xref: /openssl/crypto/perlasm/x86masm.pl (revision a5d9549d) 
1#! /usr/bin/env perl
2# Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the Apache License 2.0 (the "License").  You may not use
5# this file except in compliance with the License.  You can obtain a copy
6# in the file LICENSE in the source distribution or at
7# https://www.openssl.org/source/license.html
8
9
10package x86masm;
11
12*out=\@::out;
13
14$::lbdecor="\$L";	# local label decoration
15$nmdecor="_";		# external name decoration
16
17$initseg="";
18$segment="";
19
20sub ::generic
21{ my ($opcode,@arg)=@_;
22
23    # fix hexadecimal constants
24    for (@arg) { s/(?<![\w\$\.])0x([0-9a-f]+)/0$1h/oi; }
25
26    if ($opcode =~ /lea/ && @arg[1] =~ s/.*PTR\s+(\(.*\))$/OFFSET $1/)	# no []
27    {	$opcode="mov";	}
28    elsif ($opcode !~ /mov[dq]$/)
29    {	# fix xmm references
30	$arg[0] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[-1]=~/\bxmm[0-7]\b/i);
31	$arg[-1] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[0]=~/\bxmm[0-7]\b/i);
32    }
33
34    &::emit($opcode,@arg);
35  1;
36}
37#
38# opcodes not covered by ::generic above, mostly inconsistent namings...
39#
40sub ::call	{ &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
41sub ::call_ptr	{ &::emit("call",@_);	}
42sub ::jmp_ptr	{ &::emit("jmp",@_);	}
43sub ::lock	{ &::data_byte(0xf0);	}
44
45sub get_mem
46{ my($size,$addr,$reg1,$reg2,$idx)=@_;
47  my($post,$ret);
48
49    if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
50
51    $ret .= "$size PTR " if ($size ne "");
52
53    $addr =~ s/^\s+//;
54    # prepend global references with optional underscore
55    $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
56    # put address arithmetic expression in parenthesis
57    $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
58
59    if (($addr ne "") && ($addr ne 0))
60    {	if ($addr !~ /^-/)	{ $ret .= "$addr";  }
61	else			{ $post=$addr;      }
62    }
63    $ret .= "[";
64
65    if ($reg2 ne "")
66    {	$idx!=0 or $idx=1;
67	$ret .= "$reg2*$idx";
68	$ret .= "+$reg1" if ($reg1 ne "");
69    }
70    else
71    {	$ret .= "$reg1";   }
72
73    $ret .= "$post]";
74    $ret =~ s/\+\]/]/; # in case $addr was the only argument
75    $ret =~ s/\[\s*\]//;
76
77  $ret;
78}
79sub ::BP	{ &get_mem("BYTE",@_);  }
80sub ::WP	{ &get_mem("WORD",@_);	}
81sub ::DWP	{ &get_mem("DWORD",@_); }
82sub ::QWP	{ &get_mem("QWORD",@_); }
83sub ::BC	{ "@_";  }
84sub ::DWC	{ "@_"; }
85
86sub ::file
87{ my $tmp=<<___;
88IF \@Version LT 800
89ECHO MASM version 8.00 or later is strongly recommended.
90ENDIF
91.686
92.MODEL	FLAT
93OPTION	DOTNAME
94IF \@Version LT 800
95.text\$	SEGMENT PAGE 'CODE'
96ELSE
97.text\$	SEGMENT ALIGN(64) 'CODE'
98ENDIF
99___
100    push(@out,$tmp);
101    $segment = ".text\$";
102}
103
104sub ::function_begin_B
105{ my $func=shift;
106  my $global=($func !~ /^_/);
107  my $begin="${::lbdecor}_${func}_begin";
108
109    &::LABEL($func,$global?"$begin":"$nmdecor$func");
110    $func="ALIGN\t16\n".$nmdecor.$func."\tPROC";
111
112    if ($global)    { $func.=" PUBLIC\n${begin}::\n"; }
113    else	    { $func.=" PRIVATE\n";            }
114    push(@out,$func);
115    $::stack=4;
116}
117sub ::function_end_B
118{ my $func=shift;
119
120    push(@out,"$nmdecor$func ENDP\n");
121    $::stack=0;
122    &::wipe_labels();
123}
124
125sub ::file_end
126{ my $xmmheader=<<___;
127.686
128.XMM
129IF \@Version LT 800
130XMMWORD STRUCT 16
131DQ	2 dup (?)
132XMMWORD	ENDS
133ENDIF
134___
135    if (grep {/\b[x]?mm[0-7]\b/i} @out) {
136	grep {s/\.[3-7]86/$xmmheader/} @out;
137    }
138
139    push(@out,"$segment	ENDS\n");
140
141    if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
142    {	my $comm=<<___;
143.bss	SEGMENT 'BSS'
144COMM	${nmdecor}OPENSSL_ia32cap_P:DWORD:4
145.bss	ENDS
146___
147	# comment out OPENSSL_ia32cap_P declarations
148	grep {s/(^EXTERN\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
149	push (@out,$comm);
150    }
151    push (@out,$initseg) if ($initseg);
152    push (@out,"END\n");
153}
154
155sub ::comment {   foreach (@_) { push(@out,"\t; $_\n"); }   }
156
157*::set_label_B = sub
158{ my $l=shift; push(@out,$l.($l=~/^\Q${::lbdecor}\E[0-9]{3}/?":\n":"::\n")); };
159
160sub ::external_label
161{   foreach(@_)
162    {	push(@out, "EXTERN\t".&::LABEL($_,$nmdecor.$_).":NEAR\n");   }
163}
164
165sub ::public_label
166{   push(@out,"PUBLIC\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
167
168sub ::data_byte
169{   push(@out,("DB\t").join(',',splice(@_,0,16))."\n") while(@_);	}
170
171sub ::data_short
172{   push(@out,("DW\t").join(',',splice(@_,0,8))."\n") while(@_);	}
173
174sub ::data_word
175{   push(@out,("DD\t").join(',',splice(@_,0,4))."\n") while(@_);	}
176
177sub ::align
178{   push(@out,"ALIGN\t$_[0]\n");	}
179
180sub ::picmeup
181{ my($dst,$sym)=@_;
182    &::lea($dst,&::DWP($sym));
183}
184
185sub ::initseg
186{ my $f=$nmdecor.shift;
187
188    $initseg.=<<___;
189.CRT\$XCU	SEGMENT DWORD PUBLIC 'DATA'
190EXTERN	$f:NEAR
191DD	$f
192.CRT\$XCU	ENDS
193___
194}
195
196sub ::dataseg
197{   push(@out,"$segment\tENDS\n_DATA\tSEGMENT\n"); $segment="_DATA";   }
198
199sub ::safeseh
200{ my $nm=shift;
201    push(@out,"IF \@Version GE 710\n");
202    push(@out,".SAFESEH	".&::LABEL($nm,$nmdecor.$nm)."\n");
203    push(@out,"ENDIF\n");
204}
205
2061;
207