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path: root/src/pkg/debug/elf/file.go
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Diffstat (limited to 'src/pkg/debug/elf/file.go')
-rw-r--r--src/pkg/debug/elf/file.go149
1 files changed, 125 insertions, 24 deletions
diff --git a/src/pkg/debug/elf/file.go b/src/pkg/debug/elf/file.go
index 6fdcda6d4..9ae8b413d 100644
--- a/src/pkg/debug/elf/file.go
+++ b/src/pkg/debug/elf/file.go
@@ -35,9 +35,11 @@ type FileHeader struct {
// A File represents an open ELF file.
type File struct {
FileHeader
- Sections []*Section
- Progs []*Prog
- closer io.Closer
+ Sections []*Section
+ Progs []*Prog
+ closer io.Closer
+ gnuNeed []verneed
+ gnuVersym []byte
}
// A SectionHeader represents a single ELF section header.
@@ -329,8 +331,8 @@ func NewFile(r io.ReaderAt) (*File, os.Error) {
}
// getSymbols returns a slice of Symbols from parsing the symbol table
-// with the given type.
-func (f *File) getSymbols(typ SectionType) ([]Symbol, os.Error) {
+// with the given type, along with the associated string table.
+func (f *File) getSymbols(typ SectionType) ([]Symbol, []byte, os.Error) {
switch f.Class {
case ELFCLASS64:
return f.getSymbols64(typ)
@@ -339,27 +341,27 @@ func (f *File) getSymbols(typ SectionType) ([]Symbol, os.Error) {
return f.getSymbols32(typ)
}
- return nil, os.ErrorString("not implemented")
+ return nil, nil, os.ErrorString("not implemented")
}
-func (f *File) getSymbols32(typ SectionType) ([]Symbol, os.Error) {
+func (f *File) getSymbols32(typ SectionType) ([]Symbol, []byte, os.Error) {
symtabSection := f.SectionByType(typ)
if symtabSection == nil {
- return nil, os.ErrorString("no symbol section")
+ return nil, nil, os.ErrorString("no symbol section")
}
data, err := symtabSection.Data()
if err != nil {
- return nil, os.ErrorString("cannot load symbol section")
+ return nil, nil, os.ErrorString("cannot load symbol section")
}
symtab := bytes.NewBuffer(data)
if symtab.Len()%Sym32Size != 0 {
- return nil, os.ErrorString("length of symbol section is not a multiple of SymSize")
+ return nil, nil, os.ErrorString("length of symbol section is not a multiple of SymSize")
}
strdata, err := f.stringTable(symtabSection.Link)
if err != nil {
- return nil, os.ErrorString("cannot load string table section")
+ return nil, nil, os.ErrorString("cannot load string table section")
}
// The first entry is all zeros.
@@ -382,27 +384,27 @@ func (f *File) getSymbols32(typ SectionType) ([]Symbol, os.Error) {
i++
}
- return symbols, nil
+ return symbols, strdata, nil
}
-func (f *File) getSymbols64(typ SectionType) ([]Symbol, os.Error) {
+func (f *File) getSymbols64(typ SectionType) ([]Symbol, []byte, os.Error) {
symtabSection := f.SectionByType(typ)
if symtabSection == nil {
- return nil, os.ErrorString("no symbol section")
+ return nil, nil, os.ErrorString("no symbol section")
}
data, err := symtabSection.Data()
if err != nil {
- return nil, os.ErrorString("cannot load symbol section")
+ return nil, nil, os.ErrorString("cannot load symbol section")
}
symtab := bytes.NewBuffer(data)
if symtab.Len()%Sym64Size != 0 {
- return nil, os.ErrorString("length of symbol section is not a multiple of Sym64Size")
+ return nil, nil, os.ErrorString("length of symbol section is not a multiple of Sym64Size")
}
strdata, err := f.stringTable(symtabSection.Link)
if err != nil {
- return nil, os.ErrorString("cannot load string table section")
+ return nil, nil, os.ErrorString("cannot load string table section")
}
// The first entry is all zeros.
@@ -425,7 +427,7 @@ func (f *File) getSymbols64(typ SectionType) ([]Symbol, os.Error) {
i++
}
- return symbols, nil
+ return symbols, strdata, nil
}
// getString extracts a string from an ELF string table.
@@ -468,7 +470,7 @@ func (f *File) applyRelocationsAMD64(dst []byte, rels []byte) os.Error {
return os.ErrorString("length of relocation section is not a multiple of Sym64Size")
}
- symbols, err := f.getSymbols(SHT_SYMTAB)
+ symbols, _, err := f.getSymbols(SHT_SYMTAB)
if err != nil {
return err
}
@@ -544,24 +546,123 @@ func (f *File) DWARF() (*dwarf.Data, os.Error) {
return dwarf.New(abbrev, nil, nil, info, nil, nil, nil, str)
}
+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() ([]string, os.Error) {
- sym, err := f.getSymbols(SHT_DYNSYM)
+func (f *File) ImportedSymbols() ([]ImportedSymbol, os.Error) {
+ sym, str, err := f.getSymbols(SHT_DYNSYM)
if err != nil {
return nil, err
}
- var all []string
- for _, s := range sym {
+ 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, s.Name)
+ all = append(all, ImportedSymbol{Name: s.Name})
+ f.gnuVersion(i, &all[len(all)-1])
}
}
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) {
+ // Accumulate verneed information.
+ vn := f.SectionByType(SHT_GNU_VERNEED)
+ if vn == nil {
+ return
+ }
+ 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
+ }
+ d, _ = vs.Data()
+
+ f.gnuNeed = need
+ f.gnuVersym = d
+}
+
+// gnuVersion adds Library and Version information to sym,
+// which came from offset i of the symbol table.
+func (f *File) gnuVersion(i int, sym *ImportedSymbol) {
+ // Each entry is two bytes; skip undef entry at beginning.
+ i = (i + 1) * 2
+ if i >= len(f.gnuVersym) {
+ return
+ }
+ j := int(f.ByteOrder.Uint16(f.gnuVersym[i:]))
+ if j < 2 || j >= len(f.gnuNeed) {
+ return
+ }
+ n := &f.gnuNeed[j]
+ sym.Library = n.File
+ sym.Version = 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.
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-06 21:20:32 +0000