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#! /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 x86masm;
*out=\@::out;
$::lbdecor="\$L"; # local label decoration
$nmdecor="_"; # external name decoration
$initseg="";
$segment="";
sub ::generic
{ my ($opcode,@arg)=@_;
# fix hexadecimal constants
for (@arg) { s/(?<![\w\$\.])0x([0-9a-f]+)/0$1h/oi; }
if ($opcode =~ /lea/ && @arg[1] =~ s/.*PTR\s+(\(.*\))$/OFFSET $1/) # no []
{ $opcode="mov"; }
elsif ($opcode !~ /mov[dq]$/)
{ # fix xmm references
$arg[0] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[-1]=~/\bxmm[0-7]\b/i);
$arg[-1] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[0]=~/\bxmm[0-7]\b/i);
}
&::emit($opcode,@arg);
1;
}
#
# opcodes not covered by ::generic above, mostly inconsistent namings...
#
sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
sub ::call_ptr { &::emit("call",@_); }
sub ::jmp_ptr { &::emit("jmp",@_); }
sub ::lock { &::data_byte(0xf0); }
sub get_mem
{ my($size,$addr,$reg1,$reg2,$idx)=@_;
my($post,$ret);
if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
$ret .= "$size PTR " if ($size ne "");
$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; }
}
$ret .= "[";
if ($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 =~ s/\[\s*\]//;
$ret;
}
sub ::BP { &get_mem("BYTE",@_); }
sub ::WP { &get_mem("WORD",@_); }
sub ::DWP { &get_mem("DWORD",@_); }
sub ::QWP { &get_mem("QWORD",@_); }
sub ::BC { "@_"; }
sub ::DWC { "@_"; }
sub ::file
{ my $tmp=<<___;
IF \@Version LT 800
ECHO MASM version 8.00 or later is strongly recommended.
ENDIF
.686
.MODEL FLAT
OPTION DOTNAME
IF \@Version LT 800
.text\$ SEGMENT PAGE 'CODE'
ELSE
.text\$ SEGMENT ALIGN(64) 'CODE'
ENDIF
___
push(@out,$tmp);
$segment = ".text\$";
}
sub ::function_begin_B
{ my $func=shift;
my $global=($func !~ /^_/);
my $begin="${::lbdecor}_${func}_begin";
&::LABEL($func,$global?"$begin":"$nmdecor$func");
$func="ALIGN\t16\n".$nmdecor.$func."\tPROC";
if ($global) { $func.=" PUBLIC\n${begin}::\n"; }
else { $func.=" PRIVATE\n"; }
push(@out,$func);
$::stack=4;
}
sub ::function_end_B
{ my $func=shift;
push(@out,"$nmdecor$func ENDP\n");
$::stack=0;
&::wipe_labels();
}
sub ::file_end
{ my $xmmheader=<<___;
.686
.XMM
IF \@Version LT 800
XMMWORD STRUCT 16
DQ 2 dup (?)
XMMWORD ENDS
ENDIF
___
if (grep {/\b[x]?mm[0-7]\b/i} @out) {
grep {s/\.[3-7]86/$xmmheader/} @out;
}
push(@out,"$segment ENDS\n");
if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
{ my $comm=<<___;
.bss SEGMENT 'BSS'
COMM ${nmdecor}OPENSSL_ia32cap_P:DWORD:4
.bss ENDS
___
# comment out OPENSSL_ia32cap_P declarations
grep {s/(^EXTERN\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
push (@out,$comm);
}
push (@out,$initseg) if ($initseg);
push (@out,"END\n");
}
sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } }
*::set_label_B = sub
{ my $l=shift; push(@out,$l.($l=~/^\Q${::lbdecor}\E[0-9]{3}/?":\n":"::\n")); };
sub ::external_label
{ foreach(@_)
{ push(@out, "EXTERN\t".&::LABEL($_,$nmdecor.$_).":NEAR\n"); }
}
sub ::public_label
{ push(@out,"PUBLIC\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
sub ::data_byte
{ push(@out,("DB\t").join(',',splice(@_,0,16))."\n") while(@_); }
sub ::data_short
{ push(@out,("DW\t").join(',',splice(@_,0,8))."\n") while(@_); }
sub ::data_word
{ push(@out,("DD\t").join(',',splice(@_,0,4))."\n") while(@_); }
sub ::align
{ push(@out,"ALIGN\t$_[0]\n"); }
sub ::picmeup
{ my($dst,$sym)=@_;
&::lea($dst,&::DWP($sym));
}
sub ::initseg
{ my $f=$nmdecor.shift;
$initseg.=<<___;
.CRT\$XCU SEGMENT DWORD PUBLIC 'DATA'
EXTERN $f:NEAR
DD $f
.CRT\$XCU ENDS
___
}
sub ::dataseg
{ push(@out,"$segment\tENDS\n_DATA\tSEGMENT\n"); $segment="_DATA"; }
sub ::safeseh
{ my $nm=shift;
push(@out,"IF \@Version GE 710\n");
push(@out,".SAFESEH ".&::LABEL($nm,$nmdecor.$nm)."\n");
push(@out,"ENDIF\n");
}
1;
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