#!/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/.
# ====================================================================
#
# October 2012
#
# The module implements bn_GF2m_mul_2x2 polynomial multiplication used
# in bn_gf2m.c. It's kind of low-hanging mechanical port from C for
# the time being... Except that it has two code paths: one suitable
# for all SPARCv9 processors and one for VIS3-capable ones. Former
# delivers ~25-45% more, more for longer keys, heaviest DH and DSA
# verify operations on venerable UltraSPARC II. On T4 VIS3 code is
# ~100-230% faster than gcc-generated code and ~35-90% faster than
# the pure SPARCv9 code path.
$locals=16*8;
$tab="%l0";
@T=("%g2","%g3");
@i=("%g4","%g5");
($a1,$a2,$a4,$a8,$a12,$a48)=map("%o$_",(0..5));
($lo,$hi,$b)=("%g1",$a8,"%o7"); $a=$lo;
$code.=<<___;
#include <sparc_arch.h>
#include <openssl/fipssyms.h>
#ifdef __arch64__
.register %g2,#scratch
.register %g3,#scratch
#endif
#ifdef __PIC__
SPARC_PIC_THUNK(%g1)
#endif
.globl bn_GF2m_mul_2x2
.align 16
bn_GF2m_mul_2x2:
SPARC_LOAD_ADDRESS_LEAF(OPENSSL_sparcv9cap_P,%g1,%g5)
ld [%g1+0],%g1 ! OPENSSL_sparcv9cap_P[0]
andcc %g1, SPARCV9_VIS3, %g0
bz,pn %icc,.Lsoftware
nop
sllx %o1, 32, %o1
sllx %o3, 32, %o3
or %o2, %o1, %o1
or %o4, %o3, %o3
.word 0x95b262ab ! xmulx %o1, %o3, %o2
.word 0x99b262cb ! xmulxhi %o1, %o3, %o4
srlx %o2, 32, %o1 ! 13 cycles later
st %o2, [%o0+0]
st %o1, [%o0+4]
srlx %o4, 32, %o3
st %o4, [%o0+8]
retl
st %o3, [%o0+12]
.align 16
.Lsoftware:
save %sp,-STACK_FRAME-$locals,%sp
sllx %i1,32,$a
mov -1,$a12
sllx %i3,32,$b
or %i2,$a,$a
srlx $a12,1,$a48 ! 0x7fff...
or %i4,$b,$b
srlx $a12,2,$a12 ! 0x3fff...
add %sp,STACK_BIAS+STACK_FRAME,$tab
sllx $a,2,$a4
mov $a,$a1
sllx $a,1,$a2
srax $a4,63,@i[1] ! broadcast 61st bit
and $a48,$a4,$a4 ! (a<<2)&0x7fff...
srlx $a48,2,$a48
srax $a2,63,@i[0] ! broadcast 62nd bit
and $a12,$a2,$a2 ! (a<<1)&0x3fff...
srax $a1,63,$lo ! broadcast 63rd bit
and $a48,$a1,$a1 ! (a<<0)&0x1fff...
sllx $a1,3,$a8
and $b,$lo,$lo
and $b,@i[0],@i[0]
and $b,@i[1],@i[1]
stx %g0,[$tab+0*8] ! tab[0]=0
xor $a1,$a2,$a12
stx $a1,[$tab+1*8] ! tab[1]=a1
stx $a2,[$tab+2*8] ! tab[2]=a2
xor $a4,$a8,$a48
stx $a12,[$tab+3*8] ! tab[3]=a1^a2
xor $a4,$a1,$a1
stx $a4,[$tab+4*8] ! tab[4]=a4
xor $a4,$a2,$a2
stx $a1,[$tab+5*8] ! tab[5]=a1^a4
xor $a4,$a12,$a12
stx $a2,[$tab+6*8] ! tab[6]=a2^a4
xor $a48,$a1,$a1
stx $a12,[$tab+7*8] ! tab[7]=a1^a2^a4
xor $a48,$a2,$a2
stx $a8,[$tab+8*8] ! tab[8]=a8
xor $a48,$a12,$a12
stx $a1,[$tab+9*8] ! tab[9]=a1^a8
xor $a4,$a1,$a1
stx $a2,[$tab+10*8] ! tab[10]=a2^a8
xor $a4,$a2,$a2
stx $a12,[$tab+11*8] ! tab[11]=a1^a2^a8
xor $a4,$a12,$a12
stx $a48,[$tab+12*8] ! tab[12]=a4^a8
srlx $lo,1,$hi
stx $a1,[$tab+13*8] ! tab[13]=a1^a4^a8
sllx $lo,63,$lo
stx $a2,[$tab+14*8] ! tab[14]=a2^a4^a8
srlx @i[0],2,@T[0]
stx $a12,[$tab+15*8] ! tab[15]=a1^a2^a4^a8
sllx @i[0],62,$a1
sllx $b,3,@i[0]
srlx @i[1],3,@T[1]
and @i[0],`0xf<<3`,@i[0]
sllx @i[1],61,$a2
ldx [$tab+@i[0]],@i[0]
srlx $b,4-3,@i[1]
xor @T[0],$hi,$hi
and @i[1],`0xf<<3`,@i[1]
xor $a1,$lo,$lo
ldx [$tab+@i[1]],@i[1]
xor @T[1],$hi,$hi
xor @i[0],$lo,$lo
srlx $b,8-3,@i[0]
xor $a2,$lo,$lo
and @i[0],`0xf<<3`,@i[0]
___
for($n=1;$n<14;$n++) {
$code.=<<___;
sllx @i[1],`$n*4`,@T[0]
ldx [$tab+@i[0]],@i[0]
srlx @i[1],`64-$n*4`,@T[1]
xor @T[0],$lo,$lo
srlx $b,`($n+2)*4`-3,@i[1]
xor @T[1],$hi,$hi
and @i[1],`0xf<<3`,@i[1]
___
push(@i,shift(@i)); push(@T,shift(@T));
}
$code.=<<___;
sllx @i[1],`$n*4`,@T[0]
ldx [$tab+@i[0]],@i[0]
srlx @i[1],`64-$n*4`,@T[1]
xor @T[0],$lo,$lo
sllx @i[0],`($n+1)*4`,@T[0]
xor @T[1],$hi,$hi
srlx @i[0],`64-($n+1)*4`,@T[1]
xor @T[0],$lo,$lo
xor @T[1],$hi,$hi
srlx $lo,32,%i1
st $lo,[%i0+0]
st %i1,[%i0+4]
srlx $hi,32,%i2
st $hi,[%i0+8]
st %i2,[%i0+12]
ret
restore
.type bn_GF2m_mul_2x2,#function
.size bn_GF2m_mul_2x2,.-bn_GF2m_mul_2x2
.asciz "GF(2^m) Multiplication for SPARCv9, CRYPTOGAMS by <appro\@openssl.org>"
.align 4
___
$code =~ s/\`([^\`]*)\`/eval($1)/gem;
print $code;
close STDOUT;