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// 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)
}
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