arch/arm64/crypto/sha512-armv8.pl

   1 #! /usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 # This code is taken from the OpenSSL project but the author (Andy Polyakov)
   5 # has relicensed it under the GPLv2. Therefore this program is free software;
   6 # you can redistribute it and/or modify it under the terms of the GNU General
   7 # Public License version 2 as published by the Free Software Foundation.
   8 #
   9 # The original headers, including the original license headers, are
  10 # included below for completeness.
  11
  12 # Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
  13 #
  14 # Licensed under the OpenSSL license (the "License").  You may not use
  15 # this file except in compliance with the License.  You can obtain a copy
  16 # in the file LICENSE in the source distribution or at
  17 # https://www.openssl.org/source/license.html
  18
  19 # ====================================================================
  20 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
  21 # project. The module is, however, dual licensed under OpenSSL and
  22 # CRYPTOGAMS licenses depending on where you obtain it. For further
  23 # details see http://www.openssl.org/~appro/cryptogams/.
  24 # ====================================================================
  25 #
  26 # SHA256/512 for ARMv8.
  27 #
  28 # Performance in cycles per processed byte and improvement coefficient
  29 # over code generated with "default" compiler:
  30 #
  31 #               SHA256-hw       SHA256(*)       SHA512
  32 # Apple A7      1.97            10.5 (+33%)     6.73 (-1%(**))
  33 # Cortex-A53    2.38            15.5 (+115%)    10.0 (+150%(***))
  34 # Cortex-A57    2.31            11.6 (+86%)     7.51 (+260%(***))
  35 # Denver        2.01            10.5 (+26%)     6.70 (+8%)
  36 # X-Gene                        20.0 (+100%)    12.8 (+300%(***))
  37 # Mongoose      2.36            13.0 (+50%)     8.36 (+33%)
  38 #
  39 # (*)   Software SHA256 results are of lesser relevance, presented
  40 #       mostly for informational purposes.
  41 # (**)  The result is a trade-off: it's possible to improve it by
  42 #       10% (or by 1 cycle per round), but at the cost of 20% loss
  43 #       on Cortex-A53 (or by 4 cycles per round).
  44 # (***) Super-impressive coefficients over gcc-generated code are
  45 #       indication of some compiler "pathology", most notably code
  46 #       generated with -mgeneral-regs-only is significanty faster
  47 #       and the gap is only 40-90%.
  48 #
  49 # October 2016.
  50 #
  51 # Originally it was reckoned that it makes no sense to implement NEON
  52 # version of SHA256 for 64-bit processors. This is because performance
  53 # improvement on most wide-spread Cortex-A5x processors was observed
  54 # to be marginal, same on Cortex-A53 and ~10% on A57. But then it was
  55 # observed that 32-bit NEON SHA256 performs significantly better than
  56 # 64-bit scalar version on *some* of the more recent processors. As
  57 # result 64-bit NEON version of SHA256 was added to provide best
  58 # all-round performance. For example it executes ~30% faster on X-Gene
  59 # and Mongoose. [For reference, NEON version of SHA512 is bound to
  60 # deliver much less improvement, likely *negative* on Cortex-A5x.
  61 # Which is why NEON support is limited to SHA256.]
  62
  63 $output=pop;
  64 $flavour=pop;
  65
  66 if ($flavour && $flavour ne "void") {
  67     $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  68     ( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
  69     ( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
  70     die "can't locate arm-xlate.pl";
  71
  72     open OUT,"| \"$^X\" $xlate $flavour $output";
  73     *STDOUT=*OUT;
  74 } else {
  75     open STDOUT,">$output";
  76 }
  77
  78 if ($output =~ /512/) {
  79         $BITS=512;
  80         $SZ=8;
  81         @Sigma0=(28,34,39);
  82         @Sigma1=(14,18,41);
  83         @sigma0=(1,  8, 7);
  84         @sigma1=(19,61, 6);
  85         $rounds=80;
  86         $reg_t="x";
  87 } else {
  88         $BITS=256;
  89         $SZ=4;
  90         @Sigma0=( 2,13,22);
  91         @Sigma1=( 6,11,25);
  92         @sigma0=( 7,18, 3);
  93         @sigma1=(17,19,10);
  94         $rounds=64;
  95         $reg_t="w";
  96 }
  97
  98 $func="sha${BITS}_block_data_order";
  99
 100 ($ctx,$inp,$num,$Ktbl)=map("x$_",(0..2,30));
 101
 102 @X=map("$reg_t$_",(3..15,0..2));
 103 @V=($A,$B,$C,$D,$E,$F,$G,$H)=map("$reg_t$_",(20..27));
 104 ($t0,$t1,$t2,$t3)=map("$reg_t$_",(16,17,19,28));
 105
 106 sub BODY_00_xx {
 107 my ($i,$a,$b,$c,$d,$e,$f,$g,$h)=@_;
 108 my $j=($i+1)&15;
 109 my ($T0,$T1,$T2)=(@X[($i-8)&15],@X[($i-9)&15],@X[($i-10)&15]);
 110    $T0=@X[$i+3] if ($i<11);
 111
 112 $code.=<<___    if ($i<16);
 113 #ifndef __AARCH64EB__
 114         rev     @X[$i],@X[$i]                   // $i
 115 #endif
 116 ___
 117 $code.=<<___    if ($i<13 && ($i&1));
 118         ldp     @X[$i+1],@X[$i+2],[$inp],#2*$SZ
 119 ___
 120 $code.=<<___    if ($i==13);
 121         ldp     @X[14],@X[15],[$inp]
 122 ___
 123 $code.=<<___    if ($i>=14);
 124         ldr     @X[($i-11)&15],[sp,#`$SZ*(($i-11)%4)`]
 125 ___
 126 $code.=<<___    if ($i>0 && $i<16);
 127         add     $a,$a,$t1                       // h+=Sigma0(a)
 128 ___
 129 $code.=<<___    if ($i>=11);
 130         str     @X[($i-8)&15],[sp,#`$SZ*(($i-8)%4)`]
 131 ___
 132 # While ARMv8 specifies merged rotate-n-logical operation such as
 133 # 'eor x,y,z,ror#n', it was found to negatively affect performance
 134 # on Apple A7. The reason seems to be that it requires even 'y' to
 135 # be available earlier. This means that such merged instruction is
 136 # not necessarily best choice on critical path... On the other hand
 137 # Cortex-A5x handles merged instructions much better than disjoint
 138 # rotate and logical... See (**) footnote above.
 139 $code.=<<___    if ($i<15);
 140         ror     $t0,$e,#$Sigma1[0]
 141         add     $h,$h,$t2                       // h+=K[i]
 142         eor     $T0,$e,$e,ror#`$Sigma1[2]-$Sigma1[1]`
 143         and     $t1,$f,$e
 144         bic     $t2,$g,$e
 145         add     $h,$h,@X[$i&15]                 // h+=X[i]
 146         orr     $t1,$t1,$t2                     // Ch(e,f,g)
 147         eor     $t2,$a,$b                       // a^b, b^c in next round
 148         eor     $t0,$t0,$T0,ror#$Sigma1[1]      // Sigma1(e)
 149         ror     $T0,$a,#$Sigma0[0]
 150         add     $h,$h,$t1                       // h+=Ch(e,f,g)
 151         eor     $t1,$a,$a,ror#`$Sigma0[2]-$Sigma0[1]`
 152         add     $h,$h,$t0                       // h+=Sigma1(e)
 153         and     $t3,$t3,$t2                     // (b^c)&=(a^b)
 154         add     $d,$d,$h                        // d+=h
 155         eor     $t3,$t3,$b                      // Maj(a,b,c)
 156         eor     $t1,$T0,$t1,ror#$Sigma0[1]      // Sigma0(a)
 157         add     $h,$h,$t3                       // h+=Maj(a,b,c)
 158         ldr     $t3,[$Ktbl],#$SZ                // *K++, $t2 in next round
 159         //add   $h,$h,$t1                       // h+=Sigma0(a)
 160 ___
 161 $code.=<<___    if ($i>=15);
 162         ror     $t0,$e,#$Sigma1[0]
 163         add     $h,$h,$t2                       // h+=K[i]
 164         ror     $T1,@X[($j+1)&15],#$sigma0[0]
 165         and     $t1,$f,$e
 166         ror     $T2,@X[($j+14)&15],#$sigma1[0]
 167         bic     $t2,$g,$e
 168         ror     $T0,$a,#$Sigma0[0]
 169         add     $h,$h,@X[$i&15]                 // h+=X[i]
 170         eor     $t0,$t0,$e,ror#$Sigma1[1]
 171         eor     $T1,$T1,@X[($j+1)&15],ror#$sigma0[1]
 172         orr     $t1,$t1,$t2                     // Ch(e,f,g)
 173         eor     $t2,$a,$b                       // a^b, b^c in next round
 174         eor     $t0,$t0,$e,ror#$Sigma1[2]       // Sigma1(e)
 175         eor     $T0,$T0,$a,ror#$Sigma0[1]
 176         add     $h,$h,$t1                       // h+=Ch(e,f,g)
 177         and     $t3,$t3,$t2                     // (b^c)&=(a^b)
 178         eor     $T2,$T2,@X[($j+14)&15],ror#$sigma1[1]
 179         eor     $T1,$T1,@X[($j+1)&15],lsr#$sigma0[2]    // sigma0(X[i+1])
 180         add     $h,$h,$t0                       // h+=Sigma1(e)
 181         eor     $t3,$t3,$b                      // Maj(a,b,c)
 182         eor     $t1,$T0,$a,ror#$Sigma0[2]       // Sigma0(a)
 183         eor     $T2,$T2,@X[($j+14)&15],lsr#$sigma1[2]   // sigma1(X[i+14])
 184         add     @X[$j],@X[$j],@X[($j+9)&15]
 185         add     $d,$d,$h                        // d+=h
 186         add     $h,$h,$t3                       // h+=Maj(a,b,c)
 187         ldr     $t3,[$Ktbl],#$SZ                // *K++, $t2 in next round
 188         add     @X[$j],@X[$j],$T1
 189         add     $h,$h,$t1                       // h+=Sigma0(a)
 190         add     @X[$j],@X[$j],$T2
 191 ___
 192         ($t2,$t3)=($t3,$t2);
 193 }
 194
 195 $code.=<<___;
 196 #ifndef __KERNEL__
 197 # include "arm_arch.h"
 198 #endif
 199
 200 .text
 201
 202 .extern OPENSSL_armcap_P
 203 .globl  $func
 204 .type   $func,%function
 205 .align  6
 206 $func:
 207 ___
 208 $code.=<<___    if ($SZ==4);
 209 #ifndef __KERNEL__
 210 # ifdef __ILP32__
 211         ldrsw   x16,.LOPENSSL_armcap_P
 212 # else
 213         ldr     x16,.LOPENSSL_armcap_P
 214 # endif
 215         adr     x17,.LOPENSSL_armcap_P
 216         add     x16,x16,x17
 217         ldr     w16,[x16]
 218         tst     w16,#ARMV8_SHA256
 219         b.ne    .Lv8_entry
 220         tst     w16,#ARMV7_NEON
 221         b.ne    .Lneon_entry
 222 #endif
 223 ___
 224 $code.=<<___;
 225         stp     x29,x30,[sp,#-128]!
 226         add     x29,sp,#0
 227
 228         stp     x19,x20,[sp,#16]
 229         stp     x21,x22,[sp,#32]
 230         stp     x23,x24,[sp,#48]
 231         stp     x25,x26,[sp,#64]
 232         stp     x27,x28,[sp,#80]
 233         sub     sp,sp,#4*$SZ
 234
 235         ldp     $A,$B,[$ctx]                            // load context
 236         ldp     $C,$D,[$ctx,#2*$SZ]
 237         ldp     $E,$F,[$ctx,#4*$SZ]
 238         add     $num,$inp,$num,lsl#`log(16*$SZ)/log(2)` // end of input
 239         ldp     $G,$H,[$ctx,#6*$SZ]
 240         adr     $Ktbl,.LK$BITS
 241         stp     $ctx,$num,[x29,#96]
 242
 243 .Loop:
 244         ldp     @X[0],@X[1],[$inp],#2*$SZ
 245         ldr     $t2,[$Ktbl],#$SZ                        // *K++
 246         eor     $t3,$B,$C                               // magic seed
 247         str     $inp,[x29,#112]
 248 ___
 249 for ($i=0;$i<16;$i++)   { &BODY_00_xx($i,@V); unshift(@V,pop(@V)); }
 250 $code.=".Loop_16_xx:\n";
 251 for (;$i<32;$i++)       { &BODY_00_xx($i,@V); unshift(@V,pop(@V)); }
 252 $code.=<<___;
 253         cbnz    $t2,.Loop_16_xx
 254
 255         ldp     $ctx,$num,[x29,#96]
 256         ldr     $inp,[x29,#112]
 257         sub     $Ktbl,$Ktbl,#`$SZ*($rounds+1)`          // rewind
 258
 259         ldp     @X[0],@X[1],[$ctx]
 260         ldp     @X[2],@X[3],[$ctx,#2*$SZ]
 261         add     $inp,$inp,#14*$SZ                       // advance input pointer
 262         ldp     @X[4],@X[5],[$ctx,#4*$SZ]
 263         add     $A,$A,@X[0]
 264         ldp     @X[6],@X[7],[$ctx,#6*$SZ]
 265         add     $B,$B,@X[1]
 266         add     $C,$C,@X[2]
 267         add     $D,$D,@X[3]
 268         stp     $A,$B,[$ctx]
 269         add     $E,$E,@X[4]
 270         add     $F,$F,@X[5]
 271         stp     $C,$D,[$ctx,#2*$SZ]
 272         add     $G,$G,@X[6]
 273         add     $H,$H,@X[7]
 274         cmp     $inp,$num
 275         stp     $E,$F,[$ctx,#4*$SZ]
 276         stp     $G,$H,[$ctx,#6*$SZ]
 277         b.ne    .Loop
 278
 279         ldp     x19,x20,[x29,#16]
 280         add     sp,sp,#4*$SZ
 281         ldp     x21,x22,[x29,#32]
 282         ldp     x23,x24,[x29,#48]
 283         ldp     x25,x26,[x29,#64]
 284         ldp     x27,x28,[x29,#80]
 285         ldp     x29,x30,[sp],#128
 286         ret
 287 .size   $func,.-$func
 288
 289 .align  6
 290 .type   .LK$BITS,%object
 291 .LK$BITS:
 292 ___
 293 $code.=<<___ if ($SZ==8);
 294         .quad   0x428a2f98d728ae22,0x7137449123ef65cd
 295         .quad   0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc
 296         .quad   0x3956c25bf348b538,0x59f111f1b605d019
 297         .quad   0x923f82a4af194f9b,0xab1c5ed5da6d8118
 298         .quad   0xd807aa98a3030242,0x12835b0145706fbe
 299         .quad   0x243185be4ee4b28c,0x550c7dc3d5ffb4e2
 300         .quad   0x72be5d74f27b896f,0x80deb1fe3b1696b1
 301         .quad   0x9bdc06a725c71235,0xc19bf174cf692694
 302         .quad   0xe49b69c19ef14ad2,0xefbe4786384f25e3
 303         .quad   0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65
 304         .quad   0x2de92c6f592b0275,0x4a7484aa6ea6e483
 305         .quad   0x5cb0a9dcbd41fbd4,0x76f988da831153b5
 306         .quad   0x983e5152ee66dfab,0xa831c66d2db43210
 307         .quad   0xb00327c898fb213f,0xbf597fc7beef0ee4
 308         .quad   0xc6e00bf33da88fc2,0xd5a79147930aa725
 309         .quad   0x06ca6351e003826f,0x142929670a0e6e70
 310         .quad   0x27b70a8546d22ffc,0x2e1b21385c26c926
 311         .quad   0x4d2c6dfc5ac42aed,0x53380d139d95b3df
 312         .quad   0x650a73548baf63de,0x766a0abb3c77b2a8
 313         .quad   0x81c2c92e47edaee6,0x92722c851482353b
 314         .quad   0xa2bfe8a14cf10364,0xa81a664bbc423001
 315         .quad   0xc24b8b70d0f89791,0xc76c51a30654be30
 316         .quad   0xd192e819d6ef5218,0xd69906245565a910
 317         .quad   0xf40e35855771202a,0x106aa07032bbd1b8
 318         .quad   0x19a4c116b8d2d0c8,0x1e376c085141ab53
 319         .quad   0x2748774cdf8eeb99,0x34b0bcb5e19b48a8
 320         .quad   0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb
 321         .quad   0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3
 322         .quad   0x748f82ee5defb2fc,0x78a5636f43172f60
 323         .quad   0x84c87814a1f0ab72,0x8cc702081a6439ec
 324         .quad   0x90befffa23631e28,0xa4506cebde82bde9
 325         .quad   0xbef9a3f7b2c67915,0xc67178f2e372532b
 326         .quad   0xca273eceea26619c,0xd186b8c721c0c207
 327         .quad   0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178
 328         .quad   0x06f067aa72176fba,0x0a637dc5a2c898a6
 329         .quad   0x113f9804bef90dae,0x1b710b35131c471b
 330         .quad   0x28db77f523047d84,0x32caab7b40c72493
 331         .quad   0x3c9ebe0a15c9bebc,0x431d67c49c100d4c
 332         .quad   0x4cc5d4becb3e42b6,0x597f299cfc657e2a
 333         .quad   0x5fcb6fab3ad6faec,0x6c44198c4a475817
 334         .quad   0       // terminator
 335 ___
 336 $code.=<<___ if ($SZ==4);
 337         .long   0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
 338         .long   0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
 339         .long   0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
 340         .long   0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
 341         .long   0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
 342         .long   0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
 343         .long   0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
 344         .long   0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
 345         .long   0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
 346         .long   0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
 347         .long   0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
 348         .long   0xd192e819,0xd6990624,0xf40e3585,0x106aa070
 349         .long   0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
 350         .long   0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
 351         .long   0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
 352         .long   0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
 353         .long   0       //terminator
 354 ___
 355 $code.=<<___;
 356 .size   .LK$BITS,.-.LK$BITS
 357 #ifndef __KERNEL__
 358 .align  3
 359 .LOPENSSL_armcap_P:
 360 # ifdef __ILP32__
 361         .long   OPENSSL_armcap_P-.
 362 # else
 363         .quad   OPENSSL_armcap_P-.
 364 # endif
 365 #endif
 366 .asciz  "SHA$BITS block transform for ARMv8, CRYPTOGAMS by <appro\@openssl.org>"
 367 .align  2
 368 ___
 369
 370 if ($SZ==4) {
 371 my $Ktbl="x3";
 372
 373 my ($ABCD,$EFGH,$abcd)=map("v$_.16b",(0..2));
 374 my @MSG=map("v$_.16b",(4..7));
 375 my ($W0,$W1)=("v16.4s","v17.4s");
 376 my ($ABCD_SAVE,$EFGH_SAVE)=("v18.16b","v19.16b");
 377
 378 $code.=<<___;
 379 #ifndef __KERNEL__
 380 .type   sha256_block_armv8,%function
 381 .align  6
 382 sha256_block_armv8:
 383 .Lv8_entry:
 384         stp             x29,x30,[sp,#-16]!
 385         add             x29,sp,#0
 386
 387         ld1.32          {$ABCD,$EFGH},[$ctx]
 388         adr             $Ktbl,.LK256
 389
 390 .Loop_hw:
 391         ld1             {@MSG[0]-@MSG[3]},[$inp],#64
 392         sub             $num,$num,#1
 393         ld1.32          {$W0},[$Ktbl],#16
 394         rev32           @MSG[0],@MSG[0]
 395         rev32           @MSG[1],@MSG[1]
 396         rev32           @MSG[2],@MSG[2]
 397         rev32           @MSG[3],@MSG[3]
 398         orr             $ABCD_SAVE,$ABCD,$ABCD          // offload
 399         orr             $EFGH_SAVE,$EFGH,$EFGH
 400 ___
 401 for($i=0;$i<12;$i++) {
 402 $code.=<<___;
 403         ld1.32          {$W1},[$Ktbl],#16
 404         add.i32         $W0,$W0,@MSG[0]
 405         sha256su0       @MSG[0],@MSG[1]
 406         orr             $abcd,$ABCD,$ABCD
 407         sha256h         $ABCD,$EFGH,$W0
 408         sha256h2        $EFGH,$abcd,$W0
 409         sha256su1       @MSG[0],@MSG[2],@MSG[3]
 410 ___
 411         ($W0,$W1)=($W1,$W0);    push(@MSG,shift(@MSG));
 412 }
 413 $code.=<<___;
 414         ld1.32          {$W1},[$Ktbl],#16
 415         add.i32         $W0,$W0,@MSG[0]
 416         orr             $abcd,$ABCD,$ABCD
 417         sha256h         $ABCD,$EFGH,$W0
 418         sha256h2        $EFGH,$abcd,$W0
 419
 420         ld1.32          {$W0},[$Ktbl],#16
 421         add.i32         $W1,$W1,@MSG[1]
 422         orr             $abcd,$ABCD,$ABCD
 423         sha256h         $ABCD,$EFGH,$W1
 424         sha256h2        $EFGH,$abcd,$W1
 425
 426         ld1.32          {$W1},[$Ktbl]
 427         add.i32         $W0,$W0,@MSG[2]
 428         sub             $Ktbl,$Ktbl,#$rounds*$SZ-16     // rewind
 429         orr             $abcd,$ABCD,$ABCD
 430         sha256h         $ABCD,$EFGH,$W0
 431         sha256h2        $EFGH,$abcd,$W0
 432
 433         add.i32         $W1,$W1,@MSG[3]
 434         orr             $abcd,$ABCD,$ABCD
 435         sha256h         $ABCD,$EFGH,$W1
 436         sha256h2        $EFGH,$abcd,$W1
 437
 438         add.i32         $ABCD,$ABCD,$ABCD_SAVE
 439         add.i32         $EFGH,$EFGH,$EFGH_SAVE
 440
 441         cbnz            $num,.Loop_hw
 442
 443         st1.32          {$ABCD,$EFGH},[$ctx]
 444
 445         ldr             x29,[sp],#16
 446         ret
 447 .size   sha256_block_armv8,.-sha256_block_armv8
 448 #endif
 449 ___
 450 }
 451
 452 if ($SZ==4) {   ######################################### NEON stuff #
 453 # You'll surely note a lot of similarities with sha256-armv4 module,
 454 # and of course it's not a coincidence. sha256-armv4 was used as
 455 # initial template, but was adapted for ARMv8 instruction set and
 456 # extensively re-tuned for all-round performance.
 457
 458 my @V = ($A,$B,$C,$D,$E,$F,$G,$H) = map("w$_",(3..10));
 459 my ($t0,$t1,$t2,$t3,$t4) = map("w$_",(11..15));
 460 my $Ktbl="x16";
 461 my $Xfer="x17";
 462 my @X = map("q$_",(0..3));
 463 my ($T0,$T1,$T2,$T3,$T4,$T5,$T6,$T7) = map("q$_",(4..7,16..19));
 464 my $j=0;
 465
 466 sub AUTOLOAD()          # thunk [simplified] x86-style perlasm
 467 { my $opcode = $AUTOLOAD; $opcode =~ s/.*:://; $opcode =~ s/_/\./;
 468   my $arg = pop;
 469     $arg = "#$arg" if ($arg*1 eq $arg);
 470     $code .= "\t$opcode\t".join(',',@_,$arg)."\n";
 471 }
 472
 473 sub Dscalar { shift =~ m|[qv]([0-9]+)|?"d$1":""; }
 474 sub Dlo     { shift =~ m|[qv]([0-9]+)|?"v$1.d[0]":""; }
 475 sub Dhi     { shift =~ m|[qv]([0-9]+)|?"v$1.d[1]":""; }
 476
 477 sub Xupdate()
 478 { use integer;
 479   my $body = shift;
 480   my @insns = (&$body,&$body,&$body,&$body);
 481   my ($a,$b,$c,$d,$e,$f,$g,$h);
 482
 483         &ext_8          ($T0,@X[0],@X[1],4);    # X[1..4]
 484          eval(shift(@insns));
 485          eval(shift(@insns));
 486          eval(shift(@insns));
 487         &ext_8          ($T3,@X[2],@X[3],4);    # X[9..12]
 488          eval(shift(@insns));
 489          eval(shift(@insns));
 490         &mov            (&Dscalar($T7),&Dhi(@X[3]));    # X[14..15]
 491          eval(shift(@insns));
 492          eval(shift(@insns));
 493         &ushr_32        ($T2,$T0,$sigma0[0]);
 494          eval(shift(@insns));
 495         &ushr_32        ($T1,$T0,$sigma0[2]);
 496          eval(shift(@insns));
 497         &add_32         (@X[0],@X[0],$T3);      # X[0..3] += X[9..12]
 498          eval(shift(@insns));
 499         &sli_32         ($T2,$T0,32-$sigma0[0]);
 500          eval(shift(@insns));
 501          eval(shift(@insns));
 502         &ushr_32        ($T3,$T0,$sigma0[1]);
 503          eval(shift(@insns));
 504          eval(shift(@insns));
 505         &eor_8          ($T1,$T1,$T2);
 506          eval(shift(@insns));
 507          eval(shift(@insns));
 508         &sli_32         ($T3,$T0,32-$sigma0[1]);
 509          eval(shift(@insns));
 510          eval(shift(@insns));
 511           &ushr_32      ($T4,$T7,$sigma1[0]);
 512          eval(shift(@insns));
 513          eval(shift(@insns));
 514         &eor_8          ($T1,$T1,$T3);          # sigma0(X[1..4])
 515          eval(shift(@insns));
 516          eval(shift(@insns));
 517           &sli_32       ($T4,$T7,32-$sigma1[0]);
 518          eval(shift(@insns));
 519          eval(shift(@insns));
 520           &ushr_32      ($T5,$T7,$sigma1[2]);
 521          eval(shift(@insns));
 522          eval(shift(@insns));
 523           &ushr_32      ($T3,$T7,$sigma1[1]);
 524          eval(shift(@insns));
 525          eval(shift(@insns));
 526         &add_32         (@X[0],@X[0],$T1);      # X[0..3] += sigma0(X[1..4])
 527          eval(shift(@insns));
 528          eval(shift(@insns));
 529           &sli_u32      ($T3,$T7,32-$sigma1[1]);
 530          eval(shift(@insns));
 531          eval(shift(@insns));
 532           &eor_8        ($T5,$T5,$T4);
 533          eval(shift(@insns));
 534          eval(shift(@insns));
 535          eval(shift(@insns));
 536           &eor_8        ($T5,$T5,$T3);          # sigma1(X[14..15])
 537          eval(shift(@insns));
 538          eval(shift(@insns));
 539          eval(shift(@insns));
 540         &add_32         (@X[0],@X[0],$T5);      # X[0..1] += sigma1(X[14..15])
 541          eval(shift(@insns));
 542          eval(shift(@insns));
 543          eval(shift(@insns));
 544           &ushr_32      ($T6,@X[0],$sigma1[0]);
 545          eval(shift(@insns));
 546           &ushr_32      ($T7,@X[0],$sigma1[2]);
 547          eval(shift(@insns));
 548          eval(shift(@insns));
 549           &sli_32       ($T6,@X[0],32-$sigma1[0]);
 550          eval(shift(@insns));
 551           &ushr_32      ($T5,@X[0],$sigma1[1]);
 552          eval(shift(@insns));
 553          eval(shift(@insns));
 554           &eor_8        ($T7,$T7,$T6);
 555          eval(shift(@insns));
 556          eval(shift(@insns));
 557           &sli_32       ($T5,@X[0],32-$sigma1[1]);
 558          eval(shift(@insns));
 559          eval(shift(@insns));
 560         &ld1_32         ("{$T0}","[$Ktbl], #16");
 561          eval(shift(@insns));
 562           &eor_8        ($T7,$T7,$T5);          # sigma1(X[16..17])
 563          eval(shift(@insns));
 564          eval(shift(@insns));
 565         &eor_8          ($T5,$T5,$T5);
 566          eval(shift(@insns));
 567          eval(shift(@insns));
 568         &mov            (&Dhi($T5), &Dlo($T7));
 569          eval(shift(@insns));
 570          eval(shift(@insns));
 571          eval(shift(@insns));
 572         &add_32         (@X[0],@X[0],$T5);      # X[2..3] += sigma1(X[16..17])
 573          eval(shift(@insns));
 574          eval(shift(@insns));
 575          eval(shift(@insns));
 576         &add_32         ($T0,$T0,@X[0]);
 577          while($#insns>=1) { eval(shift(@insns)); }
 578         &st1_32         ("{$T0}","[$Xfer], #16");
 579          eval(shift(@insns));
 580
 581         push(@X,shift(@X));             # "rotate" X[]
 582 }
 583
 584 sub Xpreload()
 585 { use integer;
 586   my $body = shift;
 587   my @insns = (&$body,&$body,&$body,&$body);
 588   my ($a,$b,$c,$d,$e,$f,$g,$h);
 589
 590          eval(shift(@insns));
 591          eval(shift(@insns));
 592         &ld1_8          ("{@X[0]}","[$inp],#16");
 593          eval(shift(@insns));
 594          eval(shift(@insns));
 595         &ld1_32         ("{$T0}","[$Ktbl],#16");
 596          eval(shift(@insns));
 597          eval(shift(@insns));
 598          eval(shift(@insns));
 599          eval(shift(@insns));
 600         &rev32          (@X[0],@X[0]);
 601          eval(shift(@insns));
 602          eval(shift(@insns));
 603          eval(shift(@insns));
 604          eval(shift(@insns));
 605         &add_32         ($T0,$T0,@X[0]);
 606          foreach (@insns) { eval; }     # remaining instructions
 607         &st1_32         ("{$T0}","[$Xfer], #16");
 608
 609         push(@X,shift(@X));             # "rotate" X[]
 610 }
 611
 612 sub body_00_15 () {
 613         (
 614         '($a,$b,$c,$d,$e,$f,$g,$h)=@V;'.
 615         '&add   ($h,$h,$t1)',                   # h+=X[i]+K[i]
 616         '&add   ($a,$a,$t4);'.                  # h+=Sigma0(a) from the past
 617         '&and   ($t1,$f,$e)',
 618         '&bic   ($t4,$g,$e)',
 619         '&eor   ($t0,$e,$e,"ror#".($Sigma1[1]-$Sigma1[0]))',
 620         '&add   ($a,$a,$t2)',                   # h+=Maj(a,b,c) from the past
 621         '&orr   ($t1,$t1,$t4)',                 # Ch(e,f,g)
 622         '&eor   ($t0,$t0,$e,"ror#".($Sigma1[2]-$Sigma1[0]))',   # Sigma1(e)
 623         '&eor   ($t4,$a,$a,"ror#".($Sigma0[1]-$Sigma0[0]))',
 624         '&add   ($h,$h,$t1)',                   # h+=Ch(e,f,g)
 625         '&ror   ($t0,$t0,"#$Sigma1[0]")',
 626         '&eor   ($t2,$a,$b)',                   # a^b, b^c in next round
 627         '&eor   ($t4,$t4,$a,"ror#".($Sigma0[2]-$Sigma0[0]))',   # Sigma0(a)
 628         '&add   ($h,$h,$t0)',                   # h+=Sigma1(e)
 629         '&ldr   ($t1,sprintf "[sp,#%d]",4*(($j+1)&15))  if (($j&15)!=15);'.
 630         '&ldr   ($t1,"[$Ktbl]")                         if ($j==15);'.
 631         '&and   ($t3,$t3,$t2)',                 # (b^c)&=(a^b)
 632         '&ror   ($t4,$t4,"#$Sigma0[0]")',
 633         '&add   ($d,$d,$h)',                    # d+=h
 634         '&eor   ($t3,$t3,$b)',                  # Maj(a,b,c)
 635         '$j++;  unshift(@V,pop(@V)); ($t2,$t3)=($t3,$t2);'
 636         )
 637 }
 638
 639 $code.=<<___;
 640 #ifdef  __KERNEL__
 641 .globl  sha256_block_neon
 642 #endif
 643 .type   sha256_block_neon,%function
 644 .align  4
 645 sha256_block_neon:
 646 .Lneon_entry:
 647         stp     x29, x30, [sp, #-16]!
 648         mov     x29, sp
 649         sub     sp,sp,#16*4
 650
 651         adr     $Ktbl,.LK256
 652         add     $num,$inp,$num,lsl#6    // len to point at the end of inp
 653
 654         ld1.8   {@X[0]},[$inp], #16
 655         ld1.8   {@X[1]},[$inp], #16
 656         ld1.8   {@X[2]},[$inp], #16
 657         ld1.8   {@X[3]},[$inp], #16
 658         ld1.32  {$T0},[$Ktbl], #16
 659         ld1.32  {$T1},[$Ktbl], #16
 660         ld1.32  {$T2},[$Ktbl], #16
 661         ld1.32  {$T3},[$Ktbl], #16
 662         rev32   @X[0],@X[0]             // yes, even on
 663         rev32   @X[1],@X[1]             // big-endian
 664         rev32   @X[2],@X[2]
 665         rev32   @X[3],@X[3]
 666         mov     $Xfer,sp
 667         add.32  $T0,$T0,@X[0]
 668         add.32  $T1,$T1,@X[1]
 669         add.32  $T2,$T2,@X[2]
 670         st1.32  {$T0-$T1},[$Xfer], #32
 671         add.32  $T3,$T3,@X[3]
 672         st1.32  {$T2-$T3},[$Xfer]
 673         sub     $Xfer,$Xfer,#32
 674
 675         ldp     $A,$B,[$ctx]
 676         ldp     $C,$D,[$ctx,#8]
 677         ldp     $E,$F,[$ctx,#16]
 678         ldp     $G,$H,[$ctx,#24]
 679         ldr     $t1,[sp,#0]
 680         mov     $t2,wzr
 681         eor     $t3,$B,$C
 682         mov     $t4,wzr
 683         b       .L_00_48
 684
 685 .align  4
 686 .L_00_48:
 687 ___
 688         &Xupdate(\&body_00_15);
 689         &Xupdate(\&body_00_15);
 690         &Xupdate(\&body_00_15);
 691         &Xupdate(\&body_00_15);
 692 $code.=<<___;
 693         cmp     $t1,#0                          // check for K256 terminator
 694         ldr     $t1,[sp,#0]
 695         sub     $Xfer,$Xfer,#64
 696         bne     .L_00_48
 697
 698         sub     $Ktbl,$Ktbl,#256                // rewind $Ktbl
 699         cmp     $inp,$num
 700         mov     $Xfer, #64
 701         csel    $Xfer, $Xfer, xzr, eq
 702         sub     $inp,$inp,$Xfer                 // avoid SEGV
 703         mov     $Xfer,sp
 704 ___
 705         &Xpreload(\&body_00_15);
 706         &Xpreload(\&body_00_15);
 707         &Xpreload(\&body_00_15);
 708         &Xpreload(\&body_00_15);
 709 $code.=<<___;
 710         add     $A,$A,$t4                       // h+=Sigma0(a) from the past
 711         ldp     $t0,$t1,[$ctx,#0]
 712         add     $A,$A,$t2                       // h+=Maj(a,b,c) from the past
 713         ldp     $t2,$t3,[$ctx,#8]
 714         add     $A,$A,$t0                       // accumulate
 715         add     $B,$B,$t1
 716         ldp     $t0,$t1,[$ctx,#16]
 717         add     $C,$C,$t2
 718         add     $D,$D,$t3
 719         ldp     $t2,$t3,[$ctx,#24]
 720         add     $E,$E,$t0
 721         add     $F,$F,$t1
 722          ldr    $t1,[sp,#0]
 723         stp     $A,$B,[$ctx,#0]
 724         add     $G,$G,$t2
 725          mov    $t2,wzr
 726         stp     $C,$D,[$ctx,#8]
 727         add     $H,$H,$t3
 728         stp     $E,$F,[$ctx,#16]
 729          eor    $t3,$B,$C
 730         stp     $G,$H,[$ctx,#24]
 731          mov    $t4,wzr
 732          mov    $Xfer,sp
 733         b.ne    .L_00_48
 734
 735         ldr     x29,[x29]
 736         add     sp,sp,#16*4+16
 737         ret
 738 .size   sha256_block_neon,.-sha256_block_neon
 739 ___
 740 }
 741
 742 $code.=<<___;
 743 #ifndef __KERNEL__
 744 .comm   OPENSSL_armcap_P,4,4
 745 #endif
 746 ___
 747
 748 {   my  %opcode = (
 749         "sha256h"       => 0x5e004000,  "sha256h2"      => 0x5e005000,
 750         "sha256su0"     => 0x5e282800,  "sha256su1"     => 0x5e006000   );
 751
 752     sub unsha256 {
 753         my ($mnemonic,$arg)=@_;
 754
 755         $arg =~ m/[qv]([0-9]+)[^,]*,\s*[qv]([0-9]+)[^,]*(?:,\s*[qv]([0-9]+))?/o
 756         &&
 757         sprintf ".inst\t0x%08x\t//%s %s",
 758                         $opcode{$mnemonic}|$1|($2<<5)|($3<<16),
 759                         $mnemonic,$arg;
 760     }
 761 }
 762
 763 open SELF,$0;
 764 while(<SELF>) {
 765         next if (/^#!/);
 766         last if (!s/^#/\/\// and !/^$/);
 767         print;
 768 }
 769 close SELF;
 770
 771 foreach(split("\n",$code)) {
 772
 773         s/\`([^\`]*)\`/eval($1)/ge;
 774
 775         s/\b(sha256\w+)\s+([qv].*)/unsha256($1,$2)/ge;
 776
 777         s/\bq([0-9]+)\b/v$1.16b/g;              # old->new registers
 778
 779         s/\.[ui]?8(\s)/$1/;
 780         s/\.\w?32\b//           and s/\.16b/\.4s/g;
 781         m/(ld|st)1[^\[]+\[0\]/  and s/\.4s/\.s/g;
 782
 783         print $_,"\n";
 784 }
 785
 786 close STDOUT;