#! /usr/bin/env perl # Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved. # # Licensed under the Apache License 2.0 (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 ($global); if ($::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 (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 $f ___ } } sub ::dataseg { push(@out,".data\n"); } *::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf); 1;