| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| //go:build ignore |
| // +build ignore |
| |
| // mkasm_darwin.go generates assembly trampolines to call libSystem routines from Go. |
| // This program must be run after mksyscall.go. |
| package main |
| |
| import ( |
| "bytes" |
| "fmt" |
| "io/ioutil" |
| "log" |
| "os" |
| "sort" |
| "strings" |
| ) |
| |
| const ptrsize = 8 // Pointer size. All supported platforms are 64-bit. |
| |
| func writeASMFile(in string, fileName string, buildTags string) map[string]bool { |
| trampolines := map[string]bool{} |
| |
| var out bytes.Buffer |
| |
| fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " ")) |
| fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n") |
| fmt.Fprintf(&out, "\n") |
| fmt.Fprintf(&out, "//go:build %s\n", buildTags) |
| fmt.Fprintf(&out, "// +build %s\n", buildTags) |
| fmt.Fprintf(&out, "\n") |
| fmt.Fprintf(&out, "#include \"textflag.h\"\n") |
| for _, line := range strings.Split(in, "\n") { |
| const prefix = "var " |
| const suffix = "_trampoline_addr uintptr" |
| if !strings.HasPrefix(line, prefix) || !strings.HasSuffix(line, suffix) { |
| continue |
| } |
| fn := strings.TrimSuffix(strings.TrimPrefix(line, prefix), suffix) |
| if !trampolines[fn] { |
| trampolines[fn] = true |
| fmt.Fprintf(&out, "\nTEXT %s_trampoline<>(SB),NOSPLIT,$0-0\n", fn) |
| fmt.Fprintf(&out, "\tJMP\t%s(SB)\n\n", fn) |
| fmt.Fprintf(&out, "GLOBL\t·%s_trampoline_addr(SB), RODATA, $%d\n", fn, ptrsize) |
| fmt.Fprintf(&out, "DATA\t·%s_trampoline_addr(SB)/%d, $%s_trampoline<>(SB)\n", fn, ptrsize, fn) |
| } |
| } |
| err := ioutil.WriteFile(fileName, out.Bytes(), 0644) |
| if err != nil { |
| log.Fatalf("can't write %s: %s", fileName, err) |
| } |
| |
| return trampolines |
| } |
| |
| const darwinTestTemplate = `// go run mkasm_darwin.go %s |
| // Code generated by the command above; DO NOT EDIT. |
| |
| //go:build darwin && go1.12 |
| // +build darwin,go1.12 |
| |
| package unix |
| |
| // All the _trampoline functions in zsyscall_darwin_%s.s. |
| var darwinTests = [...]darwinTest{ |
| %s} |
| ` |
| |
| func writeDarwinTest(trampolines map[string]bool, fileName, arch string) { |
| // sort trampolines |
| sorted := make([]string, len(trampolines)) |
| i := 0 |
| for trampoline := range trampolines { |
| sorted[i] = trampoline |
| i++ |
| } |
| sort.Slice(sorted, func(i, j int) bool { return sorted[i] < sorted[j] }) |
| |
| var out bytes.Buffer |
| |
| const prefix = "libc_" |
| for _, trampoline := range sorted { |
| fmt.Fprintf(&out, fmt.Sprintf("\t{%q, %s_trampoline_addr},\n", strings.TrimPrefix(trampoline, prefix), trampoline)) |
| } |
| lines := out.String() |
| |
| out.Reset() |
| fmt.Fprintf(&out, darwinTestTemplate, strings.Join(os.Args[1:], " "), arch, lines) |
| |
| err := ioutil.WriteFile(fileName, out.Bytes(), 0644) |
| if err != nil { |
| log.Fatalf("can't write %s: %s", fileName, err) |
| } |
| } |
| |
| func main() { |
| in1, err := ioutil.ReadFile("syscall_darwin.go") |
| if err != nil { |
| log.Fatalf("can't open syscall_darwin.go: %s", err) |
| } |
| arch := os.Args[1] |
| in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch)) |
| if err != nil { |
| log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err) |
| } |
| in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch)) |
| if err != nil { |
| log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err) |
| } |
| in := string(in1) + string(in2) + string(in3) |
| |
| trampolines := writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.s", arch), "go1.12") |
| |
| in1, err = ioutil.ReadFile("syscall_darwin.1_13.go") |
| if err != nil { |
| log.Fatalf("can't open syscall_darwin.1_13.go: %s", err) |
| } |
| in2, err = ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.1_13.go", arch)) |
| if err != nil { |
| log.Fatalf("can't open zsyscall_darwin_%s.1_13.go: %s", arch, err) |
| } |
| |
| in = string(in1) + string(in2) |
| |
| trampolines2 := writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.1_13.s", arch), "go1.13") |
| |
| // merge trampolines |
| for trampoline := range trampolines2 { |
| trampolines[trampoline] = true |
| } |
| |
| writeDarwinTest(trampolines, fmt.Sprintf("darwin_%s_test.go", arch), arch) |
| } |