Holger Hildebrandt | 0f9b88d | 2020-04-20 13:33:25 +0000 | [diff] [blame^] | 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. |
| 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. |
| 9 | package main |
| 10 | |
| 11 | import ( |
| 12 | "bytes" |
| 13 | "fmt" |
| 14 | "io/ioutil" |
| 15 | "log" |
| 16 | "os" |
| 17 | "strings" |
| 18 | ) |
| 19 | |
| 20 | func writeASMFile(in string, fileName string, buildTags string) { |
| 21 | trampolines := map[string]bool{} |
| 22 | |
| 23 | var out bytes.Buffer |
| 24 | |
| 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()") { |
| 33 | continue |
| 34 | } |
| 35 | fn := line[5 : len(line)-13] |
| 36 | if !trampolines[fn] { |
| 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) |
| 40 | } |
| 41 | } |
| 42 | err := ioutil.WriteFile(fileName, out.Bytes(), 0644) |
| 43 | if err != nil { |
| 44 | log.Fatalf("can't write %s: %s", fileName, err) |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | func main() { |
| 49 | in1, err := ioutil.ReadFile("syscall_darwin.go") |
| 50 | if err != nil { |
| 51 | log.Fatalf("can't open syscall_darwin.go: %s", err) |
| 52 | } |
| 53 | arch := os.Args[1] |
| 54 | in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch)) |
| 55 | if err != nil { |
| 56 | log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err) |
| 57 | } |
| 58 | in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch)) |
| 59 | if err != nil { |
| 60 | log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err) |
| 61 | } |
| 62 | in := string(in1) + string(in2) + string(in3) |
| 63 | |
| 64 | writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.s", arch), "go1.12") |
| 65 | |
| 66 | in1, err = ioutil.ReadFile("syscall_darwin.1_13.go") |
| 67 | if err != nil { |
| 68 | log.Fatalf("can't open syscall_darwin.1_13.go: %s", err) |
| 69 | } |
| 70 | in2, err = ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.1_13.go", arch)) |
| 71 | if err != nil { |
| 72 | log.Fatalf("can't open zsyscall_darwin_%s.1_13.go: %s", arch, err) |
| 73 | } |
| 74 | |
| 75 | in = string(in1) + string(in2) |
| 76 | |
| 77 | writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.1_13.s", arch), "go1.13") |
| 78 | } |