1#!/usr/local/bin/perl 2 3package x86unix; 4 5$label="L000"; 6$const=""; 7$constl=0; 8 9$align=($main'aout)?"4":"16"; 10$under=($main'aout)?"_":""; 11$com_start=($main'sol)?"/":"#"; 12 13sub main'asm_init_output { @out=(); } 14sub main'asm_get_output { return(@out); } 15sub main'get_labels { return(@labels); } 16sub main'external_label { push(@labels,@_); } 17 18if ($main'cpp) 19 { 20 $align="ALIGN"; 21 $under=""; 22 $com_start='/*'; 23 $com_end='*/'; 24 } 25 26%lb=( 'eax', '%al', 27 'ebx', '%bl', 28 'ecx', '%cl', 29 'edx', '%dl', 30 'ax', '%al', 31 'bx', '%bl', 32 'cx', '%cl', 33 'dx', '%dl', 34 ); 35 36%hb=( 'eax', '%ah', 37 'ebx', '%bh', 38 'ecx', '%ch', 39 'edx', '%dh', 40 'ax', '%ah', 41 'bx', '%bh', 42 'cx', '%ch', 43 'dx', '%dh', 44 ); 45 46%regs=( 'eax', '%eax', 47 'ebx', '%ebx', 48 'ecx', '%ecx', 49 'edx', '%edx', 50 'esi', '%esi', 51 'edi', '%edi', 52 'ebp', '%ebp', 53 'esp', '%esp', 54 ); 55 56%reg_val=( 57 'eax', 0x00, 58 'ebx', 0x03, 59 'ecx', 0x01, 60 'edx', 0x02, 61 'esi', 0x06, 62 'edi', 0x07, 63 'ebp', 0x05, 64 'esp', 0x04, 65 ); 66 67sub main'LB 68 { 69 (defined($lb{$_[0]})) || die "$_[0] does not have a 'low byte'\n"; 70 return($lb{$_[0]}); 71 } 72 73sub main'HB 74 { 75 (defined($hb{$_[0]})) || die "$_[0] does not have a 'high byte'\n"; 76 return($hb{$_[0]}); 77 } 78 79sub main'DWP 80 { 81 local($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($ret); 98 } 99 100sub main'BP 101 { 102 return(&main'DWP(@_)); 103 } 104 105sub main'BC 106 { 107 return @_; 108 } 109 110sub main'DWC 111 { 112 return @_; 113 } 114 115#sub main'BP 116# { 117# local($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($ret); 130# } 131 132sub main'mov { &out2("movl",@_); } 133sub main'movb { &out2("movb",@_); } 134sub main'and { &out2("andl",@_); } 135sub main'or { &out2("orl",@_); } 136sub main'shl { &out2("sall",@_); } 137sub main'shr { &out2("shrl",@_); } 138sub main'xor { &out2("xorl",@_); } 139sub main'xorb { &out2("xorb",@_); } 140sub main'add { &out2($_[0]=~/%[a-d][lh]/?"addb":"addl",@_); } 141sub main'adc { &out2("adcl",@_); } 142sub main'sub { &out2("subl",@_); } 143sub main'rotl { &out2("roll",@_); } 144sub main'rotr { &out2("rorl",@_); } 145sub main'exch { &out2($_[0]=~/%[a-d][lh]/?"xchgb":"xchgl",@_); } 146sub main'cmp { &out2("cmpl",@_); } 147sub main'lea { &out2("leal",@_); } 148sub main'mul { &out1("mull",@_); } 149sub main'div { &out1("divl",@_); } 150sub main'jmp { &out1("jmp",@_); } 151sub main'jmp_ptr { &out1p("jmp",@_); } 152sub main'je { &out1("je",@_); } 153sub main'jle { &out1("jle",@_); } 154sub main'jne { &out1("jne",@_); } 155sub main'jnz { &out1("jnz",@_); } 156sub main'jz { &out1("jz",@_); } 157sub main'jge { &out1("jge",@_); } 158sub main'jl { &out1("jl",@_); } 159sub main'ja { &out1("ja",@_); } 160sub main'jae { &out1("jae",@_); } 161sub main'jb { &out1("jb",@_); } 162sub main'jbe { &out1("jbe",@_); } 163sub main'jc { &out1("jc",@_); } 164sub main'jnc { &out1("jnc",@_); } 165sub main'jno { &out1("jno",@_); } 166sub main'dec { &out1("decl",@_); } 167sub main'inc { &out1($_[0]=~/%[a-d][hl]/?"incb":"incl",@_); } 168sub main'push { &out1("pushl",@_); $stack+=4; } 169sub main'pop { &out1("popl",@_); $stack-=4; } 170sub main'pushf { &out0("pushf"); $stack+=4; } 171sub main'popf { &out0("popf"); $stack-=4; } 172sub main'not { &out1("notl",@_); } 173sub main'call { &out1("call",($_[0]=~/^\.L/?'':$under).$_[0]); } 174sub main'ret { &out0("ret"); } 175sub main'nop { &out0("nop"); } 176sub main'movz { &out2("movzbl",@_); } 177 178# The bswapl instruction is new for the 486. Emulate if i386. 179sub main'bswap 180 { 181 if ($main'i386) 182 { 183 &main'comment("bswapl @_"); 184 &main'exch(main'HB(@_),main'LB(@_)); 185 &main'rotr(@_,16); 186 &main'exch(main'HB(@_),main'LB(@_)); 187 } 188 else 189 { 190 &out1("bswapl",@_); 191 } 192 } 193 194sub out2 195 { 196 local($name,$p1,$p2)=@_; 197 local($l,$ll,$t); 198 local(%special)=( "roll",0xD1C0,"rorl",0xD1C8, 199 "rcll",0xD1D0,"rcrl",0xD1D8, 200 "shll",0xD1E0,"shrl",0xD1E8, 201 "sarl",0xD1F8); 202 203 if ((defined($special{$name})) && defined($regs{$p1}) && ($p2 == 1)) 204 { 205 $op=$special{$name}|$reg_val{$p1}; 206 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff); 207 $tmp2=sprintf(".byte %d\t",$op &0xff); 208 push(@out,$tmp1); 209 push(@out,$tmp2); 210 211 $p2=&conv($p2); 212 $p1=&conv($p1); 213 &main'comment("$name $p2 $p1"); 214 return; 215 } 216 217 push(@out,"\t$name\t"); 218 $t=&conv($p2).","; 219 $l=length($t); 220 push(@out,$t); 221 $ll=4-($l+9)/8; 222 $tmp1=sprintf("\t" x $ll); 223 push(@out,$tmp1); 224 push(@out,&conv($p1)."\n"); 225 } 226 227sub out1 228 { 229 local($name,$p1)=@_; 230 local($l,$t); 231 local(%special)=("bswapl",0x0FC8); 232 233 if ((defined($special{$name})) && defined($regs{$p1})) 234 { 235 $op=$special{$name}|$reg_val{$p1}; 236 $tmp1=sprintf(".byte %d\n",($op>>8)&0xff); 237 $tmp2=sprintf(".byte %d\t",$op &0xff); 238 push(@out,$tmp1); 239 push(@out,$tmp2); 240 241 $p2=&conv($p2); 242 $p1=&conv($p1); 243 &main'comment("$name $p2 $p1"); 244 return; 245 } 246 247 push(@out,"\t$name\t".&conv($p1)."\n"); 248 } 249 250sub out1p 251 { 252 local($name,$p1)=@_; 253 local($l,$t); 254 255 push(@out,"\t$name\t*".&conv($p1)."\n"); 256 } 257 258sub out0 259 { 260 push(@out,"\t$_[0]\n"); 261 } 262 263sub conv 264 { 265 local($p)=@_; 266 267# $p =~ s/0x([0-9A-Fa-f]+)/0$1h/; 268 269 $p=$regs{$p} if (defined($regs{$p})); 270 271 $p =~ s/^(-{0,1}[0-9A-Fa-f]+)$/\$$1/; 272 $p =~ s/^(0x[0-9A-Fa-f]+)$/\$$1/; 273 return $p; 274 } 275 276sub main'file 277 { 278 local($file)=@_; 279 280 local($tmp)=<<"EOF"; 281 .file "$file.s" 282 .version "01.01" 283gcc2_compiled.: 284EOF 285 push(@out,$tmp); 286 } 287 288sub main'function_begin 289 { 290 local($func)=@_; 291 292 &main'external_label($func); 293 $func=$under.$func; 294 295 local($tmp)=<<"EOF"; 296.text 297 .align $align 298.globl $func 299EOF 300 push(@out,$tmp); 301 if ($main'cpp) 302 { $tmp=push(@out,"\tTYPE($func,\@function)\n"); } 303 elsif ($main'gaswin) 304 { $tmp=push(@out,"\t.def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); } 305 else { $tmp=push(@out,"\t.type\t$func,\@function\n"); } 306 push(@out,"$func:\n"); 307 $tmp=<<"EOF"; 308 pushl %ebp 309 pushl %ebx 310 pushl %esi 311 pushl %edi 312 313EOF 314 push(@out,$tmp); 315 $stack=20; 316 } 317 318sub main'function_begin_B 319 { 320 local($func,$extra)=@_; 321 322 &main'external_label($func); 323 $func=$under.$func; 324 325 local($tmp)=<<"EOF"; 326.text 327 .align $align 328.globl $func 329EOF 330 push(@out,$tmp); 331 if ($main'cpp) 332 { push(@out,"\tTYPE($func,\@function)\n"); } 333 elsif ($main'gaswin) 334 { $tmp=push(@out,"\t.def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); } 335 else { push(@out,"\t.type $func,\@function\n"); } 336 push(@out,"$func:\n"); 337 $stack=4; 338 } 339 340sub main'function_end 341 { 342 local($func)=@_; 343 344 $func=$under.$func; 345 346 local($tmp)=<<"EOF"; 347 popl %edi 348 popl %esi 349 popl %ebx 350 popl %ebp 351 ret 352.L_${func}_end: 353EOF 354 push(@out,$tmp); 355 356 if ($main'cpp) 357 { push(@out,"\tSIZE($func,.L_${func}_end-$func)\n"); } 358 elsif ($main'gaswin) 359 { $tmp=push(@out,"\t.align 4\n"); } 360 else { push(@out,"\t.size\t$func,.L_${func}_end-$func\n"); } 361 push(@out,".ident \"$func\"\n"); 362 $stack=0; 363 %label=(); 364 } 365 366sub main'function_end_A 367 { 368 local($func)=@_; 369 370 local($tmp)=<<"EOF"; 371 popl %edi 372 popl %esi 373 popl %ebx 374 popl %ebp 375 ret 376EOF 377 push(@out,$tmp); 378 } 379 380sub main'function_end_B 381 { 382 local($func)=@_; 383 384 $func=$under.$func; 385 386 push(@out,".L_${func}_end:\n"); 387 if ($main'cpp) 388 { push(@out,"\tSIZE($func,.L_${func}_end-$func)\n"); } 389 elsif ($main'gaswin) 390 { push(@out,"\t.align 4\n"); } 391 else { push(@out,"\t.size\t$func,.L_${func}_end-$func\n"); } 392 push(@out,".ident \"desasm.pl\"\n"); 393 $stack=0; 394 %label=(); 395 } 396 397sub main'wparam 398 { 399 local($num)=@_; 400 401 return(&main'DWP($stack+$num*4,"esp","",0)); 402 } 403 404sub main'stack_push 405 { 406 local($num)=@_; 407 $stack+=$num*4; 408 &main'sub("esp",$num*4); 409 } 410 411sub main'stack_pop 412 { 413 local($num)=@_; 414 $stack-=$num*4; 415 &main'add("esp",$num*4); 416 } 417 418sub main'swtmp 419 { 420 return(&main'DWP($_[0]*4,"esp","",0)); 421 } 422 423# Should use swtmp, which is above esp. Linix can trash the stack above esp 424#sub main'wtmp 425# { 426# local($num)=@_; 427# 428# return(&main'DWP(-($num+1)*4,"esp","",0)); 429# } 430 431sub main'comment 432 { 433 if ($main'elf) # GNU and SVR4 as'es use different comment delimiters, 434 { # so we just skip comments... 435 push(@out,"\n"); 436 return; 437 } 438 foreach (@_) 439 { 440 if (/^\s*$/) 441 { push(@out,"\n"); } 442 else 443 { push(@out,"\t$com_start $_ $com_end\n"); } 444 } 445 } 446 447sub main'label 448 { 449 if (!defined($label{$_[0]})) 450 { 451 $label{$_[0]}=".${label}${_[0]}"; 452 $label++; 453 } 454 return($label{$_[0]}); 455 } 456 457sub main'set_label 458 { 459 if (!defined($label{$_[0]})) 460 { 461 $label{$_[0]}=".${label}${_[0]}"; 462 $label++; 463 } 464 push(@out,".align $align\n") if ($_[1] != 0); 465 push(@out,"$label{$_[0]}:\n"); 466 } 467 468sub main'file_end 469 { 470 if ($const ne "") 471 { 472 push(@out,".section .rodata\n"); 473 push(@out,$const); 474 $const=""; 475 } 476 } 477 478sub main'data_word 479 { 480 push(@out,"\t.long $_[0]\n"); 481 } 482 483# debug output functions: puts, putx, printf 484 485sub main'puts 486 { 487 &pushvars(); 488 &main'push('$Lstring' . ++$constl); 489 &main'call('puts'); 490 $stack-=4; 491 &main'add("esp",4); 492 &popvars(); 493 494 $const .= "Lstring$constl:\n\t.string \"@_[0]\"\n"; 495 } 496 497sub main'putx 498 { 499 &pushvars(); 500 &main'push($_[0]); 501 &main'push('$Lstring' . ++$constl); 502 &main'call('printf'); 503 &main'add("esp",8); 504 $stack-=8; 505 &popvars(); 506 507 $const .= "Lstring$constl:\n\t.string \"\%X\"\n"; 508 } 509 510sub main'printf 511 { 512 $ostack = $stack; 513 &pushvars(); 514 for ($i = @_ - 1; $i >= 0; $i--) 515 { 516 if ($i == 0) # change this to support %s format strings 517 { 518 &main'push('$Lstring' . ++$constl); 519 $const .= "Lstring$constl:\n\t.string \"@_[$i]\"\n"; 520 } 521 else 522 { 523 if ($_[$i] =~ /([0-9]*)\(%esp\)/) 524 { 525 &main'push(($1 + $stack - $ostack) . '(%esp)'); 526 } 527 else 528 { 529 &main'push($_[$i]); 530 } 531 } 532 } 533 &main'call('printf'); 534 $stack-=4*@_; 535 &main'add("esp",4*@_); 536 &popvars(); 537 } 538 539sub pushvars 540 { 541 &main'pushf(); 542 &main'push("edx"); 543 &main'push("ecx"); 544 &main'push("eax"); 545 } 546 547sub popvars 548 { 549 &main'pop("eax"); 550 &main'pop("ecx"); 551 &main'pop("edx"); 552 &main'popf(); 553 } 554 555sub main'picmeup 556 { 557 local($dst,$sym)=@_; 558 if ($main'cpp) 559 { 560 local($tmp)=<<___; 561#if (defined(ELF) || defined(SOL)) && defined(PIC) 562 .align 8 563 call 1f 5641: popl $regs{$dst} 565 addl \$_GLOBAL_OFFSET_TABLE_+[.-1b],$regs{$dst} 566 movl $sym\@GOT($regs{$dst}),$regs{$dst} 567#else 568 leal $sym,$regs{$dst} 569#endif 570___ 571 push(@out,$tmp); 572 } 573 elsif ($main'pic && ($main'elf || $main'aout)) 574 { 575 push(@out,"\t.align\t8\n"); 576 &main'call(&main'label("PIC_me_up")); 577 &main'set_label("PIC_me_up"); 578 &main'blindpop($dst); 579 &main'add($dst,"\$$under"."_GLOBAL_OFFSET_TABLE_+[.-". 580 &main'label("PIC_me_up") . "]"); 581 &main'mov($dst,&main'DWP($sym."\@GOT",$dst)); 582 } 583 else 584 { 585 &main'lea($dst,&main'DWP($sym)); 586 } 587 } 588 589sub main'blindpop { &out1("popl",@_); } 590