xref: /openbsd/lib/libcrypto/perlasm/x86asm.pl (revision e60c46c4) 
1#!/usr/bin/env perl
2
3# require 'x86asm.pl';
4# &asm_init(<flavor>,"des-586.pl"[,$i386only]);
5# &function_begin("foo");
6# ...
7# &function_end("foo");
8# &asm_finish
9
10$out=();
11$i386=0;
12
13# AUTOLOAD is this context has quite unpleasant side effect, namely
14# that typos in function calls effectively go to assembler output,
15# but on the pros side we don't have to implement one subroutine per
16# each opcode...
17sub ::AUTOLOAD
18{ my $opcode = $AUTOLOAD;
19
20    die "more than 4 arguments passed to $opcode" if ($#_>3);
21
22    $opcode =~ s/.*:://;
23    if    ($opcode =~ /^push/) { $stack+=4; }
24    elsif ($opcode =~ /^pop/)  { $stack-=4; }
25
26    &generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
27}
28
29sub ::emit
30{ my $opcode=shift;
31
32    if ($#_==-1)    { push(@out,"\t$opcode\n");				}
33    else            { push(@out,"\t$opcode\t".join(',',@_)."\n");	}
34}
35
36sub ::emitraw
37{ my $opcode=shift;
38
39    if ($#_==-1)    { push(@out,"$opcode\n");				}
40    else            { push(@out,"$opcode\t".join(',',@_)."\n");	}
41}
42
43sub ::LB
44{   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
45  $1."l";
46}
47sub ::HB
48{   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
49  $1."h";
50}
51sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num);	}
52sub ::stack_pop	{ my $num=$_[0]*4; $stack-=$num; &add("esp",$num);	}
53sub ::blindpop	{ &pop($_[0]); $stack+=4;				}
54sub ::wparam	{ &DWP($stack+4*$_[0],"esp");				}
55sub ::swtmp	{ &DWP(4*$_[0],"esp");					}
56
57sub ::bswap
58{   if ($i386)	# emulate bswap for i386
59    {	&comment("bswap @_");
60	&xchg(&HB(@_),&LB(@_));
61	&ror (@_,16);
62	&xchg(&HB(@_),&LB(@_));
63    }
64    else
65    {	&generic("bswap",@_);	}
66}
67# These are made-up opcodes introduced over the years essentially
68# by ignorance, just alias them to real ones...
69sub ::movb	{ &mov(@_);	}
70sub ::xorb	{ &xor(@_);	}
71sub ::rotl	{ &rol(@_);	}
72sub ::rotr	{ &ror(@_);	}
73sub ::exch	{ &xchg(@_);	}
74sub ::halt	{ &hlt;		}
75sub ::movz	{ &movzx(@_);	}
76sub ::pushf	{ &pushfd;	}
77sub ::popf	{ &popfd;	}
78
79# 3 argument instructions
80sub ::movq
81{ my($p1,$p2,$optimize)=@_;
82
83    if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
84    # movq between mmx registers can sink Intel CPUs
85    {	&::pshufw($p1,$p2,0xe4);		}
86    else
87    {	&::generic("movq",@_);			}
88}
89
90# SSE>2 instructions
91my %regrm = (	"eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
92		"esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7	);
93sub ::pextrd
94{ my($dst,$src,$imm)=@_;
95    if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
96    {	&::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm);	}
97    else
98    {	&::generic("pextrd",@_);		}
99}
100
101sub ::pinsrd
102{ my($dst,$src,$imm)=@_;
103    if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
104    {	&::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm);	}
105    else
106    {	&::generic("pinsrd",@_);		}
107}
108
109sub ::pshufb
110{ my($dst,$src)=@_;
111    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
112    {	&data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2);	}
113    else
114    {	&::generic("pshufb",@_);		}
115}
116
117sub ::palignr
118{ my($dst,$src,$imm)=@_;
119    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
120    {	&::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm);	}
121    else
122    {	&::generic("palignr",@_);		}
123}
124
125sub ::pclmulqdq
126{ my($dst,$src,$imm)=@_;
127    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
128    {	&::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm);	}
129    else
130    {	&::generic("pclmulqdq",@_);		}
131}
132
133# label management
134$lbdecor="L";		# local label decoration, set by package
135$label="000";
136
137sub ::islabel		# see is argument is a known label
138{ my $i;
139    foreach $i (values %label) { return $i if ($i eq $_[0]); }
140  $label{$_[0]};	# can be undef
141}
142
143sub ::label		# instantiate a function-scope label
144{   if (!defined($label{$_[0]}))
145    {	$label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
146  $label{$_[0]};
147}
148
149sub ::LABEL		# instantiate a file-scope label
150{   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
151  $label{$_[0]};
152}
153
154sub ::static_label	{ &::LABEL($_[0],$lbdecor.$_[0]); }
155
156sub ::set_label_B	{ push(@out,"@_:\n"); }
157sub ::set_label
158{ my $label=&::label($_[0]);
159    &::align($_[1]) if ($_[1]>1);
160    &::set_label_B($label);
161  $label;
162}
163
164sub ::wipe_labels	# wipes function-scope labels
165{   foreach $i (keys %label)
166    {	delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/);	}
167}
168
169# subroutine management
170sub ::function_begin
171{   &function_begin_B(@_);
172    $stack=4;
173    &push("ebp");
174    &push("ebx");
175    &push("esi");
176    &push("edi");
177}
178
179sub ::function_end
180{   &pop("edi");
181    &pop("esi");
182    &pop("ebx");
183    &pop("ebp");
184    &ret();
185    &function_end_B(@_);
186    $stack=0;
187    &wipe_labels();
188}
189
190sub ::function_end_A
191{   &pop("edi");
192    &pop("esi");
193    &pop("ebx");
194    &pop("ebp");
195    &ret();
196    $stack+=16;	# readjust esp as if we didn't pop anything
197}
198
199sub ::asciz
200{ my @str=unpack("C*",shift);
201    push @str,0;
202    while ($#str>15) {
203	&data_byte(@str[0..15]);
204	foreach (0..15) { shift @str; }
205    }
206    &data_byte(@str) if (@str);
207}
208
209sub ::asm_finish
210{   &file_end();
211    print @out;
212}
213
214sub ::asm_init
215{ my ($type,$fn,$cpu)=@_;
216
217    $filename=$fn;
218    $i386=$cpu;
219
220    $elf=$cpp=$coff=$aout=$macosx=$win32=$openbsd=$android=0;
221    if    (($type eq "elf"))
222    {	$elf=1;			require "x86gas.pl";	}
223    elsif (($type eq "a\.out"))
224    {	$aout=1;		require "x86gas.pl";	}
225    elsif (($type eq "coff" or $type eq "gaswin"))
226    {	$coff=1;		require "x86gas.pl";	}
227    elsif (($type eq "macosx"))
228    {	$aout=1; $macosx=1;	require "x86gas.pl";	}
229    elsif (($type eq "openbsd-elf"))
230    {	$openbsd=$elf=1;	require "x86gas.pl";	}
231    elsif (($type eq "openbsd-a.out"))
232    {	$openbsd=1;		require "x86gas.pl";	}
233    elsif (($type eq "android"))
234    {	$elf=1; $android=1;	require "x86gas.pl";	}
235    else
236    {	print STDERR <<"EOF";
237Pick one target type from
238	elf	- Linux, FreeBSD, Solaris x86, etc.
239	a.out	- DJGPP, elder OpenBSD, etc.
240	coff	- GAS/COFF such as Win32 targets
241	openbsd-elf	- OpenBSD elf
242	openbsd-a.out	- OpenBSD a.out
243	macosx	- Mac OS X
244EOF
245	exit(1);
246    }
247
248    $pic=0;
249    for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
250
251    ::emitraw("#include \"x86_arch.h\"\n");
252    ::emitraw("#include <machine/asm.h>\n") if $openbsd;
253    $filename =~ s/\.pl$//;
254    &file($filename);
255}
256
2571;
258