crypto/perlasm/x86unix.pl

   1 #!/usr/local/bin/perl
   2
   3 package x86unix;        # GAS actually...
   4
   5 $label="L000";
   6 $const="";
   7 $constl=0;
   8
   9 $align=($main'aout)?"4":"16";
  10 $under=($main'aout or $main'coff)?"_":"";
  11 $dot=($main'aout)?"":".";
  12 $com_start="#" if ($main'aout or $main'coff);
  13
  14 sub main'asm_init_output { @out=(); }
  15 sub main'asm_get_output { return(@out); }
  16 sub main'get_labels { return(@labels); }
  17 sub main'external_label { push(@labels,@_); }
  18
  19 if ($main'cpp)
  20         {
  21         $align="ALIGN";
  22         $under="";
  23         $com_start='/*';
  24         $com_end='*/';
  25         }
  26
  27 %lb=(   'eax',  '%al',
  28         'ebx',  '%bl',
  29         'ecx',  '%cl',
  30         'edx',  '%dl',
  31         'ax',   '%al',
  32         'bx',   '%bl',
  33         'cx',   '%cl',
  34         'dx',   '%dl',
  35         );
  36
  37 %hb=(   'eax',  '%ah',
  38         'ebx',  '%bh',
  39         'ecx',  '%ch',
  40         'edx',  '%dh',
  41         'ax',   '%ah',
  42         'bx',   '%bh',
  43         'cx',   '%ch',
  44         'dx',   '%dh',
  45         );
  46
  47 %regs=( 'eax',  '%eax',
  48         'ebx',  '%ebx',
  49         'ecx',  '%ecx',
  50         'edx',  '%edx',
  51         'esi',  '%esi',
  52         'edi',  '%edi',
  53         'ebp',  '%ebp',
  54         'esp',  '%esp',
  55
  56         'mm0',  '%mm0',
  57         'mm1',  '%mm1',
  58         'mm2',  '%mm2',
  59         'mm3',  '%mm3',
  60         'mm4',  '%mm4',
  61         'mm5',  '%mm5',
  62         'mm6',  '%mm6',
  63         'mm7',  '%mm7',
  64
  65         'xmm0', '%xmm0',
  66         'xmm1', '%xmm1',
  67         'xmm2', '%xmm2',
  68         'xmm3', '%xmm3',
  69         'xmm4', '%xmm4',
  70         'xmm5', '%xmm5',
  71         'xmm6', '%xmm6',
  72         'xmm7', '%xmm7',
  73         );
  74
  75 %reg_val=(
  76         'eax',  0x00,
  77         'ebx',  0x03,
  78         'ecx',  0x01,
  79         'edx',  0x02,
  80         'esi',  0x06,
  81         'edi',  0x07,
  82         'ebp',  0x05,
  83         'esp',  0x04,
  84         );
  85
  86 sub main'LB
  87         {
  88         (defined($lb{$_[0]})) || die "$_[0] does not have a 'low byte'\n";
  89         return($lb{$_[0]});
  90         }
  91
  92 sub main'HB
  93         {
  94         (defined($hb{$_[0]})) || die "$_[0] does not have a 'high byte'\n";
  95         return($hb{$_[0]});
  96         }
  97
  98 sub main'DWP
  99         {
 100         local($addr,$reg1,$reg2,$idx)=@_;
 101
 102         $ret="";
 103         $addr =~ s/(^|[+ \t])([A-Za-z_]+[A-Za-z0-9_]+)($|[+ \t])/$1$under$2$3/;
 104         $reg1="$regs{$reg1}" if defined($regs{$reg1});
 105         $reg2="$regs{$reg2}" if defined($regs{$reg2});
 106         $ret.=$addr if ($addr ne "") && ($addr ne 0);
 107         if ($reg2 ne "")
 108                 {
 109                 if($idx ne "" && $idx != 0)
 110                     { $ret.="($reg1,$reg2,$idx)"; }
 111                 else
 112                     { $ret.="($reg1,$reg2)"; }
 113                 }
 114         elsif ($reg1 ne "")
 115                 { $ret.="($reg1)" }
 116         return($ret);
 117         }
 118
 119 sub main'QWP
 120         {
 121         return(&main'DWP(@_));
 122         }
 123
 124 sub main'BP
 125         {
 126         return(&main'DWP(@_));
 127         }
 128
 129 sub main'BC
 130         {
 131         return @_;
 132         }
 133
 134 sub main'DWC
 135         {
 136         return @_;
 137         }
 138
 139 #sub main'BP
 140 #       {
 141 #       local($addr,$reg1,$reg2,$idx)=@_;
 142 #
 143 #       $ret="";
 144 #
 145 #       $addr =~ s/(^|[+ \t])([A-Za-z_]+)($|[+ \t])/$1$under$2$3/;
 146 #       $reg1="$regs{$reg1}" if defined($regs{$reg1});
 147 #       $reg2="$regs{$reg2}" if defined($regs{$reg2});
 148 #       $ret.=$addr if ($addr ne "") && ($addr ne 0);
 149 #       if ($reg2 ne "")
 150 #               { $ret.="($reg1,$reg2,$idx)"; }
 151 #       else
 152 #               { $ret.="($reg1)" }
 153 #       return($ret);
 154 #       }
 155
 156 sub main'mov    { &out2("movl",@_); }
 157 sub main'movb   { &out2("movb",@_); }
 158 sub main'and    { &out2("andl",@_); }
 159 sub main'or     { &out2("orl",@_); }
 160 sub main'shl    { &out2("sall",@_); }
 161 sub main'shr    { &out2("shrl",@_); }
 162 sub main'xor    { &out2("xorl",@_); }
 163 sub main'xorb   { &out2("xorb",@_); }
 164 sub main'add    { &out2($_[0]=~/%[a-d][lh]/?"addb":"addl",@_); }
 165 sub main'adc    { &out2("adcl",@_); }
 166 sub main'sub    { &out2("subl",@_); }
 167 sub main'sbb    { &out2("sbbl",@_); }
 168 sub main'rotl   { &out2("roll",@_); }
 169 sub main'rotr   { &out2("rorl",@_); }
 170 sub main'exch   { &out2($_[0]=~/%[a-d][lh]/?"xchgb":"xchgl",@_); }
 171 sub main'cmp    { &out2("cmpl",@_); }
 172 sub main'lea    { &out2("leal",@_); }
 173 sub main'mul    { &out1("mull",@_); }
 174 sub main'div    { &out1("divl",@_); }
 175 sub main'jmp    { &out1("jmp",@_); }
 176 sub main'jmp_ptr { &out1p("jmp",@_); }
 177 sub main'je     { &out1("je",@_); }
 178 sub main'jle    { &out1("jle",@_); }
 179 sub main'jne    { &out1("jne",@_); }
 180 sub main'jnz    { &out1("jnz",@_); }
 181 sub main'jz     { &out1("jz",@_); }
 182 sub main'jge    { &out1("jge",@_); }
 183 sub main'jl     { &out1("jl",@_); }
 184 sub main'ja     { &out1("ja",@_); }
 185 sub main'jae    { &out1("jae",@_); }
 186 sub main'jb     { &out1("jb",@_); }
 187 sub main'jbe    { &out1("jbe",@_); }
 188 sub main'jc     { &out1("jc",@_); }
 189 sub main'jnc    { &out1("jnc",@_); }
 190 sub main'jno    { &out1("jno",@_); }
 191 sub main'dec    { &out1("decl",@_); }
 192 sub main'inc    { &out1($_[0]=~/%[a-d][hl]/?"incb":"incl",@_); }
 193 sub main'push   { &out1("pushl",@_); $stack+=4; }
 194 sub main'pop    { &out1("popl",@_); $stack-=4; }
 195 sub main'pushf  { &out0("pushfl"); $stack+=4; }
 196 sub main'popf   { &out0("popfl"); $stack-=4; }
 197 sub main'not    { &out1("notl",@_); }
 198 sub main'call   {       my $pre=$under;
 199                         foreach $i (%label)
 200                         { if ($label{$i} eq $_[0]) { $pre=''; last; } }
 201                         &out1("call",$pre.$_[0]);
 202                 }
 203 sub main'ret    { &out0("ret"); }
 204 sub main'nop    { &out0("nop"); }
 205 sub main'test   { &out2("testl",@_); }
 206 sub main'bt     { &out2("btl",@_); }
 207 sub main'leave  { &out0("leave"); }
 208 sub main'cpuid  { &out0(".byte\t0x0f,0xa2"); }
 209 sub main'rdtsc  { &out0(".byte\t0x0f,0x31"); }
 210 sub main'halt   { &out0("hlt"); }
 211 sub main'movz   { &out2("movzbl",@_); }
 212 sub main'neg    { &out1("negl",@_); }
 213
 214 # SSE2
 215 sub main'emms   { &out0("emms"); }
 216 sub main'movd   { &out2("movd",@_); }
 217 sub main'movq   { &out2("movq",@_); }
 218 sub main'movdqu { &out2("movdqu",@_); }
 219 sub main'movdqa { &out2("movdqa",@_); }
 220 sub main'movdq2q{ &out2("movdq2q",@_); }
 221 sub main'movq2dq{ &out2("movq2dq",@_); }
 222 sub main'paddq  { &out2("paddq",@_); }
 223 sub main'pmuludq{ &out2("pmuludq",@_); }
 224 sub main'psrlq  { &out2("psrlq",@_); }
 225 sub main'psllq  { &out2("psllq",@_); }
 226 sub main'pxor   { &out2("pxor",@_); }
 227 sub main'por    { &out2("por",@_); }
 228 sub main'pand   { &out2("pand",@_); }
 229
 230 # The bswapl instruction is new for the 486. Emulate if i386.
 231 sub main'bswap
 232         {
 233         if ($main'i386)
 234                 {
 235                 &main'comment("bswapl @_");
 236                 &main'exch(main'HB(@_),main'LB(@_));
 237                 &main'rotr(@_,16);
 238                 &main'exch(main'HB(@_),main'LB(@_));
 239                 }
 240         else
 241                 {
 242                 &out1("bswapl",@_);
 243                 }
 244         }
 245
 246 sub out2
 247         {
 248         local($name,$p1,$p2)=@_;
 249         local($l,$ll,$t);
 250         local(%special)=(       "roll",0xD1C0,"rorl",0xD1C8,
 251                                 "rcll",0xD1D0,"rcrl",0xD1D8,
 252                                 "shll",0xD1E0,"shrl",0xD1E8,
 253                                 "sarl",0xD1F8);
 254
 255         if ((defined($special{$name})) && defined($regs{$p1}) && ($p2 == 1))
 256                 {
 257                 $op=$special{$name}|$reg_val{$p1};
 258                 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
 259                 $tmp2=sprintf(".byte %d\t",$op     &0xff);
 260                 push(@out,$tmp1);
 261                 push(@out,$tmp2);
 262
 263                 $p2=&conv($p2);
 264                 $p1=&conv($p1);
 265                 &main'comment("$name $p2 $p1");
 266                 return;
 267                 }
 268
 269         push(@out,"\t$name\t");
 270         $t=&conv($p2).",";
 271         $l=length($t);
 272         push(@out,$t);
 273         $ll=4-($l+9)/8;
 274         $tmp1=sprintf("\t" x $ll);
 275         push(@out,$tmp1);
 276         push(@out,&conv($p1)."\n");
 277         }
 278
 279 sub out1
 280         {
 281         local($name,$p1)=@_;
 282         local($l,$t);
 283         local(%special)=("bswapl",0x0FC8);
 284
 285         if ((defined($special{$name})) && defined($regs{$p1}))
 286                 {
 287                 $op=$special{$name}|$reg_val{$p1};
 288                 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
 289                 $tmp2=sprintf(".byte %d\t",$op     &0xff);
 290                 push(@out,$tmp1);
 291                 push(@out,$tmp2);
 292
 293                 $p2=&conv($p2);
 294                 $p1=&conv($p1);
 295                 &main'comment("$name $p2 $p1");
 296                 return;
 297                 }
 298
 299         push(@out,"\t$name\t".&conv($p1)."\n");
 300         }
 301
 302 sub out1p
 303         {
 304         local($name,$p1)=@_;
 305         local($l,$t);
 306
 307         push(@out,"\t$name\t*".&conv($p1)."\n");
 308         }
 309
 310 sub out0
 311         {
 312         push(@out,"\t$_[0]\n");
 313         }
 314
 315 sub conv
 316         {
 317         local($p)=@_;
 318
 319 #       $p =~ s/0x([0-9A-Fa-f]+)/0$1h/;
 320
 321         $p=$regs{$p} if (defined($regs{$p}));
 322
 323         $p =~ s/^(-{0,1}[0-9A-Fa-f]+)$/\$$1/;
 324         $p =~ s/^(0x[0-9A-Fa-f]+)$/\$$1/;
 325         return $p;
 326         }
 327
 328 sub main'file
 329         {
 330         local($file)=@_;
 331
 332         local($tmp)=<<"EOF";
 333         .file   "$file.s"
 334 EOF
 335         push(@out,$tmp);
 336         }
 337
 338 sub main'function_begin
 339         {
 340         local($func)=@_;
 341
 342         &main'external_label($func);
 343         $func=$under.$func;
 344
 345         local($tmp)=<<"EOF";
 346 .text
 347 .globl  $func
 348 EOF
 349         push(@out,$tmp);
 350         if ($main'cpp)
 351                 { $tmp=push(@out,"TYPE($func,\@function)\n"); }
 352         elsif ($main'coff)
 353                 { $tmp=push(@out,".def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
 354         elsif ($main'aout and !$main'pic)
 355                 { }
 356         else    { $tmp=push(@out,".type\t$func,\@function\n"); }
 357         push(@out,".align\t$align\n");
 358         push(@out,"$func:\n");
 359         $tmp=<<"EOF";
 360         pushl   %ebp
 361         pushl   %ebx
 362         pushl   %esi
 363         pushl   %edi
 364
 365 EOF
 366         push(@out,$tmp);
 367         $stack=20;
 368         }
 369
 370 sub main'function_begin_B
 371         {
 372         local($func,$extra)=@_;
 373
 374         &main'external_label($func);
 375         $func=$under.$func;
 376
 377         local($tmp)=<<"EOF";
 378 .text
 379 .globl  $func
 380 EOF
 381         push(@out,$tmp);
 382         if ($main'cpp)
 383                 { push(@out,"TYPE($func,\@function)\n"); }
 384         elsif ($main'coff)
 385                 { $tmp=push(@out,".def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
 386         elsif ($main'aout and !$main'pic)
 387                 { }
 388         else    { push(@out,".type      $func,\@function\n"); }
 389         push(@out,".align\t$align\n");
 390         push(@out,"$func:\n");
 391         $stack=4;
 392         }
 393
 394 sub main'function_end
 395         {
 396         local($func)=@_;
 397
 398         $func=$under.$func;
 399
 400         local($tmp)=<<"EOF";
 401         popl    %edi
 402         popl    %esi
 403         popl    %ebx
 404         popl    %ebp
 405         ret
 406 ${dot}L_${func}_end:
 407 EOF
 408         push(@out,$tmp);
 409
 410         if ($main'cpp)
 411                 { push(@out,"SIZE($func,${dot}L_${func}_end-$func)\n"); }
 412         elsif ($main'coff or $main'aout)
 413                 { }
 414         else    { push(@out,".size\t$func,${dot}L_${func}_end-$func\n"); }
 415         push(@out,".ident       \"$func\"\n");
 416         $stack=0;
 417         %label=();
 418         }
 419
 420 sub main'function_end_A
 421         {
 422         local($func)=@_;
 423
 424         local($tmp)=<<"EOF";
 425         popl    %edi
 426         popl    %esi
 427         popl    %ebx
 428         popl    %ebp
 429         ret
 430 EOF
 431         push(@out,$tmp);
 432         }
 433
 434 sub main'function_end_B
 435         {
 436         local($func)=@_;
 437
 438         $func=$under.$func;
 439
 440         push(@out,"${dot}L_${func}_end:\n");
 441         if ($main'cpp)
 442                 { push(@out,"SIZE($func,${dot}L_${func}_end-$func)\n"); }
 443         elsif ($main'coff or $main'aout)
 444                 { }
 445         else    { push(@out,".size\t$func,${dot}L_${func}_end-$func\n"); }
 446         push(@out,".ident       \"$func\"\n");
 447         $stack=0;
 448         %label=();
 449         }
 450
 451 sub main'wparam
 452         {
 453         local($num)=@_;
 454
 455         return(&main'DWP($stack+$num*4,"esp","",0));
 456         }
 457
 458 sub main'stack_push
 459         {
 460         local($num)=@_;
 461         $stack+=$num*4;
 462         &main'sub("esp",$num*4);
 463         }
 464
 465 sub main'stack_pop
 466         {
 467         local($num)=@_;
 468         $stack-=$num*4;
 469         &main'add("esp",$num*4);
 470         }
 471
 472 sub main'swtmp
 473         {
 474         return(&main'DWP($_[0]*4,"esp","",0));
 475         }
 476
 477 # Should use swtmp, which is above esp.  Linix can trash the stack above esp
 478 #sub main'wtmp
 479 #       {
 480 #       local($num)=@_;
 481 #
 482 #       return(&main'DWP(-($num+1)*4,"esp","",0));
 483 #       }
 484
 485 sub main'comment
 486         {
 487         if (!defined($com_start) or $main'elf)
 488                 {       # Regarding $main'elf above...
 489                         # GNU and SVR4 as'es use different comment delimiters,
 490                 push(@out,"\n");        # so we just skip ELF comments...
 491                 return;
 492                 }
 493         foreach (@_)
 494                 {
 495                 if (/^\s*$/)
 496                         { push(@out,"\n"); }
 497                 else
 498                         { push(@out,"\t$com_start $_ $com_end\n"); }
 499                 }
 500         }
 501
 502 sub main'public_label
 503         {
 504         $label{$_[0]}="${under}${_[0]}" if (!defined($label{$_[0]}));
 505         push(@out,".globl\t$label{$_[0]}\n");
 506         }
 507
 508 sub main'label
 509         {
 510         if (!defined($label{$_[0]}))
 511                 {
 512                 $label{$_[0]}="${dot}${label}${_[0]}";
 513                 $label++;
 514                 }
 515         return($label{$_[0]});
 516         }
 517
 518 sub main'set_label
 519         {
 520         if (!defined($label{$_[0]}))
 521                 {
 522                 $label{$_[0]}="${dot}${label}${_[0]}";
 523                 $label++;
 524                 }
 525         if ($_[1]!=0)
 526                 {
 527                 if ($_[1]>1)    { main'align($_[1]);            }
 528                 else            { push(@out,".align $align\n"); }
 529                 }
 530         push(@out,"$label{$_[0]}:\n");
 531         }
 532
 533 sub main'file_end
 534         {
 535         # try to detect if SSE2 or MMX extensions were used on ELF platform...
 536         if ($main'elf && grep {/%[x]*mm[0-7]/i} @out) {
 537                 local($tmp);
 538
 539                 push (@out,"\n.comm\t${under}OPENSSL_ia32cap_P,4,4\n");
 540
 541                 push (@out,".section\t.init\n");
 542                 # One can argue that it's wasteful to craft every
 543                 # SSE/MMX module with this snippet... Well, it's 72
 544                 # bytes long and for the moment we have two modules.
 545                 # Let's argue when we have 7 modules or so...
 546                 #
 547                 # $1<<10 sets a reserved bit to signal that variable
 548                 # was initialized already...
 549                 &main'picmeup("edx","OPENSSL_ia32cap_P");
 550                 $tmp=<<___;
 551                 cmpl    \$0,(%edx)
 552                 jne     1f
 553                 movl    \$1<<10,(%edx)
 554                 pushf
 555                 popl    %eax
 556                 movl    %eax,%ecx
 557                 xorl    \$1<<21,%eax
 558                 pushl   %eax
 559                 popf
 560                 pushf
 561                 popl    %eax
 562                 xorl    %ecx,%eax
 563                 btl     \$21,%eax
 564                 jnc     1f
 565                 pushl   %edi
 566                 pushl   %ebx
 567                 movl    %edx,%edi
 568                 movl    \$1,%eax
 569                 .byte   0x0f,0xa2
 570                 orl     \$1<<10,%edx
 571                 movl    %edx,0(%edi)
 572                 popl    %ebx
 573                 popl    %edi
 574         .align  $align
 575         1:
 576 ___
 577                 push (@out,$tmp);
 578         }
 579
 580         if ($const ne "")
 581                 {
 582                 push(@out,".section .rodata\n");
 583                 push(@out,$const);
 584                 $const="";
 585                 }
 586         }
 587
 588 sub main'data_word
 589         {
 590         push(@out,"\t.long\t".join(',',@_)."\n");
 591         }
 592
 593 sub main'align
 594         {
 595         my $val=$_[0],$p2,$i;
 596         if ($main'aout) {
 597                 for ($p2=0;$val!=0;$val>>=1) { $p2++; }
 598                 $val=$p2-1;
 599                 $val.=",0x90";
 600         }
 601         push(@out,".align\t$val\n");
 602         }
 603
 604 # debug output functions: puts, putx, printf
 605
 606 sub main'puts
 607         {
 608         &pushvars();
 609         &main'push('$Lstring' . ++$constl);
 610         &main'call('puts');
 611         $stack-=4;
 612         &main'add("esp",4);
 613         &popvars();
 614
 615         $const .= "Lstring$constl:\n\t.string \"@_[0]\"\n";
 616         }
 617
 618 sub main'putx
 619         {
 620         &pushvars();
 621         &main'push($_[0]);
 622         &main'push('$Lstring' . ++$constl);
 623         &main'call('printf');
 624         &main'add("esp",8);
 625         $stack-=8;
 626         &popvars();
 627
 628         $const .= "Lstring$constl:\n\t.string \"\%X\"\n";
 629         }
 630
 631 sub main'printf
 632         {
 633         $ostack = $stack;
 634         &pushvars();
 635         for ($i = @_ - 1; $i >= 0; $i--)
 636                 {
 637                 if ($i == 0) # change this to support %s format strings
 638                         {
 639                         &main'push('$Lstring' . ++$constl);
 640                         $const .= "Lstring$constl:\n\t.string \"@_[$i]\"\n";
 641                         }
 642                 else
 643                         {
 644                         if ($_[$i] =~ /([0-9]*)\(%esp\)/)
 645                                 {
 646                                 &main'push(($1 + $stack - $ostack) . '(%esp)');
 647                                 }
 648                         else
 649                                 {
 650                                 &main'push($_[$i]);
 651                                 }
 652                         }
 653                 }
 654         &main'call('printf');
 655         $stack-=4*@_;
 656         &main'add("esp",4*@_);
 657         &popvars();
 658         }
 659
 660 sub pushvars
 661         {
 662         &main'pushf();
 663         &main'push("edx");
 664         &main'push("ecx");
 665         &main'push("eax");
 666         }
 667
 668 sub popvars
 669         {
 670         &main'pop("eax");
 671         &main'pop("ecx");
 672         &main'pop("edx");
 673         &main'popf();
 674         }
 675
 676 sub main'picmeup
 677         {
 678         local($dst,$sym)=@_;
 679         if ($main'cpp)
 680                 {
 681                 local($tmp)=<<___;
 682 #if (defined(ELF) || defined(SOL)) && defined(PIC)
 683         call    1f
 684 1:      popl    $regs{$dst}
 685         addl    \$_GLOBAL_OFFSET_TABLE_+[.-1b],$regs{$dst}
 686         movl    $sym\@GOT($regs{$dst}),$regs{$dst}
 687 #else
 688         leal    $sym,$regs{$dst}
 689 #endif
 690 ___
 691                 push(@out,$tmp);
 692                 }
 693         elsif ($main'pic && ($main'elf || $main'aout))
 694                 {
 695                 &main'call(&main'label("PIC_me_up"));
 696                 &main'set_label("PIC_me_up");
 697                 &main'blindpop($dst);
 698                 &main'add($dst,"\$${under}_GLOBAL_OFFSET_TABLE_+[.-".
 699                                 &main'label("PIC_me_up") . "]");
 700                 &main'mov($dst,&main'DWP($under.$sym."\@GOT",$dst));
 701                 }
 702         else
 703                 {
 704                 &main'lea($dst,&main'DWP($sym));
 705                 }
 706         }
 707
 708 sub main'blindpop { &out1("popl",@_); }
 709
 710 sub main'initseg
 711         {
 712         local($f)=@_;
 713         local($tmp);
 714         if ($main'elf)
 715                 {
 716                 $tmp=<<___;
 717 .section        .init
 718         call    $under$f
 719         .align  $align
 720 ___
 721                 }
 722         elsif ($main'coff)
 723                 {
 724                 $tmp=<<___;     # applies to both Cygwin and Mingw
 725 .section        .ctors
 726 .long   $under$f
 727 ___
 728                 }
 729         elsif ($main'aout)
 730                 {
 731                 local($ctor)="${under}_GLOBAL_\$I\$$f";
 732                 $tmp=".text\n";
 733                 $tmp.=".type    $ctor,\@function\n" if ($main'pic);
 734                 $tmp.=<<___;    # OpenBSD way...
 735 .globl  $ctor
 736 .align  2
 737 $ctor:
 738         jmp     $under$f
 739 ___
 740                 }
 741         push(@out,$tmp) if ($tmp);
 742         }
 743
 744 1;