144 lines
3.8 KiB
Go
144 lines
3.8 KiB
Go
// Copyright 2018 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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// +build ignore
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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)
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var (
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goos, goarch string
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)
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// cmdLine returns this programs's commandline arguments
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func cmdLine() string {
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return "go run linux/mksysnum.go " + strings.Join(os.Args[1:], " ")
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}
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// buildTags returns build tags
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func buildTags() string {
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return fmt.Sprintf("%s,%s", goarch, goos)
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}
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func format(name string, num int, offset int) string {
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if num > 999 {
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// ignore deprecated syscalls that are no longer implemented
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// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
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return ""
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}
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name = strings.ToUpper(name)
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num = num + offset
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return fmt.Sprintf(" SYS_%s = %d;\n", name, num)
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}
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func checkErr(err error) {
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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}
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// source string and substring slice for regexp
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type re struct {
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str string // source string
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sub []string // matched sub-string
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}
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// Match performs regular expression match
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func (r *re) Match(exp string) bool {
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r.sub = regexp.MustCompile(exp).FindStringSubmatch(r.str)
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if r.sub != nil {
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return true
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}
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return false
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}
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func main() {
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// Get the OS and architecture (using GOARCH_TARGET if it exists)
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goos = os.Getenv("GOOS")
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goarch = os.Getenv("GOARCH_TARGET")
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if goarch == "" {
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goarch = os.Getenv("GOARCH")
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}
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// Check if GOOS and GOARCH environment variables are defined
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if goarch == "" || goos == "" {
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fmt.Fprintf(os.Stderr, "GOARCH or GOOS not defined in environment\n")
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os.Exit(1)
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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.Fprintf(os.Stderr, "In the new build system, mksysnum should not be called directly.\n")
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fmt.Fprintf(os.Stderr, "See README.md\n")
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os.Exit(1)
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}
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cc := os.Getenv("CC")
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if cc == "" {
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fmt.Fprintf(os.Stderr, "CC is not defined in environment\n")
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os.Exit(1)
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}
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args := os.Args[1:]
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args = append([]string{"-E", "-dD"}, args...)
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cmd, err := exec.Command(cc, args...).Output() // execute command and capture output
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if err != nil {
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fmt.Fprintf(os.Stderr, "can't run %s", cc)
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os.Exit(1)
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}
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text := ""
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s := bufio.NewScanner(strings.NewReader(string(cmd)))
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var offset, prev int
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for s.Scan() {
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t := re{str: s.Text()}
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if t.Match(`^#define __NR_Linux\s+([0-9]+)`) {
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// mips/mips64: extract offset
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offset, _ = strconv.Atoi(t.sub[1]) // Make offset=0 if empty or non-numeric
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} else if t.Match(`^#define __NR(\w*)_SYSCALL_BASE\s+([0-9]+)`) {
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// arm: extract offset
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offset, _ = strconv.Atoi(t.sub[1]) // Make offset=0 if empty or non-numeric
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} else if t.Match(`^#define __NR_syscalls\s+`) {
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// ignore redefinitions of __NR_syscalls
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} else if t.Match(`^#define __NR_(\w*)Linux_syscalls\s+`) {
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// mips/mips64: ignore definitions about the number of syscalls
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} else if t.Match(`^#define __NR_(\w+)\s+([0-9]+)`) {
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prev, err = strconv.Atoi(t.sub[2])
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checkErr(err)
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text += format(t.sub[1], prev, offset)
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} else if t.Match(`^#define __NR3264_(\w+)\s+([0-9]+)`) {
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prev, err = strconv.Atoi(t.sub[2])
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checkErr(err)
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text += format(t.sub[1], prev, offset)
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} else if t.Match(`^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)`) {
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r2, err := strconv.Atoi(t.sub[2])
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checkErr(err)
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text += format(t.sub[1], prev+r2, offset)
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} else if t.Match(`^#define __NR_(\w+)\s+\(__NR_(?:SYSCALL_BASE|Linux) \+ ([0-9]+)`) {
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r2, err := strconv.Atoi(t.sub[2])
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checkErr(err)
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text += format(t.sub[1], r2, offset)
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}
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}
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err = s.Err()
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checkErr(err)
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fmt.Printf(template, cmdLine(), buildTags(), text)
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}
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const template = `// %s
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// Code generated by the command above; see README.md. DO NOT EDIT.
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// +build %s
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package unix
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const(
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%s)`
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