release/src/router/openssl/crypto/rc4/asm/rc4-s390x.pl

   1 #!/usr/bin/env perl
   2 #
   3 # ====================================================================
   4 # Written by Andy Polyakov <appro@fy.chalmers.se> 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 # February 2009
  11 #
  12 # Performance is 2x of gcc 3.4.6 on z10. Coding "secret" is to
  13 # "cluster" Address Generation Interlocks, so that one pipeline stall
  14 # resolves several dependencies.
  15
  16 # November 2010.
  17 #
  18 # Adapt for -m31 build. If kernel supports what's called "highgprs"
  19 # feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
  20 # instructions and achieve "64-bit" performance even in 31-bit legacy
  21 # application context. The feature is not specific to any particular
  22 # processor, as long as it's "z-CPU". Latter implies that the code
  23 # remains z/Architecture specific. On z990 it was measured to perform
  24 # 50% better than code generated by gcc 4.3.
  25
  26 $flavour = shift;
  27
  28 if ($flavour =~ /3[12]/) {
  29         $SIZE_T=4;
  30         $g="";
  31 } else {
  32         $SIZE_T=8;
  33         $g="g";
  34 }
  35
  36 while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
  37 open STDOUT,">$output";
  38
  39 $rp="%r14";
  40 $sp="%r15";
  41 $code=<<___;
  42 .text
  43
  44 ___
  45
  46 # void RC4(RC4_KEY *key,size_t len,const void *inp,void *out)
  47 {
  48 $acc="%r0";
  49 $cnt="%r1";
  50 $key="%r2";
  51 $len="%r3";
  52 $inp="%r4";
  53 $out="%r5";
  54
  55 @XX=("%r6","%r7");
  56 @TX=("%r8","%r9");
  57 $YY="%r10";
  58 $TY="%r11";
  59
  60 $code.=<<___;
  61 .globl  RC4
  62 .type   RC4,\@function
  63 .align  64
  64 RC4:
  65         stm${g} %r6,%r11,6*$SIZE_T($sp)
  66 ___
  67 $code.=<<___ if ($flavour =~ /3[12]/);
  68         llgfr   $len,$len
  69 ___
  70 $code.=<<___;
  71         llgc    $XX[0],0($key)
  72         llgc    $YY,1($key)
  73         la      $XX[0],1($XX[0])
  74         nill    $XX[0],0xff
  75         srlg    $cnt,$len,3
  76         ltgr    $cnt,$cnt
  77         llgc    $TX[0],2($XX[0],$key)
  78         jz      .Lshort
  79         j       .Loop8
  80
  81 .align  64
  82 .Loop8:
  83 ___
  84 for ($i=0;$i<8;$i++) {
  85 $code.=<<___;
  86         la      $YY,0($YY,$TX[0])       # $i
  87         nill    $YY,255
  88         la      $XX[1],1($XX[0])
  89         nill    $XX[1],255
  90 ___
  91 $code.=<<___ if ($i==1);
  92         llgc    $acc,2($TY,$key)
  93 ___
  94 $code.=<<___ if ($i>1);
  95         sllg    $acc,$acc,8
  96         ic      $acc,2($TY,$key)
  97 ___
  98 $code.=<<___;
  99         llgc    $TY,2($YY,$key)
 100         stc     $TX[0],2($YY,$key)
 101         llgc    $TX[1],2($XX[1],$key)
 102         stc     $TY,2($XX[0],$key)
 103         cr      $XX[1],$YY
 104         jne     .Lcmov$i
 105         la      $TX[1],0($TX[0])
 106 .Lcmov$i:
 107         la      $TY,0($TY,$TX[0])
 108         nill    $TY,255
 109 ___
 110 push(@TX,shift(@TX)); push(@XX,shift(@XX));     # "rotate" registers
 111 }
 112
 113 $code.=<<___;
 114         lg      $TX[1],0($inp)
 115         sllg    $acc,$acc,8
 116         la      $inp,8($inp)
 117         ic      $acc,2($TY,$key)
 118         xgr     $acc,$TX[1]
 119         stg     $acc,0($out)
 120         la      $out,8($out)
 121         brctg   $cnt,.Loop8
 122
 123 .Lshort:
 124         lghi    $acc,7
 125         ngr     $len,$acc
 126         jz      .Lexit
 127         j       .Loop1
 128
 129 .align  16
 130 .Loop1:
 131         la      $YY,0($YY,$TX[0])
 132         nill    $YY,255
 133         llgc    $TY,2($YY,$key)
 134         stc     $TX[0],2($YY,$key)
 135         stc     $TY,2($XX[0],$key)
 136         ar      $TY,$TX[0]
 137         ahi     $XX[0],1
 138         nill    $TY,255
 139         nill    $XX[0],255
 140         llgc    $acc,0($inp)
 141         la      $inp,1($inp)
 142         llgc    $TY,2($TY,$key)
 143         llgc    $TX[0],2($XX[0],$key)
 144         xr      $acc,$TY
 145         stc     $acc,0($out)
 146         la      $out,1($out)
 147         brct    $len,.Loop1
 148
 149 .Lexit:
 150         ahi     $XX[0],-1
 151         stc     $XX[0],0($key)
 152         stc     $YY,1($key)
 153         lm${g}  %r6,%r11,6*$SIZE_T($sp)
 154         br      $rp
 155 .size   RC4,.-RC4
 156 .string "RC4 for s390x, CRYPTOGAMS by <appro\@openssl.org>"
 157
 158 ___
 159 }
 160
 161 # void RC4_set_key(RC4_KEY *key,unsigned int len,const void *inp)
 162 {
 163 $cnt="%r0";
 164 $idx="%r1";
 165 $key="%r2";
 166 $len="%r3";
 167 $inp="%r4";
 168 $acc="%r5";
 169 $dat="%r6";
 170 $ikey="%r7";
 171 $iinp="%r8";
 172
 173 $code.=<<___;
 174 .globl  private_RC4_set_key
 175 .type   private_RC4_set_key,\@function
 176 .align  64
 177 private_RC4_set_key:
 178         stm${g} %r6,%r8,6*$SIZE_T($sp)
 179         lhi     $cnt,256
 180         la      $idx,0(%r0)
 181         sth     $idx,0($key)
 182 .align  4
 183 .L1stloop:
 184         stc     $idx,2($idx,$key)
 185         la      $idx,1($idx)
 186         brct    $cnt,.L1stloop
 187
 188         lghi    $ikey,-256
 189         lr      $cnt,$len
 190         la      $iinp,0(%r0)
 191         la      $idx,0(%r0)
 192 .align  16
 193 .L2ndloop:
 194         llgc    $acc,2+256($ikey,$key)
 195         llgc    $dat,0($iinp,$inp)
 196         la      $idx,0($idx,$acc)
 197         la      $ikey,1($ikey)
 198         la      $idx,0($idx,$dat)
 199         nill    $idx,255
 200         la      $iinp,1($iinp)
 201         tml     $ikey,255
 202         llgc    $dat,2($idx,$key)
 203         stc     $dat,2+256-1($ikey,$key)
 204         stc     $acc,2($idx,$key)
 205         jz      .Ldone
 206         brct    $cnt,.L2ndloop
 207         lr      $cnt,$len
 208         la      $iinp,0(%r0)
 209         j       .L2ndloop
 210 .Ldone:
 211         lm${g}  %r6,%r8,6*$SIZE_T($sp)
 212         br      $rp
 213 .size   private_RC4_set_key,.-private_RC4_set_key
 214
 215 ___
 216 }
 217
 218 # const char *RC4_options()
 219 $code.=<<___;
 220 .globl  RC4_options
 221 .type   RC4_options,\@function
 222 .align  16
 223 RC4_options:
 224         larl    %r2,.Loptions
 225         br      %r14
 226 .size   RC4_options,.-RC4_options
 227 .section        .rodata
 228 .Loptions:
 229 .align  8
 230 .string "rc4(8x,char)"
 231 ___
 232
 233 print $code;
 234 close STDOUT;   # force flush