1#! /usr/bin/env perl
2# Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the OpenSSL license (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 x86gas;
11
12*out=\@::out;
13
14$::lbdecor=$::aout?"L":".L";		# local label decoration
15$nmdecor=($::aout or $::coff)?"_":"";	# external name decoration
16
17$initseg="";
18
19$align=16;
20$align=log($align)/log(2) if ($::aout);
21$com_start="#" if ($::aout or $::coff);
22
23sub opsize()
24{ my $reg=shift;
25    if    ($reg =~ m/^%e/o)		{ "l"; }
26    elsif ($reg =~ m/^%[a-d][hl]$/o)	{ "b"; }
27    elsif ($reg =~ m/^%[yxm]/o)		{ undef; }
28    else				{ "w"; }
29}
30
31# swap arguments;
32# expand opcode with size suffix;
33# prefix numeric constants with $;
34sub ::generic
35{ my($opcode,@arg)=@_;
36  my($suffix,$dst,$src);
37
38    @arg=reverse(@arg);
39
40    for (@arg)
41    {	s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;	# gp registers
42	s/^([xy]?mm[0-7])$/%$1/o;		# xmm/mmx registers
43	s/^(\-?[0-9]+)$/\$$1/o;			# constants
44	s/^(\-?0x[0-9a-f]+)$/\$$1/o;		# constants
45    }
46
47    $dst = $arg[$#arg]		if ($#arg>=0);
48    $src = $arg[$#arg-1]	if ($#arg>=1);
49    if    ($dst =~ m/^%/o)	{ $suffix=&opsize($dst); }
50    elsif ($src =~ m/^%/o)	{ $suffix=&opsize($src); }
51    else			{ $suffix="l";           }
52    undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
53
54    if ($#_==0)				{ &::emit($opcode);		}
55    elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
56					{ &::emit($opcode,@arg);	}
57    else				{ &::emit($opcode.$suffix,@arg);}
58
59  1;
60}
61#
62# opcodes not covered by ::generic above, mostly inconsistent namings...
63#
64sub ::movzx	{ &::movzb(@_);			}
65sub ::pushfd	{ &::pushfl;			}
66sub ::popfd	{ &::popfl;			}
67sub ::cpuid	{ &::emit(".byte\t0x0f,0xa2");	}
68sub ::rdtsc	{ &::emit(".byte\t0x0f,0x31");	}
69
70sub ::call	{ &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
71sub ::call_ptr	{ &::generic("call","*$_[0]");	}
72sub ::jmp_ptr	{ &::generic("jmp","*$_[0]");	}
73
74*::bswap = sub	{ &::emit("bswap","%$_[0]");	} if (!$::i386);
75
76sub ::DWP
77{ my($addr,$reg1,$reg2,$idx)=@_;
78  my $ret="";
79
80    if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
81
82    $addr =~ s/^\s+//;
83    # prepend global references with optional underscore
84    $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
85
86    $reg1 = "%$reg1" if ($reg1);
87    $reg2 = "%$reg2" if ($reg2);
88
89    $ret .= $addr if (($addr ne "") && ($addr ne 0));
90
91    if ($reg2)
92    {	$idx!= 0 or $idx=1;
93	$ret .= "($reg1,$reg2,$idx)";
94    }
95    elsif ($reg1)
96    {	$ret .= "($reg1)";	}
97
98  $ret;
99}
100sub ::QWP	{ &::DWP(@_);	}
101sub ::BP	{ &::DWP(@_);	}
102sub ::WP	{ &::DWP(@_);	}
103sub ::BC	{ @_;		}
104sub ::DWC	{ @_;		}
105
106sub ::file
107{   push(@out,".text\n");	}
108
109sub ::function_begin_B
110{ my $func=shift;
111  my $global=($func !~ /^_/);
112  my $begin="${::lbdecor}_${func}_begin";
113
114    &::LABEL($func,$global?"$begin":"$nmdecor$func");
115    $func=$nmdecor.$func;
116
117    push(@out,".globl\t$func\n")	if ($global);
118    if ($::coff)
119    {	push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
120    elsif (($::aout and !$::pic) or $::macosx)
121    { }
122    else
123    {	push(@out,".type	$func,\@function\n"); }
124    push(@out,".align\t$align\n");
125    push(@out,"$func:\n");
126    push(@out,"$begin:\n")		if ($global);
127    $::stack=4;
128}
129
130sub ::function_end_B
131{ my $func=shift;
132    push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
133    $::stack=0;
134    &::wipe_labels();
135}
136
137sub ::comment
138	{
139	if (!defined($com_start) or $::elf)
140		{	# Regarding $::elf above...
141			# GNU and SVR4 as'es use different comment delimiters,
142		push(@out,"\n");	# so we just skip ELF comments...
143		return;
144		}
145	foreach (@_)
146		{
147		if (/^\s*$/)
148			{ push(@out,"\n"); }
149		else
150			{ push(@out,"\t$com_start $_ $com_end\n"); }
151		}
152	}
153
154sub ::external_label
155{   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }
156
157sub ::public_label
158{   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
159
160sub ::file_end
161{   if ($::macosx)
162    {	if (%non_lazy_ptr)
163    	{   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
164	    foreach $i (keys %non_lazy_ptr)
165	    {	push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
166	}
167    }
168    if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
169	my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
170	if ($::macosx)	{ push (@out,"$tmp,2\n"); }
171	elsif ($::elf)	{ push (@out,"$tmp,4\n"); }
172	else		{ push (@out,"$tmp\n"); }
173    }
174    push(@out,$initseg) if ($initseg);
175}
176
177sub ::data_byte	{   push(@out,".byte\t".join(',',@_)."\n");   }
178sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
179sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
180
181sub ::align
182{ my $val=$_[0];
183    if ($::aout)
184    {	$val=int(log($val)/log(2));
185	$val.=",0x90";
186    }
187    push(@out,".align\t$val\n");
188}
189
190sub ::picmeup
191{ my($dst,$sym,$base,$reflabel)=@_;
192
193    if (($::pic && ($::elf || $::aout)) || $::macosx)
194    {	if (!defined($base))
195	{   &::call(&::label("PIC_me_up"));
196	    &::set_label("PIC_me_up");
197	    &::blindpop($dst);
198	    $base=$dst;
199	    $reflabel=&::label("PIC_me_up");
200	}
201	if ($::macosx)
202	{   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
203	    &::mov($dst,&::DWP("$indirect-$reflabel",$base));
204	    $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
205	}
206	elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
207	{   &::lea($dst,&::DWP("$sym-$reflabel",$base));   }
208	else
209	{   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
210			    $base));
211	    &::mov($dst,&::DWP("$sym\@GOT",$dst));
212	}
213    }
214    else
215    {	&::lea($dst,&::DWP($sym));	}
216}
217
218sub ::initseg
219{ my $f=$nmdecor.shift;
220
221    if ($::android)
222    {	$initseg.=<<___;
223.section	.init_array
224.align	4
225.long	$f
226___
227    }
228    elsif ($::elf)
229    {	$initseg.=<<___;
230.section	.init
231	call	$f
232___
233    }
234    elsif ($::coff)
235    {   $initseg.=<<___;	# applies to both Cygwin and Mingw
236.section	.ctors
237.long	$f
238___
239    }
240    elsif ($::macosx)
241    {	$initseg.=<<___;
242.mod_init_func
243.align 2
244.long   $f
245___
246    }
247    elsif ($::aout)
248    {	my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
249	$initseg.=".text\n";
250	$initseg.=".type	$ctor,\@function\n" if ($::pic);
251	$initseg.=<<___;	# OpenBSD way...
252.globl	$ctor
253.align	2
254$ctor:
255	jmp	$f
256___
257    }
258}
259
260sub ::dataseg
261{   push(@out,".data\n");   }
262
263*::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);
264
2651;
266