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-rw-r--r--src/cmd/internal/objfile/disasm.go248
-rw-r--r--src/cmd/internal/objfile/elf.go104
-rw-r--r--src/cmd/internal/objfile/goobj.go93
-rw-r--r--src/cmd/internal/objfile/macho.go116
-rw-r--r--src/cmd/internal/objfile/objfile.go94
-rw-r--r--src/cmd/internal/objfile/pe.go201
-rw-r--r--src/cmd/internal/objfile/plan9obj.go146
7 files changed, 1002 insertions, 0 deletions
diff --git a/src/cmd/internal/objfile/disasm.go b/src/cmd/internal/objfile/disasm.go
new file mode 100644
index 000000000..1a339c321
--- /dev/null
+++ b/src/cmd/internal/objfile/disasm.go
@@ -0,0 +1,248 @@
+// 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 objfile
+
+import (
+ "bufio"
+ "debug/gosym"
+ "encoding/binary"
+ "fmt"
+ "io"
+ "regexp"
+ "sort"
+ "strings"
+ "text/tabwriter"
+
+ "cmd/internal/rsc.io/arm/armasm"
+ "cmd/internal/rsc.io/x86/x86asm"
+)
+
+// Disasm is a disassembler for a given File.
+type Disasm struct {
+ syms []Sym //symbols in file, sorted by address
+ pcln *gosym.Table // pcln table
+ text []byte // bytes of text segment (actual instructions)
+ textStart uint64 // start PC of text
+ textEnd uint64 // end PC of text
+ goarch string // GOARCH string
+ disasm disasmFunc // disassembler function for goarch
+ byteOrder binary.ByteOrder // byte order for goarch
+}
+
+// Disasm returns a disassembler for the file f.
+func (f *File) Disasm() (*Disasm, error) {
+ syms, err := f.Symbols()
+ if err != nil {
+ return nil, err
+ }
+
+ pcln, err := f.PCLineTable()
+ if err != nil {
+ return nil, err
+ }
+
+ textStart, textBytes, err := f.Text()
+ if err != nil {
+ return nil, err
+ }
+
+ goarch := f.GOARCH()
+ disasm := disasms[goarch]
+ byteOrder := byteOrders[goarch]
+ if disasm == nil || byteOrder == nil {
+ return nil, fmt.Errorf("unsupported architecture")
+ }
+
+ // Filter out section symbols, overwriting syms in place.
+ keep := syms[:0]
+ for _, sym := range syms {
+ switch sym.Name {
+ case "runtime.text", "text", "_text", "runtime.etext", "etext", "_etext":
+ // drop
+ default:
+ keep = append(keep, sym)
+ }
+ }
+ syms = keep
+ d := &Disasm{
+ syms: syms,
+ pcln: pcln,
+ text: textBytes,
+ textStart: textStart,
+ textEnd: textStart + uint64(len(textBytes)),
+ goarch: goarch,
+ disasm: disasm,
+ byteOrder: byteOrder,
+ }
+
+ return d, nil
+}
+
+// lookup finds the symbol name containing addr.
+func (d *Disasm) lookup(addr uint64) (name string, base uint64) {
+ i := sort.Search(len(d.syms), func(i int) bool { return addr < d.syms[i].Addr })
+ if i > 0 {
+ s := d.syms[i-1]
+ if s.Addr != 0 && s.Addr <= addr && addr < s.Addr+uint64(s.Size) {
+ return s.Name, s.Addr
+ }
+ }
+ return "", 0
+}
+
+// base returns the final element in the path.
+// It works on both Windows and Unix paths,
+// regardless of host operating system.
+func base(path string) string {
+ path = path[strings.LastIndex(path, "/")+1:]
+ path = path[strings.LastIndex(path, `\`)+1:]
+ return path
+}
+
+// Print prints a disassembly of the file to w.
+// If filter is non-nil, the disassembly only includes functions with names matching filter.
+// The disassembly only includes functions that overlap the range [start, end).
+func (d *Disasm) Print(w io.Writer, filter *regexp.Regexp, start, end uint64) {
+ if start < d.textStart {
+ start = d.textStart
+ }
+ if end > d.textEnd {
+ end = d.textEnd
+ }
+ printed := false
+ bw := bufio.NewWriter(w)
+ for _, sym := range d.syms {
+ symStart := sym.Addr
+ symEnd := sym.Addr + uint64(sym.Size)
+ if sym.Code != 'T' && sym.Code != 't' ||
+ symStart < d.textStart ||
+ symEnd <= start || end <= symStart ||
+ filter != nil && !filter.MatchString(sym.Name) {
+ continue
+ }
+ if printed {
+ fmt.Fprintf(bw, "\n")
+ }
+ printed = true
+
+ file, _, _ := d.pcln.PCToLine(sym.Addr)
+ fmt.Fprintf(bw, "TEXT %s(SB) %s\n", sym.Name, file)
+
+ tw := tabwriter.NewWriter(bw, 1, 8, 1, '\t', 0)
+ if symEnd > end {
+ symEnd = end
+ }
+ code := d.text[:end-d.textStart]
+ d.Decode(symStart, symEnd, func(pc, size uint64, file string, line int, text string) {
+ i := pc - d.textStart
+ fmt.Fprintf(tw, "\t%s:%d\t%#x\t", base(file), line, pc)
+ if size%4 != 0 || d.goarch == "386" || d.goarch == "amd64" {
+ // Print instruction as bytes.
+ fmt.Fprintf(tw, "%x", code[i:i+size])
+ } else {
+ // Print instruction as 32-bit words.
+ for j := uint64(0); j < size; j += 4 {
+ if j > 0 {
+ fmt.Fprintf(tw, " ")
+ }
+ fmt.Fprintf(tw, "%08x", d.byteOrder.Uint32(code[i+j:]))
+ }
+ }
+ fmt.Fprintf(tw, "\t%s\n", text)
+ })
+ tw.Flush()
+ }
+ bw.Flush()
+}
+
+// Decode disassembles the text segment range [start, end), calling f for each instruction.
+func (d *Disasm) Decode(start, end uint64, f func(pc, size uint64, file string, line int, text string)) {
+ if start < d.textStart {
+ start = d.textStart
+ }
+ if end > d.textEnd {
+ end = d.textEnd
+ }
+ code := d.text[:end-d.textStart]
+ lookup := d.lookup
+ for pc := start; pc < end; {
+ i := pc - d.textStart
+ text, size := d.disasm(code[i:], pc, lookup)
+ file, line, _ := d.pcln.PCToLine(pc)
+ f(pc, uint64(size), file, line, text)
+ pc += uint64(size)
+ }
+}
+
+type lookupFunc func(addr uint64) (sym string, base uint64)
+type disasmFunc func(code []byte, pc uint64, lookup lookupFunc) (text string, size int)
+
+func disasm_386(code []byte, pc uint64, lookup lookupFunc) (string, int) {
+ return disasm_x86(code, pc, lookup, 32)
+}
+
+func disasm_amd64(code []byte, pc uint64, lookup lookupFunc) (string, int) {
+ return disasm_x86(code, pc, lookup, 64)
+}
+
+func disasm_x86(code []byte, pc uint64, lookup lookupFunc, arch int) (string, int) {
+ inst, err := x86asm.Decode(code, 64)
+ var text string
+ size := inst.Len
+ if err != nil || size == 0 || inst.Op == 0 {
+ size = 1
+ text = "?"
+ } else {
+ text = x86asm.Plan9Syntax(inst, pc, lookup)
+ }
+ return text, size
+}
+
+type textReader struct {
+ code []byte
+ pc uint64
+}
+
+func (r textReader) ReadAt(data []byte, off int64) (n int, err error) {
+ if off < 0 || uint64(off) < r.pc {
+ return 0, io.EOF
+ }
+ d := uint64(off) - r.pc
+ if d >= uint64(len(r.code)) {
+ return 0, io.EOF
+ }
+ n = copy(data, r.code[d:])
+ if n < len(data) {
+ err = io.ErrUnexpectedEOF
+ }
+ return
+}
+
+func disasm_arm(code []byte, pc uint64, lookup lookupFunc) (string, int) {
+ inst, err := armasm.Decode(code, armasm.ModeARM)
+ var text string
+ size := inst.Len
+ if err != nil || size == 0 || inst.Op == 0 {
+ size = 4
+ text = "?"
+ } else {
+ text = armasm.Plan9Syntax(inst, pc, lookup, textReader{code, pc})
+ }
+ return text, size
+}
+
+var disasms = map[string]disasmFunc{
+ "386": disasm_386,
+ "amd64": disasm_amd64,
+ "arm": disasm_arm,
+}
+
+var byteOrders = map[string]binary.ByteOrder{
+ "386": binary.LittleEndian,
+ "amd64": binary.LittleEndian,
+ "arm": binary.LittleEndian,
+ "power64": binary.BigEndian,
+ "power64le": binary.LittleEndian,
+}
diff --git a/src/cmd/internal/objfile/elf.go b/src/cmd/internal/objfile/elf.go
new file mode 100644
index 000000000..17755b84d
--- /dev/null
+++ b/src/cmd/internal/objfile/elf.go
@@ -0,0 +1,104 @@
+// Copyright 2013 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 ELF executables (Linux, FreeBSD, and so on).
+
+package objfile
+
+import (
+ "debug/elf"
+ "fmt"
+ "os"
+)
+
+type elfFile struct {
+ elf *elf.File
+}
+
+func openElf(r *os.File) (rawFile, error) {
+ f, err := elf.NewFile(r)
+ if err != nil {
+ return nil, err
+ }
+ return &elfFile{f}, nil
+}
+
+func (f *elfFile) symbols() ([]Sym, error) {
+ elfSyms, err := f.elf.Symbols()
+ if err != nil {
+ return nil, err
+ }
+
+ var syms []Sym
+ for _, s := range elfSyms {
+ sym := Sym{Addr: s.Value, Name: s.Name, Size: int64(s.Size), Code: '?'}
+ switch s.Section {
+ case elf.SHN_UNDEF:
+ sym.Code = 'U'
+ case elf.SHN_COMMON:
+ sym.Code = 'B'
+ default:
+ i := int(s.Section)
+ if i < 0 || i >= len(f.elf.Sections) {
+ break
+ }
+ sect := f.elf.Sections[i]
+ switch sect.Flags & (elf.SHF_WRITE | elf.SHF_ALLOC | elf.SHF_EXECINSTR) {
+ case elf.SHF_ALLOC | elf.SHF_EXECINSTR:
+ sym.Code = 'T'
+ case elf.SHF_ALLOC:
+ sym.Code = 'R'
+ case elf.SHF_ALLOC | elf.SHF_WRITE:
+ sym.Code = 'D'
+ }
+ }
+ if elf.ST_BIND(s.Info) == elf.STB_LOCAL {
+ sym.Code += 'a' - 'A'
+ }
+ syms = append(syms, sym)
+ }
+
+ return syms, nil
+}
+
+func (f *elfFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
+ if sect := f.elf.Section(".text"); sect != nil {
+ textStart = sect.Addr
+ }
+ if sect := f.elf.Section(".gosymtab"); sect != nil {
+ if symtab, err = sect.Data(); err != nil {
+ return 0, nil, nil, err
+ }
+ }
+ if sect := f.elf.Section(".gopclntab"); sect != nil {
+ if pclntab, err = sect.Data(); err != nil {
+ return 0, nil, nil, err
+ }
+ }
+ return textStart, symtab, pclntab, nil
+}
+
+func (f *elfFile) text() (textStart uint64, text []byte, err error) {
+ sect := f.elf.Section(".text")
+ if sect == nil {
+ return 0, nil, fmt.Errorf("text section not found")
+ }
+ textStart = sect.Addr
+ text, err = sect.Data()
+ return
+}
+
+func (f *elfFile) goarch() string {
+ switch f.elf.Machine {
+ case elf.EM_386:
+ return "386"
+ case elf.EM_X86_64:
+ return "amd64"
+ case elf.EM_ARM:
+ return "arm"
+ case elf.EM_PPC64:
+ return "power64"
+ }
+ return ""
+}
diff --git a/src/cmd/internal/objfile/goobj.go b/src/cmd/internal/objfile/goobj.go
new file mode 100644
index 000000000..6b1607a17
--- /dev/null
+++ b/src/cmd/internal/objfile/goobj.go
@@ -0,0 +1,93 @@
+// Copyright 2013 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 Go intermediate object files and archives.
+
+package objfile
+
+import (
+ "cmd/internal/goobj"
+ "fmt"
+ "os"
+)
+
+type goobjFile struct {
+ goobj *goobj.Package
+}
+
+func openGoobj(r *os.File) (rawFile, error) {
+ f, err := goobj.Parse(r, `""`)
+ if err != nil {
+ return nil, err
+ }
+ return &goobjFile{f}, nil
+}
+
+func goobjName(id goobj.SymID) string {
+ if id.Version == 0 {
+ return id.Name
+ }
+ return fmt.Sprintf("%s<%d>", id.Name, id.Version)
+}
+
+func (f *goobjFile) symbols() ([]Sym, error) {
+ seen := make(map[goobj.SymID]bool)
+
+ var syms []Sym
+ for _, s := range f.goobj.Syms {
+ seen[s.SymID] = true
+ sym := Sym{Addr: uint64(s.Data.Offset), Name: goobjName(s.SymID), Size: int64(s.Size), Type: s.Type.Name, Code: '?'}
+ switch s.Kind {
+ case goobj.STEXT, goobj.SELFRXSECT:
+ sym.Code = 'T'
+ case goobj.STYPE, goobj.SSTRING, goobj.SGOSTRING, goobj.SGOFUNC, goobj.SRODATA, goobj.SFUNCTAB, goobj.STYPELINK, goobj.SSYMTAB, goobj.SPCLNTAB, goobj.SELFROSECT:
+ sym.Code = 'R'
+ case goobj.SMACHOPLT, goobj.SELFSECT, goobj.SMACHO, goobj.SMACHOGOT, goobj.SNOPTRDATA, goobj.SINITARR, goobj.SDATA, goobj.SWINDOWS:
+ sym.Code = 'D'
+ case goobj.SBSS, goobj.SNOPTRBSS, goobj.STLSBSS:
+ sym.Code = 'B'
+ case goobj.SXREF, goobj.SMACHOSYMSTR, goobj.SMACHOSYMTAB, goobj.SMACHOINDIRECTPLT, goobj.SMACHOINDIRECTGOT, goobj.SFILE, goobj.SFILEPATH, goobj.SCONST, goobj.SDYNIMPORT, goobj.SHOSTOBJ:
+ sym.Code = 'X' // should not see
+ }
+ if s.Version != 0 {
+ sym.Code += 'a' - 'A'
+ }
+ syms = append(syms, sym)
+ }
+
+ for _, s := range f.goobj.Syms {
+ for _, r := range s.Reloc {
+ if !seen[r.Sym] {
+ seen[r.Sym] = true
+ sym := Sym{Name: goobjName(r.Sym), Code: 'U'}
+ if s.Version != 0 {
+ // should not happen but handle anyway
+ sym.Code = 'u'
+ }
+ syms = append(syms, sym)
+ }
+ }
+ }
+
+ return syms, nil
+}
+
+// pcln does not make sense for Go object files, because each
+// symbol has its own individual pcln table, so there is no global
+// space of addresses to map.
+func (f *goobjFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
+ return 0, nil, nil, fmt.Errorf("pcln not available in go object file")
+}
+
+// text does not make sense for Go object files, because
+// each function has a separate section.
+func (f *goobjFile) text() (textStart uint64, text []byte, err error) {
+ return 0, nil, fmt.Errorf("text not available in go object file")
+}
+
+// goarch makes sense but is not exposed in debug/goobj's API,
+// and we don't need it yet for any users of internal/objfile.
+func (f *goobjFile) goarch() string {
+ return "GOARCH unimplemented for debug/goobj files"
+}
diff --git a/src/cmd/internal/objfile/macho.go b/src/cmd/internal/objfile/macho.go
new file mode 100644
index 000000000..7dd84a339
--- /dev/null
+++ b/src/cmd/internal/objfile/macho.go
@@ -0,0 +1,116 @@
+// Copyright 2013 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 Mach-O executables (OS X).
+
+package objfile
+
+import (
+ "debug/macho"
+ "fmt"
+ "os"
+ "sort"
+)
+
+type machoFile struct {
+ macho *macho.File
+}
+
+func openMacho(r *os.File) (rawFile, error) {
+ f, err := macho.NewFile(r)
+ if err != nil {
+ return nil, err
+ }
+ return &machoFile{f}, nil
+}
+
+func (f *machoFile) symbols() ([]Sym, error) {
+ if f.macho.Symtab == nil {
+ return nil, fmt.Errorf("missing symbol table")
+ }
+
+ // Build sorted list of addresses of all symbols.
+ // We infer the size of a symbol by looking at where the next symbol begins.
+ var addrs []uint64
+ for _, s := range f.macho.Symtab.Syms {
+ addrs = append(addrs, s.Value)
+ }
+ sort.Sort(uint64s(addrs))
+
+ var syms []Sym
+ for _, s := range f.macho.Symtab.Syms {
+ sym := Sym{Name: s.Name, Addr: s.Value, Code: '?'}
+ i := sort.Search(len(addrs), func(x int) bool { return addrs[x] > s.Value })
+ if i < len(addrs) {
+ sym.Size = int64(addrs[i] - s.Value)
+ }
+ if s.Sect == 0 {
+ sym.Code = 'U'
+ } else if int(s.Sect) <= len(f.macho.Sections) {
+ sect := f.macho.Sections[s.Sect-1]
+ switch sect.Seg {
+ case "__TEXT":
+ sym.Code = 'R'
+ case "__DATA":
+ sym.Code = 'D'
+ }
+ switch sect.Seg + " " + sect.Name {
+ case "__TEXT __text":
+ sym.Code = 'T'
+ case "__DATA __bss", "__DATA __noptrbss":
+ sym.Code = 'B'
+ }
+ }
+ syms = append(syms, sym)
+ }
+
+ return syms, nil
+}
+
+func (f *machoFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
+ if sect := f.macho.Section("__text"); sect != nil {
+ textStart = sect.Addr
+ }
+ if sect := f.macho.Section("__gosymtab"); sect != nil {
+ if symtab, err = sect.Data(); err != nil {
+ return 0, nil, nil, err
+ }
+ }
+ if sect := f.macho.Section("__gopclntab"); sect != nil {
+ if pclntab, err = sect.Data(); err != nil {
+ return 0, nil, nil, err
+ }
+ }
+ return textStart, symtab, pclntab, nil
+}
+
+func (f *machoFile) text() (textStart uint64, text []byte, err error) {
+ sect := f.macho.Section("__text")
+ if sect == nil {
+ return 0, nil, fmt.Errorf("text section not found")
+ }
+ textStart = sect.Addr
+ text, err = sect.Data()
+ return
+}
+
+func (f *machoFile) goarch() string {
+ switch f.macho.Cpu {
+ case macho.Cpu386:
+ return "386"
+ case macho.CpuAmd64:
+ return "amd64"
+ case macho.CpuArm:
+ return "arm"
+ case macho.CpuPpc64:
+ return "power64"
+ }
+ return ""
+}
+
+type uint64s []uint64
+
+func (x uint64s) Len() int { return len(x) }
+func (x uint64s) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+func (x uint64s) Less(i, j int) bool { return x[i] < x[j] }
diff --git a/src/cmd/internal/objfile/objfile.go b/src/cmd/internal/objfile/objfile.go
new file mode 100644
index 000000000..9227ef387
--- /dev/null
+++ b/src/cmd/internal/objfile/objfile.go
@@ -0,0 +1,94 @@
+// 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 objfile implements portable access to OS-specific executable files.
+package objfile
+
+import (
+ "debug/gosym"
+ "fmt"
+ "os"
+ "sort"
+)
+
+type rawFile interface {
+ symbols() (syms []Sym, err error)
+ pcln() (textStart uint64, symtab, pclntab []byte, err error)
+ text() (textStart uint64, text []byte, err error)
+ goarch() string
+}
+
+// A File is an opened executable file.
+type File struct {
+ r *os.File
+ raw rawFile
+}
+
+// A Sym is a symbol defined in an executable file.
+type Sym struct {
+ Name string // symbol name
+ Addr uint64 // virtual address of symbol
+ Size int64 // size in bytes
+ Code rune // nm code (T for text, D for data, and so on)
+ Type string // XXX?
+}
+
+var openers = []func(*os.File) (rawFile, error){
+ openElf,
+ openGoobj,
+ openMacho,
+ openPE,
+ openPlan9,
+}
+
+// Open opens the named file.
+// The caller must call f.Close when the file is no longer needed.
+func Open(name string) (*File, error) {
+ r, err := os.Open(name)
+ if err != nil {
+ return nil, err
+ }
+ for _, try := range openers {
+ if raw, err := try(r); err == nil {
+ return &File{r, raw}, nil
+ }
+ }
+ r.Close()
+ return nil, fmt.Errorf("open %s: unrecognized object file", name)
+}
+
+func (f *File) Close() error {
+ return f.r.Close()
+}
+
+func (f *File) Symbols() ([]Sym, error) {
+ syms, err := f.raw.symbols()
+ if err != nil {
+ return nil, err
+ }
+ sort.Sort(byAddr(syms))
+ return syms, nil
+}
+
+type byAddr []Sym
+
+func (x byAddr) Less(i, j int) bool { return x[i].Addr < x[j].Addr }
+func (x byAddr) Len() int { return len(x) }
+func (x byAddr) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+
+func (f *File) PCLineTable() (*gosym.Table, error) {
+ textStart, symtab, pclntab, err := f.raw.pcln()
+ if err != nil {
+ return nil, err
+ }
+ return gosym.NewTable(symtab, gosym.NewLineTable(pclntab, textStart))
+}
+
+func (f *File) Text() (uint64, []byte, error) {
+ return f.raw.text()
+}
+
+func (f *File) GOARCH() string {
+ return f.raw.goarch()
+}
diff --git a/src/cmd/internal/objfile/pe.go b/src/cmd/internal/objfile/pe.go
new file mode 100644
index 000000000..67e59c226
--- /dev/null
+++ b/src/cmd/internal/objfile/pe.go
@@ -0,0 +1,201 @@
+// Copyright 2013 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 PE executables (Microsoft Windows).
+
+package objfile
+
+import (
+ "debug/pe"
+ "fmt"
+ "os"
+ "sort"
+)
+
+type peFile struct {
+ pe *pe.File
+}
+
+func openPE(r *os.File) (rawFile, error) {
+ f, err := pe.NewFile(r)
+ if err != nil {
+ return nil, err
+ }
+ switch f.OptionalHeader.(type) {
+ case *pe.OptionalHeader32, *pe.OptionalHeader64:
+ // ok
+ default:
+ return nil, fmt.Errorf("unrecognized PE format")
+ }
+ return &peFile{f}, nil
+}
+
+func (f *peFile) symbols() ([]Sym, error) {
+ // Build sorted list of addresses of all symbols.
+ // We infer the size of a symbol by looking at where the next symbol begins.
+ var addrs []uint64
+
+ var imageBase uint64
+ switch oh := f.pe.OptionalHeader.(type) {
+ case *pe.OptionalHeader32:
+ imageBase = uint64(oh.ImageBase)
+ case *pe.OptionalHeader64:
+ imageBase = oh.ImageBase
+ }
+
+ var syms []Sym
+ for _, s := range f.pe.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: uint64(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.pe.Sections) < int(s.SectionNumber) {
+ return nil, fmt.Errorf("invalid section number in symbol table")
+ }
+ sect := f.pe.Sections[s.SectionNumber-1]
+ const (
+ text = 0x20
+ data = 0x40
+ bss = 0x80
+ permX = 0x20000000
+ permR = 0x40000000
+ permW = 0x80000000
+ )
+ ch := sect.Characteristics
+ switch {
+ case ch&text != 0:
+ sym.Code = 'T'
+ case ch&data != 0:
+ if ch&permW == 0 {
+ sym.Code = 'R'
+ } else {
+ sym.Code = 'D'
+ }
+ case ch&bss != 0:
+ sym.Code = 'B'
+ }
+ sym.Addr += imageBase + uint64(sect.VirtualAddress)
+ }
+ syms = append(syms, sym)
+ addrs = append(addrs, sym.Addr)
+ }
+
+ sort.Sort(uint64s(addrs))
+ for i := range syms {
+ j := sort.Search(len(addrs), func(x int) bool { return addrs[x] > syms[i].Addr })
+ if j < len(addrs) {
+ syms[i].Size = int64(addrs[j] - syms[i].Addr)
+ }
+ }
+
+ return syms, nil
+}
+
+func (f *peFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
+ var imageBase uint64
+ switch oh := f.pe.OptionalHeader.(type) {
+ case *pe.OptionalHeader32:
+ imageBase = uint64(oh.ImageBase)
+ case *pe.OptionalHeader64:
+ imageBase = oh.ImageBase
+ default:
+ return 0, nil, nil, fmt.Errorf("pe file format not recognized")
+ }
+ if sect := f.pe.Section(".text"); sect != nil {
+ textStart = imageBase + uint64(sect.VirtualAddress)
+ }
+ if pclntab, err = loadPETable(f.pe, "runtime.pclntab", "runtime.epclntab"); err != nil {
+ // We didn't find the symbols, so look for the names used in 1.3 and earlier.
+ // TODO: Remove code looking for the old symbols when we no longer care about 1.3.
+ var err2 error
+ if pclntab, err2 = loadPETable(f.pe, "pclntab", "epclntab"); err2 != nil {
+ return 0, nil, nil, err
+ }
+ }
+ if symtab, err = loadPETable(f.pe, "runtime.symtab", "runtime.esymtab"); err != nil {
+ // Same as above.
+ var err2 error
+ if symtab, err2 = loadPETable(f.pe, "symtab", "esymtab"); err2 != nil {
+ return 0, nil, nil, err
+ }
+ }
+ return textStart, symtab, pclntab, nil
+}
+
+func (f *peFile) text() (textStart uint64, text []byte, err error) {
+ var imageBase uint64
+ switch oh := f.pe.OptionalHeader.(type) {
+ case *pe.OptionalHeader32:
+ imageBase = uint64(oh.ImageBase)
+ case *pe.OptionalHeader64:
+ imageBase = oh.ImageBase
+ default:
+ return 0, nil, fmt.Errorf("pe file format not recognized")
+ }
+ sect := f.pe.Section(".text")
+ if sect == nil {
+ return 0, nil, fmt.Errorf("text section not found")
+ }
+ textStart = imageBase + uint64(sect.VirtualAddress)
+ text, err = sect.Data()
+ return
+}
+
+func findPESymbol(f *pe.File, name string) (*pe.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 loadPETable(f *pe.File, sname, ename string) ([]byte, error) {
+ ssym, err := findPESymbol(f, sname)
+ if err != nil {
+ return nil, err
+ }
+ esym, err := findPESymbol(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 *peFile) goarch() string {
+ // Not sure how to get the info we want from PE header.
+ // Look in symbol table for telltale rt0 symbol.
+ if _, err := findPESymbol(f.pe, "_rt0_386_windows"); err == nil {
+ return "386"
+ }
+ if _, err := findPESymbol(f.pe, "_rt0_amd64_windows"); err == nil {
+ return "amd64"
+ }
+ return ""
+}
diff --git a/src/cmd/internal/objfile/plan9obj.go b/src/cmd/internal/objfile/plan9obj.go
new file mode 100644
index 000000000..eb6cba5eb
--- /dev/null
+++ b/src/cmd/internal/objfile/plan9obj.go
@@ -0,0 +1,146 @@
+// 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.
+
+// Parsing of Plan 9 a.out executables.
+
+package objfile
+
+import (
+ "debug/plan9obj"
+ "fmt"
+ "os"
+ "sort"
+)
+
+var validSymType = map[rune]bool{
+ 'T': true,
+ 't': true,
+ 'D': true,
+ 'd': true,
+ 'B': true,
+ 'b': true,
+}
+
+type plan9File struct {
+ plan9 *plan9obj.File
+}
+
+func openPlan9(r *os.File) (rawFile, error) {
+ f, err := plan9obj.NewFile(r)
+ if err != nil {
+ return nil, err
+ }
+ return &plan9File{f}, nil
+}
+
+func (f *plan9File) symbols() ([]Sym, error) {
+ plan9Syms, err := f.plan9.Symbols()
+ if err != nil {
+ return nil, err
+ }
+
+ // Build sorted list of addresses of all symbols.
+ // We infer the size of a symbol by looking at where the next symbol begins.
+ var addrs []uint64
+ for _, s := range plan9Syms {
+ if !validSymType[s.Type] {
+ continue
+ }
+ addrs = append(addrs, s.Value)
+ }
+ sort.Sort(uint64s(addrs))
+
+ var syms []Sym
+
+ for _, s := range plan9Syms {
+ if !validSymType[s.Type] {
+ continue
+ }
+ sym := Sym{Addr: s.Value, Name: s.Name, Code: rune(s.Type)}
+ i := sort.Search(len(addrs), func(x int) bool { return addrs[x] > s.Value })
+ if i < len(addrs) {
+ sym.Size = int64(addrs[i] - s.Value)
+ }
+ syms = append(syms, sym)
+ }
+
+ return syms, nil
+}
+
+func (f *plan9File) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
+ textStart = f.plan9.LoadAddress + f.plan9.HdrSize
+ if pclntab, err = loadPlan9Table(f.plan9, "runtime.pclntab", "runtime.epclntab"); err != nil {
+ // We didn't find the symbols, so look for the names used in 1.3 and earlier.
+ // TODO: Remove code looking for the old symbols when we no longer care about 1.3.
+ var err2 error
+ if pclntab, err2 = loadPlan9Table(f.plan9, "pclntab", "epclntab"); err2 != nil {
+ return 0, nil, nil, err
+ }
+ }
+ if symtab, err = loadPlan9Table(f.plan9, "runtime.symtab", "runtime.esymtab"); err != nil {
+ // Same as above.
+ var err2 error
+ if symtab, err2 = loadPlan9Table(f.plan9, "symtab", "esymtab"); err2 != nil {
+ return 0, nil, nil, err
+ }
+ }
+ return textStart, symtab, pclntab, nil
+}
+
+func (f *plan9File) text() (textStart uint64, text []byte, err error) {
+ sect := f.plan9.Section("text")
+ if sect == nil {
+ return 0, nil, fmt.Errorf("text section not found")
+ }
+ textStart = f.plan9.LoadAddress + f.plan9.HdrSize
+ text, err = sect.Data()
+ return
+}
+
+func findPlan9Symbol(f *plan9obj.File, name string) (*plan9obj.Sym, error) {
+ syms, err := f.Symbols()
+ if err != nil {
+ return nil, err
+ }
+ for _, s := range syms {
+ if s.Name != name {
+ continue
+ }
+ return &s, nil
+ }
+ return nil, fmt.Errorf("no %s symbol found", name)
+}
+
+func loadPlan9Table(f *plan9obj.File, sname, ename string) ([]byte, error) {
+ ssym, err := findPlan9Symbol(f, sname)
+ if err != nil {
+ return nil, err
+ }
+ esym, err := findPlan9Symbol(f, ename)
+ if err != nil {
+ return nil, err
+ }
+ sect := f.Section("text")
+ if sect == nil {
+ return nil, err
+ }
+ data, err := sect.Data()
+ if err != nil {
+ return nil, err
+ }
+ textStart := f.LoadAddress + f.HdrSize
+ return data[ssym.Value-textStart : esym.Value-textStart], nil
+}
+
+func (f *plan9File) goarch() string {
+ switch f.plan9.Magic {
+ case plan9obj.Magic386:
+ return "386"
+ case plan9obj.MagicAMD64:
+ return "amd64"
+ case plan9obj.MagicARM:
+ return "arm"
+ }
+ return ""
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-07 18:57:02 +0000