diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/linux/mkall.go')
| -rw-r--r-- | vendor/golang.org/x/sys/unix/linux/mkall.go | 482 |
1 files changed, 0 insertions, 482 deletions
diff --git a/vendor/golang.org/x/sys/unix/linux/mkall.go b/vendor/golang.org/x/sys/unix/linux/mkall.go deleted file mode 100644 index 89b2fe886..000000000 --- a/vendor/golang.org/x/sys/unix/linux/mkall.go +++ /dev/null @@ -1,482 +0,0 @@ -// 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 ( - "bufio" - "bytes" - "fmt" - "io" - "io/ioutil" - "os" - "os/exec" - "path/filepath" - "runtime" - "strings" - "unicode" -) - -// 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, - // }, -} - -// ptracePairs is a list of pairs of targets that can, in some cases, -// run each other's binaries. -var ptracePairs = []struct{ a1, a2 string }{ - {"386", "amd64"}, - {"arm", "arm64"}, - {"mips", "mips64"}, - {"mipsle", "mips64le"}, -} - -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) - } - } - - fmt.Printf("----- GENERATING ptrace pairs -----\n") - ok := true - for _, p := range ptracePairs { - if err := generatePtracePair(p.a1, p.a2); err != nil { - fmt.Printf("%v\n***** FAILURE: %s/%s *****\n\n", err, p.a1, p.a2) - ok = false - } - } - if ok { - fmt.Printf("----- SUCCESS ptrace pairs -----\n\n") - } -} - -// 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 -} - -// generatePtracePair takes a pair of GOARCH values that can run each -// other's binaries, such as 386 and amd64. It extracts the PtraceRegs -// type for each one. It writes a new file defining the types -// PtraceRegsArch1 and PtraceRegsArch2 and the corresponding functions -// Ptrace{Get,Set}Regs{arch1,arch2}. This permits debugging the other -// binary on a native system. -func generatePtracePair(arch1, arch2 string) error { - def1, err := ptraceDef(arch1) - if err != nil { - return err - } - def2, err := ptraceDef(arch2) - if err != nil { - return err - } - f, err := os.Create(fmt.Sprintf("zptrace%s_linux.go", arch1)) - if err != nil { - return err - } - buf := bufio.NewWriter(f) - fmt.Fprintf(buf, "// Code generated by linux/mkall.go generatePtracePair(%s, %s). DO NOT EDIT.\n", arch1, arch2) - fmt.Fprintf(buf, "\n") - fmt.Fprintf(buf, "// +build linux\n") - fmt.Fprintf(buf, "// +build %s %s\n", arch1, arch2) - fmt.Fprintf(buf, "\n") - fmt.Fprintf(buf, "package unix\n") - fmt.Fprintf(buf, "\n") - fmt.Fprintf(buf, "%s\n", `import "unsafe"`) - fmt.Fprintf(buf, "\n") - writeOnePtrace(buf, arch1, def1) - fmt.Fprintf(buf, "\n") - writeOnePtrace(buf, arch2, def2) - if err := buf.Flush(); err != nil { - return err - } - if err := f.Close(); err != nil { - return err - } - return nil -} - -// ptraceDef returns the definition of PtraceRegs for arch. -func ptraceDef(arch string) (string, error) { - filename := fmt.Sprintf("ztypes_linux_%s.go", arch) - data, err := ioutil.ReadFile(filename) - if err != nil { - return "", fmt.Errorf("reading %s: %v", filename, err) - } - start := bytes.Index(data, []byte("type PtraceRegs struct")) - if start < 0 { - return "", fmt.Errorf("%s: no definition of PtraceRegs", filename) - } - data = data[start:] - end := bytes.Index(data, []byte("\n}\n")) - if end < 0 { - return "", fmt.Errorf("%s: can't find end of PtraceRegs definition", filename) - } - return string(data[:end+2]), nil -} - -// writeOnePtrace writes out the ptrace definitions for arch. -func writeOnePtrace(w io.Writer, arch, def string) { - uarch := string(unicode.ToUpper(rune(arch[0]))) + arch[1:] - fmt.Fprintf(w, "// PtraceRegs%s is the registers used by %s binaries.\n", uarch, arch) - fmt.Fprintf(w, "%s\n", strings.Replace(def, "PtraceRegs", "PtraceRegs"+uarch, 1)) - fmt.Fprintf(w, "\n") - fmt.Fprintf(w, "// PtraceGetRegs%s fetches the registers used by %s binaries.\n", uarch, arch) - fmt.Fprintf(w, "func PtraceGetRegs%s(pid int, regsout *PtraceRegs%s) error {\n", uarch, uarch) - fmt.Fprintf(w, "\treturn ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout)))\n") - fmt.Fprintf(w, "}\n") - fmt.Fprintf(w, "\n") - fmt.Fprintf(w, "// PtraceSetRegs%s sets the registers used by %s binaries.\n", uarch, arch) - fmt.Fprintf(w, "func PtraceSetRegs%s(pid int, regs *PtraceRegs%s) error {\n", uarch, uarch) - fmt.Fprintf(w, "\treturn ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs)))\n") - fmt.Fprintf(w, "}\n") -} |