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mksyscall_aix_ppc64.pl
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mksyscall_aix_ppc64.pl
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#!/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;

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