mirror of
https://github.com/elisescu/tty-server
synced 2024-11-17 09:25:38 +00:00
336 lines
9.4 KiB
Go
336 lines
9.4 KiB
Go
// 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
|
|
`
|