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// 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"
"fmt"
"internal/testenv"
"os"
"path/filepath"
"testing"
)
const asmData = `
GLOBL zeros<>(SB),8,$64
TEXT ·testASM(SB),4,$0
VMOVUPS zeros<>(SB), %s // PC relative relocation is off by 1, for Y8-Y15, Z8-15 and Z24-Z31
RET
`
const goData = `
package main
func testASM()
func main() {
testASM()
}
`
func objdumpOutput(t *testing.T, mname, source string) []byte {
tmpdir, err := os.MkdirTemp("", mname)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
err = os.WriteFile(filepath.Join(tmpdir, "go.mod"), []byte(fmt.Sprintf("module %s\n", mname)), 0666)
if err != nil {
t.Fatal(err)
}
tmpfile, err := os.Create(filepath.Join(tmpdir, "input.s"))
if err != nil {
t.Fatal(err)
}
defer tmpfile.Close()
_, err = tmpfile.WriteString(source)
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)
}
cmd := testenv.Command(t,
testenv.GoToolPath(t), "build", "-o",
filepath.Join(tmpdir, "output"))
cmd.Env = append(os.Environ(),
"GOARCH=amd64", "GOOS=linux", "GOPATH="+filepath.Join(tmpdir, "_gopath"))
cmd.Dir = tmpdir
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("error %s output %s", err, out)
}
cmd2 := testenv.Command(t,
testenv.GoToolPath(t), "tool", "objdump", "-s", "testASM",
filepath.Join(tmpdir, "output"))
cmd2.Env = cmd.Env
cmd2.Dir = tmpdir
objout, err := cmd2.CombinedOutput()
if err != nil {
t.Fatalf("error %s output %s", err, objout)
}
return objout
}
func TestVexEvexPCrelative(t *testing.T) {
testenv.MustHaveGoBuild(t)
LOOP:
for _, reg := range []string{"Y0", "Y8", "Z0", "Z8", "Z16", "Z24"} {
asm := fmt.Sprintf(asmData, reg)
objout := objdumpOutput(t, "pcrelative", asm)
data := bytes.Split(objout, []byte("\n"))
for idx := len(data) - 1; idx >= 0; idx-- {
// check that RET wasn't overwritten.
if bytes.Index(data[idx], []byte("RET")) != -1 {
if testing.Short() {
break LOOP
}
continue LOOP
}
}
t.Errorf("VMOVUPS zeros<>(SB), %s overwrote RET", reg)
}
}