crypto/perlasm/x86asm.pl - boringssl - Git at Google

 #! /usr/bin/env perl
 # Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
 #
 # Licensed under the OpenSSL license (the "License").  You may not use
 # this file except in compliance with the License.  You can obtain a copy
 # in the file LICENSE in the source distribution or at
 # https://www.openssl.org/source/license.html


 # require 'x86asm.pl';
 # &asm_init(<flavor>[,$i386only]);
 # &function_begin("foo");
 # ...
 # &function_end("foo");
 # &asm_finish

 $out=();
 $i386=0;

 # AUTOLOAD is this context has quite unpleasant side effect, namely
 # that typos in function calls effectively go to assembler output,
 # but on the pros side we don't have to implement one subroutine per
 # each opcode...
 sub ::AUTOLOAD
 { my $opcode = $AUTOLOAD;

     die "more than 4 arguments passed to $opcode" if ($#_>3);

     $opcode =~ s/.*:://;
     if    ($opcode =~ /^push/) { $stack+=4; }
     elsif ($opcode =~ /^pop/)  { $stack-=4; }

     &generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
 }

 # record_function_hit(int) writes a byte with value one to the given offset of
 # |BORINGSSL_function_hit|, but only if BORINGSSL_DISPATCH_TEST is defined.
 # This is used in impl_dispatch_test.cc to test whether the expected assembly
 # functions are triggered by high-level API calls.
 sub ::record_function_hit
 { my($index)=@_;
     &preprocessor_ifdef("BORINGSSL_DISPATCH_TEST");
     &push("ebx");
     &push("edx");
     &call(&label("pic"));
     &set_label("pic");
     &blindpop("ebx");
     &lea("ebx",&DWP("BORINGSSL_function_hit+$index"."-".&label("pic"),"ebx"));
     &mov("edx", 1);
     &movb(&BP(0, "ebx"), "dl");
     &pop("edx");
     &pop("ebx");
     &preprocessor_endif();
 }

 sub ::emit
 { my $opcode=shift;

     if ($#_==-1)    { push(@out,"\t$opcode\n");				}
     else            { push(@out,"\t$opcode\t".join(',',@_)."\n");	}
 }

 sub ::LB
 {   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
   $1."l";
 }
 sub ::HB
 {   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
   $1."h";
 }
 sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num);	}
 sub ::stack_pop	{ my $num=$_[0]*4; $stack-=$num; &add("esp",$num);	}
 sub ::blindpop	{ &pop($_[0]); $stack+=4;				}
 sub ::wparam	{ &DWP($stack+4*$_[0],"esp");				}
 sub ::swtmp	{ &DWP(4*$_[0],"esp");					}

 sub ::bswap
 {   if ($i386)	# emulate bswap for i386
     {	&comment("bswap @_");
 	&xchg(&HB(@_),&LB(@_));
 	&ror (@_,16);
 	&xchg(&HB(@_),&LB(@_));
     }
     else
     {	&generic("bswap",@_);	}
 }
 # These are made-up opcodes introduced over the years essentially
 # by ignorance, just alias them to real ones...
 sub ::movb	{ &mov(@_);	}
 sub ::xorb	{ &xor(@_);	}
 sub ::rotl	{ &rol(@_);	}
 sub ::rotr	{ &ror(@_);	}
 sub ::exch	{ &xchg(@_);	}
 sub ::halt	{ &hlt;		}
 sub ::movz	{ &movzx(@_);	}
 sub ::pushf	{ &pushfd;	}
 sub ::popf	{ &popfd;	}

 # 3 argument instructions
 sub ::movq
 { my($p1,$p2,$optimize)=@_;

     if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
     # movq between mmx registers can sink Intel CPUs
     {	&::pshufw($p1,$p2,0xe4);		}
     else
     {	&::generic("movq",@_);			}
 }

 # SSE>2 instructions
 my %regrm = (	"eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
 		"esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7	);
 sub ::pextrd
 { my($dst,$src,$imm)=@_;
     if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
     {	&::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm);	}
     else
     {	&::generic("pextrd",@_);		}
 }

 sub ::pinsrd
 { my($dst,$src,$imm)=@_;
     if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
     {	&::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm);	}
     else
     {	&::generic("pinsrd",@_);		}
 }

 sub ::pshufb
 { my($dst,$src)=@_;
     if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
     {	&data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2);	}
     else
     {	&::generic("pshufb",@_);		}
 }

 sub ::palignr
 { my($dst,$src,$imm)=@_;
     if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
     {	&::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm);	}
     else
     {	&::generic("palignr",@_);		}
 }

 sub ::pclmulqdq
 { my($dst,$src,$imm)=@_;
     if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
     {	&::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm);	}
     else
     {	&::generic("pclmulqdq",@_);		}
 }

 sub ::rdrand
 { my ($dst)=@_;
     if ($dst =~ /(e[a-dsd][ixp])/)
     {	&::data_byte(0x0f,0xc7,0xf0|$regrm{$dst});	}
     else
     {	&::generic("rdrand",@_);	}
 }

 sub ::rdseed
 { my ($dst)=@_;
     if ($dst =~ /(e[a-dsd][ixp])/)
     {	&::data_byte(0x0f,0xc7,0xf8|$regrm{$dst});	}
     else
     {	&::generic("rdrand",@_);	}
 }

 sub rxb {
  local *opcode=shift;
  my ($dst,$src1,$src2,$rxb)=@_;

    $rxb|=0x7<<5;
    $rxb&=~(0x04<<5) if($dst>=8);
    $rxb&=~(0x01<<5) if($src1>=8);
    $rxb&=~(0x02<<5) if($src2>=8);
    push @opcode,$rxb;
 }

 sub ::vprotd
 { my $args=join(',',@_);
     if ($args =~ /xmm([0-7]),xmm([0-7]),([x0-9a-f]+)/)
     { my @opcode=(0x8f);
 	rxb(\@opcode,$1,$2,-1,0x08);
 	push @opcode,0x78,0xc2;
 	push @opcode,0xc0|($2&7)|(($1&7)<<3);		# ModR/M
 	my $c=$3;
 	push @opcode,$c=~/^0/?oct($c):$c;
 	&::data_byte(@opcode);
     }
     else
     {	&::generic("vprotd",@_);	}
 }

 sub ::endbranch
 {
     &::data_byte(0xf3,0x0f,0x1e,0xfb);
 }

 # label management
 $lbdecor="L";		# local label decoration, set by package
 $label="000";

 sub ::islabel		# see is argument is a known label
 { my $i;
     foreach $i (values %label) { return $i if ($i eq $_[0]); }
   $label{$_[0]};	# can be undef
 }

 sub ::label		# instantiate a function-scope label
 {   if (!defined($label{$_[0]}))
     {	$label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
   $label{$_[0]};
 }

 sub ::LABEL		# instantiate a file-scope label
 {   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
   $label{$_[0]};
 }

 sub ::static_label	{ &::LABEL($_[0],$lbdecor.$_[0]); }

 sub ::set_label_B	{ push(@out,"@_:\n"); }
 sub ::set_label
 { my $label=&::label($_[0]);
     &::align($_[1]) if ($_[1]>1);
     &::set_label_B($label);
   $label;
 }

 sub ::wipe_labels	# wipes function-scope labels
 {   foreach $i (keys %label)
     {	delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/);	}
 }

 # subroutine management
 sub ::function_begin
 {   &function_begin_B(@_);
     $stack=4;
     &push("ebp");
     &push("ebx");
     &push("esi");
     &push("edi");
 }

 sub ::function_end
 {   &pop("edi");
     &pop("esi");
     &pop("ebx");
     &pop("ebp");
     &ret();
     &function_end_B(@_);
     $stack=0;
     &wipe_labels();
 }

 sub ::function_end_A
 {   &pop("edi");
     &pop("esi");
     &pop("ebx");
     &pop("ebp");
     &ret();
     $stack+=16;	# readjust esp as if we didn't pop anything
 }

 sub ::asciz
 { my @str=unpack("C*",shift);
     push @str,0;
     while ($#str>15) {
 	&data_byte(@str[0..15]);
 	foreach (0..15) { shift @str; }
     }
     &data_byte(@str) if (@str);
 }

 sub ::asm_finish
 {   &file_end();
     my $comment = "//";
     $comment = ";" if ($win32);
     print <<___;
 $comment This file is generated from a similarly-named Perl script in the BoringSSL
 $comment source tree. Do not edit by hand.

 ___
     if ($win32) {
         print <<___ unless $masm;
 \%ifdef BORINGSSL_PREFIX
 \%include "boringssl_prefix_symbols_nasm.inc"
 \%endif
 \%ifidn __OUTPUT_FORMAT__, win32
 ___
         print @out;
         print <<___ unless $masm;
 \%else
 ; Work around https://bugzilla.nasm.us/show_bug.cgi?id=3392738
 ret
 \%endif
 ___
     } else {
         my $target;
         if ($elf) {
             $target = "defined(__ELF__)";
         } elsif ($macosx) {
             $target = "defined(__APPLE__)";
         } else {
             die "unknown target";
         }

         print <<___;
 #if defined(__has_feature)
 #if __has_feature(memory_sanitizer) && !defined(OPENSSL_NO_ASM)
 #define OPENSSL_NO_ASM
 #endif
 #endif

 #if !defined(OPENSSL_NO_ASM) && defined(__i386__) && $target
 #if defined(BORINGSSL_PREFIX)
 #include <boringssl_prefix_symbols_asm.h>
 #endif
 ___
         print @out;
         print <<___;
 #endif  // !defined(OPENSSL_NO_ASM) && defined(__i386__) && $target
 #if defined(__ELF__)
 // See https://www.airs.com/blog/archives/518.
 .section .note.GNU-stack,"",\%progbits
 #endif
 ___
     }
 }

 sub ::asm_init
 { my ($type,$cpu)=@_;

     $i386=$cpu;

     $elf=$cpp=$coff=$aout=$macosx=$win32=$mwerks=$android=0;
     if    (($type eq "elf"))
     {	$elf=1;			require "x86gas.pl";	}
     elsif (($type eq "elf-1"))
     {	$elf=-1;		require "x86gas.pl";	}
     elsif (($type eq "a\.out"))
     {	$aout=1;		require "x86gas.pl";	}
     elsif (($type eq "coff" or $type eq "gaswin"))
     {	$coff=1;		require "x86gas.pl";	}
     elsif (($type eq "win32n"))
     {	$win32=1;		require "x86nasm.pl";	}
     elsif (($type eq "win32"))
     {	$win32=1; $masm=1;	require "x86masm.pl";	}
     elsif (($type eq "macosx"))
     {	$aout=1; $macosx=1;	require "x86gas.pl";	}
     elsif (($type eq "android"))
     {	$elf=1; $android=1;	require "x86gas.pl";	}
     else
     {	print STDERR <<"EOF";
 Pick one target type from
 	elf	- Linux, FreeBSD, Solaris x86, etc.
 	a.out	- DJGPP, elder OpenBSD, etc.
 	coff	- GAS/COFF such as Win32 targets
 	win32n	- Windows 95/Windows NT NASM format
 	macosx	- Mac OS X
 EOF
 	exit(1);
     }

     $pic=0;
     for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }

     &file();
 }

 sub ::hidden {}

 1;
	#! /usr/bin/env perl
	# Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
	#
	# Licensed under the OpenSSL license (the "License"). You may not use
	# this file except in compliance with the License. You can obtain a copy
	# in the file LICENSE in the source distribution or at
	# https://www.openssl.org/source/license.html


	# require 'x86asm.pl';
	# &asm_init(<flavor>[,$i386only]);
	# &function_begin("foo");
	# ...
	# &function_end("foo");
	# &asm_finish

	$out=();
	$i386=0;

	# AUTOLOAD is this context has quite unpleasant side effect, namely
	# that typos in function calls effectively go to assembler output,
	# but on the pros side we don't have to implement one subroutine per
	# each opcode...
	sub ::AUTOLOAD
	{ my $opcode = $AUTOLOAD;

	die "more than 4 arguments passed to $opcode" if ($#_>3);

	$opcode =~ s/.*:://;
	if ($opcode =~ /^push/) { $stack+=4; }
	elsif ($opcode =~ /^pop/) { $stack-=4; }

	&generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
	}

	# record_function_hit(int) writes a byte with value one to the given offset of
	# \|BORINGSSL_function_hit\|, but only if BORINGSSL_DISPATCH_TEST is defined.
	# This is used in impl_dispatch_test.cc to test whether the expected assembly
	# functions are triggered by high-level API calls.
	sub ::record_function_hit
	{ my($index)=@_;
	&preprocessor_ifdef("BORINGSSL_DISPATCH_TEST");
	&push("ebx");
	&push("edx");
	&call(&label("pic"));
	&set_label("pic");
	&blindpop("ebx");
	&lea("ebx",&DWP("BORINGSSL_function_hit+$index"."-".&label("pic"),"ebx"));
	&mov("edx", 1);
	&movb(&BP(0, "ebx"), "dl");
	&pop("edx");
	&pop("ebx");
	&preprocessor_endif();
	}

	sub ::emit
	{ my $opcode=shift;

	if ($#_==-1) { push(@out,"\t$opcode\n"); }
	else { push(@out,"\t$opcode\t".join(',',@_)."\n"); }
	}

	sub ::LB
	{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
	$1."l";
	}
	sub ::HB
	{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
	$1."h";
	}
	sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); }
	sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); }
	sub ::blindpop { &pop($_[0]); $stack+=4; }
	sub ::wparam { &DWP($stack+4*$_[0],"esp"); }
	sub ::swtmp { &DWP(4*$_[0],"esp"); }

	sub ::bswap
	{ if ($i386) # emulate bswap for i386
	{ &comment("bswap @_");
	&xchg(&HB(@_),&LB(@_));
	&ror (@_,16);
	&xchg(&HB(@_),&LB(@_));
	}
	else
	{ &generic("bswap",@_); }
	}
	# These are made-up opcodes introduced over the years essentially
	# by ignorance, just alias them to real ones...
	sub ::movb { &mov(@_); }
	sub ::xorb { &xor(@_); }
	sub ::rotl { &rol(@_); }
	sub ::rotr { &ror(@_); }
	sub ::exch { &xchg(@_); }
	sub ::halt { &hlt; }
	sub ::movz { &movzx(@_); }
	sub ::pushf { &pushfd; }
	sub ::popf { &popfd; }

	# 3 argument instructions
	sub ::movq
	{ my($p1,$p2,$optimize)=@_;

	if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
	# movq between mmx registers can sink Intel CPUs
	{ &::pshufw($p1,$p2,0xe4); }
	else
	{ &::generic("movq",@_); }
	}

	# SSE>2 instructions
	my %regrm = ( "eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
	"esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7 );
	sub ::pextrd
	{ my($dst,$src,$imm)=@_;
	if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
	{ &::data_byte(0x66,0x0f,0x3a,0x16,0xc0\|($2<<3)\|$regrm{$1},$imm); }
	else
	{ &::generic("pextrd",@_); }
	}

	sub ::pinsrd
	{ my($dst,$src,$imm)=@_;
	if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
	{ &::data_byte(0x66,0x0f,0x3a,0x22,0xc0\|($1<<3)\|$regrm{$2},$imm); }
	else
	{ &::generic("pinsrd",@_); }
	}

	sub ::pshufb
	{ my($dst,$src)=@_;
	if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
	{ &data_byte(0x66,0x0f,0x38,0x00,0xc0\|($1<<3)\|$2); }
	else
	{ &::generic("pshufb",@_); }
	}

	sub ::palignr
	{ my($dst,$src,$imm)=@_;
	if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
	{ &::data_byte(0x66,0x0f,0x3a,0x0f,0xc0\|($1<<3)\|$2,$imm); }
	else
	{ &::generic("palignr",@_); }
	}

	sub ::pclmulqdq
	{ my($dst,$src,$imm)=@_;
	if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
	{ &::data_byte(0x66,0x0f,0x3a,0x44,0xc0\|($1<<3)\|$2,$imm); }
	else
	{ &::generic("pclmulqdq",@_); }
	}

	sub ::rdrand
	{ my ($dst)=@_;
	if ($dst =~ /(e[a-dsd][ixp])/)
	{ &::data_byte(0x0f,0xc7,0xf0\|$regrm{$dst}); }
	else
	{ &::generic("rdrand",@_); }
	}

	sub ::rdseed
	{ my ($dst)=@_;
	if ($dst =~ /(e[a-dsd][ixp])/)
	{ &::data_byte(0x0f,0xc7,0xf8\|$regrm{$dst}); }
	else
	{ &::generic("rdrand",@_); }
	}

	sub rxb {
	local *opcode=shift;
	my ($dst,$src1,$src2,$rxb)=@_;

	$rxb\|=0x7<<5;
	$rxb&=~(0x04<<5) if($dst>=8);
	$rxb&=~(0x01<<5) if($src1>=8);
	$rxb&=~(0x02<<5) if($src2>=8);
	push @opcode,$rxb;
	}

	sub ::vprotd
	{ my $args=join(',',@_);
	if ($args =~ /xmm([0-7]),xmm([0-7]),([x0-9a-f]+)/)
	{ my @opcode=(0x8f);
	rxb(\@opcode,$1,$2,-1,0x08);
	push @opcode,0x78,0xc2;
	push @opcode,0xc0\|($2&7)\|(($1&7)<<3); # ModR/M
	my $c=$3;
	push @opcode,$c=~/^0/?oct($c):$c;
	&::data_byte(@opcode);
	}
	else
	{ &::generic("vprotd",@_); }
	}

	sub ::endbranch
	{
	&::data_byte(0xf3,0x0f,0x1e,0xfb);
	}

	# label management
	$lbdecor="L"; # local label decoration, set by package
	$label="000";

	sub ::islabel # see is argument is a known label
	{ my $i;
	foreach $i (values %label) { return $i if ($i eq $_[0]); }
	$label{$_[0]}; # can be undef
	}

	sub ::label # instantiate a function-scope label
	{ if (!defined($label{$_[0]}))
	{ $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; }
	$label{$_[0]};
	}

	sub ::LABEL # instantiate a file-scope label
	{ $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
	$label{$_[0]};
	}

	sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); }

	sub ::set_label_B { push(@out,"@_:\n"); }
	sub ::set_label
	{ my $label=&::label($_[0]);
	&::align($_[1]) if ($_[1]>1);
	&::set_label_B($label);
	$label;
	}

	sub ::wipe_labels # wipes function-scope labels
	{ foreach $i (keys %label)
	{ delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
	}

	# subroutine management
	sub ::function_begin
	{ &function_begin_B(@_);
	$stack=4;
	&push("ebp");
	&push("ebx");
	&push("esi");
	&push("edi");
	}

	sub ::function_end
	{ &pop("edi");
	&pop("esi");
	&pop("ebx");
	&pop("ebp");
	&ret();
	&function_end_B(@_);
	$stack=0;
	&wipe_labels();
	}

	sub ::function_end_A
	{ &pop("edi");
	&pop("esi");
	&pop("ebx");
	&pop("ebp");
	&ret();
	$stack+=16; # readjust esp as if we didn't pop anything
	}

	sub ::asciz
	{ my @str=unpack("C*",shift);
	push @str,0;
	while ($#str>15) {
	&data_byte(@str[0..15]);
	foreach (0..15) { shift @str; }
	}
	&data_byte(@str) if (@str);
	}

	sub ::asm_finish
	{ &file_end();
	my $comment = "//";
	$comment = ";" if ($win32);
	print <<___;
	$comment This file is generated from a similarly-named Perl script in the BoringSSL
	$comment source tree. Do not edit by hand.

	___
	if ($win32) {
	print <<___ unless $masm;
	\%ifdef BORINGSSL_PREFIX
	\%include "boringssl_prefix_symbols_nasm.inc"
	\%endif
	\%ifidn __OUTPUT_FORMAT__, win32
	___
	print @out;
	print <<___ unless $masm;
	\%else
	; Work around https://bugzilla.nasm.us/show_bug.cgi?id=3392738
	ret
	\%endif
	___
	} else {
	my $target;
	if ($elf) {
	$target = "defined(__ELF__)";
	} elsif ($macosx) {
	$target = "defined(__APPLE__)";
	} else {
	die "unknown target";
	}

	print <<___;
	#if defined(__has_feature)
	#if __has_feature(memory_sanitizer) && !defined(OPENSSL_NO_ASM)
	#define OPENSSL_NO_ASM
	#endif
	#endif

	#if !defined(OPENSSL_NO_ASM) && defined(__i386__) && $target
	#if defined(BORINGSSL_PREFIX)
	#include <boringssl_prefix_symbols_asm.h>
	#endif
	___
	print @out;
	print <<___;
	#endif // !defined(OPENSSL_NO_ASM) && defined(__i386__) && $target
	#if defined(__ELF__)
	// See https://www.airs.com/blog/archives/518.
	.section .note.GNU-stack,"",\%progbits
	#endif
	___
	}
	}

	sub ::asm_init
	{ my ($type,$cpu)=@_;

	$i386=$cpu;

	$elf=$cpp=$coff=$aout=$macosx=$win32=$mwerks=$android=0;
	if (($type eq "elf"))
	{ $elf=1; require "x86gas.pl"; }
	elsif (($type eq "elf-1"))
	{ $elf=-1; require "x86gas.pl"; }
	elsif (($type eq "a\.out"))
	{ $aout=1; require "x86gas.pl"; }
	elsif (($type eq "coff" or $type eq "gaswin"))
	{ $coff=1; require "x86gas.pl"; }
	elsif (($type eq "win32n"))
	{ $win32=1; require "x86nasm.pl"; }
	elsif (($type eq "win32"))
	{ $win32=1; $masm=1; require "x86masm.pl"; }
	elsif (($type eq "macosx"))
	{ $aout=1; $macosx=1; require "x86gas.pl"; }
	elsif (($type eq "android"))
	{ $elf=1; $android=1; require "x86gas.pl"; }
	else
	{ print STDERR <<"EOF";
	Pick one target type from
	elf - Linux, FreeBSD, Solaris x86, etc.
	a.out - DJGPP, elder OpenBSD, etc.
	coff - GAS/COFF such as Win32 targets
	win32n - Windows 95/Windows NT NASM format
	macosx - Mac OS X
	EOF
	exit(1);
	}

	$pic=0;
	for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }

	&file();
	}

	sub ::hidden {}

	1;