crypto/modes/asm/ghash-s390x.pl

   1 #! /usr/bin/env perl
   2 # Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the OpenSSL license (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9
  10 # ====================================================================
  11 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
  12 # project. The module is, however, dual licensed under OpenSSL and
  13 # CRYPTOGAMS licenses depending on where you obtain it. For further
  14 # details see http://www.openssl.org/~appro/cryptogams/.
  15 # ====================================================================
  16
  17 # September 2010.
  18 #
  19 # The module implements "4-bit" GCM GHASH function and underlying
  20 # single multiplication operation in GF(2^128). "4-bit" means that it
  21 # uses 256 bytes per-key table [+128 bytes shared table]. Performance
  22 # was measured to be ~18 cycles per processed byte on z10, which is
  23 # almost 40% better than gcc-generated code. It should be noted that
  24 # 18 cycles is worse result than expected: loop is scheduled for 12
  25 # and the result should be close to 12. In the lack of instruction-
  26 # level profiling data it's impossible to tell why...
  27
  28 # November 2010.
  29 #
  30 # Adapt for -m31 build. If kernel supports what's called "highgprs"
  31 # feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
  32 # instructions and achieve "64-bit" performance even in 31-bit legacy
  33 # application context. The feature is not specific to any particular
  34 # processor, as long as it's "z-CPU". Latter implies that the code
  35 # remains z/Architecture specific. On z990 it was measured to perform
  36 # 2.8x better than 32-bit code generated by gcc 4.3.
  37
  38 # March 2011.
  39 #
  40 # Support for hardware KIMD-GHASH is verified to produce correct
  41 # result and therefore is engaged. On z196 it was measured to process
  42 # 8KB buffer ~7 faster than software implementation. It's not as
  43 # impressive for smaller buffer sizes and for smallest 16-bytes buffer
  44 # it's actually almost 2 times slower. Which is the reason why
  45 # KIMD-GHASH is not used in gcm_gmult_4bit.
  46
  47 $flavour = shift;
  48
  49 if ($flavour =~ /3[12]/) {
  50         $SIZE_T=4;
  51         $g="";
  52 } else {
  53         $SIZE_T=8;
  54         $g="g";
  55 }
  56
  57 while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {}
  58 open STDOUT,">$output";
  59
  60 $softonly=0;
  61
  62 $Zhi="%r0";
  63 $Zlo="%r1";
  64
  65 $Xi="%r2";      # argument block
  66 $Htbl="%r3";
  67 $inp="%r4";
  68 $len="%r5";
  69
  70 $rem0="%r6";    # variables
  71 $rem1="%r7";
  72 $nlo="%r8";
  73 $nhi="%r9";
  74 $xi="%r10";
  75 $cnt="%r11";
  76 $tmp="%r12";
  77 $x78="%r13";
  78 $rem_4bit="%r14";
  79
  80 $sp="%r15";
  81
  82 $code.=<<___;
  83 #include "s390x_arch.h"
  84
  85 .text
  86
  87 .globl  gcm_gmult_4bit
  88 .align  32
  89 gcm_gmult_4bit:
  90 ___
  91 $code.=<<___ if(!$softonly && 0);       # hardware is slow for single block...
  92         larl    %r1,OPENSSL_s390xcap_P
  93         lghi    %r0,0
  94         lg      %r1,S390X_KIMD+8(%r1)   # load second word of kimd capabilities
  95                                         #  vector
  96         tmhh    %r1,0x4000      # check for function 65
  97         jz      .Lsoft_gmult
  98         stg     %r0,16($sp)     # arrange 16 bytes of zero input
  99         stg     %r0,24($sp)
 100         lghi    %r0,S390X_GHASH # function 65
 101         la      %r1,0($Xi)      # H lies right after Xi in gcm128_context
 102         la      $inp,16($sp)
 103         lghi    $len,16
 104         .long   0xb93e0004      # kimd %r0,$inp
 105         brc     1,.-4           # pay attention to "partial completion"
 106         br      %r14
 107 .align  32
 108 .Lsoft_gmult:
 109 ___
 110 $code.=<<___;
 111         stm${g} %r6,%r14,6*$SIZE_T($sp)
 112
 113         aghi    $Xi,-1
 114         lghi    $len,1
 115         lghi    $x78,`0xf<<3`
 116         larl    $rem_4bit,rem_4bit
 117
 118         lg      $Zlo,8+1($Xi)           # Xi
 119         j       .Lgmult_shortcut
 120 .type   gcm_gmult_4bit,\@function
 121 .size   gcm_gmult_4bit,(.-gcm_gmult_4bit)
 122
 123 .globl  gcm_ghash_4bit
 124 .align  32
 125 gcm_ghash_4bit:
 126 ___
 127 $code.=<<___ if(!$softonly);
 128         larl    %r1,OPENSSL_s390xcap_P
 129         lg      %r0,S390X_KIMD+8(%r1)   # load second word of kimd capabilities
 130                                         #  vector
 131         tmhh    %r0,0x4000      # check for function 65
 132         jz      .Lsoft_ghash
 133         lghi    %r0,S390X_GHASH # function 65
 134         la      %r1,0($Xi)      # H lies right after Xi in gcm128_context
 135         .long   0xb93e0004      # kimd %r0,$inp
 136         brc     1,.-4           # pay attention to "partial completion"
 137         br      %r14
 138 .align  32
 139 .Lsoft_ghash:
 140 ___
 141 $code.=<<___ if ($flavour =~ /3[12]/);
 142         llgfr   $len,$len
 143 ___
 144 $code.=<<___;
 145         stm${g} %r6,%r14,6*$SIZE_T($sp)
 146
 147         aghi    $Xi,-1
 148         srlg    $len,$len,4
 149         lghi    $x78,`0xf<<3`
 150         larl    $rem_4bit,rem_4bit
 151
 152         lg      $Zlo,8+1($Xi)           # Xi
 153         lg      $Zhi,0+1($Xi)
 154         lghi    $tmp,0
 155 .Louter:
 156         xg      $Zhi,0($inp)            # Xi ^= inp
 157         xg      $Zlo,8($inp)
 158         xgr     $Zhi,$tmp
 159         stg     $Zlo,8+1($Xi)
 160         stg     $Zhi,0+1($Xi)
 161
 162 .Lgmult_shortcut:
 163         lghi    $tmp,0xf0
 164         sllg    $nlo,$Zlo,4
 165         srlg    $xi,$Zlo,8              # extract second byte
 166         ngr     $nlo,$tmp
 167         lgr     $nhi,$Zlo
 168         lghi    $cnt,14
 169         ngr     $nhi,$tmp
 170
 171         lg      $Zlo,8($nlo,$Htbl)
 172         lg      $Zhi,0($nlo,$Htbl)
 173
 174         sllg    $nlo,$xi,4
 175         sllg    $rem0,$Zlo,3
 176         ngr     $nlo,$tmp
 177         ngr     $rem0,$x78
 178         ngr     $xi,$tmp
 179
 180         sllg    $tmp,$Zhi,60
 181         srlg    $Zlo,$Zlo,4
 182         srlg    $Zhi,$Zhi,4
 183         xg      $Zlo,8($nhi,$Htbl)
 184         xg      $Zhi,0($nhi,$Htbl)
 185         lgr     $nhi,$xi
 186         sllg    $rem1,$Zlo,3
 187         xgr     $Zlo,$tmp
 188         ngr     $rem1,$x78
 189         sllg    $tmp,$Zhi,60
 190         j       .Lghash_inner
 191 .align  16
 192 .Lghash_inner:
 193         srlg    $Zlo,$Zlo,4
 194         srlg    $Zhi,$Zhi,4
 195         xg      $Zlo,8($nlo,$Htbl)
 196         llgc    $xi,0($cnt,$Xi)
 197         xg      $Zhi,0($nlo,$Htbl)
 198         sllg    $nlo,$xi,4
 199         xg      $Zhi,0($rem0,$rem_4bit)
 200         nill    $nlo,0xf0
 201         sllg    $rem0,$Zlo,3
 202         xgr     $Zlo,$tmp
 203         ngr     $rem0,$x78
 204         nill    $xi,0xf0
 205
 206         sllg    $tmp,$Zhi,60
 207         srlg    $Zlo,$Zlo,4
 208         srlg    $Zhi,$Zhi,4
 209         xg      $Zlo,8($nhi,$Htbl)
 210         xg      $Zhi,0($nhi,$Htbl)
 211         lgr     $nhi,$xi
 212         xg      $Zhi,0($rem1,$rem_4bit)
 213         sllg    $rem1,$Zlo,3
 214         xgr     $Zlo,$tmp
 215         ngr     $rem1,$x78
 216         sllg    $tmp,$Zhi,60
 217         brct    $cnt,.Lghash_inner
 218
 219         srlg    $Zlo,$Zlo,4
 220         srlg    $Zhi,$Zhi,4
 221         xg      $Zlo,8($nlo,$Htbl)
 222         xg      $Zhi,0($nlo,$Htbl)
 223         sllg    $xi,$Zlo,3
 224         xg      $Zhi,0($rem0,$rem_4bit)
 225         xgr     $Zlo,$tmp
 226         ngr     $xi,$x78
 227
 228         sllg    $tmp,$Zhi,60
 229         srlg    $Zlo,$Zlo,4
 230         srlg    $Zhi,$Zhi,4
 231         xg      $Zlo,8($nhi,$Htbl)
 232         xg      $Zhi,0($nhi,$Htbl)
 233         xgr     $Zlo,$tmp
 234         xg      $Zhi,0($rem1,$rem_4bit)
 235
 236         lg      $tmp,0($xi,$rem_4bit)
 237         la      $inp,16($inp)
 238         sllg    $tmp,$tmp,4             # correct last rem_4bit[rem]
 239         brctg   $len,.Louter
 240
 241         xgr     $Zhi,$tmp
 242         stg     $Zlo,8+1($Xi)
 243         stg     $Zhi,0+1($Xi)
 244         lm${g}  %r6,%r14,6*$SIZE_T($sp)
 245         br      %r14
 246 .type   gcm_ghash_4bit,\@function
 247 .size   gcm_ghash_4bit,(.-gcm_ghash_4bit)
 248
 249 .align  64
 250 rem_4bit:
 251         .long   `0x0000<<12`,0,`0x1C20<<12`,0,`0x3840<<12`,0,`0x2460<<12`,0
 252         .long   `0x7080<<12`,0,`0x6CA0<<12`,0,`0x48C0<<12`,0,`0x54E0<<12`,0
 253         .long   `0xE100<<12`,0,`0xFD20<<12`,0,`0xD940<<12`,0,`0xC560<<12`,0
 254         .long   `0x9180<<12`,0,`0x8DA0<<12`,0,`0xA9C0<<12`,0,`0xB5E0<<12`,0
 255 .type   rem_4bit,\@object
 256 .size   rem_4bit,(.-rem_4bit)
 257 .string "GHASH for s390x, CRYPTOGAMS by <appro\@openssl.org>"
 258 ___
 259
 260 $code =~ s/\`([^\`]*)\`/eval $1/gem;
 261 print $code;
 262 close STDOUT;