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 ::LB
37{   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
38  $1."l";
39}
40sub ::HB
41{   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
42  $1."h";
43}
44sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num);	}
45sub ::stack_pop	{ my $num=$_[0]*4; $stack-=$num; &add("esp",$num);	}
46sub ::blindpop	{ &pop($_[0]); $stack+=4;				}
47sub ::wparam	{ &DWP($stack+4*$_[0],"esp");				}
48sub ::swtmp	{ &DWP(4*$_[0],"esp");					}
49
50sub ::bswap
51{   if ($i386)	# emulate bswap for i386
52    {	&comment("bswap @_");
53	&xchg(&HB(@_),&LB(@_));
54	&ror (@_,16);
55	&xchg(&HB(@_),&LB(@_));
56    }
57    else
58    {	&generic("bswap",@_);	}
59}
60# These are made-up opcodes introduced over the years essentially
61# by ignorance, just alias them to real ones...
62sub ::movb	{ &mov(@_);	}
63sub ::xorb	{ &xor(@_);	}
64sub ::rotl	{ &rol(@_);	}
65sub ::rotr	{ &ror(@_);	}
66sub ::exch	{ &xchg(@_);	}
67sub ::halt	{ &hlt;		}
68sub ::movz	{ &movzx(@_);	}
69sub ::pushf	{ &pushfd;	}
70sub ::popf	{ &popfd;	}
71
72# 3 argument instructions
73sub ::movq
74{ my($p1,$p2,$optimize)=@_;
75
76    if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
77    # movq between mmx registers can sink Intel CPUs
78    {	&::pshufw($p1,$p2,0xe4);		}
79    else
80    {	&::generic("movq",@_);			}
81}
82
83# SSE>2 instructions
84my %regrm = (	"eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
85		"esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7	);
86sub ::pextrd
87{ my($dst,$src,$imm)=@_;
88    if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
89    {	&::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm);	}
90    else
91    {	&::generic("pextrd",@_);		}
92}
93
94sub ::pinsrd
95{ my($dst,$src,$imm)=@_;
96    if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
97    {	&::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm);	}
98    else
99    {	&::generic("pinsrd",@_);		}
100}
101
102sub ::pshufb
103{ my($dst,$src)=@_;
104    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
105    {	&data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2);	}
106    else
107    {	&::generic("pshufb",@_);		}
108}
109
110sub ::palignr
111{ my($dst,$src,$imm)=@_;
112    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
113    {	&::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm);	}
114    else
115    {	&::generic("palignr",@_);		}
116}
117
118sub ::pclmulqdq
119{ my($dst,$src,$imm)=@_;
120    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
121    {	&::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm);	}
122    else
123    {	&::generic("pclmulqdq",@_);		}
124}
125
126sub ::rdrand
127{ my ($dst)=@_;
128    if ($dst =~ /(e[a-dsd][ixp])/)
129    {	&::data_byte(0x0f,0xc7,0xf0|$regrm{$dst});	}
130    else
131    {	&::generic("rdrand",@_);	}
132}
133
134sub rxb {
135 local *opcode=shift;
136 my ($dst,$src1,$src2,$rxb)=@_;
137
138   $rxb|=0x7<<5;
139   $rxb&=~(0x04<<5) if($dst>=8);
140   $rxb&=~(0x01<<5) if($src1>=8);
141   $rxb&=~(0x02<<5) if($src2>=8);
142   push @opcode,$rxb;
143}
144
145sub ::vprotd
146{ my $args=join(',',@_);
147    if ($args =~ /xmm([0-7]),xmm([0-7]),([x0-9a-f]+)/)
148    { my @opcode=(0x8f);
149	rxb(\@opcode,$1,$2,-1,0x08);
150	push @opcode,0x78,0xc2;
151	push @opcode,0xc0|($2&7)|(($1&7)<<3);		# ModR/M
152	my $c=$3;
153	push @opcode,$c=~/^0/?oct($c):$c;
154	&::data_byte(@opcode);
155    }
156    else
157    {	&::generic("vprotd",@_);	}
158}
159
160# label management
161$lbdecor="L";		# local label decoration, set by package
162$label="000";
163
164sub ::islabel		# see is argument is a known label
165{ my $i;
166    foreach $i (values %label) { return $i if ($i eq $_[0]); }
167  $label{$_[0]};	# can be undef
168}
169
170sub ::label		# instantiate a function-scope label
171{   if (!defined($label{$_[0]}))
172    {	$label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
173  $label{$_[0]};
174}
175
176sub ::LABEL		# instantiate a file-scope label
177{   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
178  $label{$_[0]};
179}
180
181sub ::static_label	{ &::LABEL($_[0],$lbdecor.$_[0]); }
182
183sub ::set_label_B	{ push(@out,"@_:\n"); }
184sub ::set_label
185{ my $label=&::label($_[0]);
186    &::align($_[1]) if ($_[1]>1);
187    &::set_label_B($label);
188  $label;
189}
190
191sub ::wipe_labels	# wipes function-scope labels
192{   foreach $i (keys %label)
193    {	delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/);	}
194}
195
196# subroutine management
197sub ::function_begin
198{   &function_begin_B(@_);
199    $stack=4;
200    &push("ebp");
201    &push("ebx");
202    &push("esi");
203    &push("edi");
204}
205
206sub ::function_end
207{   &pop("edi");
208    &pop("esi");
209    &pop("ebx");
210    &pop("ebp");
211    &ret();
212    &function_end_B(@_);
213    $stack=0;
214    &wipe_labels();
215}
216
217sub ::function_end_A
218{   &pop("edi");
219    &pop("esi");
220    &pop("ebx");
221    &pop("ebp");
222    &ret();
223    $stack+=16;	# readjust esp as if we didn't pop anything
224}
225
226sub ::asciz
227{ my @str=unpack("C*",shift);
228    push @str,0;
229    while ($#str>15) {
230	&data_byte(@str[0..15]);
231	foreach (0..15) { shift @str; }
232    }
233    &data_byte(@str) if (@str);
234}
235
236sub ::asm_finish
237{   &file_end();
238    print "#if defined(__i386__)\n" unless $win32;
239    print @out;
240    print "#endif\n" unless $win32;
241}
242
243sub ::asm_init
244{ my ($type,$fn,$cpu)=@_;
245
246    $filename=$fn;
247    $i386=$cpu;
248
249    $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=$android=0;
250    if    (($type eq "elf"))
251    {	$elf=1;			require "x86gas.pl";	}
252    elsif (($type eq "elf-1"))
253    {	$elf=-1;		require "x86gas.pl";	}
254    elsif (($type eq "a\.out"))
255    {	$aout=1;		require "x86gas.pl";	}
256    elsif (($type eq "coff" or $type eq "gaswin"))
257    {	$coff=1;		require "x86gas.pl";	}
258    elsif (($type eq "win32n"))
259    {	$win32=1;		require "x86nasm.pl";	}
260    elsif (($type eq "nw-nasm"))
261    {	$netware=1;		require "x86nasm.pl";	}
262    #elsif (($type eq "nw-mwasm"))
263    #{	$netware=1; $mwerks=1;	require "x86nasm.pl";	}
264    elsif (($type eq "win32"))
265    {	$win32=1;		require "x86masm.pl";	}
266    elsif (($type eq "macosx"))
267    {	$aout=1; $macosx=1;	require "x86gas.pl";	}
268    elsif (($type eq "android"))
269    {	$elf=1; $android=1;	require "x86gas.pl";	}
270    else
271    {	print STDERR <<"EOF";
272Pick one target type from
273	elf	- Linux, FreeBSD, Solaris x86, etc.
274	a.out	- DJGPP, elder OpenBSD, etc.
275	coff	- GAS/COFF such as Win32 targets
276	win32n	- Windows 95/Windows NT NASM format
277	nw-nasm - NetWare NASM format
278	macosx	- Mac OS X
279EOF
280	exit(1);
281    }
282
283    $pic=0;
284    for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
285
286    $filename =~ s/\.pl$//;
287    &file($filename);
288}
289
290sub ::hidden {}
291
2921;
293