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#!/usr/bin/env perl
# ====================================================================
# Written by Andy Polyakov <appro@fy.chalmers.se> 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/.
# ====================================================================
# SHA1 block procedure for s390x.
# April 2007.
#
# Performance is >30% better than gcc 3.3 generated code. But the real
# twist is that SHA1 hardware support is detected and utilized. In
# which case performance can reach further >4.5x for larger chunks.
# January 2009.
#
# Optimize Xupdate for amount of memory references and reschedule
# instructions to favour dual-issue z10 pipeline. On z10 hardware is
# "only" ~2.3x faster than software.
# November 2010.
#
# Adapt for -m31 build. If kernel supports what's called "highgprs"
# feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
# instructions and achieve "64-bit" performance even in 31-bit legacy
# application context. The feature is not specific to any particular
# processor, as long as it's "z-CPU". Latter implies that the code
# remains z/Architecture specific.
$kimdfunc=1; # magic function code for kimd instruction
$flavour = shift;
if ($flavour =~ /3[12]/) {
$SIZE_T=4;
$g="";
} else {
$SIZE_T=8;
$g="g";
}
while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
open STDOUT,">$output";
$K_00_39="%r0"; $K=$K_00_39;
$K_40_79="%r1";
$ctx="%r2"; $prefetch="%r2";
$inp="%r3";
$len="%r4";
$A="%r5";
$B="%r6";
$C="%r7";
$D="%r8";
$E="%r9"; @V=($A,$B,$C,$D,$E);
$t0="%r10";
$t1="%r11";
@X=("%r12","%r13","%r14");
$sp="%r15";
$stdframe=16*$SIZE_T+4*8;
$frame=$stdframe+16*4;
sub Xupdate {
my $i=shift;
$code.=<<___ if ($i==15);
lg $prefetch,$stdframe($sp) ### Xupdate(16) warm-up
lr $X[0],$X[2]
___
return if ($i&1); # Xupdate is vectorized and executed every 2nd cycle
$code.=<<___ if ($i<16);
lg $X[0],`$i*4`($inp) ### Xload($i)
rllg $X[1],$X[0],32
___
$code.=<<___ if ($i>=16);
xgr $X[0],$prefetch ### Xupdate($i)
lg $prefetch,`$stdframe+4*(($i+2)%16)`($sp)
xg $X[0],`$stdframe+4*(($i+8)%16)`($sp)
xgr $X[0],$prefetch
rll $X[0],$X[0],1
rllg $X[1],$X[0],32
rll $X[1],$X[1],1
rllg $X[0],$X[1],32
lr $X[2],$X[1] # feedback
___
$code.=<<___ if ($i<=70);
stg $X[0],`$stdframe+4*($i%16)`($sp)
___
unshift(@X,pop(@X));
}
sub BODY_00_19 {
my ($i,$a,$b,$c,$d,$e)=@_;
my $xi=$X[1];
&Xupdate($i);
$code.=<<___;
alr $e,$K ### $i
rll $t1,$a,5
lr $t0,$d
xr $t0,$c
alr $e,$t1
nr $t0,$b
alr $e,$xi
xr $t0,$d
rll $b,$b,30
alr $e,$t0
___
}
sub BODY_20_39 {
my ($i,$a,$b,$c,$d,$e)=@_;
my $xi=$X[1];
&Xupdate($i);
$code.=<<___;
alr $e,$K ### $i
rll $t1,$a,5
lr $t0,$b
alr $e,$t1
xr $t0,$c
alr $e,$xi
xr $t0,$d
rll $b,$b,30
alr $e,$t0
___
}
sub BODY_40_59 {
my ($i,$a,$b,$c,$d,$e)=@_;
my $xi=$X[1];
&Xupdate($i);
$code.=<<___;
alr $e,$K ### $i
rll $t1,$a,5
lr $t0,$b
alr $e,$t1
or $t0,$c
lr $t1,$b
nr $t0,$d
nr $t1,$c
alr $e,$xi
or $t0,$t1
rll $b,$b,30
alr $e,$t0
___
}
$code.=<<___;
.text
.align 64
.type Ktable,\@object
Ktable: .long 0x5a827999,0x6ed9eba1,0x8f1bbcdc,0xca62c1d6
.skip 48 #.long 0,0,0,0,0,0,0,0,0,0,0,0
.size Ktable,.-Ktable
.globl sha1_block_data_order
.type sha1_block_data_order,\@function
sha1_block_data_order:
___
$code.=<<___ if ($kimdfunc);
larl %r1,OPENSSL_s390xcap_P
lg %r0,0(%r1)
tmhl %r0,0x4000 # check for message-security assist
jz .Lsoftware
lghi %r0,0
la %r1,`2*$SIZE_T`($sp)
.long 0xb93e0002 # kimd %r0,%r2
lg %r0,`2*$SIZE_T`($sp)
tmhh %r0,`0x8000>>$kimdfunc`
jz .Lsoftware
lghi %r0,$kimdfunc
lgr %r1,$ctx
lgr %r2,$inp
sllg %r3,$len,6
.long 0xb93e0002 # kimd %r0,%r2
brc 1,.-4 # pay attention to "partial completion"
br %r14
.align 16
.Lsoftware:
___
$code.=<<___;
lghi %r1,-$frame
st${g} $ctx,`2*$SIZE_T`($sp)
stm${g} %r6,%r15,`6*$SIZE_T`($sp)
lgr %r0,$sp
la $sp,0(%r1,$sp)
st${g} %r0,0($sp)
larl $t0,Ktable
llgf $A,0($ctx)
llgf $B,4($ctx)
llgf $C,8($ctx)
llgf $D,12($ctx)
llgf $E,16($ctx)
lg $K_00_39,0($t0)
lg $K_40_79,8($t0)
.Lloop:
rllg $K_00_39,$K_00_39,32
___
for ($i=0;$i<20;$i++) { &BODY_00_19($i,@V); unshift(@V,pop(@V)); }
$code.=<<___;
rllg $K_00_39,$K_00_39,32
___
for (;$i<40;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
$code.=<<___; $K=$K_40_79;
rllg $K_40_79,$K_40_79,32
___
for (;$i<60;$i++) { &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
$code.=<<___;
rllg $K_40_79,$K_40_79,32
___
for (;$i<80;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
$code.=<<___;
l${g} $ctx,`$frame+2*$SIZE_T`($sp)
la $inp,64($inp)
al $A,0($ctx)
al $B,4($ctx)
al $C,8($ctx)
al $D,12($ctx)
al $E,16($ctx)
st $A,0($ctx)
st $B,4($ctx)
st $C,8($ctx)
st $D,12($ctx)
st $E,16($ctx)
brct${g} $len,.Lloop
lm${g} %r6,%r15,`$frame+6*$SIZE_T`($sp)
br %r14
.size sha1_block_data_order,.-sha1_block_data_order
.string "SHA1 block transform for s390x, CRYPTOGAMS by <appro\@openssl.org>"
.comm OPENSSL_s390xcap_P,16,8
___
$code =~ s/\`([^\`]*)\`/eval $1/gem;
print $code;
close STDOUT;
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