new development tools
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291
src/jehanne/cmd/usyscalls/usyscalls.go
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291
src/jehanne/cmd/usyscalls/usyscalls.go
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/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
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*
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* Jehanne is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* Jehanne is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"strings"
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"text/template"
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)
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const gplHeader string = `/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
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*
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* Jehanne is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* Jehanne is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* automatically generated by usyscalls */
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`
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type SyscallConf struct {
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Ret []string
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Args []string
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Name string
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Id uint32
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}
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type Sysconf struct {
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Syscalls []SyscallConf
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}
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type SyscallWrapper struct {
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Id uint32
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Name string
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FuncArgs string
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MacroArgs string
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VarValues []string
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Vars []string
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AsmArgs string
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AsmClobbers string
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RetType string
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}
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type HeaderCode struct {
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Wrappers []SyscallWrapper
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}
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func usage(msg string) {
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fmt.Fprint(os.Stderr, msg)
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fmt.Fprint(os.Stderr, "Usage: usyscalls header|code path/to/sysconf.json\n")
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flag.PrintDefaults()
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os.Exit(1)
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}
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func argTypeName(t string) string{
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switch(t){
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case "int", "int32_t":
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return "i"
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case "unsigned int", "uint32_t":
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/* unsigned int is reserved for flags */
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return "ui"
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case "long", "int64_t":
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return "l"
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case "unsigned long", "uint64_t":
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return "ul"
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case "void*", "uint8_t*", "const void*", "const uint8_t*":
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return "p"
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case "int32_t*", "int*", "const int32_t*", "const int*":
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return "p"
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case "const char*", "char*":
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return "p"
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case "const char**", "char**":
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return "p"
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}
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return " [?? " + t + "]"
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}
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func argRegister(index int, t string) string{
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prefix := ""
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switch(t){
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case "int", "unsigned int", "uint32_t", "int32_t":
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prefix = "e"
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default:
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prefix = "r"
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}
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switch(index){
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case 0:
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return prefix + "di";
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case 1:
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return prefix + "si";
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case 2:
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return prefix + "dx";
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case 3:
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return "r10";
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case 4:
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return "r8";
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case 5:
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return "r9";
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}
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return ""
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}
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func getHeaderData(calls []SyscallConf) *HeaderCode {
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code := new(HeaderCode)
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for _, call := range(calls) {
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wcall := new(SyscallWrapper)
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wcall.Id = call.Id
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wcall.Name = call.Name
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wcall.RetType = call.Ret[0]
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clobberMemory := false
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wcall.AsmClobbers = "\"cc\", \"rcx\", \"r11\""
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wcall.AsmArgs = fmt.Sprintf("\"0\"(%d)", wcall.Id)
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for i, a := range(call.Args){
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if i > 0 {
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wcall.FuncArgs += ", "
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wcall.MacroArgs += ", "
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}
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if strings.HasSuffix(a, "*") && !strings.HasPrefix(a, "const"){
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clobberMemory = true
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}
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wcall.FuncArgs += fmt.Sprintf("%s a%d", a, i)
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wcall.MacroArgs += fmt.Sprintf("/* %s */ a%d", a, i)
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wcall.VarValues = append(wcall.VarValues, fmt.Sprintf("_sysargs[%d].%s = (a%d); \\\n\t", i, argTypeName(a), i))
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wcall.Vars = append(wcall.Vars, fmt.Sprintf("register %s __r%d asm(\"%s\") = _sysargs[%d].%s; \\\n\t", a, i, argRegister(i, a), i, argTypeName(a)))
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wcall.AsmArgs += fmt.Sprintf(", \"r\"(__r%d)", i)
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}
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if clobberMemory {
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wcall.AsmClobbers += ", \"memory\""
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}
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code.Wrappers = append(code.Wrappers, *wcall)
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}
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return code
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}
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func generateSyscallTable(calls []SyscallConf){
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code := getHeaderData(calls)
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tmpl, err := template.New("tab.c").Parse(`
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{{ range .Wrappers }}"{{ .Name }}", (int(*)()) {{ .Name }},
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{{ end }}
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`)
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err = tmpl.Execute(os.Stdout, code)
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if err != nil {
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log.Fatal(err)
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}
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}
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func generateLibcCode(calls []SyscallConf){
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code := getHeaderData(calls)
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tmpl, err := template.New("syscalls.c").Parse(gplHeader + `
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#define PORTABLE_SYSCALLS
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#include <u.h>
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{{ range .Wrappers }}
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{{ .RetType }}
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{{ .Name }}({{ .FuncArgs }})
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{
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register {{ .RetType }} __ret asm ("rax");
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__asm__ __volatile__ (
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"movq %%rcx, %%r10" "\n\t"
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"movq ${{ .Id }}, %%rax" "\n\t"
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"syscall"
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: "=r" (__ret)
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: /* args are ready */
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: {{ .AsmClobbers }}
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);
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return __ret;
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}
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{{ end }}
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`)
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err = tmpl.Execute(os.Stdout, code)
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if err != nil {
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log.Fatal(err)
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}
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}
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func generateSyscallHeader(calls []SyscallConf){
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funcMap := template.FuncMap{
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"title": strings.Title,
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}
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code := getHeaderData(calls)
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tmpl, err := template.New("syscall.h").Funcs(funcMap).Parse(gplHeader + `
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typedef enum Syscalls
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{
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{{ range .Wrappers }} Sys{{ .Name|title }} = {{ .Id }},
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{{ end }}} Syscalls;
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#ifndef KERNEL
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{{ range .Wrappers }}
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#define sys_{{ .Name }}({{ .MacroArgs }}) ({ \
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{{ range .VarValues }}{{.}}{{end}}{{ range .Vars }}{{.}}{{end}}register {{ .RetType }} __ret asm ("rax"); \
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__asm__ __volatile__ ( \
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"syscall" \
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: "=&r" (__ret) \
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: {{ .AsmArgs }} \
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: {{ .AsmClobbers }} \
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); \
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__ret; })
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{{ end }}
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#ifdef PORTABLE_SYSCALLS
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{{ range .Wrappers }}extern {{ .RetType }} {{ .Name }}({{ .FuncArgs }});
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{{ end }}
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extern int32_t read(int, void*, int32_t);
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extern int32_t write(int, const void*, int32_t);
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#else
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{{ range .Wrappers }}# define {{ .Name }}(...) sys_{{ .Name }}(__VA_ARGS__)
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{{ end }}
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#define read(fd, buf, size) pread(fd, buf, size, -1)
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#define write(fd, buf, size) pwrite(fd, buf, size, -1)
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#endif
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#endif
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`)
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err = tmpl.Execute(os.Stdout, code)
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if err != nil {
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log.Fatal(err)
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}
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}
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func main() {
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flag.Parse()
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if flag.NArg() != 2 {
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usage("no path to sysconf.json")
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}
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buf, err := ioutil.ReadFile(flag.Arg(1))
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if err != nil {
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log.Fatal(err)
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}
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var sysconf Sysconf
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err = json.Unmarshal(buf, &sysconf)
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if err != nil {
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log.Fatal(err)
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}
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mode := flag.Arg(0)
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switch(mode){
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case "header":
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generateSyscallHeader(sysconf.Syscalls)
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break
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case "code":
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generateLibcCode(sysconf.Syscalls)
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break
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case "tab":
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generateSyscallTable(sysconf.Syscalls)
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break
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}
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}
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