xref: /openssl/crypto/perlasm/x86gas.pl (revision 33388b44) 
1#! /usr/bin/env perl
2# Copyright 2007-2020 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 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    &::endbranch();
128    $::stack=4;
129}
130
131sub ::function_end_B
132{ my $func=shift;
133    push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
134    $::stack=0;
135    &::wipe_labels();
136}
137
138sub ::comment
139	{
140	if (!defined($com_start) or $::elf)
141		{	# Regarding $::elf above...
142			# GNU and SVR4 as'es use different comment delimiters,
143		push(@out,"\n");	# so we just skip ELF comments...
144		return;
145		}
146	foreach (@_)
147		{
148		if (/^\s*$/)
149			{ push(@out,"\n"); }
150		else
151			{ push(@out,"\t$com_start $_ $com_end\n"); }
152		}
153	}
154
155sub ::external_label
156{   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }
157
158sub ::public_label
159{   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
160
161sub ::file_end
162{   if ($::macosx)
163    {	if (%non_lazy_ptr)
164    	{   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
165	    foreach $i (keys %non_lazy_ptr)
166	    {	push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
167	}
168    }
169    if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
170	my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
171	if ($::macosx)	{ push (@out,"$tmp,2\n"); }
172	elsif ($::elf)	{ push (@out,"$tmp,4\n"); }
173	else		{ push (@out,"$tmp\n"); }
174    }
175    push(@out,$initseg) if ($initseg);
176    if ($::elf) {
177	push(@out,"
178	.section \".note.gnu.property\", \"a\"
179	.p2align 2
180	.long 1f - 0f
181	.long 4f - 1f
182	.long 5
1830:
184	.asciz \"GNU\"
1851:
186	.p2align 2
187	.long 0xc0000002
188	.long 3f - 2f
1892:
190	.long 3
1913:
192	.p2align 2
1934:
194");
195    }
196}
197
198sub ::data_byte	{   push(@out,".byte\t".join(',',@_)."\n");   }
199sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
200sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
201
202sub ::align
203{ my $val=$_[0];
204    if ($::aout)
205    {	$val=int(log($val)/log(2));
206	$val.=",0x90";
207    }
208    push(@out,".align\t$val\n");
209}
210
211sub ::picmeup
212{ my($dst,$sym,$base,$reflabel)=@_;
213
214    if (($::pic && ($::elf || $::aout)) || $::macosx)
215    {	if (!defined($base))
216	{   &::call(&::label("PIC_me_up"));
217	    &::set_label("PIC_me_up");
218	    &::blindpop($dst);
219	    $base=$dst;
220	    $reflabel=&::label("PIC_me_up");
221	}
222	if ($::macosx)
223	{   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
224	    &::mov($dst,&::DWP("$indirect-$reflabel",$base));
225	    $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
226	}
227	elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
228	{   &::lea($dst,&::DWP("$sym-$reflabel",$base));   }
229	else
230	{   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
231			    $base));
232	    &::mov($dst,&::DWP("$sym\@GOT",$dst));
233	}
234    }
235    else
236    {	&::lea($dst,&::DWP($sym));	}
237}
238
239sub ::initseg
240{ my $f=$nmdecor.shift;
241
242    if ($::android)
243    {	$initseg.=<<___;
244.section	.init_array
245.align	4
246.long	$f
247___
248    }
249    elsif ($::elf)
250    {	$initseg.=<<___;
251.section	.init
252	call	$f
253___
254    }
255    elsif ($::coff)
256    {   $initseg.=<<___;	# applies to both Cygwin and Mingw
257.section	.ctors
258.long	$f
259___
260    }
261    elsif ($::macosx)
262    {	$initseg.=<<___;
263.mod_init_func
264.align 2
265.long   $f
266___
267    }
268    elsif ($::aout)
269    {	my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
270	$initseg.=".text\n";
271	$initseg.=".type	$ctor,\@function\n" if ($::pic);
272	$initseg.=<<___;	# OpenBSD way...
273.globl	$ctor
274.align	2
275$ctor:
276	jmp	$f
277___
278    }
279}
280
281sub ::dataseg
282{   push(@out,".data\n");   }
283
284*::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);
285
2861;
287