blob: d4f8fc8808d9cf2d9368817cf9f6b66ded175ed4 [file] [log] [blame]
// Copyright 2014 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.
// Copied and simplified from rsc.io/arm/armasm/objdumpext_test.go.
package ppc64asm
import (
"bytes"
"debug/elf"
"encoding/binary"
"fmt"
"io"
"log"
"os"
"runtime"
"strconv"
"strings"
"testing"
)
const objdumpPath = "/usr/bin/objdump"
func testObjdump(t *testing.T, generate func(func([]byte))) {
if testing.Short() {
t.Skip("skipping objdump test in short mode")
}
if runtime.GOARCH != "ppc64le" && runtime.GOARCH != "ppc64" {
t.Skip("skipping; test requires host tool objdump for ppc64 or ppc64le")
}
if _, err := os.Stat(objdumpPath); err != nil {
t.Skip(err)
}
testExtDis(t, "gnu", objdump, generate, allowedMismatchObjdump)
}
func objdump(ext *ExtDis) error {
// File already written with instructions; add ELF header.
if err := writeELF64(ext.File, ext.Size); err != nil {
return err
}
b, err := ext.Run(objdumpPath, "-d", "-z", ext.File.Name())
if err != nil {
return err
}
var (
nmatch int
reading bool
next uint32 = start
addr uint32
encbuf [4]byte
enc []byte
text string
)
flush := func() {
if addr == next {
if m := pcrel.FindStringSubmatch(text); m != nil {
targ, _ := strconv.ParseUint(m[2], 16, 64)
text = fmt.Sprintf("%s.%+#x", m[1], int32(uint32(targ)-addr))
}
if strings.HasPrefix(text, "stmia") {
text = "stm" + text[5:]
}
if strings.HasPrefix(text, "stmfd") {
text = "stmdb" + text[5:]
}
if strings.HasPrefix(text, "ldmfd") {
text = "ldm" + text[5:]
}
text = strings.Replace(text, "#0.0", "#0", -1)
if text == "undefined" && len(enc) == 4 {
text = "error: unknown instruction"
enc = nil
}
if len(enc) == 4 {
// prints as word but we want to record bytes
enc[0], enc[3] = enc[3], enc[0]
enc[1], enc[2] = enc[2], enc[1]
}
ext.Dec <- ExtInst{addr, encbuf, len(enc), text}
encbuf = [4]byte{}
enc = nil
next += 4
}
}
var textangle = []byte("<.text>:")
for {
line, err := b.ReadSlice('\n')
if err != nil {
if err == io.EOF {
break
}
return fmt.Errorf("reading objdump output: %v", err)
}
if bytes.Contains(line, textangle) {
reading = true
continue
}
if !reading {
continue
}
if debug {
os.Stdout.Write(line)
}
if enc1 := parseContinuation(line, encbuf[:len(enc)]); enc1 != nil {
enc = enc1
continue
}
flush()
nmatch++
addr, enc, text = parseLine(line, encbuf[:0])
if addr > next {
return fmt.Errorf("address out of sync expected <= %#x at %q in:\n%s", next, line, line)
}
}
flush()
if next != start+uint32(ext.Size) {
return fmt.Errorf("not enough results found [%d %d]", next, start+ext.Size)
}
if err := ext.Wait(); err != nil {
return fmt.Errorf("exec: %v", err)
}
return nil
}
var (
undefined = []byte("<UNDEFINED>")
unpredictable = []byte("<UNPREDICTABLE>")
illegalShifter = []byte("<illegal shifter operand>")
)
func parseLine(line []byte, encstart []byte) (addr uint32, enc []byte, text string) {
oline := line
i := index(line, ":\t")
if i < 0 {
log.Fatalf("cannot parse disassembly: %q", oline)
}
x, err := strconv.ParseUint(string(trimSpace(line[:i])), 16, 32)
if err != nil {
log.Fatalf("cannot parse disassembly: %q", oline)
}
addr = uint32(x)
line = line[i+2:]
i = bytes.IndexByte(line, '\t')
if i < 0 {
log.Fatalf("cannot parse disassembly: %q", oline)
}
enc, ok := parseHex(line[:i], encstart)
if !ok {
log.Fatalf("cannot parse disassembly: %q", oline)
}
line = trimSpace(line[i:])
if bytes.Contains(line, undefined) {
text = "undefined"
return
}
if bytes.Contains(line, illegalShifter) {
text = "undefined"
return
}
if false && bytes.Contains(line, unpredictable) {
text = "unpredictable"
return
}
if i := bytes.IndexByte(line, ';'); i >= 0 {
line = trimSpace(line[:i])
}
text = string(fixSpace(line))
return
}
func parseContinuation(line []byte, enc []byte) []byte {
i := index(line, ":\t")
if i < 0 {
return nil
}
line = line[i+1:]
enc, _ = parseHex(line, enc)
return enc
}
// writeELF64 writes an ELF64 header to the file,
// describing a text segment that starts at start
// and extends for size bytes.
func writeELF64(f *os.File, size int) error {
f.Seek(0, io.SeekStart)
var hdr elf.Header64
var prog elf.Prog64
var sect elf.Section64
var buf bytes.Buffer
binary.Write(&buf, binary.BigEndian, &hdr)
off1 := buf.Len()
binary.Write(&buf, binary.BigEndian, &prog)
off2 := buf.Len()
binary.Write(&buf, binary.BigEndian, &sect)
off3 := buf.Len()
buf.Reset()
data := byte(elf.ELFDATA2MSB)
hdr = elf.Header64{
Ident: [16]byte{0x7F, 'E', 'L', 'F', 2, data, 1},
Type: 2,
Machine: uint16(elf.EM_PPC64),
Version: 1,
Entry: start,
Phoff: uint64(off1),
Shoff: uint64(off2),
Flags: 0x05000002,
Ehsize: uint16(off1),
Phentsize: uint16(off2 - off1),
Phnum: 1,
Shentsize: uint16(off3 - off2),
Shnum: 3,
Shstrndx: 2,
}
binary.Write(&buf, binary.BigEndian, &hdr)
prog = elf.Prog64{
Type: 1,
Off: start,
Vaddr: start,
Paddr: start,
Filesz: uint64(size),
Memsz: uint64(size),
Flags: 5,
Align: start,
}
binary.Write(&buf, binary.BigEndian, &prog)
binary.Write(&buf, binary.BigEndian, &sect) // NULL section
sect = elf.Section64{
Name: 1,
Type: uint32(elf.SHT_PROGBITS),
Addr: start,
Off: start,
Size: uint64(size),
Flags: uint64(elf.SHF_ALLOC | elf.SHF_EXECINSTR),
Addralign: 4,
}
binary.Write(&buf, binary.BigEndian, &sect) // .text
sect = elf.Section64{
Name: uint32(len("\x00.text\x00")),
Type: uint32(elf.SHT_STRTAB),
Addr: 0,
Off: uint64(off2 + (off3-off2)*3),
Size: uint64(len("\x00.text\x00.shstrtab\x00")),
Addralign: 1,
}
binary.Write(&buf, binary.BigEndian, &sect)
buf.WriteString("\x00.text\x00.shstrtab\x00")
f.Write(buf.Bytes())
return nil
}