crypto/perlasm/x86gas.pl - boringssl - Git at Google

 #! /usr/bin/env perl
 # Copyright 2007-2016 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


 package x86gas;

 *out=\@::out;

 $::lbdecor=$::aout?"L":".L";		# local label decoration
 $nmdecor=($::aout or $::coff)?"_":"";	# external name decoration

 $initseg="";

 $align=16;
 $align=log($align)/log(2) if ($::aout);
 $com_start="#" if ($::aout or $::coff);

 sub opsize()
 { my $reg=shift;
     if    ($reg =~ m/^%e/o)		{ "l"; }
     elsif ($reg =~ m/^%[a-d][hl]$/o)	{ "b"; }
     elsif ($reg =~ m/^%[yxm]/o)		{ undef; }
     else				{ "w"; }
 }

 # swap arguments;
 # expand opcode with size suffix;
 # prefix numeric constants with $;
 sub ::generic
 { my($opcode,@arg)=@_;
   my($suffix,$dst,$src);

     @arg=reverse(@arg);

     for (@arg)
     {	s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;	# gp registers
 	s/^([xy]?mm[0-7])$/%$1/o;		# xmm/mmx registers
 	s/^(\-?[0-9]+)$/\$$1/o;			# constants
 	s/^(\-?0x[0-9a-f]+)$/\$$1/o;		# constants
     }

     $dst = $arg[$#arg]		if ($#arg>=0);
     $src = $arg[$#arg-1]	if ($#arg>=1);
     if    ($dst =~ m/^%/o)	{ $suffix=&opsize($dst); }
     elsif ($src =~ m/^%/o)	{ $suffix=&opsize($src); }
     else			{ $suffix="l";           }
     undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);

     if ($#_==0)				{ &::emit($opcode);		}
     elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
 					{ &::emit($opcode,@arg);	}
     else				{ &::emit($opcode.$suffix,@arg);}

   1;
 }
 #
 # opcodes not covered by ::generic above, mostly inconsistent namings...
 #
 sub ::movzx	{ &::movzb(@_);			}
 sub ::pushfd	{ &::pushfl;			}
 sub ::popfd	{ &::popfl;			}
 sub ::cpuid	{ &::emit(".byte\t0x0f,0xa2");	}
 sub ::rdtsc	{ &::emit(".byte\t0x0f,0x31");	}

 sub ::call	{ &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
 sub ::call_ptr	{ &::generic("call","*$_[0]");	}
 sub ::jmp_ptr	{ &::generic("jmp","*$_[0]");	}

 *::bswap = sub	{ &::emit("bswap","%$_[0]");	} if (!$::i386);

 sub ::DWP
 { my($addr,$reg1,$reg2,$idx)=@_;
   my $ret="";

     if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }

     $addr =~ s/^\s+//;
     # prepend global references with optional underscore
     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;

     $reg1 = "%$reg1" if ($reg1);
     $reg2 = "%$reg2" if ($reg2);

     $ret .= $addr if (($addr ne "") && ($addr ne 0));

     if ($reg2)
     {	$idx!= 0 or $idx=1;
 	$ret .= "($reg1,$reg2,$idx)";
     }
     elsif ($reg1)
     {	$ret .= "($reg1)";	}

   $ret;
 }
 sub ::QWP	{ &::DWP(@_);	}
 sub ::BP	{ &::DWP(@_);	}
 sub ::WP	{ &::DWP(@_);	}
 sub ::BC	{ @_;		}
 sub ::DWC	{ @_;		}

 sub ::file
 {   push(@out,".text\n");	}

 sub ::function_begin_B
 { my $func=shift;
   my $global=($func !~ /^_/);
   my $begin="${::lbdecor}_${func}_begin";

     &::LABEL($func,$global?"$begin":"$nmdecor$func");
     $func=$nmdecor.$func;

     push(@out,".globl\t$func\n")	if ($global);
     if ($::macosx) {
       push(@out,".private_extern\t$func\n");
     } else {
       push(@out,".hidden\t$func\n");
     }
     if ($::coff)
     {	push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
     elsif (($::aout and !$::pic) or $::macosx)
     { }
     else
     {	push(@out,".type	$func,\@function\n"); }
     push(@out,".align\t$align\n");
     push(@out,"$func:\n");
     push(@out,"$begin:\n")		if ($global);
     $::stack=4;
 }

 sub ::function_end_B
 { my $func=shift;
     push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
     $::stack=0;
     &::wipe_labels();
 }

 sub ::comment
 	{
 	if (!defined($com_start) or $::elf)
 		{	# Regarding $::elf above...
 			# GNU and SVR4 as'es use different comment delimiters,
 		push(@out,"\n");	# so we just skip ELF comments...
 		return;
 		}
 	foreach (@_)
 		{
 		if (/^\s*$/)
 			{ push(@out,"\n"); }
 		else
 			{ push(@out,"\t$com_start $_ $com_end\n"); }
 		}
 	}

 sub ::external_label
 {   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }

 sub ::public_label
 {   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }

 sub ::file_end
 {   if ($::macosx)
     {	if (%non_lazy_ptr)
     	{   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
 	    foreach $i (keys %non_lazy_ptr)
 	    {	push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
 	}
     }
     if (0 && grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
 	my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
 	if ($::macosx)	{ push (@out,"$tmp,2\n"); }
 	elsif ($::elf)	{ push (@out,"$tmp,4\n"); }
 	else		{ push (@out,"$tmp\n"); }
     }
     push(@out,$initseg) if ($initseg);
 }

 sub ::data_byte	{   push(@out,".byte\t".join(',',@_)."\n");   }
 sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
 sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }

 sub ::align
 { my $val=$_[0];
     if ($::aout)
     {	$val=int(log($val)/log(2));
 	$val.=",0x90";
     }
     push(@out,".align\t$val\n");
 }

 sub ::picmeup
 { my($dst,$sym,$base,$reflabel)=@_;

     if (($::pic && ($::elf || $::aout)) || $::macosx)
     {	if (!defined($base))
 	{   &::call(&::label("PIC_me_up"));
 	    &::set_label("PIC_me_up");
 	    &::blindpop($dst);
 	    $base=$dst;
 	    $reflabel=&::label("PIC_me_up");
 	}
 	if ($::macosx)
 	{   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
 	    &::mov($dst,&::DWP("$indirect-$reflabel",$base));
 	    $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
 	}
 	elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
 	{   &::lea($dst,&::DWP("$sym-$reflabel",$base));   }
 	else
 	{   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
 			    $base));
 	    &::mov($dst,&::DWP("$sym\@GOT",$dst));
 	}
     }
     else
     {	&::lea($dst,&::DWP($sym));	}
 }

 sub ::initseg
 { my $f=$nmdecor.shift;

     if ($::android)
     {	$initseg.=<<___;
 .section	.init_array
 .align	4
 .long	$f
 ___
     }
     elsif ($::elf)
     {	$initseg.=<<___;
 .section	.init
 	call	$f
 ___
     }
     elsif ($::coff)
     {   $initseg.=<<___;	# applies to both Cygwin and Mingw
 .section	.ctors
 .long	$f
 ___
     }
     elsif ($::macosx)
     {	$initseg.=<<___;
 .mod_init_func
 .align 2
 .long   $f
 ___
     }
     elsif ($::aout)
     {	my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
 	$initseg.=".text\n";
 	$initseg.=".type	$ctor,\@function\n" if ($::pic);
 	$initseg.=<<___;	# OpenBSD way...
 .globl	$ctor
 .align	2
 $ctor:
 	jmp	$f
 ___
     }
 }

 sub ::dataseg
 {   push(@out,".data\n");   }

 sub ::preprocessor_ifdef
 { my($define)=@_;
     push(@out,"#ifdef ${define}\n");
 }

 sub ::preprocessor_endif
 { push(@out,"#endif\n");    }

 *::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);

 1;
	#! /usr/bin/env perl
	# Copyright 2007-2016 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


	package x86gas;

	*out=\@::out;

	$::lbdecor=$::aout?"L":".L"; # local label decoration
	$nmdecor=($::aout or $::coff)?"_":""; # external name decoration

	$initseg="";

	$align=16;
	$align=log($align)/log(2) if ($::aout);
	$com_start="#" if ($::aout or $::coff);

	sub opsize()
	{ my $reg=shift;
	if ($reg =~ m/^%e/o) { "l"; }
	elsif ($reg =~ m/^%[a-d][hl]$/o) { "b"; }
	elsif ($reg =~ m/^%[yxm]/o) { undef; }
	else { "w"; }
	}

	# swap arguments;
	# expand opcode with size suffix;
	# prefix numeric constants with $;
	sub ::generic
	{ my($opcode,@arg)=@_;
	my($suffix,$dst,$src);

	@arg=reverse(@arg);

	for (@arg)
	{ s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o; # gp registers
	s/^([xy]?mm[0-7])$/%$1/o; # xmm/mmx registers
	s/^(\-?[0-9]+)$/\$$1/o; # constants
	s/^(\-?0x[0-9a-f]+)$/\$$1/o; # constants
	}

	$dst = $arg[$#arg] if ($#arg>=0);
	$src = $arg[$#arg-1] if ($#arg>=1);
	if ($dst =~ m/^%/o) { $suffix=&opsize($dst); }
	elsif ($src =~ m/^%/o) { $suffix=&opsize($src); }
	else { $suffix="l"; }
	undef $suffix if ($dst =~ m/^%[xm]/o \|\| $src =~ m/^%[xm]/o);

	if ($#_==0) { &::emit($opcode); }
	elsif ($#_==1 && $opcode =~ m/^(call\|clflush\|j\|loop\|set)/o)
	{ &::emit($opcode,@arg); }
	else { &::emit($opcode.$suffix,@arg);}

	1;
	}
	#
	# opcodes not covered by ::generic above, mostly inconsistent namings...
	#
	sub ::movzx { &::movzb(@_); }
	sub ::pushfd { &::pushfl; }
	sub ::popfd { &::popfl; }
	sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); }
	sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); }

	sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
	sub ::call_ptr { &::generic("call","*$_[0]"); }
	sub ::jmp_ptr { &::generic("jmp","*$_[0]"); }

	*::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386);

	sub ::DWP
	{ my($addr,$reg1,$reg2,$idx)=@_;
	my $ret="";

	if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }

	$addr =~ s/^\s+//;
	# prepend global references with optional underscore
	$addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;

	$reg1 = "%$reg1" if ($reg1);
	$reg2 = "%$reg2" if ($reg2);

	$ret .= $addr if (($addr ne "") && ($addr ne 0));

	if ($reg2)
	{ $idx!= 0 or $idx=1;
	$ret .= "($reg1,$reg2,$idx)";
	}
	elsif ($reg1)
	{ $ret .= "($reg1)"; }

	$ret;
	}
	sub ::QWP { &::DWP(@_); }
	sub ::BP { &::DWP(@_); }
	sub ::WP { &::DWP(@_); }
	sub ::BC { @_; }
	sub ::DWC { @_; }

	sub ::file
	{ push(@out,".text\n"); }

	sub ::function_begin_B
	{ my $func=shift;
	my $global=($func !~ /^_/);
	my $begin="${::lbdecor}_${func}_begin";

	&::LABEL($func,$global?"$begin":"$nmdecor$func");
	$func=$nmdecor.$func;

	push(@out,".globl\t$func\n") if ($global);
	if ($::macosx) {
	push(@out,".private_extern\t$func\n");
	} else {
	push(@out,".hidden\t$func\n");
	}
	if ($::coff)
	{ push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
	elsif (($::aout and !$::pic) or $::macosx)
	{ }
	else
	{ push(@out,".type $func,\@function\n"); }
	push(@out,".align\t$align\n");
	push(@out,"$func:\n");
	push(@out,"$begin:\n") if ($global);
	$::stack=4;
	}

	sub ::function_end_B
	{ my $func=shift;
	push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
	$::stack=0;
	&::wipe_labels();
	}

	sub ::comment
	{
	if (!defined($com_start) or $::elf)
	{ # Regarding $::elf above...
	# GNU and SVR4 as'es use different comment delimiters,
	push(@out,"\n"); # so we just skip ELF comments...
	return;
	}
	foreach (@_)
	{
	if (/^\s*$/)
	{ push(@out,"\n"); }
	else
	{ push(@out,"\t$com_start $_ $com_end\n"); }
	}
	}

	sub ::external_label
	{ foreach(@_) { &::LABEL($_,$nmdecor.$_); } }

	sub ::public_label
	{ push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }

	sub ::file_end
	{ if ($::macosx)
	{ if (%non_lazy_ptr)
	{ push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
	foreach $i (keys %non_lazy_ptr)
	{ push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); }
	}
	}
	if (0 && grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
	my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
	if ($::macosx) { push (@out,"$tmp,2\n"); }
	elsif ($::elf) { push (@out,"$tmp,4\n"); }
	else { push (@out,"$tmp\n"); }
	}
	push(@out,$initseg) if ($initseg);
	}

	sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); }
	sub ::data_short{ push(@out,".value\t".join(',',@_)."\n"); }
	sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); }

	sub ::align
	{ my $val=$_[0];
	if ($::aout)
	{ $val=int(log($val)/log(2));
	$val.=",0x90";
	}
	push(@out,".align\t$val\n");
	}

	sub ::picmeup
	{ my($dst,$sym,$base,$reflabel)=@_;

	if (($::pic && ($::elf \|\| $::aout)) \|\| $::macosx)
	{ if (!defined($base))
	{ &::call(&::label("PIC_me_up"));
	&::set_label("PIC_me_up");
	&::blindpop($dst);
	$base=$dst;
	$reflabel=&::label("PIC_me_up");
	}
	if ($::macosx)
	{ my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
	&::mov($dst,&::DWP("$indirect-$reflabel",$base));
	$non_lazy_ptr{"$nmdecor$sym"}=$indirect;
	}
	elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
	{ &::lea($dst,&::DWP("$sym-$reflabel",$base)); }
	else
	{ &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
	$base));
	&::mov($dst,&::DWP("$sym\@GOT",$dst));
	}
	}
	else
	{ &::lea($dst,&::DWP($sym)); }
	}

	sub ::initseg
	{ my $f=$nmdecor.shift;

	if ($::android)
	{ $initseg.=<<___;
	.section .init_array
	.align 4
	.long $f
	___
	}
	elsif ($::elf)
	{ $initseg.=<<___;
	.section .init
	call $f
	___
	}
	elsif ($::coff)
	{ $initseg.=<<___; # applies to both Cygwin and Mingw
	.section .ctors
	.long $f
	___
	}
	elsif ($::macosx)
	{ $initseg.=<<___;
	.mod_init_func
	.align 2
	.long $f
	___
	}
	elsif ($::aout)
	{ my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
	$initseg.=".text\n";
	$initseg.=".type $ctor,\@function\n" if ($::pic);
	$initseg.=<<___; # OpenBSD way...
	.globl $ctor
	.align 2
	$ctor:
	jmp $f
	___
	}
	}

	sub ::dataseg
	{ push(@out,".data\n"); }

	sub ::preprocessor_ifdef
	{ my($define)=@_;
	push(@out,"#ifdef ${define}\n");
	}

	sub ::preprocessor_endif
	{ push(@out,"#endif\n"); }

	*::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);

	1;