mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-19 09:32:35 +01:00
135 lines
3.0 KiB
Go
135 lines
3.0 KiB
Go
// 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/dwarf"
|
|
"debug/macho"
|
|
"fmt"
|
|
"os"
|
|
"sort"
|
|
)
|
|
|
|
const stabTypeMask = 0xe0
|
|
|
|
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 {
|
|
// Skip stab debug info.
|
|
if s.Type&stabTypeMask == 0 {
|
|
addrs = append(addrs, s.Value)
|
|
}
|
|
}
|
|
sort.Sort(uint64s(addrs))
|
|
|
|
var syms []Sym
|
|
for _, s := range f.macho.Symtab.Syms {
|
|
if s.Type&stabTypeMask != 0 {
|
|
// Skip stab debug info.
|
|
continue
|
|
}
|
|
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 "ppc64"
|
|
}
|
|
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] }
|
|
|
|
func (f *machoFile) loadAddress() (uint64, error) {
|
|
return 0, fmt.Errorf("unknown load address")
|
|
}
|
|
|
|
func (f *machoFile) dwarf() (*dwarf.Data, error) {
|
|
return f.macho.DWARF()
|
|
}
|