[thirdparty/openssl.git] / crypto / sha / asm / sha512-armv8.pl

#!/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/.
# ====================================================================
#
# SHA256/512 for ARMv8.
#
# Performance in cycles per processed byte and improvement coefficient
# over code generated with "default" compiler:
#
#		SHA256-hw	SHA256(*)	SHA512
# Apple A7	1.97		10.5 (+33%)	6.73 (-1%(**))
# Cortex-A53	2.38		15.6 (+110%)	10.1 (+190%(***))
# Cortex-A57	2.31		11.6 (+86%)	7.51 (+260%(***))
# 
# (*)	Software SHA256 results are of lesser relevance, presented
#	mostly for informational purposes.
# (**)	The result is a trade-off: it's possible to improve it by
#	10% (or by 1 cycle per round), but at the cost of 20% loss
#	on Cortex-A53 (or by 4 cycles per round).
# (***)	Super-impressive coefficients over gcc-generated code are
#	indication of some compiler "pathology", most notably code
#	generated with -mgeneral-regs-only is significanty faster
#	and lags behind assembly only by 50-90%.

$flavour=shift;
$output=shift;

$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
die "can't locate arm-xlate.pl";

open OUT,"| \"$^X\" $xlate $flavour $output";
*STDOUT=*OUT;

if ($output =~ /512/) {
	$BITS=512;
	$SZ=8;
	@Sigma0=(28,34,39);
	@Sigma1=(14,18,41);
	@sigma0=(1,  8, 7);
	@sigma1=(19,61, 6);
	$rounds=80;
	$reg_t="x";
} else {
	$BITS=256;
	$SZ=4;
	@Sigma0=( 2,13,22);
	@Sigma1=( 6,11,25);
	@sigma0=( 7,18, 3);
	@sigma1=(17,19,10);
	$rounds=64;
	$reg_t="w";
}

$func="sha${BITS}_block_data_order";

($ctx,$inp,$num,$Ktbl)=map("x$_",(0..2,30));

@X=map("$reg_t$_",(3..15,0..2));
@V=($A,$B,$C,$D,$E,$F,$G,$H)=map("$reg_t$_",(20..27));
($t0,$t1,$t2,$t3)=map("$reg_t$_",(16,17,19,28));

sub BODY_00_xx {
my ($i,$a,$b,$c,$d,$e,$f,$g,$h)=@_;
my $j=($i+1)&15;
my ($T0,$T1,$T2)=(@X[($i-8)&15],@X[($i-9)&15],@X[($i-10)&15]);
   $T0=@X[$i+3] if ($i<11);

$code.=<<___	if ($i<16);
#ifndef	__ARMEB__
	rev	@X[$i],@X[$i]			// $i
#endif
___
$code.=<<___	if ($i<13 && ($i&1));
	ldp	@X[$i+1],@X[$i+2],[$inp],#2*$SZ
___
$code.=<<___	if ($i==13);
	ldp	@X[14],@X[15],[$inp]
___
$code.=<<___	if ($i>=14);
	ldr	@X[($i-11)&15],[sp,#`$SZ*(($i-11)%4)`]
___
$code.=<<___	if ($i>0 && $i<16);
	add	$a,$a,$t1			// h+=Sigma0(a)
___
$code.=<<___	if ($i>=11);
	str	@X[($i-8)&15],[sp,#`$SZ*(($i-8)%4)`]
___
# While ARMv8 specifies merged rotate-n-logical operation such as
# 'eor x,y,z,ror#n', it was found to negatively affect performance
# on Apple A7. The reason seems to be that it requires even 'y' to
# be available earlier. This means that such merged instruction is
# not necessarily best choice on critical path... On the other hand
# Cortex-A5x handles merged instructions much better than disjoint
# rotate and logical... See (**) footnote above.
$code.=<<___	if ($i<15);
	ror	$t0,$e,#$Sigma1[0]
	add	$h,$h,$t2			// h+=K[i]
	eor	$T0,$e,$e,ror#`$Sigma1[2]-$Sigma1[1]`
	and	$t1,$f,$e
	bic	$t2,$g,$e
	add	$h,$h,@X[$i&15]			// h+=X[i]
	orr	$t1,$t1,$t2			// Ch(e,f,g)
	eor	$t2,$a,$b			// a^b, b^c in next round
	eor	$t0,$t0,$T0,ror#$Sigma1[1]	// Sigma1(e)
	ror	$T0,$a,#$Sigma0[0]
	add	$h,$h,$t1			// h+=Ch(e,f,g)
	eor	$t1,$a,$a,ror#`$Sigma0[2]-$Sigma0[1]`
	add	$h,$h,$t0			// h+=Sigma1(e)
	and	$t3,$t3,$t2			// (b^c)&=(a^b)
	add	$d,$d,$h			// d+=h
	eor	$t3,$t3,$b			// Maj(a,b,c)
	eor	$t1,$T0,$t1,ror#$Sigma0[1]	// Sigma0(a)
	add	$h,$h,$t3			// h+=Maj(a,b,c)
	ldr	$t3,[$Ktbl],#$SZ		// *K++, $t2 in next round
	//add	$h,$h,$t1			// h+=Sigma0(a)
___
$code.=<<___	if ($i>=15);
	ror	$t0,$e,#$Sigma1[0]
	add	$h,$h,$t2			// h+=K[i]
	ror	$T1,@X[($j+1)&15],#$sigma0[0]
	and	$t1,$f,$e
	ror	$T2,@X[($j+14)&15],#$sigma1[0]
	bic	$t2,$g,$e
	ror	$T0,$a,#$Sigma0[0]
	add	$h,$h,@X[$i&15]			// h+=X[i]
	eor	$t0,$t0,$e,ror#$Sigma1[1]
	eor	$T1,$T1,@X[($j+1)&15],ror#$sigma0[1]
	orr	$t1,$t1,$t2			// Ch(e,f,g)
	eor	$t2,$a,$b			// a^b, b^c in next round
	eor	$t0,$t0,$e,ror#$Sigma1[2]	// Sigma1(e)
	eor	$T0,$T0,$a,ror#$Sigma0[1]
	add	$h,$h,$t1			// h+=Ch(e,f,g)
	and	$t3,$t3,$t2			// (b^c)&=(a^b)
	eor	$T2,$T2,@X[($j+14)&15],ror#$sigma1[1]
	eor	$T1,$T1,@X[($j+1)&15],lsr#$sigma0[2]	// sigma0(X[i+1])
	add	$h,$h,$t0			// h+=Sigma1(e)
	eor	$t3,$t3,$b			// Maj(a,b,c)
	eor	$t1,$T0,$a,ror#$Sigma0[2]	// Sigma0(a)
	eor	$T2,$T2,@X[($j+14)&15],lsr#$sigma1[2]	// sigma1(X[i+14])
	add	@X[$j],@X[$j],@X[($j+9)&15]
	add	$d,$d,$h			// d+=h
	add	$h,$h,$t3			// h+=Maj(a,b,c)
	ldr	$t3,[$Ktbl],#$SZ		// *K++, $t2 in next round
	add	@X[$j],@X[$j],$T1
	add	$h,$h,$t1			// h+=Sigma0(a)
	add	@X[$j],@X[$j],$T2
___
	($t2,$t3)=($t3,$t2);
}

$code.=<<___;
#include "arm_arch.h"

.text

.extern	OPENSSL_armcap_P
.globl	$func
.type	$func,%function
.align	6
$func:
___
$code.=<<___	if ($SZ==4);
	ldr	x16,.LOPENSSL_armcap_P
	adr	x17,.LOPENSSL_armcap_P
	add	x16,x16,x17
	ldr	w16,[x16]
	tst	w16,#ARMV8_SHA256
	b.ne	.Lv8_entry
___
$code.=<<___;
	stp	x29,x30,[sp,#-128]!
	add	x29,sp,#0

	stp	x19,x20,[sp,#16]
	stp	x21,x22,[sp,#32]
	stp	x23,x24,[sp,#48]
	stp	x25,x26,[sp,#64]
	stp	x27,x28,[sp,#80]
	sub	sp,sp,#4*$SZ

	ldp	$A,$B,[$ctx]				// load context
	ldp	$C,$D,[$ctx,#2*$SZ]
	ldp	$E,$F,[$ctx,#4*$SZ]
	add	$num,$inp,$num,lsl#`log(16*$SZ)/log(2)`	// end of input
	ldp	$G,$H,[$ctx,#6*$SZ]
	adr	$Ktbl,.LK$BITS
	stp	$ctx,$num,[x29,#96]

.Loop:
	ldp	@X[0],@X[1],[$inp],#2*$SZ
	ldr	$t2,[$Ktbl],#$SZ			// *K++
	eor	$t3,$B,$C				// magic seed
	str	$inp,[x29,#112]
___
for ($i=0;$i<16;$i++)	{ &BODY_00_xx($i,@V); unshift(@V,pop(@V)); }
$code.=".Loop_16_xx:\n";
for (;$i<32;$i++)	{ &BODY_00_xx($i,@V); unshift(@V,pop(@V)); }
$code.=<<___;
	cbnz	$t2,.Loop_16_xx

	ldp	$ctx,$num,[x29,#96]
	ldr	$inp,[x29,#112]
	sub	$Ktbl,$Ktbl,#`$SZ*($rounds+1)`		// rewind

	ldp	@X[0],@X[1],[$ctx]
	ldp	@X[2],@X[3],[$ctx,#2*$SZ]
	add	$inp,$inp,#14*$SZ			// advance input pointer
	ldp	@X[4],@X[5],[$ctx,#4*$SZ]
	add	$A,$A,@X[0]
	ldp	@X[6],@X[7],[$ctx,#6*$SZ]
	add	$B,$B,@X[1]
	add	$C,$C,@X[2]
	add	$D,$D,@X[3]
	stp	$A,$B,[$ctx]
	add	$E,$E,@X[4]
	add	$F,$F,@X[5]
	stp	$C,$D,[$ctx,#2*$SZ]
	add	$G,$G,@X[6]
	add	$H,$H,@X[7]
	cmp	$inp,$num
	stp	$E,$F,[$ctx,#4*$SZ]
	stp	$G,$H,[$ctx,#6*$SZ]
	b.ne	.Loop

	ldp	x19,x20,[x29,#16]
	add	sp,sp,#4*$SZ
	ldp	x21,x22,[x29,#32]
	ldp	x23,x24,[x29,#48]
	ldp	x25,x26,[x29,#64]
	ldp	x27,x28,[x29,#80]
	ldp	x29,x30,[sp],#128
	ret
.size	$func,.-$func

.align	6
.type	.LK$BITS,%object
.LK$BITS:
___
$code.=<<___ if ($SZ==8);
	.quad	0x428a2f98d728ae22,0x7137449123ef65cd
	.quad	0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc
	.quad	0x3956c25bf348b538,0x59f111f1b605d019
	.quad	0x923f82a4af194f9b,0xab1c5ed5da6d8118
	.quad	0xd807aa98a3030242,0x12835b0145706fbe
	.quad	0x243185be4ee4b28c,0x550c7dc3d5ffb4e2
	.quad	0x72be5d74f27b896f,0x80deb1fe3b1696b1
	.quad	0x9bdc06a725c71235,0xc19bf174cf692694
	.quad	0xe49b69c19ef14ad2,0xefbe4786384f25e3
	.quad	0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65
	.quad	0x2de92c6f592b0275,0x4a7484aa6ea6e483
	.quad	0x5cb0a9dcbd41fbd4,0x76f988da831153b5
	.quad	0x983e5152ee66dfab,0xa831c66d2db43210
	.quad	0xb00327c898fb213f,0xbf597fc7beef0ee4
	.quad	0xc6e00bf33da88fc2,0xd5a79147930aa725
	.quad	0x06ca6351e003826f,0x142929670a0e6e70
	.quad	0x27b70a8546d22ffc,0x2e1b21385c26c926
	.quad	0x4d2c6dfc5ac42aed,0x53380d139d95b3df
	.quad	0x650a73548baf63de,0x766a0abb3c77b2a8
	.quad	0x81c2c92e47edaee6,0x92722c851482353b
	.quad	0xa2bfe8a14cf10364,0xa81a664bbc423001
	.quad	0xc24b8b70d0f89791,0xc76c51a30654be30
	.quad	0xd192e819d6ef5218,0xd69906245565a910
	.quad	0xf40e35855771202a,0x106aa07032bbd1b8
	.quad	0x19a4c116b8d2d0c8,0x1e376c085141ab53
	.quad	0x2748774cdf8eeb99,0x34b0bcb5e19b48a8
	.quad	0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb
	.quad	0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3
	.quad	0x748f82ee5defb2fc,0x78a5636f43172f60
	.quad	0x84c87814a1f0ab72,0x8cc702081a6439ec
	.quad	0x90befffa23631e28,0xa4506cebde82bde9
	.quad	0xbef9a3f7b2c67915,0xc67178f2e372532b
	.quad	0xca273eceea26619c,0xd186b8c721c0c207
	.quad	0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178
	.quad	0x06f067aa72176fba,0x0a637dc5a2c898a6
	.quad	0x113f9804bef90dae,0x1b710b35131c471b
	.quad	0x28db77f523047d84,0x32caab7b40c72493
	.quad	0x3c9ebe0a15c9bebc,0x431d67c49c100d4c
	.quad	0x4cc5d4becb3e42b6,0x597f299cfc657e2a
	.quad	0x5fcb6fab3ad6faec,0x6c44198c4a475817
	.quad	0	// terminator
___
$code.=<<___ if ($SZ==4);
	.long	0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
	.long	0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
	.long	0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
	.long	0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
	.long	0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
	.long	0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
	.long	0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
	.long	0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
	.long	0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
	.long	0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
	.long	0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
	.long	0xd192e819,0xd6990624,0xf40e3585,0x106aa070
	.long	0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
	.long	0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
	.long	0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
	.long	0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
	.long	0	//terminator
___
$code.=<<___;
.size	.LK$BITS,.-.LK$BITS
.align	3
.LOPENSSL_armcap_P:
	.quad	OPENSSL_armcap_P-.
.asciz	"SHA$BITS block transform for ARMv8, CRYPTOGAMS by <appro\@openssl.org>"
.align	2
___

if ($SZ==4) {
my $Ktbl="x3";

my ($ABCD,$EFGH,$abcd)=map("v$_.16b",(0..2));
my @MSG=map("v$_.16b",(4..7));
my ($W0,$W1)=("v16.4s","v17.4s");
my ($ABCD_SAVE,$EFGH_SAVE)=("v18.16b","v19.16b");

$code.=<<___;
.type	sha256_block_armv8,%function
.align	6
sha256_block_armv8:
.Lv8_entry:
	stp		x29,x30,[sp,#-16]!
	add		x29,sp,#0

	ld1.32		{$ABCD,$EFGH},[$ctx]
	adr		$Ktbl,.LK256

.Loop_hw:
	ld1		{@MSG[0]-@MSG[3]},[$inp],#64
	sub		$num,$num,#1
	ld1.32		{$W0},[$Ktbl],#16
	rev32		@MSG[0],@MSG[0]
	rev32		@MSG[1],@MSG[1]
	rev32		@MSG[2],@MSG[2]
	rev32		@MSG[3],@MSG[3]
	orr		$ABCD_SAVE,$ABCD,$ABCD		// offload
	orr		$EFGH_SAVE,$EFGH,$EFGH
___
for($i=0;$i<12;$i++) {
$code.=<<___;
	ld1.32		{$W1},[$Ktbl],#16
	add.i32		$W0,$W0,@MSG[0]
	sha256su0	@MSG[0],@MSG[1]
	orr		$abcd,$ABCD,$ABCD
	sha256h		$ABCD,$EFGH,$W0
	sha256h2	$EFGH,$abcd,$W0
	sha256su1	@MSG[0],@MSG[2],@MSG[3]
___
	($W0,$W1)=($W1,$W0);	push(@MSG,shift(@MSG));
}
$code.=<<___;
	ld1.32		{$W1},[$Ktbl],#16
	add.i32		$W0,$W0,@MSG[0]
	orr		$abcd,$ABCD,$ABCD
	sha256h		$ABCD,$EFGH,$W0
	sha256h2	$EFGH,$abcd,$W0

	ld1.32		{$W0},[$Ktbl],#16
	add.i32		$W1,$W1,@MSG[1]
	orr		$abcd,$ABCD,$ABCD
	sha256h		$ABCD,$EFGH,$W1
	sha256h2	$EFGH,$abcd,$W1

	ld1.32		{$W1},[$Ktbl]
	add.i32		$W0,$W0,@MSG[2]
	sub		$Ktbl,$Ktbl,#$rounds*$SZ-16	// rewind
	orr		$abcd,$ABCD,$ABCD
	sha256h		$ABCD,$EFGH,$W0
	sha256h2	$EFGH,$abcd,$W0

	add.i32		$W1,$W1,@MSG[3]
	orr		$abcd,$ABCD,$ABCD
	sha256h		$ABCD,$EFGH,$W1
	sha256h2	$EFGH,$abcd,$W1

	add.i32		$ABCD,$ABCD,$ABCD_SAVE
	add.i32		$EFGH,$EFGH,$EFGH_SAVE

	cbnz		$num,.Loop_hw

	st1.32		{$ABCD,$EFGH},[$ctx]

	ldr		x29,[sp],#16
	ret
.size	sha256_block_armv8,.-sha256_block_armv8
___
}

$code.=<<___;
.comm	OPENSSL_armcap_P,4,4
___

{   my  %opcode = (
	"sha256h"	=> 0x5e004000,	"sha256h2"	=> 0x5e005000,
	"sha256su0"	=> 0x5e282800,	"sha256su1"	=> 0x5e006000	);

    sub unsha256 {
	my ($mnemonic,$arg)=@_;

	$arg =~ m/[qv]([0-9]+)[^,]*,\s*[qv]([0-9]+)[^,]*(?:,\s*[qv]([0-9]+))?/o
	&&
	sprintf ".inst\t0x%08x\t//%s %s",
			$opcode{$mnemonic}|$1|($2<<5)|($3<<16),
			$mnemonic,$arg;
    }
}

foreach(split("\n",$code)) {

	s/\`([^\`]*)\`/eval($1)/geo;

	s/\b(sha256\w+)\s+([qv].*)/unsha256($1,$2)/geo;

	s/\.\w?32\b//o		and s/\.16b/\.4s/go;
	m/(ld|st)1[^\[]+\[0\]/o	and s/\.4s/\.s/go;

	print $_,"\n";
}

close STDOUT;
Commit	Line	Data
ddb6b965 AP	1	#!/usr/bin/env perl
	2	#
	3	# ====================================================================
	4	# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
	5	# project. The module is, however, dual licensed under OpenSSL and
	6	# CRYPTOGAMS licenses depending on where you obtain it. For further
	7	# details see http://www.openssl.org/~appro/cryptogams/.
	8	# ====================================================================
	9	#
	10	# SHA256/512 for ARMv8.
	11	#
	12	# Performance in cycles per processed byte and improvement coefficient
	13	# over code generated with "default" compiler:
	14	#
	15	# SHA256-hw SHA256(*) SHA512
	16	# Apple A7 1.97 10.5 (+33%) 6.73 (-1%(**))
0f777aeb AP	17	# Cortex-A53 2.38 15.6 (+110%) 10.1 (+190%(***))
0f777aeb AP	18	# Cortex-A57 2.31 11.6 (+86%) 7.51 (+260%(***))
ddb6b965 AP	19	#
	20	# (*) Software SHA256 results are of lesser relevance, presented
	21	# mostly for informational purposes.
	22	# (**) The result is a trade-off: it's possible to improve it by
0f777aeb AP	23	# 10% (or by 1 cycle per round), but at the cost of 20% loss
	24	# on Cortex-A53 (or by 4 cycles per round).
	25	# (***) Super-impressive coefficients over gcc-generated code are
	26	# indication of some compiler "pathology", most notably code
	27	# generated with -mgeneral-regs-only is significanty faster
	28	# and lags behind assembly only by 50-90%.
ddb6b965 AP	29
	30	$flavour=shift;
	31	$output=shift;
9b05cbc3 AP	32
	33	$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
	34	( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
	35	( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
	36	die "can't locate arm-xlate.pl";
	37
	38	open OUT,"\| \"$^X\" $xlate $flavour $output";
	39	STDOUT=OUT;
ddb6b965 AP	40
	41	if ($output =~ /512/) {
	42	$BITS=512;
	43	$SZ=8;
	44	@Sigma0=(28,34,39);
	45	@Sigma1=(14,18,41);
	46	@sigma0=(1, 8, 7);
	47	@sigma1=(19,61, 6);
	48	$rounds=80;
	49	$reg_t="x";
	50	} else {
	51	$BITS=256;
	52	$SZ=4;
	53	@Sigma0=( 2,13,22);
	54	@Sigma1=( 6,11,25);
	55	@sigma0=( 7,18, 3);
	56	@sigma1=(17,19,10);
	57	$rounds=64;
	58	$reg_t="w";
	59	}
	60
	61	$func="sha${BITS}_block_data_order";
	62
	63	($ctx,$inp,$num,$Ktbl)=map("x$_",(0..2,30));
	64
	65	@X=map("$reg_t$_",(3..15,0..2));
	66	@V=($A,$B,$C,$D,$E,$F,$G,$H)=map("$reg_t$_",(20..27));
	67	($t0,$t1,$t2,$t3)=map("$reg_t$_",(16,17,19,28));
	68
	69	sub BODY_00_xx {
	70	my ($i,$a,$b,$c,$d,$e,$f,$g,$h)=@_;
	71	my $j=($i+1)&15;
	72	my ($T0,$T1,$T2)=(@X[($i-8)&15],@X[($i-9)&15],@X[($i-10)&15]);
	73	$T0=@X[$i+3] if ($i<11);
	74
	75	$code.=<<___ if ($i<16);
	76	#ifndef __ARMEB__
	77	rev @X[$i],@X[$i] // $i
	78	#endif
	79	___
	80	$code.=<<___ if ($i<13 && ($i&1));
	81	ldp @X[$i+1],@X[$i+2],[$inp],#2*$SZ
	82	___
	83	$code.=<<___ if ($i==13);
	84	ldp @X[14],@X[15],[$inp]
	85	___
	86	$code.=<<___ if ($i>=14);
	87	ldr @X[($i-11)&15],[sp,#`$SZ*(($i-11)%4)`]
	88	___
	89	$code.=<<___ if ($i>0 && $i<16);
	90	add $a,$a,$t1 // h+=Sigma0(a)
	91	___
	92	$code.=<<___ if ($i>=11);
	93	str @X[($i-8)&15],[sp,#`$SZ*(($i-8)%4)`]
	94	___
	95	# While ARMv8 specifies merged rotate-n-logical operation such as
	96	# 'eor x,y,z,ror#n', it was found to negatively affect performance
	97	# on Apple A7. The reason seems to be that it requires even 'y' to
	98	# be available earlier. This means that such merged instruction is
	99	# not necessarily best choice on critical path... On the other hand
	100	# Cortex-A5x handles merged instructions much better than disjoint
	101	# rotate and logical... See (**) footnote above.
	102	$code.=<<___ if ($i<15);
	103	ror $t0,$e,#$Sigma1[0]
104	add $h,$h,$t2 // h+=K[i]
105	eor $T0,$e,$e,ror#`$Sigma1[2]-$Sigma1[1]`
106	and $t1,$f,$e
107	bic $t2,$g,$e
108	add $h,$h,@X[$i&15] // h+=X[i]
109	orr $t1,$t1,$t2 // Ch(e,f,g)
110	eor $t2,$a,$b // a^b, b^c in next round
111	eor $t0,$t0,$T0,ror#$Sigma1[1] // Sigma1(e)
112	ror $T0,$a,#$Sigma0[0]
113	add $h,$h,$t1 // h+=Ch(e,f,g)
114	eor $t1,$a,$a,ror#`$Sigma0[2]-$Sigma0[1]`
115	add $h,$h,$t0 // h+=Sigma1(e)
116	and $t3,$t3,$t2 // (b^c)&=(a^b)
117	add $d,$d,$h // d+=h
118	eor $t3,$t3,$b // Maj(a,b,c)
119	eor $t1,$T0,$t1,ror#$Sigma0[1] // Sigma0(a)
120	add $h,$h,$t3 // h+=Maj(a,b,c)
121	ldr $t3,[$Ktbl],#$SZ // *K++, $t2 in next round
122	//add $h,$h,$t1 // h+=Sigma0(a)
123	___
124	$code.=<<___ if ($i>=15);
125	ror $t0,$e,#$Sigma1[0]
126	add $h,$h,$t2 // h+=K[i]
127	ror $T1,@X[($j+1)&15],#$sigma0[0]
128	and $t1,$f,$e
129	ror $T2,@X[($j+14)&15],#$sigma1[0]
130	bic $t2,$g,$e
131	ror $T0,$a,#$Sigma0[0]
132	add $h,$h,@X[$i&15] // h+=X[i]
133	eor $t0,$t0,$e,ror#$Sigma1[1]
134	eor $T1,$T1,@X[($j+1)&15],ror#$sigma0[1]
135	orr $t1,$t1,$t2 // Ch(e,f,g)
136	eor $t2,$a,$b // a^b, b^c in next round
137	eor $t0,$t0,$e,ror#$Sigma1[2] // Sigma1(e)
138	eor $T0,$T0,$a,ror#$Sigma0[1]
139	add $h,$h,$t1 // h+=Ch(e,f,g)
140	and $t3,$t3,$t2 // (b^c)&=(a^b)
141	eor $T2,$T2,@X[($j+14)&15],ror#$sigma1[1]
142	eor $T1,$T1,@X[($j+1)&15],lsr#$sigma0[2] // sigma0(X[i+1])
143	add $h,$h,$t0 // h+=Sigma1(e)
144	eor $t3,$t3,$b // Maj(a,b,c)
145	eor $t1,$T0,$a,ror#$Sigma0[2] // Sigma0(a)
146	eor $T2,$T2,@X[($j+14)&15],lsr#$sigma1[2] // sigma1(X[i+14])
147	add @X[$j],@X[$j],@X[($j+9)&15]
148	add $d,$d,$h // d+=h
149	add $h,$h,$t3 // h+=Maj(a,b,c)
150	ldr $t3,[$Ktbl],#$SZ // *K++, $t2 in next round
151	add @X[$j],@X[$j],$T1
152	add $h,$h,$t1 // h+=Sigma0(a)
153	add @X[$j],@X[$j],$T2
154	___
155	($t2,$t3)=($t3,$t2);
156	}
157
158	$code.=<<___;
159	#include "arm_arch.h"
160
161	.text
162
9b05cbc3	163	.extern OPENSSL_armcap_P
ddb6b965 AP	164	.globl $func
	165	.type $func,%function
	166	.align 6
	167	$func:
	168	___
	169	$code.=<<___ if ($SZ==4);
	170	ldr x16,.LOPENSSL_armcap_P
	171	adr x17,.LOPENSSL_armcap_P
	172	add x16,x16,x17
	173	ldr w16,[x16]
	174	tst w16,#ARMV8_SHA256
	175	b.ne .Lv8_entry
	176	___
	177	$code.=<<___;
	178	stp x29,x30,[sp,#-128]!
	179	add x29,sp,#0
	180
	181	stp x19,x20,[sp,#16]
	182	stp x21,x22,[sp,#32]
	183	stp x23,x24,[sp,#48]
	184	stp x25,x26,[sp,#64]
	185	stp x27,x28,[sp,#80]
	186	sub sp,sp,#4*$SZ
	187
	188	ldp $A,$B,[$ctx] // load context
	189	ldp $C,$D,[$ctx,#2*$SZ]
	190	ldp $E,$F,[$ctx,#4*$SZ]
	191	add $num,$inp,$num,lsl#`log(16*$SZ)/log(2)` // end of input
	192	ldp $G,$H,[$ctx,#6*$SZ]
9b05cbc3	193	adr $Ktbl,.LK$BITS
ddb6b965 AP	194	stp $ctx,$num,[x29,#96]
	195
	196	.Loop:
	197	ldp @X[0],@X[1],[$inp],#2*$SZ
	198	ldr $t2,[$Ktbl],#$SZ // *K++
	199	eor $t3,$B,$C // magic seed
	200	str $inp,[x29,#112]
	201	___
	202	for ($i=0;$i<16;$i++) { &BODY_00_xx($i,@V); unshift(@V,pop(@V)); }
	203	$code.=".Loop_16_xx:\n";
	204	for (;$i<32;$i++) { &BODY_00_xx($i,@V); unshift(@V,pop(@V)); }
	205	$code.=<<___;
	206	cbnz $t2,.Loop_16_xx
	207
	208	ldp $ctx,$num,[x29,#96]
	209	ldr $inp,[x29,#112]
	210	sub $Ktbl,$Ktbl,#`$SZ*($rounds+1)` // rewind
	211
	212	ldp @X[0],@X[1],[$ctx]
	213	ldp @X[2],@X[3],[$ctx,#2*$SZ]
	214	add $inp,$inp,#14*$SZ // advance input pointer
	215	ldp @X[4],@X[5],[$ctx,#4*$SZ]
	216	add $A,$A,@X[0]
	217	ldp @X[6],@X[7],[$ctx,#6*$SZ]
	218	add $B,$B,@X[1]
	219	add $C,$C,@X[2]
	220	add $D,$D,@X[3]
	221	stp $A,$B,[$ctx]
	222	add $E,$E,@X[4]
	223	add $F,$F,@X[5]
	224	stp $C,$D,[$ctx,#2*$SZ]
	225	add $G,$G,@X[6]
	226	add $H,$H,@X[7]
	227	cmp $inp,$num
	228	stp $E,$F,[$ctx,#4*$SZ]
	229	stp $G,$H,[$ctx,#6*$SZ]
	230	b.ne .Loop
	231
	232	ldp x19,x20,[x29,#16]
	233	add sp,sp,#4*$SZ
	234	ldp x21,x22,[x29,#32]
	235	ldp x23,x24,[x29,#48]
	236	ldp x25,x26,[x29,#64]
	237	ldp x27,x28,[x29,#80]
	238	ldp x29,x30,[sp],#128
	239	ret
	240	.size $func,.-$func
	241
	242	.align 6
9b05cbc3 AP	243	.type .LK$BITS,%object
9b05cbc3 AP	244	.LK$BITS:
ddb6b965 AP	245	___
	246	$code.=<<___ if ($SZ==8);
	247	.quad 0x428a2f98d728ae22,0x7137449123ef65cd
	248	.quad 0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc
	249	.quad 0x3956c25bf348b538,0x59f111f1b605d019
	250	.quad 0x923f82a4af194f9b,0xab1c5ed5da6d8118
	251	.quad 0xd807aa98a3030242,0x12835b0145706fbe
	252	.quad 0x243185be4ee4b28c,0x550c7dc3d5ffb4e2
	253	.quad 0x72be5d74f27b896f,0x80deb1fe3b1696b1
	254	.quad 0x9bdc06a725c71235,0xc19bf174cf692694
	255	.quad 0xe49b69c19ef14ad2,0xefbe4786384f25e3
	256	.quad 0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65
	257	.quad 0x2de92c6f592b0275,0x4a7484aa6ea6e483
	258	.quad 0x5cb0a9dcbd41fbd4,0x76f988da831153b5
	259	.quad 0x983e5152ee66dfab,0xa831c66d2db43210
	260	.quad 0xb00327c898fb213f,0xbf597fc7beef0ee4
	261	.quad 0xc6e00bf33da88fc2,0xd5a79147930aa725
	262	.quad 0x06ca6351e003826f,0x142929670a0e6e70
	263	.quad 0x27b70a8546d22ffc,0x2e1b21385c26c926
	264	.quad 0x4d2c6dfc5ac42aed,0x53380d139d95b3df
	265	.quad 0x650a73548baf63de,0x766a0abb3c77b2a8
	266	.quad 0x81c2c92e47edaee6,0x92722c851482353b
	267	.quad 0xa2bfe8a14cf10364,0xa81a664bbc423001
	268	.quad 0xc24b8b70d0f89791,0xc76c51a30654be30
	269	.quad 0xd192e819d6ef5218,0xd69906245565a910
	270	.quad 0xf40e35855771202a,0x106aa07032bbd1b8
	271	.quad 0x19a4c116b8d2d0c8,0x1e376c085141ab53
	272	.quad 0x2748774cdf8eeb99,0x34b0bcb5e19b48a8
	273	.quad 0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb
	274	.quad 0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3
	275	.quad 0x748f82ee5defb2fc,0x78a5636f43172f60
	276	.quad 0x84c87814a1f0ab72,0x8cc702081a6439ec
	277	.quad 0x90befffa23631e28,0xa4506cebde82bde9
	278	.quad 0xbef9a3f7b2c67915,0xc67178f2e372532b
	279	.quad 0xca273eceea26619c,0xd186b8c721c0c207
	280	.quad 0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178
	281	.quad 0x06f067aa72176fba,0x0a637dc5a2c898a6
	282	.quad 0x113f9804bef90dae,0x1b710b35131c471b
	283	.quad 0x28db77f523047d84,0x32caab7b40c72493
	284	.quad 0x3c9ebe0a15c9bebc,0x431d67c49c100d4c
	285	.quad 0x4cc5d4becb3e42b6,0x597f299cfc657e2a
	286	.quad 0x5fcb6fab3ad6faec,0x6c44198c4a475817
	287	.quad 0 // terminator
	288	___
	289	$code.=<<___ if ($SZ==4);
	290	.long 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
	291	.long 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
	292	.long 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
	293	.long 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
	294	.long 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
	295	.long 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
	296	.long 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
	297	.long 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
	298	.long 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
	299	.long 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
	300	.long 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
	301	.long 0xd192e819,0xd6990624,0xf40e3585,0x106aa070
	302	.long 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
	303	.long 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
	304	.long 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
	305	.long 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
	306	.long 0 //terminator
	307	___
	308	$code.=<<___;
9b05cbc3	309	.size .LK$BITS,.-.LK$BITS
ddb6b965 AP	310	.align 3
	311	.LOPENSSL_armcap_P:
	312	.quad OPENSSL_armcap_P-.
	313	.asciz "SHA$BITS block transform for ARMv8, CRYPTOGAMS by <appro\@openssl.org>"
	314	.align 2
	315	___
	316
	317	if ($SZ==4) {
	318	my $Ktbl="x3";
	319
	320	my ($ABCD,$EFGH,$abcd)=map("v$_.16b",(0..2));
	321	my @MSG=map("v$_.16b",(4..7));
	322	my ($W0,$W1)=("v16.4s","v17.4s");
	323	my ($ABCD_SAVE,$EFGH_SAVE)=("v18.16b","v19.16b");
	324
	325	$code.=<<___;
	326	.type sha256_block_armv8,%function
	327	.align 6
	328	sha256_block_armv8:
	329	.Lv8_entry:
	330	stp x29,x30,[sp,#-16]!
	331	add x29,sp,#0
	332
	333	ld1.32 {$ABCD,$EFGH},[$ctx]
9b05cbc3	334	adr $Ktbl,.LK256
ddb6b965 AP	335
	336	.Loop_hw:
	337	ld1 {@MSG[0]-@MSG[3]},[$inp],#64
	338	sub $num,$num,#1
	339	ld1.32 {$W0},[$Ktbl],#16
	340	rev32 @MSG[0],@MSG[0]
	341	rev32 @MSG[1],@MSG[1]
	342	rev32 @MSG[2],@MSG[2]
	343	rev32 @MSG[3],@MSG[3]
	344	orr $ABCD_SAVE,$ABCD,$ABCD // offload
	345	orr $EFGH_SAVE,$EFGH,$EFGH
	346	___
	347	for($i=0;$i<12;$i++) {
	348	$code.=<<___;
	349	ld1.32 {$W1},[$Ktbl],#16
	350	add.i32 $W0,$W0,@MSG[0]
	351	sha256su0 @MSG[0],@MSG[1]
	352	orr $abcd,$ABCD,$ABCD
	353	sha256h $ABCD,$EFGH,$W0
	354	sha256h2 $EFGH,$abcd,$W0
	355	sha256su1 @MSG[0],@MSG[2],@MSG[3]
	356	___
	357	($W0,$W1)=($W1,$W0); push(@MSG,shift(@MSG));
	358	}
	359	$code.=<<___;
	360	ld1.32 {$W1},[$Ktbl],#16
	361	add.i32 $W0,$W0,@MSG[0]
	362	orr $abcd,$ABCD,$ABCD
	363	sha256h $ABCD,$EFGH,$W0
	364	sha256h2 $EFGH,$abcd,$W0
	365
	366	ld1.32 {$W0},[$Ktbl],#16
	367	add.i32 $W1,$W1,@MSG[1]
	368	orr $abcd,$ABCD,$ABCD
	369	sha256h $ABCD,$EFGH,$W1
	370	sha256h2 $EFGH,$abcd,$W1
	371
	372	ld1.32 {$W1},[$Ktbl]
	373	add.i32 $W0,$W0,@MSG[2]
	374	sub $Ktbl,$Ktbl,#$rounds*$SZ-16 // rewind
	375	orr $abcd,$ABCD,$ABCD
	376	sha256h $ABCD,$EFGH,$W0
	377	sha256h2 $EFGH,$abcd,$W0
	378
	379	add.i32 $W1,$W1,@MSG[3]
	380	orr $abcd,$ABCD,$ABCD
	381	sha256h $ABCD,$EFGH,$W1
	382	sha256h2 $EFGH,$abcd,$W1
	383
	384	add.i32 $ABCD,$ABCD,$ABCD_SAVE
	385	add.i32 $EFGH,$EFGH,$EFGH_SAVE
	386
	387	cbnz $num,.Loop_hw
	388
	389	st1.32 {$ABCD,$EFGH},[$ctx]
	390
	391	ldr x29,[sp],#16
	392	ret
	393	.size sha256_block_armv8,.-sha256_block_armv8
	394	___
	395	}
	396
	397	$code.=<<___;
	398	.comm OPENSSL_armcap_P,4,4
399	___
400
401	{ my %opcode = (
402	"sha256h" => 0x5e004000, "sha256h2" => 0x5e005000,
403	"sha256su0" => 0x5e282800, "sha256su1" => 0x5e006000 );
404
405	sub unsha256 {
406	my ($mnemonic,$arg)=@_;
407
408	$arg =~ m/[qv]([0-9]+)[^,],\s[qv]([0-9]+)[^,](?:,\s[qv]([0-9]+))?/o
409	&&
cd91fd7c	410	sprintf ".inst\t0x%08x\t//%s %s",
ddb6b965 AP	411	$opcode{$mnemonic}\|$1\|($2<<5)\|($3<<16),
	412	$mnemonic,$arg;
	413	}
	414	}
	415
	416	foreach(split("\n",$code)) {
	417
	418	s/\`([^\`]*)\`/eval($1)/geo;
	419
	420	s/\b(sha256\w+)\s+([qv].*)/unsha256($1,$2)/geo;
	421
	422	s/\.\w?32\b//o and s/\.16b/\.4s/go;
	423	m/(ld\|st)1[^\[]+\[0\]/o and s/\.4s/\.s/go;
	424
	425	print $_,"\n";
	426	}
	427
	428	close STDOUT;