+++ /dev/null
-// 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.
-
-// linux/mkall.go - Generates all Linux zsysnum, zsyscall, zerror, and ztype
-// files for all 11 linux architectures supported by the go compiler. See
-// README.md for more information about the build system.
-
-// To run it you must have a git checkout of the Linux kernel and glibc. Once
-// the appropriate sources are ready, the program is run as:
-// go run linux/mkall.go <linux_dir> <glibc_dir>
-
-// +build ignore
-
-package main
-
-import (
- "fmt"
- "os"
- "os/exec"
- "path/filepath"
- "runtime"
- "strings"
-)
-
-// These will be paths to the appropriate source directories.
-var LinuxDir string
-var GlibcDir string
-
-const TempDir = "/tmp"
-const IncludeDir = TempDir + "/include" // To hold our C headers
-const BuildDir = TempDir + "/build" // To hold intermediate build files
-
-const GOOS = "linux" // Only for Linux targets
-const BuildArch = "amd64" // Must be built on this architecture
-const MinKernel = "2.6.23" // https://golang.org/doc/install#requirements
-
-type target struct {
- GoArch string // Architecture name according to Go
- LinuxArch string // Architecture name according to the Linux Kernel
- GNUArch string // Architecture name according to GNU tools (https://wiki.debian.org/Multiarch/Tuples)
- BigEndian bool // Default Little Endian
- SignedChar bool // Is -fsigned-char needed (default no)
- Bits int
-}
-
-// List of the 11 Linux targets supported by the go compiler. sparc64 is not
-// currently supported, though a port is in progress.
-var targets = []target{
- {
- GoArch: "386",
- LinuxArch: "x86",
- GNUArch: "i686-linux-gnu", // Note "i686" not "i386"
- Bits: 32,
- },
- {
- GoArch: "amd64",
- LinuxArch: "x86",
- GNUArch: "x86_64-linux-gnu",
- Bits: 64,
- },
- {
- GoArch: "arm64",
- LinuxArch: "arm64",
- GNUArch: "aarch64-linux-gnu",
- SignedChar: true,
- Bits: 64,
- },
- {
- GoArch: "arm",
- LinuxArch: "arm",
- GNUArch: "arm-linux-gnueabi",
- Bits: 32,
- },
- {
- GoArch: "mips",
- LinuxArch: "mips",
- GNUArch: "mips-linux-gnu",
- BigEndian: true,
- Bits: 32,
- },
- {
- GoArch: "mipsle",
- LinuxArch: "mips",
- GNUArch: "mipsel-linux-gnu",
- Bits: 32,
- },
- {
- GoArch: "mips64",
- LinuxArch: "mips",
- GNUArch: "mips64-linux-gnuabi64",
- BigEndian: true,
- Bits: 64,
- },
- {
- GoArch: "mips64le",
- LinuxArch: "mips",
- GNUArch: "mips64el-linux-gnuabi64",
- Bits: 64,
- },
- {
- GoArch: "ppc64",
- LinuxArch: "powerpc",
- GNUArch: "powerpc64-linux-gnu",
- BigEndian: true,
- Bits: 64,
- },
- {
- GoArch: "ppc64le",
- LinuxArch: "powerpc",
- GNUArch: "powerpc64le-linux-gnu",
- Bits: 64,
- },
- {
- GoArch: "s390x",
- LinuxArch: "s390",
- GNUArch: "s390x-linux-gnu",
- BigEndian: true,
- SignedChar: true,
- Bits: 64,
- },
- // {
- // GoArch: "sparc64",
- // LinuxArch: "sparc",
- // GNUArch: "sparc64-linux-gnu",
- // BigEndian: true,
- // Bits: 64,
- // },
-}
-
-func main() {
- if runtime.GOOS != GOOS || runtime.GOARCH != BuildArch {
- fmt.Printf("Build system has GOOS_GOARCH = %s_%s, need %s_%s\n",
- runtime.GOOS, runtime.GOARCH, GOOS, BuildArch)
- return
- }
-
- // Check that we are using the new build system if we should
- if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
- fmt.Println("In the new build system, mkall.go should not be called directly.")
- fmt.Println("See README.md")
- return
- }
-
- // Parse the command line options
- if len(os.Args) != 3 {
- fmt.Println("USAGE: go run linux/mkall.go <linux_dir> <glibc_dir>")
- return
- }
- LinuxDir = os.Args[1]
- GlibcDir = os.Args[2]
-
- for _, t := range targets {
- fmt.Printf("----- GENERATING: %s -----\n", t.GoArch)
- if err := t.generateFiles(); err != nil {
- fmt.Printf("%v\n***** FAILURE: %s *****\n\n", err, t.GoArch)
- } else {
- fmt.Printf("----- SUCCESS: %s -----\n\n", t.GoArch)
- }
- }
-}
-
-// Makes an exec.Cmd with Stderr attached to os.Stderr
-func makeCommand(name string, args ...string) *exec.Cmd {
- cmd := exec.Command(name, args...)
- cmd.Stderr = os.Stderr
- return cmd
-}
-
-// Runs the command, pipes output to a formatter, pipes that to an output file.
-func (t *target) commandFormatOutput(formatter string, outputFile string,
- name string, args ...string) (err error) {
- mainCmd := makeCommand(name, args...)
-
- fmtCmd := makeCommand(formatter)
- if formatter == "mkpost" {
- fmtCmd = makeCommand("go", "run", "mkpost.go")
- // Set GOARCH_TARGET so mkpost knows what GOARCH is..
- fmtCmd.Env = append(os.Environ(), "GOARCH_TARGET="+t.GoArch)
- // Set GOARCH to host arch for mkpost, so it can run natively.
- for i, s := range fmtCmd.Env {
- if strings.HasPrefix(s, "GOARCH=") {
- fmtCmd.Env[i] = "GOARCH=" + BuildArch
- }
- }
- }
-
- // mainCmd | fmtCmd > outputFile
- if fmtCmd.Stdin, err = mainCmd.StdoutPipe(); err != nil {
- return
- }
- if fmtCmd.Stdout, err = os.Create(outputFile); err != nil {
- return
- }
-
- // Make sure the formatter eventually closes
- if err = fmtCmd.Start(); err != nil {
- return
- }
- defer func() {
- fmtErr := fmtCmd.Wait()
- if err == nil {
- err = fmtErr
- }
- }()
-
- return mainCmd.Run()
-}
-
-// Generates all the files for a Linux target
-func (t *target) generateFiles() error {
- // Setup environment variables
- os.Setenv("GOOS", GOOS)
- os.Setenv("GOARCH", t.GoArch)
-
- // Get appropriate compiler and emulator (unless on x86)
- if t.LinuxArch != "x86" {
- // Check/Setup cross compiler
- compiler := t.GNUArch + "-gcc"
- if _, err := exec.LookPath(compiler); err != nil {
- return err
- }
- os.Setenv("CC", compiler)
-
- // Check/Setup emulator (usually first component of GNUArch)
- qemuArchName := t.GNUArch[:strings.Index(t.GNUArch, "-")]
- if t.LinuxArch == "powerpc" {
- qemuArchName = t.GoArch
- }
- os.Setenv("GORUN", "qemu-"+qemuArchName)
- } else {
- os.Setenv("CC", "gcc")
- }
-
- // Make the include directory and fill it with headers
- if err := os.MkdirAll(IncludeDir, os.ModePerm); err != nil {
- return err
- }
- defer os.RemoveAll(IncludeDir)
- if err := t.makeHeaders(); err != nil {
- return fmt.Errorf("could not make header files: %v", err)
- }
- fmt.Println("header files generated")
-
- // Make each of the four files
- if err := t.makeZSysnumFile(); err != nil {
- return fmt.Errorf("could not make zsysnum file: %v", err)
- }
- fmt.Println("zsysnum file generated")
-
- if err := t.makeZSyscallFile(); err != nil {
- return fmt.Errorf("could not make zsyscall file: %v", err)
- }
- fmt.Println("zsyscall file generated")
-
- if err := t.makeZTypesFile(); err != nil {
- return fmt.Errorf("could not make ztypes file: %v", err)
- }
- fmt.Println("ztypes file generated")
-
- if err := t.makeZErrorsFile(); err != nil {
- return fmt.Errorf("could not make zerrors file: %v", err)
- }
- fmt.Println("zerrors file generated")
-
- return nil
-}
-
-// Create the Linux and glibc headers in the include directory.
-func (t *target) makeHeaders() error {
- // Make the Linux headers we need for this architecture
- linuxMake := makeCommand("make", "headers_install", "ARCH="+t.LinuxArch, "INSTALL_HDR_PATH="+TempDir)
- linuxMake.Dir = LinuxDir
- if err := linuxMake.Run(); err != nil {
- return err
- }
-
- // A Temporary build directory for glibc
- if err := os.MkdirAll(BuildDir, os.ModePerm); err != nil {
- return err
- }
- defer os.RemoveAll(BuildDir)
-
- // Make the glibc headers we need for this architecture
- confScript := filepath.Join(GlibcDir, "configure")
- glibcConf := makeCommand(confScript, "--prefix="+TempDir, "--host="+t.GNUArch, "--enable-kernel="+MinKernel)
- glibcConf.Dir = BuildDir
- if err := glibcConf.Run(); err != nil {
- return err
- }
- glibcMake := makeCommand("make", "install-headers")
- glibcMake.Dir = BuildDir
- if err := glibcMake.Run(); err != nil {
- return err
- }
- // We only need an empty stubs file
- stubsFile := filepath.Join(IncludeDir, "gnu/stubs.h")
- if file, err := os.Create(stubsFile); err != nil {
- return err
- } else {
- file.Close()
- }
-
- return nil
-}
-
-// makes the zsysnum_linux_$GOARCH.go file
-func (t *target) makeZSysnumFile() error {
- zsysnumFile := fmt.Sprintf("zsysnum_linux_%s.go", t.GoArch)
- unistdFile := filepath.Join(IncludeDir, "asm/unistd.h")
-
- args := append(t.cFlags(), unistdFile)
- return t.commandFormatOutput("gofmt", zsysnumFile, "linux/mksysnum.pl", args...)
-}
-
-// makes the zsyscall_linux_$GOARCH.go file
-func (t *target) makeZSyscallFile() error {
- zsyscallFile := fmt.Sprintf("zsyscall_linux_%s.go", t.GoArch)
- // Find the correct architecture syscall file (might end with x.go)
- archSyscallFile := fmt.Sprintf("syscall_linux_%s.go", t.GoArch)
- if _, err := os.Stat(archSyscallFile); os.IsNotExist(err) {
- shortArch := strings.TrimSuffix(t.GoArch, "le")
- archSyscallFile = fmt.Sprintf("syscall_linux_%sx.go", shortArch)
- }
-
- args := append(t.mksyscallFlags(), "-tags", "linux,"+t.GoArch,
- "syscall_linux.go", archSyscallFile)
- return t.commandFormatOutput("gofmt", zsyscallFile, "./mksyscall.pl", args...)
-}
-
-// makes the zerrors_linux_$GOARCH.go file
-func (t *target) makeZErrorsFile() error {
- zerrorsFile := fmt.Sprintf("zerrors_linux_%s.go", t.GoArch)
-
- return t.commandFormatOutput("gofmt", zerrorsFile, "./mkerrors.sh", t.cFlags()...)
-}
-
-// makes the ztypes_linux_$GOARCH.go file
-func (t *target) makeZTypesFile() error {
- ztypesFile := fmt.Sprintf("ztypes_linux_%s.go", t.GoArch)
-
- args := []string{"tool", "cgo", "-godefs", "--"}
- args = append(args, t.cFlags()...)
- args = append(args, "linux/types.go")
- return t.commandFormatOutput("mkpost", ztypesFile, "go", args...)
-}
-
-// Flags that should be given to gcc and cgo for this target
-func (t *target) cFlags() []string {
- // Compile statically to avoid cross-architecture dynamic linking.
- flags := []string{"-Wall", "-Werror", "-static", "-I" + IncludeDir}
-
- // Architecture-specific flags
- if t.SignedChar {
- flags = append(flags, "-fsigned-char")
- }
- if t.LinuxArch == "x86" {
- flags = append(flags, fmt.Sprintf("-m%d", t.Bits))
- }
-
- return flags
-}
-
-// Flags that should be given to mksyscall for this target
-func (t *target) mksyscallFlags() (flags []string) {
- if t.Bits == 32 {
- if t.BigEndian {
- flags = append(flags, "-b32")
- } else {
- flags = append(flags, "-l32")
- }
- }
-
- // This flag menas a 64-bit value should use (even, odd)-pair.
- if t.GoArch == "arm" || (t.LinuxArch == "mips" && t.Bits == 32) {
- flags = append(flags, "-arm")
- }
- return
-}
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