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.$_[0]);
 202                 }
 203 sub main'ret    { &out0("ret"); }
 204 sub main'nop    { &out0("nop"); }
 205 sub main'test   { &out2("testl",@_); }
 206 sub main'bt     { &out2("btl",@_); }
 207 sub main'leave  { &out0("leave"); }
 208 sub main'cpuid  { &out0(".byte\t0x0f,0xa2"); }
 209 sub main'rdtsc  { &out0(".byte\t0x0f,0x31"); }
 210 sub main'halt   { &out0("hlt"); }
 211 sub main'movz   { &out2("movzbl",@_); }
 212 sub main'neg    { &out1("negl",@_); }
 213 sub main'cld    { &out0("cld"); }
 214
 215 # SSE2
 216 sub main'emms   { &out0("emms"); }
 217 sub main'movd   { &out2("movd",@_); }
 218 sub main'movq   { &out2("movq",@_); }
 219 sub main'movdqu { &out2("movdqu",@_); }
 220 sub main'movdqa { &out2("movdqa",@_); }
 221 sub main'movdq2q{ &out2("movdq2q",@_); }
 222 sub main'movq2dq{ &out2("movq2dq",@_); }
 223 sub main'paddq  { &out2("paddq",@_); }
 224 sub main'pmuludq{ &out2("pmuludq",@_); }
 225 sub main'psrlq  { &out2("psrlq",@_); }
 226 sub main'psllq  { &out2("psllq",@_); }
 227 sub main'pxor   { &out2("pxor",@_); }
 228 sub main'por    { &out2("por",@_); }
 229 sub main'pand   { &out2("pand",@_); }
 230
 231 # The bswapl instruction is new for the 486. Emulate if i386.
 232 sub main'bswap
 233         {
 234         if ($main'i386)
 235                 {
 236                 &main'comment("bswapl @_");
 237                 &main'exch(main'HB(@_),main'LB(@_));
 238                 &main'rotr(@_,16);
 239                 &main'exch(main'HB(@_),main'LB(@_));
 240                 }
 241         else
 242                 {
 243                 &out1("bswapl",@_);
 244                 }
 245         }
 246
 247 sub out2
 248         {
 249         local($name,$p1,$p2)=@_;
 250         local($l,$ll,$t);
 251         local(%special)=(       "roll",0xD1C0,"rorl",0xD1C8,
 252                                 "rcll",0xD1D0,"rcrl",0xD1D8,
 253                                 "shll",0xD1E0,"shrl",0xD1E8,
 254                                 "sarl",0xD1F8);
 255
 256         if ((defined($special{$name})) && defined($regs{$p1}) && ($p2 == 1))
 257                 {
 258                 $op=$special{$name}|$reg_val{$p1};
 259                 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
 260                 $tmp2=sprintf(".byte %d\t",$op     &0xff);
 261                 push(@out,$tmp1);
 262                 push(@out,$tmp2);
 263
 264                 $p2=&conv($p2);
 265                 $p1=&conv($p1);
 266                 &main'comment("$name $p2 $p1");
 267                 return;
 268                 }
 269
 270         push(@out,"\t$name\t");
 271         $t=&conv($p2).",";
 272         $l=length($t);
 273         push(@out,$t);
 274         $ll=4-($l+9)/8;
 275         $tmp1=sprintf("\t" x $ll);
 276         push(@out,$tmp1);
 277         push(@out,&conv($p1)."\n");
 278         }
 279
 280 sub out1
 281         {
 282         local($name,$p1)=@_;
 283         local($l,$t);
 284         local(%special)=("bswapl",0x0FC8);
 285
 286         if ((defined($special{$name})) && defined($regs{$p1}))
 287                 {
 288                 $op=$special{$name}|$reg_val{$p1};
 289                 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
 290                 $tmp2=sprintf(".byte %d\t",$op     &0xff);
 291                 push(@out,$tmp1);
 292                 push(@out,$tmp2);
 293
 294                 $p2=&conv($p2);
 295                 $p1=&conv($p1);
 296                 &main'comment("$name $p2 $p1");
 297                 return;
 298                 }
 299
 300         push(@out,"\t$name\t".&conv($p1)."\n");
 301         }
 302
 303 sub out1p
 304         {
 305         local($name,$p1)=@_;
 306         local($l,$t);
 307
 308         push(@out,"\t$name\t*".&conv($p1)."\n");
 309         }
 310
 311 sub out0
 312         {
 313         push(@out,"\t$_[0]\n");
 314         }
 315
 316 sub conv
 317         {
 318         local($p)=@_;
 319
 320 #       $p =~ s/0x([0-9A-Fa-f]+)/0$1h/;
 321
 322         $p=$regs{$p} if (defined($regs{$p}));
 323
 324         $p =~ s/^(-{0,1}[0-9A-Fa-f]+)$/\$$1/;
 325         $p =~ s/^(0x[0-9A-Fa-f]+)$/\$$1/;
 326         return $p;
 327         }
 328
 329 sub main'file
 330         {
 331         local($file)=@_;
 332
 333         local($tmp)=<<"EOF";
 334         .file   "$file.s"
 335 EOF
 336         push(@out,$tmp);
 337         }
 338
 339 sub main'function_begin
 340         {
 341         local($func)=@_;
 342
 343         &main'external_label($func);
 344         $func=$under.$func;
 345
 346         local($tmp)=<<"EOF";
 347 .text
 348 .globl  $func
 349 EOF
 350         push(@out,$tmp);
 351         if ($main'cpp)
 352                 { $tmp=push(@out,"TYPE($func,\@function)\n"); }
 353         elsif ($main'coff)
 354                 { $tmp=push(@out,".def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
 355         elsif ($main'aout and !$main'pic)
 356                 { }
 357         else    { $tmp=push(@out,".type\t$func,\@function\n"); }
 358         push(@out,".align\t$align\n");
 359         push(@out,"$func:\n");
 360         $tmp=<<"EOF";
 361         pushl   %ebp
 362         pushl   %ebx
 363         pushl   %esi
 364         pushl   %edi
 365
 366 EOF
 367         push(@out,$tmp);
 368         $stack=20;
 369         }
 370
 371 sub main'function_begin_B
 372         {
 373         local($func,$extra)=@_;
 374
 375         &main'external_label($func);
 376         $func=$under.$func;
 377
 378         local($tmp)=<<"EOF";
 379 .text
 380 .globl  $func
 381 EOF
 382         push(@out,$tmp);
 383         if ($main'cpp)
 384                 { push(@out,"TYPE($func,\@function)\n"); }
 385         elsif ($main'coff)
 386                 { $tmp=push(@out,".def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
 387         elsif ($main'aout and !$main'pic)
 388                 { }
 389         else    { push(@out,".type      $func,\@function\n"); }
 390         push(@out,".align\t$align\n");
 391         push(@out,"$func:\n");
 392         $stack=4;
 393         }
 394
 395 sub main'function_end
 396         {
 397         local($func)=@_;
 398
 399         $func=$under.$func;
 400
 401         local($tmp)=<<"EOF";
 402         popl    %edi
 403         popl    %esi
 404         popl    %ebx
 405         popl    %ebp
 406         ret
 407 ${dot}L_${func}_end:
 408 EOF
 409         push(@out,$tmp);
 410
 411         if ($main'cpp)
 412                 { push(@out,"SIZE($func,${dot}L_${func}_end-$func)\n"); }
 413         elsif ($main'coff or $main'aout)
 414                 { }
 415         else    { push(@out,".size\t$func,${dot}L_${func}_end-$func\n"); }
 416         push(@out,".ident       \"$func\"\n");
 417         $stack=0;
 418         %label=();
 419         }
 420
 421 sub main'function_end_A
 422         {
 423         local($func)=@_;
 424
 425         local($tmp)=<<"EOF";
 426         popl    %edi
 427         popl    %esi
 428         popl    %ebx
 429         popl    %ebp
 430         ret
 431 EOF
 432         push(@out,$tmp);
 433         }
 434
 435 sub main'function_end_B
 436         {
 437         local($func)=@_;
 438
 439         $func=$under.$func;
 440
 441         push(@out,"${dot}L_${func}_end:\n");
 442         if ($main'cpp)
 443                 { push(@out,"SIZE($func,${dot}L_${func}_end-$func)\n"); }
 444         elsif ($main'coff or $main'aout)
 445                 { }
 446         else    { push(@out,".size\t$func,${dot}L_${func}_end-$func\n"); }
 447         push(@out,".ident       \"$func\"\n");
 448         $stack=0;
 449         %label=();
 450         }
 451
 452 sub main'wparam
 453         {
 454         local($num)=@_;
 455
 456         return(&main'DWP($stack+$num*4,"esp","",0));
 457         }
 458
 459 sub main'stack_push
 460         {
 461         local($num)=@_;
 462         $stack+=$num*4;
 463         &main'sub("esp",$num*4);
 464         }
 465
 466 sub main'stack_pop
 467         {
 468         local($num)=@_;
 469         $stack-=$num*4;
 470         &main'add("esp",$num*4);
 471         }
 472
 473 sub main'swtmp
 474         {
 475         return(&main'DWP($_[0]*4,"esp","",0));
 476         }
 477
 478 # Should use swtmp, which is above esp.  Linix can trash the stack above esp
 479 #sub main'wtmp
 480 #       {
 481 #       local($num)=@_;
 482 #
 483 #       return(&main'DWP(-($num+1)*4,"esp","",0));
 484 #       }
 485
 486 sub main'comment
 487         {
 488         if (!defined($com_start) or $main'elf)
 489                 {       # Regarding $main'elf above...
 490                         # GNU and SVR4 as'es use different comment delimiters,
 491                 push(@out,"\n");        # so we just skip ELF comments...
 492                 return;
 493                 }
 494         foreach (@_)
 495                 {
 496                 if (/^\s*$/)
 497                         { push(@out,"\n"); }
 498                 else
 499                         { push(@out,"\t$com_start $_ $com_end\n"); }
 500                 }
 501         }
 502
 503 sub main'public_label
 504         {
 505         $label{$_[0]}="${under}${_[0]}" if (!defined($label{$_[0]}));
 506         push(@out,".globl\t$label{$_[0]}\n");
 507         }
 508
 509 sub main'label
 510         {
 511         if (!defined($label{$_[0]}))
 512                 {
 513                 $label{$_[0]}="${dot}${label}${_[0]}";
 514                 $label++;
 515                 }
 516         return($label{$_[0]});
 517         }
 518
 519 sub main'set_label
 520         {
 521         if (!defined($label{$_[0]}))
 522                 {
 523                 $label{$_[0]}="${dot}${label}${_[0]}";
 524                 $label++;
 525                 }
 526         if ($_[1]!=0)
 527                 {
 528                 if ($_[1]>1)    { main'align($_[1]);            }
 529                 else            { push(@out,".align $align\n"); }
 530                 }
 531         push(@out,"$label{$_[0]}:\n");
 532         }
 533
 534 sub main'file_end
 535         {
 536         # try to detect if SSE2 or MMX extensions were used on ELF platform...
 537         if ($main'elf && grep {/%[x]*mm[0-7]/i} @out) {
 538                 local($tmp);
 539
 540                 push (@out,"\n.section\t.bss\n");
 541                 push (@out,".comm\t${under}OPENSSL_ia32cap_P,4,4\n");
 542
 543                 push (@out,".section\t.init\n");
 544                 # One can argue that it's wasteful to craft every
 545                 # SSE/MMX module with this snippet... Well, it's 72
 546                 # bytes long and for the moment we have two modules.
 547                 # Let's argue when we have 7 modules or so...
 548                 #
 549                 # $1<<10 sets a reserved bit to signal that variable
 550                 # was initialized already...
 551                 &main'picmeup("edx","OPENSSL_ia32cap_P");
 552                 $tmp=<<___;
 553                 cmpl    \$0,(%edx)
 554                 jne     1f
 555                 movl    \$1<<10,(%edx)
 556                 pushf
 557                 popl    %eax
 558                 movl    %eax,%ecx
 559                 xorl    \$1<<21,%eax
 560                 pushl   %eax
 561                 popf
 562                 pushf
 563                 popl    %eax
 564                 xorl    %ecx,%eax
 565                 btl     \$21,%eax
 566                 jnc     1f
 567                 pushl   %edi
 568                 pushl   %ebx
 569                 movl    %edx,%edi
 570                 movl    \$1,%eax
 571                 .byte   0x0f,0xa2
 572                 orl     \$1<<10,%edx
 573                 movl    %edx,0(%edi)
 574                 popl    %ebx
 575                 popl    %edi
 576                 jmp     1f
 577         .align  $align
 578         1:
 579 ___
 580                 push (@out,$tmp);
 581         }
 582
 583         if ($const ne "")
 584                 {
 585                 push(@out,".section .rodata\n");
 586                 push(@out,$const);
 587                 $const="";
 588                 }
 589         }
 590
 591 sub main'data_word
 592         {
 593         push(@out,"\t.long\t".join(',',@_)."\n");
 594         }
 595
 596 sub main'align
 597         {
 598         my $val=$_[0],$p2,$i;
 599         if ($main'aout) {
 600                 for ($p2=0;$val!=0;$val>>=1) { $p2++; }
 601                 $val=$p2-1;
 602                 $val.=",0x90";
 603         }
 604         push(@out,".align\t$val\n");
 605         }
 606
 607 # debug output functions: puts, putx, printf
 608
 609 sub main'puts
 610         {
 611         &pushvars();
 612         &main'push('$Lstring' . ++$constl);
 613         &main'call('puts');
 614         $stack-=4;
 615         &main'add("esp",4);
 616         &popvars();
 617
 618         $const .= "Lstring$constl:\n\t.string \"@_[0]\"\n";
 619         }
 620
 621 sub main'putx
 622         {
 623         &pushvars();
 624         &main'push($_[0]);
 625         &main'push('$Lstring' . ++$constl);
 626         &main'call('printf');
 627         &main'add("esp",8);
 628         $stack-=8;
 629         &popvars();
 630
 631         $const .= "Lstring$constl:\n\t.string \"\%X\"\n";
 632         }
 633
 634 sub main'printf
 635         {
 636         $ostack = $stack;
 637         &pushvars();
 638         for ($i = @_ - 1; $i >= 0; $i--)
 639                 {
 640                 if ($i == 0) # change this to support %s format strings
 641                         {
 642                         &main'push('$Lstring' . ++$constl);
 643                         $const .= "Lstring$constl:\n\t.string \"@_[$i]\"\n";
 644                         }
 645                 else
 646                         {
 647                         if ($_[$i] =~ /([0-9]*)\(%esp\)/)
 648                                 {
 649                                 &main'push(($1 + $stack - $ostack) . '(%esp)');
 650                                 }
 651                         else
 652                                 {
 653                                 &main'push($_[$i]);
 654                                 }
 655                         }
 656                 }
 657         &main'call('printf');
 658         $stack-=4*@_;
 659         &main'add("esp",4*@_);
 660         &popvars();
 661         }
 662
 663 sub pushvars
 664         {
 665         &main'pushf();
 666         &main'push("edx");
 667         &main'push("ecx");
 668         &main'push("eax");
 669         }
 670
 671 sub popvars
 672         {
 673         &main'pop("eax");
 674         &main'pop("ecx");
 675         &main'pop("edx");
 676         &main'popf();
 677         }
 678
 679 sub main'picmeup
 680         {
 681         local($dst,$sym)=@_;
 682         if ($main'cpp)
 683                 {
 684                 local($tmp)=<<___;
 685 #if (defined(ELF) || defined(SOL)) && defined(PIC)
 686         call    1f
 687 1:      popl    $regs{$dst}
 688         addl    \$_GLOBAL_OFFSET_TABLE_+[.-1b],$regs{$dst}
 689         movl    $sym\@GOT($regs{$dst}),$regs{$dst}
 690 #else
 691         leal    $sym,$regs{$dst}
 692 #endif
 693 ___
 694                 push(@out,$tmp);
 695                 }
 696         elsif ($main'pic && ($main'elf || $main'aout))
 697                 {
 698                 &main'call(&main'label("PIC_me_up"));
 699                 &main'set_label("PIC_me_up");
 700                 &main'blindpop($dst);
 701                 &main'add($dst,"\$${under}_GLOBAL_OFFSET_TABLE_+[.-".
 702                                 &main'label("PIC_me_up") . "]");
 703                 &main'mov($dst,&main'DWP($under.$sym."\@GOT",$dst));
 704                 }
 705         else
 706                 {
 707                 &main'lea($dst,&main'DWP($sym));
 708                 }
 709         }
 710
 711 sub main'blindpop { &out1("popl",@_); }
 712
 713 sub main'initseg
 714         {
 715         local($f)=@_;
 716         local($tmp);
 717         if ($main'elf)
 718                 {
 719                 $tmp=<<___;
 720 .section        .init
 721         call    $under$f
 722         jmp     .Linitalign
 723 .align  $align
 724 .Linitalign:
 725 ___
 726                 }
 727         elsif ($main'coff)
 728                 {
 729                 $tmp=<<___;     # applies to both Cygwin and Mingw
 730 .section        .ctors
 731 .long   $under$f
 732 ___
 733                 }
 734         elsif ($main'aout)
 735                 {
 736                 local($ctor)="${under}_GLOBAL_\$I\$$f";
 737                 $tmp=".text\n";
 738                 $tmp.=".type    $ctor,\@function\n" if ($main'pic);
 739                 $tmp.=<<___;    # OpenBSD way...
 740 .globl  $ctor
 741 .align  2
 742 $ctor:
 743         jmp     $under$f
 744 ___
 745                 }
 746         push(@out,$tmp) if ($tmp);
 747         }
 748
 749 1;