--- /dev/null
+#! /usr/bin/env perl
+# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License"). You may not use
+# this file except in compliance with the License. You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+#
+# ====================================================================
+# 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/.
+# ====================================================================
+#
+# December 2015
+#
+# ChaCha20 for s390x.
+#
+# 3 times faster than compiler-generated code.
+
+$flavour = shift;
+
+if ($flavour =~ /3[12]/) {
+ $SIZE_T=4;
+ $g="";
+} else {
+ $SIZE_T=8;
+ $g="g";
+}
+
+while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {}
+open STDOUT,">$output";
+
+sub AUTOLOAD() # thunk [simplified] x86-style perlasm
+{ my $opcode = $AUTOLOAD; $opcode =~ s/.*:://;
+ $code .= "\t$opcode\t".join(',',@_)."\n";
+}
+
+my $sp="%r15";
+
+my $stdframe=16*$SIZE_T+4*8;
+my $frame=$stdframe+4*20;
+
+my ($out,$inp,$len,$key,$counter)=map("%r$_",(2..6));
+
+my @x=map("%r$_",(0..7,"x","x","x","x",(10..13)));
+my @t=map("%r$_",(8,9));
+
+sub ROUND {
+my ($a0,$b0,$c0,$d0)=@_;
+my ($a1,$b1,$c1,$d1)=map(($_&~3)+(($_+1)&3),($a0,$b0,$c0,$d0));
+my ($a2,$b2,$c2,$d2)=map(($_&~3)+(($_+1)&3),($a1,$b1,$c1,$d1));
+my ($a3,$b3,$c3,$d3)=map(($_&~3)+(($_+1)&3),($a2,$b2,$c2,$d2));
+my ($xc,$xc_)=map("\"$_\"",@t);
+my @x=map("\"$_\"",@x);
+
+ # Consider order in which variables are addressed by their
+ # index:
+ #
+ # a b c d
+ #
+ # 0 4 8 12 < even round
+ # 1 5 9 13
+ # 2 6 10 14
+ # 3 7 11 15
+ # 0 5 10 15 < odd round
+ # 1 6 11 12
+ # 2 7 8 13
+ # 3 4 9 14
+ #
+ # 'a', 'b' and 'd's are permanently allocated in registers,
+ # @x[0..7,12..15], while 'c's are maintained in memory. If
+ # you observe 'c' column, you'll notice that pair of 'c's is
+ # invariant between rounds. This means that we have to reload
+ # them once per round, in the middle. This is why you'll see
+ # 'c' stores and loads in the middle, but none in the beginning
+ # or end.
+
+ (
+ "&alr (@x[$a0],@x[$b0])", # Q1
+ "&alr (@x[$a1],@x[$b1])", # Q2
+ "&xr (@x[$d0],@x[$a0])",
+ "&xr (@x[$d1],@x[$a1])",
+ "&rll (@x[$d0],@x[$d0],16)",
+ "&rll (@x[$d1],@x[$d1],16)",
+
+ "&alr ($xc,@x[$d0])",
+ "&alr ($xc_,@x[$d1])",
+ "&xr (@x[$b0],$xc)",
+ "&xr (@x[$b1],$xc_)",
+ "&rll (@x[$b0],@x[$b0],12)",
+ "&rll (@x[$b1],@x[$b1],12)",
+
+ "&alr (@x[$a0],@x[$b0])",
+ "&alr (@x[$a1],@x[$b1])",
+ "&xr (@x[$d0],@x[$a0])",
+ "&xr (@x[$d1],@x[$a1])",
+ "&rll (@x[$d0],@x[$d0],8)",
+ "&rll (@x[$d1],@x[$d1],8)",
+
+ "&alr ($xc,@x[$d0])",
+ "&alr ($xc_,@x[$d1])",
+ "&xr (@x[$b0],$xc)",
+ "&xr (@x[$b1],$xc_)",
+ "&rll (@x[$b0],@x[$b0],7)",
+ "&rll (@x[$b1],@x[$b1],7)",
+
+ "&stm ($xc,$xc_,'$stdframe+4*8+4*$c0($sp)')", # reload pair of 'c's
+ "&lm ($xc,$xc_,'$stdframe+4*8+4*$c2($sp)')",
+
+ "&alr (@x[$a2],@x[$b2])", # Q3
+ "&alr (@x[$a3],@x[$b3])", # Q4
+ "&xr (@x[$d2],@x[$a2])",
+ "&xr (@x[$d3],@x[$a3])",
+ "&rll (@x[$d2],@x[$d2],16)",
+ "&rll (@x[$d3],@x[$d3],16)",
+
+ "&alr ($xc,@x[$d2])",
+ "&alr ($xc_,@x[$d3])",
+ "&xr (@x[$b2],$xc)",
+ "&xr (@x[$b3],$xc_)",
+ "&rll (@x[$b2],@x[$b2],12)",
+ "&rll (@x[$b3],@x[$b3],12)",
+
+ "&alr (@x[$a2],@x[$b2])",
+ "&alr (@x[$a3],@x[$b3])",
+ "&xr (@x[$d2],@x[$a2])",
+ "&xr (@x[$d3],@x[$a3])",
+ "&rll (@x[$d2],@x[$d2],8)",
+ "&rll (@x[$d3],@x[$d3],8)",
+
+ "&alr ($xc,@x[$d2])",
+ "&alr ($xc_,@x[$d3])",
+ "&xr (@x[$b2],$xc)",
+ "&xr (@x[$b3],$xc_)",
+ "&rll (@x[$b2],@x[$b2],7)",
+ "&rll (@x[$b3],@x[$b3],7)"
+ );
+}
+
+$code.=<<___;
+.text
+
+.globl ChaCha20_ctr32
+.type ChaCha20_ctr32,\@function
+.align 32
+ChaCha20_ctr32:
+ lt${g}r $len,$len # $len==0?
+ bzr %r14
+ a${g}hi $len,-64
+ l${g}hi %r1,-$frame
+ stm${g} %r6,%r15,`6*$SIZE_T`($sp)
+ sl${g}r $out,$inp # difference
+ la $len,0($inp,$len) # end of input minus 64
+ larl %r7,.Lsigma
+ lgr %r0,$sp
+ la $sp,0(%r1,$sp)
+ st${g} %r0,0($sp)
+
+ lmg %r8,%r11,0($key) # load key
+ lmg %r12,%r13,0($counter) # load counter
+ lmg %r6,%r7,0(%r7) # load sigma constant
+
+ la %r14,0($inp)
+ st${g} $out,$frame+3*$SIZE_T($sp)
+ st${g} $len,$frame+4*$SIZE_T($sp)
+ stmg %r6,%r13,$stdframe($sp) # copy key schedule to stack
+ srlg @x[12],%r12,32 # 32-bit counter value
+ j .Loop_outer
+
+.align 16
+.Loop_outer:
+ lm @x[0],@x[7],$stdframe+4*0($sp) # load x[0]-x[7]
+ lm @t[0],@t[1],$stdframe+4*10($sp) # load x[10]-x[11]
+ lm @x[13],@x[15],$stdframe+4*13($sp) # load x[13]-x[15]
+ stm @t[0],@t[1],$stdframe+4*8+4*10($sp) # offload x[10]-x[11]
+ lm @t[0],@t[1],$stdframe+4*8($sp) # load x[8]-x[9]
+ st @x[12],$stdframe+4*12($sp) # save counter
+ st${g} %r14,$frame+2*$SIZE_T($sp) # save input pointer
+ lhi %r14,10
+ j .Loop
+
+.align 4
+.Loop:
+___
+ foreach (&ROUND(0, 4, 8,12)) { eval; }
+ foreach (&ROUND(0, 5,10,15)) { eval; }
+$code.=<<___;
+ brct %r14,.Loop
+
+ l${g} %r14,$frame+2*$SIZE_T($sp) # pull input pointer
+ stm @t[0],@t[1],$stdframe+4*8+4*8($sp) # offload x[8]-x[9]
+ lm${g} @t[0],@t[1],$frame+3*$SIZE_T($sp)
+
+ al @x[0],$stdframe+4*0($sp) # accumulate key schedule
+ al @x[1],$stdframe+4*1($sp)
+ al @x[2],$stdframe+4*2($sp)
+ al @x[3],$stdframe+4*3($sp)
+ al @x[4],$stdframe+4*4($sp)
+ al @x[5],$stdframe+4*5($sp)
+ al @x[6],$stdframe+4*6($sp)
+ al @x[7],$stdframe+4*7($sp)
+ lrvr @x[0],@x[0]
+ lrvr @x[1],@x[1]
+ lrvr @x[2],@x[2]
+ lrvr @x[3],@x[3]
+ lrvr @x[4],@x[4]
+ lrvr @x[5],@x[5]
+ lrvr @x[6],@x[6]
+ lrvr @x[7],@x[7]
+ al @x[12],$stdframe+4*12($sp)
+ al @x[13],$stdframe+4*13($sp)
+ al @x[14],$stdframe+4*14($sp)
+ al @x[15],$stdframe+4*15($sp)
+ lrvr @x[12],@x[12]
+ lrvr @x[13],@x[13]
+ lrvr @x[14],@x[14]
+ lrvr @x[15],@x[15]
+
+ la @t[0],0(@t[0],%r14) # reconstruct output pointer
+ cl${g}r %r14,@t[1]
+ jh .Ltail
+
+ x @x[0],4*0(%r14) # xor with input
+ x @x[1],4*1(%r14)
+ st @x[0],4*0(@t[0]) # store output
+ x @x[2],4*2(%r14)
+ st @x[1],4*1(@t[0])
+ x @x[3],4*3(%r14)
+ st @x[2],4*2(@t[0])
+ x @x[4],4*4(%r14)
+ st @x[3],4*3(@t[0])
+ lm @x[0],@x[3],$stdframe+4*8+4*8($sp) # load x[8]-x[11]
+ x @x[5],4*5(%r14)
+ st @x[4],4*4(@t[0])
+ x @x[6],4*6(%r14)
+ al @x[0],$stdframe+4*8($sp)
+ st @x[5],4*5(@t[0])
+ x @x[7],4*7(%r14)
+ al @x[1],$stdframe+4*9($sp)
+ st @x[6],4*6(@t[0])
+ x @x[12],4*12(%r14)
+ al @x[2],$stdframe+4*10($sp)
+ st @x[7],4*7(@t[0])
+ x @x[13],4*13(%r14)
+ al @x[3],$stdframe+4*11($sp)
+ st @x[12],4*12(@t[0])
+ x @x[14],4*14(%r14)
+ st @x[13],4*13(@t[0])
+ x @x[15],4*15(%r14)
+ st @x[14],4*14(@t[0])
+ lrvr @x[0],@x[0]
+ st @x[15],4*15(@t[0])
+ lrvr @x[1],@x[1]
+ lrvr @x[2],@x[2]
+ lrvr @x[3],@x[3]
+ lhi @x[12],1
+ x @x[0],4*8(%r14)
+ al @x[12],$stdframe+4*12($sp) # increment counter
+ x @x[1],4*9(%r14)
+ st @x[0],4*8(@t[0])
+ x @x[2],4*10(%r14)
+ st @x[1],4*9(@t[0])
+ x @x[3],4*11(%r14)
+ st @x[2],4*10(@t[0])
+ st @x[3],4*11(@t[0])
+
+ cl${g}r %r14,@t[1] # done yet?
+ la %r14,64(%r14)
+ jl .Loop_outer
+
+.Ldone:
+ xgr %r0,%r0
+ xgr %r1,%r1
+ xgr %r2,%r2
+ xgr %r3,%r3
+ stmg %r0,%r3,$stdframe+4*4($sp) # wipe key copy
+ stmg %r0,%r3,$stdframe+4*12($sp)
+
+ lm${g} %r6,%r15,`$frame+6*$SIZE_T`($sp)
+ br %r14
+
+.align 16
+.Ltail:
+ la @t[1],64($t[1])
+ stm @x[0],@x[7],$stdframe+4*0($sp)
+ sl${g}r @t[1],%r14
+ lm @x[0],@x[3],$stdframe+4*8+4*8($sp)
+ l${g}hi @x[6],0
+ stm @x[12],@x[15],$stdframe+4*12($sp)
+ al @x[0],$stdframe+4*8($sp)
+ al @x[1],$stdframe+4*9($sp)
+ al @x[2],$stdframe+4*10($sp)
+ al @x[3],$stdframe+4*11($sp)
+ lrvr @x[0],@x[0]
+ lrvr @x[1],@x[1]
+ lrvr @x[2],@x[2]
+ lrvr @x[3],@x[3]
+ stm @x[0],@x[3],$stdframe+4*8($sp)
+
+.Loop_tail:
+ llgc @x[4],0(@x[6],%r14)
+ llgc @x[5],$stdframe(@x[6],$sp)
+ xr @x[5],@x[4]
+ stc @x[5],0(@x[6],@t[0])
+ la @x[6],1(@x[6])
+ brct @t[1],.Loop_tail
+
+ j .Ldone
+.size ChaCha20_ctr32,.-ChaCha20_ctr32
+
+.align 32
+.Lsigma:
+.long 0x61707865,0x3320646e,0x79622d32,0x6b206574 # endian-neutral
+.asciz "ChaCha20 for s390x, CRYPTOGAMS by <appro\@openssl.org>"
+.align 4
+___
+
+foreach (split("\n",$code)) {
+ s/\`([^\`]*)\`/eval $1/ge;
+
+ print $_,"\n";
+}
+close STDOUT;
projects / cassiopeia.git / blobdiff