1 // 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.
7 // mkasm_darwin.go generates assembly trampolines to call libSystem routines from Go.
8 //This program must be run after mksyscall.go.
20 func writeASMFile(in string, fileName string, buildTags string) {
21 trampolines := map[string]bool{}
25 fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " "))
26 fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
27 fmt.Fprintf(&out, "\n")
28 fmt.Fprintf(&out, "// +build %s\n", buildTags)
29 fmt.Fprintf(&out, "\n")
30 fmt.Fprintf(&out, "#include \"textflag.h\"\n")
31 for _, line := range strings.Split(in, "\n") {
32 if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
35 fn := line[5 : len(line)-13]
37 trampolines[fn] = true
38 fmt.Fprintf(&out, "TEXT ยท%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
39 fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
42 err := ioutil.WriteFile(fileName, out.Bytes(), 0644)
44 log.Fatalf("can't write %s: %s", fileName, err)
49 in1, err := ioutil.ReadFile("syscall_darwin.go")
51 log.Fatalf("can't open syscall_darwin.go: %s", err)
54 in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch))
56 log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err)
58 in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch))
60 log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err)
62 in := string(in1) + string(in2) + string(in3)
64 writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.s", arch), "go1.12")
66 in1, err = ioutil.ReadFile("syscall_darwin.1_13.go")
68 log.Fatalf("can't open syscall_darwin.1_13.go: %s", err)
70 in2, err = ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.1_13.go", arch))
72 log.Fatalf("can't open zsyscall_darwin_%s.1_13.go: %s", arch, err)
75 in = string(in1) + string(in2)
77 writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.1_13.s", arch), "go1.13")