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#!/usr/bin/env perl
# ====================================================================
# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see http://www.openssl.org/~appro/cryptogams/.
# ====================================================================
# September 2010.
while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
open STDOUT,">$output";
$Zhi="%r0";
$Zlo="%r1";
$Xi="%r2"; # argument block
$Htbl="%r3";
$inp="%r4";
$len="%r5";
$rem0="%r6"; # variables
$rem1="%r7";
$nlo="%r8";
$nhi="%r9";
$xi="%r10";
$cnt="%r11";
$tmp="%r12";
$x78="%r13";
$rem_4bit="%r14";
$sp="%r15";
$code.=<<___;
.text
.globl gcm_gmult_4bit
.align 32
gcm_gmult_4bit:
stmg %r6,%r14,48($sp)
aghi $Xi,-1
lghi $len,1
lghi $x78,`0xf<<3`
larl $rem_4bit,rem_4bit
lg $Zlo,8+1($Xi) # Xi
j .Lgmult_shortcut
.type gcm_gmult_4bit,\@function
.size gcm_gmult_4bit,(.-gcm_gmult_4bit)
.globl gcm_ghash_4bit
.align 32
gcm_ghash_4bit:
stmg %r6,%r14,48($sp)
aghi $Xi,-1
srlg $len,$len,4
lghi $x78,`0xf<<3`
larl $rem_4bit,rem_4bit
lg $Zlo,8+1($Xi) # Xi
lg $Zhi,0+1($Xi)
.Louter:
xg $Zlo,8($inp) # Xi ^= inp
xg $Zhi,0($inp)
stg $Zlo,8+1($Xi)
stg $Zhi,0+1($Xi)
.Lgmult_shortcut:
lghi $tmp,0xff
srlg $xi,$Zlo,8 # extract first two bytes
lgr $nhi,$Zlo
ngr $xi,$tmp
ngr $nhi,$tmp
sllg $nlo,$nhi,4
nill $nhi,0xf0
nill $nlo,0xf0
lghi $cnt,14
lg $Zlo,8($nlo,$Htbl)
lg $Zhi,0($nlo,$Htbl)
sllg $nlo,$xi,4
nill $xi,0xf0
sllg $rem0,$Zlo,3
nill $nlo,0xf0
srlg $Zlo,$Zlo,4
ngr $rem0,$x78
sllg $tmp,$Zhi,60
xg $Zlo,8($nhi,$Htbl)
srlg $Zhi,$Zhi,4
xgr $Zlo,$tmp
xg $Zhi,0($nhi,$Htbl)
lgr $nhi,$xi
sllg $rem1,$Zlo,3
.Lghash_inner:
srlg $Zlo,$Zlo,4
ngr $rem1,$x78
xg $Zlo,8($nlo,$Htbl)
sllg $tmp,$Zhi,60
xg $Zhi,0($rem0,$rem_4bit)
xgr $Zlo,$tmp
srlg $Zhi,$Zhi,4
llgc $xi,0($cnt,$Xi)
sllg $rem0,$Zlo,3
xg $Zhi,0($nlo,$Htbl)
sllg $nlo,$xi,4
nill $xi,0xf0
nill $nlo,0xf0
srlg $Zlo,$Zlo,4
ngr $rem0,$x78
xg $Zlo,8($nhi,$Htbl)
sllg $tmp,$Zhi,60
xg $Zhi,0($rem1,$rem_4bit)
xgr $Zlo,$tmp
srlg $Zhi,$Zhi,4
sllg $rem1,$Zlo,3
xg $Zhi,0($nhi,$Htbl)
lgr $nhi,$xi
brct $cnt,.Lghash_inner
srlg $Zlo,$Zlo,4
ngr $rem1,$x78
xg $Zlo,8($nlo,$Htbl)
sllg $tmp,$Zhi,60
xg $Zhi,0($rem0,$rem_4bit)
xgr $Zlo,$tmp
srlg $Zhi,$Zhi,4
sllg $rem0,$Zlo,3
xg $Zhi,0($nlo,$Htbl)
srlg $Zlo,$Zlo,4
ngr $rem0,$x78
xg $Zhi,0($rem1,$rem_4bit)
sllg $tmp,$Zhi,60
xg $Zlo,8($nhi,$Htbl)
srlg $Zhi,$Zhi,4
xgr $Zlo,$tmp
xg $Zhi,0($nhi,$Htbl)
la $inp,16($inp)
xg $Zhi,0($rem0,$rem_4bit)
brctg $len,.Louter
stg $Zlo,8+1($Xi)
stg $Zhi,0+1($Xi)
lmg %r6,%r14,48($sp)
br %r14
.type gcm_ghash_4bit,\@function
.size gcm_ghash_4bit,(.-gcm_ghash_4bit)
.align 64
rem_4bit:
.long `0x0000<<16`,0,`0x1C20<<16`,0,`0x3840<<16`,0,`0x2460<<16`,0
.long `0x7080<<16`,0,`0x6CA0<<16`,0,`0x48C0<<16`,0,`0x54E0<<16`,0
.long `0xE100<<16`,0,`0xFD20<<16`,0,`0xD940<<16`,0,`0xC560<<16`,0
.long `0x9180<<16`,0,`0x8DA0<<16`,0,`0xA9C0<<16`,0,`0xB5E0<<16`,0
.type rem_4bit,\@object
.size rem_4bit,(.-rem_4bit)
.string "GHASH for s390x, CRYPTOGAMS by <appro\@openssl.org>"
___
$code =~ s/\`([^\`]*)\`/eval $1/gem;
print $code;
close STDOUT;
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