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Diffstat (limited to '')
-rw-r--r-- | dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/mkasm.go | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/mkasm.go b/dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/mkasm.go new file mode 100644 index 0000000..8c9d27d --- /dev/null +++ b/dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/mkasm.go @@ -0,0 +1,140 @@ +// 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.go generates assembly trampolines to call library routines from Go. +// This program must be run after mksyscall.go. +package main + +import ( + "bytes" + "fmt" + "io/ioutil" + "log" + "os" + "sort" + "strings" +) + +func archPtrSize(arch string) int { + switch arch { + case "386", "arm": + return 4 + case "amd64", "arm64", "mips64", "ppc64", "riscv64": + return 8 + default: + log.Fatalf("Unknown arch %q", arch) + return 0 + } +} + +func generateASMFile(goos, arch string, inFileNames []string, outFileName string) map[string]bool { + trampolines := map[string]bool{} + var orderedTrampolines []string + for _, inFileName := range inFileNames { + in, err := ioutil.ReadFile(inFileName) + if err != nil { + log.Fatalf("Failed to read file: %v", err) + } + for _, line := range strings.Split(string(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] { + orderedTrampolines = append(orderedTrampolines, fn) + trampolines[fn] = true + } + } + } + + ptrSize := archPtrSize(arch) + + var out bytes.Buffer + fmt.Fprintf(&out, "// go run mkasm.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, "#include \"textflag.h\"\n") + for _, fn := range orderedTrampolines { + fmt.Fprintf(&out, "\nTEXT %s_trampoline<>(SB),NOSPLIT,$0-0\n", fn) + if goos == "openbsd" && arch == "ppc64" { + fmt.Fprintf(&out, "\tCALL\t%s(SB)\n", fn) + fmt.Fprintf(&out, "\tRET\n") + } else { + fmt.Fprintf(&out, "\tJMP\t%s(SB)\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) + } + + if err := ioutil.WriteFile(outFileName, out.Bytes(), 0644); err != nil { + log.Fatalf("Failed to write assembly file %q: %v", outFileName, err) + } + + return trampolines +} + +const darwinTestTemplate = `// go run mkasm.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) { + var sortedTrampolines []string + for fn := range trampolines { + sortedTrampolines = append(sortedTrampolines, fn) + } + sort.Strings(sortedTrampolines) + + var out bytes.Buffer + + const prefix = "libc_" + for _, fn := range sortedTrampolines { + fmt.Fprintf(&out, fmt.Sprintf("\t{%q, %s_trampoline_addr},\n", strings.TrimPrefix(fn, prefix), fn)) + } + lines := out.String() + + out.Reset() + fmt.Fprintf(&out, darwinTestTemplate, strings.Join(os.Args[1:], " "), arch, lines) + + if err := ioutil.WriteFile(fileName, out.Bytes(), 0644); err != nil { + log.Fatalf("Failed to write test file %q: %v", fileName, err) + } +} + +func main() { + if len(os.Args) != 3 { + log.Fatalf("Usage: %s <goos> <arch>", os.Args[0]) + } + goos, arch := os.Args[1], os.Args[2] + + syscallFilename := fmt.Sprintf("syscall_%s.go", goos) + syscallArchFilename := fmt.Sprintf("syscall_%s_%s.go", goos, arch) + zsyscallArchFilename := fmt.Sprintf("zsyscall_%s_%s.go", goos, arch) + zsyscallASMFileName := fmt.Sprintf("zsyscall_%s_%s.s", goos, arch) + + inFileNames := []string{ + syscallFilename, + syscallArchFilename, + zsyscallArchFilename, + } + + trampolines := generateASMFile(goos, arch, inFileNames, zsyscallASMFileName) + + if goos == "darwin" { + writeDarwinTest(trampolines, fmt.Sprintf("darwin_%s_test.go", arch), arch) + } +} |