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// Copyright 2016 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package symbolizer
import (
"bufio"
"bytes"
"strconv"
"github.com/google/syzkaller/pkg/osutil"
)
type Symbol struct {
Addr uint64
Size int
}
// ReadSymbols returns list of text symbols in the binary bin.
func ReadSymbols(bin string) (map[string][]Symbol, error) {
cmd := osutil.Command("nm", "-nS", bin)
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
defer stdout.Close()
if err := cmd.Start(); err != nil {
return nil, err
}
defer cmd.Wait()
symbols := make(map[string][]Symbol)
s := bufio.NewScanner(stdout)
text := [][]byte{[]byte(" t "), []byte(" T ")}
for s.Scan() {
// A line looks as: "ffffffff8104db90 0000000000000059 t snb_uncore_msr_enable_box"
ln := s.Bytes()
if bytes.Index(ln, text[0]) == -1 && bytes.Index(ln, text[1]) == -1 {
continue
}
sp1 := bytes.IndexByte(ln, ' ')
if sp1 == -1 {
continue
}
sp2 := bytes.IndexByte(ln[sp1+1:], ' ')
if sp2 == -1 {
continue
}
sp2 += sp1 + 1
if !bytes.HasPrefix(ln[sp2:], text[0]) && !bytes.HasPrefix(ln[sp2:], text[1]) {
continue
}
addr, err := strconv.ParseUint(string(ln[:sp1]), 16, 64)
if err != nil {
continue
}
size, err := strconv.ParseUint(string(ln[sp1+1:sp2]), 16, 64)
if err != nil {
continue
}
name := string(ln[sp2+len(text[0]):])
// Note: sizes reported by kernel do not match nm.
// Kernel probably subtracts address of this symbol from address of the next symbol.
// We could do the same, but for now we just round up size to 16.
symbols[name] = append(symbols[name], Symbol{addr, int(size+15) / 16 * 16})
}
if err := s.Err(); err != nil {
return nil, err
}
return symbols, nil
}
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