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// Copyright 2019 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.
// +build dragonfly freebsd linux netbsd openbsd
package main
import (
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
)
var asmSource = `
.section .text1,"ax"
s1:
.byte 0
.section .text2,"ax"
s2:
.byte 0
`
var goSource = `
package main
func main() {}
`
// The linker used to crash if an ELF input file had multiple text sections
// with the same name.
func TestSectionsWithSameName(t *testing.T) {
testenv.MustHaveGoBuild(t)
testenv.MustHaveCGO(t)
t.Parallel()
objcopy, err := exec.LookPath("objcopy")
if err != nil {
t.Skipf("can't find objcopy: %v", err)
}
dir, err := ioutil.TempDir("", "go-link-TestSectionsWithSameName")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
gopath := filepath.Join(dir, "GOPATH")
env := append(os.Environ(), "GOPATH="+gopath)
if err := ioutil.WriteFile(filepath.Join(dir, "go.mod"), []byte("module elf_test\n"), 0666); err != nil {
t.Fatal(err)
}
asmFile := filepath.Join(dir, "x.s")
if err := ioutil.WriteFile(asmFile, []byte(asmSource), 0444); err != nil {
t.Fatal(err)
}
goTool := testenv.GoToolPath(t)
cmd := exec.Command(goTool, "env", "CC")
cmd.Env = env
ccb, err := cmd.Output()
if err != nil {
t.Fatal(err)
}
cc := strings.TrimSpace(string(ccb))
cmd = exec.Command(goTool, "env", "GOGCCFLAGS")
cmd.Env = env
cflagsb, err := cmd.Output()
if err != nil {
t.Fatal(err)
}
cflags := strings.Fields(string(cflagsb))
asmObj := filepath.Join(dir, "x.o")
t.Logf("%s %v -c -o %s %s", cc, cflags, asmObj, asmFile)
if out, err := exec.Command(cc, append(cflags, "-c", "-o", asmObj, asmFile)...).CombinedOutput(); err != nil {
t.Logf("%s", out)
t.Fatal(err)
}
asm2Obj := filepath.Join(dir, "x2.syso")
t.Logf("%s --rename-section .text2=.text1 %s %s", objcopy, asmObj, asm2Obj)
if out, err := exec.Command(objcopy, "--rename-section", ".text2=.text1", asmObj, asm2Obj).CombinedOutput(); err != nil {
t.Logf("%s", out)
t.Fatal(err)
}
for _, s := range []string{asmFile, asmObj} {
if err := os.Remove(s); err != nil {
t.Fatal(err)
}
}
goFile := filepath.Join(dir, "main.go")
if err := ioutil.WriteFile(goFile, []byte(goSource), 0444); err != nil {
t.Fatal(err)
}
cmd = exec.Command(goTool, "build")
cmd.Dir = dir
cmd.Env = env
t.Logf("%s build", goTool)
if out, err := cmd.CombinedOutput(); err != nil {
t.Logf("%s", out)
t.Fatal(err)
}
}
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