release/src/router/openssl/crypto/modes/asm/ghash-s390x.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 # September 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 it
  14 # uses 256 bytes per-key table [+128 bytes shared table]. Performance
  15 # was measured to be ~18 cycles per processed byte on z10, which is
  16 # almost 40% better than gcc-generated code. It should be noted that
  17 # 18 cycles is worse result than expected: loop is scheduled for 12
  18 # and the result should be close to 12. In the lack of instruction-
  19 # level profiling data it's impossible to tell why...
  20
  21 # November 2010.
  22 #
  23 # Adapt for -m31 build. If kernel supports what's called "highgprs"
  24 # feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
  25 # instructions and achieve "64-bit" performance even in 31-bit legacy
  26 # application context. The feature is not specific to any particular
  27 # processor, as long as it's "z-CPU". Latter implies that the code
  28 # remains z/Architecture specific. On z990 it was measured to perform
  29 # 2.8x better than 32-bit code generated by gcc 4.3.
  30
  31 # March 2011.
  32 #
  33 # Support for hardware KIMD-GHASH is verified to produce correct
  34 # result and therefore is engaged. On z196 it was measured to process
  35 # 8KB buffer ~7 faster than software implementation. It's not as
  36 # impressive for smaller buffer sizes and for smallest 16-bytes buffer
  37 # it's actually almost 2 times slower. Which is the reason why
  38 # KIMD-GHASH is not used in gcm_gmult_4bit.
  39
  40 $flavour = shift;
  41
  42 if ($flavour =~ /3[12]/) {
  43         $SIZE_T=4;
  44         $g="";
  45 } else {
  46         $SIZE_T=8;
  47         $g="g";
  48 }
  49
  50 while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
  51 open STDOUT,">$output";
  52
  53 $softonly=0;
  54
  55 $Zhi="%r0";
  56 $Zlo="%r1";
  57
  58 $Xi="%r2";      # argument block
  59 $Htbl="%r3";
  60 $inp="%r4";
  61 $len="%r5";
  62
  63 $rem0="%r6";    # variables
  64 $rem1="%r7";
  65 $nlo="%r8";
  66 $nhi="%r9";
  67 $xi="%r10";
  68 $cnt="%r11";
  69 $tmp="%r12";
  70 $x78="%r13";
  71 $rem_4bit="%r14";
  72
  73 $sp="%r15";
  74
  75 $code.=<<___;
  76 .text
  77
  78 .globl  gcm_gmult_4bit
  79 .align  32
  80 gcm_gmult_4bit:
  81 ___
  82 $code.=<<___ if(!$softonly && 0);       # hardware is slow for single block...
  83         larl    %r1,OPENSSL_s390xcap_P
  84         lg      %r0,0(%r1)
  85         tmhl    %r0,0x4000      # check for message-security-assist
  86         jz      .Lsoft_gmult
  87         lghi    %r0,0
  88         la      %r1,16($sp)
  89         .long   0xb93e0004      # kimd %r0,%r4
  90         lg      %r1,24($sp)
  91         tmhh    %r1,0x4000      # check for function 65
  92         jz      .Lsoft_gmult
  93         stg     %r0,16($sp)     # arrange 16 bytes of zero input
  94         stg     %r0,24($sp)
  95         lghi    %r0,65          # function 65
  96         la      %r1,0($Xi)      # H lies right after Xi in gcm128_context
  97         la      $inp,16($sp)
  98         lghi    $len,16
  99         .long   0xb93e0004      # kimd %r0,$inp
 100         brc     1,.-4           # pay attention to "partial completion"
 101         br      %r14
 102 .align  32
 103 .Lsoft_gmult:
 104 ___
 105 $code.=<<___;
 106         stm${g} %r6,%r14,6*$SIZE_T($sp)
 107
 108         aghi    $Xi,-1
 109         lghi    $len,1
 110         lghi    $x78,`0xf<<3`
 111         larl    $rem_4bit,rem_4bit
 112
 113         lg      $Zlo,8+1($Xi)           # Xi
 114         j       .Lgmult_shortcut
 115 .type   gcm_gmult_4bit,\@function
 116 .size   gcm_gmult_4bit,(.-gcm_gmult_4bit)
 117
 118 .globl  gcm_ghash_4bit
 119 .align  32
 120 gcm_ghash_4bit:
 121 ___
 122 $code.=<<___ if(!$softonly);
 123         larl    %r1,OPENSSL_s390xcap_P
 124         lg      %r0,0(%r1)
 125         tmhl    %r0,0x4000      # check for message-security-assist
 126         jz      .Lsoft_ghash
 127         lghi    %r0,0
 128         la      %r1,16($sp)
 129         .long   0xb93e0004      # kimd %r0,%r4
 130         lg      %r1,24($sp)
 131         tmhh    %r1,0x4000      # check for function 65
 132         jz      .Lsoft_ghash
 133         lghi    %r0,65          # 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         j       .Lghash_inner
 190 .align  16
 191 .Lghash_inner:
 192         srlg    $Zlo,$Zlo,4
 193         sllg    $tmp,$Zhi,60
 194         xg      $Zlo,8($nlo,$Htbl)
 195         srlg    $Zhi,$Zhi,4
 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         brct    $cnt,.Lghash_inner
 217
 218         sllg    $tmp,$Zhi,60
 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;