blob: 4548b993dbcc52a83ba7e944a6d7d8dd9de3b049 [file] [log] [blame]
Scott Bakeree6a0872019-10-29 15:59:52 -07001// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build ignore
6
7// mkasm_darwin.go generates assembly trampolines to call libSystem routines from Go.
8//This program must be run after mksyscall.go.
9package main
10
11import (
12 "bytes"
13 "fmt"
14 "io/ioutil"
15 "log"
16 "os"
17 "strings"
18)
19
20func main() {
21 in1, err := ioutil.ReadFile("syscall_darwin.go")
22 if err != nil {
23 log.Fatalf("can't open syscall_darwin.go: %s", err)
24 }
25 arch := os.Args[1]
26 in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch))
27 if err != nil {
28 log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err)
29 }
30 in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch))
31 if err != nil {
32 log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err)
33 }
34 in := string(in1) + string(in2) + string(in3)
35
36 trampolines := map[string]bool{}
37
38 var out bytes.Buffer
39
40 fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " "))
41 fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
42 fmt.Fprintf(&out, "\n")
43 fmt.Fprintf(&out, "// +build go1.12\n")
44 fmt.Fprintf(&out, "\n")
45 fmt.Fprintf(&out, "#include \"textflag.h\"\n")
46 for _, line := range strings.Split(in, "\n") {
47 if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
48 continue
49 }
50 fn := line[5 : len(line)-13]
51 if !trampolines[fn] {
52 trampolines[fn] = true
53 fmt.Fprintf(&out, "TEXT ยท%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
54 fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
55 }
56 }
57 err = ioutil.WriteFile(fmt.Sprintf("zsyscall_darwin_%s.s", arch), out.Bytes(), 0644)
58 if err != nil {
59 log.Fatalf("can't write zsyscall_darwin_%s.s: %s", arch, err)
60 }
61}