295 lines
7.1 KiB
Perl
295 lines
7.1 KiB
Perl
#!/usr/bin/env perl
|
|
# Copyright 2009 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_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
|
|
|
|
use strict;
|
|
|
|
my $cmdline = "mksyscall_solaris.pl " . join(' ', @ARGV);
|
|
my $errors = 0;
|
|
my $_32bit = "";
|
|
|
|
binmode STDOUT;
|
|
|
|
if($ARGV[0] eq "-b32") {
|
|
$_32bit = "big-endian";
|
|
shift;
|
|
} elsif($ARGV[0] eq "-l32") {
|
|
$_32bit = "little-endian";
|
|
shift;
|
|
}
|
|
|
|
if($ARGV[0] =~ /^-/) {
|
|
print STDERR "usage: mksyscall_solaris.pl [-b32 | -l32] [file ...]\n";
|
|
exit 1;
|
|
}
|
|
|
|
if($ENV{'GOARCH'} eq "" || $ENV{'GOOS'} eq "") {
|
|
print STDERR "GOARCH or GOOS not defined in environment\n";
|
|
exit 1;
|
|
}
|
|
|
|
sub parseparamlist($) {
|
|
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 $dynimports = "";
|
|
my $linknames = "";
|
|
my @vars = ();
|
|
while(<>) {
|
|
chomp;
|
|
s/\s+/ /g;
|
|
s/^\s+//;
|
|
s/\s+$//;
|
|
$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($out);
|
|
|
|
# So file name.
|
|
if($modname eq "") {
|
|
$modname = "libc";
|
|
}
|
|
|
|
# System call name.
|
|
if($sysname eq "") {
|
|
$sysname = "$func";
|
|
}
|
|
|
|
# System call pointer variable name.
|
|
my $sysvarname = "proc$sysname";
|
|
|
|
my $strconvfunc = "BytePtrFromString";
|
|
my $strconvtype = "*byte";
|
|
|
|
$sysname =~ y/A-Z/a-z/; # All libc functions are lowercase.
|
|
|
|
# Runtime import of function to allow cross-platform builds.
|
|
$dynimports .= "//go:cgo_import_dynamic libc_${sysname} ${sysname} \"$modname.so\"\n";
|
|
# Link symbol to proc address variable.
|
|
$linknames .= "//go:linkname ${sysvarname} libc_${sysname}\n";
|
|
# Library proc address variable.
|
|
push @vars, $sysvarname;
|
|
|
|
# Go function header.
|
|
$out = join(', ', @out);
|
|
if($out ne "") {
|
|
$out = " ($out)";
|
|
}
|
|
if($text ne "") {
|
|
$text .= "\n"
|
|
}
|
|
$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out;
|
|
|
|
# Check if err return available
|
|
my $errvar = "";
|
|
foreach my $p (@out) {
|
|
my ($name, $type) = parseparam($p);
|
|
if($type eq "error") {
|
|
$errvar = $name;
|
|
last;
|
|
}
|
|
}
|
|
|
|
# Prepare arguments to Syscall.
|
|
my @args = ();
|
|
my @uses = ();
|
|
my $n = 0;
|
|
foreach my $p (@in) {
|
|
my ($name, $type) = parseparam($p);
|
|
if($type =~ /^\*/) {
|
|
push @args, "uintptr(unsafe.Pointer($name))";
|
|
} elsif($type eq "string" && $errvar ne "") {
|
|
$text .= "\tvar _p$n $strconvtype\n";
|
|
$text .= "\t_p$n, $errvar = $strconvfunc($name)\n";
|
|
$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
|
|
push @args, "uintptr(unsafe.Pointer(_p$n))";
|
|
push @uses, "use(unsafe.Pointer(_p$n))";
|
|
$n++;
|
|
} elsif($type eq "string") {
|
|
print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
|
|
$text .= "\tvar _p$n $strconvtype\n";
|
|
$text .= "\t_p$n, _ = $strconvfunc($name)\n";
|
|
push @args, "uintptr(unsafe.Pointer(_p$n))";
|
|
push @uses, "use(unsafe.Pointer(_p$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, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))";
|
|
$n++;
|
|
} elsif($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)";
|
|
}
|
|
} 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$n = 0\n\t}\n";
|
|
push @args, "uintptr(_p$n)";
|
|
$n++;
|
|
} else {
|
|
push @args, "uintptr($name)";
|
|
}
|
|
}
|
|
my $nargs = @args;
|
|
|
|
# Determine which form to use; pad args with zeros.
|
|
my $asm = "sysvicall6";
|
|
if ($nonblock) {
|
|
$asm = "rawSysvicall6";
|
|
}
|
|
if(@args <= 6) {
|
|
while(@args < 6) {
|
|
push @args, "0";
|
|
}
|
|
} else {
|
|
print STDERR "$ARGV:$.: too many arguments to system call\n";
|
|
}
|
|
|
|
# Actual call.
|
|
my $args = join(', ', @args);
|
|
my $call = "$asm(uintptr(unsafe.Pointer(&$sysvarname)), $nargs, $args)";
|
|
|
|
# Assign return values.
|
|
my $body = "";
|
|
my $failexpr = "";
|
|
my @ret = ("_", "_", "_");
|
|
my @pout= ();
|
|
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[2] = $reg;
|
|
$do_errno = 1;
|
|
} else {
|
|
$reg = sprintf("r%d", $i);
|
|
$ret[$i] = $reg;
|
|
}
|
|
if($type eq "bool") {
|
|
$reg = "$reg != 0";
|
|
}
|
|
if($type eq "int64" && $_32bit ne "") {
|
|
# 64-bit number in r1:r0 or r0:r1.
|
|
if($i+2 > @out) {
|
|
print STDERR "$ARGV:$.: not enough registers for int64 return\n";
|
|
}
|
|
if($_32bit eq "big-endian") {
|
|
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
|
|
} else {
|
|
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
|
|
}
|
|
$ret[$i] = sprintf("r%d", $i);
|
|
$ret[$i+1] = sprintf("r%d", $i+1);
|
|
}
|
|
if($reg ne "e1") {
|
|
$body .= "\t$name = $type($reg)\n";
|
|
}
|
|
}
|
|
if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
|
|
$text .= "\t$call\n";
|
|
} else {
|
|
$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
|
|
}
|
|
foreach my $use (@uses) {
|
|
$text .= "\t$use\n";
|
|
}
|
|
$text .= $body;
|
|
|
|
if ($do_errno) {
|
|
$text .= "\tif e1 != 0 {\n";
|
|
$text .= "\t\terr = e1\n";
|
|
$text .= "\t}\n";
|
|
}
|
|
$text .= "\treturn\n";
|
|
$text .= "}\n";
|
|
}
|
|
|
|
if($errors) {
|
|
exit 1;
|
|
}
|
|
|
|
print <<EOF;
|
|
// $cmdline
|
|
// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
|
|
|
|
// +build $ENV{'GOARCH'},$ENV{'GOOS'}
|
|
|
|
package $package
|
|
|
|
import (
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
EOF
|
|
|
|
print "import \"golang.org/x/sys/unix\"\n" if $package ne "unix";
|
|
|
|
my $vardecls = "\t" . join(",\n\t", @vars);
|
|
$vardecls .= " syscallFunc";
|
|
|
|
chomp($_=<<EOF);
|
|
|
|
$dynimports
|
|
$linknames
|
|
var (
|
|
$vardecls
|
|
)
|
|
|
|
$text
|
|
EOF
|
|
print $_;
|
|
exit 0;
|