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# AESNI extenstion
84sub ::aeskeygenassist
85{ my($dst,$src,$imm)=@_;
86    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
87    {	&data_byte(0x66,0x0f,0x3a,0xdf,0xc0|($1<<3)|$2,$imm);	}
88}
89sub ::aescommon
90{ my($opcodelet,$dst,$src)=@_;
91    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
92    {	&data_byte(0x66,0x0f,0x38,$opcodelet,0xc0|($1<<3)|$2);	}
93}
94sub ::aesimc		{ ::aescommon(0xdb,@_); }
95sub ::aesenc		{ ::aescommon(0xdc,@_); }
96sub ::aesenclast	{ ::aescommon(0xdd,@_); }
97sub ::aesdec		{ ::aescommon(0xde,@_); }
98sub ::aesdeclast	{ ::aescommon(0xdf,@_); }
99
100# label management
101$lbdecor="L";		# local label decoration, set by package
102$label="000";
103
104sub ::islabel		# see is argument is a known label
105{ my $i;
106    foreach $i (values %label) { return $i if ($i eq $_[0]); }
107  $label{$_[0]};	# can be undef
108}
109
110sub ::label		# instantiate a function-scope label
111{   if (!defined($label{$_[0]}))
112    {	$label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
113  $label{$_[0]};
114}
115
116sub ::LABEL		# instantiate a file-scope label
117{   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
118  $label{$_[0]};
119}
120
121sub ::static_label	{ &::LABEL($_[0],$lbdecor.$_[0]); }
122
123sub ::set_label_B	{ push(@out,"@_:\n"); }
124sub ::set_label
125{ my $label=&::label($_[0]);
126    &::align($_[1]) if ($_[1]>1);
127    &::set_label_B($label);
128  $label;
129}
130
131sub ::wipe_labels	# wipes function-scope labels
132{   foreach $i (keys %label)
133    {	delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/);	}
134}
135
136# subroutine management
137sub ::function_begin
138{   &function_begin_B(@_);
139    $stack=4;
140    &push("ebp");
141    &push("ebx");
142    &push("esi");
143    &push("edi");
144}
145
146sub ::function_end
147{   &pop("edi");
148    &pop("esi");
149    &pop("ebx");
150    &pop("ebp");
151    &ret();
152    &function_end_B(@_);
153    $stack=0;
154    &wipe_labels();
155}
156
157sub ::function_end_A
158{   &pop("edi");
159    &pop("esi");
160    &pop("ebx");
161    &pop("ebp");
162    &ret();
163    $stack+=16;	# readjust esp as if we didn't pop anything
164}
165
166sub ::asciz
167{ my @str=unpack("C*",shift);
168    push @str,0;
169    while ($#str>15) {
170	&data_byte(@str[0..15]);
171	foreach (0..15) { shift @str; }
172    }
173    &data_byte(@str) if (@str);
174}
175
176sub ::asm_finish
177{   &file_end();
178    print @out;
179}
180
181sub ::asm_init
182{ my ($type,$fn,$cpu)=@_;
183
184    $filename=$fn;
185    $i386=$cpu;
186
187    $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=0;
188    if    (($type eq "elf"))
189    {	$elf=1;			require "x86gas.pl";	}
190    elsif (($type eq "a\.out"))
191    {	$aout=1;		require "x86gas.pl";	}
192    elsif (($type eq "coff" or $type eq "gaswin"))
193    {	$coff=1;		require "x86gas.pl";	}
194    elsif (($type eq "win32n"))
195    {	$win32=1;		require "x86nasm.pl";	}
196    elsif (($type eq "nw-nasm"))
197    {	$netware=1;		require "x86nasm.pl";	}
198    #elsif (($type eq "nw-mwasm"))
199    #{	$netware=1; $mwerks=1;	require "x86nasm.pl";	}
200    elsif (($type eq "win32"))
201    {	$win32=1;		require "x86masm.pl";	}
202    elsif (($type eq "macosx"))
203    {	$aout=1; $macosx=1;	require "x86gas.pl";	}
204    else
205    {	print STDERR <<"EOF";
206Pick one target type from
207	elf	- Linux, FreeBSD, Solaris x86, etc.
208	a.out	- DJGPP, elder OpenBSD, etc.
209	coff	- GAS/COFF such as Win32 targets
210	win32n	- Windows 95/Windows NT NASM format
211	nw-nasm - NetWare NASM format
212	macosx	- Mac OS X
213EOF
214	exit(1);
215    }
216
217    $pic=0;
218    for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
219
220    $filename =~ s/\.pl$//;
221    &file($filename);
222}
223
2241;
225