30 // R_POWERPC_PLT16_HI + R_PPC64_PLT16_HA R_PPC64 = 31 // R_POWERPC_PLT16_HA + R_PPC64_SECTOFF R_PPC64 = 33 // R_POWERPC_SECTOFF + R_PPC64_SECTOFF_LO R_PPC64 = 34 // R_POWERPC_SECTOFF_LO + R_PPC64_SECTOFF_HI R_PPC64 = 35 // R_POWERPC_SECTOFF_HI + R_PPC64_SECTOFF_HA R_PPC64 = 36 // R_POWERPC_SECTOFF_HA + R_PPC64_REL30 R_PPC64 = 37 // R_POWERPC_ADDR30 + R_PPC64_ADDR64 R_PPC64 = 38 + R_PPC64_ADDR16_HIGHER R_PPC64 = 39 + R_PPC64_ADDR16_HIGHERA R_PPC64 = 40 + R_PPC64_ADDR16_HIGHEST R_PPC64 = 41 + R_PPC64_ADDR16_HIGHESTA R_PPC64 = 42 + R_PPC64_UADDR64 R_PPC64 = 43 + R_PPC64_REL64 R_PPC64 = 44 + R_PPC64_PLT64 R_PPC64 = 45 + R_PPC64_PLTREL64 R_PPC64 = 46 + R_PPC64_TOC16 R_PPC64 = 47 + R_PPC64_TOC16_LO R_PPC64 = 48 + R_PPC64_TOC16_HI R_PPC64 = 49 + R_PPC64_TOC16_HA R_PPC64 = 50 + R_PPC64_TOC R_PPC64 = 51 + R_PPC64_PLTGOT16 R_PPC64 = 52 + R_PPC64_PLTGOT16_LO R_PPC64 = 53 + R_PPC64_PLTGOT16_HI R_PPC64 = 54 + R_PPC64_PLTGOT16_HA R_PPC64 = 55 + R_PPC64_ADDR16_DS R_PPC64 = 56 + R_PPC64_ADDR16_LO_DS R_PPC64 = 57 + R_PPC64_GOT16_DS R_PPC64 = 58 + R_PPC64_GOT16_LO_DS R_PPC64 = 59 + R_PPC64_PLT16_LO_DS R_PPC64 = 60 + R_PPC64_SECTOFF_DS R_PPC64 = 61 + R_PPC64_SECTOFF_LO_DS R_PPC64 = 62 + R_PPC64_TOC16_DS R_PPC64 = 63 + R_PPC64_TOC16_LO_DS R_PPC64 = 64 + R_PPC64_PLTGOT16_DS R_PPC64 = 65 + R_PPC64_PLTGOT_LO_DS R_PPC64 = 66 + R_PPC64_TLS R_PPC64 = 67 // R_POWERPC_TLS + R_PPC64_DTPMOD64 R_PPC64 = 68 // R_POWERPC_DTPMOD64 + R_PPC64_TPREL16 R_PPC64 = 69 // R_POWERPC_TPREL16 + R_PPC64_TPREL16_LO R_PPC64 = 70 // R_POWERPC_TPREL16_LO + R_PPC64_TPREL16_HI R_PPC64 = 71 // R_POWERPC_TPREL16_HI + R_PPC64_TPREL16_HA R_PPC64 = 72 // R_POWERPC_TPREL16_HA + R_PPC64_TPREL64 R_PPC64 = 73 // R_POWERPC_TPREL64 + R_PPC64_DTPREL16 R_PPC64 = 74 // R_POWERPC_DTPREL16 + R_PPC64_DTPREL16_LO R_PPC64 = 75 // R_POWERPC_DTPREL16_LO + R_PPC64_DTPREL16_HI R_PPC64 = 76 // R_POWERPC_DTPREL16_HI + R_PPC64_DTPREL16_HA R_PPC64 = 77 // R_POWERPC_DTPREL16_HA + R_PPC64_DTPREL64 R_PPC64 = 78 // R_POWERPC_DTPREL64 + R_PPC64_GOT_TLSGD16 R_PPC64 = 79 // R_POWERPC_GOT_TLSGD16 + R_PPC64_GOT_TLSGD16_LO R_PPC64 = 80 // R_POWERPC_GOT_TLSGD16_LO + R_PPC64_GOT_TLSGD16_HI R_PPC64 = 81 // R_POWERPC_GOT_TLSGD16_HI + R_PPC64_GOT_TLSGD16_HA R_PPC64 = 82 // R_POWERPC_GOT_TLSGD16_HA + R_PPC64_GOT_TLSLD16 R_PPC64 = 83 // R_POWERPC_GOT_TLSLD16 + R_PPC64_GOT_TLSLD16_LO R_PPC64 = 84 // R_POWERPC_GOT_TLSLD16_LO + R_PPC64_GOT_TLSLD16_HI R_PPC64 = 85 // R_POWERPC_GOT_TLSLD16_HI + R_PPC64_GOT_TLSLD16_HA R_PPC64 = 86 // R_POWERPC_GOT_TLSLD16_HA + R_PPC64_GOT_TPREL16_DS R_PPC64 = 87 // R_POWERPC_GOT_TPREL16_DS + R_PPC64_GOT_TPREL16_LO_DS R_PPC64 = 88 // R_POWERPC_GOT_TPREL16_LO_DS + R_PPC64_GOT_TPREL16_HI R_PPC64 = 89 // R_POWERPC_GOT_TPREL16_HI + R_PPC64_GOT_TPREL16_HA R_PPC64 = 90 // R_POWERPC_GOT_TPREL16_HA + R_PPC64_GOT_DTPREL16_DS R_PPC64 = 91 // R_POWERPC_GOT_DTPREL16_DS + R_PPC64_GOT_DTPREL16_LO_DS R_PPC64 = 92 // R_POWERPC_GOT_DTPREL16_LO_DS + R_PPC64_GOT_DTPREL16_HI R_PPC64 = 93 // R_POWERPC_GOT_DTPREL16_HI + R_PPC64_GOT_DTPREL16_HA R_PPC64 = 94 // R_POWERPC_GOT_DTPREL16_HA + R_PPC64_TPREL16_DS R_PPC64 = 95 + R_PPC64_TPREL16_LO_DS R_PPC64 = 96 + R_PPC64_TPREL16_HIGHER R_PPC64 = 97 + R_PPC64_TPREL16_HIGHERA R_PPC64 = 98 + R_PPC64_TPREL16_HIGHEST R_PPC64 = 99 + R_PPC64_TPREL16_HIGHESTA R_PPC64 = 100 + R_PPC64_DTPREL16_DS R_PPC64 = 101 + R_PPC64_DTPREL16_LO_DS R_PPC64 = 102 + R_PPC64_DTPREL16_HIGHER R_PPC64 = 103 + R_PPC64_DTPREL16_HIGHERA R_PPC64 = 104 + R_PPC64_DTPREL16_HIGHEST R_PPC64 = 105 + R_PPC64_DTPREL16_HIGHESTA R_PPC64 = 106 + R_PPC64_TLSGD R_PPC64 = 107 + R_PPC64_TLSLD R_PPC64 = 108 + R_PPC64_TOCSAVE R_PPC64 = 109 + R_PPC64_ADDR16_HIGH R_PPC64 = 110 + R_PPC64_ADDR16_HIGHA R_PPC64 = 111 + R_PPC64_TPREL16_HIGH R_PPC64 = 112 + R_PPC64_TPREL16_HIGHA R_PPC64 = 113 + R_PPC64_DTPREL16_HIGH R_PPC64 = 114 + R_PPC64_DTPREL16_HIGHA R_PPC64 = 115 + R_PPC64_REL24_NOTOC R_PPC64 = 116 + R_PPC64_ADDR64_LOCAL R_PPC64 = 117 + R_PPC64_ENTRY R_PPC64 = 118 + R_PPC64_PLTSEQ R_PPC64 = 119 + R_PPC64_PLTCALL R_PPC64 = 120 + R_PPC64_PLTSEQ_NOTOC R_PPC64 = 121 + R_PPC64_PLTCALL_NOTOC R_PPC64 = 122 + R_PPC64_PCREL_OPT R_PPC64 = 123 + R_PPC64_D34 R_PPC64 = 128 + R_PPC64_D34_LO R_PPC64 = 129 + R_PPC64_D34_HI30 R_PPC64 = 130 + R_PPC64_D34_HA30 R_PPC64 = 131 + R_PPC64_PCREL34 R_PPC64 = 132 + R_PPC64_GOT_PCREL34 R_PPC64 = 133 + R_PPC64_PLT_PCREL34 R_PPC64 = 134 + R_PPC64_PLT_PCREL34_NOTOC R_PPC64 = 135 + R_PPC64_ADDR16_HIGHER34 R_PPC64 = 136 + R_PPC64_ADDR16_HIGHERA34 R_PPC64 = 137 + R_PPC64_ADDR16_HIGHEST34 R_PPC64 = 138 + R_PPC64_ADDR16_HIGHESTA34 R_PPC64 = 139 + R_PPC64_REL16_HIGHER34 R_PPC64 = 140 + R_PPC64_REL16_HIGHERA34 R_PPC64 = 141 + R_PPC64_REL16_HIGHEST34 R_PPC64 = 142 + R_PPC64_REL16_HIGHESTA34 R_PPC64 = 143 + R_PPC64_D28 R_PPC64 = 144 + R_PPC64_PCREL28 R_PPC64 = 145 + R_PPC64_TPREL34 R_PPC64 = 146 + R_PPC64_DTPREL34 R_PPC64 = 147 + R_PPC64_GOT_TLSGD_PCREL34 R_PPC64 = 148 + R_PPC64_GOT_TLSLD_PCREL34 R_PPC64 = 149 + R_PPC64_GOT_TPREL_PCREL34 R_PPC64 = 150 + R_PPC64_GOT_DTPREL_PCREL34 R_PPC64 = 151 + R_PPC64_REL16_HIGH R_PPC64 = 240 + R_PPC64_REL16_HIGHA R_PPC64 = 241 + R_PPC64_REL16_HIGHER R_PPC64 = 242 + R_PPC64_REL16_HIGHERA R_PPC64 = 243 + R_PPC64_REL16_HIGHEST R_PPC64 = 244 + R_PPC64_REL16_HIGHESTA R_PPC64 = 245 + R_PPC64_REL16DX_HA R_PPC64 = 246 // R_POWERPC_REL16DX_HA + R_PPC64_JMP_IREL R_PPC64 = 247 + R_PPC64_IRELATIVE R_PPC64 = 248 // R_POWERPC_IRELATIVE + R_PPC64_REL16 R_PPC64 = 249 // R_POWERPC_REL16 + R_PPC64_REL16_LO R_PPC64 = 250 // R_POWERPC_REL16_LO + R_PPC64_REL16_HI R_PPC64 = 251 // R_POWERPC_REL16_HI + R_PPC64_REL16_HA R_PPC64 = 252 // R_POWERPC_REL16_HA + R_PPC64_GNU_VTINHERIT R_PPC64 = 253 + R_PPC64_GNU_VTENTRY R_PPC64 = 254 +) + +var rppc64Strings = []intName{ + {0, "R_PPC64_NONE"}, + {1, "R_PPC64_ADDR32"}, + {2, "R_PPC64_ADDR24"}, + {3, "R_PPC64_ADDR16"}, + {4, "R_PPC64_ADDR16_LO"}, + {5, "R_PPC64_ADDR16_HI"}, + {6, "R_PPC64_ADDR16_HA"}, + {7, "R_PPC64_ADDR14"}, + {8, "R_PPC64_ADDR14_BRTAKEN"}, + {9, "R_PPC64_ADDR14_BRNTAKEN"}, + {10, "R_PPC64_REL24"}, + {11, "R_PPC64_REL14"}, + {12, "R_PPC64_REL14_BRTAKEN"}, + {13, "R_PPC64_REL14_BRNTAKEN"}, + {14, "R_PPC64_GOT16"}, + {15, "R_PPC64_GOT16_LO"}, + {16, "R_PPC64_GOT16_HI"}, + {17, "R_PPC64_GOT16_HA"}, + {19, "R_PPC64_COPY"}, + {20, "R_PPC64_GLOB_DAT"}, + {21, "R_PPC64_JMP_SLOT"}, + {22, "R_PPC64_RELATIVE"}, + {24, "R_PPC64_UADDR32"}, + {25, "R_PPC64_UADDR16"}, + {26, "R_PPC64_REL32"}, + {27, "R_PPC64_PLT32"}, + {28, "R_PPC64_PLTREL32"}, + {29, "R_PPC64_PLT16_LO"}, + {30, "R_PPC64_PLT16_HI"}, + {31, "R_PPC64_PLT16_HA"}, + {33, "R_PPC64_SECTOFF"}, + {34, "R_PPC64_SECTOFF_LO"}, + {35, "R_PPC64_SECTOFF_HI"}, + {36, "R_PPC64_SECTOFF_HA"}, + {37, "R_PPC64_REL30"}, + {38, "R_PPC64_ADDR64"}, + {39, "R_PPC64_ADDR16_HIGHER"}, + {40, "R_PPC64_ADDR16_HIGHERA"}, + {41, "R_PPC64_ADDR16_HIGHEST"}, + {42, "R_PPC64_ADDR16_HIGHESTA"}, + {43, "R_PPC64_UADDR64"}, + {44, "R_PPC64_REL64"}, + {45, "R_PPC64_PLT64"}, + {46, "R_PPC64_PLTREL64"}, + {47, "R_PPC64_TOC16"}, + {48, "R_PPC64_TOC16_LO"}, + {49, "R_PPC64_TOC16_HI"}, + {50, "R_PPC64_TOC16_HA"}, + {51, "R_PPC64_TOC"}, + {52, "R_PPC64_PLTGOT16"}, + {53, "R_PPC64_PLTGOT16_LO"}, + {54, "R_PPC64_PLTGOT16_HI"}, + {55, "R_PPC64_PLTGOT16_HA"}, + {56, "R_PPC64_ADDR16_DS"}, + {57, "R_PPC64_ADDR16_LO_DS"}, + {58, "R_PPC64_GOT16_DS"}, + {59, "R_PPC64_GOT16_LO_DS"}, + {60, "R_PPC64_PLT16_LO_DS"}, + {61, "R_PPC64_SECTOFF_DS"}, + {62, "R_PPC64_SECTOFF_LO_DS"}, + {63, "R_PPC64_TOC16_DS"}, + {64, "R_PPC64_TOC16_LO_DS"}, + {65, "R_PPC64_PLTGOT16_DS"}, + {66, "R_PPC64_PLTGOT_LO_DS"}, + {67, "R_PPC64_TLS"}, + {68, "R_PPC64_DTPMOD64"}, + {69, "R_PPC64_TPREL16"}, + {70, "R_PPC64_TPREL16_LO"}, + {71, "R_PPC64_TPREL16_HI"}, + {72, "R_PPC64_TPREL16_HA"}, + {73, "R_PPC64_TPREL64"}, + {74, "R_PPC64_DTPREL16"}, + {75, "R_PPC64_DTPREL16_LO"}, + {76, "R_PPC64_DTPREL16_HI"}, + {77, "R_PPC64_DTPREL16_HA"}, + {78, "R_PPC64_DTPREL64"}, + {79, "R_PPC64_GOT_TLSGD16"}, + {80, "R_PPC64_GOT_TLSGD16_LO"}, + {81, "R_PPC64_GOT_TLSGD16_HI"}, + {82, "R_PPC64_GOT_TLSGD16_HA"}, + {83, "R_PPC64_GOT_TLSLD16"}, + {84, "R_PPC64_GOT_TLSLD16_LO"}, + {85, "R_PPC64_GOT_TLSLD16_HI"}, + {86, "R_PPC64_GOT_TLSLD16_HA"}, + {87, "R_PPC64_GOT_TPREL16_DS"}, + {88, "R_PPC64_GOT_TPREL16_LO_DS"}, + {89, "R_PPC64_GOT_TPREL16_HI"}, + {90, "R_PPC64_GOT_TPREL16_HA"}, + {91, "R_PPC64_GOT_DTPREL16_DS"}, + {92, "R_PPC64_GOT_DTPREL16_LO_DS"}, + {93, "R_PPC64_GOT_DTPREL16_HI"}, + {94, "R_PPC64_GOT_DTPREL16_HA"}, + {95, "R_PPC64_TPREL16_DS"}, + {96, "R_PPC64_TPREL16_LO_DS"}, + {97, "R_PPC64_TPREL16_HIGHER"}, + {98, "R_PPC64_TPREL16_HIGHERA"}, + {99, "R_PPC64_TPREL16_HIGHEST"}, + {100, "R_PPC64_TPREL16_HIGHESTA"}, + {101, "R_PPC64_DTPREL16_DS"}, + {102, "R_PPC64_DTPREL16_LO_DS"}, + {103, "R_PPC64_DTPREL16_HIGHER"}, + {104, "R_PPC64_DTPREL16_HIGHERA"}, + {105, "R_PPC64_DTPREL16_HIGHEST"}, + {106, "R_PPC64_DTPREL16_HIGHESTA"}, + {107, "R_PPC64_TLSGD"}, + {108, "R_PPC64_TLSLD"}, + {109, "R_PPC64_TOCSAVE"}, + {110, "R_PPC64_ADDR16_HIGH"}, + {111, "R_PPC64_ADDR16_HIGHA"}, + {112, "R_PPC64_TPREL16_HIGH"}, + {113, "R_PPC64_TPREL16_HIGHA"}, + {114, "R_PPC64_DTPREL16_HIGH"}, + {115, "R_PPC64_DTPREL16_HIGHA"}, + {116, "R_PPC64_REL24_NOTOC"}, + {117, "R_PPC64_ADDR64_LOCAL"}, + {118, "R_PPC64_ENTRY"}, + {119, "R_PPC64_PLTSEQ"}, + {120, "R_PPC64_PLTCALL"}, + {121, "R_PPC64_PLTSEQ_NOTOC"}, + {122, "R_PPC64_PLTCALL_NOTOC"}, + {123, "R_PPC64_PCREL_OPT"}, + {128, "R_PPC64_D34"}, + {129, "R_PPC64_D34_LO"}, + {130, "R_PPC64_D34_HI30"}, + {131, "R_PPC64_D34_HA30"}, + {132, "R_PPC64_PCREL34"}, + {133, "R_PPC64_GOT_PCREL34"}, + {134, "R_PPC64_PLT_PCREL34"}, + {135, "R_PPC64_PLT_PCREL34_NOTOC"}, + {136, "R_PPC64_ADDR16_HIGHER34"}, + {137, "R_PPC64_ADDR16_HIGHERA34"}, + {138, "R_PPC64_ADDR16_HIGHEST34"}, + {139, "R_PPC64_ADDR16_HIGHESTA34"}, + {140, "R_PPC64_REL16_HIGHER34"}, + {141, "R_PPC64_REL16_HIGHERA34"}, + {142, "R_PPC64_REL16_HIGHEST34"}, + {143, "R_PPC64_REL16_HIGHESTA34"}, + {144, "R_PPC64_D28"}, + {145, "R_PPC64_PCREL28"}, + {146, "R_PPC64_TPREL34"}, + {147, "R_PPC64_DTPREL34"}, + {148, "R_PPC64_GOT_TLSGD_PCREL34"}, + {149, "R_PPC64_GOT_TLSLD_PCREL34"}, + {150, "R_PPC64_GOT_TPREL_PCREL34"}, + {151, "R_PPC64_GOT_DTPREL_PCREL34"}, + {240, "R_PPC64_REL16_HIGH"}, + {241, "R_PPC64_REL16_HIGHA"}, + {242, "R_PPC64_REL16_HIGHER"}, + {243, "R_PPC64_REL16_HIGHERA"}, + {244, "R_PPC64_REL16_HIGHEST"}, + {245, "R_PPC64_REL16_HIGHESTA"}, + {246, "R_PPC64_REL16DX_HA"}, + {247, "R_PPC64_JMP_IREL"}, + {248, "R_PPC64_IRELATIVE"}, + {249, "R_PPC64_REL16"}, + {250, "R_PPC64_REL16_LO"}, + {251, "R_PPC64_REL16_HI"}, + {252, "R_PPC64_REL16_HA"}, + {253, "R_PPC64_GNU_VTINHERIT"}, + {254, "R_PPC64_GNU_VTENTRY"}, +} + +func (i R_PPC64) String() string { return stringName(uint32(i), rppc64Strings, false) } +func (i R_PPC64) GoString() string { return stringName(uint32(i), rppc64Strings, true) } + +// Relocation types for RISC-V processors. +type R_RISCV int + +const ( + R_RISCV_NONE R_RISCV = 0 /* No relocation. */ + R_RISCV_32 R_RISCV = 1 /* Add 32 bit zero extended symbol value */ + R_RISCV_64 R_RISCV = 2 /* Add 64 bit symbol value. */ + R_RISCV_RELATIVE R_RISCV = 3 /* Add load address of shared object. */ + R_RISCV_COPY R_RISCV = 4 /* Copy data from shared object. */ + R_RISCV_JUMP_SLOT R_RISCV = 5 /* Set GOT entry to code address. */ + R_RISCV_TLS_DTPMOD32 R_RISCV = 6 /* 32 bit ID of module containing symbol */ + R_RISCV_TLS_DTPMOD64 R_RISCV = 7 /* ID of module containing symbol */ + R_RISCV_TLS_DTPREL32 R_RISCV = 8 /* 32 bit relative offset in TLS block */ + R_RISCV_TLS_DTPREL64 R_RISCV = 9 /* Relative offset in TLS block */ + R_RISCV_TLS_TPREL32 R_RISCV = 10 /* 32 bit relative offset in static TLS block */ + R_RISCV_TLS_TPREL64 R_RISCV = 11 /* Relative offset in static TLS block */ + R_RISCV_BRANCH R_RISCV = 16 /* PC-relative branch */ + R_RISCV_JAL R_RISCV = 17 /* PC-relative jump */ + R_RISCV_CALL R_RISCV = 18 /* PC-relative call */ + R_RISCV_CALL_PLT R_RISCV = 19 /* PC-relative call (PLT) */ + R_RISCV_GOT_HI20 R_RISCV = 20 /* PC-relative GOT reference */ + R_RISCV_TLS_GOT_HI20 R_RISCV = 21 /* PC-relative TLS IE GOT offset */ + R_RISCV_TLS_GD_HI20 R_RISCV = 22 /* PC-relative TLS GD reference */ + R_RISCV_PCREL_HI20 R_RISCV = 23 /* PC-relative reference */ + R_RISCV_PCREL_LO12_I R_RISCV = 24 /* PC-relative reference */ + R_RISCV_PCREL_LO12_S R_RISCV = 25 /* PC-relative reference */ + R_RISCV_HI20 R_RISCV = 26 /* Absolute address */ + R_RISCV_LO12_I R_RISCV = 27 /* Absolute address */ + R_RISCV_LO12_S R_RISCV = 28 /* Absolute address */ + R_RISCV_TPREL_HI20 R_RISCV = 29 /* TLS LE thread offset */ + R_RISCV_TPREL_LO12_I R_RISCV = 30 /* TLS LE thread offset */ + R_RISCV_TPREL_LO12_S R_RISCV = 31 /* TLS LE thread offset */ + R_RISCV_TPREL_ADD R_RISCV = 32 /* TLS LE thread usage */ + R_RISCV_ADD8 R_RISCV = 33 /* 8-bit label addition */ + R_RISCV_ADD16 R_RISCV = 34 /* 16-bit label addition */ + R_RISCV_ADD32 R_RISCV = 35 /* 32-bit label addition */ + R_RISCV_ADD64 R_RISCV = 36 /* 64-bit label addition */ + R_RISCV_SUB8 R_RISCV = 37 /* 8-bit label subtraction */ + R_RISCV_SUB16 R_RISCV = 38 /* 16-bit label subtraction */ + R_RISCV_SUB32 R_RISCV = 39 /* 32-bit label subtraction */ + R_RISCV_SUB64 R_RISCV = 40 /* 64-bit label subtraction */ + R_RISCV_GNU_VTINHERIT R_RISCV = 41 /* GNU C++ vtable hierarchy */ + R_RISCV_GNU_VTENTRY R_RISCV = 42 /* GNU C++ vtable member usage */ + R_RISCV_ALIGN R_RISCV = 43 /* Alignment statement */ + R_RISCV_RVC_BRANCH R_RISCV = 44 /* PC-relative branch offset */ + R_RISCV_RVC_JUMP R_RISCV = 45 /* PC-relative jump offset */ + R_RISCV_RVC_LUI R_RISCV = 46 /* Absolute address */ + R_RISCV_GPREL_I R_RISCV = 47 /* GP-relative reference */ + R_RISCV_GPREL_S R_RISCV = 48 /* GP-relative reference */ + R_RISCV_TPREL_I R_RISCV = 49 /* TP-relative TLS LE load */ + R_RISCV_TPREL_S R_RISCV = 50 /* TP-relative TLS LE store */ + R_RISCV_RELAX R_RISCV = 51 /* Instruction pair can be relaxed */ + R_RISCV_SUB6 R_RISCV = 52 /* Local label subtraction */ + R_RISCV_SET6 R_RISCV = 53 /* Local label subtraction */ + R_RISCV_SET8 R_RISCV = 54 /* Local label subtraction */ + R_RISCV_SET16 R_RISCV = 55 /* Local label subtraction */ + R_RISCV_SET32 R_RISCV = 56 /* Local label subtraction */ + R_RISCV_32_PCREL R_RISCV = 57 /* 32-bit PC relative */ +) + +var rriscvStrings = []intName{ + {0, "R_RISCV_NONE"}, + {1, "R_RISCV_32"}, + {2, "R_RISCV_64"}, + {3, "R_RISCV_RELATIVE"}, + {4, "R_RISCV_COPY"}, + {5, "R_RISCV_JUMP_SLOT"}, + {6, "R_RISCV_TLS_DTPMOD32"}, + {7, "R_RISCV_TLS_DTPMOD64"}, + {8, "R_RISCV_TLS_DTPREL32"}, + {9, "R_RISCV_TLS_DTPREL64"}, + {10, "R_RISCV_TLS_TPREL32"}, + {11, "R_RISCV_TLS_TPREL64"}, + {16, "R_RISCV_BRANCH"}, + {17, "R_RISCV_JAL"}, + {18, "R_RISCV_CALL"}, + {19, "R_RISCV_CALL_PLT"}, + {20, "R_RISCV_GOT_HI20"}, + {21, "R_RISCV_TLS_GOT_HI20"}, + {22, "R_RISCV_TLS_GD_HI20"}, + {23, "R_RISCV_PCREL_HI20"}, + {24, "R_RISCV_PCREL_LO12_I"}, + {25, "R_RISCV_PCREL_LO12_S"}, + {26, "R_RISCV_HI20"}, + {27, "R_RISCV_LO12_I"}, + {28, "R_RISCV_LO12_S"}, + {29, "R_RISCV_TPREL_HI20"}, + {30, "R_RISCV_TPREL_LO12_I"}, + {31, "R_RISCV_TPREL_LO12_S"}, + {32, "R_RISCV_TPREL_ADD"}, + {33, "R_RISCV_ADD8"}, + {34, "R_RISCV_ADD16"}, + {35, "R_RISCV_ADD32"}, + {36, "R_RISCV_ADD64"}, + {37, "R_RISCV_SUB8"}, + {38, "R_RISCV_SUB16"}, + {39, "R_RISCV_SUB32"}, + {40, "R_RISCV_SUB64"}, + {41, "R_RISCV_GNU_VTINHERIT"}, + {42, "R_RISCV_GNU_VTENTRY"}, + {43, "R_RISCV_ALIGN"}, + {44, "R_RISCV_RVC_BRANCH"}, + {45, "R_RISCV_RVC_JUMP"}, + {46, "R_RISCV_RVC_LUI"}, + {47, "R_RISCV_GPREL_I"}, + {48, "R_RISCV_GPREL_S"}, + {49, "R_RISCV_TPREL_I"}, + {50, "R_RISCV_TPREL_S"}, + {51, "R_RISCV_RELAX"}, + {52, "R_RISCV_SUB6"}, + {53, "R_RISCV_SET6"}, + {54, "R_RISCV_SET8"}, + {55, "R_RISCV_SET16"}, + {56, "R_RISCV_SET32"}, + {57, "R_RISCV_32_PCREL"}, +} + +func (i R_RISCV) String() string { return stringName(uint32(i), rriscvStrings, false) } +func (i R_RISCV) GoString() string { return stringName(uint32(i), rriscvStrings, true) } + +// Relocation types for s390x processors. +type R_390 int + +const ( + R_390_NONE R_390 = 0 + R_390_8 R_390 = 1 + R_390_12 R_390 = 2 + R_390_16 R_390 = 3 + R_390_32 R_390 = 4 + R_390_PC32 R_390 = 5 + R_390_GOT12 R_390 = 6 + R_390_GOT32 R_390 = 7 + R_390_PLT32 R_390 = 8 + R_390_COPY R_390 = 9 + R_390_GLOB_DAT R_390 = 10 + R_390_JMP_SLOT R_390 = 11 + R_390_RELATIVE R_390 = 12 + R_390_GOTOFF R_390 = 13 + R_390_GOTPC R_390 = 14 + R_390_GOT16 R_390 = 15 + R_390_PC16 R_390 = 16 + R_390_PC16DBL R_390 = 17 + R_390_PLT16DBL R_390 = 18 + R_390_PC32DBL R_390 = 19 + R_390_PLT32DBL R_390 = 20 + R_390_GOTPCDBL R_390 = 21 + R_390_64 R_390 = 22 + R_390_PC64 R_390 = 23 + R_390_GOT64 R_390 = 24 + R_390_PLT64 R_390 = 25 + R_390_GOTENT R_390 = 26 + R_390_GOTOFF16 R_390 = 27 + R_390_GOTOFF64 R_390 = 28 + R_390_GOTPLT12 R_390 = 29 + R_390_GOTPLT16 R_390 = 30 + R_390_GOTPLT32 R_390 = 31 + R_390_GOTPLT64 R_390 = 32 + R_390_GOTPLTENT R_390 = 33 + R_390_GOTPLTOFF16 R_390 = 34 + R_390_GOTPLTOFF32 R_390 = 35 + R_390_GOTPLTOFF64 R_390 = 36 + R_390_TLS_LOAD R_390 = 37 + R_390_TLS_GDCALL R_390 = 38 + R_390_TLS_LDCALL R_390 = 39 + R_390_TLS_GD32 R_390 = 40 + R_390_TLS_GD64 R_390 = 41 + R_390_TLS_GOTIE12 R_390 = 42 + R_390_TLS_GOTIE32 R_390 = 43 + R_390_TLS_GOTIE64 R_390 = 44 + R_390_TLS_LDM32 R_390 = 45 + R_390_TLS_LDM64 R_390 = 46 + R_390_TLS_IE32 R_390 = 47 + R_390_TLS_IE64 R_390 = 48 + R_390_TLS_IEENT R_390 = 49 + R_390_TLS_LE32 R_390 = 50 + R_390_TLS_LE64 R_390 = 51 + R_390_TLS_LDO32 R_390 = 52 + R_390_TLS_LDO64 R_390 = 53 + R_390_TLS_DTPMOD R_390 = 54 + R_390_TLS_DTPOFF R_390 = 55 + R_390_TLS_TPOFF R_390 = 56 + R_390_20 R_390 = 57 + R_390_GOT20 R_390 = 58 + R_390_GOTPLT20 R_390 = 59 + R_390_TLS_GOTIE20 R_390 = 60 +) + +var r390Strings = []intName{ + {0, "R_390_NONE"}, + {1, "R_390_8"}, + {2, "R_390_12"}, + {3, "R_390_16"}, + {4, "R_390_32"}, + {5, "R_390_PC32"}, + {6, "R_390_GOT12"}, + {7, "R_390_GOT32"}, + {8, "R_390_PLT32"}, + {9, "R_390_COPY"}, + {10, "R_390_GLOB_DAT"}, + {11, "R_390_JMP_SLOT"}, + {12, "R_390_RELATIVE"}, + {13, "R_390_GOTOFF"}, + {14, "R_390_GOTPC"}, + {15, "R_390_GOT16"}, + {16, "R_390_PC16"}, + {17, "R_390_PC16DBL"}, + {18, "R_390_PLT16DBL"}, + {19, "R_390_PC32DBL"}, + {20, "R_390_PLT32DBL"}, + {21, "R_390_GOTPCDBL"}, + {22, "R_390_64"}, + {23, "R_390_PC64"}, + {24, "R_390_GOT64"}, + {25, "R_390_PLT64"}, + {26, "R_390_GOTENT"}, + {27, "R_390_GOTOFF16"}, + {28, "R_390_GOTOFF64"}, + {29, "R_390_GOTPLT12"}, + {30, "R_390_GOTPLT16"}, + {31, "R_390_GOTPLT32"}, + {32, "R_390_GOTPLT64"}, + {33, "R_390_GOTPLTENT"}, + {34, "R_390_GOTPLTOFF16"}, + {35, "R_390_GOTPLTOFF32"}, + {36, "R_390_GOTPLTOFF64"}, + {37, "R_390_TLS_LOAD"}, + {38, "R_390_TLS_GDCALL"}, + {39, "R_390_TLS_LDCALL"}, + {40, "R_390_TLS_GD32"}, + {41, "R_390_TLS_GD64"}, + {42, "R_390_TLS_GOTIE12"}, + {43, "R_390_TLS_GOTIE32"}, + {44, "R_390_TLS_GOTIE64"}, + {45, "R_390_TLS_LDM32"}, + {46, "R_390_TLS_LDM64"}, + {47, "R_390_TLS_IE32"}, + {48, "R_390_TLS_IE64"}, + {49, "R_390_TLS_IEENT"}, + {50, "R_390_TLS_LE32"}, + {51, "R_390_TLS_LE64"}, + {52, "R_390_TLS_LDO32"}, + {53, "R_390_TLS_LDO64"}, + {54, "R_390_TLS_DTPMOD"}, + {55, "R_390_TLS_DTPOFF"}, + {56, "R_390_TLS_TPOFF"}, + {57, "R_390_20"}, + {58, "R_390_GOT20"}, + {59, "R_390_GOTPLT20"}, + {60, "R_390_TLS_GOTIE20"}, +} + +func (i R_390) String() string { return stringName(uint32(i), r390Strings, false) } +func (i R_390) GoString() string { return stringName(uint32(i), r390Strings, true) } + +// Relocation types for SPARC. +type R_SPARC int + +const ( + R_SPARC_NONE R_SPARC = 0 + R_SPARC_8 R_SPARC = 1 + R_SPARC_16 R_SPARC = 2 + R_SPARC_32 R_SPARC = 3 + R_SPARC_DISP8 R_SPARC = 4 + R_SPARC_DISP16 R_SPARC = 5 + R_SPARC_DISP32 R_SPARC = 6 + R_SPARC_WDISP30 R_SPARC = 7 + R_SPARC_WDISP22 R_SPARC = 8 + R_SPARC_HI22 R_SPARC = 9 + R_SPARC_22 R_SPARC = 10 + R_SPARC_13 R_SPARC = 11 + R_SPARC_LO10 R_SPARC = 12 + R_SPARC_GOT10 R_SPARC = 13 + R_SPARC_GOT13 R_SPARC = 14 + R_SPARC_GOT22 R_SPARC = 15 + R_SPARC_PC10 R_SPARC = 16 + R_SPARC_PC22 R_SPARC = 17 + R_SPARC_WPLT30 R_SPARC = 18 + R_SPARC_COPY R_SPARC = 19 + R_SPARC_GLOB_DAT R_SPARC = 20 + R_SPARC_JMP_SLOT R_SPARC = 21 + R_SPARC_RELATIVE R_SPARC = 22 + R_SPARC_UA32 R_SPARC = 23 + R_SPARC_PLT32 R_SPARC = 24 + R_SPARC_HIPLT22 R_SPARC = 25 + R_SPARC_LOPLT10 R_SPARC = 26 + R_SPARC_PCPLT32 R_SPARC = 27 + R_SPARC_PCPLT22 R_SPARC = 28 + R_SPARC_PCPLT10 R_SPARC = 29 + R_SPARC_10 R_SPARC = 30 + R_SPARC_11 R_SPARC = 31 + R_SPARC_64 R_SPARC = 32 + R_SPARC_OLO10 R_SPARC = 33 + R_SPARC_HH22 R_SPARC = 34 + R_SPARC_HM10 R_SPARC = 35 + R_SPARC_LM22 R_SPARC = 36 + R_SPARC_PC_HH22 R_SPARC = 37 + R_SPARC_PC_HM10 R_SPARC = 38 + R_SPARC_PC_LM22 R_SPARC = 39 + R_SPARC_WDISP16 R_SPARC = 40 + R_SPARC_WDISP19 R_SPARC = 41 + R_SPARC_GLOB_JMP R_SPARC = 42 + R_SPARC_7 R_SPARC = 43 + R_SPARC_5 R_SPARC = 44 + R_SPARC_6 R_SPARC = 45 + R_SPARC_DISP64 R_SPARC = 46 + R_SPARC_PLT64 R_SPARC = 47 + R_SPARC_HIX22 R_SPARC = 48 + R_SPARC_LOX10 R_SPARC = 49 + R_SPARC_H44 R_SPARC = 50 + R_SPARC_M44 R_SPARC = 51 + R_SPARC_L44 R_SPARC = 52 + R_SPARC_REGISTER R_SPARC = 53 + R_SPARC_UA64 R_SPARC = 54 + R_SPARC_UA16 R_SPARC = 55 +) + +var rsparcStrings = []intName{ + {0, "R_SPARC_NONE"}, + {1, "R_SPARC_8"}, + {2, "R_SPARC_16"}, + {3, "R_SPARC_32"}, + {4, "R_SPARC_DISP8"}, + {5, "R_SPARC_DISP16"}, + {6, "R_SPARC_DISP32"}, + {7, "R_SPARC_WDISP30"}, + {8, "R_SPARC_WDISP22"}, + {9, "R_SPARC_HI22"}, + {10, "R_SPARC_22"}, + {11, "R_SPARC_13"}, + {12, "R_SPARC_LO10"}, + {13, "R_SPARC_GOT10"}, + {14, "R_SPARC_GOT13"}, + {15, "R_SPARC_GOT22"}, + {16, "R_SPARC_PC10"}, + {17, "R_SPARC_PC22"}, + {18, "R_SPARC_WPLT30"}, + {19, "R_SPARC_COPY"}, + {20, "R_SPARC_GLOB_DAT"}, + {21, "R_SPARC_JMP_SLOT"}, + {22, "R_SPARC_RELATIVE"}, + {23, "R_SPARC_UA32"}, + {24, "R_SPARC_PLT32"}, + {25, "R_SPARC_HIPLT22"}, + {26, "R_SPARC_LOPLT10"}, + {27, "R_SPARC_PCPLT32"}, + {28, "R_SPARC_PCPLT22"}, + {29, "R_SPARC_PCPLT10"}, + {30, "R_SPARC_10"}, + {31, "R_SPARC_11"}, + {32, "R_SPARC_64"}, + {33, "R_SPARC_OLO10"}, + {34, "R_SPARC_HH22"}, + {35, "R_SPARC_HM10"}, + {36, "R_SPARC_LM22"}, + {37, "R_SPARC_PC_HH22"}, + {38, "R_SPARC_PC_HM10"}, + {39, "R_SPARC_PC_LM22"}, + {40, "R_SPARC_WDISP16"}, + {41, "R_SPARC_WDISP19"}, + {42, "R_SPARC_GLOB_JMP"}, + {43, "R_SPARC_7"}, + {44, "R_SPARC_5"}, + {45, "R_SPARC_6"}, + {46, "R_SPARC_DISP64"}, + {47, "R_SPARC_PLT64"}, + {48, "R_SPARC_HIX22"}, + {49, "R_SPARC_LOX10"}, + {50, "R_SPARC_H44"}, + {51, "R_SPARC_M44"}, + {52, "R_SPARC_L44"}, + {53, "R_SPARC_REGISTER"}, + {54, "R_SPARC_UA64"}, + {55, "R_SPARC_UA16"}, +} + +func (i R_SPARC) String() string { return stringName(uint32(i), rsparcStrings, false) } +func (i R_SPARC) GoString() string { return stringName(uint32(i), rsparcStrings, true) } + +// Magic number for the elf trampoline, chosen wisely to be an immediate value. +const ARM_MAGIC_TRAMP_NUMBER = 0x5c000003 + +// ELF32 File header. +type Header32 struct { + Ident [EI_NIDENT]byte /* File identification. */ + Type uint16 /* File type. */ + Machine uint16 /* Machine architecture. */ + Version uint32 /* ELF format version. */ + Entry uint32 /* Entry point. */ + Phoff uint32 /* Program header file offset. */ + Shoff uint32 /* Section header file offset. */ + Flags uint32 /* Architecture-specific flags. */ + Ehsize uint16 /* Size of ELF header in bytes. */ + Phentsize uint16 /* Size of program header entry. */ + Phnum uint16 /* Number of program header entries. */ + Shentsize uint16 /* Size of section header entry. */ + Shnum uint16 /* Number of section header entries. */ + Shstrndx uint16 /* Section name strings section. */ +} + +// ELF32 Section header. +type Section32 struct { + Name uint32 /* Section name (index into the section header string table). */ + Type uint32 /* Section type. */ + Flags uint32 /* Section flags. */ + Addr uint32 /* Address in memory image. */ + Off uint32 /* Offset in file. */ + Size uint32 /* Size in bytes. */ + Link uint32 /* Index of a related section. */ + Info uint32 /* Depends on section type. */ + Addralign uint32 /* Alignment in bytes. */ + Entsize uint32 /* Size of each entry in section. */ +} + +// ELF32 Program header. +type Prog32 struct { + Type uint32 /* Entry type. */ + Off uint32 /* File offset of contents. */ + Vaddr uint32 /* Virtual address in memory image. */ + Paddr uint32 /* Physical address (not used). */ + Filesz uint32 /* Size of contents in file. */ + Memsz uint32 /* Size of contents in memory. */ + Flags uint32 /* Access permission flags. */ + Align uint32 /* Alignment in memory and file. */ +} + +// ELF32 Dynamic structure. The ".dynamic" section contains an array of them. +type Dyn32 struct { + Tag int32 /* Entry type. */ + Val uint32 /* Integer/Address value. */ +} + +// ELF32 Compression header. +type Chdr32 struct { + Type uint32 + Size uint32 + Addralign uint32 +} + +/* + * Relocation entries. + */ + +// ELF32 Relocations that don't need an addend field. +type Rel32 struct { + Off uint32 /* Location to be relocated. */ + Info uint32 /* Relocation type and symbol index. */ +} + +// ELF32 Relocations that need an addend field. +type Rela32 struct { + Off uint32 /* Location to be relocated. */ + Info uint32 /* Relocation type and symbol index. */ + Addend int32 /* Addend. */ +} + +func R_SYM32(info uint32) uint32 { return info >> 8 } +func R_TYPE32(info uint32) uint32 { return info & 0xff } +func R_INFO32(sym, typ uint32) uint32 { return sym<<8 | typ } + +// ELF32 Symbol. +type Sym32 struct { + Name uint32 + Value uint32 + Size uint32 + Info uint8 + Other uint8 + Shndx uint16 +} + +const Sym32Size = 16 + +func ST_BIND(info uint8) SymBind { return SymBind(info >> 4) } +func ST_TYPE(info uint8) SymType { return SymType(info & 0xF) } +func ST_INFO(bind SymBind, typ SymType) uint8 { + return uint8(bind)<<4 | uint8(typ)&0xf +} +func ST_VISIBILITY(other uint8) SymVis { return SymVis(other & 3) } + +/* + * ELF64 + */ + +// ELF64 file header. +type Header64 struct { + Ident [EI_NIDENT]byte /* File identification. */ + Type uint16 /* File type. */ + Machine uint16 /* Machine architecture. */ + Version uint32 /* ELF format version. */ + Entry uint64 /* Entry point. */ + Phoff uint64 /* Program header file offset. */ + Shoff uint64 /* Section header file offset. */ + Flags uint32 /* Architecture-specific flags. */ + Ehsize uint16 /* Size of ELF header in bytes. */ + Phentsize uint16 /* Size of program header entry. */ + Phnum uint16 /* Number of program header entries. */ + Shentsize uint16 /* Size of section header entry. */ + Shnum uint16 /* Number of section header entries. */ + Shstrndx uint16 /* Section name strings section. */ +} + +// ELF64 Section header. +type Section64 struct { + Name uint32 /* Section name (index into the section header string table). */ + Type uint32 /* Section type. */ + Flags uint64 /* Section flags. */ + Addr uint64 /* Address in memory image. */ + Off uint64 /* Offset in file. */ + Size uint64 /* Size in bytes. */ + Link uint32 /* Index of a related section. */ + Info uint32 /* Depends on section type. */ + Addralign uint64 /* Alignment in bytes. */ + Entsize uint64 /* Size of each entry in section. */ +} + +// ELF64 Program header. +type Prog64 struct { + Type uint32 /* Entry type. */ + Flags uint32 /* Access permission flags. */ + Off uint64 /* File offset of contents. */ + Vaddr uint64 /* Virtual address in memory image. */ + Paddr uint64 /* Physical address (not used). */ + Filesz uint64 /* Size of contents in file. */ + Memsz uint64 /* Size of contents in memory. */ + Align uint64 /* Alignment in memory and file. */ +} + +// ELF64 Dynamic structure. The ".dynamic" section contains an array of them. +type Dyn64 struct { + Tag int64 /* Entry type. */ + Val uint64 /* Integer/address value */ +} + +// ELF64 Compression header. +type Chdr64 struct { + Type uint32 + _ uint32 /* Reserved. */ + Size uint64 + Addralign uint64 +} + +/* + * Relocation entries. + */ + +/* ELF64 relocations that don't need an addend field. */ +type Rel64 struct { + Off uint64 /* Location to be relocated. */ + Info uint64 /* Relocation type and symbol index. */ +} + +/* ELF64 relocations that need an addend field. */ +type Rela64 struct { + Off uint64 /* Location to be relocated. */ + Info uint64 /* Relocation type and symbol index. */ + Addend int64 /* Addend. */ +} + +func R_SYM64(info uint64) uint32 { return uint32(info >> 32) } +func R_TYPE64(info uint64) uint32 { return uint32(info) } +func R_INFO(sym, typ uint32) uint64 { return uint64(sym)<<32 | uint64(typ) } + +// ELF64 symbol table entries. +type Sym64 struct { + Name uint32 /* String table index of name. */ + Info uint8 /* Type and binding information. */ + Other uint8 /* Reserved (not used). */ + Shndx uint16 /* Section index of symbol. */ + Value uint64 /* Symbol value. */ + Size uint64 /* Size of associated object. */ +} + +const Sym64Size = 24 + +type intName struct { + i uint32 + s string +} + +func stringName(i uint32, names []intName, goSyntax bool) string { + for _, n := range names { + if n.i == i { + if goSyntax { + return "elf." + n.s + } + return n.s + } + } + + // second pass - look for smaller to add with. + // assume sorted already + for j := len(names) - 1; j >= 0; j-- { + n := names[j] + if n.i < i { + s := n.s + if goSyntax { + s = "elf." + s + } + return s + "+" + strconv.FormatUint(uint64(i-n.i), 10) + } + } + + return strconv.FormatUint(uint64(i), 10) +} + +func flagName(i uint32, names []intName, goSyntax bool) string { + s := "" + for _, n := range names { + if n.i&i == n.i { + if len(s) > 0 { + s += "+" + } + if goSyntax { + s += "elf." + } + s += n.s + i -= n.i + } + } + if len(s) == 0 { + return "0x" + strconv.FormatUint(uint64(i), 16) + } + if i != 0 { + s += "+0x" + strconv.FormatUint(uint64(i), 16) + } + return s +} diff --git a/src/debug/elf/elf_test.go b/src/debug/elf/elf_test.go new file mode 100644 index 0000000..814c6bd --- /dev/null +++ b/src/debug/elf/elf_test.go @@ -0,0 +1,50 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package elf + +import ( + "fmt" + "testing" +) + +type nameTest struct { + val any + str string +} + +var nameTests = []nameTest{ + {ELFOSABI_LINUX, "ELFOSABI_LINUX"}, + {ET_EXEC, "ET_EXEC"}, + {EM_860, "EM_860"}, + {SHN_LOPROC, "SHN_LOPROC"}, + {SHT_PROGBITS, "SHT_PROGBITS"}, + {SHF_MERGE + SHF_TLS, "SHF_MERGE+SHF_TLS"}, + {PT_LOAD, "PT_LOAD"}, + {PF_W + PF_R + 0x50, "PF_W+PF_R+0x50"}, + {DT_SYMBOLIC, "DT_SYMBOLIC"}, + {DF_BIND_NOW, "DF_BIND_NOW"}, + {NT_FPREGSET, "NT_FPREGSET"}, + {STB_GLOBAL, "STB_GLOBAL"}, + {STT_COMMON, "STT_COMMON"}, + {STV_HIDDEN, "STV_HIDDEN"}, + {R_X86_64_PC32, "R_X86_64_PC32"}, + {R_ALPHA_OP_PUSH, "R_ALPHA_OP_PUSH"}, + {R_ARM_THM_ABS5, "R_ARM_THM_ABS5"}, + {R_386_GOT32, "R_386_GOT32"}, + {R_PPC_GOT16_HI, "R_PPC_GOT16_HI"}, + {R_SPARC_GOT22, "R_SPARC_GOT22"}, + {ET_LOOS + 5, "ET_LOOS+5"}, + {ProgFlag(0x50), "0x50"}, + {COMPRESS_ZLIB + 1, "COMPRESS_ZLIB+1"}, +} + +func TestNames(t *testing.T) { + for i, tt := range nameTests { + s := fmt.Sprint(tt.val) + if s != tt.str { + t.Errorf("#%d: Sprint(%d) = %q, want %q", i, tt.val, s, tt.str) + } + } +} diff --git a/src/debug/elf/file.go b/src/debug/elf/file.go new file mode 100644 index 0000000..88b9576 --- /dev/null +++ b/src/debug/elf/file.go @@ -0,0 +1,1649 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package elf implements access to ELF object files. + +# Security + +This package is not designed to be hardened against adversarial inputs, and is +outside the scope of https://go.dev/security/policy. In particular, only basic +validation is done when parsing object files. As such, care should be taken when +parsing untrusted inputs, as parsing malformed files may consume significant +resources, or cause panics. +*/ +package elf + +import ( + "bytes" + "compress/zlib" + "debug/dwarf" + "encoding/binary" + "errors" + "fmt" + "internal/saferio" + "io" + "os" + "strings" +) + +// seekStart, seekCurrent, seekEnd are copies of +// io.SeekStart, io.SeekCurrent, and io.SeekEnd. +// We can't use the ones from package io because +// we want this code to build with Go 1.4 during +// cmd/dist bootstrap. +const ( + seekStart int = 0 + seekCurrent int = 1 + seekEnd int = 2 +) + +// TODO: error reporting detail + +/* + * Internal ELF representation + */ + +// A FileHeader represents an ELF file header. +type FileHeader struct { + Class Class + Data Data + Version Version + OSABI OSABI + ABIVersion uint8 + ByteOrder binary.ByteOrder + Type Type + Machine Machine + Entry uint64 +} + +// A File represents an open ELF file. +type File struct { + FileHeader + Sections []*Section + Progs []*Prog + closer io.Closer + gnuNeed []verneed + gnuVersym []byte +} + +// A SectionHeader represents a single ELF section header. +type SectionHeader struct { + Name string + Type SectionType + Flags SectionFlag + Addr uint64 + Offset uint64 + Size uint64 + Link uint32 + Info uint32 + Addralign uint64 + Entsize uint64 + + // FileSize is the size of this section in the file in bytes. + // If a section is compressed, FileSize is the size of the + // compressed data, while Size (above) is the size of the + // uncompressed data. + FileSize uint64 +} + +// A Section represents a single section in an ELF file. +type Section struct { + SectionHeader + + // Embed ReaderAt for ReadAt method. + // Do not embed SectionReader directly + // to avoid having Read and Seek. + // If a client wants Read and Seek it must use + // Open() to avoid fighting over the seek offset + // with other clients. + // + // ReaderAt may be nil if the section is not easily available + // in a random-access form. For example, a compressed section + // may have a nil ReaderAt. + io.ReaderAt + sr *io.SectionReader + + compressionType CompressionType + compressionOffset int64 +} + +// Data reads and returns the contents of the ELF section. +// Even if the section is stored compressed in the ELF file, +// Data returns uncompressed data. +// +// For an SHT_NOBITS section, Data always returns a non-nil error. +func (s *Section) Data() ([]byte, error) { + return saferio.ReadData(s.Open(), s.Size) +} + +// stringTable reads and returns the string table given by the +// specified link value. +func (f *File) stringTable(link uint32) ([]byte, error) { + if link <= 0 || link >= uint32(len(f.Sections)) { + return nil, errors.New("section has invalid string table link") + } + return f.Sections[link].Data() +} + +// Open returns a new ReadSeeker reading the ELF section. +// Even if the section is stored compressed in the ELF file, +// the ReadSeeker reads uncompressed data. +// +// For an SHT_NOBITS section, all calls to the opened reader +// will return a non-nil error. +func (s *Section) Open() io.ReadSeeker { + if s.Type == SHT_NOBITS { + return io.NewSectionReader(&nobitsSectionReader{}, 0, int64(s.Size)) + } + if s.Flags&SHF_COMPRESSED == 0 { + return io.NewSectionReader(s.sr, 0, 1<<63-1) + } + if s.compressionType == COMPRESS_ZLIB { + return &readSeekerFromReader{ + reset: func() (io.Reader, error) { + fr := io.NewSectionReader(s.sr, s.compressionOffset, int64(s.FileSize)-s.compressionOffset) + return zlib.NewReader(fr) + }, + size: int64(s.Size), + } + } + err := &FormatError{int64(s.Offset), "unknown compression type", s.compressionType} + return errorReader{err} +} + +// A ProgHeader represents a single ELF program header. +type ProgHeader struct { + Type ProgType + Flags ProgFlag + Off uint64 + Vaddr uint64 + Paddr uint64 + Filesz uint64 + Memsz uint64 + Align uint64 +} + +// A Prog represents a single ELF program header in an ELF binary. +type Prog struct { + ProgHeader + + // Embed ReaderAt for ReadAt method. + // Do not embed SectionReader directly + // to avoid having Read and Seek. + // If a client wants Read and Seek it must use + // Open() to avoid fighting over the seek offset + // with other clients. + io.ReaderAt + sr *io.SectionReader +} + +// Open returns a new ReadSeeker reading the ELF program body. +func (p *Prog) Open() io.ReadSeeker { return io.NewSectionReader(p.sr, 0, 1<<63-1) } + +// A Symbol represents an entry in an ELF symbol table section. +type Symbol struct { + Name string + Info, Other byte + Section SectionIndex + Value, Size uint64 + + // Version and Library are present only for the dynamic symbol + // table. + Version string + Library string +} + +/* + * ELF reader + */ + +type FormatError struct { + off int64 + msg string + val any +} + +func (e *FormatError) Error() string { + msg := e.msg + if e.val != nil { + msg += fmt.Sprintf(" '%v' ", e.val) + } + msg += fmt.Sprintf("in record at byte %#x", e.off) + return msg +} + +// Open opens the named file using os.Open and prepares it for use as an ELF binary. +func Open(name string) (*File, error) { + f, err := os.Open(name) + if err != nil { + return nil, err + } + ff, err := NewFile(f) + if err != nil { + f.Close() + return nil, err + } + ff.closer = f + return ff, nil +} + +// Close closes the File. +// If the File was created using NewFile directly instead of Open, +// Close has no effect. +func (f *File) Close() error { + var err error + if f.closer != nil { + err = f.closer.Close() + f.closer = nil + } + return err +} + +// SectionByType returns the first section in f with the +// given type, or nil if there is no such section. +func (f *File) SectionByType(typ SectionType) *Section { + for _, s := range f.Sections { + if s.Type == typ { + return s + } + } + return nil +} + +// NewFile creates a new File for accessing an ELF binary in an underlying reader. +// The ELF binary is expected to start at position 0 in the ReaderAt. +func NewFile(r io.ReaderAt) (*File, error) { + sr := io.NewSectionReader(r, 0, 1<<63-1) + // Read and decode ELF identifier + var ident [16]uint8 + if _, err := r.ReadAt(ident[0:], 0); err != nil { + return nil, err + } + if ident[0] != '\x7f' || ident[1] != 'E' || ident[2] != 'L' || ident[3] != 'F' { + return nil, &FormatError{0, "bad magic number", ident[0:4]} + } + + f := new(File) + f.Class = Class(ident[EI_CLASS]) + switch f.Class { + case ELFCLASS32: + case ELFCLASS64: + // ok + default: + return nil, &FormatError{0, "unknown ELF class", f.Class} + } + + f.Data = Data(ident[EI_DATA]) + switch f.Data { + case ELFDATA2LSB: + f.ByteOrder = binary.LittleEndian + case ELFDATA2MSB: + f.ByteOrder = binary.BigEndian + default: + return nil, &FormatError{0, "unknown ELF data encoding", f.Data} + } + + f.Version = Version(ident[EI_VERSION]) + if f.Version != EV_CURRENT { + return nil, &FormatError{0, "unknown ELF version", f.Version} + } + + f.OSABI = OSABI(ident[EI_OSABI]) + f.ABIVersion = ident[EI_ABIVERSION] + + // Read ELF file header + var phoff int64 + var phentsize, phnum int + var shoff int64 + var shentsize, shnum, shstrndx int + switch f.Class { + case ELFCLASS32: + hdr := new(Header32) + sr.Seek(0, seekStart) + if err := binary.Read(sr, f.ByteOrder, hdr); err != nil { + return nil, err + } + f.Type = Type(hdr.Type) + f.Machine = Machine(hdr.Machine) + f.Entry = uint64(hdr.Entry) + if v := Version(hdr.Version); v != f.Version { + return nil, &FormatError{0, "mismatched ELF version", v} + } + phoff = int64(hdr.Phoff) + phentsize = int(hdr.Phentsize) + phnum = int(hdr.Phnum) + shoff = int64(hdr.Shoff) + shentsize = int(hdr.Shentsize) + shnum = int(hdr.Shnum) + shstrndx = int(hdr.Shstrndx) + case ELFCLASS64: + hdr := new(Header64) + sr.Seek(0, seekStart) + if err := binary.Read(sr, f.ByteOrder, hdr); err != nil { + return nil, err + } + f.Type = Type(hdr.Type) + f.Machine = Machine(hdr.Machine) + f.Entry = hdr.Entry + if v := Version(hdr.Version); v != f.Version { + return nil, &FormatError{0, "mismatched ELF version", v} + } + phoff = int64(hdr.Phoff) + phentsize = int(hdr.Phentsize) + phnum = int(hdr.Phnum) + shoff = int64(hdr.Shoff) + shentsize = int(hdr.Shentsize) + shnum = int(hdr.Shnum) + shstrndx = int(hdr.Shstrndx) + } + + if shoff < 0 { + return nil, &FormatError{0, "invalid shoff", shoff} + } + if phoff < 0 { + return nil, &FormatError{0, "invalid phoff", phoff} + } + + if shoff == 0 && shnum != 0 { + return nil, &FormatError{0, "invalid ELF shnum for shoff=0", shnum} + } + + if shnum > 0 && shstrndx >= shnum { + return nil, &FormatError{0, "invalid ELF shstrndx", shstrndx} + } + + var wantPhentsize, wantShentsize int + switch f.Class { + case ELFCLASS32: + wantPhentsize = 8 * 4 + wantShentsize = 10 * 4 + case ELFCLASS64: + wantPhentsize = 2*4 + 6*8 + wantShentsize = 4*4 + 6*8 + } + if phnum > 0 && phentsize < wantPhentsize { + return nil, &FormatError{0, "invalid ELF phentsize", phentsize} + } + + // Read program headers + f.Progs = make([]*Prog, phnum) + for i := 0; i < phnum; i++ { + off := phoff + int64(i)*int64(phentsize) + sr.Seek(off, seekStart) + p := new(Prog) + switch f.Class { + case ELFCLASS32: + ph := new(Prog32) + if err := binary.Read(sr, f.ByteOrder, ph); err != nil { + return nil, err + } + p.ProgHeader = ProgHeader{ + Type: ProgType(ph.Type), + Flags: ProgFlag(ph.Flags), + Off: uint64(ph.Off), + Vaddr: uint64(ph.Vaddr), + Paddr: uint64(ph.Paddr), + Filesz: uint64(ph.Filesz), + Memsz: uint64(ph.Memsz), + Align: uint64(ph.Align), + } + case ELFCLASS64: + ph := new(Prog64) + if err := binary.Read(sr, f.ByteOrder, ph); err != nil { + return nil, err + } + p.ProgHeader = ProgHeader{ + Type: ProgType(ph.Type), + Flags: ProgFlag(ph.Flags), + Off: ph.Off, + Vaddr: ph.Vaddr, + Paddr: ph.Paddr, + Filesz: ph.Filesz, + Memsz: ph.Memsz, + Align: ph.Align, + } + } + if int64(p.Off) < 0 { + return nil, &FormatError{off, "invalid program header offset", p.Off} + } + if int64(p.Filesz) < 0 { + return nil, &FormatError{off, "invalid program header file size", p.Filesz} + } + p.sr = io.NewSectionReader(r, int64(p.Off), int64(p.Filesz)) + p.ReaderAt = p.sr + f.Progs[i] = p + } + + // If the number of sections is greater than or equal to SHN_LORESERVE + // (0xff00), shnum has the value zero and the actual number of section + // header table entries is contained in the sh_size field of the section + // header at index 0. + if shoff > 0 && shnum == 0 { + var typ, link uint32 + sr.Seek(shoff, seekStart) + switch f.Class { + case ELFCLASS32: + sh := new(Section32) + if err := binary.Read(sr, f.ByteOrder, sh); err != nil { + return nil, err + } + shnum = int(sh.Size) + typ = sh.Type + link = sh.Link + case ELFCLASS64: + sh := new(Section64) + if err := binary.Read(sr, f.ByteOrder, sh); err != nil { + return nil, err + } + shnum = int(sh.Size) + typ = sh.Type + link = sh.Link + } + if SectionType(typ) != SHT_NULL { + return nil, &FormatError{shoff, "invalid type of the initial section", SectionType(typ)} + } + + if shnum < int(SHN_LORESERVE) { + return nil, &FormatError{shoff, "invalid ELF shnum contained in sh_size", shnum} + } + + // If the section name string table section index is greater than or + // equal to SHN_LORESERVE (0xff00), this member has the value + // SHN_XINDEX (0xffff) and the actual index of the section name + // string table section is contained in the sh_link field of the + // section header at index 0. + if shstrndx == int(SHN_XINDEX) { + shstrndx = int(link) + if shstrndx < int(SHN_LORESERVE) { + return nil, &FormatError{shoff, "invalid ELF shstrndx contained in sh_link", shstrndx} + } + } + } + + if shnum > 0 && shentsize < wantShentsize { + return nil, &FormatError{0, "invalid ELF shentsize", shentsize} + } + + // Read section headers + c := saferio.SliceCap((*Section)(nil), uint64(shnum)) + if c < 0 { + return nil, &FormatError{0, "too many sections", shnum} + } + f.Sections = make([]*Section, 0, c) + names := make([]uint32, 0, c) + for i := 0; i < shnum; i++ { + off := shoff + int64(i)*int64(shentsize) + sr.Seek(off, seekStart) + s := new(Section) + switch f.Class { + case ELFCLASS32: + sh := new(Section32) + if err := binary.Read(sr, f.ByteOrder, sh); err != nil { + return nil, err + } + names = append(names, sh.Name) + s.SectionHeader = SectionHeader{ + Type: SectionType(sh.Type), + Flags: SectionFlag(sh.Flags), + Addr: uint64(sh.Addr), + Offset: uint64(sh.Off), + FileSize: uint64(sh.Size), + Link: sh.Link, + Info: sh.Info, + Addralign: uint64(sh.Addralign), + Entsize: uint64(sh.Entsize), + } + case ELFCLASS64: + sh := new(Section64) + if err := binary.Read(sr, f.ByteOrder, sh); err != nil { + return nil, err + } + names = append(names, sh.Name) + s.SectionHeader = SectionHeader{ + Type: SectionType(sh.Type), + Flags: SectionFlag(sh.Flags), + Offset: sh.Off, + FileSize: sh.Size, + Addr: sh.Addr, + Link: sh.Link, + Info: sh.Info, + Addralign: sh.Addralign, + Entsize: sh.Entsize, + } + } + if int64(s.Offset) < 0 { + return nil, &FormatError{off, "invalid section offset", int64(s.Offset)} + } + if int64(s.FileSize) < 0 { + return nil, &FormatError{off, "invalid section size", int64(s.FileSize)} + } + s.sr = io.NewSectionReader(r, int64(s.Offset), int64(s.FileSize)) + + if s.Flags&SHF_COMPRESSED == 0 { + s.ReaderAt = s.sr + s.Size = s.FileSize + } else { + // Read the compression header. + switch f.Class { + case ELFCLASS32: + ch := new(Chdr32) + if err := binary.Read(s.sr, f.ByteOrder, ch); err != nil { + return nil, err + } + s.compressionType = CompressionType(ch.Type) + s.Size = uint64(ch.Size) + s.Addralign = uint64(ch.Addralign) + s.compressionOffset = int64(binary.Size(ch)) + case ELFCLASS64: + ch := new(Chdr64) + if err := binary.Read(s.sr, f.ByteOrder, ch); err != nil { + return nil, err + } + s.compressionType = CompressionType(ch.Type) + s.Size = ch.Size + s.Addralign = ch.Addralign + s.compressionOffset = int64(binary.Size(ch)) + } + } + + f.Sections = append(f.Sections, s) + } + + if len(f.Sections) == 0 { + return f, nil + } + + // Load section header string table. + if shstrndx == 0 { + // If the file has no section name string table, + // shstrndx holds the value SHN_UNDEF (0). + return f, nil + } + shstr := f.Sections[shstrndx] + if shstr.Type != SHT_STRTAB { + return nil, &FormatError{shoff + int64(shstrndx*shentsize), "invalid ELF section name string table type", shstr.Type} + } + shstrtab, err := shstr.Data() + if err != nil { + return nil, err + } + for i, s := range f.Sections { + var ok bool + s.Name, ok = getString(shstrtab, int(names[i])) + if !ok { + return nil, &FormatError{shoff + int64(i*shentsize), "bad section name index", names[i]} + } + } + + return f, nil +} + +// getSymbols returns a slice of Symbols from parsing the symbol table +// with the given type, along with the associated string table. +func (f *File) getSymbols(typ SectionType) ([]Symbol, []byte, error) { + switch f.Class { + case ELFCLASS64: + return f.getSymbols64(typ) + + case ELFCLASS32: + return f.getSymbols32(typ) + } + + return nil, nil, errors.New("not implemented") +} + +// ErrNoSymbols is returned by File.Symbols and File.DynamicSymbols +// if there is no such section in the File. +var ErrNoSymbols = errors.New("no symbol section") + +func (f *File) getSymbols32(typ SectionType) ([]Symbol, []byte, error) { + symtabSection := f.SectionByType(typ) + if symtabSection == nil { + return nil, nil, ErrNoSymbols + } + + data, err := symtabSection.Data() + if err != nil { + return nil, nil, fmt.Errorf("cannot load symbol section: %w", err) + } + symtab := bytes.NewReader(data) + if symtab.Len()%Sym32Size != 0 { + return nil, nil, errors.New("length of symbol section is not a multiple of SymSize") + } + + strdata, err := f.stringTable(symtabSection.Link) + if err != nil { + return nil, nil, fmt.Errorf("cannot load string table section: %w", err) + } + + // The first entry is all zeros. + var skip [Sym32Size]byte + symtab.Read(skip[:]) + + symbols := make([]Symbol, symtab.Len()/Sym32Size) + + i := 0 + var sym Sym32 + for symtab.Len() > 0 { + binary.Read(symtab, f.ByteOrder, &sym) + str, _ := getString(strdata, int(sym.Name)) + symbols[i].Name = str + symbols[i].Info = sym.Info + symbols[i].Other = sym.Other + symbols[i].Section = SectionIndex(sym.Shndx) + symbols[i].Value = uint64(sym.Value) + symbols[i].Size = uint64(sym.Size) + i++ + } + + return symbols, strdata, nil +} + +func (f *File) getSymbols64(typ SectionType) ([]Symbol, []byte, error) { + symtabSection := f.SectionByType(typ) + if symtabSection == nil { + return nil, nil, ErrNoSymbols + } + + data, err := symtabSection.Data() + if err != nil { + return nil, nil, fmt.Errorf("cannot load symbol section: %w", err) + } + symtab := bytes.NewReader(data) + if symtab.Len()%Sym64Size != 0 { + return nil, nil, errors.New("length of symbol section is not a multiple of Sym64Size") + } + + strdata, err := f.stringTable(symtabSection.Link) + if err != nil { + return nil, nil, fmt.Errorf("cannot load string table section: %w", err) + } + + // The first entry is all zeros. + var skip [Sym64Size]byte + symtab.Read(skip[:]) + + symbols := make([]Symbol, symtab.Len()/Sym64Size) + + i := 0 + var sym Sym64 + for symtab.Len() > 0 { + binary.Read(symtab, f.ByteOrder, &sym) + str, _ := getString(strdata, int(sym.Name)) + symbols[i].Name = str + symbols[i].Info = sym.Info + symbols[i].Other = sym.Other + symbols[i].Section = SectionIndex(sym.Shndx) + symbols[i].Value = sym.Value + symbols[i].Size = sym.Size + i++ + } + + return symbols, strdata, nil +} + +// getString extracts a string from an ELF string table. +func getString(section []byte, start int) (string, bool) { + if start < 0 || start >= len(section) { + return "", false + } + + for end := start; end < len(section); end++ { + if section[end] == 0 { + return string(section[start:end]), true + } + } + return "", false +} + +// Section returns a section with the given name, or nil if no such +// section exists. +func (f *File) Section(name string) *Section { + for _, s := range f.Sections { + if s.Name == name { + return s + } + } + return nil +} + +// applyRelocations applies relocations to dst. rels is a relocations section +// in REL or RELA format. +func (f *File) applyRelocations(dst []byte, rels []byte) error { + switch { + case f.Class == ELFCLASS64 && f.Machine == EM_X86_64: + return f.applyRelocationsAMD64(dst, rels) + case f.Class == ELFCLASS32 && f.Machine == EM_386: + return f.applyRelocations386(dst, rels) + case f.Class == ELFCLASS32 && f.Machine == EM_ARM: + return f.applyRelocationsARM(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_AARCH64: + return f.applyRelocationsARM64(dst, rels) + case f.Class == ELFCLASS32 && f.Machine == EM_PPC: + return f.applyRelocationsPPC(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_PPC64: + return f.applyRelocationsPPC64(dst, rels) + case f.Class == ELFCLASS32 && f.Machine == EM_MIPS: + return f.applyRelocationsMIPS(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_MIPS: + return f.applyRelocationsMIPS64(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_LOONGARCH: + return f.applyRelocationsLOONG64(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_RISCV: + return f.applyRelocationsRISCV64(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_S390: + return f.applyRelocationss390x(dst, rels) + case f.Class == ELFCLASS64 && f.Machine == EM_SPARCV9: + return f.applyRelocationsSPARC64(dst, rels) + default: + return errors.New("applyRelocations: not implemented") + } +} + +// canApplyRelocation reports whether we should try to apply a +// relocation to a DWARF data section, given a pointer to the symbol +// targeted by the relocation. +// Most relocations in DWARF data tend to be section-relative, but +// some target non-section symbols (for example, low_PC attrs on +// subprogram or compilation unit DIEs that target function symbols). +func canApplyRelocation(sym *Symbol) bool { + return sym.Section != SHN_UNDEF && sym.Section < SHN_LORESERVE +} + +func (f *File) applyRelocationsAMD64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 32 + t := R_X86_64(rela.Info & 0xffff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + // There are relocations, so this must be a normal + // object file. The code below handles only basic relocations + // of the form S + A (symbol plus addend). + + switch t { + case R_X86_64_64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_X86_64_32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocations386(dst []byte, rels []byte) error { + // 8 is the size of Rel32. + if len(rels)%8 != 0 { + return errors.New("length of relocation section is not a multiple of 8") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rel Rel32 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rel) + symNo := rel.Info >> 8 + t := R_386(rel.Info & 0xff) + + if symNo == 0 || symNo > uint32(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + + if t == R_386_32 { + if rel.Off+4 >= uint32(len(dst)) { + continue + } + val := f.ByteOrder.Uint32(dst[rel.Off : rel.Off+4]) + val += uint32(sym.Value) + f.ByteOrder.PutUint32(dst[rel.Off:rel.Off+4], val) + } + } + + return nil +} + +func (f *File) applyRelocationsARM(dst []byte, rels []byte) error { + // 8 is the size of Rel32. + if len(rels)%8 != 0 { + return errors.New("length of relocation section is not a multiple of 8") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rel Rel32 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rel) + symNo := rel.Info >> 8 + t := R_ARM(rel.Info & 0xff) + + if symNo == 0 || symNo > uint32(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + + switch t { + case R_ARM_ABS32: + if rel.Off+4 >= uint32(len(dst)) { + continue + } + val := f.ByteOrder.Uint32(dst[rel.Off : rel.Off+4]) + val += uint32(sym.Value) + f.ByteOrder.PutUint32(dst[rel.Off:rel.Off+4], val) + } + } + + return nil +} + +func (f *File) applyRelocationsARM64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 32 + t := R_AARCH64(rela.Info & 0xffff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + // There are relocations, so this must be a normal + // object file. The code below handles only basic relocations + // of the form S + A (symbol plus addend). + + switch t { + case R_AARCH64_ABS64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_AARCH64_ABS32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationsPPC(dst []byte, rels []byte) error { + // 12 is the size of Rela32. + if len(rels)%12 != 0 { + return errors.New("length of relocation section is not a multiple of 12") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela32 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 8 + t := R_PPC(rela.Info & 0xff) + + if symNo == 0 || symNo > uint32(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_PPC_ADDR32: + if rela.Off+4 >= uint32(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationsPPC64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 32 + t := R_PPC64(rela.Info & 0xffff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_PPC64_ADDR64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_PPC64_ADDR32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationsMIPS(dst []byte, rels []byte) error { + // 8 is the size of Rel32. + if len(rels)%8 != 0 { + return errors.New("length of relocation section is not a multiple of 8") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rel Rel32 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rel) + symNo := rel.Info >> 8 + t := R_MIPS(rel.Info & 0xff) + + if symNo == 0 || symNo > uint32(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + + switch t { + case R_MIPS_32: + if rel.Off+4 >= uint32(len(dst)) { + continue + } + val := f.ByteOrder.Uint32(dst[rel.Off : rel.Off+4]) + val += uint32(sym.Value) + f.ByteOrder.PutUint32(dst[rel.Off:rel.Off+4], val) + } + } + + return nil +} + +func (f *File) applyRelocationsMIPS64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + var symNo uint64 + var t R_MIPS + if f.ByteOrder == binary.BigEndian { + symNo = rela.Info >> 32 + t = R_MIPS(rela.Info & 0xff) + } else { + symNo = rela.Info & 0xffffffff + t = R_MIPS(rela.Info >> 56) + } + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_MIPS_64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_MIPS_32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationsLOONG64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + var symNo uint64 + var t R_LARCH + symNo = rela.Info >> 32 + t = R_LARCH(rela.Info & 0xffff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_LARCH_64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_LARCH_32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationsRISCV64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 32 + t := R_RISCV(rela.Info & 0xffff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_RISCV_64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_RISCV_32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationss390x(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 32 + t := R_390(rela.Info & 0xffff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_390_64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_390_32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) applyRelocationsSPARC64(dst []byte, rels []byte) error { + // 24 is the size of Rela64. + if len(rels)%24 != 0 { + return errors.New("length of relocation section is not a multiple of 24") + } + + symbols, _, err := f.getSymbols(SHT_SYMTAB) + if err != nil { + return err + } + + b := bytes.NewReader(rels) + var rela Rela64 + + for b.Len() > 0 { + binary.Read(b, f.ByteOrder, &rela) + symNo := rela.Info >> 32 + t := R_SPARC(rela.Info & 0xff) + + if symNo == 0 || symNo > uint64(len(symbols)) { + continue + } + sym := &symbols[symNo-1] + if !canApplyRelocation(sym) { + continue + } + + switch t { + case R_SPARC_64, R_SPARC_UA64: + if rela.Off+8 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val64 := sym.Value + uint64(rela.Addend) + f.ByteOrder.PutUint64(dst[rela.Off:rela.Off+8], val64) + case R_SPARC_32, R_SPARC_UA32: + if rela.Off+4 >= uint64(len(dst)) || rela.Addend < 0 { + continue + } + val32 := uint32(sym.Value) + uint32(rela.Addend) + f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], val32) + } + } + + return nil +} + +func (f *File) DWARF() (*dwarf.Data, error) { + dwarfSuffix := func(s *Section) string { + switch { + case strings.HasPrefix(s.Name, ".debug_"): + return s.Name[7:] + case strings.HasPrefix(s.Name, ".zdebug_"): + return s.Name[8:] + default: + return "" + } + + } + // sectionData gets the data for s, checks its size, and + // applies any applicable relations. + sectionData := func(i int, s *Section) ([]byte, error) { + b, err := s.Data() + if err != nil && uint64(len(b)) < s.Size { + return nil, err + } + var dlen uint64 + if len(b) >= 12 && string(b[:4]) == "ZLIB" { + dlen = binary.BigEndian.Uint64(b[4:12]) + s.compressionOffset = 12 + } + if dlen == 0 && len(b) >= 12 && s.Flags&SHF_COMPRESSED != 0 && + s.Flags&SHF_ALLOC == 0 && + f.FileHeader.ByteOrder.Uint32(b[:]) == uint32(COMPRESS_ZLIB) { + s.compressionType = COMPRESS_ZLIB + switch f.FileHeader.Class { + case ELFCLASS32: + // Chdr32.Size offset + dlen = uint64(f.FileHeader.ByteOrder.Uint32(b[4:])) + s.compressionOffset = 12 + case ELFCLASS64: + if len(b) < 24 { + return nil, errors.New("invalid compress header 64") + } + // Chdr64.Size offset + dlen = f.FileHeader.ByteOrder.Uint64(b[8:]) + s.compressionOffset = 24 + default: + return nil, fmt.Errorf("unsupported compress header:%s", f.FileHeader.Class) + } + } + if dlen > 0 { + r, err := zlib.NewReader(bytes.NewBuffer(b[s.compressionOffset:])) + if err != nil { + return nil, err + } + b, err = saferio.ReadData(r, dlen) + if err != nil { + return nil, err + } + if err := r.Close(); err != nil { + return nil, err + } + } + + if f.Type == ET_EXEC { + // Do not apply relocations to DWARF sections for ET_EXEC binaries. + // Relocations should already be applied, and .rela sections may + // contain incorrect data. + return b, nil + } + + for _, r := range f.Sections { + if r.Type != SHT_RELA && r.Type != SHT_REL { + continue + } + if int(r.Info) != i { + continue + } + rd, err := r.Data() + if err != nil { + return nil, err + } + err = f.applyRelocations(b, rd) + if err != nil { + return nil, err + } + } + return b, nil + } + + // There are many DWARf sections, but these are the ones + // the debug/dwarf package started with. + var dat = map[string][]byte{"abbrev": nil, "info": nil, "str": nil, "line": nil, "ranges": nil} + for i, s := range f.Sections { + suffix := dwarfSuffix(s) + if suffix == "" { + continue + } + if _, ok := dat[suffix]; !ok { + continue + } + b, err := sectionData(i, s) + if err != nil { + return nil, err + } + dat[suffix] = b + } + + d, err := dwarf.New(dat["abbrev"], nil, nil, dat["info"], dat["line"], nil, dat["ranges"], dat["str"]) + if err != nil { + return nil, err + } + + // Look for DWARF4 .debug_types sections and DWARF5 sections. + for i, s := range f.Sections { + suffix := dwarfSuffix(s) + if suffix == "" { + continue + } + if _, ok := dat[suffix]; ok { + // Already handled. + continue + } + + b, err := sectionData(i, s) + if err != nil { + return nil, err + } + + if suffix == "types" { + if err := d.AddTypes(fmt.Sprintf("types-%d", i), b); err != nil { + return nil, err + } + } else { + if err := d.AddSection(".debug_"+suffix, b); err != nil { + return nil, err + } + } + } + + return d, nil +} + +// Symbols returns the symbol table for f. The symbols will be listed in the order +// they appear in f. +// +// For compatibility with Go 1.0, Symbols omits the null symbol at index 0. +// After retrieving the symbols as symtab, an externally supplied index x +// corresponds to symtab[x-1], not symtab[x]. +func (f *File) Symbols() ([]Symbol, error) { + sym, _, err := f.getSymbols(SHT_SYMTAB) + return sym, err +} + +// DynamicSymbols returns the dynamic symbol table for f. The symbols +// will be listed in the order they appear in f. +// +// If f has a symbol version table, the returned Symbols will have +// initialized Version and Library fields. +// +// For compatibility with Symbols, DynamicSymbols omits the null symbol at index 0. +// After retrieving the symbols as symtab, an externally supplied index x +// corresponds to symtab[x-1], not symtab[x]. +func (f *File) DynamicSymbols() ([]Symbol, error) { + sym, str, err := f.getSymbols(SHT_DYNSYM) + if err != nil { + return nil, err + } + if f.gnuVersionInit(str) { + for i := range sym { + sym[i].Library, sym[i].Version = f.gnuVersion(i) + } + } + return sym, nil +} + +type ImportedSymbol struct { + Name string + Version string + Library string +} + +// ImportedSymbols returns the names of all symbols +// referred to by the binary f that are expected to be +// satisfied by other libraries at dynamic load time. +// It does not return weak symbols. +func (f *File) ImportedSymbols() ([]ImportedSymbol, error) { + sym, str, err := f.getSymbols(SHT_DYNSYM) + if err != nil { + return nil, err + } + f.gnuVersionInit(str) + var all []ImportedSymbol + for i, s := range sym { + if ST_BIND(s.Info) == STB_GLOBAL && s.Section == SHN_UNDEF { + all = append(all, ImportedSymbol{Name: s.Name}) + sym := &all[len(all)-1] + sym.Library, sym.Version = f.gnuVersion(i) + } + } + return all, nil +} + +type verneed struct { + File string + Name string +} + +// gnuVersionInit parses the GNU version tables +// for use by calls to gnuVersion. +func (f *File) gnuVersionInit(str []byte) bool { + if f.gnuNeed != nil { + // Already initialized + return true + } + + // Accumulate verneed information. + vn := f.SectionByType(SHT_GNU_VERNEED) + if vn == nil { + return false + } + d, _ := vn.Data() + + var need []verneed + i := 0 + for { + if i+16 > len(d) { + break + } + vers := f.ByteOrder.Uint16(d[i : i+2]) + if vers != 1 { + break + } + cnt := f.ByteOrder.Uint16(d[i+2 : i+4]) + fileoff := f.ByteOrder.Uint32(d[i+4 : i+8]) + aux := f.ByteOrder.Uint32(d[i+8 : i+12]) + next := f.ByteOrder.Uint32(d[i+12 : i+16]) + file, _ := getString(str, int(fileoff)) + + var name string + j := i + int(aux) + for c := 0; c < int(cnt); c++ { + if j+16 > len(d) { + break + } + // hash := f.ByteOrder.Uint32(d[j:j+4]) + // flags := f.ByteOrder.Uint16(d[j+4:j+6]) + other := f.ByteOrder.Uint16(d[j+6 : j+8]) + nameoff := f.ByteOrder.Uint32(d[j+8 : j+12]) + next := f.ByteOrder.Uint32(d[j+12 : j+16]) + name, _ = getString(str, int(nameoff)) + ndx := int(other) + if ndx >= len(need) { + a := make([]verneed, 2*(ndx+1)) + copy(a, need) + need = a + } + + need[ndx] = verneed{file, name} + if next == 0 { + break + } + j += int(next) + } + + if next == 0 { + break + } + i += int(next) + } + + // Versym parallels symbol table, indexing into verneed. + vs := f.SectionByType(SHT_GNU_VERSYM) + if vs == nil { + return false + } + d, _ = vs.Data() + + f.gnuNeed = need + f.gnuVersym = d + return true +} + +// gnuVersion adds Library and Version information to sym, +// which came from offset i of the symbol table. +func (f *File) gnuVersion(i int) (library string, version string) { + // Each entry is two bytes; skip undef entry at beginning. + i = (i + 1) * 2 + if i >= len(f.gnuVersym) { + return + } + s := f.gnuVersym[i:] + if len(s) < 2 { + return + } + j := int(f.ByteOrder.Uint16(s)) + if j < 2 || j >= len(f.gnuNeed) { + return + } + n := &f.gnuNeed[j] + return n.File, n.Name +} + +// ImportedLibraries returns the names of all libraries +// referred to by the binary f that are expected to be +// linked with the binary at dynamic link time. +func (f *File) ImportedLibraries() ([]string, error) { + return f.DynString(DT_NEEDED) +} + +// DynString returns the strings listed for the given tag in the file's dynamic +// section. +// +// The tag must be one that takes string values: DT_NEEDED, DT_SONAME, DT_RPATH, or +// DT_RUNPATH. +func (f *File) DynString(tag DynTag) ([]string, error) { + switch tag { + case DT_NEEDED, DT_SONAME, DT_RPATH, DT_RUNPATH: + default: + return nil, fmt.Errorf("non-string-valued tag %v", tag) + } + ds := f.SectionByType(SHT_DYNAMIC) + if ds == nil { + // not dynamic, so no libraries + return nil, nil + } + d, err := ds.Data() + if err != nil { + return nil, err + } + str, err := f.stringTable(ds.Link) + if err != nil { + return nil, err + } + var all []string + for len(d) > 0 { + var t DynTag + var v uint64 + switch f.Class { + case ELFCLASS32: + t = DynTag(f.ByteOrder.Uint32(d[0:4])) + v = uint64(f.ByteOrder.Uint32(d[4:8])) + d = d[8:] + case ELFCLASS64: + t = DynTag(f.ByteOrder.Uint64(d[0:8])) + v = f.ByteOrder.Uint64(d[8:16]) + d = d[16:] + } + if t == tag { + s, ok := getString(str, int(v)) + if ok { + all = append(all, s) + } + } + } + return all, nil +} + +type nobitsSectionReader struct{} + +func (*nobitsSectionReader) ReadAt(p []byte, off int64) (n int, err error) { + return 0, errors.New("unexpected read from SHT_NOBITS section") +} diff --git a/src/debug/elf/file_test.go b/src/debug/elf/file_test.go new file mode 100644 index 0000000..282e1fc --- /dev/null +++ b/src/debug/elf/file_test.go @@ -0,0 +1,1226 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package elf + +import ( + "bytes" + "compress/gzip" + "debug/dwarf" + "encoding/binary" + "fmt" + "io" + "math/rand" + "net" + "os" + "path" + "reflect" + "runtime" + "testing" +) + +type fileTest struct { + file string + hdr FileHeader + sections []SectionHeader + progs []ProgHeader + needed []string +} + +var fileTests = []fileTest{ + { + "testdata/gcc-386-freebsd-exec", + FileHeader{ELFCLASS32, ELFDATA2LSB, EV_CURRENT, ELFOSABI_FREEBSD, 0, binary.LittleEndian, ET_EXEC, EM_386, 0x80483cc}, + []SectionHeader{ + {"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, + {".interp", SHT_PROGBITS, SHF_ALLOC, 0x80480d4, 0xd4, 0x15, 0x0, 0x0, 0x1, 0x0, 0x15}, + {".hash", SHT_HASH, SHF_ALLOC, 0x80480ec, 0xec, 0x90, 0x3, 0x0, 0x4, 0x4, 0x90}, + {".dynsym", SHT_DYNSYM, SHF_ALLOC, 0x804817c, 0x17c, 0x110, 0x4, 0x1, 0x4, 0x10, 0x110}, + {".dynstr", SHT_STRTAB, SHF_ALLOC, 0x804828c, 0x28c, 0xbb, 0x0, 0x0, 0x1, 0x0, 0xbb}, + {".rel.plt", SHT_REL, SHF_ALLOC, 0x8048348, 0x348, 0x20, 0x3, 0x7, 0x4, 0x8, 0x20}, + {".init", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x8048368, 0x368, 0x11, 0x0, 0x0, 0x4, 0x0, 0x11}, + {".plt", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x804837c, 0x37c, 0x50, 0x0, 0x0, 0x4, 0x4, 0x50}, + {".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x80483cc, 0x3cc, 0x180, 0x0, 0x0, 0x4, 0x0, 0x180}, + {".fini", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x804854c, 0x54c, 0xc, 0x0, 0x0, 0x4, 0x0, 0xc}, + {".rodata", SHT_PROGBITS, SHF_ALLOC, 0x8048558, 0x558, 0xa3, 0x0, 0x0, 0x1, 0x0, 0xa3}, + {".data", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80495fc, 0x5fc, 0xc, 0x0, 0x0, 0x4, 0x0, 0xc}, + {".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x8049608, 0x608, 0x4, 0x0, 0x0, 0x4, 0x0, 0x4}, + {".dynamic", SHT_DYNAMIC, SHF_WRITE + SHF_ALLOC, 0x804960c, 0x60c, 0x98, 0x4, 0x0, 0x4, 0x8, 0x98}, + {".ctors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496a4, 0x6a4, 0x8, 0x0, 0x0, 0x4, 0x0, 0x8}, + {".dtors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496ac, 0x6ac, 0x8, 0x0, 0x0, 0x4, 0x0, 0x8}, + {".jcr", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496b4, 0x6b4, 0x4, 0x0, 0x0, 0x4, 0x0, 0x4}, + {".got", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x80496b8, 0x6b8, 0x1c, 0x0, 0x0, 0x4, 0x4, 0x1c}, + {".bss", SHT_NOBITS, SHF_WRITE + SHF_ALLOC, 0x80496d4, 0x6d4, 0x20, 0x0, 0x0, 0x4, 0x0, 0x20}, + {".comment", SHT_PROGBITS, 0x0, 0x0, 0x6d4, 0x12d, 0x0, 0x0, 0x1, 0x0, 0x12d}, + {".debug_aranges", SHT_PROGBITS, 0x0, 0x0, 0x801, 0x20, 0x0, 0x0, 0x1, 0x0, 0x20}, + {".debug_pubnames", SHT_PROGBITS, 0x0, 0x0, 0x821, 0x1b, 0x0, 0x0, 0x1, 0x0, 0x1b}, + {".debug_info", SHT_PROGBITS, 0x0, 0x0, 0x83c, 0x11d, 0x0, 0x0, 0x1, 0x0, 0x11d}, + {".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0x959, 0x41, 0x0, 0x0, 0x1, 0x0, 0x41}, + {".debug_line", SHT_PROGBITS, 0x0, 0x0, 0x99a, 0x35, 0x0, 0x0, 0x1, 0x0, 0x35}, + {".debug_frame", SHT_PROGBITS, 0x0, 0x0, 0x9d0, 0x30, 0x0, 0x0, 0x4, 0x0, 0x30}, + {".debug_str", SHT_PROGBITS, 0x0, 0x0, 0xa00, 0xd, 0x0, 0x0, 0x1, 0x0, 0xd}, + {".shstrtab", SHT_STRTAB, 0x0, 0x0, 0xa0d, 0xf8, 0x0, 0x0, 0x1, 0x0, 0xf8}, + {".symtab", SHT_SYMTAB, 0x0, 0x0, 0xfb8, 0x4b0, 0x1d, 0x38, 0x4, 0x10, 0x4b0}, + {".strtab", SHT_STRTAB, 0x0, 0x0, 0x1468, 0x206, 0x0, 0x0, 0x1, 0x0, 0x206}, + }, + []ProgHeader{ + {PT_PHDR, PF_R + PF_X, 0x34, 0x8048034, 0x8048034, 0xa0, 0xa0, 0x4}, + {PT_INTERP, PF_R, 0xd4, 0x80480d4, 0x80480d4, 0x15, 0x15, 0x1}, + {PT_LOAD, PF_R + PF_X, 0x0, 0x8048000, 0x8048000, 0x5fb, 0x5fb, 0x1000}, + {PT_LOAD, PF_R + PF_W, 0x5fc, 0x80495fc, 0x80495fc, 0xd8, 0xf8, 0x1000}, + {PT_DYNAMIC, PF_R + PF_W, 0x60c, 0x804960c, 0x804960c, 0x98, 0x98, 0x4}, + }, + []string{"libc.so.6"}, + }, + { + "testdata/gcc-amd64-linux-exec", + FileHeader{ELFCLASS64, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0, binary.LittleEndian, ET_EXEC, EM_X86_64, 0x4003e0}, + []SectionHeader{ + {"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, + {".interp", SHT_PROGBITS, SHF_ALLOC, 0x400200, 0x200, 0x1c, 0x0, 0x0, 0x1, 0x0, 0x1c}, + {".note.ABI-tag", SHT_NOTE, SHF_ALLOC, 0x40021c, 0x21c, 0x20, 0x0, 0x0, 0x4, 0x0, 0x20}, + {".hash", SHT_HASH, SHF_ALLOC, 0x400240, 0x240, 0x24, 0x5, 0x0, 0x8, 0x4, 0x24}, + {".gnu.hash", SHT_LOOS + 268435446, SHF_ALLOC, 0x400268, 0x268, 0x1c, 0x5, 0x0, 0x8, 0x0, 0x1c}, + {".dynsym", SHT_DYNSYM, SHF_ALLOC, 0x400288, 0x288, 0x60, 0x6, 0x1, 0x8, 0x18, 0x60}, + {".dynstr", SHT_STRTAB, SHF_ALLOC, 0x4002e8, 0x2e8, 0x3d, 0x0, 0x0, 0x1, 0x0, 0x3d}, + {".gnu.version", SHT_HIOS, SHF_ALLOC, 0x400326, 0x326, 0x8, 0x5, 0x0, 0x2, 0x2, 0x8}, + {".gnu.version_r", SHT_LOOS + 268435454, SHF_ALLOC, 0x400330, 0x330, 0x20, 0x6, 0x1, 0x8, 0x0, 0x20}, + {".rela.dyn", SHT_RELA, SHF_ALLOC, 0x400350, 0x350, 0x18, 0x5, 0x0, 0x8, 0x18, 0x18}, + {".rela.plt", SHT_RELA, SHF_ALLOC, 0x400368, 0x368, 0x30, 0x5, 0xc, 0x8, 0x18, 0x30}, + {".init", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x400398, 0x398, 0x18, 0x0, 0x0, 0x4, 0x0, 0x18}, + {".plt", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x4003b0, 0x3b0, 0x30, 0x0, 0x0, 0x4, 0x10, 0x30}, + {".text", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x4003e0, 0x3e0, 0x1b4, 0x0, 0x0, 0x10, 0x0, 0x1b4}, + {".fini", SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR, 0x400594, 0x594, 0xe, 0x0, 0x0, 0x4, 0x0, 0xe}, + {".rodata", SHT_PROGBITS, SHF_ALLOC, 0x4005a4, 0x5a4, 0x11, 0x0, 0x0, 0x4, 0x0, 0x11}, + {".eh_frame_hdr", SHT_PROGBITS, SHF_ALLOC, 0x4005b8, 0x5b8, 0x24, 0x0, 0x0, 0x4, 0x0, 0x24}, + {".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x4005e0, 0x5e0, 0xa4, 0x0, 0x0, 0x8, 0x0, 0xa4}, + {".ctors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600688, 0x688, 0x10, 0x0, 0x0, 0x8, 0x0, 0x10}, + {".dtors", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600698, 0x698, 0x10, 0x0, 0x0, 0x8, 0x0, 0x10}, + {".jcr", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x6006a8, 0x6a8, 0x8, 0x0, 0x0, 0x8, 0x0, 0x8}, + {".dynamic", SHT_DYNAMIC, SHF_WRITE + SHF_ALLOC, 0x6006b0, 0x6b0, 0x1a0, 0x6, 0x0, 0x8, 0x10, 0x1a0}, + {".got", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600850, 0x850, 0x8, 0x0, 0x0, 0x8, 0x8, 0x8}, + {".got.plt", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600858, 0x858, 0x28, 0x0, 0x0, 0x8, 0x8, 0x28}, + {".data", SHT_PROGBITS, SHF_WRITE + SHF_ALLOC, 0x600880, 0x880, 0x18, 0x0, 0x0, 0x8, 0x0, 0x18}, + {".bss", SHT_NOBITS, SHF_WRITE + SHF_ALLOC, 0x600898, 0x898, 0x8, 0x0, 0x0, 0x4, 0x0, 0x8}, + {".comment", SHT_PROGBITS, 0x0, 0x0, 0x898, 0x126, 0x0, 0x0, 0x1, 0x0, 0x126}, + {".debug_aranges", SHT_PROGBITS, 0x0, 0x0, 0x9c0, 0x90, 0x0, 0x0, 0x10, 0x0, 0x90}, + {".debug_pubnames", SHT_PROGBITS, 0x0, 0x0, 0xa50, 0x25, 0x0, 0x0, 0x1, 0x0, 0x25}, + {".debug_info", SHT_PROGBITS, 0x0, 0x0, 0xa75, 0x1a7, 0x0, 0x0, 0x1, 0x0, 0x1a7}, + {".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0xc1c, 0x6f, 0x0, 0x0, 0x1, 0x0, 0x6f}, + {".debug_line", SHT_PROGBITS, 0x0, 0x0, 0xc8b, 0x13f, 0x0, 0x0, 0x1, 0x0, 0x13f}, + {".debug_str", SHT_PROGBITS, SHF_MERGE + SHF_STRINGS, 0x0, 0xdca, 0xb1, 0x0, 0x0, 0x1, 0x1, 0xb1}, + {".debug_ranges", SHT_PROGBITS, 0x0, 0x0, 0xe80, 0x90, 0x0, 0x0, 0x10, 0x0, 0x90}, + {".shstrtab", SHT_STRTAB, 0x0, 0x0, 0xf10, 0x149, 0x0, 0x0, 0x1, 0x0, 0x149}, + {".symtab", SHT_SYMTAB, 0x0, 0x0, 0x19a0, 0x6f0, 0x24, 0x39, 0x8, 0x18, 0x6f0}, + {".strtab", SHT_STRTAB, 0x0, 0x0, 0x2090, 0x1fc, 0x0, 0x0, 0x1, 0x0, 0x1fc}, + }, + []ProgHeader{ + {PT_PHDR, PF_R + PF_X, 0x40, 0x400040, 0x400040, 0x1c0, 0x1c0, 0x8}, + {PT_INTERP, PF_R, 0x200, 0x400200, 0x400200, 0x1c, 0x1c, 1}, + {PT_LOAD, PF_R + PF_X, 0x0, 0x400000, 0x400000, 0x684, 0x684, 0x200000}, + {PT_LOAD, PF_R + PF_W, 0x688, 0x600688, 0x600688, 0x210, 0x218, 0x200000}, + {PT_DYNAMIC, PF_R + PF_W, 0x6b0, 0x6006b0, 0x6006b0, 0x1a0, 0x1a0, 0x8}, + {PT_NOTE, PF_R, 0x21c, 0x40021c, 0x40021c, 0x20, 0x20, 0x4}, + {PT_LOOS + 0x474E550, PF_R, 0x5b8, 0x4005b8, 0x4005b8, 0x24, 0x24, 0x4}, + {PT_LOOS + 0x474E551, PF_R + PF_W, 0x0, 0x0, 0x0, 0x0, 0x0, 0x8}, + }, + []string{"libc.so.6"}, + }, + { + "testdata/hello-world-core.gz", + FileHeader{ELFCLASS64, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0x0, binary.LittleEndian, ET_CORE, EM_X86_64, 0x0}, + []SectionHeader{}, + []ProgHeader{ + {Type: PT_NOTE, Flags: 0x0, Off: 0x3f8, Vaddr: 0x0, Paddr: 0x0, Filesz: 0x8ac, Memsz: 0x0, Align: 0x0}, + {Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x1000, Vaddr: 0x400000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_R, Off: 0x1000, Vaddr: 0x401000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x2000, Vaddr: 0x402000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x3000, Vaddr: 0x7f54078b8000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1b5000, Align: 0x1000}, + {Type: PT_LOAD, Flags: 0x0, Off: 0x3000, Vaddr: 0x7f5407a6d000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x1ff000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_R, Off: 0x3000, Vaddr: 0x7f5407c6c000, Paddr: 0x0, Filesz: 0x4000, Memsz: 0x4000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x7000, Vaddr: 0x7f5407c70000, Paddr: 0x0, Filesz: 0x2000, Memsz: 0x2000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x9000, Vaddr: 0x7f5407c72000, Paddr: 0x0, Filesz: 0x5000, Memsz: 0x5000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0xe000, Vaddr: 0x7f5407c77000, Paddr: 0x0, Filesz: 0x0, Memsz: 0x22000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0xe000, Vaddr: 0x7f5407e81000, Paddr: 0x0, Filesz: 0x3000, Memsz: 0x3000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x11000, Vaddr: 0x7f5407e96000, Paddr: 0x0, Filesz: 0x3000, Memsz: 0x3000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_R, Off: 0x14000, Vaddr: 0x7f5407e99000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x15000, Vaddr: 0x7f5407e9a000, Paddr: 0x0, Filesz: 0x2000, Memsz: 0x2000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_W + PF_R, Off: 0x17000, Vaddr: 0x7fff79972000, Paddr: 0x0, Filesz: 0x23000, Memsz: 0x23000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x3a000, Vaddr: 0x7fff799f8000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000}, + {Type: PT_LOAD, Flags: PF_X + PF_R, Off: 0x3b000, Vaddr: 0xffffffffff600000, Paddr: 0x0, Filesz: 0x1000, Memsz: 0x1000, Align: 0x1000}, + }, + nil, + }, + { + "testdata/compressed-32.obj", + FileHeader{ELFCLASS32, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0x0, binary.LittleEndian, ET_REL, EM_386, 0x0}, + []SectionHeader{ + {"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, + {".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR, 0x0, 0x34, 0x17, 0x0, 0x0, 0x1, 0x0, 0x17}, + {".rel.text", SHT_REL, SHF_INFO_LINK, 0x0, 0x3dc, 0x10, 0x13, 0x1, 0x4, 0x8, 0x10}, + {".data", SHT_PROGBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x4b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0}, + {".bss", SHT_NOBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x4b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0}, + {".rodata", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x4b, 0xd, 0x0, 0x0, 0x1, 0x0, 0xd}, + {".debug_info", SHT_PROGBITS, SHF_COMPRESSED, 0x0, 0x58, 0xb4, 0x0, 0x0, 0x1, 0x0, 0x84}, + {".rel.debug_info", SHT_REL, SHF_INFO_LINK, 0x0, 0x3ec, 0xa0, 0x13, 0x6, 0x4, 0x8, 0xa0}, + {".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0xdc, 0x5a, 0x0, 0x0, 0x1, 0x0, 0x5a}, + {".debug_aranges", SHT_PROGBITS, 0x0, 0x0, 0x136, 0x20, 0x0, 0x0, 0x1, 0x0, 0x20}, + {".rel.debug_aranges", SHT_REL, SHF_INFO_LINK, 0x0, 0x48c, 0x10, 0x13, 0x9, 0x4, 0x8, 0x10}, + {".debug_line", SHT_PROGBITS, 0x0, 0x0, 0x156, 0x5c, 0x0, 0x0, 0x1, 0x0, 0x5c}, + {".rel.debug_line", SHT_REL, SHF_INFO_LINK, 0x0, 0x49c, 0x8, 0x13, 0xb, 0x4, 0x8, 0x8}, + {".debug_str", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS | SHF_COMPRESSED, 0x0, 0x1b2, 0x10f, 0x0, 0x0, 0x1, 0x1, 0xb3}, + {".comment", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS, 0x0, 0x265, 0x2a, 0x0, 0x0, 0x1, 0x1, 0x2a}, + {".note.GNU-stack", SHT_PROGBITS, 0x0, 0x0, 0x28f, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0}, + {".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x290, 0x38, 0x0, 0x0, 0x4, 0x0, 0x38}, + {".rel.eh_frame", SHT_REL, SHF_INFO_LINK, 0x0, 0x4a4, 0x8, 0x13, 0x10, 0x4, 0x8, 0x8}, + {".shstrtab", SHT_STRTAB, 0x0, 0x0, 0x4ac, 0xab, 0x0, 0x0, 0x1, 0x0, 0xab}, + {".symtab", SHT_SYMTAB, 0x0, 0x0, 0x2c8, 0x100, 0x14, 0xe, 0x4, 0x10, 0x100}, + {".strtab", SHT_STRTAB, 0x0, 0x0, 0x3c8, 0x13, 0x0, 0x0, 0x1, 0x0, 0x13}, + }, + []ProgHeader{}, + nil, + }, + { + "testdata/compressed-64.obj", + FileHeader{ELFCLASS64, ELFDATA2LSB, EV_CURRENT, ELFOSABI_NONE, 0x0, binary.LittleEndian, ET_REL, EM_X86_64, 0x0}, + []SectionHeader{ + {"", SHT_NULL, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, + {".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR, 0x0, 0x40, 0x1b, 0x0, 0x0, 0x1, 0x0, 0x1b}, + {".rela.text", SHT_RELA, SHF_INFO_LINK, 0x0, 0x488, 0x30, 0x13, 0x1, 0x8, 0x18, 0x30}, + {".data", SHT_PROGBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x5b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0}, + {".bss", SHT_NOBITS, SHF_WRITE | SHF_ALLOC, 0x0, 0x5b, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0}, + {".rodata", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x5b, 0xd, 0x0, 0x0, 0x1, 0x0, 0xd}, + {".debug_info", SHT_PROGBITS, SHF_COMPRESSED, 0x0, 0x68, 0xba, 0x0, 0x0, 0x1, 0x0, 0x72}, + {".rela.debug_info", SHT_RELA, SHF_INFO_LINK, 0x0, 0x4b8, 0x1c8, 0x13, 0x6, 0x8, 0x18, 0x1c8}, + {".debug_abbrev", SHT_PROGBITS, 0x0, 0x0, 0xda, 0x5c, 0x0, 0x0, 0x1, 0x0, 0x5c}, + {".debug_aranges", SHT_PROGBITS, SHF_COMPRESSED, 0x0, 0x136, 0x30, 0x0, 0x0, 0x1, 0x0, 0x2f}, + {".rela.debug_aranges", SHT_RELA, SHF_INFO_LINK, 0x0, 0x680, 0x30, 0x13, 0x9, 0x8, 0x18, 0x30}, + {".debug_line", SHT_PROGBITS, 0x0, 0x0, 0x165, 0x60, 0x0, 0x0, 0x1, 0x0, 0x60}, + {".rela.debug_line", SHT_RELA, SHF_INFO_LINK, 0x0, 0x6b0, 0x18, 0x13, 0xb, 0x8, 0x18, 0x18}, + {".debug_str", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS | SHF_COMPRESSED, 0x0, 0x1c5, 0x104, 0x0, 0x0, 0x1, 0x1, 0xc3}, + {".comment", SHT_PROGBITS, SHF_MERGE | SHF_STRINGS, 0x0, 0x288, 0x2a, 0x0, 0x0, 0x1, 0x1, 0x2a}, + {".note.GNU-stack", SHT_PROGBITS, 0x0, 0x0, 0x2b2, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0}, + {".eh_frame", SHT_PROGBITS, SHF_ALLOC, 0x0, 0x2b8, 0x38, 0x0, 0x0, 0x8, 0x0, 0x38}, + {".rela.eh_frame", SHT_RELA, SHF_INFO_LINK, 0x0, 0x6c8, 0x18, 0x13, 0x10, 0x8, 0x18, 0x18}, + {".shstrtab", SHT_STRTAB, 0x0, 0x0, 0x6e0, 0xb0, 0x0, 0x0, 0x1, 0x0, 0xb0}, + {".symtab", SHT_SYMTAB, 0x0, 0x0, 0x2f0, 0x180, 0x14, 0xe, 0x8, 0x18, 0x180}, + {".strtab", SHT_STRTAB, 0x0, 0x0, 0x470, 0x13, 0x0, 0x0, 0x1, 0x0, 0x13}, + }, + []ProgHeader{}, + nil, + }, +} + +func TestOpen(t *testing.T) { + for i := range fileTests { + tt := &fileTests[i] + + var f *File + var err error + if path.Ext(tt.file) == ".gz" { + var r io.ReaderAt + if r, err = decompress(tt.file); err == nil { + f, err = NewFile(r) + } + } else { + f, err = Open(tt.file) + } + if err != nil { + t.Errorf("cannot open file %s: %v", tt.file, err) + continue + } + defer f.Close() + if f.FileHeader != tt.hdr { + t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr) + continue + } + for i, s := range f.Sections { + if i >= len(tt.sections) { + break + } + sh := tt.sections[i] + if s.SectionHeader != sh { + t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, s.SectionHeader, sh) + } + } + for i, p := range f.Progs { + if i >= len(tt.progs) { + break + } + ph := tt.progs[i] + if p.ProgHeader != ph { + t.Errorf("open %s, program %d:\n\thave %#v\n\twant %#v\n", tt.file, i, p.ProgHeader, ph) + } + } + tn := len(tt.sections) + fn := len(f.Sections) + if tn != fn { + t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn) + } + tn = len(tt.progs) + fn = len(f.Progs) + if tn != fn { + t.Errorf("open %s: len(Progs) = %d, want %d", tt.file, fn, tn) + } + tl := tt.needed + fl, err := f.ImportedLibraries() + if err != nil { + t.Error(err) + } + if !reflect.DeepEqual(tl, fl) { + t.Errorf("open %s: DT_NEEDED = %v, want %v", tt.file, tl, fl) + } + } +} + +// elf.NewFile requires io.ReaderAt, which compress/gzip cannot +// provide. Decompress the file to a bytes.Reader. +func decompress(gz string) (io.ReaderAt, error) { + in, err := os.Open(gz) + if err != nil { + return nil, err + } + defer in.Close() + r, err := gzip.NewReader(in) + if err != nil { + return nil, err + } + var out bytes.Buffer + _, err = io.Copy(&out, r) + return bytes.NewReader(out.Bytes()), err +} + +type relocationTestEntry struct { + entryNumber int + entry *dwarf.Entry + pcRanges [][2]uint64 +} + +type relocationTest struct { + file string + entries []relocationTestEntry +} + +var relocationTests = []relocationTest{ + { + "testdata/go-relocation-test-gcc441-x86-64.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.4.1", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: uint64(0x6), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x6}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc441-x86.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.4.1", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "t.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: uint64(0x5), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x5}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc424-x86-64.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.2.4 (Ubuntu 4.2.4-1ubuntu4)", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test-gcc424.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: uint64(0x6), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x6}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc482-aarch64.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.8.2 -g -fstack-protector", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test-gcc482.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x24), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x24}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc492-arm.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.9.2 20141224 (prerelease) -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16 -mtls-dialect=gnu -g", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test-gcc492.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/root/go/src/debug/elf/testdata", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x28), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x28}}, + }, + }, + }, + { + "testdata/go-relocation-test-clang-arm.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "Debian clang version 3.5.0-10 (tags/RELEASE_350/final) (based on LLVM 3.5.0)", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrStmtList, Val: int64(0x0), Class: dwarf.ClassLinePtr}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x30), Class: dwarf.ClassConstant}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x30}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc5-ppc.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C11 5.0.0 20150116 (experimental) -Asystem=linux -Asystem=unix -Asystem=posix -g", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test-gcc5-ppc.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x44), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x44}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc482-ppc64le.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.8.2 -Asystem=linux -Asystem=unix -Asystem=posix -msecure-plt -mtune=power8 -mcpu=power7 -gdwarf-2 -fstack-protector", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test-gcc482-ppc64le.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: uint64(0x24), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x24}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc492-mips64.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.9.2 -meb -mabi=64 -march=mips3 -mtune=mips64 -mllsc -mno-shared -g", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x64), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x64}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc531-s390x.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C11 5.3.1 20160316 -march=zEC12 -m64 -mzarch -g -fstack-protector-strong", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x3a), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x3a}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc620-sparc64.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C11 6.2.0 20160914 -mcpu=v9 -g -fstack-protector-strong", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x2c), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x2c}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc492-mipsle.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.9.2 -mel -march=mips2 -mtune=mips32 -mllsc -mno-shared -mabi=32 -g", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x58), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x58}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc540-mips.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C11 5.4.0 20160609 -meb -mips32 -mtune=mips32r2 -mfpxx -mllsc -mno-shared -mabi=32 -g -gdwarf-2", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: uint64(0x5c), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x5c}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc493-mips64le.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C 4.9.3 -mel -mabi=64 -mllsc -mno-shared -g -fstack-protector-strong", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(1), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: int64(0x64), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x64}}, + }, + }, + }, + { + "testdata/go-relocation-test-gcc720-riscv64.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C11 7.2.0 -march=rv64imafdc -mabi=lp64d -g -gdwarf-2", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "hello.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLowpc, Val: uint64(0x0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrHighpc, Val: uint64(0x2c), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{{0x0, 0x2c}}, + }, + }, + }, + { + "testdata/go-relocation-test-clang-x86.obj", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "clang version google3-trunk (trunk r209387)", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "go-relocation-test-clang.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + }, + }, + }, + }, + }, + { + "testdata/gcc-amd64-openbsd-debug-with-rela.obj", + []relocationTestEntry{ + { + entryNumber: 203, + entry: &dwarf.Entry{ + Offset: 0xc62, + Tag: dwarf.TagMember, + Children: false, + Field: []dwarf.Field{ + {Attr: dwarf.AttrName, Val: "it_interval", Class: dwarf.ClassString}, + {Attr: dwarf.AttrDeclFile, Val: int64(7), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrDeclLine, Val: int64(236), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrType, Val: dwarf.Offset(0xb7f), Class: dwarf.ClassReference}, + {Attr: dwarf.AttrDataMemberLoc, Val: []byte{0x23, 0x0}, Class: dwarf.ClassExprLoc}, + }, + }, + }, + { + entryNumber: 204, + entry: &dwarf.Entry{ + Offset: 0xc70, + Tag: dwarf.TagMember, + Children: false, + Field: []dwarf.Field{ + {Attr: dwarf.AttrName, Val: "it_value", Class: dwarf.ClassString}, + {Attr: dwarf.AttrDeclFile, Val: int64(7), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrDeclLine, Val: int64(237), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrType, Val: dwarf.Offset(0xb7f), Class: dwarf.ClassReference}, + {Attr: dwarf.AttrDataMemberLoc, Val: []byte{0x23, 0x10}, Class: dwarf.ClassExprLoc}, + }, + }, + }, + }, + }, + { + "testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C17 9.3.0 -mtune=generic -march=x86-64 -g -fno-asynchronous-unwind-tables", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "multiple-code-sections.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrRanges, Val: int64(0), Class: dwarf.ClassRangeListPtr}, + {Attr: dwarf.AttrLowpc, Val: uint64(0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{ + {0x765, 0x777}, + {0x7e1, 0x7ec}, + }, + }, + }, + }, + { + "testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64", + []relocationTestEntry{ + { + entry: &dwarf.Entry{ + Offset: 0xb, + Tag: dwarf.TagCompileUnit, + Children: true, + Field: []dwarf.Field{ + {Attr: dwarf.AttrProducer, Val: "GNU C17 9.3.0 -mtune=generic -march=x86-64 -g -fno-asynchronous-unwind-tables", Class: dwarf.ClassString}, + {Attr: dwarf.AttrLanguage, Val: int64(12), Class: dwarf.ClassConstant}, + {Attr: dwarf.AttrName, Val: "multiple-code-sections.c", Class: dwarf.ClassString}, + {Attr: dwarf.AttrCompDir, Val: "/tmp", Class: dwarf.ClassString}, + {Attr: dwarf.AttrRanges, Val: int64(0), Class: dwarf.ClassRangeListPtr}, + {Attr: dwarf.AttrLowpc, Val: uint64(0), Class: dwarf.ClassAddress}, + {Attr: dwarf.AttrStmtList, Val: int64(0), Class: dwarf.ClassLinePtr}, + }, + }, + pcRanges: [][2]uint64{ + {0x765, 0x777}, + {0x7e1, 0x7ec}, + }, + }, + }, + }, +} + +func TestDWARFRelocations(t *testing.T) { + for _, test := range relocationTests { + test := test + t.Run(test.file, func(t *testing.T) { + t.Parallel() + f, err := Open(test.file) + if err != nil { + t.Fatal(err) + } + dwarf, err := f.DWARF() + if err != nil { + t.Fatal(err) + } + reader := dwarf.Reader() + idx := 0 + for _, testEntry := range test.entries { + if testEntry.entryNumber < idx { + t.Fatalf("internal test error: %d < %d", testEntry.entryNumber, idx) + } + for ; idx < testEntry.entryNumber; idx++ { + entry, err := reader.Next() + if entry == nil || err != nil { + t.Fatalf("Failed to skip to entry %d: %v", testEntry.entryNumber, err) + } + } + entry, err := reader.Next() + idx++ + if err != nil { + t.Fatal(err) + } + if !reflect.DeepEqual(testEntry.entry, entry) { + t.Errorf("entry %d mismatch: got:%#v want:%#v", testEntry.entryNumber, entry, testEntry.entry) + } + pcRanges, err := dwarf.Ranges(entry) + if err != nil { + t.Fatal(err) + } + if !reflect.DeepEqual(testEntry.pcRanges, pcRanges) { + t.Errorf("entry %d: PC range mismatch: got:%#v want:%#v", testEntry.entryNumber, pcRanges, testEntry.pcRanges) + } + } + }) + } +} + +func TestCompressedDWARF(t *testing.T) { + // Test file built with GCC 4.8.4 and as 2.24 using: + // gcc -Wa,--compress-debug-sections -g -c -o zdebug-test-gcc484-x86-64.obj hello.c + f, err := Open("testdata/zdebug-test-gcc484-x86-64.obj") + if err != nil { + t.Fatal(err) + } + dwarf, err := f.DWARF() + if err != nil { + t.Fatal(err) + } + reader := dwarf.Reader() + n := 0 + for { + entry, err := reader.Next() + if err != nil { + t.Fatal(err) + } + if entry == nil { + break + } + n++ + } + if n != 18 { + t.Fatalf("want %d DWARF entries, got %d", 18, n) + } +} + +func TestCompressedSection(t *testing.T) { + // Test files built with gcc -g -S hello.c and assembled with + // --compress-debug-sections=zlib-gabi. + f, err := Open("testdata/compressed-64.obj") + if err != nil { + t.Fatal(err) + } + sec := f.Section(".debug_info") + wantData := []byte{ + 182, 0, 0, 0, 4, 0, 0, 0, 0, 0, 8, 1, 0, 0, 0, 0, + 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 27, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 8, 7, + 0, 0, 0, 0, 2, 1, 8, 0, 0, 0, 0, 2, 2, 7, 0, 0, + 0, 0, 2, 4, 7, 0, 0, 0, 0, 2, 1, 6, 0, 0, 0, 0, + 2, 2, 5, 0, 0, 0, 0, 3, 4, 5, 105, 110, 116, 0, 2, 8, + 5, 0, 0, 0, 0, 2, 8, 7, 0, 0, 0, 0, 4, 8, 114, 0, + 0, 0, 2, 1, 6, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 4, + 0, 0, 0, 0, 0, 0, 0, 0, 27, 0, 0, 0, 0, 0, 0, 0, + 1, 156, 179, 0, 0, 0, 6, 0, 0, 0, 0, 1, 4, 87, 0, 0, + 0, 2, 145, 108, 6, 0, 0, 0, 0, 1, 4, 179, 0, 0, 0, 2, + 145, 96, 0, 4, 8, 108, 0, 0, 0, 0, + } + + // Test Data method. + b, err := sec.Data() + if err != nil { + t.Fatal(err) + } + if !bytes.Equal(wantData, b) { + t.Fatalf("want data %x, got %x", wantData, b) + } + + // Test Open method and seeking. + buf, have, count := make([]byte, len(b)), make([]bool, len(b)), 0 + sf := sec.Open() + if got, err := sf.Seek(0, io.SeekEnd); got != int64(len(b)) || err != nil { + t.Fatalf("want seek end %d, got %d error %v", len(b), got, err) + } + if n, err := sf.Read(buf); n != 0 || err != io.EOF { + t.Fatalf("want EOF with 0 bytes, got %v with %d bytes", err, n) + } + pos := int64(len(buf)) + for count < len(buf) { + // Construct random seek arguments. + whence := rand.Intn(3) + target := rand.Int63n(int64(len(buf))) + var offset int64 + switch whence { + case io.SeekStart: + offset = target + case io.SeekCurrent: + offset = target - pos + case io.SeekEnd: + offset = target - int64(len(buf)) + } + pos, err = sf.Seek(offset, whence) + if err != nil { + t.Fatal(err) + } + if pos != target { + t.Fatalf("want position %d, got %d", target, pos) + } + + // Read data from the new position. + end := pos + 16 + if end > int64(len(buf)) { + end = int64(len(buf)) + } + n, err := io.ReadFull(sf, buf[pos:end]) + if err != nil { + t.Fatal(err) + } + for i := 0; i < n; i++ { + if !have[pos] { + have[pos] = true + count++ + } + pos++ + } + } + if !bytes.Equal(wantData, buf) { + t.Fatalf("want data %x, got %x", wantData, buf) + } +} + +func TestNoSectionOverlaps(t *testing.T) { + // Ensure cmd/link outputs sections without overlaps. + switch runtime.GOOS { + case "aix", "android", "darwin", "ios", "js", "plan9", "windows": + t.Skipf("cmd/link doesn't produce ELF binaries on %s", runtime.GOOS) + } + _ = net.ResolveIPAddr // force dynamic linkage + f, err := Open(os.Args[0]) + if err != nil { + t.Error(err) + return + } + for i, si := range f.Sections { + sih := si.SectionHeader + if sih.Type == SHT_NOBITS { + continue + } + // checking for overlap in file + for j, sj := range f.Sections { + sjh := sj.SectionHeader + if i == j || sjh.Type == SHT_NOBITS || sih.Offset == sjh.Offset && sih.FileSize == 0 { + continue + } + if sih.Offset >= sjh.Offset && sih.Offset < sjh.Offset+sjh.FileSize { + t.Errorf("ld produced ELF with section offset %s within %s: 0x%x <= 0x%x..0x%x < 0x%x", + sih.Name, sjh.Name, sjh.Offset, sih.Offset, sih.Offset+sih.FileSize, sjh.Offset+sjh.FileSize) + } + } + + if sih.Flags&SHF_ALLOC == 0 { + continue + } + + // checking for overlap in address space + for j, sj := range f.Sections { + sjh := sj.SectionHeader + if i == j || sjh.Flags&SHF_ALLOC == 0 || sjh.Type == SHT_NOBITS || + sih.Addr == sjh.Addr && sih.Size == 0 { + continue + } + if sih.Addr >= sjh.Addr && sih.Addr < sjh.Addr+sjh.Size { + t.Errorf("ld produced ELF with section address %s within %s: 0x%x <= 0x%x..0x%x < 0x%x", + sih.Name, sjh.Name, sjh.Addr, sih.Addr, sih.Addr+sih.Size, sjh.Addr+sjh.Size) + } + } + } +} + +func TestNobitsSection(t *testing.T) { + const testdata = "testdata/gcc-amd64-linux-exec" + f, err := Open(testdata) + if err != nil { + t.Fatalf("could not read %s: %v", testdata, err) + } + defer f.Close() + + wantError := "unexpected read from SHT_NOBITS section" + bss := f.Section(".bss") + + _, err = bss.Data() + if err == nil || err.Error() != wantError { + t.Fatalf("bss.Data() got error %q, want error %q", err, wantError) + } + + r := bss.Open() + p := make([]byte, 1) + _, err = r.Read(p) + if err == nil || err.Error() != wantError { + t.Fatalf("r.Read(p) got error %q, want error %q", err, wantError) + } +} + +// TestLargeNumberOfSections tests the case that a file has greater than or +// equal to 65280 (0xff00) sections. +func TestLargeNumberOfSections(t *testing.T) { + // A file with >= 0xff00 sections is too big, so we will construct it on the + // fly. The original file "y.o" is generated by these commands: + // 1. generate "y.c": + // for i in `seq 1 65288`; do + // printf -v x "%04x" i; + // echo "int var_$x __attribute__((section(\"section_$x\"))) = $i;" + // done > y.c + // 2. compile: gcc -c y.c -m32 + // + // $readelf -h y.o + // ELF Header: + // Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 + // Class: ELF32 + // Data: 2's complement, little endian + // Version: 1 (current) + // OS/ABI: UNIX - System V + // ABI Version: 0 + // Type: REL (Relocatable file) + // Machine: Intel 80386 + // Version: 0x1 + // Entry point address: 0x0 + // Start of program headers: 0 (bytes into file) + // Start of section headers: 3003468 (bytes into file) + // Flags: 0x0 + // Size of this header: 52 (bytes) + // Size of program headers: 0 (bytes) + // Number of program headers: 0 + // Size of section headers: 40 (bytes) + // Number of section headers: 0 (65298) + // Section header string table index: 65535 (65297) + // + // $readelf -S y.o + // There are 65298 section headers, starting at offset 0x2dd44c: + // Section Headers: + // [Nr] Name Type Addr Off Size ES Flg Lk Inf Al + // [ 0] NULL 00000000 000000 00ff12 00 65297 0 0 + // [ 1] .text PROGBITS 00000000 000034 000000 00 AX 0 0 1 + // [ 2] .data PROGBITS 00000000 000034 000000 00 WA 0 0 1 + // [ 3] .bss NOBITS 00000000 000034 000000 00 WA 0 0 1 + // [ 4] section_0001 PROGBITS 00000000 000034 000004 00 WA 0 0 4 + // [ 5] section_0002 PROGBITS 00000000 000038 000004 00 WA 0 0 4 + // [ section_0003 ~ section_ff06 truncated ] + // [65290] section_ff07 PROGBITS 00000000 03fc4c 000004 00 WA 0 0 4 + // [65291] section_ff08 PROGBITS 00000000 03fc50 000004 00 WA 0 0 4 + // [65292] .comment PROGBITS 00000000 03fc54 000027 01 MS 0 0 1 + // [65293] .note.GNU-stack PROGBITS 00000000 03fc7b 000000 00 0 0 1 + // [65294] .symtab SYMTAB 00000000 03fc7c 0ff0a0 10 65296 2 4 + // [65295] .symtab_shndx SYMTAB SECTION 00000000 13ed1c 03fc28 04 65294 0 4 + // [65296] .strtab STRTAB 00000000 17e944 08f74d 00 0 0 1 + // [65297] .shstrtab STRTAB 00000000 20e091 0cf3bb 00 0 0 1 + + var buf bytes.Buffer + + { + buf.Grow(0x55AF1C) // 3003468 + 40 * 65298 + + h := Header32{ + Ident: [16]byte{0x7F, 'E', 'L', 'F', 0x01, 0x01, 0x01}, + Type: 1, + Machine: 3, + Version: 1, + Shoff: 0x2DD44C, + Ehsize: 0x34, + Shentsize: 0x28, + Shnum: 0, + Shstrndx: 0xFFFF, + } + binary.Write(&buf, binary.LittleEndian, h) + + // Zero out sections [1]~[65294]. + buf.Write(bytes.Repeat([]byte{0}, 0x13ED1C-binary.Size(h))) + + // Write section [65295]. Section [65295] are all zeros except for the + // last 48 bytes. + buf.Write(bytes.Repeat([]byte{0}, 0x03FC28-12*4)) + for i := 0; i < 12; i++ { + binary.Write(&buf, binary.LittleEndian, uint32(0xFF00|i)) + } + + // Write section [65296]. + buf.Write([]byte{0}) + buf.Write([]byte("y.c\x00")) + for i := 1; i <= 65288; i++ { + // var_0001 ~ var_ff08 + name := fmt.Sprintf("var_%04x", i) + buf.Write([]byte(name)) + buf.Write([]byte{0}) + } + + // Write section [65297]. + buf.Write([]byte{0}) + buf.Write([]byte(".symtab\x00")) + buf.Write([]byte(".strtab\x00")) + buf.Write([]byte(".shstrtab\x00")) + buf.Write([]byte(".text\x00")) + buf.Write([]byte(".data\x00")) + buf.Write([]byte(".bss\x00")) + for i := 1; i <= 65288; i++ { + // s_0001 ~ s_ff08 + name := fmt.Sprintf("section_%04x", i) + buf.Write([]byte(name)) + buf.Write([]byte{0}) + } + buf.Write([]byte(".comment\x00")) + buf.Write([]byte(".note.GNU-stack\x00")) + buf.Write([]byte(".symtab_shndx\x00")) + + // Write section header table. + // NULL + binary.Write(&buf, binary.LittleEndian, Section32{Name: 0, Size: 0xFF12, Link: 0xFF11}) + // .text + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x1B, + Type: uint32(SHT_PROGBITS), + Flags: uint32(uint32(SHF_ALLOC | SHF_EXECINSTR)), + Off: 0x34, + Addralign: 0x01, + }) + // .data + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x21, + Type: uint32(SHT_PROGBITS), + Flags: uint32(SHF_WRITE | SHF_ALLOC), + Off: 0x34, + Addralign: 0x01, + }) + // .bss + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x27, + Type: uint32(SHT_NOBITS), + Flags: uint32(SHF_WRITE | SHF_ALLOC), + Off: 0x34, + Addralign: 0x01, + }) + // s_1 ~ s_65537 + for i := 0; i < 65288; i++ { + s := Section32{ + Name: uint32(0x2C + i*13), + Type: uint32(SHT_PROGBITS), + Flags: uint32(SHF_WRITE | SHF_ALLOC), + Off: uint32(0x34 + i*4), + Size: 0x04, + Addralign: 0x04, + } + binary.Write(&buf, binary.LittleEndian, s) + } + // .comment + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x0CF394, + Type: uint32(SHT_PROGBITS), + Flags: uint32(SHF_MERGE | SHF_STRINGS), + Off: 0x03FC54, + Size: 0x27, + Addralign: 0x01, + Entsize: 0x01, + }) + // .note.GNU-stack + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x0CF39D, + Type: uint32(SHT_PROGBITS), + Off: 0x03FC7B, + Addralign: 0x01, + }) + // .symtab + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x01, + Type: uint32(SHT_SYMTAB), + Off: 0x03FC7C, + Size: 0x0FF0A0, + Link: 0xFF10, + Info: 0x02, + Addralign: 0x04, + Entsize: 0x10, + }) + // .symtab_shndx + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x0CF3AD, + Type: uint32(SHT_SYMTAB_SHNDX), + Off: 0x13ED1C, + Size: 0x03FC28, + Link: 0xFF0E, + Addralign: 0x04, + Entsize: 0x04, + }) + // .strtab + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x09, + Type: uint32(SHT_STRTAB), + Off: 0x17E944, + Size: 0x08F74D, + Addralign: 0x01, + }) + // .shstrtab + binary.Write(&buf, binary.LittleEndian, Section32{ + Name: 0x11, + Type: uint32(SHT_STRTAB), + Off: 0x20E091, + Size: 0x0CF3BB, + Addralign: 0x01, + }) + } + + data := buf.Bytes() + + f, err := NewFile(bytes.NewReader(data)) + if err != nil { + t.Errorf("cannot create file from data: %v", err) + } + defer f.Close() + + wantFileHeader := FileHeader{ + Class: ELFCLASS32, + Data: ELFDATA2LSB, + Version: EV_CURRENT, + OSABI: ELFOSABI_NONE, + ByteOrder: binary.LittleEndian, + Type: ET_REL, + Machine: EM_386, + } + if f.FileHeader != wantFileHeader { + t.Errorf("\nhave %#v\nwant %#v\n", f.FileHeader, wantFileHeader) + } + + wantSectionNum := 65298 + if len(f.Sections) != wantSectionNum { + t.Errorf("len(Sections) = %d, want %d", len(f.Sections), wantSectionNum) + } + + wantSectionHeader := SectionHeader{ + Name: "section_0007", + Type: SHT_PROGBITS, + Flags: SHF_WRITE + SHF_ALLOC, + Offset: 0x4c, + Size: 0x4, + Addralign: 0x4, + FileSize: 0x4, + } + if f.Sections[10].SectionHeader != wantSectionHeader { + t.Errorf("\nhave %#v\nwant %#v\n", f.Sections[10].SectionHeader, wantSectionHeader) + } +} + +func TestIssue10996(t *testing.T) { + data := []byte("\u007fELF\x02\x01\x010000000000000" + + "\x010000000000000000000" + + "\x00\x00\x00\x00\x00\x00\x00\x0000000000\x00\x00\x00\x00" + + "0000") + _, err := NewFile(bytes.NewReader(data)) + if err == nil { + t.Fatalf("opening invalid ELF file unexpectedly succeeded") + } +} diff --git a/src/debug/elf/reader.go b/src/debug/elf/reader.go new file mode 100644 index 0000000..a458436 --- /dev/null +++ b/src/debug/elf/reader.go @@ -0,0 +1,108 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package elf + +import ( + "io" + "os" +) + +// errorReader returns error from all operations. +type errorReader struct { + error +} + +func (r errorReader) Read(p []byte) (n int, err error) { + return 0, r.error +} + +func (r errorReader) ReadAt(p []byte, off int64) (n int, err error) { + return 0, r.error +} + +func (r errorReader) Seek(offset int64, whence int) (int64, error) { + return 0, r.error +} + +func (r errorReader) Close() error { + return r.error +} + +// readSeekerFromReader converts an io.Reader into an io.ReadSeeker. +// In general Seek may not be efficient, but it is optimized for +// common cases such as seeking to the end to find the length of the +// data. +type readSeekerFromReader struct { + reset func() (io.Reader, error) + r io.Reader + size int64 + offset int64 +} + +func (r *readSeekerFromReader) start() { + x, err := r.reset() + if err != nil { + r.r = errorReader{err} + } else { + r.r = x + } + r.offset = 0 +} + +func (r *readSeekerFromReader) Read(p []byte) (n int, err error) { + if r.r == nil { + r.start() + } + n, err = r.r.Read(p) + r.offset += int64(n) + return n, err +} + +func (r *readSeekerFromReader) Seek(offset int64, whence int) (int64, error) { + var newOffset int64 + switch whence { + case seekStart: + newOffset = offset + case seekCurrent: + newOffset = r.offset + offset + case seekEnd: + newOffset = r.size + offset + default: + return 0, os.ErrInvalid + } + + switch { + case newOffset == r.offset: + return newOffset, nil + + case newOffset < 0, newOffset > r.size: + return 0, os.ErrInvalid + + case newOffset == 0: + r.r = nil + + case newOffset == r.size: + r.r = errorReader{io.EOF} + + default: + if newOffset < r.offset { + // Restart at the beginning. + r.start() + } + // Read until we reach offset. + var buf [512]byte + for r.offset < newOffset { + b := buf[:] + if newOffset-r.offset < int64(len(buf)) { + b = buf[:newOffset-r.offset] + } + if _, err := r.Read(b); err != nil { + return 0, err + } + } + } + r.offset = newOffset + return r.offset, nil +} diff --git a/src/debug/elf/symbols_test.go b/src/debug/elf/symbols_test.go new file mode 100644 index 0000000..42f0231 --- /dev/null +++ b/src/debug/elf/symbols_test.go @@ -0,0 +1,838 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package elf + +import ( + "io" + "path" + "reflect" + "testing" +) + +// TODO: remove duplicate code +func TestSymbols(t *testing.T) { + do := func(file string, ts []Symbol, getfunc func(*File) ([]Symbol, error)) { + var f *File + var err error + if path.Ext(file) == ".gz" { + var r io.ReaderAt + if r, err = decompress(file); err == nil { + f, err = NewFile(r) + } + } else { + f, err = Open(file) + } + if err != nil { + t.Errorf("TestSymbols: cannot open file %s: %v", file, err) + return + } + defer f.Close() + fs, err := getfunc(f) + if err != nil && err != ErrNoSymbols { + t.Error(err) + return + } else if err == ErrNoSymbols { + fs = []Symbol{} + } + if !reflect.DeepEqual(ts, fs) { + t.Errorf("%s: Symbols = %v, want %v", file, ts, fs) + } + } + for file, ts := range symbolsGolden { + do(file, ts, (*File).Symbols) + } + for file, ts := range dynamicSymbolsGolden { + do(file, ts, (*File).DynamicSymbols) + } +} + +// golden symbol table data generated by testdata/getgoldsym.c + +var symbolsGolden = map[string][]Symbol{ + "testdata/gcc-amd64-linux-exec": { + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1, + Value: 0x400200, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x2, + Value: 0x40021C, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x3, + Value: 0x400240, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x4, + Value: 0x400268, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x5, + Value: 0x400288, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x6, + Value: 0x4002E8, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x7, + Value: 0x400326, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x8, + Value: 0x400330, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x9, + Value: 0x400350, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xA, + Value: 0x400368, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xB, + Value: 0x400398, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xC, + Value: 0x4003B0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xD, + Value: 0x4003E0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xE, + Value: 0x400594, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xF, + Value: 0x4005A4, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x10, + Value: 0x4005B8, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x11, + Value: 0x4005E0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x12, + Value: 0x600688, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x13, + Value: 0x600698, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x14, + Value: 0x6006A8, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x15, + Value: 0x6006B0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x16, + Value: 0x600850, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x17, + Value: 0x600858, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x18, + Value: 0x600880, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x19, + Value: 0x600898, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1A, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1B, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1C, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1D, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1E, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1F, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x20, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x21, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "init.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "initfini.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "call_gmon_start", + Info: 0x2, + Other: 0x0, + Section: 0xD, + Value: 0x40040C, + Size: 0x0, + }, + Symbol{ + Name: "crtstuff.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "__CTOR_LIST__", + Info: 0x1, + Other: 0x0, + Section: 0x12, + Value: 0x600688, + Size: 0x0, + }, + Symbol{ + Name: "__DTOR_LIST__", + Info: 0x1, + Other: 0x0, + Section: 0x13, + Value: 0x600698, + Size: 0x0, + }, + Symbol{ + Name: "__JCR_LIST__", + Info: 0x1, + Other: 0x0, + Section: 0x14, + Value: 0x6006A8, + Size: 0x0, + }, + Symbol{ + Name: "__do_global_dtors_aux", + Info: 0x2, + Other: 0x0, + Section: 0xD, + Value: 0x400430, + Size: 0x0, + }, + Symbol{ + Name: "completed.6183", + Info: 0x1, + Other: 0x0, + Section: 0x19, + Value: 0x600898, + Size: 0x1, + }, + Symbol{ + Name: "p.6181", + Info: 0x1, + Other: 0x0, + Section: 0x18, + Value: 0x600890, + Size: 0x0, + }, + Symbol{ + Name: "frame_dummy", + Info: 0x2, + Other: 0x0, + Section: 0xD, + Value: 0x400470, + Size: 0x0, + }, + Symbol{ + Name: "crtstuff.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "__CTOR_END__", + Info: 0x1, + Other: 0x0, + Section: 0x12, + Value: 0x600690, + Size: 0x0, + }, + Symbol{ + Name: "__DTOR_END__", + Info: 0x1, + Other: 0x0, + Section: 0x13, + Value: 0x6006A0, + Size: 0x0, + }, + Symbol{ + Name: "__FRAME_END__", + Info: 0x1, + Other: 0x0, + Section: 0x11, + Value: 0x400680, + Size: 0x0, + }, + Symbol{ + Name: "__JCR_END__", + Info: 0x1, + Other: 0x0, + Section: 0x14, + Value: 0x6006A8, + Size: 0x0, + }, + Symbol{ + Name: "__do_global_ctors_aux", + Info: 0x2, + Other: 0x0, + Section: 0xD, + Value: 0x400560, + Size: 0x0, + }, + Symbol{ + Name: "initfini.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "hello.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "_GLOBAL_OFFSET_TABLE_", + Info: 0x1, + Other: 0x2, + Section: 0x17, + Value: 0x600858, + Size: 0x0, + }, + Symbol{ + Name: "__init_array_end", + Info: 0x0, + Other: 0x2, + Section: 0x12, + Value: 0x600684, + Size: 0x0, + }, + Symbol{ + Name: "__init_array_start", + Info: 0x0, + Other: 0x2, + Section: 0x12, + Value: 0x600684, + Size: 0x0, + }, + Symbol{ + Name: "_DYNAMIC", + Info: 0x1, + Other: 0x2, + Section: 0x15, + Value: 0x6006B0, + Size: 0x0, + }, + Symbol{ + Name: "data_start", + Info: 0x20, + Other: 0x0, + Section: 0x18, + Value: 0x600880, + Size: 0x0, + }, + Symbol{ + Name: "__libc_csu_fini", + Info: 0x12, + Other: 0x0, + Section: 0xD, + Value: 0x4004C0, + Size: 0x2, + }, + Symbol{ + Name: "_start", + Info: 0x12, + Other: 0x0, + Section: 0xD, + Value: 0x4003E0, + Size: 0x0, + }, + Symbol{ + Name: "__gmon_start__", + Info: 0x20, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "_Jv_RegisterClasses", + Info: 0x20, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "puts@@GLIBC_2.2.5", + Info: 0x12, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x18C, + }, + Symbol{ + Name: "_fini", + Info: 0x12, + Other: 0x0, + Section: 0xE, + Value: 0x400594, + Size: 0x0, + }, + Symbol{ + Name: "__libc_start_main@@GLIBC_2.2.5", + Info: 0x12, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x1C2, + }, + Symbol{ + Name: "_IO_stdin_used", + Info: 0x11, + Other: 0x0, + Section: 0xF, + Value: 0x4005A4, + Size: 0x4, + }, + Symbol{ + Name: "__data_start", + Info: 0x10, + Other: 0x0, + Section: 0x18, + Value: 0x600880, + Size: 0x0, + }, + Symbol{ + Name: "__dso_handle", + Info: 0x11, + Other: 0x2, + Section: 0x18, + Value: 0x600888, + Size: 0x0, + }, + Symbol{ + Name: "__libc_csu_init", + Info: 0x12, + Other: 0x0, + Section: 0xD, + Value: 0x4004D0, + Size: 0x89, + }, + Symbol{ + Name: "__bss_start", + Info: 0x10, + Other: 0x0, + Section: 0xFFF1, + Value: 0x600898, + Size: 0x0, + }, + Symbol{ + Name: "_end", + Info: 0x10, + Other: 0x0, + Section: 0xFFF1, + Value: 0x6008A0, + Size: 0x0, + }, + Symbol{ + Name: "_edata", + Info: 0x10, + Other: 0x0, + Section: 0xFFF1, + Value: 0x600898, + Size: 0x0, + }, + Symbol{ + Name: "main", + Info: 0x12, + Other: 0x0, + Section: 0xD, + Value: 0x400498, + Size: 0x1B, + }, + Symbol{ + Name: "_init", + Info: 0x12, + Other: 0x0, + Section: 0xB, + Value: 0x400398, + Size: 0x0, + }, + }, + "testdata/go-relocation-test-clang-x86.obj": { + Symbol{ + Name: "go-relocation-test-clang.c", + Info: 0x4, + Other: 0x0, + Section: 0xFFF1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: ".Linfo_string0", + Info: 0x0, + Other: 0x0, + Section: 0xC, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: ".Linfo_string1", + Info: 0x0, + Other: 0x0, + Section: 0xC, + Value: 0x2C, + Size: 0x0, + }, + Symbol{ + Name: ".Linfo_string2", + Info: 0x0, + Other: 0x0, + Section: 0xC, + Value: 0x47, + Size: 0x0, + }, + Symbol{ + Name: ".Linfo_string3", + Info: 0x0, + Other: 0x0, + Section: 0xC, + Value: 0x4C, + Size: 0x0, + }, + Symbol{ + Name: ".Linfo_string4", + Info: 0x0, + Other: 0x0, + Section: 0xC, + Value: 0x4E, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x1, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x2, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x3, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x4, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x6, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x7, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x8, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xA, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xC, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xD, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xE, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0xF, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "", + Info: 0x3, + Other: 0x0, + Section: 0x10, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "v", + Info: 0x11, + Other: 0x0, + Section: 0xFFF2, + Value: 0x4, + Size: 0x4, + }, + }, + "testdata/hello-world-core.gz": {}, +} + +var dynamicSymbolsGolden = map[string][]Symbol{ + "testdata/gcc-amd64-linux-exec": { + Symbol{ + Name: "__gmon_start__", + Info: 0x20, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x0, + }, + Symbol{ + Name: "puts", + Info: 0x12, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x18C, + Version: "GLIBC_2.2.5", + Library: "libc.so.6", + }, + Symbol{ + Name: "__libc_start_main", + Info: 0x12, + Other: 0x0, + Section: 0x0, + Value: 0x0, + Size: 0x1C2, + Version: "GLIBC_2.2.5", + Library: "libc.so.6", + }, + }, + "testdata/go-relocation-test-clang-x86.obj": {}, + "testdata/hello-world-core.gz": {}, +} diff --git a/src/debug/elf/testdata/compressed-32.obj 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b/src/debug/elf/testdata/go-relocation-test-gcc540-mips.obj diff --git a/src/debug/elf/testdata/go-relocation-test-gcc620-sparc64.obj b/src/debug/elf/testdata/go-relocation-test-gcc620-sparc64.obj Binary files differnew file mode 100644 index 0000000..d65c23e --- /dev/null +++ b/src/debug/elf/testdata/go-relocation-test-gcc620-sparc64.obj diff --git a/src/debug/elf/testdata/go-relocation-test-gcc720-riscv64.obj b/src/debug/elf/testdata/go-relocation-test-gcc720-riscv64.obj Binary files differnew file mode 100644 index 0000000..91ae648 --- /dev/null +++ b/src/debug/elf/testdata/go-relocation-test-gcc720-riscv64.obj diff --git a/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64 b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64 Binary files differnew file mode 100644 index 0000000..c013f3e --- /dev/null +++ b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-no-rela-x86-64 diff --git a/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64 b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64 Binary files differnew file mode 100644 index 0000000..51e03aa --- /dev/null +++ b/src/debug/elf/testdata/go-relocation-test-gcc930-ranges-with-rela-x86-64 diff --git a/src/debug/elf/testdata/hello-world-core.gz b/src/debug/elf/testdata/hello-world-core.gz Binary files differnew file mode 100644 index 0000000..6d76ab0 --- /dev/null +++ b/src/debug/elf/testdata/hello-world-core.gz diff --git a/src/debug/elf/testdata/hello.c b/src/debug/elf/testdata/hello.c new file mode 100644 index 0000000..34d9ee7 --- /dev/null +++ b/src/debug/elf/testdata/hello.c @@ -0,0 +1,7 @@ +#include <stdio.h> + +void +main(int argc, char *argv[]) +{ + printf("hello, world\n"); +} diff --git a/src/debug/elf/testdata/multiple-code-sections.c b/src/debug/elf/testdata/multiple-code-sections.c new file mode 100644 index 0000000..03b9d53 --- /dev/null +++ b/src/debug/elf/testdata/multiple-code-sections.c @@ -0,0 +1,28 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Build with: +// gcc -g multiple-code-sections.c -Wl,--emit-relocs -Wl,--discard-none -Wl,-zmax-page-size=1 -fno-asynchronous-unwind-tables -o go-relocation-test-gcc930-ranges-with-rela-x86-64 +// gcc -g multiple-code-sections.c -Wl,-zmax-page-size=1 -fno-asynchronous-unwind-tables -o go-relocation-test-gcc930-ranges-no-rela-x86-64 +// Strip with: +// strip --only-keep-debug \ +// --remove-section=.eh_frame \ +// --remove-section=.eh_frame_hdr \ +// --remove-section=.shstrtab \ +// --remove-section=.strtab \ +// --remove-section=.symtab \ +// --remove-section=.note.gnu.build-id \ +// --remove-section=.note.ABI-tag \ +// --remove-section=.dynamic \ +// --remove-section=.gnu.hash \ +// --remove-section=.interp \ +// --remove-section=.rodata +__attribute__((section(".separate_section"))) // To get GCC to emit a DW_AT_ranges attribute for the CU. +int func(void) { + return 0; +} + +int main(int argc, char *argv[]) { + return 0; +} diff --git a/src/debug/elf/testdata/zdebug-test-gcc484-x86-64.obj b/src/debug/elf/testdata/zdebug-test-gcc484-x86-64.obj Binary files differnew file mode 100644 index 0000000..a595a01 --- /dev/null +++ b/src/debug/elf/testdata/zdebug-test-gcc484-x86-64.obj diff --git a/src/debug/gosym/pclntab.go b/src/debug/gosym/pclntab.go new file mode 100644 index 0000000..a87e6cf --- /dev/null +++ b/src/debug/gosym/pclntab.go @@ -0,0 +1,695 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* + * Line tables + */ + +package gosym + +import ( + "bytes" + "encoding/binary" + "sort" + "sync" +) + +// version of the pclntab +type version int + +const ( + verUnknown version = iota + ver11 + ver12 + ver116 + ver118 + ver120 +) + +// A LineTable is a data structure mapping program counters to line numbers. +// +// In Go 1.1 and earlier, each function (represented by a Func) had its own LineTable, +// and the line number corresponded to a numbering of all source lines in the +// program, across all files. That absolute line number would then have to be +// converted separately to a file name and line number within the file. +// +// In Go 1.2, the format of the data changed so that there is a single LineTable +// for the entire program, shared by all Funcs, and there are no absolute line +// numbers, just line numbers within specific files. +// +// For the most part, LineTable's methods should be treated as an internal +// detail of the package; callers should use the methods on Table instead. +type LineTable struct { + Data []byte + PC uint64 + Line int + + // This mutex is used to keep parsing of pclntab synchronous. + mu sync.Mutex + + // Contains the version of the pclntab section. + version version + + // Go 1.2/1.16/1.18 state + binary binary.ByteOrder + quantum uint32 + ptrsize uint32 + textStart uint64 // address of runtime.text symbol (1.18+) + funcnametab []byte + cutab []byte + funcdata []byte + functab []byte + nfunctab uint32 + filetab []byte + pctab []byte // points to the pctables. + nfiletab uint32 + funcNames map[uint32]string // cache the function names + strings map[uint32]string // interned substrings of Data, keyed by offset + // fileMap varies depending on the version of the object file. + // For ver12, it maps the name to the index in the file table. + // For ver116, it maps the name to the offset in filetab. + fileMap map[string]uint32 +} + +// NOTE(rsc): This is wrong for GOARCH=arm, which uses a quantum of 4, +// but we have no idea whether we're using arm or not. This only +// matters in the old (pre-Go 1.2) symbol table format, so it's not worth +// fixing. +const oldQuantum = 1 + +func (t *LineTable) parse(targetPC uint64, targetLine int) (b []byte, pc uint64, line int) { + // The PC/line table can be thought of as a sequence of + // <pc update>* <line update> + // batches. Each update batch results in a (pc, line) pair, + // where line applies to every PC from pc up to but not + // including the pc of the next pair. + // + // Here we process each update individually, which simplifies + // the code, but makes the corner cases more confusing. + b, pc, line = t.Data, t.PC, t.Line + for pc <= targetPC && line != targetLine && len(b) > 0 { + code := b[0] + b = b[1:] + switch { + case code == 0: + if len(b) < 4 { + b = b[0:0] + break + } + val := binary.BigEndian.Uint32(b) + b = b[4:] + line += int(val) + case code <= 64: + line += int(code) + case code <= 128: + line -= int(code - 64) + default: + pc += oldQuantum * uint64(code-128) + continue + } + pc += oldQuantum + } + return b, pc, line +} + +func (t *LineTable) slice(pc uint64) *LineTable { + data, pc, line := t.parse(pc, -1) + return &LineTable{Data: data, PC: pc, Line: line} +} + +// PCToLine returns the line number for the given program counter. +// +// Deprecated: Use Table's PCToLine method instead. +func (t *LineTable) PCToLine(pc uint64) int { + if t.isGo12() { + return t.go12PCToLine(pc) + } + _, _, line := t.parse(pc, -1) + return line +} + +// LineToPC returns the program counter for the given line number, +// considering only program counters before maxpc. +// +// Deprecated: Use Table's LineToPC method instead. +func (t *LineTable) LineToPC(line int, maxpc uint64) uint64 { + if t.isGo12() { + return 0 + } + _, pc, line1 := t.parse(maxpc, line) + if line1 != line { + return 0 + } + // Subtract quantum from PC to account for post-line increment + return pc - oldQuantum +} + +// NewLineTable returns a new PC/line table +// corresponding to the encoded data. +// Text must be the start address of the +// corresponding text segment. +func NewLineTable(data []byte, text uint64) *LineTable { + return &LineTable{Data: data, PC: text, Line: 0, funcNames: make(map[uint32]string), strings: make(map[uint32]string)} +} + +// Go 1.2 symbol table format. +// See golang.org/s/go12symtab. +// +// A general note about the methods here: rather than try to avoid +// index out of bounds errors, we trust Go to detect them, and then +// we recover from the panics and treat them as indicative of a malformed +// or incomplete table. +// +// The methods called by symtab.go, which begin with "go12" prefixes, +// are expected to have that recovery logic. + +// isGo12 reports whether this is a Go 1.2 (or later) symbol table. +func (t *LineTable) isGo12() bool { + t.parsePclnTab() + return t.version >= ver12 +} + +const ( + go12magic = 0xfffffffb + go116magic = 0xfffffffa + go118magic = 0xfffffff0 + go120magic = 0xfffffff1 +) + +// uintptr returns the pointer-sized value encoded at b. +// The pointer size is dictated by the table being read. +func (t *LineTable) uintptr(b []byte) uint64 { + if t.ptrsize == 4 { + return uint64(t.binary.Uint32(b)) + } + return t.binary.Uint64(b) +} + +// parsePclnTab parses the pclntab, setting the version. +func (t *LineTable) parsePclnTab() { + t.mu.Lock() + defer t.mu.Unlock() + if t.version != verUnknown { + return + } + + // Note that during this function, setting the version is the last thing we do. + // If we set the version too early, and parsing failed (likely as a panic on + // slice lookups), we'd have a mistaken version. + // + // Error paths through this code will default the version to 1.1. + t.version = ver11 + + if !disableRecover { + defer func() { + // If we panic parsing, assume it's a Go 1.1 pclntab. + recover() + }() + } + + // Check header: 4-byte magic, two zeros, pc quantum, pointer size. + if len(t.Data) < 16 || t.Data[4] != 0 || t.Data[5] != 0 || + (t.Data[6] != 1 && t.Data[6] != 2 && t.Data[6] != 4) || // pc quantum + (t.Data[7] != 4 && t.Data[7] != 8) { // pointer size + return + } + + var possibleVersion version + leMagic := binary.LittleEndian.Uint32(t.Data) + beMagic := binary.BigEndian.Uint32(t.Data) + switch { + case leMagic == go12magic: + t.binary, possibleVersion = binary.LittleEndian, ver12 + case beMagic == go12magic: + t.binary, possibleVersion = binary.BigEndian, ver12 + case leMagic == go116magic: + t.binary, possibleVersion = binary.LittleEndian, ver116 + case beMagic == go116magic: + t.binary, possibleVersion = binary.BigEndian, ver116 + case leMagic == go118magic: + t.binary, possibleVersion = binary.LittleEndian, ver118 + case beMagic == go118magic: + t.binary, possibleVersion = binary.BigEndian, ver118 + case leMagic == go120magic: + t.binary, possibleVersion = binary.LittleEndian, ver120 + case beMagic == go120magic: + t.binary, possibleVersion = binary.BigEndian, ver120 + default: + return + } + t.version = possibleVersion + + // quantum and ptrSize are the same between 1.2, 1.16, and 1.18 + t.quantum = uint32(t.Data[6]) + t.ptrsize = uint32(t.Data[7]) + + offset := func(word uint32) uint64 { + return t.uintptr(t.Data[8+word*t.ptrsize:]) + } + data := func(word uint32) []byte { + return t.Data[offset(word):] + } + + switch possibleVersion { + case ver118, ver120: + t.nfunctab = uint32(offset(0)) + t.nfiletab = uint32(offset(1)) + t.textStart = t.PC // use the start PC instead of reading from the table, which may be unrelocated + t.funcnametab = data(3) + t.cutab = data(4) + t.filetab = data(5) + t.pctab = data(6) + t.funcdata = data(7) + t.functab = data(7) + functabsize := (int(t.nfunctab)*2 + 1) * t.functabFieldSize() + t.functab = t.functab[:functabsize] + case ver116: + t.nfunctab = uint32(offset(0)) + t.nfiletab = uint32(offset(1)) + t.funcnametab = data(2) + t.cutab = data(3) + t.filetab = data(4) + t.pctab = data(5) + t.funcdata = data(6) + t.functab = data(6) + functabsize := (int(t.nfunctab)*2 + 1) * t.functabFieldSize() + t.functab = t.functab[:functabsize] + case ver12: + t.nfunctab = uint32(t.uintptr(t.Data[8:])) + t.funcdata = t.Data + t.funcnametab = t.Data + t.functab = t.Data[8+t.ptrsize:] + t.pctab = t.Data + functabsize := (int(t.nfunctab)*2 + 1) * t.functabFieldSize() + fileoff := t.binary.Uint32(t.functab[functabsize:]) + t.functab = t.functab[:functabsize] + t.filetab = t.Data[fileoff:] + t.nfiletab = t.binary.Uint32(t.filetab) + t.filetab = t.filetab[:t.nfiletab*4] + default: + panic("unreachable") + } +} + +// go12Funcs returns a slice of Funcs derived from the Go 1.2+ pcln table. +func (t *LineTable) go12Funcs() []Func { + // Assume it is malformed and return nil on error. + if !disableRecover { + defer func() { + recover() + }() + } + + ft := t.funcTab() + funcs := make([]Func, ft.Count()) + syms := make([]Sym, len(funcs)) + for i := range funcs { + f := &funcs[i] + f.Entry = ft.pc(i) + f.End = ft.pc(i + 1) + info := t.funcData(uint32(i)) + f.LineTable = t + f.FrameSize = int(info.deferreturn()) + syms[i] = Sym{ + Value: f.Entry, + Type: 'T', + Name: t.funcName(info.nameOff()), + GoType: 0, + Func: f, + goVersion: t.version, + } + f.Sym = &syms[i] + } + return funcs +} + +// findFunc returns the funcData corresponding to the given program counter. +func (t *LineTable) findFunc(pc uint64) funcData { + ft := t.funcTab() + if pc < ft.pc(0) || pc >= ft.pc(ft.Count()) { + return funcData{} + } + idx := sort.Search(int(t.nfunctab), func(i int) bool { + return ft.pc(i) > pc + }) + idx-- + return t.funcData(uint32(idx)) +} + +// readvarint reads, removes, and returns a varint from *pp. +func (t *LineTable) readvarint(pp *[]byte) uint32 { + var v, shift uint32 + p := *pp + for shift = 0; ; shift += 7 { + b := p[0] + p = p[1:] + v |= (uint32(b) & 0x7F) << shift + if b&0x80 == 0 { + break + } + } + *pp = p + return v +} + +// funcName returns the name of the function found at off. +func (t *LineTable) funcName(off uint32) string { + if s, ok := t.funcNames[off]; ok { + return s + } + i := bytes.IndexByte(t.funcnametab[off:], 0) + s := string(t.funcnametab[off : off+uint32(i)]) + t.funcNames[off] = s + return s +} + +// stringFrom returns a Go string found at off from a position. +func (t *LineTable) stringFrom(arr []byte, off uint32) string { + if s, ok := t.strings[off]; ok { + return s + } + i := bytes.IndexByte(arr[off:], 0) + s := string(arr[off : off+uint32(i)]) + t.strings[off] = s + return s +} + +// string returns a Go string found at off. +func (t *LineTable) string(off uint32) string { + return t.stringFrom(t.funcdata, off) +} + +// functabFieldSize returns the size in bytes of a single functab field. +func (t *LineTable) functabFieldSize() int { + if t.version >= ver118 { + return 4 + } + return int(t.ptrsize) +} + +// funcTab returns t's funcTab. +func (t *LineTable) funcTab() funcTab { + return funcTab{LineTable: t, sz: t.functabFieldSize()} +} + +// funcTab is memory corresponding to a slice of functab structs, followed by an invalid PC. +// A functab struct is a PC and a func offset. +type funcTab struct { + *LineTable + sz int // cached result of t.functabFieldSize +} + +// Count returns the number of func entries in f. +func (f funcTab) Count() int { + return int(f.nfunctab) +} + +// pc returns the PC of the i'th func in f. +func (f funcTab) pc(i int) uint64 { + u := f.uint(f.functab[2*i*f.sz:]) + if f.version >= ver118 { + u += f.textStart + } + return u +} + +// funcOff returns the funcdata offset of the i'th func in f. +func (f funcTab) funcOff(i int) uint64 { + return f.uint(f.functab[(2*i+1)*f.sz:]) +} + +// uint returns the uint stored at b. +func (f funcTab) uint(b []byte) uint64 { + if f.sz == 4 { + return uint64(f.binary.Uint32(b)) + } + return f.binary.Uint64(b) +} + +// funcData is memory corresponding to an _func struct. +type funcData struct { + t *LineTable // LineTable this data is a part of + data []byte // raw memory for the function +} + +// funcData returns the ith funcData in t.functab. +func (t *LineTable) funcData(i uint32) funcData { + data := t.funcdata[t.funcTab().funcOff(int(i)):] + return funcData{t: t, data: data} +} + +// IsZero reports whether f is the zero value. +func (f funcData) IsZero() bool { + return f.t == nil && f.data == nil +} + +// entryPC returns the func's entry PC. +func (f *funcData) entryPC() uint64 { + // In Go 1.18, the first field of _func changed + // from a uintptr entry PC to a uint32 entry offset. + if f.t.version >= ver118 { + // TODO: support multiple text sections. + // See runtime/symtab.go:(*moduledata).textAddr. + return uint64(f.t.binary.Uint32(f.data)) + f.t.textStart + } + return f.t.uintptr(f.data) +} + +func (f funcData) nameOff() uint32 { return f.field(1) } +func (f funcData) deferreturn() uint32 { return f.field(3) } +func (f funcData) pcfile() uint32 { return f.field(5) } +func (f funcData) pcln() uint32 { return f.field(6) } +func (f funcData) cuOffset() uint32 { return f.field(8) } + +// field returns the nth field of the _func struct. +// It panics if n == 0 or n > 9; for n == 0, call f.entryPC. +// Most callers should use a named field accessor (just above). +func (f funcData) field(n uint32) uint32 { + if n == 0 || n > 9 { + panic("bad funcdata field") + } + // In Go 1.18, the first field of _func changed + // from a uintptr entry PC to a uint32 entry offset. + sz0 := f.t.ptrsize + if f.t.version >= ver118 { + sz0 = 4 + } + off := sz0 + (n-1)*4 // subsequent fields are 4 bytes each + data := f.data[off:] + return f.t.binary.Uint32(data) +} + +// step advances to the next pc, value pair in the encoded table. +func (t *LineTable) step(p *[]byte, pc *uint64, val *int32, first bool) bool { + uvdelta := t.readvarint(p) + if uvdelta == 0 && !first { + return false + } + if uvdelta&1 != 0 { + uvdelta = ^(uvdelta >> 1) + } else { + uvdelta >>= 1 + } + vdelta := int32(uvdelta) + pcdelta := t.readvarint(p) * t.quantum + *pc += uint64(pcdelta) + *val += vdelta + return true +} + +// pcvalue reports the value associated with the target pc. +// off is the offset to the beginning of the pc-value table, +// and entry is the start PC for the corresponding function. +func (t *LineTable) pcvalue(off uint32, entry, targetpc uint64) int32 { + p := t.pctab[off:] + + val := int32(-1) + pc := entry + for t.step(&p, &pc, &val, pc == entry) { + if targetpc < pc { + return val + } + } + return -1 +} + +// findFileLine scans one function in the binary looking for a +// program counter in the given file on the given line. +// It does so by running the pc-value tables mapping program counter +// to file number. Since most functions come from a single file, these +// are usually short and quick to scan. If a file match is found, then the +// code goes to the expense of looking for a simultaneous line number match. +func (t *LineTable) findFileLine(entry uint64, filetab, linetab uint32, filenum, line int32, cutab []byte) uint64 { + if filetab == 0 || linetab == 0 { + return 0 + } + + fp := t.pctab[filetab:] + fl := t.pctab[linetab:] + fileVal := int32(-1) + filePC := entry + lineVal := int32(-1) + linePC := entry + fileStartPC := filePC + for t.step(&fp, &filePC, &fileVal, filePC == entry) { + fileIndex := fileVal + if t.version == ver116 || t.version == ver118 || t.version == ver120 { + fileIndex = int32(t.binary.Uint32(cutab[fileVal*4:])) + } + if fileIndex == filenum && fileStartPC < filePC { + // fileIndex is in effect starting at fileStartPC up to + // but not including filePC, and it's the file we want. + // Run the PC table looking for a matching line number + // or until we reach filePC. + lineStartPC := linePC + for linePC < filePC && t.step(&fl, &linePC, &lineVal, linePC == entry) { + // lineVal is in effect until linePC, and lineStartPC < filePC. + if lineVal == line { + if fileStartPC <= lineStartPC { + return lineStartPC + } + if fileStartPC < linePC { + return fileStartPC + } + } + lineStartPC = linePC + } + } + fileStartPC = filePC + } + return 0 +} + +// go12PCToLine maps program counter to line number for the Go 1.2+ pcln table. +func (t *LineTable) go12PCToLine(pc uint64) (line int) { + defer func() { + if !disableRecover && recover() != nil { + line = -1 + } + }() + + f := t.findFunc(pc) + if f.IsZero() { + return -1 + } + entry := f.entryPC() + linetab := f.pcln() + return int(t.pcvalue(linetab, entry, pc)) +} + +// go12PCToFile maps program counter to file name for the Go 1.2+ pcln table. +func (t *LineTable) go12PCToFile(pc uint64) (file string) { + defer func() { + if !disableRecover && recover() != nil { + file = "" + } + }() + + f := t.findFunc(pc) + if f.IsZero() { + return "" + } + entry := f.entryPC() + filetab := f.pcfile() + fno := t.pcvalue(filetab, entry, pc) + if t.version == ver12 { + if fno <= 0 { + return "" + } + return t.string(t.binary.Uint32(t.filetab[4*fno:])) + } + // Go ≥ 1.16 + if fno < 0 { // 0 is valid for ≥ 1.16 + return "" + } + cuoff := f.cuOffset() + if fnoff := t.binary.Uint32(t.cutab[(cuoff+uint32(fno))*4:]); fnoff != ^uint32(0) { + return t.stringFrom(t.filetab, fnoff) + } + return "" +} + +// go12LineToPC maps a (file, line) pair to a program counter for the Go 1.2+ pcln table. +func (t *LineTable) go12LineToPC(file string, line int) (pc uint64) { + defer func() { + if !disableRecover && recover() != nil { + pc = 0 + } + }() + + t.initFileMap() + filenum, ok := t.fileMap[file] + if !ok { + return 0 + } + + // Scan all functions. + // If this turns out to be a bottleneck, we could build a map[int32][]int32 + // mapping file number to a list of functions with code from that file. + var cutab []byte + for i := uint32(0); i < t.nfunctab; i++ { + f := t.funcData(i) + entry := f.entryPC() + filetab := f.pcfile() + linetab := f.pcln() + if t.version == ver116 || t.version == ver118 || t.version == ver120 { + if f.cuOffset() == ^uint32(0) { + // skip functions without compilation unit (not real function, or linker generated) + continue + } + cutab = t.cutab[f.cuOffset()*4:] + } + pc := t.findFileLine(entry, filetab, linetab, int32(filenum), int32(line), cutab) + if pc != 0 { + return pc + } + } + return 0 +} + +// initFileMap initializes the map from file name to file number. +func (t *LineTable) initFileMap() { + t.mu.Lock() + defer t.mu.Unlock() + + if t.fileMap != nil { + return + } + m := make(map[string]uint32) + + if t.version == ver12 { + for i := uint32(1); i < t.nfiletab; i++ { + s := t.string(t.binary.Uint32(t.filetab[4*i:])) + m[s] = i + } + } else { + var pos uint32 + for i := uint32(0); i < t.nfiletab; i++ { + s := t.stringFrom(t.filetab, pos) + m[s] = pos + pos += uint32(len(s) + 1) + } + } + t.fileMap = m +} + +// go12MapFiles adds to m a key for every file in the Go 1.2 LineTable. +// Every key maps to obj. That's not a very interesting map, but it provides +// a way for callers to obtain the list of files in the program. +func (t *LineTable) go12MapFiles(m map[string]*Obj, obj *Obj) { + if !disableRecover { + defer func() { + recover() + }() + } + + t.initFileMap() + for file := range t.fileMap { + m[file] = obj + } +} + +// disableRecover causes this package not to swallow panics. +// This is useful when making changes. +const disableRecover = false diff --git a/src/debug/gosym/pclntab_test.go b/src/debug/gosym/pclntab_test.go new file mode 100644 index 0000000..e380bb5 --- /dev/null +++ b/src/debug/gosym/pclntab_test.go @@ -0,0 +1,407 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package gosym + +import ( + "bytes" + "compress/gzip" + "debug/elf" + "internal/testenv" + "io" + "os" + "os/exec" + "path/filepath" + "runtime" + "strings" + "testing" +) + +var ( + pclineTempDir string + pclinetestBinary string +) + +func dotest(t *testing.T) { + testenv.MustHaveGoBuild(t) + // For now, only works on amd64 platforms. + if runtime.GOARCH != "amd64" { + t.Skipf("skipping on non-AMD64 system %s", runtime.GOARCH) + } + // This test builds a Linux/AMD64 binary. Skipping in short mode if cross compiling. + if runtime.GOOS != "linux" && testing.Short() { + t.Skipf("skipping in short mode on non-Linux system %s", runtime.GOARCH) + } + var err error + pclineTempDir, err = os.MkdirTemp("", "pclinetest") + if err != nil { + t.Fatal(err) + } + pclinetestBinary = filepath.Join(pclineTempDir, "pclinetest") + cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", pclinetestBinary) + cmd.Dir = "testdata" + cmd.Env = append(os.Environ(), "GOOS=linux") + cmd.Stdout = os.Stdout + cmd.Stderr = os.Stderr + if err := cmd.Run(); err != nil { + t.Fatal(err) + } +} + +func endtest() { + if pclineTempDir != "" { + os.RemoveAll(pclineTempDir) + pclineTempDir = "" + pclinetestBinary = "" + } +} + +// skipIfNotELF skips the test if we are not running on an ELF system. +// These tests open and examine the test binary, and use elf.Open to do so. +func skipIfNotELF(t *testing.T) { + switch runtime.GOOS { + case "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris", "illumos": + // OK. + default: + t.Skipf("skipping on non-ELF system %s", runtime.GOOS) + } +} + +func getTable(t *testing.T) *Table { + f, tab := crack(os.Args[0], t) + f.Close() + return tab +} + +func crack(file string, t *testing.T) (*elf.File, *Table) { + // Open self + f, err := elf.Open(file) + if err != nil { + t.Fatal(err) + } + return parse(file, f, t) +} + +func parse(file string, f *elf.File, t *testing.T) (*elf.File, *Table) { + s := f.Section(".gosymtab") + if s == nil { + t.Skip("no .gosymtab section") + } + symdat, err := s.Data() + if err != nil { + f.Close() + t.Fatalf("reading %s gosymtab: %v", file, err) + } + pclndat, err := f.Section(".gopclntab").Data() + if err != nil { + f.Close() + t.Fatalf("reading %s gopclntab: %v", file, err) + } + + pcln := NewLineTable(pclndat, f.Section(".text").Addr) + tab, err := NewTable(symdat, pcln) + if err != nil { + f.Close() + t.Fatalf("parsing %s gosymtab: %v", file, err) + } + + return f, tab +} + +func TestLineFromAline(t *testing.T) { + skipIfNotELF(t) + + tab := getTable(t) + if tab.go12line != nil { + // aline's don't exist in the Go 1.2 table. + t.Skip("not relevant to Go 1.2 symbol table") + } + + // Find the sym package + pkg := tab.LookupFunc("debug/gosym.TestLineFromAline").Obj + if pkg == nil { + t.Fatalf("nil pkg") + } + + // Walk every absolute line and ensure that we hit every + // source line monotonically + lastline := make(map[string]int) + final := -1 + for i := 0; i < 10000; i++ { + path, line := pkg.lineFromAline(i) + // Check for end of object + if path == "" { + if final == -1 { + final = i - 1 + } + continue + } else if final != -1 { + t.Fatalf("reached end of package at absolute line %d, but absolute line %d mapped to %s:%d", final, i, path, line) + } + // It's okay to see files multiple times (e.g., sys.a) + if line == 1 { + lastline[path] = 1 + continue + } + // Check that the is the next line in path + ll, ok := lastline[path] + if !ok { + t.Errorf("file %s starts on line %d", path, line) + } else if line != ll+1 { + t.Fatalf("expected next line of file %s to be %d, got %d", path, ll+1, line) + } + lastline[path] = line + } + if final == -1 { + t.Errorf("never reached end of object") + } +} + +func TestLineAline(t *testing.T) { + skipIfNotELF(t) + + tab := getTable(t) + if tab.go12line != nil { + // aline's don't exist in the Go 1.2 table. + t.Skip("not relevant to Go 1.2 symbol table") + } + + for _, o := range tab.Files { + // A source file can appear multiple times in a + // object. alineFromLine will always return alines in + // the first file, so track which lines we've seen. + found := make(map[string]int) + for i := 0; i < 1000; i++ { + path, line := o.lineFromAline(i) + if path == "" { + break + } + + // cgo files are full of 'Z' symbols, which we don't handle + if len(path) > 4 && path[len(path)-4:] == ".cgo" { + continue + } + + if minline, ok := found[path]; path != "" && ok { + if minline >= line { + // We've already covered this file + continue + } + } + found[path] = line + + a, err := o.alineFromLine(path, line) + if err != nil { + t.Errorf("absolute line %d in object %s maps to %s:%d, but mapping that back gives error %s", i, o.Paths[0].Name, path, line, err) + } else if a != i { + t.Errorf("absolute line %d in object %s maps to %s:%d, which maps back to absolute line %d\n", i, o.Paths[0].Name, path, line, a) + } + } + } +} + +func TestPCLine(t *testing.T) { + dotest(t) + defer endtest() + + f, tab := crack(pclinetestBinary, t) + defer f.Close() + text := f.Section(".text") + textdat, err := text.Data() + if err != nil { + t.Fatalf("reading .text: %v", err) + } + + // Test PCToLine + sym := tab.LookupFunc("main.linefrompc") + wantLine := 0 + for pc := sym.Entry; pc < sym.End; pc++ { + off := pc - text.Addr // TODO(rsc): should not need off; bug in 8g + if textdat[off] == 255 { + break + } + wantLine += int(textdat[off]) + t.Logf("off is %d %#x (max %d)", off, textdat[off], sym.End-pc) + file, line, fn := tab.PCToLine(pc) + if fn == nil { + t.Errorf("failed to get line of PC %#x", pc) + } else if !strings.HasSuffix(file, "pclinetest.s") || line != wantLine || fn != sym { + t.Errorf("PCToLine(%#x) = %s:%d (%s), want %s:%d (%s)", pc, file, line, fn.Name, "pclinetest.s", wantLine, sym.Name) + } + } + + // Test LineToPC + sym = tab.LookupFunc("main.pcfromline") + lookupline := -1 + wantLine = 0 + off := uint64(0) // TODO(rsc): should not need off; bug in 8g + for pc := sym.Value; pc < sym.End; pc += 2 + uint64(textdat[off]) { + file, line, fn := tab.PCToLine(pc) + off = pc - text.Addr + if textdat[off] == 255 { + break + } + wantLine += int(textdat[off]) + if line != wantLine { + t.Errorf("expected line %d at PC %#x in pcfromline, got %d", wantLine, pc, line) + off = pc + 1 - text.Addr + continue + } + if lookupline == -1 { + lookupline = line + } + for ; lookupline <= line; lookupline++ { + pc2, fn2, err := tab.LineToPC(file, lookupline) + if lookupline != line { + // Should be nothing on this line + if err == nil { + t.Errorf("expected no PC at line %d, got %#x (%s)", lookupline, pc2, fn2.Name) + } + } else if err != nil { + t.Errorf("failed to get PC of line %d: %s", lookupline, err) + } else if pc != pc2 { + t.Errorf("expected PC %#x (%s) at line %d, got PC %#x (%s)", pc, fn.Name, line, pc2, fn2.Name) + } + } + off = pc + 1 - text.Addr + } +} + +func TestSymVersion(t *testing.T) { + skipIfNotELF(t) + + table := getTable(t) + if table.go12line == nil { + t.Skip("not relevant to Go 1.2+ symbol table") + } + for _, fn := range table.Funcs { + if fn.goVersion == verUnknown { + t.Fatalf("unexpected symbol version: %v", fn) + } + } +} + +// read115Executable returns a hello world executable compiled by Go 1.15. +// +// The file was compiled in /tmp/hello.go: +// +// package main +// +// func main() { +// println("hello") +// } +func read115Executable(tb testing.TB) []byte { + zippedDat, err := os.ReadFile("testdata/pcln115.gz") + if err != nil { + tb.Fatal(err) + } + var gzReader *gzip.Reader + gzReader, err = gzip.NewReader(bytes.NewBuffer(zippedDat)) + if err != nil { + tb.Fatal(err) + } + var dat []byte + dat, err = io.ReadAll(gzReader) + if err != nil { + tb.Fatal(err) + } + return dat +} + +// Test that we can parse a pclntab from 1.15. +func Test115PclnParsing(t *testing.T) { + dat := read115Executable(t) + const textStart = 0x1001000 + pcln := NewLineTable(dat, textStart) + tab, err := NewTable(nil, pcln) + if err != nil { + t.Fatal(err) + } + var f *Func + var pc uint64 + pc, f, err = tab.LineToPC("/tmp/hello.go", 3) + if err != nil { + t.Fatal(err) + } + if pcln.version != ver12 { + t.Fatal("Expected pcln to parse as an older version") + } + if pc != 0x105c280 { + t.Fatalf("expect pc = 0x105c280, got 0x%x", pc) + } + if f.Name != "main.main" { + t.Fatalf("expected to parse name as main.main, got %v", f.Name) + } +} + +var ( + sinkLineTable *LineTable + sinkTable *Table +) + +func Benchmark115(b *testing.B) { + dat := read115Executable(b) + const textStart = 0x1001000 + + b.Run("NewLineTable", func(b *testing.B) { + b.ReportAllocs() + for i := 0; i < b.N; i++ { + sinkLineTable = NewLineTable(dat, textStart) + } + }) + + pcln := NewLineTable(dat, textStart) + b.Run("NewTable", func(b *testing.B) { + b.ReportAllocs() + for i := 0; i < b.N; i++ { + var err error + sinkTable, err = NewTable(nil, pcln) + if err != nil { + b.Fatal(err) + } + } + }) + + tab, err := NewTable(nil, pcln) + if err != nil { + b.Fatal(err) + } + + b.Run("LineToPC", func(b *testing.B) { + b.ReportAllocs() + for i := 0; i < b.N; i++ { + var f *Func + var pc uint64 + pc, f, err = tab.LineToPC("/tmp/hello.go", 3) + if err != nil { + b.Fatal(err) + } + if pcln.version != ver12 { + b.Fatalf("want version=%d, got %d", ver12, pcln.version) + } + if pc != 0x105c280 { + b.Fatalf("want pc=0x105c280, got 0x%x", pc) + } + if f.Name != "main.main" { + b.Fatalf("want name=main.main, got %q", f.Name) + } + } + }) + + b.Run("PCToLine", func(b *testing.B) { + b.ReportAllocs() + for i := 0; i < b.N; i++ { + file, line, fn := tab.PCToLine(0x105c280) + if file != "/tmp/hello.go" { + b.Fatalf("want name=/tmp/hello.go, got %q", file) + } + if line != 3 { + b.Fatalf("want line=3, got %d", line) + } + if fn.Name != "main.main" { + b.Fatalf("want name=main.main, got %q", fn.Name) + } + } + }) +} diff --git a/src/debug/gosym/symtab.go b/src/debug/gosym/symtab.go new file mode 100644 index 0000000..d87b312 --- /dev/null +++ b/src/debug/gosym/symtab.go @@ -0,0 +1,774 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package gosym implements access to the Go symbol +// and line number tables embedded in Go binaries generated +// by the gc compilers. +package gosym + +import ( + "bytes" + "encoding/binary" + "fmt" + "strconv" + "strings" +) + +/* + * Symbols + */ + +// A Sym represents a single symbol table entry. +type Sym struct { + Value uint64 + Type byte + Name string + GoType uint64 + // If this symbol is a function symbol, the corresponding Func + Func *Func + + goVersion version +} + +// Static reports whether this symbol is static (not visible outside its file). +func (s *Sym) Static() bool { return s.Type >= 'a' } + +// nameWithoutInst returns s.Name if s.Name has no brackets (does not reference an +// instantiated type, function, or method). If s.Name contains brackets, then it +// returns s.Name with all the contents between (and including) the outermost left +// and right bracket removed. This is useful to ignore any extra slashes or dots +// inside the brackets from the string searches below, where needed. +func (s *Sym) nameWithoutInst() string { + start := strings.Index(s.Name, "[") + if start < 0 { + return s.Name + } + end := strings.LastIndex(s.Name, "]") + if end < 0 { + // Malformed name, should contain closing bracket too. + return s.Name + } + return s.Name[0:start] + s.Name[end+1:] +} + +// PackageName returns the package part of the symbol name, +// or the empty string if there is none. +func (s *Sym) PackageName() string { + name := s.nameWithoutInst() + + // Since go1.20, a prefix of "type:" and "go:" is a compiler-generated symbol, + // they do not belong to any package. + // + // See cmd/compile/internal/base/link.go:ReservedImports variable. + if s.goVersion >= ver120 && (strings.HasPrefix(name, "go:") || strings.HasPrefix(name, "type:")) { + return "" + } + + // For go1.18 and below, the prefix are "type." and "go." instead. + if s.goVersion <= ver118 && (strings.HasPrefix(name, "go.") || strings.HasPrefix(name, "type.")) { + return "" + } + + pathend := strings.LastIndex(name, "/") + if pathend < 0 { + pathend = 0 + } + + if i := strings.Index(name[pathend:], "."); i != -1 { + return name[:pathend+i] + } + return "" +} + +// ReceiverName returns the receiver type name of this symbol, +// or the empty string if there is none. A receiver name is only detected in +// the case that s.Name is fully-specified with a package name. +func (s *Sym) ReceiverName() string { + name := s.nameWithoutInst() + // If we find a slash in name, it should precede any bracketed expression + // that was removed, so pathend will apply correctly to name and s.Name. + pathend := strings.LastIndex(name, "/") + if pathend < 0 { + pathend = 0 + } + // Find the first dot after pathend (or from the beginning, if there was + // no slash in name). + l := strings.Index(name[pathend:], ".") + // Find the last dot after pathend (or the beginning). + r := strings.LastIndex(name[pathend:], ".") + if l == -1 || r == -1 || l == r { + // There is no receiver if we didn't find two distinct dots after pathend. + return "" + } + // Given there is a trailing '.' that is in name, find it now in s.Name. + // pathend+l should apply to s.Name, because it should be the dot in the + // package name. + r = strings.LastIndex(s.Name[pathend:], ".") + return s.Name[pathend+l+1 : pathend+r] +} + +// BaseName returns the symbol name without the package or receiver name. +func (s *Sym) BaseName() string { + name := s.nameWithoutInst() + if i := strings.LastIndex(name, "."); i != -1 { + if s.Name != name { + brack := strings.Index(s.Name, "[") + if i > brack { + // BaseName is a method name after the brackets, so + // recalculate for s.Name. Otherwise, i applies + // correctly to s.Name, since it is before the + // brackets. + i = strings.LastIndex(s.Name, ".") + } + } + return s.Name[i+1:] + } + return s.Name +} + +// A Func collects information about a single function. +type Func struct { + Entry uint64 + *Sym + End uint64 + Params []*Sym // nil for Go 1.3 and later binaries + Locals []*Sym // nil for Go 1.3 and later binaries + FrameSize int + LineTable *LineTable + Obj *Obj +} + +// An Obj represents a collection of functions in a symbol table. +// +// The exact method of division of a binary into separate Objs is an internal detail +// of the symbol table format. +// +// In early versions of Go each source file became a different Obj. +// +// In Go 1 and Go 1.1, each package produced one Obj for all Go sources +// and one Obj per C source file. +// +// In Go 1.2, there is a single Obj for the entire program. +type Obj struct { + // Funcs is a list of functions in the Obj. + Funcs []Func + + // In Go 1.1 and earlier, Paths is a list of symbols corresponding + // to the source file names that produced the Obj. + // In Go 1.2, Paths is nil. + // Use the keys of Table.Files to obtain a list of source files. + Paths []Sym // meta +} + +/* + * Symbol tables + */ + +// Table represents a Go symbol table. It stores all of the +// symbols decoded from the program and provides methods to translate +// between symbols, names, and addresses. +type Table struct { + Syms []Sym // nil for Go 1.3 and later binaries + Funcs []Func + Files map[string]*Obj // for Go 1.2 and later all files map to one Obj + Objs []Obj // for Go 1.2 and later only one Obj in slice + + go12line *LineTable // Go 1.2 line number table +} + +type sym struct { + value uint64 + gotype uint64 + typ byte + name []byte +} + +var ( + littleEndianSymtab = []byte{0xFD, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00} + bigEndianSymtab = []byte{0xFF, 0xFF, 0xFF, 0xFD, 0x00, 0x00, 0x00} + oldLittleEndianSymtab = []byte{0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00} +) + +func walksymtab(data []byte, fn func(sym) error) error { + if len(data) == 0 { // missing symtab is okay + return nil + } + var order binary.ByteOrder = binary.BigEndian + newTable := false + switch { + case bytes.HasPrefix(data, oldLittleEndianSymtab): + // Same as Go 1.0, but little endian. + // Format was used during interim development between Go 1.0 and Go 1.1. + // Should not be widespread, but easy to support. + data = data[6:] + order = binary.LittleEndian + case bytes.HasPrefix(data, bigEndianSymtab): + newTable = true + case bytes.HasPrefix(data, littleEndianSymtab): + newTable = true + order = binary.LittleEndian + } + var ptrsz int + if newTable { + if len(data) < 8 { + return &DecodingError{len(data), "unexpected EOF", nil} + } + ptrsz = int(data[7]) + if ptrsz != 4 && ptrsz != 8 { + return &DecodingError{7, "invalid pointer size", ptrsz} + } + data = data[8:] + } + var s sym + p := data + for len(p) >= 4 { + var typ byte + if newTable { + // Symbol type, value, Go type. + typ = p[0] & 0x3F + wideValue := p[0]&0x40 != 0 + goType := p[0]&0x80 != 0 + if typ < 26 { + typ += 'A' + } else { + typ += 'a' - 26 + } + s.typ = typ + p = p[1:] + if wideValue { + if len(p) < ptrsz { + return &DecodingError{len(data), "unexpected EOF", nil} + } + // fixed-width value + if ptrsz == 8 { + s.value = order.Uint64(p[0:8]) + p = p[8:] + } else { + s.value = uint64(order.Uint32(p[0:4])) + p = p[4:] + } + } else { + // varint value + s.value = 0 + shift := uint(0) + for len(p) > 0 && p[0]&0x80 != 0 { + s.value |= uint64(p[0]&0x7F) << shift + shift += 7 + p = p[1:] + } + if len(p) == 0 { + return &DecodingError{len(data), "unexpected EOF", nil} + } + s.value |= uint64(p[0]) << shift + p = p[1:] + } + if goType { + if len(p) < ptrsz { + return &DecodingError{len(data), "unexpected EOF", nil} + } + // fixed-width go type + if ptrsz == 8 { + s.gotype = order.Uint64(p[0:8]) + p = p[8:] + } else { + s.gotype = uint64(order.Uint32(p[0:4])) + p = p[4:] + } + } + } else { + // Value, symbol type. + s.value = uint64(order.Uint32(p[0:4])) + if len(p) < 5 { + return &DecodingError{len(data), "unexpected EOF", nil} + } + typ = p[4] + if typ&0x80 == 0 { + return &DecodingError{len(data) - len(p) + 4, "bad symbol type", typ} + } + typ &^= 0x80 + s.typ = typ + p = p[5:] + } + + // Name. + var i int + var nnul int + for i = 0; i < len(p); i++ { + if p[i] == 0 { + nnul = 1 + break + } + } + switch typ { + case 'z', 'Z': + p = p[i+nnul:] + for i = 0; i+2 <= len(p); i += 2 { + if p[i] == 0 && p[i+1] == 0 { + nnul = 2 + break + } + } + } + if len(p) < i+nnul { + return &DecodingError{len(data), "unexpected EOF", nil} + } + s.name = p[0:i] + i += nnul + p = p[i:] + + if !newTable { + if len(p) < 4 { + return &DecodingError{len(data), "unexpected EOF", nil} + } + // Go type. + s.gotype = uint64(order.Uint32(p[:4])) + p = p[4:] + } + fn(s) + } + return nil +} + +// NewTable decodes the Go symbol table (the ".gosymtab" section in ELF), +// returning an in-memory representation. +// Starting with Go 1.3, the Go symbol table no longer includes symbol data. +func NewTable(symtab []byte, pcln *LineTable) (*Table, error) { + var n int + err := walksymtab(symtab, func(s sym) error { + n++ + return nil + }) + if err != nil { + return nil, err + } + + var t Table + if pcln.isGo12() { + t.go12line = pcln + } + fname := make(map[uint16]string) + t.Syms = make([]Sym, 0, n) + nf := 0 + nz := 0 + lasttyp := uint8(0) + err = walksymtab(symtab, func(s sym) error { + n := len(t.Syms) + t.Syms = t.Syms[0 : n+1] + ts := &t.Syms[n] + ts.Type = s.typ + ts.Value = s.value + ts.GoType = s.gotype + ts.goVersion = pcln.version + switch s.typ { + default: + // rewrite name to use . instead of · (c2 b7) + w := 0 + b := s.name + for i := 0; i < len(b); i++ { + if b[i] == 0xc2 && i+1 < len(b) && b[i+1] == 0xb7 { + i++ + b[i] = '.' + } + b[w] = b[i] + w++ + } + ts.Name = string(s.name[0:w]) + case 'z', 'Z': + if lasttyp != 'z' && lasttyp != 'Z' { + nz++ + } + for i := 0; i < len(s.name); i += 2 { + eltIdx := binary.BigEndian.Uint16(s.name[i : i+2]) + elt, ok := fname[eltIdx] + if !ok { + return &DecodingError{-1, "bad filename code", eltIdx} + } + if n := len(ts.Name); n > 0 && ts.Name[n-1] != '/' { + ts.Name += "/" + } + ts.Name += elt + } + } + switch s.typ { + case 'T', 't', 'L', 'l': + nf++ + case 'f': + fname[uint16(s.value)] = ts.Name + } + lasttyp = s.typ + return nil + }) + if err != nil { + return nil, err + } + + t.Funcs = make([]Func, 0, nf) + t.Files = make(map[string]*Obj) + + var obj *Obj + if t.go12line != nil { + // Put all functions into one Obj. + t.Objs = make([]Obj, 1) + obj = &t.Objs[0] + t.go12line.go12MapFiles(t.Files, obj) + } else { + t.Objs = make([]Obj, 0, nz) + } + + // Count text symbols and attach frame sizes, parameters, and + // locals to them. Also, find object file boundaries. + lastf := 0 + for i := 0; i < len(t.Syms); i++ { + sym := &t.Syms[i] + switch sym.Type { + case 'Z', 'z': // path symbol + if t.go12line != nil { + // Go 1.2 binaries have the file information elsewhere. Ignore. + break + } + // Finish the current object + if obj != nil { + obj.Funcs = t.Funcs[lastf:] + } + lastf = len(t.Funcs) + + // Start new object + n := len(t.Objs) + t.Objs = t.Objs[0 : n+1] + obj = &t.Objs[n] + + // Count & copy path symbols + var end int + for end = i + 1; end < len(t.Syms); end++ { + if c := t.Syms[end].Type; c != 'Z' && c != 'z' { + break + } + } + obj.Paths = t.Syms[i:end] + i = end - 1 // loop will i++ + + // Record file names + depth := 0 + for j := range obj.Paths { + s := &obj.Paths[j] + if s.Name == "" { + depth-- + } else { + if depth == 0 { + t.Files[s.Name] = obj + } + depth++ + } + } + + case 'T', 't', 'L', 'l': // text symbol + if n := len(t.Funcs); n > 0 { + t.Funcs[n-1].End = sym.Value + } + if sym.Name == "runtime.etext" || sym.Name == "etext" { + continue + } + + // Count parameter and local (auto) syms + var np, na int + var end int + countloop: + for end = i + 1; end < len(t.Syms); end++ { + switch t.Syms[end].Type { + case 'T', 't', 'L', 'l', 'Z', 'z': + break countloop + case 'p': + np++ + case 'a': + na++ + } + } + + // Fill in the function symbol + n := len(t.Funcs) + t.Funcs = t.Funcs[0 : n+1] + fn := &t.Funcs[n] + sym.Func = fn + fn.Params = make([]*Sym, 0, np) + fn.Locals = make([]*Sym, 0, na) + fn.Sym = sym + fn.Entry = sym.Value + fn.Obj = obj + if t.go12line != nil { + // All functions share the same line table. + // It knows how to narrow down to a specific + // function quickly. + fn.LineTable = t.go12line + } else if pcln != nil { + fn.LineTable = pcln.slice(fn.Entry) + pcln = fn.LineTable + } + for j := i; j < end; j++ { + s := &t.Syms[j] + switch s.Type { + case 'm': + fn.FrameSize = int(s.Value) + case 'p': + n := len(fn.Params) + fn.Params = fn.Params[0 : n+1] + fn.Params[n] = s + case 'a': + n := len(fn.Locals) + fn.Locals = fn.Locals[0 : n+1] + fn.Locals[n] = s + } + } + i = end - 1 // loop will i++ + } + } + + if t.go12line != nil && nf == 0 { + t.Funcs = t.go12line.go12Funcs() + } + if obj != nil { + obj.Funcs = t.Funcs[lastf:] + } + return &t, nil +} + +// PCToFunc returns the function containing the program counter pc, +// or nil if there is no such function. +func (t *Table) PCToFunc(pc uint64) *Func { + funcs := t.Funcs + for len(funcs) > 0 { + m := len(funcs) / 2 + fn := &funcs[m] + switch { + case pc < fn.Entry: + funcs = funcs[0:m] + case fn.Entry <= pc && pc < fn.End: + return fn + default: + funcs = funcs[m+1:] + } + } + return nil +} + +// PCToLine looks up line number information for a program counter. +// If there is no information, it returns fn == nil. +func (t *Table) PCToLine(pc uint64) (file string, line int, fn *Func) { + if fn = t.PCToFunc(pc); fn == nil { + return + } + if t.go12line != nil { + file = t.go12line.go12PCToFile(pc) + line = t.go12line.go12PCToLine(pc) + } else { + file, line = fn.Obj.lineFromAline(fn.LineTable.PCToLine(pc)) + } + return +} + +// LineToPC looks up the first program counter on the given line in +// the named file. It returns UnknownPathError or UnknownLineError if +// there is an error looking up this line. +func (t *Table) LineToPC(file string, line int) (pc uint64, fn *Func, err error) { + obj, ok := t.Files[file] + if !ok { + return 0, nil, UnknownFileError(file) + } + + if t.go12line != nil { + pc := t.go12line.go12LineToPC(file, line) + if pc == 0 { + return 0, nil, &UnknownLineError{file, line} + } + return pc, t.PCToFunc(pc), nil + } + + abs, err := obj.alineFromLine(file, line) + if err != nil { + return + } + for i := range obj.Funcs { + f := &obj.Funcs[i] + pc := f.LineTable.LineToPC(abs, f.End) + if pc != 0 { + return pc, f, nil + } + } + return 0, nil, &UnknownLineError{file, line} +} + +// LookupSym returns the text, data, or bss symbol with the given name, +// or nil if no such symbol is found. +func (t *Table) LookupSym(name string) *Sym { + // TODO(austin) Maybe make a map + for i := range t.Syms { + s := &t.Syms[i] + switch s.Type { + case 'T', 't', 'L', 'l', 'D', 'd', 'B', 'b': + if s.Name == name { + return s + } + } + } + return nil +} + +// LookupFunc returns the text, data, or bss symbol with the given name, +// or nil if no such symbol is found. +func (t *Table) LookupFunc(name string) *Func { + for i := range t.Funcs { + f := &t.Funcs[i] + if f.Sym.Name == name { + return f + } + } + return nil +} + +// SymByAddr returns the text, data, or bss symbol starting at the given address. +func (t *Table) SymByAddr(addr uint64) *Sym { + for i := range t.Syms { + s := &t.Syms[i] + switch s.Type { + case 'T', 't', 'L', 'l', 'D', 'd', 'B', 'b': + if s.Value == addr { + return s + } + } + } + return nil +} + +/* + * Object files + */ + +// This is legacy code for Go 1.1 and earlier, which used the +// Plan 9 format for pc-line tables. This code was never quite +// correct. It's probably very close, and it's usually correct, but +// we never quite found all the corner cases. +// +// Go 1.2 and later use a simpler format, documented at golang.org/s/go12symtab. + +func (o *Obj) lineFromAline(aline int) (string, int) { + type stackEnt struct { + path string + start int + offset int + prev *stackEnt + } + + noPath := &stackEnt{"", 0, 0, nil} + tos := noPath + +pathloop: + for _, s := range o.Paths { + val := int(s.Value) + switch { + case val > aline: + break pathloop + + case val == 1: + // Start a new stack + tos = &stackEnt{s.Name, val, 0, noPath} + + case s.Name == "": + // Pop + if tos == noPath { + return "<malformed symbol table>", 0 + } + tos.prev.offset += val - tos.start + tos = tos.prev + + default: + // Push + tos = &stackEnt{s.Name, val, 0, tos} + } + } + + if tos == noPath { + return "", 0 + } + return tos.path, aline - tos.start - tos.offset + 1 +} + +func (o *Obj) alineFromLine(path string, line int) (int, error) { + if line < 1 { + return 0, &UnknownLineError{path, line} + } + + for i, s := range o.Paths { + // Find this path + if s.Name != path { + continue + } + + // Find this line at this stack level + depth := 0 + var incstart int + line += int(s.Value) + pathloop: + for _, s := range o.Paths[i:] { + val := int(s.Value) + switch { + case depth == 1 && val >= line: + return line - 1, nil + + case s.Name == "": + depth-- + if depth == 0 { + break pathloop + } else if depth == 1 { + line += val - incstart + } + + default: + if depth == 1 { + incstart = val + } + depth++ + } + } + return 0, &UnknownLineError{path, line} + } + return 0, UnknownFileError(path) +} + +/* + * Errors + */ + +// UnknownFileError represents a failure to find the specific file in +// the symbol table. +type UnknownFileError string + +func (e UnknownFileError) Error() string { return "unknown file: " + string(e) } + +// UnknownLineError represents a failure to map a line to a program +// counter, either because the line is beyond the bounds of the file +// or because there is no code on the given line. +type UnknownLineError struct { + File string + Line int +} + +func (e *UnknownLineError) Error() string { + return "no code at " + e.File + ":" + strconv.Itoa(e.Line) +} + +// DecodingError represents an error during the decoding of +// the symbol table. +type DecodingError struct { + off int + msg string + val any +} + +func (e *DecodingError) Error() string { + msg := e.msg + if e.val != nil { + msg += fmt.Sprintf(" '%v'", e.val) + } + msg += fmt.Sprintf(" at byte %#x", e.off) + return msg +} diff --git a/src/debug/gosym/symtab_test.go b/src/debug/gosym/symtab_test.go new file mode 100644 index 0000000..bb1f267 --- /dev/null +++ b/src/debug/gosym/symtab_test.go @@ -0,0 +1,87 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package gosym + +import ( + "fmt" + "testing" +) + +func assertString(t *testing.T, dsc, out, tgt string) { + if out != tgt { + t.Fatalf("Expected: %q Actual: %q for %s", tgt, out, dsc) + } +} + +func TestStandardLibPackage(t *testing.T) { + s1 := Sym{Name: "io.(*LimitedReader).Read"} + s2 := Sym{Name: "io.NewSectionReader"} + assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "io") + assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "io") + assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*LimitedReader)") + assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "") +} + +func TestStandardLibPathPackage(t *testing.T) { + s1 := Sym{Name: "debug/gosym.(*LineTable).PCToLine"} + s2 := Sym{Name: "debug/gosym.NewTable"} + assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "debug/gosym") + assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "debug/gosym") + assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*LineTable)") + assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "") +} + +func TestGenericNames(t *testing.T) { + s1 := Sym{Name: "main.set[int]"} + s2 := Sym{Name: "main.(*value[int]).get"} + s3 := Sym{Name: "a/b.absDifference[c/d.orderedAbs[float64]]"} + s4 := Sym{Name: "main.testfunction[.shape.int]"} + assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "main") + assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "main") + assertString(t, fmt.Sprintf("package of %q", s3.Name), s3.PackageName(), "a/b") + assertString(t, fmt.Sprintf("package of %q", s4.Name), s4.PackageName(), "main") + assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "") + assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "(*value[int])") + assertString(t, fmt.Sprintf("receiver of %q", s3.Name), s3.ReceiverName(), "") + assertString(t, fmt.Sprintf("receiver of %q", s4.Name), s4.ReceiverName(), "") + assertString(t, fmt.Sprintf("base of %q", s1.Name), s1.BaseName(), "set[int]") + assertString(t, fmt.Sprintf("base of %q", s2.Name), s2.BaseName(), "get") + assertString(t, fmt.Sprintf("base of %q", s3.Name), s3.BaseName(), "absDifference[c/d.orderedAbs[float64]]") + assertString(t, fmt.Sprintf("base of %q", s4.Name), s4.BaseName(), "testfunction[.shape.int]") +} + +func TestRemotePackage(t *testing.T) { + s1 := Sym{Name: "github.com/docker/doc.ker/pkg/mflag.(*FlagSet).PrintDefaults"} + s2 := Sym{Name: "github.com/docker/doc.ker/pkg/mflag.PrintDefaults"} + assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "github.com/docker/doc.ker/pkg/mflag") + assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "github.com/docker/doc.ker/pkg/mflag") + assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*FlagSet)") + assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "") +} + +func TestIssue29551(t *testing.T) { + tests := []struct { + sym Sym + pkgName string + }{ + {Sym{goVersion: ver120, Name: "type:.eq.[9]debug/elf.intName"}, ""}, + {Sym{goVersion: ver120, Name: "type:.hash.debug/elf.ProgHeader"}, ""}, + {Sym{goVersion: ver120, Name: "type:.eq.runtime._panic"}, ""}, + {Sym{goVersion: ver120, Name: "type:.hash.struct { runtime.gList; runtime.n int32 }"}, ""}, + {Sym{goVersion: ver120, Name: "go:(*struct { sync.Mutex; math/big.table [64]math/big"}, ""}, + {Sym{goVersion: ver120, Name: "go.uber.org/zap/buffer.(*Buffer).AppendString"}, "go.uber.org/zap/buffer"}, + {Sym{goVersion: ver118, Name: "type..eq.[9]debug/elf.intName"}, ""}, + {Sym{goVersion: ver118, Name: "type..hash.debug/elf.ProgHeader"}, ""}, + {Sym{goVersion: ver118, Name: "type..eq.runtime._panic"}, ""}, + {Sym{goVersion: ver118, Name: "type..hash.struct { runtime.gList; runtime.n int32 }"}, ""}, + {Sym{goVersion: ver118, Name: "go.(*struct { sync.Mutex; math/big.table [64]math/big"}, ""}, + // unfortunate + {Sym{goVersion: ver118, Name: "go.uber.org/zap/buffer.(*Buffer).AppendString"}, ""}, + } + + for _, tc := range tests { + assertString(t, fmt.Sprintf("package of %q", tc.sym.Name), tc.sym.PackageName(), tc.pkgName) + } +} diff --git a/src/debug/gosym/testdata/main.go b/src/debug/gosym/testdata/main.go new file mode 100644 index 0000000..b770218 --- /dev/null +++ b/src/debug/gosym/testdata/main.go @@ -0,0 +1,10 @@ +package main + +func linefrompc() +func pcfromline() + +func main() { + // Prevent GC of our test symbols + linefrompc() + pcfromline() +} diff --git a/src/debug/gosym/testdata/pclinetest.h b/src/debug/gosym/testdata/pclinetest.h new file mode 100644 index 0000000..156c0b8 --- /dev/null +++ b/src/debug/gosym/testdata/pclinetest.h @@ -0,0 +1,9 @@ +// +build ignore + +// Empty include file to generate z symbols + + + + + +// EOF diff --git a/src/debug/gosym/testdata/pclinetest.s b/src/debug/gosym/testdata/pclinetest.s new file mode 100644 index 0000000..53461cd --- /dev/null +++ b/src/debug/gosym/testdata/pclinetest.s @@ -0,0 +1,48 @@ +TEXT ·linefrompc(SB),4,$0 // Each byte stores its line delta +BYTE $2; +BYTE $1; +BYTE $1; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; 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BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; +BYTE $1; +BYTE $1; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; +#include "pclinetest.h" +BYTE $2; +#include "pclinetest.h" +BYTE $2; +BYTE $255; + +TEXT ·pcfromline(SB),4,$0 // Each record stores its line delta, then n, then n more bytes +BYTE $32; BYTE $0; +BYTE $1; BYTE $1; BYTE $0; +BYTE $1; BYTE $0; + +BYTE $2; BYTE $4; BYTE $0; BYTE $0; BYTE $0; BYTE $0; + + +#include "pclinetest.h" +BYTE $4; BYTE $0; + + +BYTE $3; BYTE $3; BYTE $0; BYTE $0; BYTE $0; +#include "pclinetest.h" + + +BYTE $4; BYTE $3; BYTE $0; BYTE $0; BYTE $0; +BYTE $255; diff --git a/src/debug/gosym/testdata/pcln115.gz b/src/debug/gosym/testdata/pcln115.gz Binary files differnew file mode 100644 index 0000000..db5c3d4 --- /dev/null +++ b/src/debug/gosym/testdata/pcln115.gz diff --git a/src/debug/macho/fat.go b/src/debug/macho/fat.go new file mode 100644 index 0000000..679cefb --- /dev/null +++ b/src/debug/macho/fat.go @@ -0,0 +1,153 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package macho + +import ( + "encoding/binary" + "fmt" + "internal/saferio" + "io" + "os" +) + +// A FatFile is a Mach-O universal binary that contains at least one architecture. +type FatFile struct { + Magic uint32 + Arches []FatArch + closer io.Closer +} + +// A FatArchHeader represents a fat header for a specific image architecture. +type FatArchHeader struct { + Cpu Cpu + SubCpu uint32 + Offset uint32 + Size uint32 + Align uint32 +} + +const fatArchHeaderSize = 5 * 4 + +// A FatArch is a Mach-O File inside a FatFile. +type FatArch struct { + FatArchHeader + *File +} + +// ErrNotFat is returned from NewFatFile or OpenFat when the file is not a +// universal binary but may be a thin binary, based on its magic number. +var ErrNotFat = &FormatError{0, "not a fat Mach-O file", nil} + +// NewFatFile creates a new FatFile for accessing all the Mach-O images in a +// universal binary. The Mach-O binary is expected to start at position 0 in +// the ReaderAt. +func NewFatFile(r io.ReaderAt) (*FatFile, error) { + var ff FatFile + sr := io.NewSectionReader(r, 0, 1<<63-1) + + // Read the fat_header struct, which is always in big endian. + // Start with the magic number. + err := binary.Read(sr, binary.BigEndian, &ff.Magic) + if err != nil { + return nil, &FormatError{0, "error reading magic number", nil} + } else if ff.Magic != MagicFat { + // See if this is a Mach-O file via its magic number. The magic + // must be converted to little endian first though. + var buf [4]byte + binary.BigEndian.PutUint32(buf[:], ff.Magic) + leMagic := binary.LittleEndian.Uint32(buf[:]) + if leMagic == Magic32 || leMagic == Magic64 { + return nil, ErrNotFat + } else { + return nil, &FormatError{0, "invalid magic number", nil} + } + } + offset := int64(4) + + // Read the number of FatArchHeaders that come after the fat_header. + var narch uint32 + err = binary.Read(sr, binary.BigEndian, &narch) + if err != nil { + return nil, &FormatError{offset, "invalid fat_header", nil} + } + offset += 4 + + if narch < 1 { + return nil, &FormatError{offset, "file contains no images", nil} + } + + // Combine the Cpu and SubCpu (both uint32) into a uint64 to make sure + // there are not duplicate architectures. + seenArches := make(map[uint64]bool) + // Make sure that all images are for the same MH_ type. + var machoType Type + + // Following the fat_header comes narch fat_arch structs that index + // Mach-O images further in the file. + c := saferio.SliceCap((*FatArch)(nil), uint64(narch)) + if c < 0 { + return nil, &FormatError{offset, "too many images", nil} + } + ff.Arches = make([]FatArch, 0, c) + for i := uint32(0); i < narch; i++ { + var fa FatArch + err = binary.Read(sr, binary.BigEndian, &fa.FatArchHeader) + if err != nil { + return nil, &FormatError{offset, "invalid fat_arch header", nil} + } + offset += fatArchHeaderSize + + fr := io.NewSectionReader(r, int64(fa.Offset), int64(fa.Size)) + fa.File, err = NewFile(fr) + if err != nil { + return nil, err + } + + // Make sure the architecture for this image is not duplicate. + seenArch := (uint64(fa.Cpu) << 32) | uint64(fa.SubCpu) + if o, k := seenArches[seenArch]; o || k { + return nil, &FormatError{offset, fmt.Sprintf("duplicate architecture cpu=%v, subcpu=%#x", fa.Cpu, fa.SubCpu), nil} + } + seenArches[seenArch] = true + + // Make sure the Mach-O type matches that of the first image. + if i == 0 { + machoType = fa.Type + } else { + if fa.Type != machoType { + return nil, &FormatError{offset, fmt.Sprintf("Mach-O type for architecture #%d (type=%#x) does not match first (type=%#x)", i, fa.Type, machoType), nil} + } + } + + ff.Arches = append(ff.Arches, fa) + } + + return &ff, nil +} + +// OpenFat opens the named file using os.Open and prepares it for use as a Mach-O +// universal binary. +func OpenFat(name string) (*FatFile, error) { + f, err := os.Open(name) + if err != nil { + return nil, err + } + ff, err := NewFatFile(f) + if err != nil { + f.Close() + return nil, err + } + ff.closer = f + return ff, nil +} + +func (ff *FatFile) Close() error { + var err error + if ff.closer != nil { + err = ff.closer.Close() + ff.closer = nil + } + return err +} diff --git a/src/debug/macho/file.go b/src/debug/macho/file.go new file mode 100644 index 0000000..ecde25a --- /dev/null +++ b/src/debug/macho/file.go @@ -0,0 +1,726 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package macho implements access to Mach-O object files. + +# Security + +This package is not designed to be hardened against adversarial inputs, and is +outside the scope of https://go.dev/security/policy. In particular, only basic +validation is done when parsing object files. As such, care should be taken when +parsing untrusted inputs, as parsing malformed files may consume significant +resources, or cause panics. +*/ +package macho + +// High level access to low level data structures. + +import ( + "bytes" + "compress/zlib" + "debug/dwarf" + "encoding/binary" + "fmt" + "internal/saferio" + "io" + "os" + "strings" +) + +// A File represents an open Mach-O file. +type File struct { + FileHeader + ByteOrder binary.ByteOrder + Loads []Load + Sections []*Section + + Symtab *Symtab + Dysymtab *Dysymtab + + closer io.Closer +} + +// A Load represents any Mach-O load command. +type Load interface { + Raw() []byte +} + +// A LoadBytes is the uninterpreted bytes of a Mach-O load command. +type LoadBytes []byte + +func (b LoadBytes) Raw() []byte { return b } + +// A SegmentHeader is the header for a Mach-O 32-bit or 64-bit load segment command. +type SegmentHeader struct { + Cmd LoadCmd + Len uint32 + Name string + Addr uint64 + Memsz uint64 + Offset uint64 + Filesz uint64 + Maxprot uint32 + Prot uint32 + Nsect uint32 + Flag uint32 +} + +// A Segment represents a Mach-O 32-bit or 64-bit load segment command. +type Segment struct { + LoadBytes + SegmentHeader + + // Embed ReaderAt for ReadAt method. + // Do not embed SectionReader directly + // to avoid having Read and Seek. + // If a client wants Read and Seek it must use + // Open() to avoid fighting over the seek offset + // with other clients. + io.ReaderAt + sr *io.SectionReader +} + +// Data reads and returns the contents of the segment. +func (s *Segment) Data() ([]byte, error) { + return saferio.ReadDataAt(s.sr, s.Filesz, 0) +} + +// Open returns a new ReadSeeker reading the segment. +func (s *Segment) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) } + +type SectionHeader struct { + Name string + Seg string + Addr uint64 + Size uint64 + Offset uint32 + Align uint32 + Reloff uint32 + Nreloc uint32 + Flags uint32 +} + +// A Reloc represents a Mach-O relocation. +type Reloc struct { + Addr uint32 + Value uint32 + // when Scattered == false && Extern == true, Value is the symbol number. + // when Scattered == false && Extern == false, Value is the section number. + // when Scattered == true, Value is the value that this reloc refers to. + Type uint8 + Len uint8 // 0=byte, 1=word, 2=long, 3=quad + Pcrel bool + Extern bool // valid if Scattered == false + Scattered bool +} + +type Section struct { + SectionHeader + Relocs []Reloc + + // Embed ReaderAt for ReadAt method. + // Do not embed SectionReader directly + // to avoid having Read and Seek. + // If a client wants Read and Seek it must use + // Open() to avoid fighting over the seek offset + // with other clients. + io.ReaderAt + sr *io.SectionReader +} + +// Data reads and returns the contents of the Mach-O section. +func (s *Section) Data() ([]byte, error) { + return saferio.ReadDataAt(s.sr, s.Size, 0) +} + +// Open returns a new ReadSeeker reading the Mach-O section. +func (s *Section) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) } + +// A Dylib represents a Mach-O load dynamic library command. +type Dylib struct { + LoadBytes + Name string + Time uint32 + CurrentVersion uint32 + CompatVersion uint32 +} + +// A Symtab represents a Mach-O symbol table command. +type Symtab struct { + LoadBytes + SymtabCmd + Syms []Symbol +} + +// A Dysymtab represents a Mach-O dynamic symbol table command. +type Dysymtab struct { + LoadBytes + DysymtabCmd + IndirectSyms []uint32 // indices into Symtab.Syms +} + +// A Rpath represents a Mach-O rpath command. +type Rpath struct { + LoadBytes + Path string +} + +// A Symbol is a Mach-O 32-bit or 64-bit symbol table entry. +type Symbol struct { + Name string + Type uint8 + Sect uint8 + Desc uint16 + Value uint64 +} + +/* + * Mach-O reader + */ + +// FormatError is returned by some operations if the data does +// not have the correct format for an object file. +type FormatError struct { + off int64 + msg string + val any +} + +func (e *FormatError) Error() string { + msg := e.msg + if e.val != nil { + msg += fmt.Sprintf(" '%v'", e.val) + } + msg += fmt.Sprintf(" in record at byte %#x", e.off) + return msg +} + +// Open opens the named file using os.Open and prepares it for use as a Mach-O binary. +func Open(name string) (*File, error) { + f, err := os.Open(name) + if err != nil { + return nil, err + } + ff, err := NewFile(f) + if err != nil { + f.Close() + return nil, err + } + ff.closer = f + return ff, nil +} + +// Close closes the File. +// If the File was created using NewFile directly instead of Open, +// Close has no effect. +func (f *File) Close() error { + var err error + if f.closer != nil { + err = f.closer.Close() + f.closer = nil + } + return err +} + +// NewFile creates a new File for accessing a Mach-O binary in an underlying reader. +// The Mach-O binary is expected to start at position 0 in the ReaderAt. +func NewFile(r io.ReaderAt) (*File, error) { + f := new(File) + sr := io.NewSectionReader(r, 0, 1<<63-1) + + // Read and decode Mach magic to determine byte order, size. + // Magic32 and Magic64 differ only in the bottom bit. + var ident [4]byte + if _, err := r.ReadAt(ident[0:], 0); err != nil { + return nil, err + } + be := binary.BigEndian.Uint32(ident[0:]) + le := binary.LittleEndian.Uint32(ident[0:]) + switch Magic32 &^ 1 { + case be &^ 1: + f.ByteOrder = binary.BigEndian + f.Magic = be + case le &^ 1: + f.ByteOrder = binary.LittleEndian + f.Magic = le + default: + return nil, &FormatError{0, "invalid magic number", nil} + } + + // Read entire file header. + if err := binary.Read(sr, f.ByteOrder, &f.FileHeader); err != nil { + return nil, err + } + + // Then load commands. + offset := int64(fileHeaderSize32) + if f.Magic == Magic64 { + offset = fileHeaderSize64 + } + dat, err := saferio.ReadDataAt(r, uint64(f.Cmdsz), offset) + if err != nil { + return nil, err + } + c := saferio.SliceCap((*Load)(nil), uint64(f.Ncmd)) + if c < 0 { + return nil, &FormatError{offset, "too many load commands", nil} + } + f.Loads = make([]Load, 0, c) + bo := f.ByteOrder + for i := uint32(0); i < f.Ncmd; i++ { + // Each load command begins with uint32 command and length. + if len(dat) < 8 { + return nil, &FormatError{offset, "command block too small", nil} + } + cmd, siz := LoadCmd(bo.Uint32(dat[0:4])), bo.Uint32(dat[4:8]) + if siz < 8 || siz > uint32(len(dat)) { + return nil, &FormatError{offset, "invalid command block size", nil} + } + var cmddat []byte + cmddat, dat = dat[0:siz], dat[siz:] + offset += int64(siz) + var s *Segment + switch cmd { + default: + f.Loads = append(f.Loads, LoadBytes(cmddat)) + + case LoadCmdRpath: + var hdr RpathCmd + b := bytes.NewReader(cmddat) + if err := binary.Read(b, bo, &hdr); err != nil { + return nil, err + } + l := new(Rpath) + if hdr.Path >= uint32(len(cmddat)) { + return nil, &FormatError{offset, "invalid path in rpath command", hdr.Path} + } + l.Path = cstring(cmddat[hdr.Path:]) + l.LoadBytes = LoadBytes(cmddat) + f.Loads = append(f.Loads, l) + + case LoadCmdDylib: + var hdr DylibCmd + b := bytes.NewReader(cmddat) + if err := binary.Read(b, bo, &hdr); err != nil { + return nil, err + } + l := new(Dylib) + if hdr.Name >= uint32(len(cmddat)) { + return nil, &FormatError{offset, "invalid name in dynamic library command", hdr.Name} + } + l.Name = cstring(cmddat[hdr.Name:]) + l.Time = hdr.Time + l.CurrentVersion = hdr.CurrentVersion + l.CompatVersion = hdr.CompatVersion + l.LoadBytes = LoadBytes(cmddat) + f.Loads = append(f.Loads, l) + + case LoadCmdSymtab: + var hdr SymtabCmd + b := bytes.NewReader(cmddat) + if err := binary.Read(b, bo, &hdr); err != nil { + return nil, err + } + strtab := make([]byte, hdr.Strsize) + if _, err := r.ReadAt(strtab, int64(hdr.Stroff)); err != nil { + return nil, err + } + var symsz int + if f.Magic == Magic64 { + symsz = 16 + } else { + symsz = 12 + } + symdat, err := saferio.ReadDataAt(r, uint64(hdr.Nsyms)*uint64(symsz), int64(hdr.Symoff)) + if err != nil { + return nil, err + } + st, err := f.parseSymtab(symdat, strtab, cmddat, &hdr, offset) + if err != nil { + return nil, err + } + f.Loads = append(f.Loads, st) + f.Symtab = st + + case LoadCmdDysymtab: + var hdr DysymtabCmd + b := bytes.NewReader(cmddat) + if err := binary.Read(b, bo, &hdr); err != nil { + return nil, err + } + if hdr.Iundefsym > uint32(len(f.Symtab.Syms)) { + return nil, &FormatError{offset, fmt.Sprintf( + "undefined symbols index in dynamic symbol table command is greater than symbol table length (%d > %d)", + hdr.Iundefsym, len(f.Symtab.Syms)), nil} + } else if hdr.Iundefsym+hdr.Nundefsym > uint32(len(f.Symtab.Syms)) { + return nil, &FormatError{offset, fmt.Sprintf( + "number of undefined symbols after index in dynamic symbol table command is greater than symbol table length (%d > %d)", + hdr.Iundefsym+hdr.Nundefsym, len(f.Symtab.Syms)), nil} + } + dat := make([]byte, hdr.Nindirectsyms*4) + if _, err := r.ReadAt(dat, int64(hdr.Indirectsymoff)); err != nil { + return nil, err + } + x := make([]uint32, hdr.Nindirectsyms) + if err := binary.Read(bytes.NewReader(dat), bo, x); err != nil { + return nil, err + } + st := new(Dysymtab) + st.LoadBytes = LoadBytes(cmddat) + st.DysymtabCmd = hdr + st.IndirectSyms = x + f.Loads = append(f.Loads, st) + f.Dysymtab = st + + case LoadCmdSegment: + var seg32 Segment32 + b := bytes.NewReader(cmddat) + if err := binary.Read(b, bo, &seg32); err != nil { + return nil, err + } + s = new(Segment) + s.LoadBytes = cmddat + s.Cmd = cmd + s.Len = siz + s.Name = cstring(seg32.Name[0:]) + s.Addr = uint64(seg32.Addr) + s.Memsz = uint64(seg32.Memsz) + s.Offset = uint64(seg32.Offset) + s.Filesz = uint64(seg32.Filesz) + s.Maxprot = seg32.Maxprot + s.Prot = seg32.Prot + s.Nsect = seg32.Nsect + s.Flag = seg32.Flag + f.Loads = append(f.Loads, s) + for i := 0; i < int(s.Nsect); i++ { + var sh32 Section32 + if err := binary.Read(b, bo, &sh32); err != nil { + return nil, err + } + sh := new(Section) + sh.Name = cstring(sh32.Name[0:]) + sh.Seg = cstring(sh32.Seg[0:]) + sh.Addr = uint64(sh32.Addr) + sh.Size = uint64(sh32.Size) + sh.Offset = sh32.Offset + sh.Align = sh32.Align + sh.Reloff = sh32.Reloff + sh.Nreloc = sh32.Nreloc + sh.Flags = sh32.Flags + if err := f.pushSection(sh, r); err != nil { + return nil, err + } + } + + case LoadCmdSegment64: + var seg64 Segment64 + b := bytes.NewReader(cmddat) + if err := binary.Read(b, bo, &seg64); err != nil { + return nil, err + } + s = new(Segment) + s.LoadBytes = cmddat + s.Cmd = cmd + s.Len = siz + s.Name = cstring(seg64.Name[0:]) + s.Addr = seg64.Addr + s.Memsz = seg64.Memsz + s.Offset = seg64.Offset + s.Filesz = seg64.Filesz + s.Maxprot = seg64.Maxprot + s.Prot = seg64.Prot + s.Nsect = seg64.Nsect + s.Flag = seg64.Flag + f.Loads = append(f.Loads, s) + for i := 0; i < int(s.Nsect); i++ { + var sh64 Section64 + if err := binary.Read(b, bo, &sh64); err != nil { + return nil, err + } + sh := new(Section) + sh.Name = cstring(sh64.Name[0:]) + sh.Seg = cstring(sh64.Seg[0:]) + sh.Addr = sh64.Addr + sh.Size = sh64.Size + sh.Offset = sh64.Offset + sh.Align = sh64.Align + sh.Reloff = sh64.Reloff + sh.Nreloc = sh64.Nreloc + sh.Flags = sh64.Flags + if err := f.pushSection(sh, r); err != nil { + return nil, err + } + } + } + if s != nil { + if int64(s.Offset) < 0 { + return nil, &FormatError{offset, "invalid section offset", s.Offset} + } + if int64(s.Filesz) < 0 { + return nil, &FormatError{offset, "invalid section file size", s.Filesz} + } + s.sr = io.NewSectionReader(r, int64(s.Offset), int64(s.Filesz)) + s.ReaderAt = s.sr + } + } + return f, nil +} + +func (f *File) parseSymtab(symdat, strtab, cmddat []byte, hdr *SymtabCmd, offset int64) (*Symtab, error) { + bo := f.ByteOrder + c := saferio.SliceCap((*Symbol)(nil), uint64(hdr.Nsyms)) + if c < 0 { + return nil, &FormatError{offset, "too many symbols", nil} + } + symtab := make([]Symbol, 0, c) + b := bytes.NewReader(symdat) + for i := 0; i < int(hdr.Nsyms); i++ { + var n Nlist64 + if f.Magic == Magic64 { + if err := binary.Read(b, bo, &n); err != nil { + return nil, err + } + } else { + var n32 Nlist32 + if err := binary.Read(b, bo, &n32); err != nil { + return nil, err + } + n.Name = n32.Name + n.Type = n32.Type + n.Sect = n32.Sect + n.Desc = n32.Desc + n.Value = uint64(n32.Value) + } + if n.Name >= uint32(len(strtab)) { + return nil, &FormatError{offset, "invalid name in symbol table", n.Name} + } + // We add "_" to Go symbols. Strip it here. See issue 33808. + name := cstring(strtab[n.Name:]) + if strings.Contains(name, ".") && name[0] == '_' { + name = name[1:] + } + symtab = append(symtab, Symbol{ + Name: name, + Type: n.Type, + Sect: n.Sect, + Desc: n.Desc, + Value: n.Value, + }) + } + st := new(Symtab) + st.LoadBytes = LoadBytes(cmddat) + st.Syms = symtab + return st, nil +} + +type relocInfo struct { + Addr uint32 + Symnum uint32 +} + +func (f *File) pushSection(sh *Section, r io.ReaderAt) error { + f.Sections = append(f.Sections, sh) + sh.sr = io.NewSectionReader(r, int64(sh.Offset), int64(sh.Size)) + sh.ReaderAt = sh.sr + + if sh.Nreloc > 0 { + reldat, err := saferio.ReadDataAt(r, uint64(sh.Nreloc)*8, int64(sh.Reloff)) + if err != nil { + return err + } + b := bytes.NewReader(reldat) + + bo := f.ByteOrder + + sh.Relocs = make([]Reloc, sh.Nreloc) + for i := range sh.Relocs { + rel := &sh.Relocs[i] + + var ri relocInfo + if err := binary.Read(b, bo, &ri); err != nil { + return err + } + + if ri.Addr&(1<<31) != 0 { // scattered + rel.Addr = ri.Addr & (1<<24 - 1) + rel.Type = uint8((ri.Addr >> 24) & (1<<4 - 1)) + rel.Len = uint8((ri.Addr >> 28) & (1<<2 - 1)) + rel.Pcrel = ri.Addr&(1<<30) != 0 + rel.Value = ri.Symnum + rel.Scattered = true + } else { + switch bo { + case binary.LittleEndian: + rel.Addr = ri.Addr + rel.Value = ri.Symnum & (1<<24 - 1) + rel.Pcrel = ri.Symnum&(1<<24) != 0 + rel.Len = uint8((ri.Symnum >> 25) & (1<<2 - 1)) + rel.Extern = ri.Symnum&(1<<27) != 0 + rel.Type = uint8((ri.Symnum >> 28) & (1<<4 - 1)) + case binary.BigEndian: + rel.Addr = ri.Addr + rel.Value = ri.Symnum >> 8 + rel.Pcrel = ri.Symnum&(1<<7) != 0 + rel.Len = uint8((ri.Symnum >> 5) & (1<<2 - 1)) + rel.Extern = ri.Symnum&(1<<4) != 0 + rel.Type = uint8(ri.Symnum & (1<<4 - 1)) + default: + panic("unreachable") + } + } + } + } + + return nil +} + +func cstring(b []byte) string { + i := bytes.IndexByte(b, 0) + if i == -1 { + i = len(b) + } + return string(b[0:i]) +} + +// Segment returns the first Segment with the given name, or nil if no such segment exists. +func (f *File) Segment(name string) *Segment { + for _, l := range f.Loads { + if s, ok := l.(*Segment); ok && s.Name == name { + return s + } + } + return nil +} + +// Section returns the first section with the given name, or nil if no such +// section exists. +func (f *File) Section(name string) *Section { + for _, s := range f.Sections { + if s.Name == name { + return s + } + } + return nil +} + +// DWARF returns the DWARF debug information for the Mach-O file. +func (f *File) DWARF() (*dwarf.Data, error) { + dwarfSuffix := func(s *Section) string { + switch { + case strings.HasPrefix(s.Name, "__debug_"): + return s.Name[8:] + case strings.HasPrefix(s.Name, "__zdebug_"): + return s.Name[9:] + default: + return "" + } + + } + sectionData := func(s *Section) ([]byte, error) { + b, err := s.Data() + if err != nil && uint64(len(b)) < s.Size { + return nil, err + } + + if len(b) >= 12 && string(b[:4]) == "ZLIB" { + dlen := binary.BigEndian.Uint64(b[4:12]) + dbuf := make([]byte, dlen) + r, err := zlib.NewReader(bytes.NewBuffer(b[12:])) + if err != nil { + return nil, err + } + if _, err := io.ReadFull(r, dbuf); err != nil { + return nil, err + } + if err := r.Close(); err != nil { + return nil, err + } + b = dbuf + } + return b, nil + } + + // There are many other DWARF sections, but these + // are the ones the debug/dwarf package uses. + // Don't bother loading others. + var dat = map[string][]byte{"abbrev": nil, "info": nil, "str": nil, "line": nil, "ranges": nil} + for _, s := range f.Sections { + suffix := dwarfSuffix(s) + if suffix == "" { + continue + } + if _, ok := dat[suffix]; !ok { + continue + } + b, err := sectionData(s) + if err != nil { + return nil, err + } + dat[suffix] = b + } + + d, err := dwarf.New(dat["abbrev"], nil, nil, dat["info"], dat["line"], nil, dat["ranges"], dat["str"]) + if err != nil { + return nil, err + } + + // Look for DWARF4 .debug_types sections and DWARF5 sections. + for i, s := range f.Sections { + suffix := dwarfSuffix(s) + if suffix == "" { + continue + } + if _, ok := dat[suffix]; ok { + // Already handled. + continue + } + + b, err := sectionData(s) + if err != nil { + return nil, err + } + + if suffix == "types" { + err = d.AddTypes(fmt.Sprintf("types-%d", i), b) + } else { + err = d.AddSection(".debug_"+suffix, b) + } + if err != nil { + return nil, err + } + } + + return d, nil +} + +// ImportedSymbols returns the names of all symbols +// referred to by the binary f that are expected to be +// satisfied by other libraries at dynamic load time. +func (f *File) ImportedSymbols() ([]string, error) { + if f.Dysymtab == nil || f.Symtab == nil { + return nil, &FormatError{0, "missing symbol table", nil} + } + + st := f.Symtab + dt := f.Dysymtab + var all []string + for _, s := range st.Syms[dt.Iundefsym : dt.Iundefsym+dt.Nundefsym] { + all = append(all, s.Name) + } + return all, nil +} + +// ImportedLibraries returns the paths of all libraries +// referred to by the binary f that are expected to be +// linked with the binary at dynamic link time. +func (f *File) ImportedLibraries() ([]string, error) { + var all []string + for _, l := range f.Loads { + if lib, ok := l.(*Dylib); ok { + all = append(all, lib.Name) + } + } + return all, nil +} diff --git a/src/debug/macho/file_test.go b/src/debug/macho/file_test.go new file mode 100644 index 0000000..313c376 --- /dev/null +++ b/src/debug/macho/file_test.go @@ -0,0 +1,425 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package macho + +import ( + "bytes" + "internal/obscuretestdata" + "io" + "reflect" + "testing" +) + +type fileTest struct { + file string + hdr FileHeader + loads []any + sections []*SectionHeader + relocations map[string][]Reloc +} + +var fileTests = []fileTest{ + { + "testdata/gcc-386-darwin-exec.base64", + FileHeader{0xfeedface, Cpu386, 0x3, 0x2, 0xc, 0x3c0, 0x85}, + []any{ + &SegmentHeader{LoadCmdSegment, 0x38, "__PAGEZERO", 0x0, 0x1000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, + &SegmentHeader{LoadCmdSegment, 0xc0, "__TEXT", 0x1000, 0x1000, 0x0, 0x1000, 0x7, 0x5, 0x2, 0x0}, + &SegmentHeader{LoadCmdSegment, 0xc0, "__DATA", 0x2000, 0x1000, 0x1000, 0x1000, 0x7, 0x3, 0x2, 0x0}, + &SegmentHeader{LoadCmdSegment, 0x7c, "__IMPORT", 0x3000, 0x1000, 0x2000, 0x1000, 0x7, 0x7, 0x1, 0x0}, + &SegmentHeader{LoadCmdSegment, 0x38, "__LINKEDIT", 0x4000, 0x1000, 0x3000, 0x12c, 0x7, 0x1, 0x0, 0x0}, + nil, // LC_SYMTAB + nil, // LC_DYSYMTAB + nil, // LC_LOAD_DYLINKER + nil, // LC_UUID + nil, // LC_UNIXTHREAD + &Dylib{nil, "/usr/lib/libgcc_s.1.dylib", 0x2, 0x10000, 0x10000}, + &Dylib{nil, "/usr/lib/libSystem.B.dylib", 0x2, 0x6f0104, 0x10000}, + }, + []*SectionHeader{ + {"__text", "__TEXT", 0x1f68, 0x88, 0xf68, 0x2, 0x0, 0x0, 0x80000400}, + {"__cstring", "__TEXT", 0x1ff0, 0xd, 0xff0, 0x0, 0x0, 0x0, 0x2}, + {"__data", "__DATA", 0x2000, 0x14, 0x1000, 0x2, 0x0, 0x0, 0x0}, + {"__dyld", "__DATA", 0x2014, 0x1c, 0x1014, 0x2, 0x0, 0x0, 0x0}, + {"__jump_table", "__IMPORT", 0x3000, 0xa, 0x2000, 0x6, 0x0, 0x0, 0x4000008}, + }, + nil, + }, + { + "testdata/gcc-amd64-darwin-exec.base64", + FileHeader{0xfeedfacf, CpuAmd64, 0x80000003, 0x2, 0xb, 0x568, 0x85}, + []any{ + &SegmentHeader{LoadCmdSegment64, 0x48, "__PAGEZERO", 0x0, 0x100000000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, + &SegmentHeader{LoadCmdSegment64, 0x1d8, "__TEXT", 0x100000000, 0x1000, 0x0, 0x1000, 0x7, 0x5, 0x5, 0x0}, + &SegmentHeader{LoadCmdSegment64, 0x138, "__DATA", 0x100001000, 0x1000, 0x1000, 0x1000, 0x7, 0x3, 0x3, 0x0}, + &SegmentHeader{LoadCmdSegment64, 0x48, "__LINKEDIT", 0x100002000, 0x1000, 0x2000, 0x140, 0x7, 0x1, 0x0, 0x0}, + nil, // LC_SYMTAB + nil, // LC_DYSYMTAB + nil, // LC_LOAD_DYLINKER + nil, // LC_UUID + nil, // LC_UNIXTHREAD + &Dylib{nil, "/usr/lib/libgcc_s.1.dylib", 0x2, 0x10000, 0x10000}, + &Dylib{nil, "/usr/lib/libSystem.B.dylib", 0x2, 0x6f0104, 0x10000}, + }, + []*SectionHeader{ + {"__text", "__TEXT", 0x100000f14, 0x6d, 0xf14, 0x2, 0x0, 0x0, 0x80000400}, + {"__symbol_stub1", "__TEXT", 0x100000f81, 0xc, 0xf81, 0x0, 0x0, 0x0, 0x80000408}, + {"__stub_helper", "__TEXT", 0x100000f90, 0x18, 0xf90, 0x2, 0x0, 0x0, 0x0}, + {"__cstring", "__TEXT", 0x100000fa8, 0xd, 0xfa8, 0x0, 0x0, 0x0, 0x2}, + {"__eh_frame", "__TEXT", 0x100000fb8, 0x48, 0xfb8, 0x3, 0x0, 0x0, 0x6000000b}, + {"__data", "__DATA", 0x100001000, 0x1c, 0x1000, 0x3, 0x0, 0x0, 0x0}, + {"__dyld", "__DATA", 0x100001020, 0x38, 0x1020, 0x3, 0x0, 0x0, 0x0}, + {"__la_symbol_ptr", "__DATA", 0x100001058, 0x10, 0x1058, 0x2, 0x0, 0x0, 0x7}, + }, + nil, + }, + { + "testdata/gcc-amd64-darwin-exec-debug.base64", + FileHeader{0xfeedfacf, CpuAmd64, 0x80000003, 0xa, 0x4, 0x5a0, 0}, + []any{ + nil, // LC_UUID + &SegmentHeader{LoadCmdSegment64, 0x1d8, "__TEXT", 0x100000000, 0x1000, 0x0, 0x0, 0x7, 0x5, 0x5, 0x0}, + &SegmentHeader{LoadCmdSegment64, 0x138, "__DATA", 0x100001000, 0x1000, 0x0, 0x0, 0x7, 0x3, 0x3, 0x0}, + &SegmentHeader{LoadCmdSegment64, 0x278, "__DWARF", 0x100002000, 0x1000, 0x1000, 0x1bc, 0x7, 0x3, 0x7, 0x0}, + }, + []*SectionHeader{ + {"__text", "__TEXT", 0x100000f14, 0x0, 0x0, 0x2, 0x0, 0x0, 0x80000400}, + {"__symbol_stub1", "__TEXT", 0x100000f81, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80000408}, + {"__stub_helper", "__TEXT", 0x100000f90, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0}, + {"__cstring", "__TEXT", 0x100000fa8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2}, + {"__eh_frame", "__TEXT", 0x100000fb8, 0x0, 0x0, 0x3, 0x0, 0x0, 0x6000000b}, + {"__data", "__DATA", 0x100001000, 0x0, 0x0, 0x3, 0x0, 0x0, 0x0}, + {"__dyld", "__DATA", 0x100001020, 0x0, 0x0, 0x3, 0x0, 0x0, 0x0}, + {"__la_symbol_ptr", "__DATA", 0x100001058, 0x0, 0x0, 0x2, 0x0, 0x0, 0x7}, + {"__debug_abbrev", "__DWARF", 0x100002000, 0x36, 0x1000, 0x0, 0x0, 0x0, 0x0}, + {"__debug_aranges", "__DWARF", 0x100002036, 0x30, 0x1036, 0x0, 0x0, 0x0, 0x0}, + {"__debug_frame", "__DWARF", 0x100002066, 0x40, 0x1066, 0x0, 0x0, 0x0, 0x0}, + {"__debug_info", "__DWARF", 0x1000020a6, 0x54, 0x10a6, 0x0, 0x0, 0x0, 0x0}, + {"__debug_line", "__DWARF", 0x1000020fa, 0x47, 0x10fa, 0x0, 0x0, 0x0, 0x0}, + {"__debug_pubnames", "__DWARF", 0x100002141, 0x1b, 0x1141, 0x0, 0x0, 0x0, 0x0}, + {"__debug_str", "__DWARF", 0x10000215c, 0x60, 0x115c, 0x0, 0x0, 0x0, 0x0}, + }, + nil, + }, + { + "testdata/clang-386-darwin-exec-with-rpath.base64", + FileHeader{0xfeedface, Cpu386, 0x3, 0x2, 0x10, 0x42c, 0x1200085}, + []any{ + nil, // LC_SEGMENT + nil, // LC_SEGMENT + nil, // LC_SEGMENT + nil, // LC_SEGMENT + nil, // LC_DYLD_INFO_ONLY + nil, // LC_SYMTAB + nil, // LC_DYSYMTAB + nil, // LC_LOAD_DYLINKER + nil, // LC_UUID + nil, // LC_VERSION_MIN_MACOSX + nil, // LC_SOURCE_VERSION + nil, // LC_MAIN + nil, // LC_LOAD_DYLIB + &Rpath{nil, "/my/rpath"}, + nil, // LC_FUNCTION_STARTS + nil, // LC_DATA_IN_CODE + }, + nil, + nil, + }, + { + "testdata/clang-amd64-darwin-exec-with-rpath.base64", + FileHeader{0xfeedfacf, CpuAmd64, 0x80000003, 0x2, 0x10, 0x4c8, 0x200085}, + []any{ + nil, // LC_SEGMENT + nil, // LC_SEGMENT + nil, // LC_SEGMENT + nil, // LC_SEGMENT + nil, // LC_DYLD_INFO_ONLY + nil, // LC_SYMTAB + nil, // LC_DYSYMTAB + nil, // LC_LOAD_DYLINKER + nil, // LC_UUID + nil, // LC_VERSION_MIN_MACOSX + nil, // LC_SOURCE_VERSION + nil, // LC_MAIN + nil, // LC_LOAD_DYLIB + &Rpath{nil, "/my/rpath"}, + nil, // LC_FUNCTION_STARTS + nil, // LC_DATA_IN_CODE + }, + nil, + nil, + }, + { + "testdata/clang-386-darwin.obj.base64", + FileHeader{0xfeedface, Cpu386, 0x3, 0x1, 0x4, 0x138, 0x2000}, + nil, + nil, + map[string][]Reloc{ + "__text": { + { + Addr: 0x1d, + Type: uint8(GENERIC_RELOC_VANILLA), + Len: 2, + Pcrel: true, + Extern: true, + Value: 1, + Scattered: false, + }, + { + Addr: 0xe, + Type: uint8(GENERIC_RELOC_LOCAL_SECTDIFF), + Len: 2, + Pcrel: false, + Value: 0x2d, + Scattered: true, + }, + { + Addr: 0x0, + Type: uint8(GENERIC_RELOC_PAIR), + Len: 2, + Pcrel: false, + Value: 0xb, + Scattered: true, + }, + }, + }, + }, + { + "testdata/clang-amd64-darwin.obj.base64", + FileHeader{0xfeedfacf, CpuAmd64, 0x3, 0x1, 0x4, 0x200, 0x2000}, + nil, + nil, + map[string][]Reloc{ + "__text": { + { + Addr: 0x19, + Type: uint8(X86_64_RELOC_BRANCH), + Len: 2, + Pcrel: true, + Extern: true, + Value: 1, + }, + { + Addr: 0xb, + Type: uint8(X86_64_RELOC_SIGNED), + Len: 2, + Pcrel: true, + Extern: false, + Value: 2, + }, + }, + "__compact_unwind": { + { + Addr: 0x0, + Type: uint8(X86_64_RELOC_UNSIGNED), + Len: 3, + Pcrel: false, + Extern: false, + Value: 1, + }, + }, + }, + }, +} + +func readerAtFromObscured(name string) (io.ReaderAt, error) { + b, err := obscuretestdata.ReadFile(name) + if err != nil { + return nil, err + } + return bytes.NewReader(b), nil +} + +func openObscured(name string) (*File, error) { + ra, err := readerAtFromObscured(name) + if err != nil { + return nil, err + } + ff, err := NewFile(ra) + if err != nil { + return nil, err + } + return ff, nil +} + +func openFatObscured(name string) (*FatFile, error) { + ra, err := readerAtFromObscured(name) + if err != nil { + return nil, err + } + ff, err := NewFatFile(ra) + if err != nil { + return nil, err + } + return ff, nil +} + +func TestOpen(t *testing.T) { + for i := range fileTests { + tt := &fileTests[i] + + // Use obscured files to prevent Apple’s notarization service from + // mistaking them as candidates for notarization and rejecting the entire + // toolchain. + // See golang.org/issue/34986 + f, err := openObscured(tt.file) + if err != nil { + t.Error(err) + continue + } + if !reflect.DeepEqual(f.FileHeader, tt.hdr) { + t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr) + continue + } + for i, l := range f.Loads { + if len(l.Raw()) < 8 { + t.Errorf("open %s, command %d:\n\tload command %T don't have enough data\n", tt.file, i, l) + } + } + if tt.loads != nil { + for i, l := range f.Loads { + if i >= len(tt.loads) { + break + } + + want := tt.loads[i] + if want == nil { + continue + } + + switch l := l.(type) { + case *Segment: + have := &l.SegmentHeader + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, command %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + case *Dylib: + have := l + have.LoadBytes = nil + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, command %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + case *Rpath: + have := l + have.LoadBytes = nil + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, command %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + default: + t.Errorf("open %s, command %d: unknown load command\n\thave %#v\n\twant %#v\n", tt.file, i, l, want) + } + } + tn := len(tt.loads) + fn := len(f.Loads) + if tn != fn { + t.Errorf("open %s: len(Loads) = %d, want %d", tt.file, fn, tn) + } + } + + if tt.sections != nil { + for i, sh := range f.Sections { + if i >= len(tt.sections) { + break + } + have := &sh.SectionHeader + want := tt.sections[i] + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + } + tn := len(tt.sections) + fn := len(f.Sections) + if tn != fn { + t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn) + } + } + + if tt.relocations != nil { + for i, sh := range f.Sections { + have := sh.Relocs + want := tt.relocations[sh.Name] + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, relocations in section %d (%s):\n\thave %#v\n\twant %#v\n", tt.file, i, sh.Name, have, want) + } + } + } + } +} + +func TestOpenFailure(t *testing.T) { + filename := "file.go" // not a Mach-O file + _, err := Open(filename) // don't crash + if err == nil { + t.Errorf("open %s: succeeded unexpectedly", filename) + } +} + +func TestOpenFat(t *testing.T) { + ff, err := openFatObscured("testdata/fat-gcc-386-amd64-darwin-exec.base64") + if err != nil { + t.Fatal(err) + } + + if ff.Magic != MagicFat { + t.Errorf("OpenFat: got magic number %#x, want %#x", ff.Magic, MagicFat) + } + if len(ff.Arches) != 2 { + t.Errorf("OpenFat: got %d architectures, want 2", len(ff.Arches)) + } + + for i := range ff.Arches { + arch := &ff.Arches[i] + ftArch := &fileTests[i] + + if arch.Cpu != ftArch.hdr.Cpu || arch.SubCpu != ftArch.hdr.SubCpu { + t.Errorf("OpenFat: architecture #%d got cpu=%#x subtype=%#x, expected cpu=%#x, subtype=%#x", i, arch.Cpu, arch.SubCpu, ftArch.hdr.Cpu, ftArch.hdr.SubCpu) + } + + if !reflect.DeepEqual(arch.FileHeader, ftArch.hdr) { + t.Errorf("OpenFat header:\n\tgot %#v\n\twant %#v\n", arch.FileHeader, ftArch.hdr) + } + } +} + +func TestOpenFatFailure(t *testing.T) { + filename := "file.go" // not a Mach-O file + if _, err := OpenFat(filename); err == nil { + t.Errorf("OpenFat %s: succeeded unexpectedly", filename) + } + + filename = "testdata/gcc-386-darwin-exec.base64" // not a fat Mach-O + ff, err := openFatObscured(filename) + if err != ErrNotFat { + t.Errorf("OpenFat %s: got %v, want ErrNotFat", filename, err) + } + if ff != nil { + t.Errorf("OpenFat %s: got %v, want nil", filename, ff) + } +} + +func TestRelocTypeString(t *testing.T) { + if X86_64_RELOC_BRANCH.String() != "X86_64_RELOC_BRANCH" { + t.Errorf("got %v, want %v", X86_64_RELOC_BRANCH.String(), "X86_64_RELOC_BRANCH") + } + if X86_64_RELOC_BRANCH.GoString() != "macho.X86_64_RELOC_BRANCH" { + t.Errorf("got %v, want %v", X86_64_RELOC_BRANCH.GoString(), "macho.X86_64_RELOC_BRANCH") + } +} + +func TestTypeString(t *testing.T) { + if TypeExec.String() != "Exec" { + t.Errorf("got %v, want %v", TypeExec.String(), "Exec") + } + if TypeExec.GoString() != "macho.Exec" { + t.Errorf("got %v, want %v", TypeExec.GoString(), "macho.Exec") + } +} + +func TestOpenBadDysymCmd(t *testing.T) { + _, err := openObscured("testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64") + if err == nil { + t.Fatal("openObscured did not fail when opening a file with an invalid dynamic symbol table command") + } +} diff --git a/src/debug/macho/macho.go b/src/debug/macho/macho.go new file mode 100644 index 0000000..9fa9f95 --- /dev/null +++ b/src/debug/macho/macho.go @@ -0,0 +1,341 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Mach-O header data structures +// Originally at: +// http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html (since deleted by Apple) +// Archived copy at: +// https://web.archive.org/web/20090819232456/http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachORuntime/index.html +// For cloned PDF see: +// https://github.com/aidansteele/osx-abi-macho-file-format-reference + +package macho + +import "strconv" + +// A FileHeader represents a Mach-O file header. +type FileHeader struct { + Magic uint32 + Cpu Cpu + SubCpu uint32 + Type Type + Ncmd uint32 + Cmdsz uint32 + Flags uint32 +} + +const ( + fileHeaderSize32 = 7 * 4 + fileHeaderSize64 = 8 * 4 +) + +const ( + Magic32 uint32 = 0xfeedface + Magic64 uint32 = 0xfeedfacf + MagicFat uint32 = 0xcafebabe +) + +// A Type is the Mach-O file type, e.g. an object file, executable, or dynamic library. +type Type uint32 + +const ( + TypeObj Type = 1 + TypeExec Type = 2 + TypeDylib Type = 6 + TypeBundle Type = 8 +) + +var typeStrings = []intName{ + {uint32(TypeObj), "Obj"}, + {uint32(TypeExec), "Exec"}, + {uint32(TypeDylib), "Dylib"}, + {uint32(TypeBundle), "Bundle"}, +} + +func (t Type) String() string { return stringName(uint32(t), typeStrings, false) } +func (t Type) GoString() string { return stringName(uint32(t), typeStrings, true) } + +// A Cpu is a Mach-O cpu type. +type Cpu uint32 + +const cpuArch64 = 0x01000000 + +const ( + Cpu386 Cpu = 7 + CpuAmd64 Cpu = Cpu386 | cpuArch64 + CpuArm Cpu = 12 + CpuArm64 Cpu = CpuArm | cpuArch64 + CpuPpc Cpu = 18 + CpuPpc64 Cpu = CpuPpc | cpuArch64 +) + +var cpuStrings = []intName{ + {uint32(Cpu386), "Cpu386"}, + {uint32(CpuAmd64), "CpuAmd64"}, + {uint32(CpuArm), "CpuArm"}, + {uint32(CpuArm64), "CpuArm64"}, + {uint32(CpuPpc), "CpuPpc"}, + {uint32(CpuPpc64), "CpuPpc64"}, +} + +func (i Cpu) String() string { return stringName(uint32(i), cpuStrings, false) } +func (i Cpu) GoString() string { return stringName(uint32(i), cpuStrings, true) } + +// A LoadCmd is a Mach-O load command. +type LoadCmd uint32 + +const ( + LoadCmdSegment LoadCmd = 0x1 + LoadCmdSymtab LoadCmd = 0x2 + LoadCmdThread LoadCmd = 0x4 + LoadCmdUnixThread LoadCmd = 0x5 // thread+stack + LoadCmdDysymtab LoadCmd = 0xb + LoadCmdDylib LoadCmd = 0xc // load dylib command + LoadCmdDylinker LoadCmd = 0xf // id dylinker command (not load dylinker command) + LoadCmdSegment64 LoadCmd = 0x19 + LoadCmdRpath LoadCmd = 0x8000001c +) + +var cmdStrings = []intName{ + {uint32(LoadCmdSegment), "LoadCmdSegment"}, + {uint32(LoadCmdThread), "LoadCmdThread"}, + {uint32(LoadCmdUnixThread), "LoadCmdUnixThread"}, + {uint32(LoadCmdDylib), "LoadCmdDylib"}, + {uint32(LoadCmdSegment64), "LoadCmdSegment64"}, + {uint32(LoadCmdRpath), "LoadCmdRpath"}, +} + +func (i LoadCmd) String() string { return stringName(uint32(i), cmdStrings, false) } +func (i LoadCmd) GoString() string { return stringName(uint32(i), cmdStrings, true) } + +type ( + // A Segment32 is a 32-bit Mach-O segment load command. + Segment32 struct { + Cmd LoadCmd + Len uint32 + Name [16]byte + Addr uint32 + Memsz uint32 + Offset uint32 + Filesz uint32 + Maxprot uint32 + Prot uint32 + Nsect uint32 + Flag uint32 + } + + // A Segment64 is a 64-bit Mach-O segment load command. + Segment64 struct { + Cmd LoadCmd + Len uint32 + Name [16]byte + Addr uint64 + Memsz uint64 + Offset uint64 + Filesz uint64 + Maxprot uint32 + Prot uint32 + Nsect uint32 + Flag uint32 + } + + // A SymtabCmd is a Mach-O symbol table command. + SymtabCmd struct { + Cmd LoadCmd + Len uint32 + Symoff uint32 + Nsyms uint32 + Stroff uint32 + Strsize uint32 + } + + // A DysymtabCmd is a Mach-O dynamic symbol table command. + DysymtabCmd struct { + Cmd LoadCmd + Len uint32 + Ilocalsym uint32 + Nlocalsym uint32 + Iextdefsym uint32 + Nextdefsym uint32 + Iundefsym uint32 + Nundefsym uint32 + Tocoffset uint32 + Ntoc uint32 + Modtaboff uint32 + Nmodtab uint32 + Extrefsymoff uint32 + Nextrefsyms uint32 + Indirectsymoff uint32 + Nindirectsyms uint32 + Extreloff uint32 + Nextrel uint32 + Locreloff uint32 + Nlocrel uint32 + } + + // A DylibCmd is a Mach-O load dynamic library command. + DylibCmd struct { + Cmd LoadCmd + Len uint32 + Name uint32 + Time uint32 + CurrentVersion uint32 + CompatVersion uint32 + } + + // A RpathCmd is a Mach-O rpath command. + RpathCmd struct { + Cmd LoadCmd + Len uint32 + Path uint32 + } + + // A Thread is a Mach-O thread state command. + Thread struct { + Cmd LoadCmd + Len uint32 + Type uint32 + Data []uint32 + } +) + +const ( + FlagNoUndefs uint32 = 0x1 + FlagIncrLink uint32 = 0x2 + FlagDyldLink uint32 = 0x4 + FlagBindAtLoad uint32 = 0x8 + FlagPrebound uint32 = 0x10 + FlagSplitSegs uint32 = 0x20 + FlagLazyInit uint32 = 0x40 + FlagTwoLevel uint32 = 0x80 + FlagForceFlat uint32 = 0x100 + FlagNoMultiDefs uint32 = 0x200 + FlagNoFixPrebinding uint32 = 0x400 + FlagPrebindable uint32 = 0x800 + FlagAllModsBound uint32 = 0x1000 + FlagSubsectionsViaSymbols uint32 = 0x2000 + FlagCanonical uint32 = 0x4000 + FlagWeakDefines uint32 = 0x8000 + FlagBindsToWeak uint32 = 0x10000 + FlagAllowStackExecution uint32 = 0x20000 + FlagRootSafe uint32 = 0x40000 + FlagSetuidSafe uint32 = 0x80000 + FlagNoReexportedDylibs uint32 = 0x100000 + FlagPIE uint32 = 0x200000 + FlagDeadStrippableDylib uint32 = 0x400000 + FlagHasTLVDescriptors uint32 = 0x800000 + FlagNoHeapExecution uint32 = 0x1000000 + FlagAppExtensionSafe uint32 = 0x2000000 +) + +// A Section32 is a 32-bit Mach-O section header. +type Section32 struct { + Name [16]byte + Seg [16]byte + Addr uint32 + Size uint32 + Offset uint32 + Align uint32 + Reloff uint32 + Nreloc uint32 + Flags uint32 + Reserve1 uint32 + Reserve2 uint32 +} + +// A Section64 is a 64-bit Mach-O section header. +type Section64 struct { + Name [16]byte + Seg [16]byte + Addr uint64 + Size uint64 + Offset uint32 + Align uint32 + Reloff uint32 + Nreloc uint32 + Flags uint32 + Reserve1 uint32 + Reserve2 uint32 + Reserve3 uint32 +} + +// An Nlist32 is a Mach-O 32-bit symbol table entry. +type Nlist32 struct { + Name uint32 + Type uint8 + Sect uint8 + Desc uint16 + Value uint32 +} + +// An Nlist64 is a Mach-O 64-bit symbol table entry. +type Nlist64 struct { + Name uint32 + Type uint8 + Sect uint8 + Desc uint16 + Value uint64 +} + +// Regs386 is the Mach-O 386 register structure. +type Regs386 struct { + AX uint32 + BX uint32 + CX uint32 + DX uint32 + DI uint32 + SI uint32 + BP uint32 + SP uint32 + SS uint32 + FLAGS uint32 + IP uint32 + CS uint32 + DS uint32 + ES uint32 + FS uint32 + GS uint32 +} + +// RegsAMD64 is the Mach-O AMD64 register structure. +type RegsAMD64 struct { + AX uint64 + BX uint64 + CX uint64 + DX uint64 + DI uint64 + SI uint64 + BP uint64 + SP uint64 + R8 uint64 + R9 uint64 + R10 uint64 + R11 uint64 + R12 uint64 + R13 uint64 + R14 uint64 + R15 uint64 + IP uint64 + FLAGS uint64 + CS uint64 + FS uint64 + GS uint64 +} + +type intName struct { + i uint32 + s string +} + +func stringName(i uint32, names []intName, goSyntax bool) string { + for _, n := range names { + if n.i == i { + if goSyntax { + return "macho." + n.s + } + return n.s + } + } + return strconv.FormatUint(uint64(i), 10) +} diff --git a/src/debug/macho/reloctype.go b/src/debug/macho/reloctype.go new file mode 100644 index 0000000..496dfce --- /dev/null +++ b/src/debug/macho/reloctype.go @@ -0,0 +1,72 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package macho + +//go:generate stringer -type=RelocTypeGeneric,RelocTypeX86_64,RelocTypeARM,RelocTypeARM64 -output reloctype_string.go + +type RelocTypeGeneric int + +const ( + GENERIC_RELOC_VANILLA RelocTypeGeneric = 0 + GENERIC_RELOC_PAIR RelocTypeGeneric = 1 + GENERIC_RELOC_SECTDIFF RelocTypeGeneric = 2 + GENERIC_RELOC_PB_LA_PTR RelocTypeGeneric = 3 + GENERIC_RELOC_LOCAL_SECTDIFF RelocTypeGeneric = 4 + GENERIC_RELOC_TLV RelocTypeGeneric = 5 +) + +func (r RelocTypeGeneric) GoString() string { return "macho." + r.String() } + +type RelocTypeX86_64 int + +const ( + X86_64_RELOC_UNSIGNED RelocTypeX86_64 = 0 + X86_64_RELOC_SIGNED RelocTypeX86_64 = 1 + X86_64_RELOC_BRANCH RelocTypeX86_64 = 2 + X86_64_RELOC_GOT_LOAD RelocTypeX86_64 = 3 + X86_64_RELOC_GOT RelocTypeX86_64 = 4 + X86_64_RELOC_SUBTRACTOR RelocTypeX86_64 = 5 + X86_64_RELOC_SIGNED_1 RelocTypeX86_64 = 6 + X86_64_RELOC_SIGNED_2 RelocTypeX86_64 = 7 + X86_64_RELOC_SIGNED_4 RelocTypeX86_64 = 8 + X86_64_RELOC_TLV RelocTypeX86_64 = 9 +) + +func (r RelocTypeX86_64) GoString() string { return "macho." + r.String() } + +type RelocTypeARM int + +const ( + ARM_RELOC_VANILLA RelocTypeARM = 0 + ARM_RELOC_PAIR RelocTypeARM = 1 + ARM_RELOC_SECTDIFF RelocTypeARM = 2 + ARM_RELOC_LOCAL_SECTDIFF RelocTypeARM = 3 + ARM_RELOC_PB_LA_PTR RelocTypeARM = 4 + ARM_RELOC_BR24 RelocTypeARM = 5 + ARM_THUMB_RELOC_BR22 RelocTypeARM = 6 + ARM_THUMB_32BIT_BRANCH RelocTypeARM = 7 + ARM_RELOC_HALF RelocTypeARM = 8 + ARM_RELOC_HALF_SECTDIFF RelocTypeARM = 9 +) + +func (r RelocTypeARM) GoString() string { return "macho." + r.String() } + +type RelocTypeARM64 int + +const ( + ARM64_RELOC_UNSIGNED RelocTypeARM64 = 0 + ARM64_RELOC_SUBTRACTOR RelocTypeARM64 = 1 + ARM64_RELOC_BRANCH26 RelocTypeARM64 = 2 + ARM64_RELOC_PAGE21 RelocTypeARM64 = 3 + ARM64_RELOC_PAGEOFF12 RelocTypeARM64 = 4 + ARM64_RELOC_GOT_LOAD_PAGE21 RelocTypeARM64 = 5 + ARM64_RELOC_GOT_LOAD_PAGEOFF12 RelocTypeARM64 = 6 + ARM64_RELOC_POINTER_TO_GOT RelocTypeARM64 = 7 + ARM64_RELOC_TLVP_LOAD_PAGE21 RelocTypeARM64 = 8 + ARM64_RELOC_TLVP_LOAD_PAGEOFF12 RelocTypeARM64 = 9 + ARM64_RELOC_ADDEND RelocTypeARM64 = 10 +) + +func (r RelocTypeARM64) GoString() string { return "macho." + r.String() } diff --git a/src/debug/macho/reloctype_string.go b/src/debug/macho/reloctype_string.go new file mode 100644 index 0000000..9c2b131 --- /dev/null +++ b/src/debug/macho/reloctype_string.go @@ -0,0 +1,49 @@ +// Code generated by "stringer -type=RelocTypeGeneric,RelocTypeX86_64,RelocTypeARM,RelocTypeARM64 -output reloctype_string.go"; DO NOT EDIT. + +package macho + +import "strconv" + +const _RelocTypeGeneric_name = "GENERIC_RELOC_VANILLAGENERIC_RELOC_PAIRGENERIC_RELOC_SECTDIFFGENERIC_RELOC_PB_LA_PTRGENERIC_RELOC_LOCAL_SECTDIFFGENERIC_RELOC_TLV" + +var _RelocTypeGeneric_index = [...]uint8{0, 21, 39, 61, 84, 112, 129} + +func (i RelocTypeGeneric) String() string { + if i < 0 || i >= RelocTypeGeneric(len(_RelocTypeGeneric_index)-1) { + return "RelocTypeGeneric(" + strconv.FormatInt(int64(i), 10) + ")" + } + return _RelocTypeGeneric_name[_RelocTypeGeneric_index[i]:_RelocTypeGeneric_index[i+1]] +} + +const _RelocTypeX86_64_name = "X86_64_RELOC_UNSIGNEDX86_64_RELOC_SIGNEDX86_64_RELOC_BRANCHX86_64_RELOC_GOT_LOADX86_64_RELOC_GOTX86_64_RELOC_SUBTRACTORX86_64_RELOC_SIGNED_1X86_64_RELOC_SIGNED_2X86_64_RELOC_SIGNED_4X86_64_RELOC_TLV" + +var _RelocTypeX86_64_index = [...]uint8{0, 21, 40, 59, 80, 96, 119, 140, 161, 182, 198} + +func (i RelocTypeX86_64) String() string { + if i < 0 || i >= RelocTypeX86_64(len(_RelocTypeX86_64_index)-1) { + return "RelocTypeX86_64(" + strconv.FormatInt(int64(i), 10) + ")" + } + return _RelocTypeX86_64_name[_RelocTypeX86_64_index[i]:_RelocTypeX86_64_index[i+1]] +} + +const _RelocTypeARM_name = "ARM_RELOC_VANILLAARM_RELOC_PAIRARM_RELOC_SECTDIFFARM_RELOC_LOCAL_SECTDIFFARM_RELOC_PB_LA_PTRARM_RELOC_BR24ARM_THUMB_RELOC_BR22ARM_THUMB_32BIT_BRANCHARM_RELOC_HALFARM_RELOC_HALF_SECTDIFF" + +var _RelocTypeARM_index = [...]uint8{0, 17, 31, 49, 73, 92, 106, 126, 148, 162, 185} + +func (i RelocTypeARM) String() string { + if i < 0 || i >= RelocTypeARM(len(_RelocTypeARM_index)-1) { + return "RelocTypeARM(" + strconv.FormatInt(int64(i), 10) + ")" + } + return _RelocTypeARM_name[_RelocTypeARM_index[i]:_RelocTypeARM_index[i+1]] +} + +const _RelocTypeARM64_name = "ARM64_RELOC_UNSIGNEDARM64_RELOC_SUBTRACTORARM64_RELOC_BRANCH26ARM64_RELOC_PAGE21ARM64_RELOC_PAGEOFF12ARM64_RELOC_GOT_LOAD_PAGE21ARM64_RELOC_GOT_LOAD_PAGEOFF12ARM64_RELOC_POINTER_TO_GOTARM64_RELOC_TLVP_LOAD_PAGE21ARM64_RELOC_TLVP_LOAD_PAGEOFF12ARM64_RELOC_ADDEND" + +var _RelocTypeARM64_index = [...]uint16{0, 20, 42, 62, 80, 101, 128, 158, 184, 212, 243, 261} + +func (i RelocTypeARM64) String() string { + if i < 0 || i >= RelocTypeARM64(len(_RelocTypeARM64_index)-1) { + return "RelocTypeARM64(" + strconv.FormatInt(int64(i), 10) + ")" + } + return _RelocTypeARM64_name[_RelocTypeARM64_index[i]:_RelocTypeARM64_index[i+1]] +} diff --git a/src/debug/macho/testdata/clang-386-darwin-exec-with-rpath.base64 b/src/debug/macho/testdata/clang-386-darwin-exec-with-rpath.base64 new file mode 100644 index 0000000..64047f1 --- /dev/null +++ b/src/debug/macho/testdata/clang-386-darwin-exec-with-rpath.base64 @@ -0,0 +1 @@ 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diff --git a/src/debug/macho/testdata/hello.c b/src/debug/macho/testdata/hello.c new file mode 100644 index 0000000..a689d36 --- /dev/null +++ b/src/debug/macho/testdata/hello.c @@ -0,0 +1,8 @@ +#include <stdio.h> + +int +main(void) +{ + printf("hello, world\n"); + return 0; +} diff --git a/src/debug/pe/file.go b/src/debug/pe/file.go new file mode 100644 index 0000000..f8c922d --- /dev/null +++ b/src/debug/pe/file.go @@ -0,0 +1,630 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package pe implements access to PE (Microsoft Windows Portable Executable) files. + +# Security + +This package is not designed to be hardened against adversarial inputs, and is +outside the scope of https://go.dev/security/policy. In particular, only basic +validation is done when parsing object files. As such, care should be taken when +parsing untrusted inputs, as parsing malformed files may consume significant +resources, or cause panics. +*/ +package pe + +import ( + "bytes" + "compress/zlib" + "debug/dwarf" + "encoding/binary" + "fmt" + "io" + "os" + "strings" +) + +// Avoid use of post-Go 1.4 io features, to make safe for toolchain bootstrap. +const seekStart = 0 + +// A File represents an open PE file. +type File struct { + FileHeader + OptionalHeader any // of type *OptionalHeader32 or *OptionalHeader64 + Sections []*Section + Symbols []*Symbol // COFF symbols with auxiliary symbol records removed + COFFSymbols []COFFSymbol // all COFF symbols (including auxiliary symbol records) + StringTable StringTable + + closer io.Closer +} + +// Open opens the named file using os.Open and prepares it for use as a PE binary. +func Open(name string) (*File, error) { + f, err := os.Open(name) + if err != nil { + return nil, err + } + ff, err := NewFile(f) + if err != nil { + f.Close() + return nil, err + } + ff.closer = f + return ff, nil +} + +// Close closes the File. +// If the File was created using NewFile directly instead of Open, +// Close has no effect. +func (f *File) Close() error { + var err error + if f.closer != nil { + err = f.closer.Close() + f.closer = nil + } + return err +} + +// TODO(brainman): add Load function, as a replacement for NewFile, that does not call removeAuxSymbols (for performance) + +// NewFile creates a new File for accessing a PE binary in an underlying reader. +func NewFile(r io.ReaderAt) (*File, error) { + f := new(File) + sr := io.NewSectionReader(r, 0, 1<<63-1) + + var dosheader [96]byte + if _, err := r.ReadAt(dosheader[0:], 0); err != nil { + return nil, err + } + var base int64 + if dosheader[0] == 'M' && dosheader[1] == 'Z' { + signoff := int64(binary.LittleEndian.Uint32(dosheader[0x3c:])) + var sign [4]byte + r.ReadAt(sign[:], signoff) + if !(sign[0] == 'P' && sign[1] == 'E' && sign[2] == 0 && sign[3] == 0) { + return nil, fmt.Errorf("invalid PE file signature: % x", sign) + } + base = signoff + 4 + } else { + base = int64(0) + } + sr.Seek(base, seekStart) + if err := binary.Read(sr, binary.LittleEndian, &f.FileHeader); err != nil { + return nil, err + } + switch f.FileHeader.Machine { + case IMAGE_FILE_MACHINE_AMD64, + IMAGE_FILE_MACHINE_ARM64, + IMAGE_FILE_MACHINE_ARMNT, + IMAGE_FILE_MACHINE_I386, + IMAGE_FILE_MACHINE_RISCV32, + IMAGE_FILE_MACHINE_RISCV64, + IMAGE_FILE_MACHINE_RISCV128, + IMAGE_FILE_MACHINE_UNKNOWN: + // ok + default: + return nil, fmt.Errorf("unrecognized PE machine: %#x", f.FileHeader.Machine) + } + + var err error + + // Read string table. + f.StringTable, err = readStringTable(&f.FileHeader, sr) + if err != nil { + return nil, err + } + + // Read symbol table. + f.COFFSymbols, err = readCOFFSymbols(&f.FileHeader, sr) + if err != nil { + return nil, err + } + f.Symbols, err = removeAuxSymbols(f.COFFSymbols, f.StringTable) + if err != nil { + return nil, err + } + + // Seek past file header. + _, err = sr.Seek(base+int64(binary.Size(f.FileHeader)), seekStart) + if err != nil { + return nil, err + } + + // Read optional header. + f.OptionalHeader, err = readOptionalHeader(sr, f.FileHeader.SizeOfOptionalHeader) + if err != nil { + return nil, err + } + + // Process sections. + f.Sections = make([]*Section, f.FileHeader.NumberOfSections) + for i := 0; i < int(f.FileHeader.NumberOfSections); i++ { + sh := new(SectionHeader32) + if err := binary.Read(sr, binary.LittleEndian, sh); err != nil { + return nil, err + } + name, err := sh.fullName(f.StringTable) + if err != nil { + return nil, err + } + s := new(Section) + s.SectionHeader = SectionHeader{ + Name: name, + VirtualSize: sh.VirtualSize, + VirtualAddress: sh.VirtualAddress, + Size: sh.SizeOfRawData, + Offset: sh.PointerToRawData, + PointerToRelocations: sh.PointerToRelocations, + PointerToLineNumbers: sh.PointerToLineNumbers, + NumberOfRelocations: sh.NumberOfRelocations, + NumberOfLineNumbers: sh.NumberOfLineNumbers, + Characteristics: sh.Characteristics, + } + r2 := r + if sh.PointerToRawData == 0 { // .bss must have all 0s + r2 = zeroReaderAt{} + } + s.sr = io.NewSectionReader(r2, int64(s.SectionHeader.Offset), int64(s.SectionHeader.Size)) + s.ReaderAt = s.sr + f.Sections[i] = s + } + for i := range f.Sections { + var err error + f.Sections[i].Relocs, err = readRelocs(&f.Sections[i].SectionHeader, sr) + if err != nil { + return nil, err + } + } + + return f, nil +} + +// zeroReaderAt is ReaderAt that reads 0s. +type zeroReaderAt struct{} + +// ReadAt writes len(p) 0s into p. +func (w zeroReaderAt) ReadAt(p []byte, off int64) (n int, err error) { + for i := range p { + p[i] = 0 + } + return len(p), nil +} + +// getString extracts a string from symbol string table. +func getString(section []byte, start int) (string, bool) { + if start < 0 || start >= len(section) { + return "", false + } + + for end := start; end < len(section); end++ { + if section[end] == 0 { + return string(section[start:end]), true + } + } + return "", false +} + +// Section returns the first section with the given name, or nil if no such +// section exists. +func (f *File) Section(name string) *Section { + for _, s := range f.Sections { + if s.Name == name { + return s + } + } + return nil +} + +func (f *File) DWARF() (*dwarf.Data, error) { + dwarfSuffix := func(s *Section) string { + switch { + case strings.HasPrefix(s.Name, ".debug_"): + return s.Name[7:] + case strings.HasPrefix(s.Name, ".zdebug_"): + return s.Name[8:] + default: + return "" + } + + } + + // sectionData gets the data for s and checks its size. + sectionData := func(s *Section) ([]byte, error) { + b, err := s.Data() + if err != nil && uint32(len(b)) < s.Size { + return nil, err + } + + if 0 < s.VirtualSize && s.VirtualSize < s.Size { + b = b[:s.VirtualSize] + } + + if len(b) >= 12 && string(b[:4]) == "ZLIB" { + dlen := binary.BigEndian.Uint64(b[4:12]) + dbuf := make([]byte, dlen) + r, err := zlib.NewReader(bytes.NewBuffer(b[12:])) + if err != nil { + return nil, err + } + if _, err := io.ReadFull(r, dbuf); err != nil { + return nil, err + } + if err := r.Close(); err != nil { + return nil, err + } + b = dbuf + } + return b, nil + } + + // There are many other DWARF sections, but these + // are the ones the debug/dwarf package uses. + // Don't bother loading others. + var dat = map[string][]byte{"abbrev": nil, "info": nil, "str": nil, "line": nil, "ranges": nil} + for _, s := range f.Sections { + suffix := dwarfSuffix(s) + if suffix == "" { + continue + } + if _, ok := dat[suffix]; !ok { + continue + } + + b, err := sectionData(s) + if err != nil { + return nil, err + } + dat[suffix] = b + } + + d, err := dwarf.New(dat["abbrev"], nil, nil, dat["info"], dat["line"], nil, dat["ranges"], dat["str"]) + if err != nil { + return nil, err + } + + // Look for DWARF4 .debug_types sections and DWARF5 sections. + for i, s := range f.Sections { + suffix := dwarfSuffix(s) + if suffix == "" { + continue + } + if _, ok := dat[suffix]; ok { + // Already handled. + continue + } + + b, err := sectionData(s) + if err != nil { + return nil, err + } + + if suffix == "types" { + err = d.AddTypes(fmt.Sprintf("types-%d", i), b) + } else { + err = d.AddSection(".debug_"+suffix, b) + } + if err != nil { + return nil, err + } + } + + return d, nil +} + +// TODO(brainman): document ImportDirectory once we decide what to do with it. + +type ImportDirectory struct { + OriginalFirstThunk uint32 + TimeDateStamp uint32 + ForwarderChain uint32 + Name uint32 + FirstThunk uint32 + + dll string +} + +// ImportedSymbols returns the names of all symbols +// referred to by the binary f that are expected to be +// satisfied by other libraries at dynamic load time. +// It does not return weak symbols. +func (f *File) ImportedSymbols() ([]string, error) { + if f.OptionalHeader == nil { + return nil, nil + } + + _, pe64 := f.OptionalHeader.(*OptionalHeader64) + + // grab the number of data directory entries + var dd_length uint32 + if pe64 { + dd_length = f.OptionalHeader.(*OptionalHeader64).NumberOfRvaAndSizes + } else { + dd_length = f.OptionalHeader.(*OptionalHeader32).NumberOfRvaAndSizes + } + + // check that the length of data directory entries is large + // enough to include the imports directory. + if dd_length < IMAGE_DIRECTORY_ENTRY_IMPORT+1 { + return nil, nil + } + + // grab the import data directory entry + var idd DataDirectory + if pe64 { + idd = f.OptionalHeader.(*OptionalHeader64).DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] + } else { + idd = f.OptionalHeader.(*OptionalHeader32).DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT] + } + + // figure out which section contains the import directory table + var ds *Section + ds = nil + for _, s := range f.Sections { + // We are using distance between s.VirtualAddress and idd.VirtualAddress + // to avoid potential overflow of uint32 caused by addition of s.VirtualSize + // to s.VirtualAddress. + if s.VirtualAddress <= idd.VirtualAddress && idd.VirtualAddress-s.VirtualAddress < s.VirtualSize { + ds = s + break + } + } + + // didn't find a section, so no import libraries were found + if ds == nil { + return nil, nil + } + + d, err := ds.Data() + if err != nil { + return nil, err + } + + // seek to the virtual address specified in the import data directory + d = d[idd.VirtualAddress-ds.VirtualAddress:] + + // start decoding the import directory + var ida []ImportDirectory + for len(d) >= 20 { + var dt ImportDirectory + dt.OriginalFirstThunk = binary.LittleEndian.Uint32(d[0:4]) + dt.TimeDateStamp = binary.LittleEndian.Uint32(d[4:8]) + dt.ForwarderChain = binary.LittleEndian.Uint32(d[8:12]) + dt.Name = binary.LittleEndian.Uint32(d[12:16]) + dt.FirstThunk = binary.LittleEndian.Uint32(d[16:20]) + d = d[20:] + if dt.OriginalFirstThunk == 0 { + break + } + ida = append(ida, dt) + } + // TODO(brainman): this needs to be rewritten + // ds.Data() returns contents of section containing import table. Why store in variable called "names"? + // Why we are retrieving it second time? We already have it in "d", and it is not modified anywhere. + // getString does not extracts a string from symbol string table (as getString doco says). + // Why ds.Data() called again and again in the loop? + // Needs test before rewrite. + names, _ := ds.Data() + var all []string + for _, dt := range ida { + dt.dll, _ = getString(names, int(dt.Name-ds.VirtualAddress)) + d, _ = ds.Data() + // seek to OriginalFirstThunk + d = d[dt.OriginalFirstThunk-ds.VirtualAddress:] + for len(d) > 0 { + if pe64 { // 64bit + va := binary.LittleEndian.Uint64(d[0:8]) + d = d[8:] + if va == 0 { + break + } + if va&0x8000000000000000 > 0 { // is Ordinal + // TODO add dynimport ordinal support. + } else { + fn, _ := getString(names, int(uint32(va)-ds.VirtualAddress+2)) + all = append(all, fn+":"+dt.dll) + } + } else { // 32bit + va := binary.LittleEndian.Uint32(d[0:4]) + d = d[4:] + if va == 0 { + break + } + if va&0x80000000 > 0 { // is Ordinal + // TODO add dynimport ordinal support. + //ord := va&0x0000FFFF + } else { + fn, _ := getString(names, int(va-ds.VirtualAddress+2)) + all = append(all, fn+":"+dt.dll) + } + } + } + } + + return all, nil +} + +// ImportedLibraries returns the names of all libraries +// referred to by the binary f that are expected to be +// linked with the binary at dynamic link time. +func (f *File) ImportedLibraries() ([]string, error) { + // TODO + // cgo -dynimport don't use this for windows PE, so just return. + return nil, nil +} + +// FormatError is unused. +// The type is retained for compatibility. +type FormatError struct { +} + +func (e *FormatError) Error() string { + return "unknown error" +} + +// readOptionalHeader accepts a io.ReadSeeker pointing to optional header in the PE file +// and its size as seen in the file header. +// It parses the given size of bytes and returns optional header. It infers whether the +// bytes being parsed refer to 32 bit or 64 bit version of optional header. +func readOptionalHeader(r io.ReadSeeker, sz uint16) (any, error) { + // If optional header size is 0, return empty optional header. + if sz == 0 { + return nil, nil + } + + var ( + // First couple of bytes in option header state its type. + // We need to read them first to determine the type and + // validity of optional header. + ohMagic uint16 + ohMagicSz = binary.Size(ohMagic) + ) + + // If optional header size is greater than 0 but less than its magic size, return error. + if sz < uint16(ohMagicSz) { + return nil, fmt.Errorf("optional header size is less than optional header magic size") + } + + // read reads from io.ReadSeeke, r, into data. + var err error + read := func(data any) bool { + err = binary.Read(r, binary.LittleEndian, data) + return err == nil + } + + if !read(&ohMagic) { + return nil, fmt.Errorf("failure to read optional header magic: %v", err) + + } + + switch ohMagic { + case 0x10b: // PE32 + var ( + oh32 OptionalHeader32 + // There can be 0 or more data directories. So the minimum size of optional + // header is calculated by subtracting oh32.DataDirectory size from oh32 size. + oh32MinSz = binary.Size(oh32) - binary.Size(oh32.DataDirectory) + ) + + if sz < uint16(oh32MinSz) { + return nil, fmt.Errorf("optional header size(%d) is less minimum size (%d) of PE32 optional header", sz, oh32MinSz) + } + + // Init oh32 fields + oh32.Magic = ohMagic + if !read(&oh32.MajorLinkerVersion) || + !read(&oh32.MinorLinkerVersion) || + !read(&oh32.SizeOfCode) || + !read(&oh32.SizeOfInitializedData) || + !read(&oh32.SizeOfUninitializedData) || + !read(&oh32.AddressOfEntryPoint) || + !read(&oh32.BaseOfCode) || + !read(&oh32.BaseOfData) || + !read(&oh32.ImageBase) || + !read(&oh32.SectionAlignment) || + !read(&oh32.FileAlignment) || + !read(&oh32.MajorOperatingSystemVersion) || + !read(&oh32.MinorOperatingSystemVersion) || + !read(&oh32.MajorImageVersion) || + !read(&oh32.MinorImageVersion) || + !read(&oh32.MajorSubsystemVersion) || + !read(&oh32.MinorSubsystemVersion) || + !read(&oh32.Win32VersionValue) || + !read(&oh32.SizeOfImage) || + !read(&oh32.SizeOfHeaders) || + !read(&oh32.CheckSum) || + !read(&oh32.Subsystem) || + !read(&oh32.DllCharacteristics) || + !read(&oh32.SizeOfStackReserve) || + !read(&oh32.SizeOfStackCommit) || + !read(&oh32.SizeOfHeapReserve) || + !read(&oh32.SizeOfHeapCommit) || + !read(&oh32.LoaderFlags) || + !read(&oh32.NumberOfRvaAndSizes) { + return nil, fmt.Errorf("failure to read PE32 optional header: %v", err) + } + + dd, err := readDataDirectories(r, sz-uint16(oh32MinSz), oh32.NumberOfRvaAndSizes) + if err != nil { + return nil, err + } + + copy(oh32.DataDirectory[:], dd) + + return &oh32, nil + case 0x20b: // PE32+ + var ( + oh64 OptionalHeader64 + // There can be 0 or more data directories. So the minimum size of optional + // header is calculated by subtracting oh64.DataDirectory size from oh64 size. + oh64MinSz = binary.Size(oh64) - binary.Size(oh64.DataDirectory) + ) + + if sz < uint16(oh64MinSz) { + return nil, fmt.Errorf("optional header size(%d) is less minimum size (%d) for PE32+ optional header", sz, oh64MinSz) + } + + // Init oh64 fields + oh64.Magic = ohMagic + if !read(&oh64.MajorLinkerVersion) || + !read(&oh64.MinorLinkerVersion) || + !read(&oh64.SizeOfCode) || + !read(&oh64.SizeOfInitializedData) || + !read(&oh64.SizeOfUninitializedData) || + !read(&oh64.AddressOfEntryPoint) || + !read(&oh64.BaseOfCode) || + !read(&oh64.ImageBase) || + !read(&oh64.SectionAlignment) || + !read(&oh64.FileAlignment) || + !read(&oh64.MajorOperatingSystemVersion) || + !read(&oh64.MinorOperatingSystemVersion) || + !read(&oh64.MajorImageVersion) || + !read(&oh64.MinorImageVersion) || + !read(&oh64.MajorSubsystemVersion) || + !read(&oh64.MinorSubsystemVersion) || + !read(&oh64.Win32VersionValue) || + !read(&oh64.SizeOfImage) || + !read(&oh64.SizeOfHeaders) || + !read(&oh64.CheckSum) || + !read(&oh64.Subsystem) || + !read(&oh64.DllCharacteristics) || + !read(&oh64.SizeOfStackReserve) || + !read(&oh64.SizeOfStackCommit) || + !read(&oh64.SizeOfHeapReserve) || + !read(&oh64.SizeOfHeapCommit) || + !read(&oh64.LoaderFlags) || + !read(&oh64.NumberOfRvaAndSizes) { + return nil, fmt.Errorf("failure to read PE32+ optional header: %v", err) + } + + dd, err := readDataDirectories(r, sz-uint16(oh64MinSz), oh64.NumberOfRvaAndSizes) + if err != nil { + return nil, err + } + + copy(oh64.DataDirectory[:], dd) + + return &oh64, nil + default: + return nil, fmt.Errorf("optional header has unexpected Magic of 0x%x", ohMagic) + } +} + +// readDataDirectories accepts a io.ReadSeeker pointing to data directories in the PE file, +// its size and number of data directories as seen in optional header. +// It parses the given size of bytes and returns given number of data directories. +func readDataDirectories(r io.ReadSeeker, sz uint16, n uint32) ([]DataDirectory, error) { + ddSz := uint64(binary.Size(DataDirectory{})) + if uint64(sz) != uint64(n)*ddSz { + return nil, fmt.Errorf("size of data directories(%d) is inconsistent with number of data directories(%d)", sz, n) + } + + dd := make([]DataDirectory, n) + if err := binary.Read(r, binary.LittleEndian, dd); err != nil { + return nil, fmt.Errorf("failure to read data directories: %v", err) + } + + return dd, nil +} diff --git a/src/debug/pe/file_cgo_test.go b/src/debug/pe/file_cgo_test.go new file mode 100644 index 0000000..9280de1 --- /dev/null +++ b/src/debug/pe/file_cgo_test.go @@ -0,0 +1,35 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:build cgo + +package pe + +import ( + "os/exec" + "runtime" + "testing" +) + +func testCgoDWARF(t *testing.T, linktype int) { + if _, err := exec.LookPath("gcc"); err != nil { + t.Skip("skipping test: gcc is missing") + } + testDWARF(t, linktype) +} + +func TestDefaultLinkerDWARF(t *testing.T) { + testCgoDWARF(t, linkCgoDefault) +} + +func TestInternalLinkerDWARF(t *testing.T) { + if runtime.GOARCH == "arm64" { + t.Skip("internal linker disabled on windows/arm64") + } + testCgoDWARF(t, linkCgoInternal) +} + +func TestExternalLinkerDWARF(t *testing.T) { + testCgoDWARF(t, linkCgoExternal) +} diff --git a/src/debug/pe/file_test.go b/src/debug/pe/file_test.go new file mode 100644 index 0000000..5368e08 --- /dev/null +++ b/src/debug/pe/file_test.go @@ -0,0 +1,745 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package pe + +import ( + "bytes" + "debug/dwarf" + "internal/testenv" + "os" + "os/exec" + "path/filepath" + "reflect" + "regexp" + "runtime" + "strconv" + "testing" + "text/template" +) + +type fileTest struct { + file string + hdr FileHeader + opthdr any + sections []*SectionHeader + symbols []*Symbol + hasNoDwarfInfo bool +} + +var fileTests = []fileTest{ + { + file: "testdata/gcc-386-mingw-obj", + hdr: FileHeader{0x014c, 0x000c, 0x0, 0x64a, 0x1e, 0x0, 0x104}, + sections: []*SectionHeader{ + {".text", 0, 0, 36, 500, 1440, 0, 3, 0, 0x60300020}, + {".data", 0, 0, 0, 0, 0, 0, 0, 0, 3224371264}, + {".bss", 0, 0, 0, 0, 0, 0, 0, 0, 3224371328}, + {".debug_abbrev", 0, 0, 137, 536, 0, 0, 0, 0, 0x42100000}, + {".debug_info", 0, 0, 418, 673, 1470, 0, 7, 0, 1108344832}, + {".debug_line", 0, 0, 128, 1091, 1540, 0, 1, 0, 1108344832}, + {".rdata", 0, 0, 16, 1219, 0, 0, 0, 0, 1076887616}, + {".debug_frame", 0, 0, 52, 1235, 1550, 0, 2, 0, 1110441984}, + {".debug_loc", 0, 0, 56, 1287, 0, 0, 0, 0, 1108344832}, + {".debug_pubnames", 0, 0, 27, 1343, 1570, 0, 1, 0, 1108344832}, + {".debug_pubtypes", 0, 0, 38, 1370, 1580, 0, 1, 0, 1108344832}, + {".debug_aranges", 0, 0, 32, 1408, 1590, 0, 2, 0, 1108344832}, + }, + symbols: []*Symbol{ + {".file", 0x0, -2, 0x0, 0x67}, + {"_main", 0x0, 1, 0x20, 0x2}, + {".text", 0x0, 1, 0x0, 0x3}, + {".data", 0x0, 2, 0x0, 0x3}, + {".bss", 0x0, 3, 0x0, 0x3}, + {".debug_abbrev", 0x0, 4, 0x0, 0x3}, + {".debug_info", 0x0, 5, 0x0, 0x3}, + {".debug_line", 0x0, 6, 0x0, 0x3}, + {".rdata", 0x0, 7, 0x0, 0x3}, + {".debug_frame", 0x0, 8, 0x0, 0x3}, + {".debug_loc", 0x0, 9, 0x0, 0x3}, + {".debug_pubnames", 0x0, 10, 0x0, 0x3}, + {".debug_pubtypes", 0x0, 11, 0x0, 0x3}, + {".debug_aranges", 0x0, 12, 0x0, 0x3}, + {"___main", 0x0, 0, 0x20, 0x2}, + {"_puts", 0x0, 0, 0x20, 0x2}, + }, + }, + { + file: "testdata/gcc-386-mingw-exec", + hdr: FileHeader{0x014c, 0x000f, 0x4c6a1b60, 0x3c00, 0x282, 0xe0, 0x107}, + opthdr: &OptionalHeader32{ + 0x10b, 0x2, 0x38, 0xe00, 0x1a00, 0x200, 0x1160, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x10000, 0x400, 0x14abb, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10, + [16]DataDirectory{ + {0x0, 0x0}, + {0x5000, 0x3c8}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x7000, 0x18}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + }, + }, + sections: []*SectionHeader{ + {".text", 0xcd8, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060}, + {".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".rdata", 0x120, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040}, + {".bss", 0xdc, 0x4000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0400080}, + {".idata", 0x3c8, 0x5000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".CRT", 0x18, 0x6000, 0x200, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".tls", 0x20, 0x7000, 0x200, 0x1c00, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".debug_aranges", 0x20, 0x8000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + {".debug_pubnames", 0x51, 0x9000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + {".debug_pubtypes", 0x91, 0xa000, 0x200, 0x2200, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + {".debug_info", 0xe22, 0xb000, 0x1000, 0x2400, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + {".debug_abbrev", 0x157, 0xc000, 0x200, 0x3400, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + {".debug_line", 0x144, 0xd000, 0x200, 0x3600, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + {".debug_frame", 0x34, 0xe000, 0x200, 0x3800, 0x0, 0x0, 0x0, 0x0, 0x42300000}, + {".debug_loc", 0x38, 0xf000, 0x200, 0x3a00, 0x0, 0x0, 0x0, 0x0, 0x42100000}, + }, + }, + { + file: "testdata/gcc-386-mingw-no-symbols-exec", + hdr: FileHeader{0x14c, 0x8, 0x69676572, 0x0, 0x0, 0xe0, 0x30f}, + opthdr: &OptionalHeader32{0x10b, 0x2, 0x18, 0xe00, 0x1e00, 0x200, 0x1280, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x9000, 0x400, 0x5306, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10, + [16]DataDirectory{ + {0x0, 0x0}, + {0x6000, 0x378}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x8004, 0x18}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x60b8, 0x7c}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + }, + }, + sections: []*SectionHeader{ + {".text", 0xc64, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060}, + {".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".rdata", 0x134, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040}, + {".eh_fram", 0x3a0, 0x4000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0x40300040}, + {".bss", 0x60, 0x5000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0300080}, + {".idata", 0x378, 0x6000, 0x400, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".CRT", 0x18, 0x7000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".tls", 0x20, 0x8000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + }, + hasNoDwarfInfo: true, + }, + { + file: "testdata/gcc-amd64-mingw-obj", + hdr: FileHeader{0x8664, 0x6, 0x0, 0x198, 0x12, 0x0, 0x4}, + sections: []*SectionHeader{ + {".text", 0x0, 0x0, 0x30, 0x104, 0x15c, 0x0, 0x3, 0x0, 0x60500020}, + {".data", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500040}, + {".bss", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500080}, + {".rdata", 0x0, 0x0, 0x10, 0x134, 0x0, 0x0, 0x0, 0x0, 0x40500040}, + {".xdata", 0x0, 0x0, 0xc, 0x144, 0x0, 0x0, 0x0, 0x0, 0x40300040}, + {".pdata", 0x0, 0x0, 0xc, 0x150, 0x17a, 0x0, 0x3, 0x0, 0x40300040}, + }, + symbols: []*Symbol{ + {".file", 0x0, -2, 0x0, 0x67}, + {"main", 0x0, 1, 0x20, 0x2}, + {".text", 0x0, 1, 0x0, 0x3}, + {".data", 0x0, 2, 0x0, 0x3}, + {".bss", 0x0, 3, 0x0, 0x3}, + {".rdata", 0x0, 4, 0x0, 0x3}, + {".xdata", 0x0, 5, 0x0, 0x3}, + {".pdata", 0x0, 6, 0x0, 0x3}, + {"__main", 0x0, 0, 0x20, 0x2}, + {"puts", 0x0, 0, 0x20, 0x2}, + }, + hasNoDwarfInfo: true, + }, + { + file: "testdata/gcc-amd64-mingw-exec", + hdr: FileHeader{0x8664, 0x11, 0x53e4364f, 0x39600, 0x6fc, 0xf0, 0x27}, + opthdr: &OptionalHeader64{ + 0x20b, 0x2, 0x16, 0x6a00, 0x2400, 0x1600, 0x14e0, 0x1000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x0, 0x0, 0x5, 0x2, 0x0, 0x45000, 0x600, 0x46f19, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10, + [16]DataDirectory{ + {0x0, 0x0}, + {0xe000, 0x990}, + {0x0, 0x0}, + {0xa000, 0x498}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x10000, 0x28}, + {0x0, 0x0}, + {0x0, 0x0}, + {0xe254, 0x218}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + }}, + sections: []*SectionHeader{ + {".text", 0x6860, 0x1000, 0x6a00, 0x600, 0x0, 0x0, 0x0, 0x0, 0x60500020}, + {".data", 0xe0, 0x8000, 0x200, 0x7000, 0x0, 0x0, 0x0, 0x0, 0xc0500040}, + {".rdata", 0x6b0, 0x9000, 0x800, 0x7200, 0x0, 0x0, 0x0, 0x0, 0x40600040}, + {".pdata", 0x498, 0xa000, 0x600, 0x7a00, 0x0, 0x0, 0x0, 0x0, 0x40300040}, + {".xdata", 0x488, 0xb000, 0x600, 0x8000, 0x0, 0x0, 0x0, 0x0, 0x40300040}, + {".bss", 0x1410, 0xc000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0600080}, + {".idata", 0x990, 0xe000, 0xa00, 0x8600, 0x0, 0x0, 0x0, 0x0, 0xc0300040}, + {".CRT", 0x68, 0xf000, 0x200, 0x9000, 0x0, 0x0, 0x0, 0x0, 0xc0400040}, + {".tls", 0x48, 0x10000, 0x200, 0x9200, 0x0, 0x0, 0x0, 0x0, 0xc0600040}, + {".debug_aranges", 0x600, 0x11000, 0x600, 0x9400, 0x0, 0x0, 0x0, 0x0, 0x42500040}, + {".debug_info", 0x1316e, 0x12000, 0x13200, 0x9a00, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + {".debug_abbrev", 0x2ccb, 0x26000, 0x2e00, 0x1cc00, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + {".debug_line", 0x3c4d, 0x29000, 0x3e00, 0x1fa00, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + {".debug_frame", 0x18b8, 0x2d000, 0x1a00, 0x23800, 0x0, 0x0, 0x0, 0x0, 0x42400040}, + {".debug_str", 0x396, 0x2f000, 0x400, 0x25200, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + {".debug_loc", 0x13240, 0x30000, 0x13400, 0x25600, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + {".debug_ranges", 0xa70, 0x44000, 0xc00, 0x38a00, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + }, + }, + { + // testdata/vmlinuz-4.15.0-47-generic is a trimmed down version of Linux Kernel image. + // The original Linux Kernel image is about 8M and it is not recommended to add such a big binary file to the repo. + // Moreover only a very small portion of the original Kernel image was being parsed by debug/pe package. + // In order to identify this portion, the original image was first parsed by modified debug/pe package. + // Modification essentially communicated reader's positions before and after parsing. + // Finally, bytes between those positions where written to a separate file, + // generating trimmed down version Linux Kernel image used in this test case. + file: "testdata/vmlinuz-4.15.0-47-generic", + hdr: FileHeader{0x8664, 0x4, 0x0, 0x0, 0x1, 0xa0, 0x206}, + opthdr: &OptionalHeader64{ + 0x20b, 0x2, 0x14, 0x7c0590, 0x0, 0x168f870, 0x4680, 0x200, 0x0, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1e50000, 0x200, 0x7c3ab0, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x6, + [16]DataDirectory{ + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x7c07a0, 0x778}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + {0x0, 0x0}, + }}, + sections: []*SectionHeader{ + {".setup", 0x41e0, 0x200, 0x41e0, 0x200, 0x0, 0x0, 0x0, 0x0, 0x60500020}, + {".reloc", 0x20, 0x43e0, 0x20, 0x43e0, 0x0, 0x0, 0x0, 0x0, 0x42100040}, + {".text", 0x7bc390, 0x4400, 0x7bc390, 0x4400, 0x0, 0x0, 0x0, 0x0, 0x60500020}, + {".bss", 0x168f870, 0x7c0790, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc8000080}, + }, + hasNoDwarfInfo: true, + }, +} + +func isOptHdrEq(a, b any) bool { + switch va := a.(type) { + case *OptionalHeader32: + vb, ok := b.(*OptionalHeader32) + if !ok { + return false + } + return *vb == *va + case *OptionalHeader64: + vb, ok := b.(*OptionalHeader64) + if !ok { + return false + } + return *vb == *va + case nil: + return b == nil + } + return false +} + +func TestOpen(t *testing.T) { + for i := range fileTests { + tt := &fileTests[i] + + f, err := Open(tt.file) + if err != nil { + t.Error(err) + continue + } + if !reflect.DeepEqual(f.FileHeader, tt.hdr) { + t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr) + continue + } + if !isOptHdrEq(tt.opthdr, f.OptionalHeader) { + t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.OptionalHeader, tt.opthdr) + continue + } + + for i, sh := range f.Sections { + if i >= len(tt.sections) { + break + } + have := &sh.SectionHeader + want := tt.sections[i] + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + } + tn := len(tt.sections) + fn := len(f.Sections) + if tn != fn { + t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn) + } + for i, have := range f.Symbols { + if i >= len(tt.symbols) { + break + } + want := tt.symbols[i] + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, symbol %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + } + if !tt.hasNoDwarfInfo { + _, err = f.DWARF() + if err != nil { + t.Errorf("fetching %s dwarf details failed: %v", tt.file, err) + } + } + } +} + +func TestOpenFailure(t *testing.T) { + filename := "file.go" // not a PE file + _, err := Open(filename) // don't crash + if err == nil { + t.Errorf("open %s: succeeded unexpectedly", filename) + } +} + +const ( + linkNoCgo = iota + linkCgoDefault + linkCgoInternal + linkCgoExternal +) + +func getImageBase(f *File) uintptr { + switch oh := f.OptionalHeader.(type) { + case *OptionalHeader32: + return uintptr(oh.ImageBase) + case *OptionalHeader64: + return uintptr(oh.ImageBase) + default: + panic("unexpected optionalheader type") + } +} + +func testDWARF(t *testing.T, linktype int) { + if runtime.GOOS != "windows" { + t.Skip("skipping windows only test") + } + testenv.MustHaveGoRun(t) + + tmpdir := t.TempDir() + + src := filepath.Join(tmpdir, "a.go") + file, err := os.Create(src) + if err != nil { + t.Fatal(err) + } + err = template.Must(template.New("main").Parse(testprog)).Execute(file, linktype != linkNoCgo) + if err != nil { + if err := file.Close(); err != nil { + t.Error(err) + } + t.Fatal(err) + } + if err := file.Close(); err != nil { + t.Fatal(err) + } + + exe := filepath.Join(tmpdir, "a.exe") + args := []string{"build", "-o", exe} + switch linktype { + case linkNoCgo: + case linkCgoDefault: + case linkCgoInternal: + args = append(args, "-ldflags", "-linkmode=internal") + case linkCgoExternal: + args = append(args, "-ldflags", "-linkmode=external") + default: + t.Fatalf("invalid linktype parameter of %v", linktype) + } + args = append(args, src) + out, err := exec.Command(testenv.GoToolPath(t), args...).CombinedOutput() + if err != nil { + t.Fatalf("building test executable for linktype %d failed: %s %s", linktype, err, out) + } + out, err = exec.Command(exe).CombinedOutput() + if err != nil { + t.Fatalf("running test executable failed: %s %s", err, out) + } + t.Logf("Testprog output:\n%s", string(out)) + + matches := regexp.MustCompile("offset=(.*)\n").FindStringSubmatch(string(out)) + if len(matches) < 2 { + t.Fatalf("unexpected program output: %s", out) + } + wantoffset, err := strconv.ParseUint(matches[1], 0, 64) + if err != nil { + t.Fatalf("unexpected main offset %q: %s", matches[1], err) + } + + f, err := Open(exe) + if err != nil { + t.Fatal(err) + } + defer f.Close() + + imageBase := getImageBase(f) + + var foundDebugGDBScriptsSection bool + for _, sect := range f.Sections { + if sect.Name == ".debug_gdb_scripts" { + foundDebugGDBScriptsSection = true + } + } + if !foundDebugGDBScriptsSection { + t.Error(".debug_gdb_scripts section is not found") + } + + d, err := f.DWARF() + if err != nil { + t.Fatal(err) + } + + // look for main.main + r := d.Reader() + for { + e, err := r.Next() + if err != nil { + t.Fatal("r.Next:", err) + } + if e == nil { + break + } + if e.Tag == dwarf.TagSubprogram { + name, ok := e.Val(dwarf.AttrName).(string) + if ok && name == "main.main" { + t.Logf("Found main.main") + addr, ok := e.Val(dwarf.AttrLowpc).(uint64) + if !ok { + t.Fatal("Failed to get AttrLowpc") + } + offset := uintptr(addr) - imageBase + if offset != uintptr(wantoffset) { + t.Fatalf("Runtime offset (0x%x) did "+ + "not match dwarf offset "+ + "(0x%x)", wantoffset, offset) + } + return + } + } + } + t.Fatal("main.main not found") +} + +func TestBSSHasZeros(t *testing.T) { + testenv.MustHaveExec(t) + + if runtime.GOOS != "windows" { + t.Skip("skipping windows only test") + } + gccpath, err := exec.LookPath("gcc") + if err != nil { + t.Skip("skipping test: gcc is missing") + } + + tmpdir := t.TempDir() + + srcpath := filepath.Join(tmpdir, "a.c") + src := ` +#include <stdio.h> + +int zero = 0; + +int +main(void) +{ + printf("%d\n", zero); + return 0; +} +` + err = os.WriteFile(srcpath, []byte(src), 0644) + if err != nil { + t.Fatal(err) + } + + objpath := filepath.Join(tmpdir, "a.obj") + cmd := exec.Command(gccpath, "-c", srcpath, "-o", objpath) + out, err := cmd.CombinedOutput() + if err != nil { + t.Fatalf("failed to build object file: %v - %v", err, string(out)) + } + + f, err := Open(objpath) + if err != nil { + t.Fatal(err) + } + defer f.Close() + + var bss *Section + for _, sect := range f.Sections { + if sect.Name == ".bss" { + bss = sect + break + } + } + if bss == nil { + t.Fatal("could not find .bss section") + } + data, err := bss.Data() + if err != nil { + t.Fatal(err) + } + if len(data) == 0 { + t.Fatalf("%s file .bss section cannot be empty", objpath) + } + for _, b := range data { + if b != 0 { + t.Fatalf(".bss section has non zero bytes: %v", data) + } + } +} + +func TestDWARF(t *testing.T) { + testDWARF(t, linkNoCgo) +} + +const testprog = ` +package main + +import "fmt" +import "syscall" +import "unsafe" +{{if .}}import "C" +{{end}} + +// struct MODULEINFO from the Windows SDK +type moduleinfo struct { + BaseOfDll uintptr + SizeOfImage uint32 + EntryPoint uintptr +} + +func add(p unsafe.Pointer, x uintptr) unsafe.Pointer { + return unsafe.Pointer(uintptr(p) + x) +} + +func funcPC(f interface{}) uintptr { + var a uintptr + return **(**uintptr)(add(unsafe.Pointer(&f), unsafe.Sizeof(a))) +} + +func main() { + kernel32 := syscall.MustLoadDLL("kernel32.dll") + psapi := syscall.MustLoadDLL("psapi.dll") + getModuleHandle := kernel32.MustFindProc("GetModuleHandleW") + getCurrentProcess := kernel32.MustFindProc("GetCurrentProcess") + getModuleInformation := psapi.MustFindProc("GetModuleInformation") + + procHandle, _, _ := getCurrentProcess.Call() + moduleHandle, _, err := getModuleHandle.Call(0) + if moduleHandle == 0 { + panic(fmt.Sprintf("GetModuleHandle() failed: %d", err)) + } + + var info moduleinfo + ret, _, err := getModuleInformation.Call(procHandle, moduleHandle, + uintptr(unsafe.Pointer(&info)), unsafe.Sizeof(info)) + + if ret == 0 { + panic(fmt.Sprintf("GetModuleInformation() failed: %d", err)) + } + + offset := funcPC(main) - info.BaseOfDll + fmt.Printf("base=0x%x\n", info.BaseOfDll) + fmt.Printf("main=%p\n", main) + fmt.Printf("offset=0x%x\n", offset) +} +` + +func TestBuildingWindowsGUI(t *testing.T) { + testenv.MustHaveGoBuild(t) + + if runtime.GOOS != "windows" { + t.Skip("skipping windows only test") + } + tmpdir := t.TempDir() + + src := filepath.Join(tmpdir, "a.go") + if err := os.WriteFile(src, []byte(`package main; func main() {}`), 0644); err != nil { + t.Fatal(err) + } + exe := filepath.Join(tmpdir, "a.exe") + cmd := exec.Command(testenv.GoToolPath(t), "build", "-ldflags", "-H=windowsgui", "-o", exe, src) + out, err := cmd.CombinedOutput() + if err != nil { + t.Fatalf("building test executable failed: %s %s", err, out) + } + + f, err := Open(exe) + if err != nil { + t.Fatal(err) + } + defer f.Close() + + switch oh := f.OptionalHeader.(type) { + case *OptionalHeader32: + if oh.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_GUI { + t.Errorf("unexpected Subsystem value: have %d, but want %d", oh.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI) + } + case *OptionalHeader64: + if oh.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_GUI { + t.Errorf("unexpected Subsystem value: have %d, but want %d", oh.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI) + } + default: + t.Fatalf("unexpected OptionalHeader type: have %T, but want *pe.OptionalHeader32 or *pe.OptionalHeader64", oh) + } +} + +func TestImportTableInUnknownSection(t *testing.T) { + if runtime.GOOS != "windows" { + t.Skip("skipping Windows-only test") + } + + // ws2_32.dll import table is located in ".rdata" section, + // so it is good enough to test issue #16103. + const filename = "ws2_32.dll" + path, err := exec.LookPath(filename) + if err != nil { + t.Fatalf("unable to locate required file %q in search path: %s", filename, err) + } + + f, err := Open(path) + if err != nil { + t.Error(err) + } + defer f.Close() + + // now we can extract its imports + symbols, err := f.ImportedSymbols() + if err != nil { + t.Error(err) + } + + if len(symbols) == 0 { + t.Fatalf("unable to locate any imported symbols within file %q.", path) + } +} + +func TestInvalidOptionalHeaderMagic(t *testing.T) { + // Files with invalid optional header magic should return error from NewFile() + // (see https://golang.org/issue/30250 and https://golang.org/issue/32126 for details). + // Input generated by gofuzz + data := []byte("\x00\x00\x00\x0000000\x00\x00\x00\x00\x00\x00\x000000" + + "00000000000000000000" + + "000000000\x00\x00\x0000000000" + + "00000000000000000000" + + "0000000000000000") + + _, err := NewFile(bytes.NewReader(data)) + if err == nil { + t.Fatal("NewFile succeeded unexpectedly") + } +} + +func TestImportedSymbolsNoPanicMissingOptionalHeader(t *testing.T) { + // https://golang.org/issue/30250 + // ImportedSymbols shouldn't panic if optional headers is missing + data, err := os.ReadFile("testdata/gcc-amd64-mingw-obj") + if err != nil { + t.Fatal(err) + } + + f, err := NewFile(bytes.NewReader(data)) + if err != nil { + t.Fatal(err) + } + + if f.OptionalHeader != nil { + t.Fatal("expected f.OptionalHeader to be nil, received non-nil optional header") + } + + syms, err := f.ImportedSymbols() + if err != nil { + t.Fatal(err) + } + + if len(syms) != 0 { + t.Fatalf("expected len(syms) == 0, received len(syms) = %d", len(syms)) + } + +} + +func TestImportedSymbolsNoPanicWithSliceOutOfBound(t *testing.T) { + // https://golang.org/issue/30253 + // ImportedSymbols shouldn't panic with slice out of bounds + // Input generated by gofuzz + data := []byte("L\x01\b\x00regi\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00\x0f\x03" + + "\v\x01\x02\x18\x00\x0e\x00\x00\x00\x1e\x00\x00\x00\x02\x00\x00\x80\x12\x00\x00" + + "\x00\x10\x00\x00\x00 \x00\x00\x00\x00@\x00\x00\x10\x00\x00\x00\x02\x00\x00" + + "\x04\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x90\x00\x00" + + "\x00\x04\x00\x00\x06S\x00\x00\x03\x00\x00\x00\x00\x00 \x00\x00\x10\x00\x00" + + "\x00\x00\x10\x00\x00\x10\x00\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00" + + "\x00\x00\x00\x00\x00`\x00\x00x\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "\x00\x00\x00\x00\x00\x00\x00\x00\x04\x80\x00\x00\x18\x00\x00\x00\x00\x00\x00\x00" + + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb8`\x00\x00|\x00\x00\x00" + + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "\x00\x00\x00\x00.text\x00\x00\x00d\f\x00\x00\x00\x10\x00\x00" + + "\x00\x0e\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "`\x00P`.data\x00\x00\x00\x10\x00\x00\x00\x00 \x00\x00" + + "\x00\x02\x00\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "@\x000\xc0.rdata\x00\x004\x01\x00\x00\x000\x00\x00" + + "\x00\x02\x00\x00\x00\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "@\x000@.eh_fram\xa0\x03\x00\x00\x00@\x00\x00" + + "\x00\x04\x00\x00\x00\x16\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "@\x000@.bss\x00\x00\x00\x00`\x00\x00\x00\x00P\x00\x00" + + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + + "\x80\x000\xc0.idata\x00\x00x\x03\x00\x00\x00`\x00\x00" + + "\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00@\x00" + + "0\xc0.CRT\x00\x00\x00\x00\x18\x00\x00\x00\x00p\x00\x00\x00\x02" + + "\x00\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00@\x00" + + "0\xc0.tls\x00\x00\x00\x00 \x00\x00\x00\x00\x80\x00\x00\x00\x02" + + "\x00\x00\x00 \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x001\xc9" + + "H\x895\x1d") + + f, err := NewFile(bytes.NewReader(data)) + if err != nil { + t.Fatal(err) + } + + syms, err := f.ImportedSymbols() + if err != nil { + t.Fatal(err) + } + + if len(syms) != 0 { + t.Fatalf("expected len(syms) == 0, received len(syms) = %d", len(syms)) + } +} diff --git a/src/debug/pe/pe.go b/src/debug/pe/pe.go new file mode 100644 index 0000000..51001bd --- /dev/null +++ b/src/debug/pe/pe.go @@ -0,0 +1,189 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package pe + +type FileHeader struct { + Machine uint16 + NumberOfSections uint16 + TimeDateStamp uint32 + PointerToSymbolTable uint32 + NumberOfSymbols uint32 + SizeOfOptionalHeader uint16 + Characteristics uint16 +} + +type DataDirectory struct { + VirtualAddress uint32 + Size uint32 +} + +type OptionalHeader32 struct { + Magic uint16 + MajorLinkerVersion uint8 + MinorLinkerVersion uint8 + SizeOfCode uint32 + SizeOfInitializedData uint32 + SizeOfUninitializedData uint32 + AddressOfEntryPoint uint32 + BaseOfCode uint32 + BaseOfData uint32 + ImageBase uint32 + SectionAlignment uint32 + FileAlignment uint32 + MajorOperatingSystemVersion uint16 + MinorOperatingSystemVersion uint16 + MajorImageVersion uint16 + MinorImageVersion uint16 + MajorSubsystemVersion uint16 + MinorSubsystemVersion uint16 + Win32VersionValue uint32 + SizeOfImage uint32 + SizeOfHeaders uint32 + CheckSum uint32 + Subsystem uint16 + DllCharacteristics uint16 + SizeOfStackReserve uint32 + SizeOfStackCommit uint32 + SizeOfHeapReserve uint32 + SizeOfHeapCommit uint32 + LoaderFlags uint32 + NumberOfRvaAndSizes uint32 + DataDirectory [16]DataDirectory +} + +type OptionalHeader64 struct { + Magic uint16 + MajorLinkerVersion uint8 + MinorLinkerVersion uint8 + SizeOfCode uint32 + SizeOfInitializedData uint32 + SizeOfUninitializedData uint32 + AddressOfEntryPoint uint32 + BaseOfCode uint32 + ImageBase uint64 + SectionAlignment uint32 + FileAlignment uint32 + MajorOperatingSystemVersion uint16 + MinorOperatingSystemVersion uint16 + MajorImageVersion uint16 + MinorImageVersion uint16 + MajorSubsystemVersion uint16 + MinorSubsystemVersion uint16 + Win32VersionValue uint32 + SizeOfImage uint32 + SizeOfHeaders uint32 + CheckSum uint32 + Subsystem uint16 + DllCharacteristics uint16 + SizeOfStackReserve uint64 + SizeOfStackCommit uint64 + SizeOfHeapReserve uint64 + SizeOfHeapCommit uint64 + LoaderFlags uint32 + NumberOfRvaAndSizes uint32 + DataDirectory [16]DataDirectory +} + +const ( + IMAGE_FILE_MACHINE_UNKNOWN = 0x0 + IMAGE_FILE_MACHINE_AM33 = 0x1d3 + IMAGE_FILE_MACHINE_AMD64 = 0x8664 + IMAGE_FILE_MACHINE_ARM = 0x1c0 + IMAGE_FILE_MACHINE_ARMNT = 0x1c4 + IMAGE_FILE_MACHINE_ARM64 = 0xaa64 + IMAGE_FILE_MACHINE_EBC = 0xebc + IMAGE_FILE_MACHINE_I386 = 0x14c + IMAGE_FILE_MACHINE_IA64 = 0x200 + IMAGE_FILE_MACHINE_LOONGARCH32 = 0x6232 + IMAGE_FILE_MACHINE_LOONGARCH64 = 0x6264 + IMAGE_FILE_MACHINE_M32R = 0x9041 + IMAGE_FILE_MACHINE_MIPS16 = 0x266 + IMAGE_FILE_MACHINE_MIPSFPU = 0x366 + IMAGE_FILE_MACHINE_MIPSFPU16 = 0x466 + IMAGE_FILE_MACHINE_POWERPC = 0x1f0 + IMAGE_FILE_MACHINE_POWERPCFP = 0x1f1 + IMAGE_FILE_MACHINE_R4000 = 0x166 + IMAGE_FILE_MACHINE_SH3 = 0x1a2 + IMAGE_FILE_MACHINE_SH3DSP = 0x1a3 + IMAGE_FILE_MACHINE_SH4 = 0x1a6 + IMAGE_FILE_MACHINE_SH5 = 0x1a8 + IMAGE_FILE_MACHINE_THUMB = 0x1c2 + IMAGE_FILE_MACHINE_WCEMIPSV2 = 0x169 + IMAGE_FILE_MACHINE_RISCV32 = 0x5032 + IMAGE_FILE_MACHINE_RISCV64 = 0x5064 + IMAGE_FILE_MACHINE_RISCV128 = 0x5128 +) + +// IMAGE_DIRECTORY_ENTRY constants +const ( + IMAGE_DIRECTORY_ENTRY_EXPORT = 0 + IMAGE_DIRECTORY_ENTRY_IMPORT = 1 + IMAGE_DIRECTORY_ENTRY_RESOURCE = 2 + IMAGE_DIRECTORY_ENTRY_EXCEPTION = 3 + IMAGE_DIRECTORY_ENTRY_SECURITY = 4 + IMAGE_DIRECTORY_ENTRY_BASERELOC = 5 + IMAGE_DIRECTORY_ENTRY_DEBUG = 6 + IMAGE_DIRECTORY_ENTRY_ARCHITECTURE = 7 + IMAGE_DIRECTORY_ENTRY_GLOBALPTR = 8 + IMAGE_DIRECTORY_ENTRY_TLS = 9 + IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG = 10 + IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT = 11 + IMAGE_DIRECTORY_ENTRY_IAT = 12 + IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT = 13 + IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR = 14 +) + +// Values of IMAGE_FILE_HEADER.Characteristics. These can be combined together. +const ( + IMAGE_FILE_RELOCS_STRIPPED = 0x0001 + IMAGE_FILE_EXECUTABLE_IMAGE = 0x0002 + IMAGE_FILE_LINE_NUMS_STRIPPED = 0x0004 + IMAGE_FILE_LOCAL_SYMS_STRIPPED = 0x0008 + IMAGE_FILE_AGGRESIVE_WS_TRIM = 0x0010 + IMAGE_FILE_LARGE_ADDRESS_AWARE = 0x0020 + IMAGE_FILE_BYTES_REVERSED_LO = 0x0080 + IMAGE_FILE_32BIT_MACHINE = 0x0100 + IMAGE_FILE_DEBUG_STRIPPED = 0x0200 + IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP = 0x0400 + IMAGE_FILE_NET_RUN_FROM_SWAP = 0x0800 + IMAGE_FILE_SYSTEM = 0x1000 + IMAGE_FILE_DLL = 0x2000 + IMAGE_FILE_UP_SYSTEM_ONLY = 0x4000 + IMAGE_FILE_BYTES_REVERSED_HI = 0x8000 +) + +// OptionalHeader64.Subsystem and OptionalHeader32.Subsystem values. +const ( + IMAGE_SUBSYSTEM_UNKNOWN = 0 + IMAGE_SUBSYSTEM_NATIVE = 1 + IMAGE_SUBSYSTEM_WINDOWS_GUI = 2 + IMAGE_SUBSYSTEM_WINDOWS_CUI = 3 + IMAGE_SUBSYSTEM_OS2_CUI = 5 + IMAGE_SUBSYSTEM_POSIX_CUI = 7 + IMAGE_SUBSYSTEM_NATIVE_WINDOWS = 8 + IMAGE_SUBSYSTEM_WINDOWS_CE_GUI = 9 + IMAGE_SUBSYSTEM_EFI_APPLICATION = 10 + IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER = 11 + IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER = 12 + IMAGE_SUBSYSTEM_EFI_ROM = 13 + IMAGE_SUBSYSTEM_XBOX = 14 + IMAGE_SUBSYSTEM_WINDOWS_BOOT_APPLICATION = 16 +) + +// OptionalHeader64.DllCharacteristics and OptionalHeader32.DllCharacteristics +// values. These can be combined together. +const ( + IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA = 0x0020 + IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE = 0x0040 + IMAGE_DLLCHARACTERISTICS_FORCE_INTEGRITY = 0x0080 + IMAGE_DLLCHARACTERISTICS_NX_COMPAT = 0x0100 + IMAGE_DLLCHARACTERISTICS_NO_ISOLATION = 0x0200 + IMAGE_DLLCHARACTERISTICS_NO_SEH = 0x0400 + IMAGE_DLLCHARACTERISTICS_NO_BIND = 0x0800 + IMAGE_DLLCHARACTERISTICS_APPCONTAINER = 0x1000 + IMAGE_DLLCHARACTERISTICS_WDM_DRIVER = 0x2000 + IMAGE_DLLCHARACTERISTICS_GUARD_CF = 0x4000 + IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE = 0x8000 +) diff --git a/src/debug/pe/section.go b/src/debug/pe/section.go new file mode 100644 index 0000000..fabb47a --- /dev/null +++ b/src/debug/pe/section.go @@ -0,0 +1,119 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package pe + +import ( + "encoding/binary" + "fmt" + "internal/saferio" + "io" + "strconv" +) + +// SectionHeader32 represents real PE COFF section header. +type SectionHeader32 struct { + Name [8]uint8 + VirtualSize uint32 + VirtualAddress uint32 + SizeOfRawData uint32 + PointerToRawData uint32 + PointerToRelocations uint32 + PointerToLineNumbers uint32 + NumberOfRelocations uint16 + NumberOfLineNumbers uint16 + Characteristics uint32 +} + +// fullName finds real name of section sh. Normally name is stored +// in sh.Name, but if it is longer then 8 characters, it is stored +// in COFF string table st instead. +func (sh *SectionHeader32) fullName(st StringTable) (string, error) { + if sh.Name[0] != '/' { + return cstring(sh.Name[:]), nil + } + i, err := strconv.Atoi(cstring(sh.Name[1:])) + if err != nil { + return "", err + } + return st.String(uint32(i)) +} + +// TODO(brainman): copy all IMAGE_REL_* consts from ldpe.go here + +// Reloc represents a PE COFF relocation. +// Each section contains its own relocation list. +type Reloc struct { + VirtualAddress uint32 + SymbolTableIndex uint32 + Type uint16 +} + +func readRelocs(sh *SectionHeader, r io.ReadSeeker) ([]Reloc, error) { + if sh.NumberOfRelocations <= 0 { + return nil, nil + } + _, err := r.Seek(int64(sh.PointerToRelocations), seekStart) + if err != nil { + return nil, fmt.Errorf("fail to seek to %q section relocations: %v", sh.Name, err) + } + relocs := make([]Reloc, sh.NumberOfRelocations) + err = binary.Read(r, binary.LittleEndian, relocs) + if err != nil { + return nil, fmt.Errorf("fail to read section relocations: %v", err) + } + return relocs, nil +} + +// SectionHeader is similar to SectionHeader32 with Name +// field replaced by Go string. +type SectionHeader struct { + Name string + VirtualSize uint32 + VirtualAddress uint32 + Size uint32 + Offset uint32 + PointerToRelocations uint32 + PointerToLineNumbers uint32 + NumberOfRelocations uint16 + NumberOfLineNumbers uint16 + Characteristics uint32 +} + +// Section provides access to PE COFF section. +type Section struct { + SectionHeader + Relocs []Reloc + + // Embed ReaderAt for ReadAt method. + // Do not embed SectionReader directly + // to avoid having Read and Seek. + // If a client wants Read and Seek it must use + // Open() to avoid fighting over the seek offset + // with other clients. + io.ReaderAt + sr *io.SectionReader +} + +// Data reads and returns the contents of the PE section s. +func (s *Section) Data() ([]byte, error) { + return saferio.ReadDataAt(s.sr, uint64(s.Size), 0) +} + +// Open returns a new ReadSeeker reading the PE section s. +func (s *Section) Open() io.ReadSeeker { + return io.NewSectionReader(s.sr, 0, 1<<63-1) +} + +// Section characteristics flags. +const ( + IMAGE_SCN_CNT_CODE = 0x00000020 + IMAGE_SCN_CNT_INITIALIZED_DATA = 0x00000040 + IMAGE_SCN_CNT_UNINITIALIZED_DATA = 0x00000080 + IMAGE_SCN_LNK_COMDAT = 0x00001000 + IMAGE_SCN_MEM_DISCARDABLE = 0x02000000 + IMAGE_SCN_MEM_EXECUTE = 0x20000000 + IMAGE_SCN_MEM_READ = 0x40000000 + IMAGE_SCN_MEM_WRITE = 0x80000000 +) diff --git a/src/debug/pe/string.go b/src/debug/pe/string.go new file mode 100644 index 0000000..a156bbe --- /dev/null +++ b/src/debug/pe/string.go @@ -0,0 +1,69 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package pe + +import ( + "bytes" + "encoding/binary" + "fmt" + "internal/saferio" + "io" +) + +// cstring converts ASCII byte sequence b to string. +// It stops once it finds 0 or reaches end of b. +func cstring(b []byte) string { + i := bytes.IndexByte(b, 0) + if i == -1 { + i = len(b) + } + return string(b[:i]) +} + +// StringTable is a COFF string table. +type StringTable []byte + +func readStringTable(fh *FileHeader, r io.ReadSeeker) (StringTable, error) { + // COFF string table is located right after COFF symbol table. + if fh.PointerToSymbolTable <= 0 { + return nil, nil + } + offset := fh.PointerToSymbolTable + COFFSymbolSize*fh.NumberOfSymbols + _, err := r.Seek(int64(offset), seekStart) + if err != nil { + return nil, fmt.Errorf("fail to seek to string table: %v", err) + } + var l uint32 + err = binary.Read(r, binary.LittleEndian, &l) + if err != nil { + return nil, fmt.Errorf("fail to read string table length: %v", err) + } + // string table length includes itself + if l <= 4 { + return nil, nil + } + l -= 4 + + buf, err := saferio.ReadData(r, uint64(l)) + if err != nil { + return nil, fmt.Errorf("fail to read string table: %v", err) + } + return StringTable(buf), nil +} + +// TODO(brainman): decide if start parameter should be int instead of uint32 + +// String extracts string from COFF string table st at offset start. +func (st StringTable) String(start uint32) (string, error) { + // start includes 4 bytes of string table length + if start < 4 { + return "", fmt.Errorf("offset %d is before the start of string table", start) + } + start -= 4 + if int(start) > len(st) { + return "", fmt.Errorf("offset %d is beyond the end of string table", start) + } + return cstring(st[start:]), nil +} diff --git a/src/debug/pe/symbol.go b/src/debug/pe/symbol.go new file mode 100644 index 0000000..b1654f8 --- /dev/null +++ b/src/debug/pe/symbol.go @@ -0,0 +1,209 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package pe + +import ( + "encoding/binary" + "errors" + "fmt" + "internal/saferio" + "io" + "unsafe" +) + +const COFFSymbolSize = 18 + +// COFFSymbol represents single COFF symbol table record. +type COFFSymbol struct { + Name [8]uint8 + Value uint32 + SectionNumber int16 + Type uint16 + StorageClass uint8 + NumberOfAuxSymbols uint8 +} + +// readCOFFSymbols reads in the symbol table for a PE file, returning +// a slice of COFFSymbol objects. The PE format includes both primary +// symbols (whose fields are described by COFFSymbol above) and +// auxiliary symbols; all symbols are 18 bytes in size. The auxiliary +// symbols for a given primary symbol are placed following it in the +// array, e.g. +// +// ... +// k+0: regular sym k +// k+1: 1st aux symbol for k +// k+2: 2nd aux symbol for k +// k+3: regular sym k+3 +// k+4: 1st aux symbol for k+3 +// k+5: regular sym k+5 +// k+6: regular sym k+6 +// +// The PE format allows for several possible aux symbol formats. For +// more info see: +// +// https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#auxiliary-symbol-records +// +// At the moment this package only provides APIs for looking at +// aux symbols of format 5 (associated with section definition symbols). +func readCOFFSymbols(fh *FileHeader, r io.ReadSeeker) ([]COFFSymbol, error) { + if fh.PointerToSymbolTable == 0 { + return nil, nil + } + if fh.NumberOfSymbols <= 0 { + return nil, nil + } + _, err := r.Seek(int64(fh.PointerToSymbolTable), seekStart) + if err != nil { + return nil, fmt.Errorf("fail to seek to symbol table: %v", err) + } + c := saferio.SliceCap((*COFFSymbol)(nil), uint64(fh.NumberOfSymbols)) + if c < 0 { + return nil, errors.New("too many symbols; file may be corrupt") + } + syms := make([]COFFSymbol, 0, c) + naux := 0 + for k := uint32(0); k < fh.NumberOfSymbols; k++ { + var sym COFFSymbol + if naux == 0 { + // Read a primary symbol. + err = binary.Read(r, binary.LittleEndian, &sym) + if err != nil { + return nil, fmt.Errorf("fail to read symbol table: %v", err) + } + // Record how many auxiliary symbols it has. + naux = int(sym.NumberOfAuxSymbols) + } else { + // Read an aux symbol. At the moment we assume all + // aux symbols are format 5 (obviously this doesn't always + // hold; more cases will be needed below if more aux formats + // are supported in the future). + naux-- + aux := (*COFFSymbolAuxFormat5)(unsafe.Pointer(&sym)) + err = binary.Read(r, binary.LittleEndian, aux) + if err != nil { + return nil, fmt.Errorf("fail to read symbol table: %v", err) + } + } + syms = append(syms, sym) + } + if naux != 0 { + return nil, fmt.Errorf("fail to read symbol table: %d aux symbols unread", naux) + } + return syms, nil +} + +// isSymNameOffset checks symbol name if it is encoded as offset into string table. +func isSymNameOffset(name [8]byte) (bool, uint32) { + if name[0] == 0 && name[1] == 0 && name[2] == 0 && name[3] == 0 { + return true, binary.LittleEndian.Uint32(name[4:]) + } + return false, 0 +} + +// FullName finds real name of symbol sym. Normally name is stored +// in sym.Name, but if it is longer then 8 characters, it is stored +// in COFF string table st instead. +func (sym *COFFSymbol) FullName(st StringTable) (string, error) { + if ok, offset := isSymNameOffset(sym.Name); ok { + return st.String(offset) + } + return cstring(sym.Name[:]), nil +} + +func removeAuxSymbols(allsyms []COFFSymbol, st StringTable) ([]*Symbol, error) { + if len(allsyms) == 0 { + return nil, nil + } + syms := make([]*Symbol, 0) + aux := uint8(0) + for _, sym := range allsyms { + if aux > 0 { + aux-- + continue + } + name, err := sym.FullName(st) + if err != nil { + return nil, err + } + aux = sym.NumberOfAuxSymbols + s := &Symbol{ + Name: name, + Value: sym.Value, + SectionNumber: sym.SectionNumber, + Type: sym.Type, + StorageClass: sym.StorageClass, + } + syms = append(syms, s) + } + return syms, nil +} + +// Symbol is similar to COFFSymbol with Name field replaced +// by Go string. Symbol also does not have NumberOfAuxSymbols. +type Symbol struct { + Name string + Value uint32 + SectionNumber int16 + Type uint16 + StorageClass uint8 +} + +// COFFSymbolAuxFormat5 describes the expected form of an aux symbol +// attached to a section definition symbol. The PE format defines a +// number of different aux symbol formats: format 1 for function +// definitions, format 2 for .be and .ef symbols, and so on. Format 5 +// holds extra info associated with a section definition, including +// number of relocations + line numbers, as well as COMDAT info. See +// https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#auxiliary-format-5-section-definitions +// for more on what's going on here. +type COFFSymbolAuxFormat5 struct { + Size uint32 + NumRelocs uint16 + NumLineNumbers uint16 + Checksum uint32 + SecNum uint16 + Selection uint8 + _ [3]uint8 // padding +} + +// These constants make up the possible values for the 'Selection' +// field in an AuxFormat5. +const ( + IMAGE_COMDAT_SELECT_NODUPLICATES = 1 + IMAGE_COMDAT_SELECT_ANY = 2 + IMAGE_COMDAT_SELECT_SAME_SIZE = 3 + IMAGE_COMDAT_SELECT_EXACT_MATCH = 4 + IMAGE_COMDAT_SELECT_ASSOCIATIVE = 5 + IMAGE_COMDAT_SELECT_LARGEST = 6 +) + +// COFFSymbolReadSectionDefAux returns a blob of axiliary information +// (including COMDAT info) for a section definition symbol. Here 'idx' +// is the index of a section symbol in the main COFFSymbol array for +// the File. Return value is a pointer to the appropriate aux symbol +// struct. For more info, see: +// +// auxiliary symbols: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#auxiliary-symbol-records +// COMDAT sections: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#comdat-sections-object-only +// auxiliary info for section definitions: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#auxiliary-format-5-section-definitions +func (f *File) COFFSymbolReadSectionDefAux(idx int) (*COFFSymbolAuxFormat5, error) { + var rv *COFFSymbolAuxFormat5 + if idx < 0 || idx >= len(f.COFFSymbols) { + return rv, fmt.Errorf("invalid symbol index") + } + pesym := &f.COFFSymbols[idx] + const IMAGE_SYM_CLASS_STATIC = 3 + if pesym.StorageClass != uint8(IMAGE_SYM_CLASS_STATIC) { + return rv, fmt.Errorf("incorrect symbol storage class") + } + if pesym.NumberOfAuxSymbols == 0 || idx+1 >= len(f.COFFSymbols) { + return rv, fmt.Errorf("aux symbol unavailable") + } + // Locate and return a pointer to the successor aux symbol. + pesymn := &f.COFFSymbols[idx+1] + rv = (*COFFSymbolAuxFormat5)(unsafe.Pointer(pesymn)) + return rv, nil +} diff --git a/src/debug/pe/symbols_test.go b/src/debug/pe/symbols_test.go new file mode 100644 index 0000000..c4dcd95 --- /dev/null +++ b/src/debug/pe/symbols_test.go @@ -0,0 +1,91 @@ +// Copyright 2022 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package pe + +import ( + "fmt" + "testing" +) + +type testpoint struct { + name string + ok bool + err string + auxstr string +} + +func TestReadCOFFSymbolAuxInfo(t *testing.T) { + testpoints := map[int]testpoint{ + 39: testpoint{ + name: ".rdata$.refptr.__native_startup_lock", + ok: true, + auxstr: "{Size:8 NumRelocs:1 NumLineNumbers:0 Checksum:0 SecNum:16 Selection:2 _:[0 0 0]}", + }, + 81: testpoint{ + name: ".debug_line", + ok: true, + auxstr: "{Size:994 NumRelocs:1 NumLineNumbers:0 Checksum:1624223678 SecNum:32 Selection:0 _:[0 0 0]}", + }, + 155: testpoint{ + name: ".file", + ok: false, + err: "incorrect symbol storage class", + }, + } + + // The testdata PE object file below was selected from a release + // build from https://github.com/mstorsjo/llvm-mingw/releases; it + // corresponds to the mingw "crt2.o" object. The object itself was + // built using an x86_64 HOST=linux TARGET=windows clang cross + // compiler based on LLVM 13. More build details can be found at + // https://github.com/mstorsjo/llvm-mingw/releases. + f, err := Open("testdata/llvm-mingw-20211002-msvcrt-x86_64-crt2") + if err != nil { + t.Errorf("open failed with %v", err) + } + defer f.Close() + for k := range f.COFFSymbols { + tp, ok := testpoints[k] + if !ok { + continue + } + sym := &f.COFFSymbols[k] + if sym.NumberOfAuxSymbols == 0 { + t.Errorf("expected aux symbols for sym %d", k) + continue + } + name, nerr := sym.FullName(f.StringTable) + if nerr != nil { + t.Errorf("FullName(%d) failed with %v", k, nerr) + continue + } + if name != tp.name { + t.Errorf("name check for %d, got %s want %s", k, name, tp.name) + continue + } + ap, err := f.COFFSymbolReadSectionDefAux(k) + if tp.ok { + if err != nil { + t.Errorf("unexpected failure on %d, got error %v", k, err) + continue + } + got := fmt.Sprintf("%+v", *ap) + if got != tp.auxstr { + t.Errorf("COFFSymbolReadSectionDefAux on %d bad return, got:\n%s\nwant:\n%s\n", k, got, tp.auxstr) + continue + } + } else { + if err == nil { + t.Errorf("unexpected non-failure on %d", k) + continue + } + got := fmt.Sprintf("%v", err) + if got != tp.err { + t.Errorf("COFFSymbolReadSectionDefAux %d wrong error, got %q want %q", k, got, tp.err) + continue + } + } + } +} diff --git a/src/debug/pe/testdata/gcc-386-mingw-exec b/src/debug/pe/testdata/gcc-386-mingw-exec Binary files differnew file mode 100644 index 0000000..4b808d0 --- /dev/null +++ b/src/debug/pe/testdata/gcc-386-mingw-exec diff --git a/src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec b/src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec Binary files differnew file mode 100644 index 0000000..329dca6 --- /dev/null +++ b/src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec diff --git a/src/debug/pe/testdata/gcc-386-mingw-obj b/src/debug/pe/testdata/gcc-386-mingw-obj Binary files differnew file mode 100644 index 0000000..0c84d89 --- /dev/null +++ b/src/debug/pe/testdata/gcc-386-mingw-obj diff --git a/src/debug/pe/testdata/gcc-amd64-mingw-exec b/src/debug/pe/testdata/gcc-amd64-mingw-exec Binary files differnew file mode 100644 index 0000000..ce6feb6 --- /dev/null +++ b/src/debug/pe/testdata/gcc-amd64-mingw-exec diff --git a/src/debug/pe/testdata/gcc-amd64-mingw-obj b/src/debug/pe/testdata/gcc-amd64-mingw-obj Binary files differnew file mode 100644 index 0000000..48ae792 --- /dev/null +++ b/src/debug/pe/testdata/gcc-amd64-mingw-obj diff --git a/src/debug/pe/testdata/hello.c b/src/debug/pe/testdata/hello.c new file mode 100644 index 0000000..a689d36 --- /dev/null +++ b/src/debug/pe/testdata/hello.c @@ -0,0 +1,8 @@ +#include <stdio.h> + +int +main(void) +{ + printf("hello, world\n"); + return 0; +} diff --git a/src/debug/pe/testdata/llvm-mingw-20211002-msvcrt-x86_64-crt2 b/src/debug/pe/testdata/llvm-mingw-20211002-msvcrt-x86_64-crt2 Binary files differnew file mode 100644 index 0000000..5576c1c --- /dev/null +++ b/src/debug/pe/testdata/llvm-mingw-20211002-msvcrt-x86_64-crt2 diff --git a/src/debug/pe/testdata/vmlinuz-4.15.0-47-generic b/src/debug/pe/testdata/vmlinuz-4.15.0-47-generic Binary files differnew file mode 100644 index 0000000..d01cf61 --- /dev/null +++ b/src/debug/pe/testdata/vmlinuz-4.15.0-47-generic diff --git a/src/debug/plan9obj/file.go b/src/debug/plan9obj/file.go new file mode 100644 index 0000000..ad74c72 --- /dev/null +++ b/src/debug/plan9obj/file.go @@ -0,0 +1,340 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package plan9obj implements access to Plan 9 a.out object files. + +# Security + +This package is not designed to be hardened against adversarial inputs, and is +outside the scope of https://go.dev/security/policy. In particular, only basic +validation is done when parsing object files. As such, care should be taken when +parsing untrusted inputs, as parsing malformed files may consume significant +resources, or cause panics. +*/ +package plan9obj + +import ( + "encoding/binary" + "errors" + "fmt" + "internal/saferio" + "io" + "os" +) + +// A FileHeader represents a Plan 9 a.out file header. +type FileHeader struct { + Magic uint32 + Bss uint32 + Entry uint64 + PtrSize int + LoadAddress uint64 + HdrSize uint64 +} + +// A File represents an open Plan 9 a.out file. +type File struct { + FileHeader + Sections []*Section + closer io.Closer +} + +// A SectionHeader represents a single Plan 9 a.out section header. +// This structure doesn't exist on-disk, but eases navigation +// through the object file. +type SectionHeader struct { + Name string + Size uint32 + Offset uint32 +} + +// A Section represents a single section in a Plan 9 a.out file. +type Section struct { + SectionHeader + + // Embed ReaderAt for ReadAt method. + // Do not embed SectionReader directly + // to avoid having Read and Seek. + // If a client wants Read and Seek it must use + // Open() to avoid fighting over the seek offset + // with other clients. + io.ReaderAt + sr *io.SectionReader +} + +// Data reads and returns the contents of the Plan 9 a.out section. +func (s *Section) Data() ([]byte, error) { + return saferio.ReadDataAt(s.sr, uint64(s.Size), 0) +} + +// Open returns a new ReadSeeker reading the Plan 9 a.out section. +func (s *Section) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) } + +// A Symbol represents an entry in a Plan 9 a.out symbol table section. +type Sym struct { + Value uint64 + Type rune + Name string +} + +/* + * Plan 9 a.out reader + */ + +// formatError is returned by some operations if the data does +// not have the correct format for an object file. +type formatError struct { + off int + msg string + val any +} + +func (e *formatError) Error() string { + msg := e.msg + if e.val != nil { + msg += fmt.Sprintf(" '%v'", e.val) + } + msg += fmt.Sprintf(" in record at byte %#x", e.off) + return msg +} + +// Open opens the named file using os.Open and prepares it for use as a Plan 9 a.out binary. +func Open(name string) (*File, error) { + f, err := os.Open(name) + if err != nil { + return nil, err + } + ff, err := NewFile(f) + if err != nil { + f.Close() + return nil, err + } + ff.closer = f + return ff, nil +} + +// Close closes the File. +// If the File was created using NewFile directly instead of Open, +// Close has no effect. +func (f *File) Close() error { + var err error + if f.closer != nil { + err = f.closer.Close() + f.closer = nil + } + return err +} + +func parseMagic(magic []byte) (uint32, error) { + m := binary.BigEndian.Uint32(magic) + switch m { + case Magic386, MagicAMD64, MagicARM: + return m, nil + } + return 0, &formatError{0, "bad magic number", magic} +} + +// NewFile creates a new File for accessing a Plan 9 binary in an underlying reader. +// The Plan 9 binary is expected to start at position 0 in the ReaderAt. +func NewFile(r io.ReaderAt) (*File, error) { + sr := io.NewSectionReader(r, 0, 1<<63-1) + // Read and decode Plan 9 magic + var magic [4]byte + if _, err := r.ReadAt(magic[:], 0); err != nil { + return nil, err + } + _, err := parseMagic(magic[:]) + if err != nil { + return nil, err + } + + ph := new(prog) + if err := binary.Read(sr, binary.BigEndian, ph); err != nil { + return nil, err + } + + f := &File{FileHeader: FileHeader{ + Magic: ph.Magic, + Bss: ph.Bss, + Entry: uint64(ph.Entry), + PtrSize: 4, + LoadAddress: 0x1000, + HdrSize: 4 * 8, + }} + + if ph.Magic&Magic64 != 0 { + if err := binary.Read(sr, binary.BigEndian, &f.Entry); err != nil { + return nil, err + } + f.PtrSize = 8 + f.LoadAddress = 0x200000 + f.HdrSize += 8 + } + + var sects = []struct { + name string + size uint32 + }{ + {"text", ph.Text}, + {"data", ph.Data}, + {"syms", ph.Syms}, + {"spsz", ph.Spsz}, + {"pcsz", ph.Pcsz}, + } + + f.Sections = make([]*Section, 5) + + off := uint32(f.HdrSize) + + for i, sect := range sects { + s := new(Section) + s.SectionHeader = SectionHeader{ + Name: sect.name, + Size: sect.size, + Offset: off, + } + off += sect.size + s.sr = io.NewSectionReader(r, int64(s.Offset), int64(s.Size)) + s.ReaderAt = s.sr + f.Sections[i] = s + } + + return f, nil +} + +func walksymtab(data []byte, ptrsz int, fn func(sym) error) error { + var order binary.ByteOrder = binary.BigEndian + var s sym + p := data + for len(p) >= 4 { + // Symbol type, value. + if len(p) < ptrsz { + return &formatError{len(data), "unexpected EOF", nil} + } + // fixed-width value + if ptrsz == 8 { + s.value = order.Uint64(p[0:8]) + p = p[8:] + } else { + s.value = uint64(order.Uint32(p[0:4])) + p = p[4:] + } + + if len(p) < 1 { + return &formatError{len(data), "unexpected EOF", nil} + } + typ := p[0] & 0x7F + s.typ = typ + p = p[1:] + + // Name. + var i int + var nnul int + for i = 0; i < len(p); i++ { + if p[i] == 0 { + nnul = 1 + break + } + } + switch typ { + case 'z', 'Z': + p = p[i+nnul:] + for i = 0; i+2 <= len(p); i += 2 { + if p[i] == 0 && p[i+1] == 0 { + nnul = 2 + break + } + } + } + if len(p) < i+nnul { + return &formatError{len(data), "unexpected EOF", nil} + } + s.name = p[0:i] + i += nnul + p = p[i:] + + fn(s) + } + return nil +} + +// newTable decodes the Go symbol table in data, +// returning an in-memory representation. +func newTable(symtab []byte, ptrsz int) ([]Sym, error) { + var n int + err := walksymtab(symtab, ptrsz, func(s sym) error { + n++ + return nil + }) + if err != nil { + return nil, err + } + + fname := make(map[uint16]string) + syms := make([]Sym, 0, n) + err = walksymtab(symtab, ptrsz, func(s sym) error { + n := len(syms) + syms = syms[0 : n+1] + ts := &syms[n] + ts.Type = rune(s.typ) + ts.Value = s.value + switch s.typ { + default: + ts.Name = string(s.name) + case 'z', 'Z': + for i := 0; i < len(s.name); i += 2 { + eltIdx := binary.BigEndian.Uint16(s.name[i : i+2]) + elt, ok := fname[eltIdx] + if !ok { + return &formatError{-1, "bad filename code", eltIdx} + } + if n := len(ts.Name); n > 0 && ts.Name[n-1] != '/' { + ts.Name += "/" + } + ts.Name += elt + } + } + switch s.typ { + case 'f': + fname[uint16(s.value)] = ts.Name + } + return nil + }) + if err != nil { + return nil, err + } + + return syms, nil +} + +// ErrNoSymbols is returned by File.Symbols if there is no such section +// in the File. +var ErrNoSymbols = errors.New("no symbol section") + +// Symbols returns the symbol table for f. +func (f *File) Symbols() ([]Sym, error) { + symtabSection := f.Section("syms") + if symtabSection == nil { + return nil, ErrNoSymbols + } + + symtab, err := symtabSection.Data() + if err != nil { + return nil, errors.New("cannot load symbol section") + } + + return newTable(symtab, f.PtrSize) +} + +// Section returns a section with the given name, or nil if no such +// section exists. +func (f *File) Section(name string) *Section { + for _, s := range f.Sections { + if s.Name == name { + return s + } + } + return nil +} diff --git a/src/debug/plan9obj/file_test.go b/src/debug/plan9obj/file_test.go new file mode 100644 index 0000000..7e107bc --- /dev/null +++ b/src/debug/plan9obj/file_test.go @@ -0,0 +1,81 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package plan9obj + +import ( + "reflect" + "testing" +) + +type fileTest struct { + file string + hdr FileHeader + sections []*SectionHeader +} + +var fileTests = []fileTest{ + { + "testdata/386-plan9-exec", + FileHeader{Magic386, 0x324, 0x14, 4, 0x1000, 32}, + []*SectionHeader{ + {"text", 0x4c5f, 0x20}, + {"data", 0x94c, 0x4c7f}, + {"syms", 0x2c2b, 0x55cb}, + {"spsz", 0x0, 0x81f6}, + {"pcsz", 0xf7a, 0x81f6}, + }, + }, + { + "testdata/amd64-plan9-exec", + FileHeader{MagicAMD64, 0x618, 0x13, 8, 0x200000, 40}, + []*SectionHeader{ + {"text", 0x4213, 0x28}, + {"data", 0xa80, 0x423b}, + {"syms", 0x2c8c, 0x4cbb}, + {"spsz", 0x0, 0x7947}, + {"pcsz", 0xca0, 0x7947}, + }, + }, +} + +func TestOpen(t *testing.T) { + for i := range fileTests { + tt := &fileTests[i] + + f, err := Open(tt.file) + if err != nil { + t.Error(err) + continue + } + if !reflect.DeepEqual(f.FileHeader, tt.hdr) { + t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr) + continue + } + + for i, sh := range f.Sections { + if i >= len(tt.sections) { + break + } + have := &sh.SectionHeader + want := tt.sections[i] + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + } + tn := len(tt.sections) + fn := len(f.Sections) + if tn != fn { + t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn) + } + } +} + +func TestOpenFailure(t *testing.T) { + filename := "file.go" // not a Plan 9 a.out file + _, err := Open(filename) // don't crash + if err == nil { + t.Errorf("open %s: succeeded unexpectedly", filename) + } +} diff --git a/src/debug/plan9obj/plan9obj.go b/src/debug/plan9obj/plan9obj.go new file mode 100644 index 0000000..7a19451 --- /dev/null +++ b/src/debug/plan9obj/plan9obj.go @@ -0,0 +1,36 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* + * Plan 9 a.out constants and data structures + */ + +package plan9obj + +// Plan 9 Program header. +type prog struct { + Magic uint32 /* magic number */ + Text uint32 /* size of text segment */ + Data uint32 /* size of initialized data */ + Bss uint32 /* size of uninitialized data */ + Syms uint32 /* size of symbol table */ + Entry uint32 /* entry point */ + Spsz uint32 /* size of pc/sp offset table */ + Pcsz uint32 /* size of pc/line number table */ +} + +// Plan 9 symbol table entries. +type sym struct { + value uint64 + typ byte + name []byte +} + +const ( + Magic64 = 0x8000 // 64-bit expanded header + + Magic386 = (4*11+0)*11 + 7 + MagicAMD64 = (4*26+0)*26 + 7 + Magic64 + MagicARM = (4*20+0)*20 + 7 +) diff --git a/src/debug/plan9obj/testdata/386-plan9-exec b/src/debug/plan9obj/testdata/386-plan9-exec Binary files differnew file mode 100644 index 0000000..748e83f --- /dev/null +++ b/src/debug/plan9obj/testdata/386-plan9-exec diff --git a/src/debug/plan9obj/testdata/amd64-plan9-exec b/src/debug/plan9obj/testdata/amd64-plan9-exec Binary files differnew file mode 100644 index 0000000..3e257dd --- /dev/null +++ b/src/debug/plan9obj/testdata/amd64-plan9-exec diff --git a/src/debug/plan9obj/testdata/hello.c b/src/debug/plan9obj/testdata/hello.c new file mode 100644 index 0000000..c0d633e --- /dev/null +++ b/src/debug/plan9obj/testdata/hello.c @@ -0,0 +1,8 @@ +#include <u.h> +#include <libc.h> + +void +main(void) +{ + print("hello, world\n"); +} |