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...
17 sub ::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
29 sub ::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
36 sub ::LB
37 { $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
38 $1."l";
39 }
40 sub ::HB
41 { $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
42 $1."h";
43 }
44 sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); }
45 sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); }
46 sub ::blindpop { &pop($_[0]); $stack+=4; }
47 sub ::wparam { &DWP($stack+4*$_[0],"esp"); }
48 sub ::swtmp { &DWP(4*$_[0],"esp"); }
49
50 sub ::bswap
51 { if ($i386) # emulate bswap for i386
52 { &comment("bswap @_");
53 &xchg(&HB(@_),&LB(@_));
54 &ror (@_,16);
55 &xchg(&HB(@_),&LB(@_));
56 }
57 else
58 { &generic("bswap",@_); }
59 }
60 # These are made-up opcodes introduced over the years essentially
61 # by ignorance, just alias them to real ones...
62 sub ::movb { &mov(@_); }
63 sub ::xorb { &xor(@_); }
64 sub ::rotl { &rol(@_); }
65 sub ::rotr { &ror(@_); }
66 sub ::exch { &xchg(@_); }
67 sub ::halt { &hlt; }
68 sub ::movz { &movzx(@_); }
69 sub ::pushf { &pushfd; }
70 sub ::popf { &popfd; }
71
72 # 3 argument instructions
73 sub ::movq
74 { my($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
84 my %regrm = ( "eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
85 "esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7 );
86 sub ::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
94 sub ::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
102 sub ::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)|$2); }
106 else
107 { &::generic("pshufb",@_); }
108 }
109
110 sub ::palignr
111 { my($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
118 sub ::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
126 sub ::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
134 # label management
135 $lbdecor="L"; # local label decoration, set by package
136 $label="000";
137
138 sub ::islabel # see is argument is a known label
139 { my $i;
140 foreach $i (values %label) { return $i if ($i eq $_[0]); }
141 $label{$_[0]}; # can be undef
142 }
143
144 sub ::label # instantiate a function-scope label
145 { if (!defined($label{$_[0]}))
146 { $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; }
147 $label{$_[0]};
148 }
149
150 sub ::LABEL # instantiate a file-scope label
151 { $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
152 $label{$_[0]};
153 }
154
155 sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); }
156
157 sub ::set_label_B { push(@out,"@_:\n"); }
158 sub ::set_label
159 { my $label=&::label($_[0]);
160 &::align($_[1]) if ($_[1]>1);
161 &::set_label_B($label);
162 $label;
163 }
164
165 sub ::wipe_labels # wipes function-scope labels
166 { foreach $i (keys %label)
167 { delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
168 }
169
170 # subroutine management
171 sub ::function_begin
172 { &function_begin_B(@_);
173 $stack=4;
174 &push("ebp");
175 &push("ebx");
176 &push("esi");
177 &push("edi");
178 }
179
180 sub ::function_end
181 { &pop("edi");
182 &pop("esi");
183 &pop("ebx");
184 &pop("ebp");
185 &ret();
186 &function_end_B(@_);
187 $stack=0;
188 &wipe_labels();
189 }
190
191 sub ::function_end_A
192 { &pop("edi");
193 &pop("esi");
194 &pop("ebx");
195 &pop("ebp");
196 &ret();
197 $stack+=16; # readjust esp as if we didn't pop anything
198 }
199
200 sub ::asciz
201 { my @str=unpack("C*",shift);
202 push @str,0;
203 while ($#str>15) {
204 &data_byte(@str[0..15]);
205 foreach (0..15) { shift @str; }
206 }
207 &data_byte(@str) if (@str);
208 }
209
210 sub ::asm_finish
211 { &file_end();
212 print @out;
213 }
214
215 sub ::asm_init
216 { my ($type,$fn,$cpu)=@_;
217
218 $filename=$fn;
219 $i386=$cpu;
220
221 $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=$android=0;
222 if (($type eq "elf"))
223 { $elf=1; require "x86gas.pl"; }
224 elsif (($type eq "a\.out"))
225 { $aout=1; require "x86gas.pl"; }
226 elsif (($type eq "coff" or $type eq "gaswin"))
227 { $coff=1; require "x86gas.pl"; }
228 elsif (($type eq "win32n"))
229 { $win32=1; require "x86nasm.pl"; }
230 elsif (($type eq "nw-nasm"))
231 { $netware=1; require "x86nasm.pl"; }
232 #elsif (($type eq "nw-mwasm"))
233 #{ $netware=1; $mwerks=1; require "x86nasm.pl"; }
234 elsif (($type eq "win32"))
235 { $win32=1; require "x86masm.pl"; }
236 elsif (($type eq "macosx"))
237 { $aout=1; $macosx=1; require "x86gas.pl"; }
238 elsif (($type eq "android"))
239 { $elf=1; $android=1; require "x86gas.pl"; }
240 else
241 { print STDERR <<"EOF";
242 Pick one target type from
243 elf - Linux, FreeBSD, Solaris x86, etc.
244 a.out - DJGPP, elder OpenBSD, etc.
245 coff - GAS/COFF such as Win32 targets
246 win32n - Windows 95/Windows NT NASM format
247 nw-nasm - NetWare NASM format
248 macosx - Mac OS X
249 EOF
250 exit(1);
251 }
252
253 $pic=0;
254 for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
255
256 $filename =~ s/\.pl$//;
257 &file($filename);
258 }
259
260 1;