unix: replace "mksyscall_aix_ppc64.pl" script with a Go program

Port mksyscall_aix_ppc64.pl Perl script to mksyscall_aix_ppc64.go.
mkall.sh script is modified to run mksyscall.go. Running
mkall.sh does not generate any git diff besides the command
name in comments of generated files.

Updates golang/go#27779

Change-Id: Ie888c0df470dcfc75034faa12cf3422b2d426629
Reviewed-on: https://go-review.googlesource.com/c/158699
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

unix/mkall.sh

@@ -67,7 +67,7 @@ aix_ppc)
 	;;
 aix_ppc64)
 	mkerrors="$mkerrors -maix64"
-	mksyscall="./mksyscall_aix_ppc64.pl -aix"
+	mksyscall="go run mksyscall_aix_ppc64.go -aix"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 darwin_386)

unix/mksyscall_aix_ppc64.go

@@ -0,0 +1,602 @@
+// Copyright 2019 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.
+
+// +build ignore
+
+/*
+This program reads a file containing function prototypes
+(like syscall_aix.go) and generates system call bodies.
+The prototypes are marked by lines beginning with "//sys"
+and read like func declarations if //sys is replaced by func, but:
+	* The parameter lists must give a name for each argument.
+	  This includes return parameters.
+	* The parameter lists must give a type for each argument:
+	  the (x, y, z int) shorthand is not allowed.
+	* If the return parameter is an error number, it must be named err.
+	* If go func name needs to be different than its libc name,
+	* or the function is not in libc, name could be specified
+	* at the end, after "=" sign, like
+	  //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt
+
+
+This program will generate three files and handle both gc and gccgo implementation:
+  - zsyscall_aix_ppc64.go: the common part of each implementation (error handler, pointer creation)
+  - zsyscall_aix_ppc64_gc.go: gc part with //go_cgo_import_dynamic and a call to syscall6
+  - zsyscall_aix_ppc64_gccgo.go: gccgo part with C function and conversion to C type.
+
+ The generated code looks like this
+
+zsyscall_aix_ppc64.go
+func asyscall(...) (n int, err error) {
+	 // Pointer Creation
+	 r1, e1 := callasyscall(...)
+	 // Type Conversion
+	 // Error Handler
+	 return
+}
+
+zsyscall_aix_ppc64_gc.go
+//go:cgo_import_dynamic libc_asyscall asyscall "libc.a/shr_64.o"
+//go:linkname libc_asyscall libc_asyscall
+var asyscall syscallFunc
+
+func callasyscall(...) (r1 uintptr, e1 Errno) {
+	 r1, _, e1 = syscall6(uintptr(unsafe.Pointer(&libc_asyscall)), "nb_args", ... )
+	 return
+}
+
+zsyscall_aix_ppc64_ggcgo.go
+
+// int asyscall(...)
+
+import "C"
+
+func callasyscall(...) (r1 uintptr, e1 Errno) {
+	 r1 = uintptr(C.asyscall(...))
+	 e1 = syscall.GetErrno()
+	 return
+}
+*/
+
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"regexp"
+	"strings"
+)
+
+var (
+	b32  = flag.Bool("b32", false, "32bit big-endian")
+	l32  = flag.Bool("l32", false, "32bit little-endian")
+	aix  = flag.Bool("aix", false, "aix")
+	tags = flag.String("tags", "", "build tags")
+)
+
+// cmdLine returns this programs's commandline arguments
+func cmdLine() string {
+	return "go run mksyscall_aix_ppc64.go " + strings.Join(os.Args[1:], " ")
+}
+
+// buildTags returns build tags
+func buildTags() string {
+	return *tags
+}
+
+// Param is function parameter
+type Param struct {
+	Name string
+	Type string
+}
+
+// usage prints the program usage
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: go run mksyscall_aix_ppc64.go [-b32 | -l32] [-tags x,y] [file ...]\n")
+	os.Exit(1)
+}
+
+// parseParamList parses parameter list and returns a slice of parameters
+func parseParamList(list string) []string {
+	list = strings.TrimSpace(list)
+	if list == "" {
+		return []string{}
+	}
+	return regexp.MustCompile(`\s*,\s*`).Split(list, -1)
+}
+
+// parseParam splits a parameter into name and type
+func parseParam(p string) Param {
+	ps := regexp.MustCompile(`^(\S*) (\S*)$`).FindStringSubmatch(p)
+	if ps == nil {
+		fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p)
+		os.Exit(1)
+	}
+	return Param{ps[1], ps[2]}
+}
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+	if len(flag.Args()) <= 0 {
+		fmt.Fprintf(os.Stderr, "no files to parse provided\n")
+		usage()
+	}
+
+	endianness := ""
+	if *b32 {
+		endianness = "big-endian"
+	} else if *l32 {
+		endianness = "little-endian"
+	}
+
+	pack := ""
+	// GCCGO
+	textgccgo := ""
+	cExtern := "/*\n#include <stdint.h>\n"
+	// GC
+	textgc := ""
+	dynimports := ""
+	linknames := ""
+	var vars []string
+	// COMMON
+	textcommon := ""
+	for _, path := range flag.Args() {
+		file, err := os.Open(path)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, err.Error())
+			os.Exit(1)
+		}
+		s := bufio.NewScanner(file)
+		for s.Scan() {
+			t := s.Text()
+			t = strings.TrimSpace(t)
+			t = regexp.MustCompile(`\s+`).ReplaceAllString(t, ` `)
+			if p := regexp.MustCompile(`^package (\S+)$`).FindStringSubmatch(t); p != nil && pack == "" {
+				pack = p[1]
+			}
+			nonblock := regexp.MustCompile(`^\/\/sysnb `).FindStringSubmatch(t)
+			if regexp.MustCompile(`^\/\/sys `).FindStringSubmatch(t) == nil && nonblock == nil {
+				continue
+			}
+
+			// Line must be of the form
+			//	func Open(path string, mode int, perm int) (fd int, err error)
+			// Split into name, in params, out params.
+			f := regexp.MustCompile(`^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$`).FindStringSubmatch(t)
+			if f == nil {
+				fmt.Fprintf(os.Stderr, "%s:%s\nmalformed //sys declaration\n", path, t)
+				os.Exit(1)
+			}
+			funct, inps, outps, modname, sysname := f[2], f[3], f[4], f[5], f[6]
+
+			// Split argument lists on comma.
+			in := parseParamList(inps)
+			out := parseParamList(outps)
+
+			inps = strings.Join(in, ", ")
+			outps = strings.Join(out, ", ")
+
+			if sysname == "" {
+				sysname = funct
+			}
+
+			onlyCommon := false
+			if funct == "readlen" || funct == "writelen" || funct == "FcntlInt" || funct == "FcntlFlock" {
+				// This function call another syscall which is already implemented.
+				// Therefore, the gc and gccgo part must not be generated.
+				onlyCommon = true
+			}
+
+			// Try in vain to keep people from editing this file.
+			// The theory is that they jump into the middle of the file
+			// without reading the header.
+
+			textcommon += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
+			if !onlyCommon {
+				textgccgo += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
+				textgc += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
+			}
+
+			// Check if value return, err return available
+			errvar := ""
+			rettype := ""
+			for _, param := range out {
+				p := parseParam(param)
+				if p.Type == "error" {
+					errvar = p.Name
+				} else {
+					rettype = p.Type
+				}
+			}
+
+			sysname = regexp.MustCompile(`([a-z])([A-Z])`).ReplaceAllString(sysname, `${1}_$2`)
+			sysname = strings.ToLower(sysname) // All libc functions are lowercase.
+
+			// GCCGO Prototype return type
+			cRettype := ""
+			if rettype == "unsafe.Pointer" {
+				cRettype = "uintptr_t"
+			} else if rettype == "uintptr" {
+				cRettype = "uintptr_t"
+			} else if regexp.MustCompile(`^_`).FindStringSubmatch(rettype) != nil {
+				cRettype = "uintptr_t"
+			} else if rettype == "int" {
+				cRettype = "int"
+			} else if rettype == "int32" {
+				cRettype = "int"
+			} else if rettype == "int64" {
+				cRettype = "long long"
+			} else if rettype == "uint32" {
+				cRettype = "unsigned int"
+			} else if rettype == "uint64" {
+				cRettype = "unsigned long long"
+			} else {
+				cRettype = "int"
+			}
+			if sysname == "exit" {
+				cRettype = "void"
+			}
+
+			// GCCGO Prototype arguments type
+			var cIn []string
+			for i, param := range in {
+				p := parseParam(param)
+				if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
+					cIn = append(cIn, "uintptr_t")
+				} else if p.Type == "string" {
+					cIn = append(cIn, "uintptr_t")
+				} else if regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type) != nil {
+					cIn = append(cIn, "uintptr_t", "size_t")
+				} else if p.Type == "unsafe.Pointer" {
+					cIn = append(cIn, "uintptr_t")
+				} else if p.Type == "uintptr" {
+					cIn = append(cIn, "uintptr_t")
+				} else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil {
+					cIn = append(cIn, "uintptr_t")
+				} else if p.Type == "int" {
+					if (i == 0 || i == 2) && funct == "fcntl" {
+						// These fcntl arguments needs to be uintptr to be able to call FcntlInt and FcntlFlock
+						cIn = append(cIn, "uintptr_t")
+					} else {
+						cIn = append(cIn, "int")
+					}
+
+				} else if p.Type == "int32" {
+					cIn = append(cIn, "int")
+				} else if p.Type == "int64" {
+					cIn = append(cIn, "long long")
+				} else if p.Type == "uint32" {
+					cIn = append(cIn, "unsigned int")
+				} else if p.Type == "uint64" {
+					cIn = append(cIn, "unsigned long long")
+				} else {
+					cIn = append(cIn, "int")
+				}
+			}
+
+			if !onlyCommon {
+				// GCCGO Prototype Generation
+				// Imports of system calls from libc
+				cExtern += fmt.Sprintf("%s %s", cRettype, sysname)
+				cIn := strings.Join(cIn, ", ")
+				cExtern += fmt.Sprintf("(%s);\n", cIn)
+			}
+			// GC Library name
+			if modname == "" {
+				modname = "libc.a/shr_64.o"
+			} else {
+				fmt.Fprintf(os.Stderr, "%s: only syscall using libc are available\n", funct)
+				os.Exit(1)
+			}
+			sysvarname := fmt.Sprintf("libc_%s", sysname)
+
+			if !onlyCommon {
+				// GC Runtime import of function to allow cross-platform builds.
+				dynimports += fmt.Sprintf("//go:cgo_import_dynamic %s %s \"%s\"\n", sysvarname, sysname, modname)
+				// GC Link symbol to proc address variable.
+				linknames += fmt.Sprintf("//go:linkname %s %s\n", sysvarname, sysvarname)
+				// GC Library proc address variable.
+				vars = append(vars, sysvarname)
+			}
+
+			strconvfunc := "BytePtrFromString"
+			strconvtype := "*byte"
+
+			// Go function header.
+			if outps != "" {
+				outps = fmt.Sprintf(" (%s)", outps)
+			}
+			if textcommon != "" {
+				textcommon += "\n"
+			}
+
+			textcommon += fmt.Sprintf("func %s(%s)%s {\n", funct, strings.Join(in, ", "), outps)
+
+			// Prepare arguments tocall.
+			var argscommon []string // Arguments in the common part
+			var argscall []string   // Arguments for call prototype
+			var argsgc []string     // Arguments for gc call (with syscall6)
+			var argsgccgo []string  // Arguments for gccgo call (with C.name_of_syscall)
+			n := 0
+			argN := 0
+			for _, param := range in {
+				p := parseParam(param)
+				if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
+					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(%s))", p.Name))
+					argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
+					argsgc = append(argsgc, p.Name)
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+				} else if p.Type == "string" && errvar != "" {
+					textcommon += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype)
+					textcommon += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name)
+					textcommon += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar)
+
+					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n))
+					argscall = append(argscall, fmt.Sprintf("_p%d uintptr ", n))
+					argsgc = append(argsgc, fmt.Sprintf("_p%d", n))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n))
+					n++
+				} else if p.Type == "string" {
+					fmt.Fprintf(os.Stderr, path+":"+funct+" uses string arguments, but has no error return\n")
+					textcommon += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype)
+					textcommon += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name)
+					textcommon += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar)
+
+					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n))
+					argscall = append(argscall, fmt.Sprintf("_p%d uintptr", n))
+					argsgc = append(argsgc, fmt.Sprintf("_p%d", n))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n))
+					n++
+				} else if m := regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type); m != nil {
+					// Convert slice into pointer, length.
+					// Have to be careful not to take address of &a[0] if len == 0:
+					// pass nil in that case.
+					textcommon += fmt.Sprintf("\tvar _p%d *%s\n", n, m[1])
+					textcommon += fmt.Sprintf("\tif len(%s) > 0 {\n\t\t_p%d = &%s[0]\n\t}\n", p.Name, n, p.Name)
+					argscommon = append(argscommon, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n), fmt.Sprintf("len(%s)", p.Name))
+					argscall = append(argscall, fmt.Sprintf("_p%d uintptr", n), fmt.Sprintf("_lenp%d int", n))
+					argsgc = append(argsgc, fmt.Sprintf("_p%d", n), fmt.Sprintf("uintptr(_lenp%d)", n))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(_p%d)", n), fmt.Sprintf("C.size_t(_lenp%d)", n))
+					n++
+				} else if p.Type == "int64" && endianness != "" {
+					fmt.Fprintf(os.Stderr, path+":"+funct+" uses int64 with 32 bits mode. Case not yet implemented\n")
+				} else if p.Type == "bool" {
+					fmt.Fprintf(os.Stderr, path+":"+funct+" uses bool. Case not yet implemented\n")
+				} else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil || p.Type == "unsafe.Pointer" {
+					argscommon = append(argscommon, fmt.Sprintf("uintptr(%s)", p.Name))
+					argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
+					argsgc = append(argsgc, p.Name)
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+				} else if p.Type == "int" {
+					if (argN == 0 || argN == 2) && ((funct == "fcntl") || (funct == "FcntlInt") || (funct == "FcntlFlock")) {
+						// These fcntl arguments need to be uintptr to be able to call FcntlInt and FcntlFlock
+						argscommon = append(argscommon, fmt.Sprintf("uintptr(%s)", p.Name))
+						argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
+						argsgc = append(argsgc, p.Name)
+						argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+
+					} else {
+						argscommon = append(argscommon, p.Name)
+						argscall = append(argscall, fmt.Sprintf("%s int", p.Name))
+						argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
+						argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
+					}
+				} else if p.Type == "int32" {
+					argscommon = append(argscommon, p.Name)
+					argscall = append(argscall, fmt.Sprintf("%s int32", p.Name))
+					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
+				} else if p.Type == "int64" {
+					argscommon = append(argscommon, p.Name)
+					argscall = append(argscall, fmt.Sprintf("%s int64", p.Name))
+					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.longlong(%s)", p.Name))
+				} else if p.Type == "uint32" {
+					argscommon = append(argscommon, p.Name)
+					argscall = append(argscall, fmt.Sprintf("%s uint32", p.Name))
+					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uint(%s)", p.Name))
+				} else if p.Type == "uint64" {
+					argscommon = append(argscommon, p.Name)
+					argscall = append(argscall, fmt.Sprintf("%s uint64", p.Name))
+					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.ulonglong(%s)", p.Name))
+				} else if p.Type == "uintptr" {
+					argscommon = append(argscommon, p.Name)
+					argscall = append(argscall, fmt.Sprintf("%s uintptr", p.Name))
+					argsgc = append(argsgc, p.Name)
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+				} else {
+					argscommon = append(argscommon, fmt.Sprintf("int(%s)", p.Name))
+					argscall = append(argscall, fmt.Sprintf("%s int", p.Name))
+					argsgc = append(argsgc, fmt.Sprintf("uintptr(%s)", p.Name))
+					argsgccgo = append(argsgccgo, fmt.Sprintf("C.int(%s)", p.Name))
+				}
+				argN++
+			}
+			nargs := len(argsgc)
+
+			// COMMON function generation
+			argscommonlist := strings.Join(argscommon, ", ")
+			callcommon := fmt.Sprintf("call%s(%s)", sysname, argscommonlist)
+			ret := []string{"_", "_"}
+			body := ""
+			doErrno := false
+			for i := 0; i < len(out); i++ {
+				p := parseParam(out[i])
+				reg := ""
+				if p.Name == "err" {
+					reg = "e1"
+					ret[1] = reg
+					doErrno = true
+				} else {
+					reg = "r0"
+					ret[0] = reg
+				}
+				if p.Type == "bool" {
+					reg = fmt.Sprintf("%s != 0", reg)
+				}
+				if reg != "e1" {
+					body += fmt.Sprintf("\t%s = %s(%s)\n", p.Name, p.Type, reg)
+				}
+			}
+			if ret[0] == "_" && ret[1] == "_" {
+				textcommon += fmt.Sprintf("\t%s\n", callcommon)
+			} else {
+				textcommon += fmt.Sprintf("\t%s, %s := %s\n", ret[0], ret[1], callcommon)
+			}
+			textcommon += body
+
+			if doErrno {
+				textcommon += "\tif e1 != 0 {\n"
+				textcommon += "\t\terr = errnoErr(e1)\n"
+				textcommon += "\t}\n"
+			}
+			textcommon += "\treturn\n"
+			textcommon += "}\n"
+
+			if onlyCommon {
+				continue
+			}
+
+			// CALL Prototype
+			callProto := fmt.Sprintf("func call%s(%s) (r1 uintptr, e1 Errno) {\n", sysname, strings.Join(argscall, ", "))
+
+			// GC function generation
+			asm := "syscall6"
+			if nonblock != nil {
+				asm = "rawSyscall6"
+			}
+
+			if len(argsgc) <= 6 {
+				for len(argsgc) < 6 {
+					argsgc = append(argsgc, "0")
+				}
+			} else {
+				fmt.Fprintf(os.Stderr, "%s: too many arguments to system call", funct)
+				os.Exit(1)
+			}
+			argsgclist := strings.Join(argsgc, ", ")
+			callgc := fmt.Sprintf("%s(uintptr(unsafe.Pointer(&%s)), %d, %s)", asm, sysvarname, nargs, argsgclist)
+
+			textgc += callProto
+			textgc += fmt.Sprintf("\tr1, _, e1 = %s\n", callgc)
+			textgc += "\treturn\n}\n"
+
+			// GCCGO function generation
+			argsgccgolist := strings.Join(argsgccgo, ", ")
+			callgccgo := fmt.Sprintf("C.%s(%s)", sysname, argsgccgolist)
+			textgccgo += callProto
+			textgccgo += fmt.Sprintf("\tr1 = uintptr(%s)\n", callgccgo)
+			textgccgo += "\te1 = syscall.GetErrno()\n"
+			textgccgo += "\treturn\n}\n"
+		}
+		if err := s.Err(); err != nil {
+			fmt.Fprintf(os.Stderr, err.Error())
+			os.Exit(1)
+		}
+		file.Close()
+	}
+	imp := ""
+	if pack != "unix" {
+		imp = "import \"golang.org/x/sys/unix\"\n"
+
+	}
+
+	// Print zsyscall_aix_ppc64.go
+	err := ioutil.WriteFile("zsyscall_aix_ppc64.go",
+		[]byte(fmt.Sprintf(srcTemplate1, cmdLine(), buildTags(), pack, imp, textcommon)),
+		0644)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, err.Error())
+		os.Exit(1)
+	}
+
+	// Print zsyscall_aix_ppc64_gc.go
+	vardecls := "\t" + strings.Join(vars, ",\n\t")
+	vardecls += " syscallFunc"
+	err = ioutil.WriteFile("zsyscall_aix_ppc64_gc.go",
+		[]byte(fmt.Sprintf(srcTemplate2, cmdLine(), buildTags(), pack, imp, dynimports, linknames, vardecls, textgc)),
+		0644)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, err.Error())
+		os.Exit(1)
+	}
+
+	// Print zsyscall_aix_ppc64_gccgo.go
+	err = ioutil.WriteFile("zsyscall_aix_ppc64_gccgo.go",
+		[]byte(fmt.Sprintf(srcTemplate3, cmdLine(), buildTags(), pack, cExtern, imp, textgccgo)),
+		0644)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, err.Error())
+		os.Exit(1)
+	}
+}
+
+const srcTemplate1 = `// %s
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
+// +build %s
+
+package %s
+
+import (
+	"unsafe"
+)
+
+
+%s
+
+%s
+`
+const srcTemplate2 = `// %s
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
+// +build %s
+// +build !gccgo
+
+package %s
+
+import (
+	"unsafe"
+)
+%s
+%s
+%s
+type syscallFunc uintptr
+
+var (
+%s
+)
+
+// Implemented in runtime/syscall_aix.go.
+func rawSyscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
+func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
+
+%s
+`
+const srcTemplate3 = `// %s
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
+// +build %s
+// +build gccgo
+
+package %s
+
+%s
+*/
+import "C"
+import (
+	"syscall"
+)
+
+
+%s
+
+%s
+`

unix/mksyscall_aix_ppc64.pl

@@ -1,579 +0,0 @@
-#!/usr/bin/env perl
-# 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.
-
-# This program reads a file containing function prototypes
-# (like syscall_aix.go) and generates system call bodies.
-# The prototypes are marked by lines beginning with "//sys"
-# and read like func declarations if //sys is replaced by func, but:
-#	* The parameter lists must give a name for each argument.
-#	  This includes return parameters.
-#	* The parameter lists must give a type for each argument:
-#	  the (x, y, z int) shorthand is not allowed.
-#	* If the return parameter is an error number, it must be named err.
-#	* If go func name needs to be different than its libc name,
-#	* or the function is not in libc, name could be specified
-#	* at the end, after "=" sign, like
-#	  //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt
-
-# This program will generate three files and handle both gc and gccgo implementation:
-#   - zsyscall_aix_ppc64.go: the common part of each implementation (error handler, pointer creation)
-#   - zsyscall_aix_ppc64_gc.go: gc part with //go_cgo_import_dynamic and a call to syscall6
-#   - zsyscall_aix_ppc64_gccgo.go: gccgo part with C function and conversion to C type.
-
-# The generated code looks like this
-#
-# zsyscall_aix_ppc64.go
-# func asyscall(...) (n int, err error) {
-#	  // Pointer Creation
-#	  r1, e1 := callasyscall(...)
-#	  // Type Conversion
-#	  // Error Handler
-#	  return
-# }
-#
-# zsyscall_aix_ppc64_gc.go
-# //go:cgo_import_dynamic libc_asyscall asyscall "libc.a/shr_64.o"
-# //go:linkname libc_asyscall libc_asyscall
-# var asyscall syscallFunc
-#
-# func callasyscall(...) (r1 uintptr, e1 Errno) {
-#	  r1, _, e1 = syscall6(uintptr(unsafe.Pointer(&libc_asyscall)), "nb_args", ... )
-#	  return
-# }
-#
-# zsyscall_aix_ppc64_ggcgo.go
-# /*
-#  int asyscall(...)
-#
-# */
-# import "C"
-#
-# func callasyscall(...) (r1 uintptr, e1 Errno) {
-#	  r1 = uintptr(C.asyscall(...))
-#	  e1 = syscall.GetErrno()
-#	  return
-# }
-
-
-
-use strict;
-
-my $cmdline = "mksyscall_aix_ppc64.pl " . join(' ', @ARGV);
-my $errors = 0;
-my $_32bit = "";
-my $tags = "";  # build tags
-my $aix = 0;
-my $solaris = 0;
-
-binmode STDOUT;
-
-if($ARGV[0] eq "-b32") {
-	$_32bit = "big-endian";
-	shift;
-} elsif($ARGV[0] eq "-l32") {
-	$_32bit = "little-endian";
-	shift;
-}
-if($ARGV[0] eq "-aix") {
-	$aix = 1;
-	shift;
-}
-if($ARGV[0] eq "-tags") {
-	shift;
-	$tags = $ARGV[0];
-	shift;
-}
-
-if($ARGV[0] =~ /^-/) {
-	print STDERR "usage: mksyscall_aix.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
-	exit 1;
-}
-
-sub parseparamlist($) {
-	my ($list) = @_;
-	$list =~ s/^\s*//;
-	$list =~ s/\s*$//;
-	if($list eq "") {
-		return ();
-	}
-	return split(/\s*,\s*/, $list);
-}
-
-sub parseparam($) {
-	my ($p) = @_;
-	if($p !~ /^(\S*) (\S*)$/) {
-		print STDERR "$ARGV:$.: malformed parameter: $p\n";
-		$errors = 1;
-		return ("xx", "int");
-	}
-	return ($1, $2);
-}
-
-my $package = "";
-# GCCGO
-my $textgccgo = "";
-my $c_extern = "/*\n#include <stdint.h>\n";
-# GC
-my $textgc = "";
-my $dynimports = "";
-my $linknames = "";
-my @vars = ();
-# COMMUN
-my $textcommon = "";
-
-while(<>) {
-	chomp;
-	s/\s+/ /g;
-	s/^\s+//;
-	s/\s+$//;
-	$package = $1 if !$package && /^package (\S+)$/;
-	my $nonblock = /^\/\/sysnb /;
-	next if !/^\/\/sys / && !$nonblock;
-
-	# Line must be of the form
-	# func Open(path string, mode int, perm int) (fd int, err error)
-	# Split into name, in params, out params.
-	if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) {
-		print STDERR "$ARGV:$.: malformed //sys declaration\n";
-		$errors = 1;
-		next;
-	}
-	my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6);
-
-	# Split argument lists on comma.
-	my @in = parseparamlist($in);
-	my @out = parseparamlist($out);
-
-	$in = join(', ', @in);
-	$out = join(', ', @out);
-
-	if($sysname eq "") {
-		$sysname = "$func";
-	}
-
-	my $onlyCommon = 0;
-	if ($func eq "readlen" || $func eq "writelen" || $func eq "FcntlInt" || $func eq "FcntlFlock") {
-		# This function call another syscall which is already implemented.
-		# Therefore, the gc and gccgo part must not be generated.
-		$onlyCommon = 1
-	}
-
-	# Try in vain to keep people from editing this file.
-	# The theory is that they jump into the middle of the file
-	# without reading the header.
-
-	$textcommon .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
-	if (!$onlyCommon) {
-		$textgccgo .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
-		$textgc .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
-	}
-
-
-	# Check if value return, err return available
-	my $errvar = "";
-	my $retvar = "";
-	my $rettype = "";
-	foreach my $p (@out) {
-		my ($name, $type) = parseparam($p);
-		if($type eq "error") {
-			$errvar = $name;
-		} else {
-			$retvar = $name;
-			$rettype = $type;
-		}
-	}
-
-
-	$sysname =~ s/([a-z])([A-Z])/${1}_$2/g;
-	$sysname =~ y/A-Z/a-z/; # All libc functions are lowercase.
-
-	# GCCGO Prototype return type
-	my $C_rettype = "";
-	if($rettype eq "unsafe.Pointer") {
-		$C_rettype = "uintptr_t";
-	} elsif($rettype eq "uintptr") {
-		$C_rettype = "uintptr_t";
-	} elsif($rettype =~ /^_/) {
-		$C_rettype = "uintptr_t";
-	} elsif($rettype eq "int") {
-		$C_rettype = "int";
-	} elsif($rettype eq "int32") {
-		$C_rettype = "int";
-	} elsif($rettype eq "int64") {
-		$C_rettype = "long long";
-	} elsif($rettype eq "uint32") {
-		$C_rettype = "unsigned int";
-	} elsif($rettype eq "uint64") {
-		$C_rettype = "unsigned long long";
-	} else {
-		$C_rettype = "int";
-	}
-	if($sysname eq "exit") {
-		$C_rettype = "void";
-	}
-
-	# GCCGO Prototype arguments type
-	my @c_in = ();
-	foreach my $i (0 .. $#in) {
-		my ($name, $type) = parseparam($in[$i]);
-		if($type =~ /^\*/) {
-			push @c_in, "uintptr_t";
-			} elsif($type eq "string") {
-			push @c_in, "uintptr_t";
-		} elsif($type =~ /^\[\](.*)/) {
-			push @c_in, "uintptr_t", "size_t";
-		} elsif($type eq "unsafe.Pointer") {
-			push @c_in, "uintptr_t";
-		} elsif($type eq "uintptr") {
-			push @c_in, "uintptr_t";
-		} elsif($type =~ /^_/) {
-			push @c_in, "uintptr_t";
-		} elsif($type eq "int") {
-			if (($i == 0 || $i == 2) && $func eq "fcntl"){
-				# These fcntl arguments needs to be uintptr to be able to call FcntlInt and FcntlFlock
-				push @c_in, "uintptr_t";
-			} else {
-				push @c_in, "int";
-			}
-		} elsif($type eq "int32") {
-			push @c_in, "int";
-		} elsif($type eq "int64") {
-			push @c_in, "long long";
-		} elsif($type eq "uint32") {
-			push @c_in, "unsigned int";
-		} elsif($type eq "uint64") {
-			push @c_in, "unsigned long long";
-		} else {
-			push @c_in, "int";
-		}
-	}
-
-	if (!$onlyCommon){
-		# GCCGO Prototype Generation
-		# Imports of system calls from libc
-		$c_extern .= "$C_rettype $sysname";
-		my $c_in = join(', ', @c_in);
-		$c_extern .= "($c_in);\n";
-	}
-
-	# GC Library name
-	if($modname eq "") {
-		$modname = "libc.a/shr_64.o";
-	} else {
-		print STDERR "$func: only syscall using libc are available\n";
-		$errors = 1;
-		next;
-	}
-	my $sysvarname = "libc_${sysname}";
-
-	if (!$onlyCommon){
-		# GC Runtime import of function to allow cross-platform builds.
-		$dynimports .= "//go:cgo_import_dynamic ${sysvarname} ${sysname} \"$modname\"\n";
-		# GC Link symbol to proc address variable.
-		$linknames .= "//go:linkname ${sysvarname} ${sysvarname}\n";
-		# GC Library proc address variable.
-		push @vars, $sysvarname;
-	}
-
-	my $strconvfunc ="BytePtrFromString";
-	my $strconvtype = "*byte";
-
-	# Go function header.
-	if($out ne "") {
-		$out = " ($out)";
-	}
-	if($textcommon ne "") {
-		$textcommon .= "\n"
-	}
-
-	$textcommon .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out ;
-
-	# Prepare arguments to call.
-	my @argscommun = (); # Arguments in the commun part
-	my @argscall = ();   # Arguments for call prototype
-	my @argsgc = ();     # Arguments for gc call (with syscall6)
-	my @argsgccgo = ();  # Arguments for gccgo call (with C.name_of_syscall)
-	my $n = 0;
-	my $arg_n = 0;
-	foreach my $p (@in) {
-		my ($name, $type) = parseparam($p);
-		if($type =~ /^\*/) {
-			push @argscommun, "uintptr(unsafe.Pointer($name))";
-			push @argscall, "$name uintptr";
-			push @argsgc, "$name";
-			push @argsgccgo, "C.uintptr_t($name)";
-		} elsif($type eq "string" && $errvar ne "") {
-			$textcommon .= "\tvar _p$n $strconvtype\n";
-			$textcommon .= "\t_p$n, $errvar = $strconvfunc($name)\n";
-			$textcommon .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
-
-			push @argscommun, "uintptr(unsafe.Pointer(_p$n))";
-			push @argscall, "_p$n uintptr ";
-			push @argsgc, "_p$n";
-			push @argsgccgo, "C.uintptr_t(_p$n)";
-			$n++;
-		} elsif($type eq "string") {
-			print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
-			$textcommon .= "\tvar _p$n $strconvtype\n";
-			$textcommon .= "\t_p$n, $errvar = $strconvfunc($name)\n";
-			$textcommon .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
-
-			push @argscommun, "uintptr(unsafe.Pointer(_p$n))";
-			push @argscall, "_p$n uintptr";
-			push @argsgc, "_p$n";
-			push @argsgccgo, "C.uintptr_t(_p$n)";
-			$n++;
-		} elsif($type =~ /^\[\](.*)/) {
-			# Convert slice into pointer, length.
-			# Have to be careful not to take address of &a[0] if len == 0:
-			# pass nil in that case.
-			$textcommon .= "\tvar _p$n *$1\n";
-			$textcommon .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n";
-			push @argscommun, "uintptr(unsafe.Pointer(_p$n))", "len($name)";
-			push @argscall, "_p$n uintptr", "_lenp$n int";
-			push @argsgc, "_p$n", "uintptr(_lenp$n)";
-			push @argsgccgo, "C.uintptr_t(_p$n)", "C.size_t(_lenp$n)";
-			$n++;
-		} elsif($type eq "int64" && $_32bit ne "") {
-			print STDERR "$ARGV:$.: $func uses int64 with 32 bits mode. Case not yet implemented\n";
-			# if($_32bit eq "big-endian") {
-			# 	push @args, "uintptr($name >> 32)", "uintptr($name)";
-			# } else {
-			# 	push @args, "uintptr($name)", "uintptr($name >> 32)";
-			# }
-			# $n++;
-		} elsif($type eq "bool") {
-			print STDERR "$ARGV:$.: $func uses bool. Case not yet implemented\n";
-			# $text .= "\tvar _p$n uint32\n";
-			# $text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n";
-			# push @args, "_p$n";
-			# $n++;
-		} elsif($type =~ /^_/ ||$type eq "unsafe.Pointer") {
-			push @argscommun, "uintptr($name)";
-			push @argscall, "$name uintptr";
-			push @argsgc, "$name";
-			push @argsgccgo, "C.uintptr_t($name)";
-		} elsif($type eq "int") {
-			if (($arg_n == 0 || $arg_n == 2) && ($func eq "fcntl" || $func eq "FcntlInt" || $func eq "FcntlFlock")) {
-				# These fcntl arguments need to be uintptr to be able to call FcntlInt and FcntlFlock
-				push @argscommun, "uintptr($name)";
-				push @argscall, "$name uintptr";
-				push @argsgc, "$name";
-				push @argsgccgo, "C.uintptr_t($name)";
-			} else {
-				push @argscommun, "$name";
-				push @argscall, "$name int";
-				push @argsgc, "uintptr($name)";
-				push @argsgccgo, "C.int($name)";
-			}
-		} elsif($type eq "int32") {
-			push @argscommun, "$name";
-			push @argscall, "$name int32";
-			push @argsgc, "uintptr($name)";
-			push @argsgccgo, "C.int($name)";
-		} elsif($type eq "int64") {
-			push @argscommun, "$name";
-			push @argscall, "$name int64";
-			push @argsgc, "uintptr($name)";
-			push @argsgccgo, "C.longlong($name)";
-		} elsif($type eq "uint32") {
-			push @argscommun, "$name";
-			push @argscall, "$name uint32";
-			push @argsgc, "uintptr($name)";
-			push @argsgccgo, "C.uint($name)";
-		} elsif($type eq "uint64") {
-			push @argscommun, "$name";
-			push @argscall, "$name uint64";
-			push @argsgc, "uintptr($name)";
-			push @argsgccgo, "C.ulonglong($name)";
-		} elsif($type eq "uintptr") {
-			push @argscommun, "$name";
-			push @argscall, "$name uintptr";
-			push @argsgc, "$name";
-			push @argsgccgo, "C.uintptr_t($name)";
-		} else {
-			push @argscommun, "int($name)";
-			push @argscall, "$name int";
-			push @argsgc, "uintptr($name)";
-			push @argsgccgo, "C.int($name)";
-		}
-		$arg_n++;
-	}
-	my $nargs = @argsgc;
-
-	# COMMUN function generation
-	my $argscommun = join(', ', @argscommun);
-	my $callcommun = "call$sysname($argscommun)";
-	my @ret = ("_", "_");
-	my $body = "";
-	my $do_errno = 0;
-	for(my $i=0; $i<@out; $i++) {
-		my $p = $out[$i];
-		my ($name, $type) = parseparam($p);
-		my $reg = "";
-		if($name eq "err") {
-			$reg = "e1";
-			$ret[1] = $reg;
-			$do_errno = 1;
-		} else {
-			$reg = "r0";
-			$ret[0] = $reg;
-		}
-		if($type eq "bool") {
-			$reg = "$reg != 0";
-		}
-		if($reg ne "e1") {
-			$body .= "\t$name = $type($reg)\n";
-		}
-	}
-	if ($ret[0] eq "_"  && $ret[1] eq "_") {
-		$textcommon .= "\t$callcommun\n";
-	} else {
-		$textcommon .= "\t$ret[0], $ret[1] := $callcommun\n";
-	}
-	$textcommon .= $body;
-
-	if ($do_errno) {
-		$textcommon .= "\tif e1 != 0 {\n";
-		$textcommon .= "\t\terr = errnoErr(e1)\n";
-		$textcommon .= "\t}\n";
-	}
-	$textcommon .= "\treturn\n";
-	$textcommon .= "}\n";
-
-	if ($onlyCommon){
-		next
-	}
-	# CALL Prototype
-	my $callProto = sprintf "func call%s(%s) (r1 uintptr, e1 Errno) {\n", $sysname, join(', ', @argscall);
-
-	# GC function generation
-	my $asm = "syscall6";
-	if ($nonblock) {
-		$asm = "rawSyscall6";
-	}
-
-	if(@argsgc <= 6) {
-		while(@argsgc < 6) {
-			push @argsgc, "0";
-		}
-	} else {
-		print STDERR "$ARGV:$.: too many arguments to system call\n";
-	}
-	my $argsgc = join(', ', @argsgc);
-	my $callgc = "$asm(uintptr(unsafe.Pointer(&$sysvarname)), $nargs, $argsgc)";
-
-	$textgc .= $callProto;
-	$textgc .= "\tr1, _, e1 = $callgc\n";
-	$textgc .= "\treturn\n}\n";
-
-	# GCCGO function generation
-	my $argsgccgo = join(', ', @argsgccgo);
-	my $callgccgo = "C.$sysname($argsgccgo)";
-	$textgccgo .= $callProto;
-	$textgccgo .= "\tr1 = uintptr($callgccgo)\n";
-	$textgccgo .= "\te1 = syscall.GetErrno()\n";
-	$textgccgo .= "\treturn\n}\n";
-}
-
-if($errors) {
-	exit 1;
-}
-
-# Print zsyscall_aix_ppc64.go
-open(my $fcommun, '>', 'zsyscall_aix_ppc64.go');
-my $tofcommun = <<EOF;
-// $cmdline
-// Code generated by the command above; see README.md. DO NOT EDIT.
-
-// +build $tags
-
-package $package
-
-import (
-	"unsafe"
-)
-
-EOF
-
-$tofcommun .= "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
-
-$tofcommun .=<<EOF;
-
-$textcommon
-EOF
-print $fcommun $tofcommun;
-
-
-# Print zsyscall_aix_ppc64_gc.go
-open(my $fgc, '>', 'zsyscall_aix_ppc64_gc.go');
-my $tofgc = <<EOF;
-// $cmdline
-// Code generated by the command above; see README.md. DO NOT EDIT.
-
-// +build $tags
-// +build !gccgo
-
-package $package
-
-import (
-	"unsafe"
-)
-
-
-EOF
-
-$tofgc .= "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
-
-my $vardecls = "\t" . join(",\n\t", @vars);
-$vardecls .= " syscallFunc";
-
-$tofgc .=<<EOF;
-$dynimports
-$linknames
-type syscallFunc uintptr
-
-var (
-$vardecls
-)
-
-// Implemented in runtime/syscall_aix.go.
-func rawSyscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
-func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
-
-$textgc
-EOF
-print $fgc $tofgc;
-
-# Print zsyscall_aix_ppc64_gc.go
-open(my $fgccgo, '>', 'zsyscall_aix_ppc64_gccgo.go');
-my $tofgccgo = <<EOF;
-// $cmdline
-// Code generated by the command above; see README.md. DO NOT EDIT.
-
-// +build $tags
-// +build gccgo
-
-package $package
-
-
-$c_extern
-*/
-import "C"
-import (
-	"syscall"
-)
-
-
-EOF
-
-$tofgccgo .= "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
-
-$tofgccgo .=<<EOF;
-
-$textgccgo
-EOF
-print $fgccgo $tofgccgo;
-exit 0;

unix/zsyscall_aix_ppc64.go

@@ -1,4 +1,4 @@
-// mksyscall_aix_ppc64.pl -aix -tags aix,ppc64 syscall_aix.go syscall_aix_ppc64.go
+// go run mksyscall_aix_ppc64.go -aix -tags aix,ppc64 syscall_aix.go syscall_aix_ppc64.go
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build aix,ppc64

unix/zsyscall_aix_ppc64_gc.go

@@ -1,4 +1,4 @@
-// mksyscall_aix_ppc64.pl -aix -tags aix,ppc64 syscall_aix.go syscall_aix_ppc64.go
+// go run mksyscall_aix_ppc64.go -aix -tags aix,ppc64 syscall_aix.go syscall_aix_ppc64.go
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build aix,ppc64

unix/zsyscall_aix_ppc64_gccgo.go

@@ -1,4 +1,4 @@
-// mksyscall_aix_ppc64.pl -aix -tags aix,ppc64 syscall_aix.go syscall_aix_ppc64.go
+// go run mksyscall_aix_ppc64.go -aix -tags aix,ppc64 syscall_aix.go syscall_aix_ppc64.go
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build aix,ppc64