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# label management
84$lbdecor="L";		# local label decoration, set by package
85$label="000";
86
87sub ::islabel		# see is argument is a known label
88{ my $i;
89    foreach $i (values %label) { return $i if ($i eq $_[0]); }
90  $label{$_[0]};	# can be undef
91}
92
93sub ::label		# instantiate a function-scope label
94{   if (!defined($label{$_[0]}))
95    {	$label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
96  $label{$_[0]};
97}
98
99sub ::LABEL		# instantiate a file-scope label
100{   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
101  $label{$_[0]};
102}
103
104sub ::static_label	{ &::LABEL($_[0],$lbdecor.$_[0]); }
105
106sub ::set_label_B	{ push(@out,"@_:\n"); }
107sub ::set_label
108{ my $label=&::label($_[0]);
109    &::align($_[1]) if ($_[1]>1);
110    &::set_label_B($label);
111  $label;
112}
113
114sub ::wipe_labels	# wipes function-scope labels
115{   foreach $i (keys %label)
116    {	delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/);	}
117}
118
119# subroutine management
120sub ::function_begin
121{   &function_begin_B(@_);
122    $stack=4;
123    &push("ebp");
124    &push("ebx");
125    &push("esi");
126    &push("edi");
127}
128
129sub ::function_end
130{   &pop("edi");
131    &pop("esi");
132    &pop("ebx");
133    &pop("ebp");
134    &ret();
135    &function_end_B(@_);
136    $stack=0;
137    &wipe_labels();
138}
139
140sub ::function_end_A
141{   &pop("edi");
142    &pop("esi");
143    &pop("ebx");
144    &pop("ebp");
145    &ret();
146    $stack+=16;	# readjust esp as if we didn't pop anything
147}
148
149sub ::asciz
150{ my @str=unpack("C*",shift);
151    push @str,0;
152    while ($#str>15) {
153	&data_byte(@str[0..15]);
154	foreach (0..15) { shift @str; }
155    }
156    &data_byte(@str) if (@str);
157}
158
159sub ::asm_finish
160{   &file_end();
161    print @out;
162}
163
164sub ::asm_init
165{ my ($type,$fn,$cpu)=@_;
166
167    $filename=$fn;
168    $i386=$cpu;
169
170    $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=0;
171    if    (($type eq "elf"))
172    {	$elf=1;			require "x86gas.pl";	}
173    elsif (($type eq "a\.out"))
174    {	$aout=1;		require "x86gas.pl";	}
175    elsif (($type eq "coff" or $type eq "gaswin"))
176    {	$coff=1;		require "x86gas.pl";	}
177    elsif (($type eq "win32n"))
178    {	$win32=1;		require "x86nasm.pl";	}
179    elsif (($type eq "nw-nasm"))
180    {	$netware=1;		require "x86nasm.pl";	}
181    #elsif (($type eq "nw-mwasm"))
182    #{	$netware=1; $mwerks=1;	require "x86nasm.pl";	}
183    elsif (($type eq "win32"))
184    {	$win32=1;		require "x86masm.pl";	}
185    elsif (($type eq "macosx"))
186    {	$aout=1; $macosx=1;	require "x86gas.pl";	}
187    else
188    {	print STDERR <<"EOF";
189Pick one target type from
190	elf	- Linux, FreeBSD, Solaris x86, etc.
191	a.out	- DJGPP, elder OpenBSD, etc.
192	coff	- GAS/COFF such as Win32 targets
193	win32n	- Windows 95/Windows NT NASM format
194	nw-nasm - NetWare NASM format
195	macosx	- Mac OS X
196EOF
197	exit(1);
198    }
199
200    $pic=0;
201    for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
202
203    $filename =~ s/\.pl$//;
204    &file($filename);
205}
206
2071;
208