2013-12-16 10:52:11 -07:00
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Parsing of ELF executables (Linux, FreeBSD, and so on).
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package main
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import (
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"debug/elf"
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"os"
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)
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func elfSymbols(f *os.File) []Sym {
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p, err := elf.NewFile(f)
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if err != nil {
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errorf("parsing %s: %v", f.Name(), err)
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return nil
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}
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elfSyms, err := p.Symbols()
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if err != nil {
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errorf("parsing %s: %v", f.Name(), err)
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return nil
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}
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var syms []Sym
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for _, s := range elfSyms {
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sym := Sym{Addr: s.Value, Name: s.Name, Size: int64(s.Size), Code: '?'}
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switch s.Section {
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case elf.SHN_UNDEF:
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sym.Code = 'U'
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case elf.SHN_COMMON:
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sym.Code = 'B'
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default:
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i := int(s.Section)
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if i <= 0 || i > len(p.Sections) {
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break
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}
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sect := p.Sections[i-1]
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switch sect.Flags & (elf.SHF_WRITE | elf.SHF_ALLOC | elf.SHF_EXECINSTR) {
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case elf.SHF_ALLOC | elf.SHF_EXECINSTR:
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sym.Code = 'T'
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case elf.SHF_ALLOC:
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sym.Code = 'R'
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case elf.SHF_ALLOC | elf.SHF_WRITE:
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sym.Code = 'D'
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}
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}
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2013-12-18 11:29:40 -07:00
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if elf.ST_BIND(s.Info) == elf.STB_LOCAL {
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sym.Code += 'a' - 'A'
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}
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2013-12-16 10:52:11 -07:00
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syms = append(syms, sym)
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}
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return syms
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}
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