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#! /usr/bin/env perl
# Copyright 2007-2020 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);
&::endbranch();
$::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 ($initseg);
if ($::elf) {
push(@out,"
.section \".note.gnu.property\", \"a\"
.p2align 2
.long 1f - 0f
.long 4f - 1f
.long 5
0:
.asciz \"GNU\"
1:
.p2align 2
.long 0xc0000002
.long 3f - 2f
2:
.long 3
3:
.p2align 2
4:
");
}
}
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;
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