xref: /openssl/crypto/perlasm/x86gas.pl (revision acc26552) 
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    # OPENSSL_ia32cap_P size should match with internal/cryptlib.h OPENSSL_IA32CAP_P_MAX_INDEXES
171	my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,40";
172	if ($::macosx)	{ push (@out,"$tmp,2\n"); }
173	elsif ($::elf)	{ push (@out,"$tmp,4\n"); }
174	else		{ push (@out,"$tmp\n"); }
175    }
176    push(@out,$initseg) if ($initseg);
177    if ($::elf) {
178	push(@out,"
179	.section \".note.gnu.property\", \"a\"
180	.p2align 2
181	.long 1f - 0f
182	.long 4f - 1f
183	.long 5
1840:
185	.asciz \"GNU\"
1861:
187	.p2align 2
188	.long 0xc0000002
189	.long 3f - 2f
1902:
191	.long 3
1923:
193	.p2align 2
1944:
195");
196    }
197}
198
199sub ::data_byte	{   push(@out,".byte\t".join(',',@_)."\n");   }
200sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
201sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
202
203sub ::align
204{ my $val=$_[0];
205    if ($::aout)
206    {	$val=int(log($val)/log(2));
207	$val.=",0x90";
208    }
209    push(@out,".align\t$val\n");
210}
211
212sub ::picmeup
213{ my($dst,$sym,$base,$reflabel)=@_;
214
215    if (($::pic && ($::elf || $::aout)) || $::macosx)
216    {	if (!defined($base))
217	{   &::call(&::label("PIC_me_up"));
218	    &::set_label("PIC_me_up");
219	    &::blindpop($dst);
220	    $base=$dst;
221	    $reflabel=&::label("PIC_me_up");
222	}
223	if ($::macosx)
224	{   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
225	    &::mov($dst,&::DWP("$indirect-$reflabel",$base));
226	    $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
227	}
228	elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
229	{   &::lea($dst,&::DWP("$sym-$reflabel",$base));   }
230	else
231	{   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
232			    $base));
233	    &::mov($dst,&::DWP("$sym\@GOT",$dst));
234	}
235    }
236    else
237    {	&::lea($dst,&::DWP($sym));	}
238}
239
240sub ::initseg
241{ my $f=$nmdecor.shift;
242
243    if ($::android)
244    {	$initseg.=<<___;
245.section	.init_array
246.align	4
247.long	$f
248___
249    }
250    elsif ($::elf)
251    {	$initseg.=<<___;
252.section	.init
253	call	$f
254___
255    }
256    elsif ($::coff)
257    {   $initseg.=<<___;	# applies to both Cygwin and Mingw
258.section	.ctors
259.long	$f
260___
261    }
262    elsif ($::macosx)
263    {	$initseg.=<<___;
264.mod_init_func
265.align 2
266.long   $f
267___
268    }
269    elsif ($::aout)
270    {	my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
271	$initseg.=".text\n";
272	$initseg.=".type	$ctor,\@function\n" if ($::pic);
273	$initseg.=<<___;	# OpenBSD way...
274.globl	$ctor
275.align	2
276$ctor:
277	jmp	$f
278___
279    }
280}
281
282sub ::dataseg
283{   push(@out,".data\n");   }
284
285*::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);
286
2871;
288