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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:23:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 19:23:18 +0000
commit43a123c1ae6613b3efeed291fa552ecd909d3acf (patch)
treefd92518b7024bc74031f78a1cf9e454b65e73665 /src/cmd/internal/objfile/xcoff.go
parentInitial commit. (diff)
downloadgolang-1.20-upstream.tar.xz
golang-1.20-upstream.zip
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/cmd/internal/objfile/xcoff.go163
1 files changed, 163 insertions, 0 deletions
diff --git a/src/cmd/internal/objfile/xcoff.go b/src/cmd/internal/objfile/xcoff.go
new file mode 100644
index 0000000..d6df4db
--- /dev/null
+++ b/src/cmd/internal/objfile/xcoff.go
@@ -0,0 +1,163 @@
+// 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.
+
+// Parsing of XCOFF executable (AIX)
+
+package objfile
+
+import (
+ "debug/dwarf"
+ "fmt"
+ "internal/xcoff"
+ "io"
+ "unicode"
+)
+
+type xcoffFile struct {
+ xcoff *xcoff.File
+}
+
+func openXcoff(r io.ReaderAt) (rawFile, error) {
+ f, err := xcoff.NewFile(r)
+ if err != nil {
+ return nil, err
+ }
+ return &xcoffFile{f}, nil
+}
+
+func (f *xcoffFile) symbols() ([]Sym, error) {
+ var syms []Sym
+ for _, s := range f.xcoff.Symbols {
+ const (
+ N_UNDEF = 0 // An undefined (extern) symbol
+ N_ABS = -1 // An absolute symbol (e_value is a constant, not an address)
+ N_DEBUG = -2 // A debugging symbol
+ )
+ sym := Sym{Name: s.Name, Addr: s.Value, Code: '?'}
+
+ switch s.SectionNumber {
+ case N_UNDEF:
+ sym.Code = 'U'
+ case N_ABS:
+ sym.Code = 'C'
+ case N_DEBUG:
+ sym.Code = '?'
+ default:
+ if s.SectionNumber < 0 || len(f.xcoff.Sections) < int(s.SectionNumber) {
+ return nil, fmt.Errorf("invalid section number in symbol table")
+ }
+ sect := f.xcoff.Sections[s.SectionNumber-1]
+
+ // debug/xcoff returns an offset in the section not the actual address
+ sym.Addr += sect.VirtualAddress
+
+ if s.AuxCSect.SymbolType&0x3 == xcoff.XTY_LD {
+ // The size of a function is contained in the
+ // AUX_FCN entry
+ sym.Size = s.AuxFcn.Size
+ } else {
+ sym.Size = s.AuxCSect.Length
+ }
+
+ sym.Size = s.AuxCSect.Length
+
+ switch sect.Type {
+ case xcoff.STYP_TEXT:
+ if s.AuxCSect.StorageMappingClass == xcoff.XMC_RO {
+ sym.Code = 'R'
+ } else {
+ sym.Code = 'T'
+ }
+ case xcoff.STYP_DATA:
+ sym.Code = 'D'
+ case xcoff.STYP_BSS:
+ sym.Code = 'B'
+ }
+
+ if s.StorageClass == xcoff.C_HIDEXT {
+ // Local symbol
+ sym.Code = unicode.ToLower(sym.Code)
+ }
+
+ }
+ syms = append(syms, sym)
+ }
+
+ return syms, nil
+}
+
+func (f *xcoffFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
+ if sect := f.xcoff.Section(".text"); sect != nil {
+ textStart = sect.VirtualAddress
+ }
+ if pclntab, err = loadXCOFFTable(f.xcoff, "runtime.pclntab", "runtime.epclntab"); err != nil {
+ return 0, nil, nil, err
+ }
+ symtab, _ = loadXCOFFTable(f.xcoff, "runtime.symtab", "runtime.esymtab") // ignore error, this symbol is not useful anyway
+ return textStart, symtab, pclntab, nil
+}
+
+func (f *xcoffFile) text() (textStart uint64, text []byte, err error) {
+ sect := f.xcoff.Section(".text")
+ if sect == nil {
+ return 0, nil, fmt.Errorf("text section not found")
+ }
+ textStart = sect.VirtualAddress
+ text, err = sect.Data()
+ return
+}
+
+func findXCOFFSymbol(f *xcoff.File, name string) (*xcoff.Symbol, error) {
+ for _, s := range f.Symbols {
+ if s.Name != name {
+ continue
+ }
+ if s.SectionNumber <= 0 {
+ return nil, fmt.Errorf("symbol %s: invalid section number %d", name, s.SectionNumber)
+ }
+ if len(f.Sections) < int(s.SectionNumber) {
+ return nil, fmt.Errorf("symbol %s: section number %d is larger than max %d", name, s.SectionNumber, len(f.Sections))
+ }
+ return s, nil
+ }
+ return nil, fmt.Errorf("no %s symbol found", name)
+}
+
+func loadXCOFFTable(f *xcoff.File, sname, ename string) ([]byte, error) {
+ ssym, err := findXCOFFSymbol(f, sname)
+ if err != nil {
+ return nil, err
+ }
+ esym, err := findXCOFFSymbol(f, ename)
+ if err != nil {
+ return nil, err
+ }
+ if ssym.SectionNumber != esym.SectionNumber {
+ return nil, fmt.Errorf("%s and %s symbols must be in the same section", sname, ename)
+ }
+ sect := f.Sections[ssym.SectionNumber-1]
+ data, err := sect.Data()
+ if err != nil {
+ return nil, err
+ }
+ return data[ssym.Value:esym.Value], nil
+}
+
+func (f *xcoffFile) goarch() string {
+ switch f.xcoff.TargetMachine {
+ case xcoff.U802TOCMAGIC:
+ return "ppc"
+ case xcoff.U64_TOCMAGIC:
+ return "ppc64"
+ }
+ return ""
+}
+
+func (f *xcoffFile) loadAddress() (uint64, error) {
+ return 0, fmt.Errorf("unknown load address")
+}
+
+func (f *xcoffFile) dwarf() (*dwarf.Data, error) {
+ return f.xcoff.DWARF()
+}