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// 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 main
import (
"debug/elf"
"os"
)
func elfSymbols(f *os.File) (syms []Sym, goarch string) {
p, err := elf.NewFile(f)
if err != nil {
errorf("parsing %s: %v", f.Name(), err)
return
}
elfSyms, err := p.Symbols()
if err != nil {
errorf("parsing %s: %v", f.Name(), err)
return
}
switch p.Machine {
case elf.EM_X86_64:
goarch = "amd64"
case elf.EM_386:
goarch = "386"
case elf.EM_ARM:
goarch = "arm"
}
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(p.Sections) {
break
}
sect := p.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
}
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