386 lines
9.2 KiB
Perl
386 lines
9.2 KiB
Perl
#!/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
|
|
|
|
use strict;
|
|
|
|
my $cmdline = "mksyscall_aix.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 = "";
|
|
my $text = "";
|
|
my $c_extern = "/*\n#include <stdint.h>\n";
|
|
my @vars = ();
|
|
while(<>) {
|
|
chomp;
|
|
s/\s+/ /g;
|
|
s/^\s+//;
|
|
s/\s+$//;
|
|
$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);
|
|
|
|
# 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";
|
|
|
|
# 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 = $type;
|
|
}
|
|
}
|
|
|
|
# System call name.
|
|
#if($func ne "fcntl") {
|
|
|
|
if($sysname eq "") {
|
|
$sysname = "$func";
|
|
}
|
|
|
|
$sysname =~ s/([a-z])([A-Z])/${1}_$2/g;
|
|
$sysname =~ y/A-Z/a-z/; # All libc functions are lowercase.
|
|
|
|
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";
|
|
}
|
|
|
|
# Change types to c
|
|
my @c_in = ();
|
|
foreach my $p (@in) {
|
|
my ($name, $type) = parseparam($p);
|
|
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") {
|
|
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 ($func ne "fcntl" && $func ne "FcntlInt" && $func ne "readlen" && $func ne "writelen") {
|
|
# Imports of system calls from libc
|
|
$c_extern .= "$C_rettype $sysname";
|
|
my $c_in = join(', ', @c_in);
|
|
$c_extern .= "($c_in);\n";
|
|
}
|
|
|
|
# So file name.
|
|
if($aix) {
|
|
if($modname eq "") {
|
|
$modname = "libc.a/shr_64.o";
|
|
} else {
|
|
print STDERR "$func: only syscall using libc are available\n";
|
|
$errors = 1;
|
|
next;
|
|
}
|
|
}
|
|
|
|
my $strconvfunc = "C.CString";
|
|
my $strconvtype = "*byte";
|
|
|
|
# Go function header.
|
|
if($out ne "") {
|
|
$out = " ($out)";
|
|
}
|
|
if($text ne "") {
|
|
$text .= "\n"
|
|
}
|
|
|
|
$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out ;
|
|
|
|
# Prepare arguments to call.
|
|
my @args = ();
|
|
my $n = 0;
|
|
my $arg_n = 0;
|
|
foreach my $p (@in) {
|
|
my ($name, $type) = parseparam($p);
|
|
if($type =~ /^\*/) {
|
|
push @args, "C.uintptr_t(uintptr(unsafe.Pointer($name)))";
|
|
} elsif($type eq "string" && $errvar ne "") {
|
|
$text .= "\t_p$n := uintptr(unsafe.Pointer($strconvfunc($name)))\n";
|
|
push @args, "C.uintptr_t(_p$n)";
|
|
$n++;
|
|
} elsif($type eq "string") {
|
|
print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
|
|
$text .= "\t_p$n := uintptr(unsafe.Pointer($strconvfunc($name)))\n";
|
|
push @args, "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.
|
|
$text .= "\tvar _p$n *$1\n";
|
|
$text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n";
|
|
push @args, "C.uintptr_t(uintptr(unsafe.Pointer(_p$n)))";
|
|
$n++;
|
|
$text .= "\tvar _p$n int\n";
|
|
$text .= "\t_p$n = len($name)\n";
|
|
push @args, "C.size_t(_p$n)";
|
|
$n++;
|
|
} elsif($type eq "int64" && $_32bit ne "") {
|
|
if($_32bit eq "big-endian") {
|
|
push @args, "uintptr($name >> 32)", "uintptr($name)";
|
|
} else {
|
|
push @args, "uintptr($name)", "uintptr($name >> 32)";
|
|
}
|
|
$n++;
|
|
} elsif($type eq "bool") {
|
|
$text .= "\tvar _p$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 =~ /^_/) {
|
|
push @args, "C.uintptr_t(uintptr($name))";
|
|
} elsif($type eq "unsafe.Pointer") {
|
|
push @args, "C.uintptr_t(uintptr($name))";
|
|
} elsif($type eq "int") {
|
|
if (($arg_n == 2) && (($func eq "readlen") || ($func eq "writelen"))) {
|
|
push @args, "C.size_t($name)";
|
|
} elsif ($arg_n == 0 && $func eq "fcntl") {
|
|
push @args, "C.uintptr_t($name)";
|
|
} elsif (($arg_n == 2) && (($func eq "fcntl") || ($func eq "FcntlInt"))) {
|
|
push @args, "C.uintptr_t($name)";
|
|
} else {
|
|
push @args, "C.int($name)";
|
|
}
|
|
} elsif($type eq "int32") {
|
|
push @args, "C.int($name)";
|
|
} elsif($type eq "int64") {
|
|
push @args, "C.longlong($name)";
|
|
} elsif($type eq "uint32") {
|
|
push @args, "C.uint($name)";
|
|
} elsif($type eq "uint64") {
|
|
push @args, "C.ulonglong($name)";
|
|
} elsif($type eq "uintptr") {
|
|
push @args, "C.uintptr_t($name)";
|
|
} else {
|
|
push @args, "C.int($name)";
|
|
}
|
|
$arg_n++;
|
|
}
|
|
my $nargs = @args;
|
|
|
|
|
|
# Determine which form to use; pad args with zeros.
|
|
if ($nonblock) {
|
|
}
|
|
|
|
my $args = join(', ', @args);
|
|
my $call = "";
|
|
if ($sysname eq "exit") {
|
|
if ($errvar ne "") {
|
|
$call .= "er :=";
|
|
} else {
|
|
$call .= "";
|
|
}
|
|
} elsif ($errvar ne "") {
|
|
$call .= "r0,er :=";
|
|
} elsif ($retvar ne "") {
|
|
$call .= "r0,_ :=";
|
|
} else {
|
|
$call .= ""
|
|
}
|
|
$call .= "C.$sysname($args)";
|
|
|
|
# Assign return values.
|
|
my $body = "";
|
|
my $failexpr = "";
|
|
|
|
for(my $i=0; $i<@out; $i++) {
|
|
my $p = $out[$i];
|
|
my ($name, $type) = parseparam($p);
|
|
my $reg = "";
|
|
if($name eq "err") {
|
|
$reg = "e1";
|
|
} else {
|
|
$reg = "r0";
|
|
}
|
|
if($reg ne "e1" ) {
|
|
$body .= "\t$name = $type($reg)\n";
|
|
}
|
|
}
|
|
|
|
# verify return
|
|
if ($sysname ne "exit" && $errvar ne "") {
|
|
if ($C_rettype =~ /^uintptr/) {
|
|
$body .= "\tif \(uintptr\(r0\) ==\^uintptr\(0\) && er != nil\) {\n";
|
|
$body .= "\t\t$errvar = er\n";
|
|
$body .= "\t}\n";
|
|
} else {
|
|
$body .= "\tif \(r0 ==-1 && er != nil\) {\n";
|
|
$body .= "\t\t$errvar = er\n";
|
|
$body .= "\t}\n";
|
|
}
|
|
} elsif ($errvar ne "") {
|
|
$body .= "\tif \(er != nil\) {\n";
|
|
$body .= "\t\t$errvar = er\n";
|
|
$body .= "\t}\n";
|
|
}
|
|
|
|
$text .= "\t$call\n";
|
|
$text .= $body;
|
|
|
|
$text .= "\treturn\n";
|
|
$text .= "}\n";
|
|
}
|
|
|
|
if($errors) {
|
|
exit 1;
|
|
}
|
|
|
|
print <<EOF;
|
|
// $cmdline
|
|
// Code generated by the command above; see README.md. DO NOT EDIT.
|
|
|
|
// +build $tags
|
|
|
|
package $package
|
|
|
|
|
|
$c_extern
|
|
*/
|
|
import "C"
|
|
import (
|
|
"unsafe"
|
|
"syscall"
|
|
)
|
|
|
|
|
|
EOF
|
|
|
|
print "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
|
|
|
|
chomp($_=<<EOF);
|
|
|
|
$text
|
|
EOF
|
|
print $_;
|
|
exit 0;
|