forked from TrueCloudLab/restic
Vendor dependencies with dep
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Alexander Neumann
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1691 changed files with 466360 additions and 0 deletions
379
vendor/golang.org/x/sys/unix/linux/mkall.go
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379
vendor/golang.org/x/sys/unix/linux/mkall.go
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// linux/mkall.go - Generates all Linux zsysnum, zsyscall, zerror, and ztype
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// files for all 11 linux architectures supported by the go compiler. See
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// README.md for more information about the build system.
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// To run it you must have a git checkout of the Linux kernel and glibc. Once
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// the appropriate sources are ready, the program is run as:
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// go run linux/mkall.go <linux_dir> <glibc_dir>
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// +build ignore
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package main
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import (
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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)
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// These will be paths to the appropriate source directories.
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var LinuxDir string
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var GlibcDir string
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const TempDir = "/tmp"
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const IncludeDir = TempDir + "/include" // To hold our C headers
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const BuildDir = TempDir + "/build" // To hold intermediate build files
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const GOOS = "linux" // Only for Linux targets
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const BuildArch = "amd64" // Must be built on this architecture
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const MinKernel = "2.6.23" // https://golang.org/doc/install#requirements
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type target struct {
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GoArch string // Architecture name according to Go
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LinuxArch string // Architecture name according to the Linux Kernel
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GNUArch string // Architecture name according to GNU tools (https://wiki.debian.org/Multiarch/Tuples)
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BigEndian bool // Default Little Endian
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SignedChar bool // Is -fsigned-char needed (default no)
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Bits int
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}
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// List of the 11 Linux targets supported by the go compiler. sparc64 is not
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// currently supported, though a port is in progress.
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var targets = []target{
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{
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GoArch: "386",
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LinuxArch: "x86",
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GNUArch: "i686-linux-gnu", // Note "i686" not "i386"
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Bits: 32,
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},
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{
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GoArch: "amd64",
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LinuxArch: "x86",
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GNUArch: "x86_64-linux-gnu",
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Bits: 64,
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},
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{
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GoArch: "arm64",
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LinuxArch: "arm64",
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GNUArch: "aarch64-linux-gnu",
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SignedChar: true,
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Bits: 64,
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},
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{
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GoArch: "arm",
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LinuxArch: "arm",
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GNUArch: "arm-linux-gnueabi",
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Bits: 32,
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},
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{
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GoArch: "mips",
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LinuxArch: "mips",
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GNUArch: "mips-linux-gnu",
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BigEndian: true,
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Bits: 32,
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},
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{
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GoArch: "mipsle",
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LinuxArch: "mips",
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GNUArch: "mipsel-linux-gnu",
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Bits: 32,
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},
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{
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GoArch: "mips64",
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LinuxArch: "mips",
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GNUArch: "mips64-linux-gnuabi64",
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BigEndian: true,
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Bits: 64,
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},
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{
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GoArch: "mips64le",
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LinuxArch: "mips",
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GNUArch: "mips64el-linux-gnuabi64",
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Bits: 64,
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},
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{
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GoArch: "ppc64",
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LinuxArch: "powerpc",
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GNUArch: "powerpc64-linux-gnu",
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BigEndian: true,
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Bits: 64,
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},
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{
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GoArch: "ppc64le",
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LinuxArch: "powerpc",
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GNUArch: "powerpc64le-linux-gnu",
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Bits: 64,
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},
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{
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GoArch: "s390x",
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LinuxArch: "s390",
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GNUArch: "s390x-linux-gnu",
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BigEndian: true,
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SignedChar: true,
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Bits: 64,
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},
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// {
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// GoArch: "sparc64",
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// LinuxArch: "sparc",
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// GNUArch: "sparc64-linux-gnu",
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// BigEndian: true,
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// Bits: 64,
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// },
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}
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func main() {
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if runtime.GOOS != GOOS || runtime.GOARCH != BuildArch {
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fmt.Printf("Build system has GOOS_GOARCH = %s_%s, need %s_%s\n",
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runtime.GOOS, runtime.GOARCH, GOOS, BuildArch)
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return
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}
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// Check that we are using the new build system if we should
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if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
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fmt.Println("In the new build system, mkall.go should not be called directly.")
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fmt.Println("See README.md")
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return
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}
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// Parse the command line options
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if len(os.Args) != 3 {
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fmt.Println("USAGE: go run linux/mkall.go <linux_dir> <glibc_dir>")
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return
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}
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LinuxDir = os.Args[1]
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GlibcDir = os.Args[2]
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for _, t := range targets {
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fmt.Printf("----- GENERATING: %s -----\n", t.GoArch)
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if err := t.generateFiles(); err != nil {
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fmt.Printf("%v\n***** FAILURE: %s *****\n\n", err, t.GoArch)
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} else {
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fmt.Printf("----- SUCCESS: %s -----\n\n", t.GoArch)
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}
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}
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}
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// Makes an exec.Cmd with Stderr attached to os.Stderr
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func makeCommand(name string, args ...string) *exec.Cmd {
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cmd := exec.Command(name, args...)
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cmd.Stderr = os.Stderr
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return cmd
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}
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// Runs the command, pipes output to a formatter, pipes that to an output file.
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func (t *target) commandFormatOutput(formatter string, outputFile string,
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name string, args ...string) (err error) {
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mainCmd := makeCommand(name, args...)
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fmtCmd := makeCommand(formatter)
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if formatter == "mkpost" {
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fmtCmd = makeCommand("go", "run", "mkpost.go")
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// Set GOARCH_TARGET so mkpost knows what GOARCH is..
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fmtCmd.Env = append(os.Environ(), "GOARCH_TARGET="+t.GoArch)
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// Set GOARCH to host arch for mkpost, so it can run natively.
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for i, s := range fmtCmd.Env {
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if strings.HasPrefix(s, "GOARCH=") {
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fmtCmd.Env[i] = "GOARCH=" + BuildArch
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}
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}
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}
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// mainCmd | fmtCmd > outputFile
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if fmtCmd.Stdin, err = mainCmd.StdoutPipe(); err != nil {
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return
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}
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if fmtCmd.Stdout, err = os.Create(outputFile); err != nil {
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return
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}
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// Make sure the formatter eventually closes
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if err = fmtCmd.Start(); err != nil {
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return
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}
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defer func() {
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fmtErr := fmtCmd.Wait()
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if err == nil {
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err = fmtErr
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}
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}()
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return mainCmd.Run()
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}
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// Generates all the files for a Linux target
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func (t *target) generateFiles() error {
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// Setup environment variables
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os.Setenv("GOOS", GOOS)
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os.Setenv("GOARCH", t.GoArch)
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// Get appropriate compiler and emulator (unless on x86)
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if t.LinuxArch != "x86" {
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// Check/Setup cross compiler
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compiler := t.GNUArch + "-gcc"
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if _, err := exec.LookPath(compiler); err != nil {
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return err
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}
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os.Setenv("CC", compiler)
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// Check/Setup emulator (usually first component of GNUArch)
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qemuArchName := t.GNUArch[:strings.Index(t.GNUArch, "-")]
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if t.LinuxArch == "powerpc" {
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qemuArchName = t.GoArch
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}
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os.Setenv("GORUN", "qemu-"+qemuArchName)
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} else {
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os.Setenv("CC", "gcc")
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}
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// Make the include directory and fill it with headers
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if err := os.MkdirAll(IncludeDir, os.ModePerm); err != nil {
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return err
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}
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defer os.RemoveAll(IncludeDir)
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if err := t.makeHeaders(); err != nil {
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return fmt.Errorf("could not make header files: %v", err)
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}
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fmt.Println("header files generated")
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// Make each of the four files
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if err := t.makeZSysnumFile(); err != nil {
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return fmt.Errorf("could not make zsysnum file: %v", err)
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}
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fmt.Println("zsysnum file generated")
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if err := t.makeZSyscallFile(); err != nil {
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return fmt.Errorf("could not make zsyscall file: %v", err)
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}
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fmt.Println("zsyscall file generated")
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if err := t.makeZTypesFile(); err != nil {
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return fmt.Errorf("could not make ztypes file: %v", err)
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}
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fmt.Println("ztypes file generated")
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if err := t.makeZErrorsFile(); err != nil {
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return fmt.Errorf("could not make zerrors file: %v", err)
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}
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fmt.Println("zerrors file generated")
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return nil
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}
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// Create the Linux and glibc headers in the include directory.
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func (t *target) makeHeaders() error {
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// Make the Linux headers we need for this architecture
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linuxMake := makeCommand("make", "headers_install", "ARCH="+t.LinuxArch, "INSTALL_HDR_PATH="+TempDir)
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linuxMake.Dir = LinuxDir
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if err := linuxMake.Run(); err != nil {
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return err
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}
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// A Temporary build directory for glibc
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if err := os.MkdirAll(BuildDir, os.ModePerm); err != nil {
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return err
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}
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defer os.RemoveAll(BuildDir)
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// Make the glibc headers we need for this architecture
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confScript := filepath.Join(GlibcDir, "configure")
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glibcConf := makeCommand(confScript, "--prefix="+TempDir, "--host="+t.GNUArch, "--enable-kernel="+MinKernel)
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glibcConf.Dir = BuildDir
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if err := glibcConf.Run(); err != nil {
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return err
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}
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glibcMake := makeCommand("make", "install-headers")
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glibcMake.Dir = BuildDir
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if err := glibcMake.Run(); err != nil {
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return err
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}
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// We only need an empty stubs file
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stubsFile := filepath.Join(IncludeDir, "gnu/stubs.h")
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if file, err := os.Create(stubsFile); err != nil {
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return err
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} else {
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file.Close()
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}
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return nil
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}
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// makes the zsysnum_linux_$GOARCH.go file
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func (t *target) makeZSysnumFile() error {
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zsysnumFile := fmt.Sprintf("zsysnum_linux_%s.go", t.GoArch)
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unistdFile := filepath.Join(IncludeDir, "asm/unistd.h")
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args := append(t.cFlags(), unistdFile)
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return t.commandFormatOutput("gofmt", zsysnumFile, "linux/mksysnum.pl", args...)
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}
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// makes the zsyscall_linux_$GOARCH.go file
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func (t *target) makeZSyscallFile() error {
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zsyscallFile := fmt.Sprintf("zsyscall_linux_%s.go", t.GoArch)
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// Find the correct architecture syscall file (might end with x.go)
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archSyscallFile := fmt.Sprintf("syscall_linux_%s.go", t.GoArch)
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if _, err := os.Stat(archSyscallFile); os.IsNotExist(err) {
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shortArch := strings.TrimSuffix(t.GoArch, "le")
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archSyscallFile = fmt.Sprintf("syscall_linux_%sx.go", shortArch)
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}
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args := append(t.mksyscallFlags(), "-tags", "linux,"+t.GoArch,
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"syscall_linux.go", archSyscallFile)
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return t.commandFormatOutput("gofmt", zsyscallFile, "./mksyscall.pl", args...)
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}
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// makes the zerrors_linux_$GOARCH.go file
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func (t *target) makeZErrorsFile() error {
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zerrorsFile := fmt.Sprintf("zerrors_linux_%s.go", t.GoArch)
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return t.commandFormatOutput("gofmt", zerrorsFile, "./mkerrors.sh", t.cFlags()...)
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}
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// makes the ztypes_linux_$GOARCH.go file
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func (t *target) makeZTypesFile() error {
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ztypesFile := fmt.Sprintf("ztypes_linux_%s.go", t.GoArch)
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args := []string{"tool", "cgo", "-godefs", "--"}
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args = append(args, t.cFlags()...)
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args = append(args, "linux/types.go")
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return t.commandFormatOutput("mkpost", ztypesFile, "go", args...)
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}
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// Flags that should be given to gcc and cgo for this target
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func (t *target) cFlags() []string {
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// Compile statically to avoid cross-architecture dynamic linking.
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flags := []string{"-Wall", "-Werror", "-static", "-I" + IncludeDir}
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// Architecture-specific flags
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if t.SignedChar {
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flags = append(flags, "-fsigned-char")
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}
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if t.LinuxArch == "x86" {
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flags = append(flags, fmt.Sprintf("-m%d", t.Bits))
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}
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return flags
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}
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// Flags that should be given to mksyscall for this target
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func (t *target) mksyscallFlags() (flags []string) {
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if t.Bits == 32 {
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if t.BigEndian {
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flags = append(flags, "-b32")
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} else {
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flags = append(flags, "-l32")
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}
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}
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// This flag menas a 64-bit value should use (even, odd)-pair.
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if t.GoArch == "arm" || (t.LinuxArch == "mips" && t.Bits == 32) {
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flags = append(flags, "-arm")
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}
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return
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}
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