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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 PE executables (Microsoft Windows).
package main
import (
"debug/pe"
"os"
"sort"
)
func peSymbols(f *os.File) []Sym {
p, err := pe.NewFile(f)
if err != nil {
errorf("parsing %s: %v", f.Name(), err)
return nil
}
// 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 := p.OptionalHeader.(type) {
case *pe.OptionalHeader32:
imageBase = uint64(oh.ImageBase)
case *pe.OptionalHeader64:
imageBase = oh.ImageBase
default:
errorf("parsing %s: file format not recognized", f.Name())
return nil
}
var syms []Sym
for _, s := range p.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 {
errorf("parsing %s: invalid section number %d", f.Name(), s.SectionNumber)
return nil
}
if len(p.Sections) < int(s.SectionNumber) {
errorf("parsing %s: section number %d is large then max %d", f.Name(), s.SectionNumber, len(p.Sections))
return nil
}
sect := p.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
}
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