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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/.
# ====================================================================
#
# GHASH for ARMv8 Crypto Extension, 64-bit polynomial multiplication.
#
# June 2014
#
# Initial version was developed in tight cooperation with Ard
# Biesheuvel <ard.biesheuvel@linaro.org> from bits-n-pieces from
# other assembly modules. Just like aesv8-armx.pl this module
# supports both AArch32 and AArch64 execution modes.
#
# Current performance in cycles per processed byte:
#
# PMULL[2] 32-bit NEON(*)
# Apple A7 1.76 5.62
# Cortex-A53 1.45 8.39
# Cortex-A57 2.22 7.61
#
# (*) presented for reference/comparison purposes;
$flavour = shift;
open STDOUT,">".shift;
$Xi="x0"; # argument block
$Htbl="x1";
$inp="x2";
$len="x3";
$inc="x12";
{
my ($Xl,$Xm,$Xh,$IN)=map("q$_",(0..3));
my ($t0,$t1,$t2,$t3,$H,$Hhl)=map("q$_",(8..14));
$code=<<___;
#include "arm_arch.h"
.text
___
$code.=<<___ if ($flavour =~ /64/);
#ifdef __clang__
.arch armv8-a
.arch_extension crypto
#else
.arch armv8-a+crypto
#endif
___
$code.=".fpu neon\n.code 32\n" if ($flavour !~ /64/);
$code.=<<___;
.global gcm_init_v8
.type gcm_init_v8,%function
.align 4
gcm_init_v8:
vld1.64 {$t1},[x1] @ load H
vmov.i8 $t0,#0xe1
vext.8 $IN,$t1,$t1,#8
vshl.i64 $t0,$t0,#57
vshr.u64 $t2,$t0,#63
vext.8 $t0,$t2,$t0,#8 @ t0=0xc2....01
vdup.32 $t1,${t1}[1]
vshr.u64 $t3,$IN,#63
vshr.s32 $t1,$t1,#31 @ broadcast carry bit
vand $t3,$t3,$t0
vshl.i64 $IN,$IN,#1
vext.8 $t3,$t3,$t3,#8
vand $t0,$t0,$t1
vorr $IN,$IN,$t3 @ H<<<=1
veor $IN,$IN,$t0 @ twisted H
vst1.64 {$IN},[x0]
ret
.size gcm_init_v8,.-gcm_init_v8
.global gcm_gmult_v8
.type gcm_gmult_v8,%function
.align 4
gcm_gmult_v8:
vld1.64 {$t1},[$Xi] @ load Xi
vmov.i8 $t3,#0xe1
vld1.64 {$H},[$Htbl] @ load twisted H
vshl.u64 $t3,$t3,#57
#ifndef __ARMEB__
vrev64.8 $t1,$t1
#endif
vext.8 $Hhl,$H,$H,#8
mov $len,#0
vext.8 $IN,$t1,$t1,#8
mov $inc,#0
veor $Hhl,$Hhl,$H @ Karatsuba pre-processing
mov $inp,$Xi
b .Lgmult_v8
.size gcm_gmult_v8,.-gcm_gmult_v8
.global gcm_ghash_v8
.type gcm_ghash_v8,%function
.align 4
gcm_ghash_v8:
vld1.64 {$Xl},[$Xi] @ load [rotated] Xi
subs $len,$len,#16
vmov.i8 $t3,#0xe1
mov $inc,#16
vld1.64 {$H},[$Htbl] @ load twisted H
cclr $inc,eq
vext.8 $Xl,$Xl,$Xl,#8
vshl.u64 $t3,$t3,#57
vld1.64 {$t1},[$inp],$inc @ load [rotated] inp
vext.8 $Hhl,$H,$H,#8
#ifndef __ARMEB__
vrev64.8 $Xl,$Xl
vrev64.8 $t1,$t1
#endif
veor $Hhl,$Hhl,$H @ Karatsuba pre-processing
vext.8 $IN,$t1,$t1,#8
b .Loop_v8
.align 4
.Loop_v8:
vext.8 $t2,$Xl,$Xl,#8
veor $IN,$IN,$Xl @ inp^=Xi
veor $t1,$t1,$t2 @ $t1 is rotated inp^Xi
.Lgmult_v8:
vpmull.p64 $Xl,$H,$IN @ H.lo·Xi.lo
veor $t1,$t1,$IN @ Karatsuba pre-processing
vpmull2.p64 $Xh,$H,$IN @ H.hi·Xi.hi
subs $len,$len,#16
vpmull.p64 $Xm,$Hhl,$t1 @ (H.lo+H.hi)·(Xi.lo+Xi.hi)
cclr $inc,eq
vext.8 $t1,$Xl,$Xh,#8 @ Karatsuba post-processing
veor $t2,$Xl,$Xh
veor $Xm,$Xm,$t1
vld1.64 {$t1},[$inp],$inc @ load [rotated] inp
veor $Xm,$Xm,$t2
vpmull.p64 $t2,$Xl,$t3 @ 1st phase
vmov $Xh#lo,$Xm#hi @ Xh|Xm - 256-bit result
vmov $Xm#hi,$Xl#lo @ Xm is rotated Xl
#ifndef __ARMEB__
vrev64.8 $t1,$t1
#endif
veor $Xl,$Xm,$t2
vext.8 $IN,$t1,$t1,#8
vext.8 $t2,$Xl,$Xl,#8 @ 2nd phase
vpmull.p64 $Xl,$Xl,$t3
veor $t2,$t2,$Xh
veor $Xl,$Xl,$t2
b.hs .Loop_v8
#ifndef __ARMEB__
vrev64.8 $Xl,$Xl
#endif
vext.8 $Xl,$Xl,$Xl,#8
vst1.64 {$Xl},[$Xi] @ write out Xi
ret
.size gcm_ghash_v8,.-gcm_ghash_v8
___
}
$code.=<<___;
.asciz "GHASH for ARMv8, CRYPTOGAMS by <appro\@openssl.org>"
.align 2
___
if ($flavour =~ /64/) { ######## 64-bit code
sub unvmov {
my $arg=shift;
$arg =~ m/q([0-9]+)#(lo|hi),\s*q([0-9]+)#(lo|hi)/o &&
sprintf "ins v%d.d[%d],v%d.d[%d]",$1,($2 eq "lo")?0:1,$3,($4 eq "lo")?0:1;
}
foreach(split("\n",$code)) {
s/cclr\s+([wx])([^,]+),\s*([a-z]+)/csel $1$2,$1zr,$1$2,$3/o or
s/vmov\.i8/movi/o or # fix up legacy mnemonics
s/vmov\s+(.*)/unvmov($1)/geo or
s/vext\.8/ext/o or
s/vshr\.s/sshr\.s/o or
s/vshr/ushr/o or
s/^(\s+)v/$1/o or # strip off v prefix
s/\bbx\s+lr\b/ret/o;
s/\bq([0-9]+)\b/"v".($1<8?$1:$1+8).".16b"/geo; # old->new registers
s/@\s/\/\//o; # old->new style commentary
# fix up remainig legacy suffixes
s/\.[ui]?8(\s)/$1/o;
s/\.[uis]?32//o and s/\.16b/\.4s/go;
m/\.p64/o and s/\.16b/\.1q/o; # 1st pmull argument
m/l\.p64/o and s/\.16b/\.1d/go; # 2nd and 3rd pmull arguments
s/\.[uisp]?64//o and s/\.16b/\.2d/go;
s/\.[42]([sd])\[([0-3])\]/\.$1\[$2\]/o;
print $_,"\n";
}
} else { ######## 32-bit code
sub unvdup32 {
my $arg=shift;
$arg =~ m/q([0-9]+),\s*q([0-9]+)\[([0-3])\]/o &&
sprintf "vdup.32 q%d,d%d[%d]",$1,2*$2+($3>>1),$3&1;
}
sub unvpmullp64 {
my ($mnemonic,$arg)=@_;
if ($arg =~ m/q([0-9]+),\s*q([0-9]+),\s*q([0-9]+)/o) {
my $word = 0xf2a00e00|(($1&7)<<13)|(($1&8)<<19)
|(($2&7)<<17)|(($2&8)<<4)
|(($3&7)<<1) |(($3&8)<<2);
$word |= 0x00010001 if ($mnemonic =~ "2");
# since ARMv7 instructions are always encoded little-endian.
# correct solution is to use .inst directive, but older
# assemblers don't implement it:-(
sprintf ".byte\t0x%02x,0x%02x,0x%02x,0x%02x\t@ %s %s",
$word&0xff,($word>>8)&0xff,
($word>>16)&0xff,($word>>24)&0xff,
$mnemonic,$arg;
}
}
foreach(split("\n",$code)) {
s/\b[wx]([0-9]+)\b/r$1/go; # new->old registers
s/\bv([0-9])\.[12468]+[bsd]\b/q$1/go; # new->old registers
s/\/\/\s?/@ /o; # new->old style commentary
# fix up remainig new-style suffixes
s/\],#[0-9]+/]!/o;
s/cclr\s+([^,]+),\s*([a-z]+)/mov$2 $1,#0/o or
s/vdup\.32\s+(.*)/unvdup32($1)/geo or
s/v?(pmull2?)\.p64\s+(.*)/unvpmullp64($1,$2)/geo or
s/\bq([0-9]+)#(lo|hi)/sprintf "d%d",2*$1+($2 eq "hi")/geo or
s/^(\s+)b\./$1b/o or
s/^(\s+)ret/$1bx\tlr/o;
print $_,"\n";
}
}
close STDOUT; # enforce flush
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