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#! /usr/bin/env perl
# Copyright 1999-2018 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 x86nasm;
*out=\@::out;
$::lbdecor="L\$"; # local label decoration
$nmdecor="_"; # external name decoration
$drdecor=$::mwerks?".":""; # directive decoration
$initseg="";
sub ::generic
{ my $opcode=shift;
my $tmp;
if (!$::mwerks)
{ if ($opcode =~ m/^j/o && $#_==0) # optimize jumps
{ $_[0] = "NEAR $_[0]"; }
elsif ($opcode eq "lea" && $#_==1) # wipe storage qualifier from lea
{ $_[1] =~ s/^[^\[]*\[/\[/o; }
elsif ($opcode eq "clflush" && $#_==0)
{ $_[0] =~ s/^[^\[]*\[/\[/o; }
}
&::emit($opcode,@_);
1;
}
#
# opcodes not covered by ::generic above, mostly inconsistent namings...
#
sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
sub ::call_ptr { &::emit("call",@_); }
sub ::jmp_ptr { &::emit("jmp",@_); }
sub get_mem
{ my($size,$addr,$reg1,$reg2,$idx)=@_;
my($post,$ret);
if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
if ($size ne "")
{ $ret .= "$size";
$ret .= " PTR" if ($::mwerks);
$ret .= " ";
}
$ret .= "[";
$addr =~ s/^\s+//;
# prepend global references with optional underscore
$addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige;
# put address arithmetic expression in parenthesis
$addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
if (($addr ne "") && ($addr ne 0))
{ if ($addr !~ /^-/) { $ret .= "$addr+"; }
else { $post=$addr; }
}
if ($reg2 ne "")
{ $idx!=0 or $idx=1;
$ret .= "$reg2*$idx";
$ret .= "+$reg1" if ($reg1 ne "");
}
else
{ $ret .= "$reg1"; }
$ret .= "$post]";
$ret =~ s/\+\]/]/; # in case $addr was the only argument
$ret;
}
sub ::BP { &get_mem("BYTE",@_); }
sub ::DWP { &get_mem("DWORD",@_); }
sub ::WP { &get_mem("WORD",@_); }
sub ::QWP { &get_mem("",@_); }
sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; }
sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; }
sub ::file
{ if ($::mwerks) { push(@out,".section\t.text,64\n"); }
else
{ my $tmp=<<___;
%ifidn __OUTPUT_FORMAT__,obj
section code use32 class=code align=64
%elifidn __OUTPUT_FORMAT__,win32
\$\@feat.00 equ 1
section .text code align=64
%else
section .text code
%endif
___
push(@out,$tmp);
}
}
sub ::function_begin_B
{ my $func=shift;
my $global=($func !~ /^_/);
my $begin="${::lbdecor}_${func}_begin";
$begin =~ s/^\@/./ if ($::mwerks); # the torture never stops
&::LABEL($func,$global?"$begin":"$nmdecor$func");
$func=$nmdecor.$func;
push(@out,"${drdecor}global $func\n") if ($global);
push(@out,"${drdecor}align 16\n");
push(@out,"$func:\n");
push(@out,"$begin:\n") if ($global);
$::stack=4;
}
sub ::function_end_B
{ $::stack=0;
&::wipe_labels();
}
sub ::file_end
{ if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
{ my $comm=<<___;
${drdecor}segment .bss
${drdecor}common ${nmdecor}OPENSSL_ia32cap_P 16
___
# comment out OPENSSL_ia32cap_P declarations
grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
push (@out,$comm)
}
push (@out,$initseg) if ($initseg);
}
sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } }
sub ::external_label
{ foreach(@_)
{ push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n"); }
}
sub ::public_label
{ push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
sub ::data_byte
{ push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); }
sub ::data_short
{ push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n"); }
sub ::data_word
{ push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); }
sub ::align
{ push(@out,"${drdecor}align\t$_[0]\n"); }
sub ::picmeup
{ my($dst,$sym)=@_;
&::lea($dst,&::DWP($sym));
}
sub ::initseg
{ my $f=$nmdecor.shift;
if ($::win32)
{ $initseg=<<___;
segment .CRT\$XCU data align=4
extern $f
dd $f
___
}
}
sub ::dataseg
{ if ($mwerks) { push(@out,".section\t.data,4\n"); }
else { push(@out,"section\t.data align=4\n"); }
}
sub ::safeseh
{ my $nm=shift;
push(@out,"%if __NASM_VERSION_ID__ >= 0x02030000\n");
push(@out,"safeseh ".&::LABEL($nm,$nmdecor.$nm)."\n");
push(@out,"%endif\n");
}
1;
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