+++ /dev/null
-#!/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_darwin.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 errno.
-
-# A line beginning with //sysnb is like //sys, except that the
-# goroutine will not be suspended during the execution of the system
-# call. This must only be used for system calls which can never
-# block, as otherwise the system call could cause all goroutines to
-# hang.
-
-use strict;
-
-my $cmdline = "mksyscall.pl " . join(' ', @ARGV);
-my $errors = 0;
-my $_32bit = "";
-my $plan9 = 0;
-my $openbsd = 0;
-my $netbsd = 0;
-my $dragonfly = 0;
-my $arm = 0; # 64-bit value should use (even, odd)-pair
-my $tags = ""; # build tags
-
-if($ARGV[0] eq "-b32") {
- $_32bit = "big-endian";
- shift;
-} elsif($ARGV[0] eq "-l32") {
- $_32bit = "little-endian";
- shift;
-}
-if($ARGV[0] eq "-plan9") {
- $plan9 = 1;
- shift;
-}
-if($ARGV[0] eq "-openbsd") {
- $openbsd = 1;
- shift;
-}
-if($ARGV[0] eq "-netbsd") {
- $netbsd = 1;
- shift;
-}
-if($ARGV[0] eq "-dragonfly") {
- $dragonfly = 1;
- shift;
-}
-if($ARGV[0] eq "-arm") {
- $arm = 1;
- shift;
-}
-if($ARGV[0] eq "-tags") {
- shift;
- $tags = $ARGV[0];
- shift;
-}
-
-if($ARGV[0] =~ /^-/) {
- print STDERR "usage: mksyscall.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
- exit 1;
-}
-
-# Check that we are using the new build system if we should
-if($ENV{'GOOS'} eq "linux" && $ENV{'GOARCH'} ne "sparc64") {
- if($ENV{'GOLANG_SYS_BUILD'} ne "docker") {
- print STDERR "In the new build system, mksyscall should not be called directly.\n";
- print STDERR "See README.md\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 $text = "";
-while(<>) {
- chomp;
- s/\s+/ /g;
- s/^\s+//;
- s/\s+$//;
- my $nonblock = /^\/\/sysnb /;
- next if !/^\/\/sys / && !$nonblock;
-
- # Line must be of the form
- # func Open(path string, mode int, perm int) (fd int, errno error)
- # Split into name, in params, out params.
- if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*((?i)SYS_[A-Z0-9_]+))?$/) {
- print STDERR "$ARGV:$.: malformed //sys declaration\n";
- $errors = 1;
- next;
- }
- my ($func, $in, $out, $sysname) = ($2, $3, $4, $5);
-
- # Split argument lists on comma.
- my @in = parseparamlist($in);
- my @out = parseparamlist($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";
-
- # Go function header.
- my $out_decl = @out ? sprintf(" (%s)", join(', ', @out)) : "";
- $text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out_decl;
-
- # 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 $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 *byte\n";
- $text .= "\t_p$n, $errvar = BytePtrFromString($name)\n";
- $text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
- push @args, "uintptr(unsafe.Pointer(_p$n))";
- $n++;
- } elsif($type eq "string") {
- print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
- $text .= "\tvar _p$n *byte\n";
- $text .= "\t_p$n, _ = BytePtrFromString($name)\n";
- push @args, "uintptr(unsafe.Pointer(_p$n))";
- $n++;
- } elsif($type =~ /^\[\](.*)/) {
- # Convert slice into pointer, length.
- # Have to be careful not to take address of &a[0] if len == 0:
- # pass dummy pointer in that case.
- # Used to pass nil, but some OSes or simulators reject write(fd, nil, 0).
- $text .= "\tvar _p$n unsafe.Pointer\n";
- $text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
- $text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero)\n\t}";
- $text .= "\n";
- push @args, "uintptr(_p$n)", "uintptr(len($name))";
- $n++;
- } elsif($type eq "int64" && ($openbsd || $netbsd)) {
- push @args, "0";
- if($_32bit eq "big-endian") {
- push @args, "uintptr($name>>32)", "uintptr($name)";
- } elsif($_32bit eq "little-endian") {
- push @args, "uintptr($name)", "uintptr($name>>32)";
- } else {
- push @args, "uintptr($name)";
- }
- } elsif($type eq "int64" && $dragonfly) {
- if ($func !~ /^extp(read|write)/i) {
- push @args, "0";
- }
- if($_32bit eq "big-endian") {
- push @args, "uintptr($name>>32)", "uintptr($name)";
- } elsif($_32bit eq "little-endian") {
- push @args, "uintptr($name)", "uintptr($name>>32)";
- } else {
- push @args, "uintptr($name)";
- }
- } elsif($type eq "int64" && $_32bit ne "") {
- if(@args % 2 && $arm) {
- # arm abi specifies 64-bit argument uses
- # (even, odd) pair
- push @args, "0"
- }
- if($_32bit eq "big-endian") {
- push @args, "uintptr($name>>32)", "uintptr($name)";
- } else {
- push @args, "uintptr($name)", "uintptr($name>>32)";
- }
- } else {
- push @args, "uintptr($name)";
- }
- }
-
- # Determine which form to use; pad args with zeros.
- my $asm = "Syscall";
- if ($nonblock) {
- if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
- $asm = "RawSyscallNoError";
- } else {
- $asm = "RawSyscall";
- }
- } else {
- if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
- $asm = "SyscallNoError";
- }
- }
- if(@args <= 3) {
- while(@args < 3) {
- push @args, "0";
- }
- } elsif(@args <= 6) {
- $asm .= "6";
- while(@args < 6) {
- push @args, "0";
- }
- } elsif(@args <= 9) {
- $asm .= "9";
- while(@args < 9) {
- push @args, "0";
- }
- } else {
- print STDERR "$ARGV:$.: too many arguments to system call\n";
- }
-
- # System call number.
- if($sysname eq "") {
- $sysname = "SYS_$func";
- $sysname =~ s/([a-z])([A-Z])/${1}_$2/g; # turn FooBar into Foo_Bar
- $sysname =~ y/a-z/A-Z/;
- }
-
- # Actual call.
- my $args = join(', ', @args);
- my $call = "$asm($sysname, $args)";
-
- # Assign return values.
- my $body = "";
- my @ret = ("_", "_", "_");
- 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" && !$plan9) {
- $reg = "e1";
- $ret[2] = $reg;
- $do_errno = 1;
- } elsif($name eq "err" && $plan9) {
- $ret[0] = "r0";
- $ret[2] = "e1";
- next;
- } 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" || $plan9) {
- $body .= "\t$name = $type($reg)\n";
- }
- }
- if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
- $text .= "\t$call\n";
- } else {
- if ($errvar eq "" && $ENV{'GOOS'} eq "linux") {
- # raw syscall without error on Linux, see golang.org/issue/22924
- $text .= "\t$ret[0], $ret[1] := $call\n";
- } else {
- $text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
- }
- }
- $text .= $body;
-
- if ($plan9 && $ret[2] eq "e1") {
- $text .= "\tif int32(r0) == -1 {\n";
- $text .= "\t\terr = e1\n";
- $text .= "\t}\n";
- } elsif ($do_errno) {
- $text .= "\tif e1 != 0 {\n";
- $text .= "\t\terr = errnoErr(e1)\n";
- $text .= "\t}\n";
- }
- $text .= "\treturn\n";
- $text .= "}\n\n";
-}
-
-chomp $text;
-chomp $text;
-
-if($errors) {
- exit 1;
-}
-
-print <<EOF;
-// $cmdline
-// Code generated by the command above; see README.md. DO NOT EDIT.
-
-// +build $tags
-
-package unix
-
-import (
- "syscall"
- "unsafe"
-)
-
-var _ syscall.Errno
-
-$text
-EOF
-exit 0;