At least OpenBSD implements PIC in the same way ELF does.
[openssl.git] / crypto / perlasm / x86unix.pl
1 #!/usr/local/bin/perl
2
3 package x86unix;
4
5 $label="L000";
6 $const="";
7 $constl=0;
8
9 $align=($main'aout)?"4":"16";
10 $under=($main'aout)?"_":"";
11 $com_start=($main'sol)?"/":"#";
12
13 sub main'asm_init_output { @out=(); }
14 sub main'asm_get_output { return(@out); }
15 sub main'get_labels { return(@labels); }
16 sub main'external_label { push(@labels,@_); }
17
18 if ($main'cpp)
19         {
20         $align="ALIGN";
21         $under="";
22         $com_start='/*';
23         $com_end='*/';
24         }
25
26 %lb=(   'eax',  '%al',
27         'ebx',  '%bl',
28         'ecx',  '%cl',
29         'edx',  '%dl',
30         'ax',   '%al',
31         'bx',   '%bl',
32         'cx',   '%cl',
33         'dx',   '%dl',
34         );
35
36 %hb=(   'eax',  '%ah',
37         'ebx',  '%bh',
38         'ecx',  '%ch',
39         'edx',  '%dh',
40         'ax',   '%ah',
41         'bx',   '%bh',
42         'cx',   '%ch',
43         'dx',   '%dh',
44         );
45
46 %regs=( 'eax',  '%eax',
47         'ebx',  '%ebx',
48         'ecx',  '%ecx',
49         'edx',  '%edx',
50         'esi',  '%esi',
51         'edi',  '%edi',
52         'ebp',  '%ebp',
53         'esp',  '%esp',
54         );
55
56 %reg_val=(
57         'eax',  0x00,
58         'ebx',  0x03,
59         'ecx',  0x01,
60         'edx',  0x02,
61         'esi',  0x06,
62         'edi',  0x07,
63         'ebp',  0x05,
64         'esp',  0x04,
65         );
66
67 sub main'LB
68         {
69         (defined($lb{$_[0]})) || die "$_[0] does not have a 'low byte'\n";
70         return($lb{$_[0]});
71         }
72
73 sub main'HB
74         {
75         (defined($hb{$_[0]})) || die "$_[0] does not have a 'high byte'\n";
76         return($hb{$_[0]});
77         }
78
79 sub main'DWP
80         {
81         local($addr,$reg1,$reg2,$idx)=@_;
82
83         $ret="";
84         $addr =~ s/(^|[+ \t])([A-Za-z_]+[A-Za-z0-9_]+)($|[+ \t])/$1$under$2$3/;
85         $reg1="$regs{$reg1}" if defined($regs{$reg1});
86         $reg2="$regs{$reg2}" if defined($regs{$reg2});
87         $ret.=$addr if ($addr ne "") && ($addr ne 0);
88         if ($reg2 ne "")
89                 {
90                 if($idx ne "" && $idx != 0)
91                     { $ret.="($reg1,$reg2,$idx)"; }
92                 else
93                     { $ret.="($reg1,$reg2)"; }
94                 }
95         elsif ($reg1 ne "")
96                 { $ret.="($reg1)" }
97         return($ret);
98         }
99
100 sub main'BP
101         {
102         return(&main'DWP(@_));
103         }
104
105 sub main'BC
106         {
107         return @_;
108         }
109
110 sub main'DWC
111         {
112         return @_;
113         }
114
115 #sub main'BP
116 #       {
117 #       local($addr,$reg1,$reg2,$idx)=@_;
118 #
119 #       $ret="";
120 #
121 #       $addr =~ s/(^|[+ \t])([A-Za-z_]+)($|[+ \t])/$1$under$2$3/;
122 #       $reg1="$regs{$reg1}" if defined($regs{$reg1});
123 #       $reg2="$regs{$reg2}" if defined($regs{$reg2});
124 #       $ret.=$addr if ($addr ne "") && ($addr ne 0);
125 #       if ($reg2 ne "")
126 #               { $ret.="($reg1,$reg2,$idx)"; }
127 #       else
128 #               { $ret.="($reg1)" }
129 #       return($ret);
130 #       }
131
132 sub main'mov    { &out2("movl",@_); }
133 sub main'movb   { &out2("movb",@_); }
134 sub main'and    { &out2("andl",@_); }
135 sub main'or     { &out2("orl",@_); }
136 sub main'shl    { &out2("sall",@_); }
137 sub main'shr    { &out2("shrl",@_); }
138 sub main'xor    { &out2("xorl",@_); }
139 sub main'xorb   { &out2("xorb",@_); }
140 sub main'add    { &out2("addl",@_); }
141 sub main'adc    { &out2("adcl",@_); }
142 sub main'sub    { &out2("subl",@_); }
143 sub main'rotl   { &out2("roll",@_); }
144 sub main'rotr   { &out2("rorl",@_); }
145 sub main'exch   { &out2("xchg",@_); }
146 sub main'cmp    { &out2("cmpl",@_); }
147 sub main'lea    { &out2("leal",@_); }
148 sub main'mul    { &out1("mull",@_); }
149 sub main'div    { &out1("divl",@_); }
150 sub main'jmp    { &out1("jmp",@_); }
151 sub main'jmp_ptr { &out1p("jmp",@_); }
152 sub main'je     { &out1("je",@_); }
153 sub main'jle    { &out1("jle",@_); }
154 sub main'jne    { &out1("jne",@_); }
155 sub main'jnz    { &out1("jnz",@_); }
156 sub main'jz     { &out1("jz",@_); }
157 sub main'jge    { &out1("jge",@_); }
158 sub main'jl     { &out1("jl",@_); }
159 sub main'jb     { &out1("jb",@_); }
160 sub main'jc     { &out1("jc",@_); }
161 sub main'jnc    { &out1("jnc",@_); }
162 sub main'jno    { &out1("jno",@_); }
163 sub main'dec    { &out1("decl",@_); }
164 sub main'inc    { &out1("incl",@_); }
165 sub main'push   { &out1("pushl",@_); $stack+=4; }
166 sub main'pop    { &out1("popl",@_); $stack-=4; }
167 sub main'pushf  { &out0("pushf"); $stack+=4; }
168 sub main'popf   { &out0("popf"); $stack-=4; }
169 sub main'not    { &out1("notl",@_); }
170 sub main'call   { &out1("call",($_[0]=~/^\.L/?'':$under).$_[0]); }
171 sub main'ret    { &out0("ret"); }
172 sub main'nop    { &out0("nop"); }
173
174 # The bswapl instruction is new for the 486. Emulate if i386.
175 sub main'bswap
176         {
177         if ($main'i386)
178                 {
179                 &main'comment("bswapl @_");
180                 &main'exch(main'HB(@_),main'LB(@_));
181                 &main'rotr(@_,16);
182                 &main'exch(main'HB(@_),main'LB(@_));
183                 }
184         else
185                 {
186                 &out1("bswapl",@_);
187                 }
188         }
189
190 sub out2
191         {
192         local($name,$p1,$p2)=@_;
193         local($l,$ll,$t);
194         local(%special)=(       "roll",0xD1C0,"rorl",0xD1C8,
195                                 "rcll",0xD1D0,"rcrl",0xD1D8,
196                                 "shll",0xD1E0,"shrl",0xD1E8,
197                                 "sarl",0xD1F8);
198         
199         if ((defined($special{$name})) && defined($regs{$p1}) && ($p2 == 1))
200                 {
201                 $op=$special{$name}|$reg_val{$p1};
202                 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
203                 $tmp2=sprintf(".byte %d\t",$op     &0xff);
204                 push(@out,$tmp1);
205                 push(@out,$tmp2);
206
207                 $p2=&conv($p2);
208                 $p1=&conv($p1);
209                 &main'comment("$name $p2 $p1");
210                 return;
211                 }
212
213         push(@out,"\t$name\t");
214         $t=&conv($p2).",";
215         $l=length($t);
216         push(@out,$t);
217         $ll=4-($l+9)/8;
218         $tmp1=sprintf("\t" x $ll);
219         push(@out,$tmp1);
220         push(@out,&conv($p1)."\n");
221         }
222
223 sub out1
224         {
225         local($name,$p1)=@_;
226         local($l,$t);
227         local(%special)=("bswapl",0x0FC8);
228
229         if ((defined($special{$name})) && defined($regs{$p1}))
230                 {
231                 $op=$special{$name}|$reg_val{$p1};
232                 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
233                 $tmp2=sprintf(".byte %d\t",$op     &0xff);
234                 push(@out,$tmp1);
235                 push(@out,$tmp2);
236
237                 $p2=&conv($p2);
238                 $p1=&conv($p1);
239                 &main'comment("$name $p2 $p1");
240                 return;
241                 }
242
243         push(@out,"\t$name\t".&conv($p1)."\n");
244         }
245
246 sub out1p
247         {
248         local($name,$p1)=@_;
249         local($l,$t);
250
251         push(@out,"\t$name\t*".&conv($p1)."\n");
252         }
253
254 sub out0
255         {
256         push(@out,"\t$_[0]\n");
257         }
258
259 sub conv
260         {
261         local($p)=@_;
262
263 #       $p =~ s/0x([0-9A-Fa-f]+)/0$1h/;
264
265         $p=$regs{$p} if (defined($regs{$p}));
266
267         $p =~ s/^(-{0,1}[0-9A-Fa-f]+)$/\$$1/;
268         $p =~ s/^(0x[0-9A-Fa-f]+)$/\$$1/;
269         return $p;
270         }
271
272 sub main'file
273         {
274         local($file)=@_;
275
276         local($tmp)=<<"EOF";
277         .file   "$file.s"
278         .version        "01.01"
279 gcc2_compiled.:
280 EOF
281         push(@out,$tmp);
282         }
283
284 sub main'function_begin
285         {
286         local($func)=@_;
287
288         &main'external_label($func);
289         $func=$under.$func;
290
291         local($tmp)=<<"EOF";
292 .text
293         .align $align
294 .globl $func
295 EOF
296         push(@out,$tmp);
297         if ($main'cpp)
298                 { $tmp=push(@out,"\tTYPE($func,\@function)\n"); }
299         elsif ($main'gaswin)
300                 { $tmp=push(@out,"\t.def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
301         else    { $tmp=push(@out,"\t.type\t$func,\@function\n"); }
302         push(@out,"$func:\n");
303         $tmp=<<"EOF";
304         pushl   %ebp
305         pushl   %ebx
306         pushl   %esi
307         pushl   %edi
308
309 EOF
310         push(@out,$tmp);
311         $stack=20;
312         }
313
314 sub main'function_begin_B
315         {
316         local($func,$extra)=@_;
317
318         &main'external_label($func);
319         $func=$under.$func;
320
321         local($tmp)=<<"EOF";
322 .text
323         .align $align
324 .globl $func
325 EOF
326         push(@out,$tmp);
327         if ($main'cpp)
328                 { push(@out,"\tTYPE($func,\@function)\n"); }
329         elsif ($main'gaswin)
330                 { $tmp=push(@out,"\t.def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
331         else    { push(@out,"\t.type    $func,\@function\n"); }
332         push(@out,"$func:\n");
333         $stack=4;
334         }
335
336 sub main'function_end
337         {
338         local($func)=@_;
339
340         $func=$under.$func;
341
342         local($tmp)=<<"EOF";
343         popl    %edi
344         popl    %esi
345         popl    %ebx
346         popl    %ebp
347         ret
348 .${func}_end:
349 EOF
350         push(@out,$tmp);
351
352         if ($main'cpp)
353                 { push(@out,"\tSIZE($func,.${func}_end-$func)\n"); }
354         elsif ($main'gaswin)
355                 { $tmp=push(@out,"\t.align 4\n"); }
356         else    { push(@out,"\t.size\t$func,.${func}_end-$func\n"); }
357         push(@out,".ident       \"$func\"\n");
358         $stack=0;
359         %label=();
360         }
361
362 sub main'function_end_A
363         {
364         local($func)=@_;
365
366         local($tmp)=<<"EOF";
367         popl    %edi
368         popl    %esi
369         popl    %ebx
370         popl    %ebp
371         ret
372 EOF
373         push(@out,$tmp);
374         }
375
376 sub main'function_end_B
377         {
378         local($func)=@_;
379
380         $func=$under.$func;
381
382         push(@out,".L_${func}_end:\n");
383         if ($main'cpp)
384                 { push(@out,"\tSIZE($func,.L_${func}_end-$func)\n"); }
385         elsif ($main'gaswin)
386                 { push(@out,"\t.align 4\n"); }
387         else    { push(@out,"\t.size\t$func,.L_${func}_end-$func\n"); }
388         push(@out,".ident       \"desasm.pl\"\n");
389         $stack=0;
390         %label=();
391         }
392
393 sub main'wparam
394         {
395         local($num)=@_;
396
397         return(&main'DWP($stack+$num*4,"esp","",0));
398         }
399
400 sub main'stack_push
401         {
402         local($num)=@_;
403         $stack+=$num*4;
404         &main'sub("esp",$num*4);
405         }
406
407 sub main'stack_pop
408         {
409         local($num)=@_;
410         $stack-=$num*4;
411         &main'add("esp",$num*4);
412         }
413
414 sub main'swtmp
415         {
416         return(&main'DWP($_[0]*4,"esp","",0));
417         }
418
419 # Should use swtmp, which is above esp.  Linix can trash the stack above esp
420 #sub main'wtmp
421 #       {
422 #       local($num)=@_;
423 #
424 #       return(&main'DWP(-($num+1)*4,"esp","",0));
425 #       }
426
427 sub main'comment
428         {
429         if ($main'elf)  # GNU and SVR4 as'es use different comment delimiters,
430                 {       # so we just skip comments...
431                 push(@out,"\n");
432                 return;
433                 }
434         foreach (@_)
435                 {
436                 if (/^\s*$/)
437                         { push(@out,"\n"); }
438                 else
439                         { push(@out,"\t$com_start $_ $com_end\n"); }
440                 }
441         }
442
443 sub main'label
444         {
445         if (!defined($label{$_[0]}))
446                 {
447                 $label{$_[0]}=".${label}${_[0]}";
448                 $label++;
449                 }
450         return($label{$_[0]});
451         }
452
453 sub main'set_label
454         {
455         if (!defined($label{$_[0]}))
456                 {
457                 $label{$_[0]}=".${label}${_[0]}";
458                 $label++;
459                 }
460         push(@out,".align $align\n") if ($_[1] != 0);
461         push(@out,"$label{$_[0]}:\n");
462         }
463
464 sub main'file_end
465         {
466         if ($const ne "")
467                 {
468                 push(@out,".section .rodata\n");
469                 push(@out,$const);
470                 $const="";
471                 }
472         }
473
474 sub main'data_word
475         {
476         push(@out,"\t.long $_[0]\n");
477         }
478
479 # debug output functions: puts, putx, printf
480
481 sub main'puts
482         {
483         &pushvars();
484         &main'push('$Lstring' . ++$constl);
485         &main'call('puts');
486         $stack-=4;
487         &main'add("esp",4);
488         &popvars();
489
490         $const .= "Lstring$constl:\n\t.string \"@_[0]\"\n";
491         }
492
493 sub main'putx
494         {
495         &pushvars();
496         &main'push($_[0]);
497         &main'push('$Lstring' . ++$constl);
498         &main'call('printf');
499         &main'add("esp",8);
500         $stack-=8;
501         &popvars();
502
503         $const .= "Lstring$constl:\n\t.string \"\%X\"\n";
504         }
505
506 sub main'printf
507         {
508         $ostack = $stack;
509         &pushvars();
510         for ($i = @_ - 1; $i >= 0; $i--)
511                 {
512                 if ($i == 0) # change this to support %s format strings
513                         {
514                         &main'push('$Lstring' . ++$constl);
515                         $const .= "Lstring$constl:\n\t.string \"@_[$i]\"\n";
516                         }
517                 else
518                         {
519                         if ($_[$i] =~ /([0-9]*)\(%esp\)/)
520                                 {
521                                 &main'push(($1 + $stack - $ostack) . '(%esp)');
522                                 }
523                         else
524                                 {
525                                 &main'push($_[$i]);
526                                 }
527                         }
528                 }
529         &main'call('printf');
530         $stack-=4*@_;
531         &main'add("esp",4*@_);
532         &popvars();
533         }
534
535 sub pushvars
536         {
537         &main'pushf();
538         &main'push("edx");
539         &main'push("ecx");
540         &main'push("eax");
541         }
542
543 sub popvars
544         {
545         &main'pop("eax");
546         &main'pop("ecx");
547         &main'pop("edx");
548         &main'popf();
549         }
550
551 sub main'picmeup
552         {
553         local($dst,$sym)=@_;
554         if ($main'cpp)
555                 {
556                 local($tmp)=<<___;
557 #if (defined(ELF) || defined(SOL)) && defined(PIC)
558         .align  8
559         call    1f
560 1:      popl    $regs{$dst}
561         addl    \$_GLOBAL_OFFSET_TABLE_+[.-1b],$regs{$dst}
562         movl    $sym\@GOT($regs{$dst}),$regs{$dst}
563 #else
564         leal    $sym,$regs{$dst}
565 #endif
566 ___
567                 push(@out,$tmp);
568                 }
569         elsif ($main'pic && ($main'elf || $main'aout))
570                 {
571                 push(@out,"\t.align\t8\n");
572                 &main'call(&main'label("PIC_me_up"));
573                 &main'set_label("PIC_me_up");
574                 &main'blindpop($dst);
575                 &main'add($dst,"\$$under"."_GLOBAL_OFFSET_TABLE_+[.-".
576                                 &main'label("PIC_me_up") . "]");
577                 &main'mov($dst,&main'DWP($sym."\@GOT",$dst));
578                 }
579         else
580                 {
581                 &main'lea($dst,&main'DWP($sym));
582                 }
583         }
584
585 sub main'blindpop { &out1("popl",@_); }