blob: 2fe227ee3f2396b440c39eb1d3c278c81ae6f9af [file] [log] [blame]
// Copyright 2017 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.
package x86_test
import (
"bytes"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
)
const asmData = `
GLOBL zeros<>(SB),8,$64
TEXT ·testASM(SB),4,$0
VMOVDQU zeros<>(SB), Y8 // PC relative relocation is off by 1, for Y8-15
RET
`
const goData = `
package main
func testASM()
func main() {
testASM()
}
`
func objdumpOutput(t *testing.T) []byte {
cwd, err := os.Getwd()
if err != nil {
t.Fatal(err)
}
tmpdir, err := ioutil.TempDir("", "19518")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
tmpfile, err := os.Create(filepath.Join(tmpdir, "input.s"))
if err != nil {
t.Fatal(err)
}
defer tmpfile.Close()
_, err = tmpfile.WriteString(asmData)
if err != nil {
t.Fatal(err)
}
tmpfile2, err := os.Create(filepath.Join(tmpdir, "input.go"))
if err != nil {
t.Fatal(err)
}
defer tmpfile2.Close()
_, err = tmpfile2.WriteString(goData)
if err != nil {
t.Fatal(err)
}
err = os.Chdir(tmpdir)
if err != nil {
t.Fatal(err)
}
cmd := exec.Command(
testenv.GoToolPath(t), "build", "-o",
filepath.Join(tmpdir, "output"))
var env []string
for _, v := range os.Environ() {
if !strings.HasPrefix(v, "GOARCH=") {
env = append(env, v)
}
}
cmd.Env = append(env, "GOARCH=amd64")
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("error %s output %s", err, out)
}
cmd2 := exec.Command(
testenv.GoToolPath(t), "tool", "objdump", "-s", "testASM",
filepath.Join(tmpdir, "output"))
cmd2.Env = cmd.Env
objout, err := cmd2.CombinedOutput()
if err != nil {
t.Fatalf("error %s output %s", err, objout)
}
err = os.Chdir(cwd)
if err != nil {
t.Fatal(err)
}
return objout
}
func TestVexPCrelative(t *testing.T) {
testenv.MustHaveGoBuild(t)
objout := objdumpOutput(t)
data := bytes.Split(objout, []byte("\n"))
for idx := len(data) - 1; idx >= 0; idx-- {
// OBJDUMP doesn't know about VMOVDQU,
// so instead of checking that it was assembled correctly,
// check that RET wasn't overwritten.
if bytes.Index(data[idx], []byte("RET")) != -1 {
return
}
}
t.Fatal("RET was overwritten")
}