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