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- // Copyright 2018 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.
- //go:build ignore
- // mkasm.go generates assembly trampolines to call library routines from Go.
- // This program must be run after mksyscall.pl.
- package main
- import (
- "bytes"
- "fmt"
- "log"
- "os"
- "strings"
- )
- func main() {
- if len(os.Args) != 3 {
- log.Fatalf("Usage: %s <goos> <arch>", os.Args[0])
- }
- goos, arch := os.Args[1], os.Args[2]
- syscallFilename := fmt.Sprintf("syscall_%s.go", goos)
- syscallArchFilename := fmt.Sprintf("syscall_%s_%s.go", goos, arch)
- in1, err := os.ReadFile(syscallFilename)
- if err != nil {
- log.Fatalf("can't open syscall file: %s", err)
- }
- in2, err := os.ReadFile(syscallArchFilename)
- if err != nil {
- log.Fatalf("can't open syscall file: %s", err)
- }
- in3, err := os.ReadFile("z" + syscallArchFilename)
- if err != nil {
- log.Fatalf("can't open syscall file: %s", err)
- }
- in := string(in1) + string(in2) + string(in3)
- trampolines := map[string]bool{}
- var out bytes.Buffer
- fmt.Fprintf(&out, "// go run mkasm.go %s\n", strings.Join(os.Args[1:], " "))
- fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
- fmt.Fprintf(&out, "#include \"textflag.h\"\n")
- for _, line := range strings.Split(in, "\n") {
- if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
- continue
- }
- fn := line[5 : len(line)-13]
- if !trampolines[fn] {
- trampolines[fn] = true
- fmt.Fprintf(&out, "TEXT ·%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
- fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
- }
- }
- err = os.WriteFile(fmt.Sprintf("zsyscall_%s_%s.s", goos, arch), out.Bytes(), 0644)
- if err != nil {
- log.Fatalf("can't write syscall file: %s", err)
- }
- }
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