295 lines
7.2 KiB
Perl
295 lines
7.2 KiB
Perl
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#!/usr/bin/env perl
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# Copyright 2009 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# This program reads a file containing function prototypes
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# (like syscall_solaris.go) and generates system call bodies.
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# The prototypes are marked by lines beginning with "//sys"
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# and read like func declarations if //sys is replaced by func, but:
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# * The parameter lists must give a name for each argument.
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# This includes return parameters.
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# * The parameter lists must give a type for each argument:
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# the (x, y, z int) shorthand is not allowed.
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# * If the return parameter is an error number, it must be named err.
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# * If go func name needs to be different than its libc name,
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# * or the function is not in libc, name could be specified
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# * at the end, after "=" sign, like
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# //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt
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use strict;
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my $cmdline = "mksyscall_solaris.pl " . join(' ', @ARGV);
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my $errors = 0;
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my $_32bit = "";
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my $tags = ""; # build tags
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binmode STDOUT;
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if($ARGV[0] eq "-b32") {
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$_32bit = "big-endian";
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shift;
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} elsif($ARGV[0] eq "-l32") {
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$_32bit = "little-endian";
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shift;
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}
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if($ARGV[0] eq "-tags") {
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shift;
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$tags = $ARGV[0];
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shift;
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}
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if($ARGV[0] =~ /^-/) {
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print STDERR "usage: mksyscall_solaris.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
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exit 1;
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}
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sub parseparamlist($) {
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my ($list) = @_;
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$list =~ s/^\s*//;
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$list =~ s/\s*$//;
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if($list eq "") {
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return ();
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}
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return split(/\s*,\s*/, $list);
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}
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sub parseparam($) {
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my ($p) = @_;
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if($p !~ /^(\S*) (\S*)$/) {
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print STDERR "$ARGV:$.: malformed parameter: $p\n";
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$errors = 1;
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return ("xx", "int");
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}
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return ($1, $2);
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}
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my $package = "";
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my $text = "";
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my $dynimports = "";
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my $linknames = "";
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my @vars = ();
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while(<>) {
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chomp;
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s/\s+/ /g;
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s/^\s+//;
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s/\s+$//;
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$package = $1 if !$package && /^package (\S+)$/;
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my $nonblock = /^\/\/sysnb /;
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next if !/^\/\/sys / && !$nonblock;
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# Line must be of the form
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# func Open(path string, mode int, perm int) (fd int, err error)
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# Split into name, in params, out params.
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if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) {
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print STDERR "$ARGV:$.: malformed //sys declaration\n";
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$errors = 1;
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next;
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}
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my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6);
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# Split argument lists on comma.
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my @in = parseparamlist($in);
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my @out = parseparamlist($out);
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# Try in vain to keep people from editing this file.
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# The theory is that they jump into the middle of the file
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# without reading the header.
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$text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
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# So file name.
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if($modname eq "") {
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$modname = "libc";
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}
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# System call name.
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if($sysname eq "") {
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$sysname = "$func";
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}
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# System call pointer variable name.
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my $sysvarname = "proc$sysname";
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my $strconvfunc = "BytePtrFromString";
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my $strconvtype = "*byte";
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$sysname =~ y/A-Z/a-z/; # All libc functions are lowercase.
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# Runtime import of function to allow cross-platform builds.
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$dynimports .= "//go:cgo_import_dynamic libc_${sysname} ${sysname} \"$modname.so\"\n";
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# Link symbol to proc address variable.
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$linknames .= "//go:linkname ${sysvarname} libc_${sysname}\n";
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# Library proc address variable.
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push @vars, $sysvarname;
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# Go function header.
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$out = join(', ', @out);
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if($out ne "") {
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$out = " ($out)";
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}
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if($text ne "") {
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$text .= "\n"
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}
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$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out;
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# Check if err return available
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my $errvar = "";
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foreach my $p (@out) {
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my ($name, $type) = parseparam($p);
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if($type eq "error") {
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$errvar = $name;
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last;
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}
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}
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# Prepare arguments to Syscall.
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my @args = ();
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my $n = 0;
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foreach my $p (@in) {
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my ($name, $type) = parseparam($p);
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if($type =~ /^\*/) {
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push @args, "uintptr(unsafe.Pointer($name))";
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} elsif($type eq "string" && $errvar ne "") {
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$text .= "\tvar _p$n $strconvtype\n";
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$text .= "\t_p$n, $errvar = $strconvfunc($name)\n";
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$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
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push @args, "uintptr(unsafe.Pointer(_p$n))";
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$n++;
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} elsif($type eq "string") {
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print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
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$text .= "\tvar _p$n $strconvtype\n";
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$text .= "\t_p$n, _ = $strconvfunc($name)\n";
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push @args, "uintptr(unsafe.Pointer(_p$n))";
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$n++;
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} elsif($type =~ /^\[\](.*)/) {
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# Convert slice into pointer, length.
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# Have to be careful not to take address of &a[0] if len == 0:
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# pass nil in that case.
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$text .= "\tvar _p$n *$1\n";
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$text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n";
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push @args, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))";
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$n++;
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} elsif($type eq "int64" && $_32bit ne "") {
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if($_32bit eq "big-endian") {
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push @args, "uintptr($name >> 32)", "uintptr($name)";
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} else {
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push @args, "uintptr($name)", "uintptr($name >> 32)";
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}
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} elsif($type eq "bool") {
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$text .= "\tvar _p$n uint32\n";
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$text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n";
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push @args, "uintptr(_p$n)";
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$n++;
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} else {
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push @args, "uintptr($name)";
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}
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}
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my $nargs = @args;
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# Determine which form to use; pad args with zeros.
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my $asm = "sysvicall6";
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if ($nonblock) {
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$asm = "rawSysvicall6";
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}
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if(@args <= 6) {
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while(@args < 6) {
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push @args, "0";
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}
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} else {
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print STDERR "$ARGV:$.: too many arguments to system call\n";
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}
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# Actual call.
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my $args = join(', ', @args);
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my $call = "$asm(uintptr(unsafe.Pointer(&$sysvarname)), $nargs, $args)";
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# Assign return values.
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my $body = "";
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my $failexpr = "";
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my @ret = ("_", "_", "_");
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my @pout= ();
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my $do_errno = 0;
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for(my $i=0; $i<@out; $i++) {
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my $p = $out[$i];
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my ($name, $type) = parseparam($p);
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my $reg = "";
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if($name eq "err") {
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$reg = "e1";
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$ret[2] = $reg;
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$do_errno = 1;
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} else {
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$reg = sprintf("r%d", $i);
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$ret[$i] = $reg;
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}
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if($type eq "bool") {
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$reg = "$reg != 0";
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}
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if($type eq "int64" && $_32bit ne "") {
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# 64-bit number in r1:r0 or r0:r1.
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if($i+2 > @out) {
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print STDERR "$ARGV:$.: not enough registers for int64 return\n";
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}
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if($_32bit eq "big-endian") {
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$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
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} else {
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$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
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}
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$ret[$i] = sprintf("r%d", $i);
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$ret[$i+1] = sprintf("r%d", $i+1);
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}
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if($reg ne "e1") {
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$body .= "\t$name = $type($reg)\n";
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}
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}
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if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
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$text .= "\t$call\n";
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} else {
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$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
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}
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$text .= $body;
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if ($do_errno) {
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$text .= "\tif e1 != 0 {\n";
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$text .= "\t\terr = e1\n";
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$text .= "\t}\n";
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}
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$text .= "\treturn\n";
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$text .= "}\n";
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}
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if($errors) {
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exit 1;
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}
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print <<EOF;
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// $cmdline
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// Code generated by the command above; see README.md. DO NOT EDIT.
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// +build $tags
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package $package
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import (
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"syscall"
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"unsafe"
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)
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EOF
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print "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
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my $vardecls = "\t" . join(",\n\t", @vars);
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$vardecls .= " syscallFunc";
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chomp($_=<<EOF);
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$dynimports
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$linknames
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var (
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$vardecls
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)
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$text
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EOF
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print $_;
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exit 0;
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