зеркало из https://github.com/golang/sys.git
141 строка
3.8 KiB
Go
141 строка
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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//go:build ignore
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// +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.go.
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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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"io/ioutil"
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"log"
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"os"
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"sort"
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"strings"
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)
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func archPtrSize(arch string) int {
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switch arch {
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case "386", "arm":
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return 4
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case "amd64", "arm64", "mips64", "ppc64", "riscv64":
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return 8
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default:
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log.Fatalf("Unknown arch %q", arch)
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return 0
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}
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}
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func generateASMFile(goos, arch string, inFileNames []string, outFileName string) map[string]bool {
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trampolines := map[string]bool{}
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var orderedTrampolines []string
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for _, inFileName := range inFileNames {
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in, err := ioutil.ReadFile(inFileName)
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if err != nil {
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log.Fatalf("Failed to read file: %v", err)
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}
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for _, line := range strings.Split(string(in), "\n") {
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const prefix = "var "
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const suffix = "_trampoline_addr uintptr"
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if !strings.HasPrefix(line, prefix) || !strings.HasSuffix(line, suffix) {
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continue
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}
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fn := strings.TrimSuffix(strings.TrimPrefix(line, prefix), suffix)
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if !trampolines[fn] {
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orderedTrampolines = append(orderedTrampolines, fn)
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trampolines[fn] = true
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}
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}
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}
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ptrSize := archPtrSize(arch)
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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, "\n")
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fmt.Fprintf(&out, "#include \"textflag.h\"\n")
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for _, fn := range orderedTrampolines {
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fmt.Fprintf(&out, "\nTEXT %s_trampoline<>(SB),NOSPLIT,$0-0\n", fn)
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if goos == "openbsd" && arch == "ppc64" {
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fmt.Fprintf(&out, "\tCALL\t%s(SB)\n", fn)
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fmt.Fprintf(&out, "\tRET\n")
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} else {
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fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
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}
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fmt.Fprintf(&out, "GLOBL\t·%s_trampoline_addr(SB), RODATA, $%d\n", fn, ptrSize)
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fmt.Fprintf(&out, "DATA\t·%s_trampoline_addr(SB)/%d, $%s_trampoline<>(SB)\n", fn, ptrSize, fn)
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}
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if err := ioutil.WriteFile(outFileName, out.Bytes(), 0644); err != nil {
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log.Fatalf("Failed to write assembly file %q: %v", outFileName, err)
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}
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return trampolines
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}
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const darwinTestTemplate = `// go run mkasm.go %s
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// Code generated by the command above; DO NOT EDIT.
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//go:build darwin && go1.12
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// +build darwin,go1.12
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package unix
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// All the _trampoline functions in zsyscall_darwin_%s.s.
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var darwinTests = [...]darwinTest{
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%s}
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`
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func writeDarwinTest(trampolines map[string]bool, fileName, arch string) {
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var sortedTrampolines []string
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for fn := range trampolines {
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sortedTrampolines = append(sortedTrampolines, fn)
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}
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sort.Strings(sortedTrampolines)
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var out bytes.Buffer
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const prefix = "libc_"
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for _, fn := range sortedTrampolines {
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fmt.Fprintf(&out, fmt.Sprintf("\t{%q, %s_trampoline_addr},\n", strings.TrimPrefix(fn, prefix), fn))
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}
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lines := out.String()
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out.Reset()
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fmt.Fprintf(&out, darwinTestTemplate, strings.Join(os.Args[1:], " "), arch, lines)
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if err := ioutil.WriteFile(fileName, out.Bytes(), 0644); err != nil {
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log.Fatalf("Failed to write test file %q: %v", fileName, err)
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}
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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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zsyscallArchFilename := fmt.Sprintf("zsyscall_%s_%s.go", goos, arch)
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zsyscallASMFileName := fmt.Sprintf("zsyscall_%s_%s.s", goos, arch)
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inFileNames := []string{
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syscallFilename,
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syscallArchFilename,
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zsyscallArchFilename,
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}
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trampolines := generateASMFile(goos, arch, inFileNames, zsyscallASMFileName)
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if goos == "darwin" {
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writeDarwinTest(trampolines, fmt.Sprintf("darwin_%s_test.go", arch), arch)
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}
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}
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