diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/mksyscall_solaris.go')
-rw-r--r-- | vendor/golang.org/x/sys/unix/mksyscall_solaris.go | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/unix/mksyscall_solaris.go b/vendor/golang.org/x/sys/unix/mksyscall_solaris.go new file mode 100644 index 000000000..3d864738b --- /dev/null +++ b/vendor/golang.org/x/sys/unix/mksyscall_solaris.go @@ -0,0 +1,335 @@ +// 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_solaris.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 +*/ + +package main + +import ( + "bufio" + "flag" + "fmt" + "os" + "regexp" + "strings" +) + +var ( + b32 = flag.Bool("b32", false, "32bit big-endian") + l32 = flag.Bool("l32", false, "32bit little-endian") + tags = flag.String("tags", "", "build tags") +) + +// cmdLine returns this programs's commandline arguments +func cmdLine() string { + return "go run mksyscall_solaris.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_solaris.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*)$`).FindStringSubmatch(p) + if ps == nil { + fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p) + os.Exit(1) + } + return Param{ps[1], ps[2]} +} + +func main() { + flag.Usage = usage + flag.Parse() + if len(flag.Args()) <= 0 { + fmt.Fprintf(os.Stderr, "no files to parse provided\n") + usage() + } + + endianness := "" + if *b32 { + endianness = "big-endian" + } else if *l32 { + endianness = "little-endian" + } + + pack := "" + text := "" + dynimports := "" + linknames := "" + var vars []string + for _, path := range flag.Args() { + file, err := os.Open(path) + if err != nil { + fmt.Fprintf(os.Stderr, err.Error()) + os.Exit(1) + } + s := bufio.NewScanner(file) + for s.Scan() { + t := s.Text() + t = strings.TrimSpace(t) + t = regexp.MustCompile(`\s+`).ReplaceAllString(t, ` `) + if p := regexp.MustCompile(`^package (\S+)$`).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, ", ") + + // 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. + text += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n" + + // So file name. + if modname == "" { + modname = "libc" + } + + // System call name. + if sysname == "" { + sysname = funct + } + + // System call pointer variable name. + sysvarname := fmt.Sprintf("proc%s", sysname) + + strconvfunc := "BytePtrFromString" + strconvtype := "*byte" + + sysname = strings.ToLower(sysname) // All libc functions are lowercase. + + // Runtime import of function to allow cross-platform builds. + dynimports += fmt.Sprintf("//go:cgo_import_dynamic libc_%s %s \"%s.so\"\n", sysname, sysname, modname) + // Link symbol to proc address variable. + linknames += fmt.Sprintf("//go:linkname %s libc_%s\n", sysvarname, sysname) + // Library proc address variable. + vars = append(vars, sysvarname) + + // Go function header. + outlist := strings.Join(out, ", ") + if outlist != "" { + outlist = fmt.Sprintf(" (%s)", outlist) + } + if text != "" { + text += "\n" + } + text += fmt.Sprintf("func %s(%s)%s {\n", funct, strings.Join(in, ", "), outlist) + + // Check if err return available + errvar := "" + for _, param := range out { + p := parseParam(param) + if p.Type == "error" { + errvar = p.Name + continue + } + } + + // Prepare arguments to Syscall. + var args []string + n := 0 + for _, param := range in { + p := parseParam(param) + if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil { + args = append(args, "uintptr(unsafe.Pointer("+p.Name+"))") + } else if p.Type == "string" && errvar != "" { + text += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype) + text += fmt.Sprintf("\t_p%d, %s = %s(%s)\n", n, errvar, strconvfunc, p.Name) + text += fmt.Sprintf("\tif %s != nil {\n\t\treturn\n\t}\n", errvar) + args = append(args, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n)) + n++ + } else if p.Type == "string" { + fmt.Fprintf(os.Stderr, path+":"+funct+" uses string arguments, but has no error return\n") + text += fmt.Sprintf("\tvar _p%d %s\n", n, strconvtype) + text += fmt.Sprintf("\t_p%d, _ = %s(%s)\n", n, strconvfunc, p.Name) + args = append(args, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n)) + n++ + } else if s := regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type); s != 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. + text += fmt.Sprintf("\tvar _p%d *%s\n", n, s[1]) + text += fmt.Sprintf("\tif len(%s) > 0 {\n\t\t_p%d = &%s[0]\n\t}\n", p.Name, n, p.Name) + args = append(args, fmt.Sprintf("uintptr(unsafe.Pointer(_p%d))", n), fmt.Sprintf("uintptr(len(%s))", p.Name)) + n++ + } else if p.Type == "int64" && endianness != "" { + if endianness == "big-endian" { + args = append(args, fmt.Sprintf("uintptr(%s>>32)", p.Name), fmt.Sprintf("uintptr(%s)", p.Name)) + } else { + args = append(args, fmt.Sprintf("uintptr(%s)", p.Name), fmt.Sprintf("uintptr(%s>>32)", p.Name)) + } + } else if p.Type == "bool" { + text += fmt.Sprintf("\tvar _p%d uint32\n", n) + text += fmt.Sprintf("\tif %s {\n\t\t_p%d = 1\n\t} else {\n\t\t_p%d = 0\n\t}\n", p.Name, n, n) + args = append(args, fmt.Sprintf("uintptr(_p%d)", n)) + n++ + } else { + args = append(args, fmt.Sprintf("uintptr(%s)", p.Name)) + } + } + nargs := len(args) + + // Determine which form to use; pad args with zeros. + asm := "sysvicall6" + if nonblock != nil { + asm = "rawSysvicall6" + } + if len(args) <= 6 { + for len(args) < 6 { + args = append(args, "0") + } + } else { + fmt.Fprintf(os.Stderr, "%s: too many arguments to system call\n", path) + os.Exit(1) + } + + // Actual call. + arglist := strings.Join(args, ", ") + call := fmt.Sprintf("%s(uintptr(unsafe.Pointer(&%s)), %d, %s)", asm, sysvarname, nargs, arglist) + + // Assign return values. + body := "" + ret := []string{"_", "_", "_"} + doErrno := false + for i := 0; i < len(out); i++ { + p := parseParam(out[i]) + reg := "" + if p.Name == "err" { + reg = "e1" + ret[2] = reg + doErrno = true + } else { + reg = fmt.Sprintf("r%d", i) + ret[i] = reg + } + if p.Type == "bool" { + reg = fmt.Sprintf("%d != 0", reg) + } + if p.Type == "int64" && endianness != "" { + // 64-bit number in r1:r0 or r0:r1. + if i+2 > len(out) { + fmt.Fprintf(os.Stderr, "%s: not enough registers for int64 return\n", path) + os.Exit(1) + } + if endianness == "big-endian" { + reg = fmt.Sprintf("int64(r%d)<<32 | int64(r%d)", i, i+1) + } else { + reg = fmt.Sprintf("int64(r%d)<<32 | int64(r%d)", i+1, i) + } + ret[i] = fmt.Sprintf("r%d", i) + ret[i+1] = fmt.Sprintf("r%d", i+1) + } + if reg != "e1" { + body += fmt.Sprintf("\t%s = %s(%s)\n", p.Name, p.Type, reg) + } + } + if ret[0] == "_" && ret[1] == "_" && ret[2] == "_" { + text += fmt.Sprintf("\t%s\n", call) + } else { + text += fmt.Sprintf("\t%s, %s, %s := %s\n", ret[0], ret[1], ret[2], call) + } + text += body + + if doErrno { + text += "\tif e1 != 0 {\n" + text += "\t\terr = e1\n" + text += "\t}\n" + } + text += "\treturn\n" + text += "}\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" + + } + vardecls := "\t" + strings.Join(vars, ",\n\t") + vardecls += " syscallFunc" + fmt.Printf(srcTemplate, cmdLine(), buildTags(), pack, imp, dynimports, linknames, vardecls, text) +} + +const srcTemplate = `// %s +// Code generated by the command above; see README.md. DO NOT EDIT. + +// +build %s + +package %s + +import ( + "syscall" + "unsafe" +) +%s +%s +%s +var ( +%s +) + +%s +` |