diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:14:23 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:14:23 +0000 |
commit | 73df946d56c74384511a194dd01dbe099584fd1a (patch) | |
tree | fd0bcea490dd81327ddfbb31e215439672c9a068 /src/internal/xcoff | |
parent | Initial commit. (diff) | |
download | golang-1.16-upstream.tar.xz golang-1.16-upstream.zip |
Adding upstream version 1.16.10.upstream/1.16.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/internal/xcoff')
-rw-r--r-- | src/internal/xcoff/ar.go | 228 | ||||
-rw-r--r-- | src/internal/xcoff/ar_test.go | 79 | ||||
-rw-r--r-- | src/internal/xcoff/file.go | 687 | ||||
-rw-r--r-- | src/internal/xcoff/file_test.go | 102 | ||||
-rw-r--r-- | src/internal/xcoff/testdata/bigar-empty | 2 | ||||
-rw-r--r-- | src/internal/xcoff/testdata/bigar-ppc64 | bin | 0 -> 2468 bytes | |||
-rw-r--r-- | src/internal/xcoff/testdata/gcc-ppc32-aix-dwarf2-exec | bin | 0 -> 54694 bytes | |||
-rw-r--r-- | src/internal/xcoff/testdata/gcc-ppc64-aix-dwarf2-exec | bin | 0 -> 57152 bytes | |||
-rw-r--r-- | src/internal/xcoff/testdata/hello.c | 7 | ||||
-rw-r--r-- | src/internal/xcoff/testdata/printbye.c | 5 | ||||
-rw-r--r-- | src/internal/xcoff/testdata/printhello.c | 5 | ||||
-rw-r--r-- | src/internal/xcoff/xcoff.go | 367 |
12 files changed, 1482 insertions, 0 deletions
diff --git a/src/internal/xcoff/ar.go b/src/internal/xcoff/ar.go new file mode 100644 index 0000000..0fb410f --- /dev/null +++ b/src/internal/xcoff/ar.go @@ -0,0 +1,228 @@ +// Copyright 2018 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 xcoff + +import ( + "encoding/binary" + "fmt" + "io" + "os" + "strconv" + "strings" +) + +const ( + SAIAMAG = 0x8 + AIAFMAG = "`\n" + AIAMAG = "<aiaff>\n" + AIAMAGBIG = "<bigaf>\n" + + // Sizeof + FL_HSZ_BIG = 0x80 + AR_HSZ_BIG = 0x70 +) + +type bigarFileHeader struct { + Flmagic [SAIAMAG]byte // Archive magic string + Flmemoff [20]byte // Member table offset + Flgstoff [20]byte // 32-bits global symtab offset + Flgst64off [20]byte // 64-bits global symtab offset + Flfstmoff [20]byte // First member offset + Fllstmoff [20]byte // Last member offset + Flfreeoff [20]byte // First member on free list offset +} + +type bigarMemberHeader struct { + Arsize [20]byte // File member size + Arnxtmem [20]byte // Next member pointer + Arprvmem [20]byte // Previous member pointer + Ardate [12]byte // File member date + Aruid [12]byte // File member uid + Argid [12]byte // File member gid + Armode [12]byte // File member mode (octal) + Arnamlen [4]byte // File member name length + // _ar_nam is removed because it's easier to get name without it. +} + +// Archive represents an open AIX big archive. +type Archive struct { + ArchiveHeader + Members []*Member + + closer io.Closer +} + +// MemberHeader holds information about a big archive file header +type ArchiveHeader struct { + magic string +} + +// Member represents a member of an AIX big archive. +type Member struct { + MemberHeader + sr *io.SectionReader +} + +// MemberHeader holds information about a big archive member +type MemberHeader struct { + Name string + Size uint64 +} + +// OpenArchive opens the named archive using os.Open and prepares it for use +// as an AIX big archive. +func OpenArchive(name string) (*Archive, error) { + f, err := os.Open(name) + if err != nil { + return nil, err + } + arch, err := NewArchive(f) + if err != nil { + f.Close() + return nil, err + } + arch.closer = f + return arch, nil +} + +// Close closes the Archive. +// If the Archive was created using NewArchive directly instead of OpenArchive, +// Close has no effect. +func (a *Archive) Close() error { + var err error + if a.closer != nil { + err = a.closer.Close() + a.closer = nil + } + return err +} + +// NewArchive creates a new Archive for accessing an AIX big archive in an underlying reader. +func NewArchive(r io.ReaderAt) (*Archive, error) { + parseDecimalBytes := func(b []byte) (int64, error) { + return strconv.ParseInt(strings.TrimSpace(string(b)), 10, 64) + } + sr := io.NewSectionReader(r, 0, 1<<63-1) + + // Read File Header + var magic [SAIAMAG]byte + if _, err := sr.ReadAt(magic[:], 0); err != nil { + return nil, err + } + + arch := new(Archive) + switch string(magic[:]) { + case AIAMAGBIG: + arch.magic = string(magic[:]) + case AIAMAG: + return nil, fmt.Errorf("small AIX archive not supported") + default: + return nil, fmt.Errorf("unrecognised archive magic: 0x%x", magic) + } + + var fhdr bigarFileHeader + if _, err := sr.Seek(0, os.SEEK_SET); err != nil { + return nil, err + } + if err := binary.Read(sr, binary.BigEndian, &fhdr); err != nil { + return nil, err + } + + off, err := parseDecimalBytes(fhdr.Flfstmoff[:]) + if err != nil { + return nil, fmt.Errorf("error parsing offset of first member in archive header(%q); %v", fhdr, err) + } + + if off == 0 { + // Occurs if the archive is empty. + return arch, nil + } + + lastoff, err := parseDecimalBytes(fhdr.Fllstmoff[:]) + if err != nil { + return nil, fmt.Errorf("error parsing offset of first member in archive header(%q); %v", fhdr, err) + } + + // Read members + for { + // Read Member Header + // The member header is normally 2 bytes larger. But it's easier + // to read the name if the header is read without _ar_nam. + // However, AIAFMAG must be read afterward. + if _, err := sr.Seek(off, os.SEEK_SET); err != nil { + return nil, err + } + + var mhdr bigarMemberHeader + if err := binary.Read(sr, binary.BigEndian, &mhdr); err != nil { + return nil, err + } + + member := new(Member) + arch.Members = append(arch.Members, member) + + size, err := parseDecimalBytes(mhdr.Arsize[:]) + if err != nil { + return nil, fmt.Errorf("error parsing size in member header(%q); %v", mhdr, err) + } + member.Size = uint64(size) + + // Read name + namlen, err := parseDecimalBytes(mhdr.Arnamlen[:]) + if err != nil { + return nil, fmt.Errorf("error parsing name length in member header(%q); %v", mhdr, err) + } + name := make([]byte, namlen) + if err := binary.Read(sr, binary.BigEndian, name); err != nil { + return nil, err + } + member.Name = string(name) + + fileoff := off + AR_HSZ_BIG + namlen + if fileoff&1 != 0 { + fileoff++ + if _, err := sr.Seek(1, os.SEEK_CUR); err != nil { + return nil, err + } + } + + // Read AIAFMAG string + var fmag [2]byte + if err := binary.Read(sr, binary.BigEndian, &fmag); err != nil { + return nil, err + } + if string(fmag[:]) != AIAFMAG { + return nil, fmt.Errorf("AIAFMAG not found after member header") + } + + fileoff += 2 // Add the two bytes of AIAFMAG + member.sr = io.NewSectionReader(sr, fileoff, size) + + if off == lastoff { + break + } + off, err = parseDecimalBytes(mhdr.Arnxtmem[:]) + if err != nil { + return nil, fmt.Errorf("error parsing offset of first member in archive header(%q); %v", fhdr, err) + } + + } + + return arch, nil + +} + +// GetFile returns the XCOFF file defined by member name. +// FIXME: This doesn't work if an archive has two members with the same +// name which can occur if a archive has both 32-bits and 64-bits files. +func (arch *Archive) GetFile(name string) (*File, error) { + for _, mem := range arch.Members { + if mem.Name == name { + return NewFile(mem.sr) + } + } + return nil, fmt.Errorf("unknown member %s in archive", name) + +} diff --git a/src/internal/xcoff/ar_test.go b/src/internal/xcoff/ar_test.go new file mode 100644 index 0000000..83333d6 --- /dev/null +++ b/src/internal/xcoff/ar_test.go @@ -0,0 +1,79 @@ +// Copyright 2018 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 xcoff + +import ( + "reflect" + "testing" +) + +type archiveTest struct { + file string + hdr ArchiveHeader + members []*MemberHeader + membersFileHeader []FileHeader +} + +var archTest = []archiveTest{ + { + "testdata/bigar-ppc64", + ArchiveHeader{AIAMAGBIG}, + []*MemberHeader{ + {"printbye.o", 836}, + {"printhello.o", 860}, + }, + []FileHeader{ + {U64_TOCMAGIC}, + {U64_TOCMAGIC}, + }, + }, + { + "testdata/bigar-empty", + ArchiveHeader{AIAMAGBIG}, + []*MemberHeader{}, + []FileHeader{}, + }, +} + +func TestOpenArchive(t *testing.T) { + for i := range archTest { + tt := &archTest[i] + arch, err := OpenArchive(tt.file) + if err != nil { + t.Error(err) + continue + } + if !reflect.DeepEqual(arch.ArchiveHeader, tt.hdr) { + t.Errorf("open archive %s:\n\thave %#v\n\twant %#v\n", tt.file, arch.ArchiveHeader, tt.hdr) + continue + } + + for i, mem := range arch.Members { + if i >= len(tt.members) { + break + } + have := &mem.MemberHeader + want := tt.members[i] + if !reflect.DeepEqual(have, want) { + t.Errorf("open %s, member %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want) + } + + f, err := arch.GetFile(mem.Name) + if err != nil { + t.Error(err) + continue + } + if !reflect.DeepEqual(f.FileHeader, tt.membersFileHeader[i]) { + t.Errorf("open %s, member file header %d:\n\thave %#v\n\twant %#v\n", tt.file, i, f.FileHeader, tt.membersFileHeader[i]) + } + } + tn := len(tt.members) + an := len(arch.Members) + if tn != an { + t.Errorf("open %s: len(Members) = %d, want %d", tt.file, an, tn) + } + + } +} diff --git a/src/internal/xcoff/file.go b/src/internal/xcoff/file.go new file mode 100644 index 0000000..05e4fd5 --- /dev/null +++ b/src/internal/xcoff/file.go @@ -0,0 +1,687 @@ +// Copyright 2018 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 xcoff implements access to XCOFF (Extended Common Object File Format) files. +package xcoff + +import ( + "debug/dwarf" + "encoding/binary" + "fmt" + "io" + "os" + "strings" +) + +// SectionHeader holds information about an XCOFF section header. +type SectionHeader struct { + Name string + VirtualAddress uint64 + Size uint64 + Type uint32 + Relptr uint64 + Nreloc uint32 +} + +type Section struct { + SectionHeader + Relocs []Reloc + io.ReaderAt + sr *io.SectionReader +} + +// AuxiliaryCSect holds information about an XCOFF symbol in an AUX_CSECT entry. +type AuxiliaryCSect struct { + Length int64 + StorageMappingClass int + SymbolType int +} + +// AuxiliaryFcn holds information about an XCOFF symbol in an AUX_FCN entry. +type AuxiliaryFcn struct { + Size int64 +} + +type Symbol struct { + Name string + Value uint64 + SectionNumber int + StorageClass int + AuxFcn AuxiliaryFcn + AuxCSect AuxiliaryCSect +} + +type Reloc struct { + VirtualAddress uint64 + Symbol *Symbol + Signed bool + InstructionFixed bool + Length uint8 + Type uint8 +} + +// ImportedSymbol holds information about an imported XCOFF symbol. +type ImportedSymbol struct { + Name string + Library string +} + +// FileHeader holds information about an XCOFF file header. +type FileHeader struct { + TargetMachine uint16 +} + +// A File represents an open XCOFF file. +type File struct { + FileHeader + Sections []*Section + Symbols []*Symbol + StringTable []byte + LibraryPaths []string + + closer io.Closer +} + +// Open opens the named file using os.Open and prepares it for use as an XCOFF 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 +} + +// Section returns the first section with the given name, or nil if no such +// section exists. +// Xcoff have section's name limited to 8 bytes. Some sections like .gosymtab +// can be trunked but this method will still find them. +func (f *File) Section(name string) *Section { + for _, s := range f.Sections { + if s.Name == name || (len(name) > 8 && s.Name == name[:8]) { + return s + } + } + return nil +} + +// SectionByType returns the first section in f with the +// given type, or nil if there is no such section. +func (f *File) SectionByType(typ uint32) *Section { + for _, s := range f.Sections { + if s.Type == typ { + return s + } + } + return nil +} + +// cstring converts ASCII byte sequence b to string. +// It stops once it finds 0 or reaches end of b. +func cstring(b []byte) string { + var i int + for i = 0; i < len(b) && b[i] != 0; i++ { + } + return string(b[:i]) +} + +// getString extracts a string from an XCOFF string table. +func getString(st []byte, offset uint32) (string, bool) { + if offset < 4 || int(offset) >= len(st) { + return "", false + } + return cstring(st[offset:]), true +} + +// NewFile creates a new File for accessing an XCOFF binary in an underlying reader. +func NewFile(r io.ReaderAt) (*File, error) { + sr := io.NewSectionReader(r, 0, 1<<63-1) + // Read XCOFF target machine + var magic uint16 + if err := binary.Read(sr, binary.BigEndian, &magic); err != nil { + return nil, err + } + if magic != U802TOCMAGIC && magic != U64_TOCMAGIC { + return nil, fmt.Errorf("unrecognised XCOFF magic: 0x%x", magic) + } + + f := new(File) + f.TargetMachine = magic + + // Read XCOFF file header + if _, err := sr.Seek(0, os.SEEK_SET); err != nil { + return nil, err + } + var nscns uint16 + var symptr uint64 + var nsyms int32 + var opthdr uint16 + var hdrsz int + switch f.TargetMachine { + case U802TOCMAGIC: + fhdr := new(FileHeader32) + if err := binary.Read(sr, binary.BigEndian, fhdr); err != nil { + return nil, err + } + nscns = fhdr.Fnscns + symptr = uint64(fhdr.Fsymptr) + nsyms = fhdr.Fnsyms + opthdr = fhdr.Fopthdr + hdrsz = FILHSZ_32 + case U64_TOCMAGIC: + fhdr := new(FileHeader64) + if err := binary.Read(sr, binary.BigEndian, fhdr); err != nil { + return nil, err + } + nscns = fhdr.Fnscns + symptr = fhdr.Fsymptr + nsyms = fhdr.Fnsyms + opthdr = fhdr.Fopthdr + hdrsz = FILHSZ_64 + } + + if symptr == 0 || nsyms <= 0 { + return nil, fmt.Errorf("no symbol table") + } + + // Read string table (located right after symbol table). + offset := symptr + uint64(nsyms)*SYMESZ + if _, err := sr.Seek(int64(offset), os.SEEK_SET); err != nil { + return nil, err + } + // The first 4 bytes contain the length (in bytes). + var l uint32 + if err := binary.Read(sr, binary.BigEndian, &l); err != nil { + return nil, err + } + if l > 4 { + if _, err := sr.Seek(int64(offset), os.SEEK_SET); err != nil { + return nil, err + } + f.StringTable = make([]byte, l) + if _, err := io.ReadFull(sr, f.StringTable); err != nil { + return nil, err + } + } + + // Read section headers + if _, err := sr.Seek(int64(hdrsz)+int64(opthdr), os.SEEK_SET); err != nil { + return nil, err + } + f.Sections = make([]*Section, nscns) + for i := 0; i < int(nscns); i++ { + var scnptr uint64 + s := new(Section) + switch f.TargetMachine { + case U802TOCMAGIC: + shdr := new(SectionHeader32) + if err := binary.Read(sr, binary.BigEndian, shdr); err != nil { + return nil, err + } + s.Name = cstring(shdr.Sname[:]) + s.VirtualAddress = uint64(shdr.Svaddr) + s.Size = uint64(shdr.Ssize) + scnptr = uint64(shdr.Sscnptr) + s.Type = shdr.Sflags + s.Relptr = uint64(shdr.Srelptr) + s.Nreloc = uint32(shdr.Snreloc) + case U64_TOCMAGIC: + shdr := new(SectionHeader64) + if err := binary.Read(sr, binary.BigEndian, shdr); err != nil { + return nil, err + } + s.Name = cstring(shdr.Sname[:]) + s.VirtualAddress = shdr.Svaddr + s.Size = shdr.Ssize + scnptr = shdr.Sscnptr + s.Type = shdr.Sflags + s.Relptr = shdr.Srelptr + s.Nreloc = shdr.Snreloc + } + r2 := r + if scnptr == 0 { // .bss must have all 0s + r2 = zeroReaderAt{} + } + s.sr = io.NewSectionReader(r2, int64(scnptr), int64(s.Size)) + s.ReaderAt = s.sr + f.Sections[i] = s + } + + // Symbol map needed by relocation + var idxToSym = make(map[int]*Symbol) + + // Read symbol table + if _, err := sr.Seek(int64(symptr), os.SEEK_SET); err != nil { + return nil, err + } + f.Symbols = make([]*Symbol, 0) + for i := 0; i < int(nsyms); i++ { + var numaux int + var ok, needAuxFcn bool + sym := new(Symbol) + switch f.TargetMachine { + case U802TOCMAGIC: + se := new(SymEnt32) + if err := binary.Read(sr, binary.BigEndian, se); err != nil { + return nil, err + } + numaux = int(se.Nnumaux) + sym.SectionNumber = int(se.Nscnum) + sym.StorageClass = int(se.Nsclass) + sym.Value = uint64(se.Nvalue) + needAuxFcn = se.Ntype&SYM_TYPE_FUNC != 0 && numaux > 1 + zeroes := binary.BigEndian.Uint32(se.Nname[:4]) + if zeroes != 0 { + sym.Name = cstring(se.Nname[:]) + } else { + offset := binary.BigEndian.Uint32(se.Nname[4:]) + sym.Name, ok = getString(f.StringTable, offset) + if !ok { + goto skip + } + } + case U64_TOCMAGIC: + se := new(SymEnt64) + if err := binary.Read(sr, binary.BigEndian, se); err != nil { + return nil, err + } + numaux = int(se.Nnumaux) + sym.SectionNumber = int(se.Nscnum) + sym.StorageClass = int(se.Nsclass) + sym.Value = se.Nvalue + needAuxFcn = se.Ntype&SYM_TYPE_FUNC != 0 && numaux > 1 + sym.Name, ok = getString(f.StringTable, se.Noffset) + if !ok { + goto skip + } + } + if sym.StorageClass != C_EXT && sym.StorageClass != C_WEAKEXT && sym.StorageClass != C_HIDEXT { + goto skip + } + // Must have at least one csect auxiliary entry. + if numaux < 1 || i+numaux >= int(nsyms) { + goto skip + } + + if sym.SectionNumber > int(nscns) { + goto skip + } + if sym.SectionNumber == 0 { + sym.Value = 0 + } else { + sym.Value -= f.Sections[sym.SectionNumber-1].VirtualAddress + } + + idxToSym[i] = sym + + // If this symbol is a function, it must retrieve its size from + // its AUX_FCN entry. + // It can happen that a function symbol doesn't have any AUX_FCN. + // In this case, needAuxFcn is false and their size will be set to 0. + if needAuxFcn { + switch f.TargetMachine { + case U802TOCMAGIC: + aux := new(AuxFcn32) + if err := binary.Read(sr, binary.BigEndian, aux); err != nil { + return nil, err + } + sym.AuxFcn.Size = int64(aux.Xfsize) + case U64_TOCMAGIC: + aux := new(AuxFcn64) + if err := binary.Read(sr, binary.BigEndian, aux); err != nil { + return nil, err + } + sym.AuxFcn.Size = int64(aux.Xfsize) + } + } + + // Read csect auxiliary entry (by convention, it is the last). + if !needAuxFcn { + if _, err := sr.Seek(int64(numaux-1)*SYMESZ, os.SEEK_CUR); err != nil { + return nil, err + } + } + i += numaux + numaux = 0 + switch f.TargetMachine { + case U802TOCMAGIC: + aux := new(AuxCSect32) + if err := binary.Read(sr, binary.BigEndian, aux); err != nil { + return nil, err + } + sym.AuxCSect.SymbolType = int(aux.Xsmtyp & 0x7) + sym.AuxCSect.StorageMappingClass = int(aux.Xsmclas) + sym.AuxCSect.Length = int64(aux.Xscnlen) + case U64_TOCMAGIC: + aux := new(AuxCSect64) + if err := binary.Read(sr, binary.BigEndian, aux); err != nil { + return nil, err + } + sym.AuxCSect.SymbolType = int(aux.Xsmtyp & 0x7) + sym.AuxCSect.StorageMappingClass = int(aux.Xsmclas) + sym.AuxCSect.Length = int64(aux.Xscnlenhi)<<32 | int64(aux.Xscnlenlo) + } + f.Symbols = append(f.Symbols, sym) + skip: + i += numaux // Skip auxiliary entries + if _, err := sr.Seek(int64(numaux)*SYMESZ, os.SEEK_CUR); err != nil { + return nil, err + } + } + + // Read relocations + // Only for .data or .text section + for _, sect := range f.Sections { + if sect.Type != STYP_TEXT && sect.Type != STYP_DATA { + continue + } + sect.Relocs = make([]Reloc, sect.Nreloc) + if sect.Relptr == 0 { + continue + } + if _, err := sr.Seek(int64(sect.Relptr), os.SEEK_SET); err != nil { + return nil, err + } + for i := uint32(0); i < sect.Nreloc; i++ { + switch f.TargetMachine { + case U802TOCMAGIC: + rel := new(Reloc32) + if err := binary.Read(sr, binary.BigEndian, rel); err != nil { + return nil, err + } + sect.Relocs[i].VirtualAddress = uint64(rel.Rvaddr) + sect.Relocs[i].Symbol = idxToSym[int(rel.Rsymndx)] + sect.Relocs[i].Type = rel.Rtype + sect.Relocs[i].Length = rel.Rsize&0x3F + 1 + + if rel.Rsize&0x80 != 0 { + sect.Relocs[i].Signed = true + } + if rel.Rsize&0x40 != 0 { + sect.Relocs[i].InstructionFixed = true + } + + case U64_TOCMAGIC: + rel := new(Reloc64) + if err := binary.Read(sr, binary.BigEndian, rel); err != nil { + return nil, err + } + sect.Relocs[i].VirtualAddress = rel.Rvaddr + sect.Relocs[i].Symbol = idxToSym[int(rel.Rsymndx)] + sect.Relocs[i].Type = rel.Rtype + sect.Relocs[i].Length = rel.Rsize&0x3F + 1 + if rel.Rsize&0x80 != 0 { + sect.Relocs[i].Signed = true + } + if rel.Rsize&0x40 != 0 { + sect.Relocs[i].InstructionFixed = true + } + } + } + } + + 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 +} + +// Data reads and returns the contents of the XCOFF section s. +func (s *Section) Data() ([]byte, error) { + dat := make([]byte, s.sr.Size()) + n, err := s.sr.ReadAt(dat, 0) + if n == len(dat) { + err = nil + } + return dat[:n], err +} + +// CSect reads and returns the contents of a csect. +func (f *File) CSect(name string) []byte { + for _, sym := range f.Symbols { + if sym.Name == name && sym.AuxCSect.SymbolType == XTY_SD { + if i := sym.SectionNumber - 1; 0 <= i && i < len(f.Sections) { + s := f.Sections[i] + if sym.Value+uint64(sym.AuxCSect.Length) <= s.Size { + dat := make([]byte, sym.AuxCSect.Length) + _, err := s.sr.ReadAt(dat, int64(sym.Value)) + if err != nil { + return nil + } + return dat + } + } + break + } + } + return nil +} + +func (f *File) DWARF() (*dwarf.Data, error) { + // There are many other DWARF sections, but these + // are the ones the debug/dwarf package uses. + // Don't bother loading others. + var subtypes = [...]uint32{SSUBTYP_DWABREV, SSUBTYP_DWINFO, SSUBTYP_DWLINE, SSUBTYP_DWRNGES, SSUBTYP_DWSTR} + var dat [len(subtypes)][]byte + for i, subtype := range subtypes { + s := f.SectionByType(STYP_DWARF | subtype) + if s != nil { + b, err := s.Data() + if err != nil && uint64(len(b)) < s.Size { + return nil, err + } + dat[i] = b + } + } + + abbrev, info, line, ranges, str := dat[0], dat[1], dat[2], dat[3], dat[4] + return dwarf.New(abbrev, nil, nil, info, line, nil, ranges, str) +} + +// readImportID returns the import file IDs stored inside the .loader section. +// Library name pattern is either path/base/member or base/member +func (f *File) readImportIDs(s *Section) ([]string, error) { + // Read loader header + if _, err := s.sr.Seek(0, os.SEEK_SET); err != nil { + return nil, err + } + var istlen uint32 + var nimpid int32 + var impoff uint64 + switch f.TargetMachine { + case U802TOCMAGIC: + lhdr := new(LoaderHeader32) + if err := binary.Read(s.sr, binary.BigEndian, lhdr); err != nil { + return nil, err + } + istlen = lhdr.Listlen + nimpid = lhdr.Lnimpid + impoff = uint64(lhdr.Limpoff) + case U64_TOCMAGIC: + lhdr := new(LoaderHeader64) + if err := binary.Read(s.sr, binary.BigEndian, lhdr); err != nil { + return nil, err + } + istlen = lhdr.Listlen + nimpid = lhdr.Lnimpid + impoff = lhdr.Limpoff + } + + // Read loader import file ID table + if _, err := s.sr.Seek(int64(impoff), os.SEEK_SET); err != nil { + return nil, err + } + table := make([]byte, istlen) + if _, err := io.ReadFull(s.sr, table); err != nil { + return nil, err + } + + offset := 0 + // First import file ID is the default LIBPATH value + libpath := cstring(table[offset:]) + f.LibraryPaths = strings.Split(libpath, ":") + offset += len(libpath) + 3 // 3 null bytes + all := make([]string, 0) + for i := 1; i < int(nimpid); i++ { + impidpath := cstring(table[offset:]) + offset += len(impidpath) + 1 + impidbase := cstring(table[offset:]) + offset += len(impidbase) + 1 + impidmem := cstring(table[offset:]) + offset += len(impidmem) + 1 + var path string + if len(impidpath) > 0 { + path = impidpath + "/" + impidbase + "/" + impidmem + } else { + path = impidbase + "/" + impidmem + } + all = append(all, path) + } + + return all, 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. +// It does not return weak symbols. +func (f *File) ImportedSymbols() ([]ImportedSymbol, error) { + s := f.SectionByType(STYP_LOADER) + if s == nil { + return nil, nil + } + // Read loader header + if _, err := s.sr.Seek(0, os.SEEK_SET); err != nil { + return nil, err + } + var stlen uint32 + var stoff uint64 + var nsyms int32 + var symoff uint64 + switch f.TargetMachine { + case U802TOCMAGIC: + lhdr := new(LoaderHeader32) + if err := binary.Read(s.sr, binary.BigEndian, lhdr); err != nil { + return nil, err + } + stlen = lhdr.Lstlen + stoff = uint64(lhdr.Lstoff) + nsyms = lhdr.Lnsyms + symoff = LDHDRSZ_32 + case U64_TOCMAGIC: + lhdr := new(LoaderHeader64) + if err := binary.Read(s.sr, binary.BigEndian, lhdr); err != nil { + return nil, err + } + stlen = lhdr.Lstlen + stoff = lhdr.Lstoff + nsyms = lhdr.Lnsyms + symoff = lhdr.Lsymoff + } + + // Read loader section string table + if _, err := s.sr.Seek(int64(stoff), os.SEEK_SET); err != nil { + return nil, err + } + st := make([]byte, stlen) + if _, err := io.ReadFull(s.sr, st); err != nil { + return nil, err + } + + // Read imported libraries + libs, err := f.readImportIDs(s) + if err != nil { + return nil, err + } + + // Read loader symbol table + if _, err := s.sr.Seek(int64(symoff), os.SEEK_SET); err != nil { + return nil, err + } + all := make([]ImportedSymbol, 0) + for i := 0; i < int(nsyms); i++ { + var name string + var ifile int32 + var ok bool + switch f.TargetMachine { + case U802TOCMAGIC: + ldsym := new(LoaderSymbol32) + if err := binary.Read(s.sr, binary.BigEndian, ldsym); err != nil { + return nil, err + } + if ldsym.Lsmtype&0x40 == 0 { + continue // Imported symbols only + } + zeroes := binary.BigEndian.Uint32(ldsym.Lname[:4]) + if zeroes != 0 { + name = cstring(ldsym.Lname[:]) + } else { + offset := binary.BigEndian.Uint32(ldsym.Lname[4:]) + name, ok = getString(st, offset) + if !ok { + continue + } + } + ifile = ldsym.Lifile + case U64_TOCMAGIC: + ldsym := new(LoaderSymbol64) + if err := binary.Read(s.sr, binary.BigEndian, ldsym); err != nil { + return nil, err + } + if ldsym.Lsmtype&0x40 == 0 { + continue // Imported symbols only + } + name, ok = getString(st, ldsym.Loffset) + if !ok { + continue + } + ifile = ldsym.Lifile + } + var sym ImportedSymbol + sym.Name = name + if ifile >= 1 && int(ifile) <= len(libs) { + sym.Library = libs[ifile-1] + } + all = append(all, sym) + } + + 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) { + s := f.SectionByType(STYP_LOADER) + if s == nil { + return nil, nil + } + all, err := f.readImportIDs(s) + return all, err +} diff --git a/src/internal/xcoff/file_test.go b/src/internal/xcoff/file_test.go new file mode 100644 index 0000000..a6722e9 --- /dev/null +++ b/src/internal/xcoff/file_test.go @@ -0,0 +1,102 @@ +// Copyright 2018 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 xcoff + +import ( + "reflect" + "testing" +) + +type fileTest struct { + file string + hdr FileHeader + sections []*SectionHeader + needed []string +} + +var fileTests = []fileTest{ + { + "testdata/gcc-ppc32-aix-dwarf2-exec", + FileHeader{U802TOCMAGIC}, + []*SectionHeader{ + {".text", 0x10000290, 0x00000bbd, STYP_TEXT, 0x7ae6, 0x36}, + {".data", 0x20000e4d, 0x00000437, STYP_DATA, 0x7d02, 0x2b}, + {".bss", 0x20001284, 0x0000021c, STYP_BSS, 0, 0}, + {".loader", 0x00000000, 0x000004b3, STYP_LOADER, 0, 0}, + {".dwline", 0x00000000, 0x000000df, STYP_DWARF | SSUBTYP_DWLINE, 0x7eb0, 0x7}, + {".dwinfo", 0x00000000, 0x00000314, STYP_DWARF | SSUBTYP_DWINFO, 0x7ef6, 0xa}, + {".dwabrev", 0x00000000, 0x000000d6, STYP_DWARF | SSUBTYP_DWABREV, 0, 0}, + {".dwarnge", 0x00000000, 0x00000020, STYP_DWARF | SSUBTYP_DWARNGE, 0x7f5a, 0x2}, + {".dwloc", 0x00000000, 0x00000074, STYP_DWARF | SSUBTYP_DWLOC, 0, 0}, + {".debug", 0x00000000, 0x00005e4f, STYP_DEBUG, 0, 0}, + }, + []string{"libc.a/shr.o"}, + }, + { + "testdata/gcc-ppc64-aix-dwarf2-exec", + FileHeader{U64_TOCMAGIC}, + []*SectionHeader{ + {".text", 0x10000480, 0x00000afd, STYP_TEXT, 0x8322, 0x34}, + {".data", 0x20000f7d, 0x000002f3, STYP_DATA, 0x85fa, 0x25}, + {".bss", 0x20001270, 0x00000428, STYP_BSS, 0, 0}, + {".loader", 0x00000000, 0x00000535, STYP_LOADER, 0, 0}, + {".dwline", 0x00000000, 0x000000b4, STYP_DWARF | SSUBTYP_DWLINE, 0x8800, 0x4}, + {".dwinfo", 0x00000000, 0x0000036a, STYP_DWARF | SSUBTYP_DWINFO, 0x8838, 0x7}, + {".dwabrev", 0x00000000, 0x000000b5, STYP_DWARF | SSUBTYP_DWABREV, 0, 0}, + {".dwarnge", 0x00000000, 0x00000040, STYP_DWARF | SSUBTYP_DWARNGE, 0x889a, 0x2}, + {".dwloc", 0x00000000, 0x00000062, STYP_DWARF | SSUBTYP_DWLOC, 0, 0}, + {".debug", 0x00000000, 0x00006605, STYP_DEBUG, 0, 0}, + }, + []string{"libc.a/shr_64.o"}, + }, +} + +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) + } + tl := tt.needed + fl, err := f.ImportedLibraries() + if err != nil { + t.Error(err) + } + if !reflect.DeepEqual(tl, fl) { + t.Errorf("open %s: loader import = %v, want %v", tt.file, tl, fl) + } + } +} + +func TestOpenFailure(t *testing.T) { + filename := "file.go" // not an XCOFF object file + _, err := Open(filename) // don't crash + if err == nil { + t.Errorf("open %s: succeeded unexpectedly", filename) + } +} diff --git a/src/internal/xcoff/testdata/bigar-empty b/src/internal/xcoff/testdata/bigar-empty new file mode 100644 index 0000000..851ccc5 --- /dev/null +++ b/src/internal/xcoff/testdata/bigar-empty @@ -0,0 +1,2 @@ +<bigaf> +0 0 0 0 0 0
\ No newline at end of file diff --git a/src/internal/xcoff/testdata/bigar-ppc64 b/src/internal/xcoff/testdata/bigar-ppc64 Binary files differnew file mode 100644 index 0000000..a8d4979 --- /dev/null +++ b/src/internal/xcoff/testdata/bigar-ppc64 diff --git a/src/internal/xcoff/testdata/gcc-ppc32-aix-dwarf2-exec b/src/internal/xcoff/testdata/gcc-ppc32-aix-dwarf2-exec Binary files differnew file mode 100644 index 0000000..810e21a --- /dev/null +++ b/src/internal/xcoff/testdata/gcc-ppc32-aix-dwarf2-exec diff --git a/src/internal/xcoff/testdata/gcc-ppc64-aix-dwarf2-exec b/src/internal/xcoff/testdata/gcc-ppc64-aix-dwarf2-exec Binary files differnew file mode 100644 index 0000000..707d01e --- /dev/null +++ b/src/internal/xcoff/testdata/gcc-ppc64-aix-dwarf2-exec diff --git a/src/internal/xcoff/testdata/hello.c b/src/internal/xcoff/testdata/hello.c new file mode 100644 index 0000000..34d9ee7 --- /dev/null +++ b/src/internal/xcoff/testdata/hello.c @@ -0,0 +1,7 @@ +#include <stdio.h> + +void +main(int argc, char *argv[]) +{ + printf("hello, world\n"); +} diff --git a/src/internal/xcoff/testdata/printbye.c b/src/internal/xcoff/testdata/printbye.c new file mode 100644 index 0000000..9045079 --- /dev/null +++ b/src/internal/xcoff/testdata/printbye.c @@ -0,0 +1,5 @@ +#include <stdio.h> + +void printbye(){ + printf("Goodbye\n"); +} diff --git a/src/internal/xcoff/testdata/printhello.c b/src/internal/xcoff/testdata/printhello.c new file mode 100644 index 0000000..182aa09 --- /dev/null +++ b/src/internal/xcoff/testdata/printhello.c @@ -0,0 +1,5 @@ +#include <stdio.h> + +void printhello(){ + printf("Helloworld\n"); +} diff --git a/src/internal/xcoff/xcoff.go b/src/internal/xcoff/xcoff.go new file mode 100644 index 0000000..f8465d7 --- /dev/null +++ b/src/internal/xcoff/xcoff.go @@ -0,0 +1,367 @@ +// Copyright 2018 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 xcoff + +// File Header. +type FileHeader32 struct { + Fmagic uint16 // Target machine + Fnscns uint16 // Number of sections + Ftimedat int32 // Time and date of file creation + Fsymptr uint32 // Byte offset to symbol table start + Fnsyms int32 // Number of entries in symbol table + Fopthdr uint16 // Number of bytes in optional header + Fflags uint16 // Flags +} + +type FileHeader64 struct { + Fmagic uint16 // Target machine + Fnscns uint16 // Number of sections + Ftimedat int32 // Time and date of file creation + Fsymptr uint64 // Byte offset to symbol table start + Fopthdr uint16 // Number of bytes in optional header + Fflags uint16 // Flags + Fnsyms int32 // Number of entries in symbol table +} + +const ( + FILHSZ_32 = 20 + FILHSZ_64 = 24 +) +const ( + U802TOCMAGIC = 0737 // AIX 32-bit XCOFF + U64_TOCMAGIC = 0767 // AIX 64-bit XCOFF +) + +// Flags that describe the type of the object file. +const ( + F_RELFLG = 0x0001 + F_EXEC = 0x0002 + F_LNNO = 0x0004 + F_FDPR_PROF = 0x0010 + F_FDPR_OPTI = 0x0020 + F_DSA = 0x0040 + F_VARPG = 0x0100 + F_DYNLOAD = 0x1000 + F_SHROBJ = 0x2000 + F_LOADONLY = 0x4000 +) + +// Section Header. +type SectionHeader32 struct { + Sname [8]byte // Section name + Spaddr uint32 // Physical address + Svaddr uint32 // Virtual address + Ssize uint32 // Section size + Sscnptr uint32 // Offset in file to raw data for section + Srelptr uint32 // Offset in file to relocation entries for section + Slnnoptr uint32 // Offset in file to line number entries for section + Snreloc uint16 // Number of relocation entries + Snlnno uint16 // Number of line number entries + Sflags uint32 // Flags to define the section type +} + +type SectionHeader64 struct { + Sname [8]byte // Section name + Spaddr uint64 // Physical address + Svaddr uint64 // Virtual address + Ssize uint64 // Section size + Sscnptr uint64 // Offset in file to raw data for section + Srelptr uint64 // Offset in file to relocation entries for section + Slnnoptr uint64 // Offset in file to line number entries for section + Snreloc uint32 // Number of relocation entries + Snlnno uint32 // Number of line number entries + Sflags uint32 // Flags to define the section type + Spad uint32 // Needs to be 72 bytes long +} + +// Flags defining the section type. +const ( + STYP_DWARF = 0x0010 + STYP_TEXT = 0x0020 + STYP_DATA = 0x0040 + STYP_BSS = 0x0080 + STYP_EXCEPT = 0x0100 + STYP_INFO = 0x0200 + STYP_TDATA = 0x0400 + STYP_TBSS = 0x0800 + STYP_LOADER = 0x1000 + STYP_DEBUG = 0x2000 + STYP_TYPCHK = 0x4000 + STYP_OVRFLO = 0x8000 +) +const ( + SSUBTYP_DWINFO = 0x10000 // DWARF info section + SSUBTYP_DWLINE = 0x20000 // DWARF line-number section + SSUBTYP_DWPBNMS = 0x30000 // DWARF public names section + SSUBTYP_DWPBTYP = 0x40000 // DWARF public types section + SSUBTYP_DWARNGE = 0x50000 // DWARF aranges section + SSUBTYP_DWABREV = 0x60000 // DWARF abbreviation section + SSUBTYP_DWSTR = 0x70000 // DWARF strings section + SSUBTYP_DWRNGES = 0x80000 // DWARF ranges section + SSUBTYP_DWLOC = 0x90000 // DWARF location lists section + SSUBTYP_DWFRAME = 0xA0000 // DWARF frames section + SSUBTYP_DWMAC = 0xB0000 // DWARF macros section +) + +// Symbol Table Entry. +type SymEnt32 struct { + Nname [8]byte // Symbol name + Nvalue uint32 // Symbol value + Nscnum int16 // Section number of symbol + Ntype uint16 // Basic and derived type specification + Nsclass int8 // Storage class of symbol + Nnumaux int8 // Number of auxiliary entries +} + +type SymEnt64 struct { + Nvalue uint64 // Symbol value + Noffset uint32 // Offset of the name in string table or .debug section + Nscnum int16 // Section number of symbol + Ntype uint16 // Basic and derived type specification + Nsclass int8 // Storage class of symbol + Nnumaux int8 // Number of auxiliary entries +} + +const SYMESZ = 18 + +const ( + // Nscnum + N_DEBUG = -2 + N_ABS = -1 + N_UNDEF = 0 + + //Ntype + SYM_V_INTERNAL = 0x1000 + SYM_V_HIDDEN = 0x2000 + SYM_V_PROTECTED = 0x3000 + SYM_V_EXPORTED = 0x4000 + SYM_TYPE_FUNC = 0x0020 // is function +) + +// Storage Class. +const ( + C_NULL = 0 // Symbol table entry marked for deletion + C_EXT = 2 // External symbol + C_STAT = 3 // Static symbol + C_BLOCK = 100 // Beginning or end of inner block + C_FCN = 101 // Beginning or end of function + C_FILE = 103 // Source file name and compiler information + C_HIDEXT = 107 // Unnamed external symbol + C_BINCL = 108 // Beginning of include file + C_EINCL = 109 // End of include file + C_WEAKEXT = 111 // Weak external symbol + C_DWARF = 112 // DWARF symbol + C_GSYM = 128 // Global variable + C_LSYM = 129 // Automatic variable allocated on stack + C_PSYM = 130 // Argument to subroutine allocated on stack + C_RSYM = 131 // Register variable + C_RPSYM = 132 // Argument to function or procedure stored in register + C_STSYM = 133 // Statically allocated symbol + C_BCOMM = 135 // Beginning of common block + C_ECOML = 136 // Local member of common block + C_ECOMM = 137 // End of common block + C_DECL = 140 // Declaration of object + C_ENTRY = 141 // Alternate entry + C_FUN = 142 // Function or procedure + C_BSTAT = 143 // Beginning of static block + C_ESTAT = 144 // End of static block + C_GTLS = 145 // Global thread-local variable + C_STTLS = 146 // Static thread-local variable +) + +// File Auxiliary Entry +type AuxFile64 struct { + Xfname [8]byte // Name or offset inside string table + Xftype uint8 // Source file string type + Xauxtype uint8 // Type of auxiliary entry +} + +// Function Auxiliary Entry +type AuxFcn32 struct { + Xexptr uint32 // File offset to exception table entry + Xfsize uint32 // Size of function in bytes + Xlnnoptr uint32 // File pointer to line number + Xendndx uint32 // Symbol table index of next entry + Xpad uint16 // Unused +} +type AuxFcn64 struct { + Xlnnoptr uint64 // File pointer to line number + Xfsize uint32 // Size of function in bytes + Xendndx uint32 // Symbol table index of next entry + Xpad uint8 // Unused + Xauxtype uint8 // Type of auxiliary entry +} + +type AuxSect64 struct { + Xscnlen uint64 // section length + Xnreloc uint64 // Num RLDs + pad uint8 + Xauxtype uint8 // Type of auxiliary entry +} + +// csect Auxiliary Entry. +type AuxCSect32 struct { + Xscnlen int32 // Length or symbol table index + Xparmhash uint32 // Offset of parameter type-check string + Xsnhash uint16 // .typchk section number + Xsmtyp uint8 // Symbol alignment and type + Xsmclas uint8 // Storage-mapping class + Xstab uint32 // Reserved + Xsnstab uint16 // Reserved +} + +type AuxCSect64 struct { + Xscnlenlo uint32 // Lower 4 bytes of length or symbol table index + Xparmhash uint32 // Offset of parameter type-check string + Xsnhash uint16 // .typchk section number + Xsmtyp uint8 // Symbol alignment and type + Xsmclas uint8 // Storage-mapping class + Xscnlenhi int32 // Upper 4 bytes of length or symbol table index + Xpad uint8 // Unused + Xauxtype uint8 // Type of auxiliary entry +} + +// Auxiliary type +const ( + _AUX_EXCEPT = 255 + _AUX_FCN = 254 + _AUX_SYM = 253 + _AUX_FILE = 252 + _AUX_CSECT = 251 + _AUX_SECT = 250 +) + +// Symbol type field. +const ( + XTY_ER = 0 // External reference + XTY_SD = 1 // Section definition + XTY_LD = 2 // Label definition + XTY_CM = 3 // Common csect definition +) + +// Defines for File auxiliary definitions: x_ftype field of x_file +const ( + XFT_FN = 0 // Source File Name + XFT_CT = 1 // Compile Time Stamp + XFT_CV = 2 // Compiler Version Number + XFT_CD = 128 // Compiler Defined Information +) + +// Storage-mapping class. +const ( + XMC_PR = 0 // Program code + XMC_RO = 1 // Read-only constant + XMC_DB = 2 // Debug dictionary table + XMC_TC = 3 // TOC entry + XMC_UA = 4 // Unclassified + XMC_RW = 5 // Read/Write data + XMC_GL = 6 // Global linkage + XMC_XO = 7 // Extended operation + XMC_SV = 8 // 32-bit supervisor call descriptor + XMC_BS = 9 // BSS class + XMC_DS = 10 // Function descriptor + XMC_UC = 11 // Unnamed FORTRAN common + XMC_TC0 = 15 // TOC anchor + XMC_TD = 16 // Scalar data entry in the TOC + XMC_SV64 = 17 // 64-bit supervisor call descriptor + XMC_SV3264 = 18 // Supervisor call descriptor for both 32-bit and 64-bit + XMC_TL = 20 // Read/Write thread-local data + XMC_UL = 21 // Read/Write thread-local data (.tbss) + XMC_TE = 22 // TOC entry +) + +// Loader Header. +type LoaderHeader32 struct { + Lversion int32 // Loader section version number + Lnsyms int32 // Number of symbol table entries + Lnreloc int32 // Number of relocation table entries + Listlen uint32 // Length of import file ID string table + Lnimpid int32 // Number of import file IDs + Limpoff uint32 // Offset to start of import file IDs + Lstlen uint32 // Length of string table + Lstoff uint32 // Offset to start of string table +} + +type LoaderHeader64 struct { + Lversion int32 // Loader section version number + Lnsyms int32 // Number of symbol table entries + Lnreloc int32 // Number of relocation table entries + Listlen uint32 // Length of import file ID string table + Lnimpid int32 // Number of import file IDs + Lstlen uint32 // Length of string table + Limpoff uint64 // Offset to start of import file IDs + Lstoff uint64 // Offset to start of string table + Lsymoff uint64 // Offset to start of symbol table + Lrldoff uint64 // Offset to start of relocation entries +} + +const ( + LDHDRSZ_32 = 32 + LDHDRSZ_64 = 56 +) + +// Loader Symbol. +type LoaderSymbol32 struct { + Lname [8]byte // Symbol name or byte offset into string table + Lvalue uint32 // Address field + Lscnum int16 // Section number containing symbol + Lsmtype int8 // Symbol type, export, import flags + Lsmclas int8 // Symbol storage class + Lifile int32 // Import file ID; ordinal of import file IDs + Lparm uint32 // Parameter type-check field +} + +type LoaderSymbol64 struct { + Lvalue uint64 // Address field + Loffset uint32 // Byte offset into string table of symbol name + Lscnum int16 // Section number containing symbol + Lsmtype int8 // Symbol type, export, import flags + Lsmclas int8 // Symbol storage class + Lifile int32 // Import file ID; ordinal of import file IDs + Lparm uint32 // Parameter type-check field +} + +type Reloc32 struct { + Rvaddr uint32 // (virtual) address of reference + Rsymndx uint32 // Index into symbol table + Rsize uint8 // Sign and reloc bit len + Rtype uint8 // Toc relocation type +} + +type Reloc64 struct { + Rvaddr uint64 // (virtual) address of reference + Rsymndx uint32 // Index into symbol table + Rsize uint8 // Sign and reloc bit len + Rtype uint8 // Toc relocation type +} + +const ( + R_POS = 0x00 // A(sym) Positive Relocation + R_NEG = 0x01 // -A(sym) Negative Relocation + R_REL = 0x02 // A(sym-*) Relative to self + R_TOC = 0x03 // A(sym-TOC) Relative to TOC + R_TRL = 0x12 // A(sym-TOC) TOC Relative indirect load. + + R_TRLA = 0x13 // A(sym-TOC) TOC Rel load address. modifiable inst + R_GL = 0x05 // A(external TOC of sym) Global Linkage + R_TCL = 0x06 // A(local TOC of sym) Local object TOC address + R_RL = 0x0C // A(sym) Pos indirect load. modifiable instruction + R_RLA = 0x0D // A(sym) Pos Load Address. modifiable instruction + R_REF = 0x0F // AL0(sym) Non relocating ref. No garbage collect + R_BA = 0x08 // A(sym) Branch absolute. Cannot modify instruction + R_RBA = 0x18 // A(sym) Branch absolute. modifiable instruction + R_BR = 0x0A // A(sym-*) Branch rel to self. non modifiable + R_RBR = 0x1A // A(sym-*) Branch rel to self. modifiable instr + + R_TLS = 0x20 // General-dynamic reference to TLS symbol + R_TLS_IE = 0x21 // Initial-exec reference to TLS symbol + R_TLS_LD = 0x22 // Local-dynamic reference to TLS symbol + R_TLS_LE = 0x23 // Local-exec reference to TLS symbol + R_TLSM = 0x24 // Module reference to TLS symbol + R_TLSML = 0x25 // Module reference to local (own) module + + R_TOCU = 0x30 // Relative to TOC - high order bits + R_TOCL = 0x31 // Relative to TOC - low order bits +) |