crypto/modes/asm/ghash-x86_64.pl

   1 #!/usr/bin/env perl
   2 #
   3 # ====================================================================
   4 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
   5 # project. The module is, however, dual licensed under OpenSSL and
   6 # CRYPTOGAMS licenses depending on where you obtain it. For further
   7 # details see http://www.openssl.org/~appro/cryptogams/.
   8 # ====================================================================
   9 #
  10 # March, June 2010
  11 #
  12 # The module implements "4-bit" GCM GHASH function and underlying
  13 # single multiplication operation in GF(2^128). "4-bit" means that
  14 # it uses 256 bytes per-key table [+128 bytes shared table]. GHASH
  15 # function features so called "528B" variant utilizing additional
  16 # 256+16 bytes of per-key storage [+512 bytes shared table].
  17 # Performance results are for this streamed GHASH subroutine and are
  18 # expressed in cycles per processed byte, less is better:
  19 #
  20 #               gcc 3.4.x(*)    assembler
  21 #
  22 # P4            28.6            14.0            +100%
  23 # Opteron       18.5            7.7             +140%
  24 # Core2         17.5            8.1(**)         +115%
  25 #
  26 # (*)   comparison is not completely fair, because C results are
  27 #       for vanilla "256B" implementation, not "528B";-)
  28 # (**)  it's mystery [to me] why Core2 result is not same as for
  29 #       Opteron;
  30
  31 # May 2010
  32 #
  33 # Add PCLMULQDQ version performing at 2.07 cycles per processed byte.
  34 # See ghash-x86.pl for background information and details about coding
  35 # techniques.
  36 #
  37 # Special thanks to David Woodhouse <dwmw2@infradead.org> for
  38 # providing access to a Westmere-based system on behalf of Intel
  39 # Open Source Technology Centre.
  40
  41 $flavour = shift;
  42 $output  = shift;
  43 if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
  44
  45 $win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
  46
  47 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  48 ( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
  49 ( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
  50 die "can't locate x86_64-xlate.pl";
  51
  52 open STDOUT,"| $^X $xlate $flavour $output";
  53
  54 # common register layout
  55 $nlo="%rax";
  56 $nhi="%rbx";
  57 $Zlo="%r8";
  58 $Zhi="%r9";
  59 $tmp="%r10";
  60 $rem_4bit = "%r11";
  61
  62 $Xi="%rdi";
  63 $Htbl="%rsi";
  64
  65 # per-function register layout
  66 $cnt="%rcx";
  67 $rem="%rdx";
  68
  69 sub LB() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/     or
  70                         $r =~ s/%[er]([sd]i)/%\1l/      or
  71                         $r =~ s/%[er](bp)/%\1l/         or
  72                         $r =~ s/%(r[0-9]+)[d]?/%\1b/;   $r; }
  73
  74 sub AUTOLOAD()          # thunk [simplified] 32-bit style perlasm
  75 { my $opcode = $AUTOLOAD; $opcode =~ s/.*:://;
  76   my $arg = pop;
  77     $arg = "\$$arg" if ($arg*1 eq $arg);
  78     $code .= "\t$opcode\t".join(',',$arg,reverse @_)."\n";
  79 }
  80 \f
  81 { my $N;
  82   sub loop() {
  83   my $inp = shift;
  84
  85         $N++;
  86 $code.=<<___;
  87         xor     $nlo,$nlo
  88         xor     $nhi,$nhi
  89         mov     `&LB("$Zlo")`,`&LB("$nlo")`
  90         mov     `&LB("$Zlo")`,`&LB("$nhi")`
  91         shl     \$4,`&LB("$nlo")`
  92         mov     \$14,$cnt
  93         mov     8($Htbl,$nlo),$Zlo
  94         mov     ($Htbl,$nlo),$Zhi
  95         and     \$0xf0,`&LB("$nhi")`
  96         mov     $Zlo,$rem
  97         jmp     .Loop$N
  98
  99 .align  16
 100 .Loop$N:
 101         shr     \$4,$Zlo
 102         and     \$0xf,$rem
 103         mov     $Zhi,$tmp
 104         mov     ($inp,$cnt),`&LB("$nlo")`
 105         shr     \$4,$Zhi
 106         xor     8($Htbl,$nhi),$Zlo
 107         shl     \$60,$tmp
 108         xor     ($Htbl,$nhi),$Zhi
 109         mov     `&LB("$nlo")`,`&LB("$nhi")`
 110         xor     ($rem_4bit,$rem,8),$Zhi
 111         mov     $Zlo,$rem
 112         shl     \$4,`&LB("$nlo")`
 113         xor     $tmp,$Zlo
 114         dec     $cnt
 115         js      .Lbreak$N
 116
 117         shr     \$4,$Zlo
 118         and     \$0xf,$rem
 119         mov     $Zhi,$tmp
 120         shr     \$4,$Zhi
 121         xor     8($Htbl,$nlo),$Zlo
 122         shl     \$60,$tmp
 123         xor     ($Htbl,$nlo),$Zhi
 124         and     \$0xf0,`&LB("$nhi")`
 125         xor     ($rem_4bit,$rem,8),$Zhi
 126         mov     $Zlo,$rem
 127         xor     $tmp,$Zlo
 128         jmp     .Loop$N
 129
 130 .align  16
 131 .Lbreak$N:
 132         shr     \$4,$Zlo
 133         and     \$0xf,$rem
 134         mov     $Zhi,$tmp
 135         shr     \$4,$Zhi
 136         xor     8($Htbl,$nlo),$Zlo
 137         shl     \$60,$tmp
 138         xor     ($Htbl,$nlo),$Zhi
 139         and     \$0xf0,`&LB("$nhi")`
 140         xor     ($rem_4bit,$rem,8),$Zhi
 141         mov     $Zlo,$rem
 142         xor     $tmp,$Zlo
 143
 144         shr     \$4,$Zlo
 145         and     \$0xf,$rem
 146         mov     $Zhi,$tmp
 147         shr     \$4,$Zhi
 148         xor     8($Htbl,$nhi),$Zlo
 149         shl     \$60,$tmp
 150         xor     ($Htbl,$nhi),$Zhi
 151         xor     $tmp,$Zlo
 152         xor     ($rem_4bit,$rem,8),$Zhi
 153
 154         bswap   $Zlo
 155         bswap   $Zhi
 156 ___
 157 }}
 158
 159 $code=<<___;
 160 .text
 161
 162 .globl  gcm_gmult_4bit
 163 .type   gcm_gmult_4bit,\@function,2
 164 .align  16
 165 gcm_gmult_4bit:
 166         push    %rbx
 167         push    %rbp            # %rbp and %r12 are pushed exclusively in
 168         push    %r12            # order to reuse Win64 exception handler...
 169 .Lgmult_prologue:
 170
 171         movzb   15($Xi),$Zlo
 172         lea     .Lrem_4bit(%rip),$rem_4bit
 173 ___
 174         &loop   ($Xi);
 175 $code.=<<___;
 176         mov     $Zlo,8($Xi)
 177         mov     $Zhi,($Xi)
 178
 179         mov     16(%rsp),%rbx
 180         lea     24(%rsp),%rsp
 181 .Lgmult_epilogue:
 182         ret
 183 .size   gcm_gmult_4bit,.-gcm_gmult_4bit
 184 ___
 185 \f
 186 # per-function register layout
 187 $inp="%rdx";
 188 $len="%rcx";
 189 $rem_8bit=$rem_4bit;
 190
 191 $code.=<<___;
 192 .globl  gcm_ghash_4bit
 193 .type   gcm_ghash_4bit,\@function,4
 194 .align  16
 195 gcm_ghash_4bit:
 196         push    %rbx
 197         push    %rbp
 198         push    %r12
 199         push    %r13
 200         push    %r14
 201         push    %r15
 202         sub     \$280,%rsp
 203 .Lghash_prologue:
 204         mov     $inp,%r14               # reassign couple of args
 205         mov     $len,%r15
 206 ___
 207 { my $inp="%r14";
 208   my $dat="%edx";
 209   my $len="%r15";
 210   my @nhi=("%ebx","%ecx");
 211   my @rem=("%r12","%r13");
 212   my $Hshr4="%rbp";
 213
 214         &sub    ($Htbl,-128);           # size optimization
 215         &lea    ($Hshr4,"16+128(%rsp)");
 216         { my @lo =($nlo,$nhi);
 217           my @hi =($Zlo,$Zhi);
 218
 219           &xor  ($dat,$dat);
 220           for ($i=0,$j=-2;$i<18;$i++,$j++) {
 221             &mov        ("$j(%rsp)",&LB($dat))          if ($i>1);
 222             &or         ($lo[0],$tmp)                   if ($i>1);
 223             &mov        (&LB($dat),&LB($lo[1]))         if ($i>0 && $i<17);
 224             &shr        ($lo[1],4)                      if ($i>0 && $i<17);
 225             &mov        ($tmp,$hi[1])                   if ($i>0 && $i<17);
 226             &shr        ($hi[1],4)                      if ($i>0 && $i<17);
 227             &mov        ("8*$j($Hshr4)",$hi[0])         if ($i>1);
 228             &mov        ($hi[0],"16*$i+0-128($Htbl)")   if ($i<16);
 229             &shl        (&LB($dat),4)                   if ($i>0 && $i<17);
 230             &mov        ("8*$j-128($Hshr4)",$lo[0])     if ($i>1);
 231             &mov        ($lo[0],"16*$i+8-128($Htbl)")   if ($i<16);
 232             &shl        ($tmp,60)                       if ($i>0 && $i<17);
 233
 234             push        (@lo,shift(@lo));
 235             push        (@hi,shift(@hi));
 236           }
 237         }
 238         &add    ($Htbl,-128);
 239         &mov    ($Zlo,"8($Xi)");
 240         &mov    ($Zhi,"0($Xi)");
 241         &add    ($len,$inp);            # pointer to the end of data
 242         &lea    ($rem_8bit,".Lrem_8bit(%rip)");
 243         &jmp    (".Louter_loop");
 244
 245 $code.=".align  16\n.Louter_loop:\n";
 246         &xor    ($Zhi,"($inp)");
 247         &mov    ("%rdx","8($inp)");
 248         &lea    ($inp,"16($inp)");
 249         &xor    ("%rdx",$Zlo);
 250         &mov    ("($Xi)",$Zhi);
 251         &mov    ("8($Xi)","%rdx");
 252         &shr    ("%rdx",32);
 253
 254         &xor    ($nlo,$nlo);
 255         &rol    ($dat,8);
 256         &mov    (&LB($nlo),&LB($dat));
 257         &movz   ($nhi[0],&LB($dat));
 258         &shl    (&LB($nlo),4);
 259         &shr    ($nhi[0],4);
 260
 261         for ($j=11,$i=0;$i<15;$i++) {
 262             &rol        ($dat,8);
 263             &xor        ($Zlo,"8($Htbl,$nlo)")                  if ($i>0);
 264             &xor        ($Zhi,"($Htbl,$nlo)")                   if ($i>0);
 265             &mov        ($Zlo,"8($Htbl,$nlo)")                  if ($i==0);
 266             &mov        ($Zhi,"($Htbl,$nlo)")                   if ($i==0);
 267
 268             &mov        (&LB($nlo),&LB($dat));
 269             &xor        ($Zlo,$tmp)                             if ($i>0);
 270             &movzw      ($rem[1],"($rem_8bit,$rem[1],2)")       if ($i>0);
 271
 272             &movz       ($nhi[1],&LB($dat));
 273             &shl        (&LB($nlo),4);
 274             &movzb      ($rem[0],"(%rsp,$nhi[0])");
 275
 276             &shr        ($nhi[1],4)                             if ($i<14);
 277             &and        ($nhi[1],0xf0)                          if ($i==14);
 278             &shl        ($rem[1],48)                            if ($i>0);
 279             &xor        ($rem[0],$Zlo);
 280
 281             &mov        ($tmp,$Zhi);
 282             &xor        ($Zhi,$rem[1])                          if ($i>0);
 283             &shr        ($Zlo,8);
 284
 285             &movz       ($rem[0],&LB($rem[0]));
 286             &mov        ($dat,"$j($Xi)")                        if (--$j%4==0);
 287             &shr        ($Zhi,8);
 288
 289             &xor        ($Zlo,"-128($Hshr4,$nhi[0],8)");
 290             &shl        ($tmp,56);
 291             &xor        ($Zhi,"($Hshr4,$nhi[0],8)");
 292
 293             unshift     (@nhi,pop(@nhi));               # "rotate" registers
 294             unshift     (@rem,pop(@rem));
 295         }
 296         &movzw  ($rem[1],"($rem_8bit,$rem[1],2)");
 297         &xor    ($Zlo,"8($Htbl,$nlo)");
 298         &xor    ($Zhi,"($Htbl,$nlo)");
 299
 300         &shl    ($rem[1],48);
 301         &xor    ($Zlo,$tmp);
 302
 303         &xor    ($Zhi,$rem[1]);
 304         &movz   ($rem[0],&LB($Zlo));
 305         &shr    ($Zlo,4);
 306
 307         &mov    ($tmp,$Zhi);
 308         &shl    (&LB($rem[0]),4);
 309         &shr    ($Zhi,4);
 310
 311         &xor    ($Zlo,"8($Htbl,$nhi[0])");
 312         &movzw  ($rem[0],"($rem_8bit,$rem[0],2)");
 313         &shl    ($tmp,60);
 314
 315         &xor    ($Zhi,"($Htbl,$nhi[0])");
 316         &xor    ($Zlo,$tmp);
 317         &shl    ($rem[0],48);
 318
 319         &bswap  ($Zlo);
 320         &xor    ($Zhi,$rem[0]);
 321
 322         &bswap  ($Zhi);
 323         &cmp    ($inp,$len);
 324         &jb     (".Louter_loop");
 325 }
 326 $code.=<<___;
 327         mov     $Zlo,8($Xi)
 328         mov     $Zhi,($Xi)
 329
 330         lea     280(%rsp),%rsi
 331         mov     0(%rsi),%r15
 332         mov     8(%rsi),%r14
 333         mov     16(%rsi),%r13
 334         mov     24(%rsi),%r12
 335         mov     32(%rsi),%rbp
 336         mov     40(%rsi),%rbx
 337         lea     48(%rsi),%rsp
 338 .Lghash_epilogue:
 339         ret
 340 .size   gcm_ghash_4bit,.-gcm_ghash_4bit
 341 ___
 342 \f
 343 ######################################################################
 344 # PCLMULQDQ version.
 345
 346 @_4args=$win64? ("%rcx","%rdx","%r8", "%r9") :  # Win64 order
 347                 ("%rdi","%rsi","%rdx","%rcx");  # Unix order
 348
 349 ($Xi,$Xhi)=("%xmm0","%xmm1");   $Hkey="%xmm2";
 350 ($T1,$T2,$T3)=("%xmm3","%xmm4","%xmm5");
 351
 352 sub clmul64x64_T2 {     # minimal register pressure
 353 my ($Xhi,$Xi,$Hkey,$modulo)=@_;
 354
 355 $code.=<<___ if (!defined($modulo));
 356         movdqa          $Xi,$Xhi                #
 357         pshufd          \$0b01001110,$Xi,$T1
 358         pshufd          \$0b01001110,$Hkey,$T2
 359         pxor            $Xi,$T1                 #
 360         pxor            $Hkey,$T2
 361 ___
 362 $code.=<<___;
 363         pclmulqdq       \$0x00,$Hkey,$Xi        #######
 364         pclmulqdq       \$0x11,$Hkey,$Xhi       #######
 365         pclmulqdq       \$0x00,$T2,$T1          #######
 366         pxor            $Xi,$T1                 #
 367         pxor            $Xhi,$T1                #
 368
 369         movdqa          $T1,$T2                 #
 370         psrldq          \$8,$T1
 371         pslldq          \$8,$T2                 #
 372         pxor            $T1,$Xhi
 373         pxor            $T2,$Xi                 #
 374 ___
 375 }
 376
 377 sub reduction_alg9 {    # 17/13 times faster than Intel version
 378 my ($Xhi,$Xi) = @_;
 379
 380 $code.=<<___;
 381         # 1st phase
 382         movdqa          $Xi,$T1                 #
 383         psllq           \$1,$Xi
 384         pxor            $T1,$Xi                 #
 385         psllq           \$5,$Xi                 #
 386         pxor            $T1,$Xi                 #
 387         psllq           \$57,$Xi                #
 388         movdqa          $Xi,$T2                 #
 389         pslldq          \$8,$Xi
 390         psrldq          \$8,$T2                 #
 391         pxor            $T1,$Xi
 392         pxor            $T2,$Xhi                #
 393
 394         # 2nd phase
 395         movdqa          $Xi,$T2
 396         psrlq           \$5,$Xi
 397         pxor            $T2,$Xi                 #
 398         psrlq           \$1,$Xi                 #
 399         pxor            $T2,$Xi                 #
 400         pxor            $Xhi,$T2
 401         psrlq           \$1,$Xi                 #
 402         pxor            $T2,$Xi                 #
 403 ___
 404 }
 405 \f
 406 { my ($Htbl,$Xip)=@_4args;
 407
 408 $code.=<<___;
 409 .globl  gcm_init_clmul
 410 .type   gcm_init_clmul,\@abi-omnipotent
 411 .align  16
 412 gcm_init_clmul:
 413         movdqu          ($Xip),$Hkey
 414         pshufd          \$0b01001110,$Hkey,$Hkey        # dword swap
 415
 416         # <<1 twist
 417         pshufd          \$0b11111111,$Hkey,$T2  # broadcast uppermost dword
 418         movdqa          $Hkey,$T1
 419         psllq           \$1,$Hkey
 420         pxor            $T3,$T3                 #
 421         psrlq           \$63,$T1
 422         pcmpgtd         $T2,$T3                 # broadcast carry bit
 423         pslldq          \$8,$T1
 424         por             $T1,$Hkey               # H<<=1
 425
 426         # magic reduction
 427         pand            .L0x1c2_polynomial(%rip),$T3
 428         pxor            $T3,$Hkey               # if(carry) H^=0x1c2_polynomial
 429
 430         # calculate H^2
 431         movdqa          $Hkey,$Xi
 432 ___
 433         &clmul64x64_T2  ($Xhi,$Xi,$Hkey);
 434         &reduction_alg9 ($Xhi,$Xi);
 435 $code.=<<___;
 436         movdqu          $Hkey,($Htbl)           # save H
 437         movdqu          $Xi,16($Htbl)           # save H^2
 438         ret
 439 .size   gcm_init_clmul,.-gcm_init_clmul
 440 ___
 441 }
 442
 443 { my ($Xip,$Htbl)=@_4args;
 444
 445 $code.=<<___;
 446 .globl  gcm_gmult_clmul
 447 .type   gcm_gmult_clmul,\@abi-omnipotent
 448 .align  16
 449 gcm_gmult_clmul:
 450         movdqu          ($Xip),$Xi
 451         movdqa          .Lbswap_mask(%rip),$T3
 452         movdqu          ($Htbl),$Hkey
 453         pshufb          $T3,$Xi
 454 ___
 455         &clmul64x64_T2  ($Xhi,$Xi,$Hkey);
 456         &reduction_alg9 ($Xhi,$Xi);
 457 $code.=<<___;
 458         pshufb          $T3,$Xi
 459         movdqu          $Xi,($Xip)
 460         ret
 461 .size   gcm_gmult_clmul,.-gcm_gmult_clmul
 462 ___
 463 }
 464 \f
 465 { my ($Xip,$Htbl,$inp,$len)=@_4args;
 466   my $Xn="%xmm6";
 467   my $Xhn="%xmm7";
 468   my $Hkey2="%xmm8";
 469   my $T1n="%xmm9";
 470   my $T2n="%xmm10";
 471
 472 $code.=<<___;
 473 .globl  gcm_ghash_clmul
 474 .type   gcm_ghash_clmul,\@abi-omnipotent
 475 .align  16
 476 gcm_ghash_clmul:
 477 ___
 478 $code.=<<___ if ($win64);
 479 .LSEH_begin_gcm_ghash_clmul:
 480         # I can't trust assembler to use specific encoding:-(
 481         .byte   0x48,0x83,0xec,0x58             #sub    \$0x58,%rsp
 482         .byte   0x0f,0x29,0x34,0x24             #movaps %xmm6,(%rsp)
 483         .byte   0x0f,0x29,0x7c,0x24,0x10        #movdqa %xmm7,0x10(%rsp)
 484         .byte   0x44,0x0f,0x29,0x44,0x24,0x20   #movaps %xmm8,0x20(%rsp)
 485         .byte   0x44,0x0f,0x29,0x4c,0x24,0x30   #movaps %xmm9,0x30(%rsp)
 486         .byte   0x44,0x0f,0x29,0x54,0x24,0x40   #movaps %xmm10,0x40(%rsp)
 487 ___
 488 $code.=<<___;
 489         movdqa          .Lbswap_mask(%rip),$T3
 490
 491         movdqu          ($Xip),$Xi
 492         movdqu          ($Htbl),$Hkey
 493         pshufb          $T3,$Xi
 494
 495         sub             \$0x10,$len
 496         jz              .Lodd_tail
 497
 498         movdqu          16($Htbl),$Hkey2
 499         #######
 500         # Xi+2 =[H*(Ii+1 + Xi+1)] mod P =
 501         #       [(H*Ii+1) + (H*Xi+1)] mod P =
 502         #       [(H*Ii+1) + H^2*(Ii+Xi)] mod P
 503         #
 504         movdqu          ($inp),$T1              # Ii
 505         movdqu          16($inp),$Xn            # Ii+1
 506         pshufb          $T3,$T1
 507         pshufb          $T3,$Xn
 508         pxor            $T1,$Xi                 # Ii+Xi
 509 ___
 510         &clmul64x64_T2  ($Xhn,$Xn,$Hkey);       # H*Ii+1
 511 $code.=<<___;
 512         movdqa          $Xi,$Xhi                #
 513         pshufd          \$0b01001110,$Xi,$T1
 514         pshufd          \$0b01001110,$Hkey2,$T2
 515         pxor            $Xi,$T1                 #
 516         pxor            $Hkey2,$T2
 517
 518         lea             32($inp),$inp           # i+=2
 519         sub             \$0x20,$len
 520         jbe             .Leven_tail
 521
 522 .Lmod_loop:
 523 ___
 524         &clmul64x64_T2  ($Xhi,$Xi,$Hkey2,1);    # H^2*(Ii+Xi)
 525 $code.=<<___;
 526         movdqu          ($inp),$T1              # Ii
 527         pxor            $Xn,$Xi                 # (H*Ii+1) + H^2*(Ii+Xi)
 528         pxor            $Xhn,$Xhi
 529
 530         movdqu          16($inp),$Xn            # Ii+1
 531         pshufb          $T3,$T1
 532         pshufb          $T3,$Xn
 533
 534         movdqa          $Xn,$Xhn                #
 535         pshufd          \$0b01001110,$Xn,$T1n
 536         pshufd          \$0b01001110,$Hkey,$T2n
 537         pxor            $Xn,$T1n                #
 538         pxor            $Hkey,$T2n
 539          pxor           $T1,$Xhi                # "Ii+Xi", consume early
 540
 541           movdqa        $Xi,$T1                 # 1st phase
 542           psllq         \$1,$Xi
 543           pxor          $T1,$Xi                 #
 544           psllq         \$5,$Xi                 #
 545           pxor          $T1,$Xi                 #
 546         pclmulqdq       \$0x00,$Hkey,$Xn        #######
 547           psllq         \$57,$Xi                #
 548           movdqa        $Xi,$T2                 #
 549           pslldq        \$8,$Xi
 550           psrldq        \$8,$T2                 #
 551           pxor          $T1,$Xi
 552           pxor          $T2,$Xhi                #
 553
 554         pclmulqdq       \$0x11,$Hkey,$Xhn       #######
 555           movdqa        $Xi,$T2                 # 2nd phase
 556           psrlq         \$5,$Xi
 557           pxor          $T2,$Xi                 #
 558           psrlq         \$1,$Xi                 #
 559           pxor          $T2,$Xi                 #
 560           pxor          $Xhi,$T2
 561           psrlq         \$1,$Xi                 #
 562           pxor          $T2,$Xi                 #
 563
 564         pclmulqdq       \$0x00,$T2n,$T1n        #######
 565          movdqa         $Xi,$Xhi                #
 566          pshufd         \$0b01001110,$Xi,$T1
 567          pshufd         \$0b01001110,$Hkey2,$T2
 568          pxor           $Xi,$T1                 #
 569          pxor           $Hkey2,$T2
 570
 571         pxor            $Xn,$T1n                #
 572         pxor            $Xhn,$T1n               #
 573         movdqa          $T1n,$T2n               #
 574         psrldq          \$8,$T1n
 575         pslldq          \$8,$T2n                #
 576         pxor            $T1n,$Xhn
 577         pxor            $T2n,$Xn                #
 578
 579         lea             32($inp),$inp
 580         sub             \$0x20,$len
 581         ja              .Lmod_loop
 582
 583 .Leven_tail:
 584 ___
 585         &clmul64x64_T2  ($Xhi,$Xi,$Hkey2,1);    # H^2*(Ii+Xi)
 586 $code.=<<___;
 587         pxor            $Xn,$Xi                 # (H*Ii+1) + H^2*(Ii+Xi)
 588         pxor            $Xhn,$Xhi
 589 ___
 590         &reduction_alg9 ($Xhi,$Xi);
 591 $code.=<<___;
 592         test            $len,$len
 593         jnz             .Ldone
 594
 595 .Lodd_tail:
 596         movdqu          ($inp),$T1              # Ii
 597         pshufb          $T3,$T1
 598         pxor            $T1,$Xi                 # Ii+Xi
 599 ___
 600         &clmul64x64_T2  ($Xhi,$Xi,$Hkey);       # H*(Ii+Xi)
 601         &reduction_alg9 ($Xhi,$Xi);
 602 $code.=<<___;
 603 .Ldone:
 604         pshufb          $T3,$Xi
 605         movdqu          $Xi,($Xip)
 606 ___
 607 $code.=<<___ if ($win64);
 608         movaps  (%rsp),%xmm6
 609         movaps  0x10(%rsp),%xmm7
 610         movaps  0x20(%rsp),%xmm8
 611         movaps  0x30(%rsp),%xmm9
 612         movaps  0x40(%rsp),%xmm10
 613         add     \$0x58,%rsp
 614 ___
 615 $code.=<<___;
 616         ret
 617 .LSEH_end_gcm_ghash_clmul:
 618 .size   gcm_ghash_clmul,.-gcm_ghash_clmul
 619 ___
 620 }
 621
 622 $code.=<<___;
 623 .align  64
 624 .Lbswap_mask:
 625         .byte   15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0
 626 .L0x1c2_polynomial:
 627         .byte   1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xc2
 628 .align  64
 629 .type   .Lrem_4bit,\@object
 630 .Lrem_4bit:
 631         .long   0,`0x0000<<16`,0,`0x1C20<<16`,0,`0x3840<<16`,0,`0x2460<<16`
 632         .long   0,`0x7080<<16`,0,`0x6CA0<<16`,0,`0x48C0<<16`,0,`0x54E0<<16`
 633         .long   0,`0xE100<<16`,0,`0xFD20<<16`,0,`0xD940<<16`,0,`0xC560<<16`
 634         .long   0,`0x9180<<16`,0,`0x8DA0<<16`,0,`0xA9C0<<16`,0,`0xB5E0<<16`
 635 .type   .Lrem_8bit,\@object
 636 .Lrem_8bit:
 637         .value  0x0000,0x01C2,0x0384,0x0246,0x0708,0x06CA,0x048C,0x054E
 638         .value  0x0E10,0x0FD2,0x0D94,0x0C56,0x0918,0x08DA,0x0A9C,0x0B5E
 639         .value  0x1C20,0x1DE2,0x1FA4,0x1E66,0x1B28,0x1AEA,0x18AC,0x196E
 640         .value  0x1230,0x13F2,0x11B4,0x1076,0x1538,0x14FA,0x16BC,0x177E
 641         .value  0x3840,0x3982,0x3BC4,0x3A06,0x3F48,0x3E8A,0x3CCC,0x3D0E
 642         .value  0x3650,0x3792,0x35D4,0x3416,0x3158,0x309A,0x32DC,0x331E
 643         .value  0x2460,0x25A2,0x27E4,0x2626,0x2368,0x22AA,0x20EC,0x212E
 644         .value  0x2A70,0x2BB2,0x29F4,0x2836,0x2D78,0x2CBA,0x2EFC,0x2F3E
 645         .value  0x7080,0x7142,0x7304,0x72C6,0x7788,0x764A,0x740C,0x75CE
 646         .value  0x7E90,0x7F52,0x7D14,0x7CD6,0x7998,0x785A,0x7A1C,0x7BDE
 647         .value  0x6CA0,0x6D62,0x6F24,0x6EE6,0x6BA8,0x6A6A,0x682C,0x69EE
 648         .value  0x62B0,0x6372,0x6134,0x60F6,0x65B8,0x647A,0x663C,0x67FE
 649         .value  0x48C0,0x4902,0x4B44,0x4A86,0x4FC8,0x4E0A,0x4C4C,0x4D8E
 650         .value  0x46D0,0x4712,0x4554,0x4496,0x41D8,0x401A,0x425C,0x439E
 651         .value  0x54E0,0x5522,0x5764,0x56A6,0x53E8,0x522A,0x506C,0x51AE
 652         .value  0x5AF0,0x5B32,0x5974,0x58B6,0x5DF8,0x5C3A,0x5E7C,0x5FBE
 653         .value  0xE100,0xE0C2,0xE284,0xE346,0xE608,0xE7CA,0xE58C,0xE44E
 654         .value  0xEF10,0xEED2,0xEC94,0xED56,0xE818,0xE9DA,0xEB9C,0xEA5E
 655         .value  0xFD20,0xFCE2,0xFEA4,0xFF66,0xFA28,0xFBEA,0xF9AC,0xF86E
 656         .value  0xF330,0xF2F2,0xF0B4,0xF176,0xF438,0xF5FA,0xF7BC,0xF67E
 657         .value  0xD940,0xD882,0xDAC4,0xDB06,0xDE48,0xDF8A,0xDDCC,0xDC0E
 658         .value  0xD750,0xD692,0xD4D4,0xD516,0xD058,0xD19A,0xD3DC,0xD21E
 659         .value  0xC560,0xC4A2,0xC6E4,0xC726,0xC268,0xC3AA,0xC1EC,0xC02E
 660         .value  0xCB70,0xCAB2,0xC8F4,0xC936,0xCC78,0xCDBA,0xCFFC,0xCE3E
 661         .value  0x9180,0x9042,0x9204,0x93C6,0x9688,0x974A,0x950C,0x94CE
 662         .value  0x9F90,0x9E52,0x9C14,0x9DD6,0x9898,0x995A,0x9B1C,0x9ADE
 663         .value  0x8DA0,0x8C62,0x8E24,0x8FE6,0x8AA8,0x8B6A,0x892C,0x88EE
 664         .value  0x83B0,0x8272,0x8034,0x81F6,0x84B8,0x857A,0x873C,0x86FE
 665         .value  0xA9C0,0xA802,0xAA44,0xAB86,0xAEC8,0xAF0A,0xAD4C,0xAC8E
 666         .value  0xA7D0,0xA612,0xA454,0xA596,0xA0D8,0xA11A,0xA35C,0xA29E
 667         .value  0xB5E0,0xB422,0xB664,0xB7A6,0xB2E8,0xB32A,0xB16C,0xB0AE
 668         .value  0xBBF0,0xBA32,0xB874,0xB9B6,0xBCF8,0xBD3A,0xBF7C,0xBEBE
 669
 670 .asciz  "GHASH for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
 671 .align  64
 672 ___
 673 \f
 674 # EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
 675 #               CONTEXT *context,DISPATCHER_CONTEXT *disp)
 676 if ($win64) {
 677 $rec="%rcx";
 678 $frame="%rdx";
 679 $context="%r8";
 680 $disp="%r9";
 681
 682 $code.=<<___;
 683 .extern __imp_RtlVirtualUnwind
 684 .type   se_handler,\@abi-omnipotent
 685 .align  16
 686 se_handler:
 687         push    %rsi
 688         push    %rdi
 689         push    %rbx
 690         push    %rbp
 691         push    %r12
 692         push    %r13
 693         push    %r14
 694         push    %r15
 695         pushfq
 696         sub     \$64,%rsp
 697
 698         mov     120($context),%rax      # pull context->Rax
 699         mov     248($context),%rbx      # pull context->Rip
 700
 701         mov     8($disp),%rsi           # disp->ImageBase
 702         mov     56($disp),%r11          # disp->HandlerData
 703
 704         mov     0(%r11),%r10d           # HandlerData[0]
 705         lea     (%rsi,%r10),%r10        # prologue label
 706         cmp     %r10,%rbx               # context->Rip<prologue label
 707         jb      .Lin_prologue
 708
 709         mov     152($context),%rax      # pull context->Rsp
 710
 711         mov     4(%r11),%r10d           # HandlerData[1]
 712         lea     (%rsi,%r10),%r10        # epilogue label
 713         cmp     %r10,%rbx               # context->Rip>=epilogue label
 714         jae     .Lin_prologue
 715
 716         lea     24(%rax),%rax           # adjust "rsp"
 717
 718         mov     -8(%rax),%rbx
 719         mov     -16(%rax),%rbp
 720         mov     -24(%rax),%r12
 721         mov     %rbx,144($context)      # restore context->Rbx
 722         mov     %rbp,160($context)      # restore context->Rbp
 723         mov     %r12,216($context)      # restore context->R12
 724
 725 .Lin_prologue:
 726         mov     8(%rax),%rdi
 727         mov     16(%rax),%rsi
 728         mov     %rax,152($context)      # restore context->Rsp
 729         mov     %rsi,168($context)      # restore context->Rsi
 730         mov     %rdi,176($context)      # restore context->Rdi
 731
 732         mov     40($disp),%rdi          # disp->ContextRecord
 733         mov     $context,%rsi           # context
 734         mov     \$`1232/8`,%ecx         # sizeof(CONTEXT)
 735         .long   0xa548f3fc              # cld; rep movsq
 736
 737         mov     $disp,%rsi
 738         xor     %rcx,%rcx               # arg1, UNW_FLAG_NHANDLER
 739         mov     8(%rsi),%rdx            # arg2, disp->ImageBase
 740         mov     0(%rsi),%r8             # arg3, disp->ControlPc
 741         mov     16(%rsi),%r9            # arg4, disp->FunctionEntry
 742         mov     40(%rsi),%r10           # disp->ContextRecord
 743         lea     56(%rsi),%r11           # &disp->HandlerData
 744         lea     24(%rsi),%r12           # &disp->EstablisherFrame
 745         mov     %r10,32(%rsp)           # arg5
 746         mov     %r11,40(%rsp)           # arg6
 747         mov     %r12,48(%rsp)           # arg7
 748         mov     %rcx,56(%rsp)           # arg8, (NULL)
 749         call    *__imp_RtlVirtualUnwind(%rip)
 750
 751         mov     \$1,%eax                # ExceptionContinueSearch
 752         add     \$64,%rsp
 753         popfq
 754         pop     %r15
 755         pop     %r14
 756         pop     %r13
 757         pop     %r12
 758         pop     %rbp
 759         pop     %rbx
 760         pop     %rdi
 761         pop     %rsi
 762         ret
 763 .size   se_handler,.-se_handler
 764
 765 .section        .pdata
 766 .align  4
 767         .rva    .LSEH_begin_gcm_gmult_4bit
 768         .rva    .LSEH_end_gcm_gmult_4bit
 769         .rva    .LSEH_info_gcm_gmult_4bit
 770
 771         .rva    .LSEH_begin_gcm_ghash_4bit
 772         .rva    .LSEH_end_gcm_ghash_4bit
 773         .rva    .LSEH_info_gcm_ghash_4bit
 774
 775         .rva    .LSEH_begin_gcm_ghash_clmul
 776         .rva    .LSEH_end_gcm_ghash_clmul
 777         .rva    .LSEH_info_gcm_ghash_clmul
 778
 779 .section        .xdata
 780 .align  8
 781 .LSEH_info_gcm_gmult_4bit:
 782         .byte   9,0,0,0
 783         .rva    se_handler
 784         .rva    .Lgmult_prologue,.Lgmult_epilogue       # HandlerData
 785 .LSEH_info_gcm_ghash_4bit:
 786         .byte   9,0,0,0
 787         .rva    se_handler
 788         .rva    .Lghash_prologue,.Lghash_epilogue       # HandlerData
 789 .LSEH_info_gcm_ghash_clmul:
 790         .byte   0x01,0x1f,0x0b,0x00
 791         .byte   0x1f,0xa8,0x04,0x00     #movaps 0x40(rsp),xmm10
 792         .byte   0x19,0x98,0x03,0x00     #movaps 0x30(rsp),xmm9
 793         .byte   0x13,0x88,0x02,0x00     #movaps 0x20(rsp),xmm8
 794         .byte   0x0d,0x78,0x01,0x00     #movaps 0x10(rsp),xmm7
 795         .byte   0x08,0x68,0x00,0x00     #movaps (rsp),xmm6
 796         .byte   0x04,0xa2,0x00,0x00     #sub    rsp,0x58
 797 ___
 798 }
 799 \f
 800 sub rex {
 801  local *opcode=shift;
 802  my ($dst,$src)=@_;
 803
 804    if ($dst>=8 || $src>=8) {
 805         $rex=0x40;
 806         $rex|=0x04 if($dst>=8);
 807         $rex|=0x01 if($src>=8);
 808         push @opcode,$rex;
 809    }
 810 }
 811
 812 sub pclmulqdq {
 813   my $arg=shift;
 814   my @opcode=(0x66);
 815
 816     if ($arg=~/\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
 817         rex(\@opcode,$3,$2);
 818         push @opcode,0x0f,0x3a,0x44;
 819         push @opcode,0xc0|($2&7)|(($3&7)<<3);   # ModR/M
 820         my $c=$1;
 821         push @opcode,$c=~/^0/?oct($c):$c;
 822         return ".byte\t".join(',',@opcode);
 823     }
 824     return "pclmulqdq\t".$arg;
 825 }
 826
 827 $code =~ s/\`([^\`]*)\`/eval($1)/gem;
 828 $code =~ s/\bpclmulqdq\s+(\$.*%xmm[0-9]+).*$/pclmulqdq($1)/gem;
 829
 830 print $code;
 831
 832 close STDOUT;