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openssl/crypto/poly1305/asm/poly1305-armv4.pl
Richard Levitte 1aa89a7a3a Unify all assembler file generators 
They now generally conform to the following argument sequence:

    script.pl "$(PERLASM_SCHEME)" [ C preprocessor arguments ... ] \
              $(PROCESSOR) <output file>

However, in the spirit of being able to use these scripts manually,
they also allow for no argument, or for only the flavour, or for only
the output file.  This is done by only using the last argument as
output file if it's a file (it has an extension), and only using the
first argument as flavour if it isn't a file (it doesn't have an
extension).

While we're at it, we make all $xlate calls the same, i.e. the $output
argument is always quoted, and we always die on error when trying to
start $xlate.

There's a perl lesson in this, regarding operator priority...

This will always succeed, even when it fails:

    open FOO, "something" || die "ERR: $!";

The reason is that '||' has higher priority than list operators (a
function is essentially a list operator and gobbles up everything
following it that isn't lower priority), and since a non-empty string
is always true, so that ends up being exactly the same as:

    open FOO, "something";

This, however, will fail if "something" can't be opened:

    open FOO, "something" or die "ERR: $!";

The reason is that 'or' has lower priority that list operators,
i.e. it's performed after the 'open' call.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9884)
2019-09-16 16:29:57 +02:00

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#! /usr/bin/env perl
# Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the Apache License 2.0 (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/.
# ====================================================================
#
# IALU(*)/gcc-4.4 NEON
#
# ARM11xx(ARMv6) 7.78/+100% -
# Cortex-A5 6.35/+130% 3.00
# Cortex-A8 6.25/+115% 2.36
# Cortex-A9 5.10/+95% 2.55
# Cortex-A15 3.85/+85% 1.25(**)
# Snapdragon S4 5.70/+100% 1.48(**)
#
# (*) this is for -march=armv6, i.e. with bunch of ldrb loading data;
# (**) these are trade-off results, they can be improved by ~8% but at
# the cost of 15/12% regression on Cortex-A5/A7, it's even possible
# to improve Cortex-A9 result, but then A5/A7 loose more than 20%;
# $output is the last argument if it looks like a file (it has an extension)
# $flavour is the first argument if it doesn't look like a file
$output = $#ARGV >= 0 && $ARGV[$#ARGV] =~ m|\.\w+$| ? pop : undef;
$flavour = $#ARGV >= 0 && $ARGV[0] !~ m|\.| ? shift : undef;
if ($flavour && $flavour ne "void") {
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
die "can't locate arm-xlate.pl";
open STDOUT,"| \"$^X\" $xlate $flavour \"$output\""
or die "can't call $xlate: $!";
} else {
$output and open STDOUT,">$output";
}
($ctx,$inp,$len,$padbit)=map("r$_",(0..3));
$code.=<<___;
#include "arm_arch.h"
#if defined(__thumb2__)
.syntax unified
.thumb
#else
.code 32
#endif
.text
.globl poly1305_emit
.globl poly1305_blocks
.globl poly1305_init
.type poly1305_init,%function
.align 5
poly1305_init:
.Lpoly1305_init:
stmdb sp!,{r4-r11}
eor r3,r3,r3
cmp $inp,#0
str r3,[$ctx,#0] @ zero hash value
str r3,[$ctx,#4]
str r3,[$ctx,#8]
str r3,[$ctx,#12]
str r3,[$ctx,#16]
str r3,[$ctx,#36] @ is_base2_26
add $ctx,$ctx,#20
#ifdef __thumb2__
it eq
#endif
moveq r0,#0
beq .Lno_key
#if __ARM_MAX_ARCH__>=7
adr r11,.Lpoly1305_init
ldr r12,.LOPENSSL_armcap
#endif
ldrb r4,[$inp,#0]
mov r10,#0x0fffffff
ldrb r5,[$inp,#1]
and r3,r10,#-4 @ 0x0ffffffc
ldrb r6,[$inp,#2]
ldrb r7,[$inp,#3]
orr r4,r4,r5,lsl#8
ldrb r5,[$inp,#4]
orr r4,r4,r6,lsl#16
ldrb r6,[$inp,#5]
orr r4,r4,r7,lsl#24
ldrb r7,[$inp,#6]
and r4,r4,r10
#if __ARM_MAX_ARCH__>=7
# if !defined(_WIN32)
ldr r12,[r11,r12] @ OPENSSL_armcap_P
# endif
# if defined(__APPLE__) || defined(_WIN32)
ldr r12,[r12]
# endif
#endif
ldrb r8,[$inp,#7]
orr r5,r5,r6,lsl#8
ldrb r6,[$inp,#8]
orr r5,r5,r7,lsl#16
ldrb r7,[$inp,#9]
orr r5,r5,r8,lsl#24
ldrb r8,[$inp,#10]
and r5,r5,r3
#if __ARM_MAX_ARCH__>=7
tst r12,#ARMV7_NEON @ check for NEON
# ifdef __thumb2__
adr r9,.Lpoly1305_blocks_neon
adr r11,.Lpoly1305_blocks
adr r12,.Lpoly1305_emit
adr r10,.Lpoly1305_emit_neon
itt ne
movne r11,r9
movne r12,r10
orr r11,r11,#1 @ thumb-ify address
orr r12,r12,#1
# else
addeq r12,r11,#(.Lpoly1305_emit-.Lpoly1305_init)
addne r12,r11,#(.Lpoly1305_emit_neon-.Lpoly1305_init)
addeq r11,r11,#(.Lpoly1305_blocks-.Lpoly1305_init)
addne r11,r11,#(.Lpoly1305_blocks_neon-.Lpoly1305_init)
# endif
#endif
ldrb r9,[$inp,#11]
orr r6,r6,r7,lsl#8
ldrb r7,[$inp,#12]
orr r6,r6,r8,lsl#16
ldrb r8,[$inp,#13]
orr r6,r6,r9,lsl#24
ldrb r9,[$inp,#14]
and r6,r6,r3
ldrb r10,[$inp,#15]
orr r7,r7,r8,lsl#8
str r4,[$ctx,#0]
orr r7,r7,r9,lsl#16
str r5,[$ctx,#4]
orr r7,r7,r10,lsl#24
str r6,[$ctx,#8]
and r7,r7,r3
str r7,[$ctx,#12]
#if __ARM_MAX_ARCH__>=7
stmia r2,{r11,r12} @ fill functions table
mov r0,#1
#else
mov r0,#0
#endif
.Lno_key:
ldmia sp!,{r4-r11}
#if __ARM_ARCH__>=5
ret @ bx lr
#else
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
#endif
.size poly1305_init,.-poly1305_init
___
{
my ($h0,$h1,$h2,$h3,$h4,$r0,$r1,$r2,$r3)=map("r$_",(4..12));
my ($s1,$s2,$s3)=($r1,$r2,$r3);
$code.=<<___;
.type poly1305_blocks,%function
.align 5
poly1305_blocks:
.Lpoly1305_blocks:
stmdb sp!,{r3-r11,lr}
ands $len,$len,#-16
beq .Lno_data
cmp $padbit,#0
add $len,$len,$inp @ end pointer
sub sp,sp,#32
ldmia $ctx,{$h0-$r3} @ load context
str $ctx,[sp,#12] @ offload stuff
mov lr,$inp
str $len,[sp,#16]
str $r1,[sp,#20]
str $r2,[sp,#24]
str $r3,[sp,#28]
b .Loop
.Loop:
#if __ARM_ARCH__<7
ldrb r0,[lr],#16 @ load input
# ifdef __thumb2__
it hi
# endif
addhi $h4,$h4,#1 @ 1<<128
ldrb r1,[lr,#-15]
ldrb r2,[lr,#-14]
ldrb r3,[lr,#-13]
orr r1,r0,r1,lsl#8
ldrb r0,[lr,#-12]
orr r2,r1,r2,lsl#16
ldrb r1,[lr,#-11]
orr r3,r2,r3,lsl#24
ldrb r2,[lr,#-10]
adds $h0,$h0,r3 @ accumulate input
ldrb r3,[lr,#-9]
orr r1,r0,r1,lsl#8
ldrb r0,[lr,#-8]
orr r2,r1,r2,lsl#16
ldrb r1,[lr,#-7]
orr r3,r2,r3,lsl#24
ldrb r2,[lr,#-6]
adcs $h1,$h1,r3
ldrb r3,[lr,#-5]
orr r1,r0,r1,lsl#8
ldrb r0,[lr,#-4]
orr r2,r1,r2,lsl#16
ldrb r1,[lr,#-3]
orr r3,r2,r3,lsl#24
ldrb r2,[lr,#-2]
adcs $h2,$h2,r3
ldrb r3,[lr,#-1]
orr r1,r0,r1,lsl#8
str lr,[sp,#8] @ offload input pointer
orr r2,r1,r2,lsl#16
add $s1,$r1,$r1,lsr#2
orr r3,r2,r3,lsl#24
#else
ldr r0,[lr],#16 @ load input
# ifdef __thumb2__
it hi
# endif
addhi $h4,$h4,#1 @ padbit
ldr r1,[lr,#-12]
ldr r2,[lr,#-8]
ldr r3,[lr,#-4]
# ifdef __ARMEB__
rev r0,r0
rev r1,r1
rev r2,r2
rev r3,r3
# endif
adds $h0,$h0,r0 @ accumulate input
str lr,[sp,#8] @ offload input pointer
adcs $h1,$h1,r1
add $s1,$r1,$r1,lsr#2
adcs $h2,$h2,r2
#endif
add $s2,$r2,$r2,lsr#2
adcs $h3,$h3,r3
add $s3,$r3,$r3,lsr#2
umull r2,r3,$h1,$r0
adc $h4,$h4,#0
umull r0,r1,$h0,$r0
umlal r2,r3,$h4,$s1
umlal r0,r1,$h3,$s1
ldr $r1,[sp,#20] @ reload $r1
umlal r2,r3,$h2,$s3
umlal r0,r1,$h1,$s3
umlal r2,r3,$h3,$s2
umlal r0,r1,$h2,$s2
umlal r2,r3,$h0,$r1
str r0,[sp,#0] @ future $h0
mul r0,$s2,$h4
ldr $r2,[sp,#24] @ reload $r2
adds r2,r2,r1 @ d1+=d0>>32
eor r1,r1,r1
adc lr,r3,#0 @ future $h2
str r2,[sp,#4] @ future $h1
mul r2,$s3,$h4
eor r3,r3,r3
umlal r0,r1,$h3,$s3
ldr $r3,[sp,#28] @ reload $r3
umlal r2,r3,$h3,$r0
umlal r0,r1,$h2,$r0
umlal r2,r3,$h2,$r1
umlal r0,r1,$h1,$r1
umlal r2,r3,$h1,$r2
umlal r0,r1,$h0,$r2
umlal r2,r3,$h0,$r3
ldr $h0,[sp,#0]
mul $h4,$r0,$h4
ldr $h1,[sp,#4]
adds $h2,lr,r0 @ d2+=d1>>32
ldr lr,[sp,#8] @ reload input pointer
adc r1,r1,#0
adds $h3,r2,r1 @ d3+=d2>>32
ldr r0,[sp,#16] @ reload end pointer
adc r3,r3,#0
add $h4,$h4,r3 @ h4+=d3>>32
and r1,$h4,#-4
and $h4,$h4,#3
add r1,r1,r1,lsr#2 @ *=5
adds $h0,$h0,r1
adcs $h1,$h1,#0
adcs $h2,$h2,#0
adcs $h3,$h3,#0
adc $h4,$h4,#0
cmp r0,lr @ done yet?
bhi .Loop
ldr $ctx,[sp,#12]
add sp,sp,#32
stmia $ctx,{$h0-$h4} @ store the result
.Lno_data:
#if __ARM_ARCH__>=5
ldmia sp!,{r3-r11,pc}
#else
ldmia sp!,{r3-r11,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
#endif
.size poly1305_blocks,.-poly1305_blocks
___
}
{
my ($ctx,$mac,$nonce)=map("r$_",(0..2));
my ($h0,$h1,$h2,$h3,$h4,$g0,$g1,$g2,$g3)=map("r$_",(3..11));
my $g4=$h4;
$code.=<<___;
.type poly1305_emit,%function
.align 5
poly1305_emit:
.Lpoly1305_emit:
stmdb sp!,{r4-r11}
.Lpoly1305_emit_enter:
ldmia $ctx,{$h0-$h4}
adds $g0,$h0,#5 @ compare to modulus
adcs $g1,$h1,#0
adcs $g2,$h2,#0
adcs $g3,$h3,#0
adc $g4,$h4,#0
tst $g4,#4 @ did it carry/borrow?
#ifdef __thumb2__
it ne
#endif
movne $h0,$g0
ldr $g0,[$nonce,#0]
#ifdef __thumb2__
it ne
#endif
movne $h1,$g1
ldr $g1,[$nonce,#4]
#ifdef __thumb2__
it ne
#endif
movne $h2,$g2
ldr $g2,[$nonce,#8]
#ifdef __thumb2__
it ne
#endif
movne $h3,$g3
ldr $g3,[$nonce,#12]
adds $h0,$h0,$g0
adcs $h1,$h1,$g1
adcs $h2,$h2,$g2
adc $h3,$h3,$g3
#if __ARM_ARCH__>=7
# ifdef __ARMEB__
rev $h0,$h0
rev $h1,$h1
rev $h2,$h2
rev $h3,$h3
# endif
str $h0,[$mac,#0]
str $h1,[$mac,#4]
str $h2,[$mac,#8]
str $h3,[$mac,#12]
#else
strb $h0,[$mac,#0]
mov $h0,$h0,lsr#8
strb $h1,[$mac,#4]
mov $h1,$h1,lsr#8
strb $h2,[$mac,#8]
mov $h2,$h2,lsr#8
strb $h3,[$mac,#12]
mov $h3,$h3,lsr#8
strb $h0,[$mac,#1]
mov $h0,$h0,lsr#8
strb $h1,[$mac,#5]
mov $h1,$h1,lsr#8
strb $h2,[$mac,#9]
mov $h2,$h2,lsr#8
strb $h3,[$mac,#13]
mov $h3,$h3,lsr#8
strb $h0,[$mac,#2]
mov $h0,$h0,lsr#8
strb $h1,[$mac,#6]
mov $h1,$h1,lsr#8
strb $h2,[$mac,#10]
mov $h2,$h2,lsr#8
strb $h3,[$mac,#14]
mov $h3,$h3,lsr#8
strb $h0,[$mac,#3]
strb $h1,[$mac,#7]
strb $h2,[$mac,#11]
strb $h3,[$mac,#15]
#endif
ldmia sp!,{r4-r11}
#if __ARM_ARCH__>=5
ret @ bx lr
#else
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
#endif
.size poly1305_emit,.-poly1305_emit
___
{
my ($R0,$R1,$S1,$R2,$S2,$R3,$S3,$R4,$S4) = map("d$_",(0..9));
my ($D0,$D1,$D2,$D3,$D4, $H0,$H1,$H2,$H3,$H4) = map("q$_",(5..14));
my ($T0,$T1,$MASK) = map("q$_",(15,4,0));
my ($in2,$zeros,$tbl0,$tbl1) = map("r$_",(4..7));
$code.=<<___;
#if __ARM_MAX_ARCH__>=7
.fpu neon
.type poly1305_init_neon,%function
.align 5
poly1305_init_neon:
ldr r4,[$ctx,#20] @ load key base 2^32
ldr r5,[$ctx,#24]
ldr r6,[$ctx,#28]
ldr r7,[$ctx,#32]
and r2,r4,#0x03ffffff @ base 2^32 -> base 2^26
mov r3,r4,lsr#26
mov r4,r5,lsr#20
orr r3,r3,r5,lsl#6
mov r5,r6,lsr#14
orr r4,r4,r6,lsl#12
mov r6,r7,lsr#8
orr r5,r5,r7,lsl#18
and r3,r3,#0x03ffffff
and r4,r4,#0x03ffffff
and r5,r5,#0x03ffffff
vdup.32 $R0,r2 @ r^1 in both lanes
add r2,r3,r3,lsl#2 @ *5
vdup.32 $R1,r3
add r3,r4,r4,lsl#2
vdup.32 $S1,r2
vdup.32 $R2,r4
add r4,r5,r5,lsl#2
vdup.32 $S2,r3
vdup.32 $R3,r5
add r5,r6,r6,lsl#2
vdup.32 $S3,r4
vdup.32 $R4,r6
vdup.32 $S4,r5
mov $zeros,#2 @ counter
.Lsquare_neon:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ d0 = h0*r0 + h4*5*r1 + h3*5*r2 + h2*5*r3 + h1*5*r4
@ d1 = h1*r0 + h0*r1 + h4*5*r2 + h3*5*r3 + h2*5*r4
@ d2 = h2*r0 + h1*r1 + h0*r2 + h4*5*r3 + h3*5*r4
@ d3 = h3*r0 + h2*r1 + h1*r2 + h0*r3 + h4*5*r4
@ d4 = h4*r0 + h3*r1 + h2*r2 + h1*r3 + h0*r4
vmull.u32 $D0,$R0,${R0}[1]
vmull.u32 $D1,$R1,${R0}[1]
vmull.u32 $D2,$R2,${R0}[1]
vmull.u32 $D3,$R3,${R0}[1]
vmull.u32 $D4,$R4,${R0}[1]
vmlal.u32 $D0,$R4,${S1}[1]
vmlal.u32 $D1,$R0,${R1}[1]
vmlal.u32 $D2,$R1,${R1}[1]
vmlal.u32 $D3,$R2,${R1}[1]
vmlal.u32 $D4,$R3,${R1}[1]
vmlal.u32 $D0,$R3,${S2}[1]
vmlal.u32 $D1,$R4,${S2}[1]
vmlal.u32 $D3,$R1,${R2}[1]
vmlal.u32 $D2,$R0,${R2}[1]
vmlal.u32 $D4,$R2,${R2}[1]
vmlal.u32 $D0,$R2,${S3}[1]
vmlal.u32 $D3,$R0,${R3}[1]
vmlal.u32 $D1,$R3,${S3}[1]
vmlal.u32 $D2,$R4,${S3}[1]
vmlal.u32 $D4,$R1,${R3}[1]
vmlal.u32 $D3,$R4,${S4}[1]
vmlal.u32 $D0,$R1,${S4}[1]
vmlal.u32 $D1,$R2,${S4}[1]
vmlal.u32 $D2,$R3,${S4}[1]
vmlal.u32 $D4,$R0,${R4}[1]
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ lazy reduction as discussed in "NEON crypto" by D.J. Bernstein
@ and P. Schwabe
@
@ H0>>+H1>>+H2>>+H3>>+H4
@ H3>>+H4>>*5+H0>>+H1
@
@ Trivia.
@
@ Result of multiplication of n-bit number by m-bit number is
@ n+m bits wide. However! Even though 2^n is a n+1-bit number,
@ m-bit number multiplied by 2^n is still n+m bits wide.
@
@ Sum of two n-bit numbers is n+1 bits wide, sum of three - n+2,
@ and so is sum of four. Sum of 2^m n-m-bit numbers and n-bit
@ one is n+1 bits wide.
@
@ >>+ denotes Hnext += Hn>>26, Hn &= 0x3ffffff. This means that
@ H0, H2, H3 are guaranteed to be 26 bits wide, while H1 and H4
@ can be 27. However! In cases when their width exceeds 26 bits
@ they are limited by 2^26+2^6. This in turn means that *sum*
@ of the products with these values can still be viewed as sum
@ of 52-bit numbers as long as the amount of addends is not a
@ power of 2. For example,
@
@ H4 = H4*R0 + H3*R1 + H2*R2 + H1*R3 + H0 * R4,
@
@ which can't be larger than 5 * (2^26 + 2^6) * (2^26 + 2^6), or
@ 5 * (2^52 + 2*2^32 + 2^12), which in turn is smaller than
@ 8 * (2^52) or 2^55. However, the value is then multiplied by
@ by 5, so we should be looking at 5 * 5 * (2^52 + 2^33 + 2^12),
@ which is less than 32 * (2^52) or 2^57. And when processing
@ data we are looking at triple as many addends...
@
@ In key setup procedure pre-reduced H0 is limited by 5*4+1 and
@ 5*H4 - by 5*5 52-bit addends, or 57 bits. But when hashing the
@ input H0 is limited by (5*4+1)*3 addends, or 58 bits, while
@ 5*H4 by 5*5*3, or 59[!] bits. How is this relevant? vmlal.u32
@ instruction accepts 2x32-bit input and writes 2x64-bit result.
@ This means that result of reduction have to be compressed upon
@ loop wrap-around. This can be done in the process of reduction
@ to minimize amount of instructions [as well as amount of
@ 128-bit instructions, which benefits low-end processors], but
@ one has to watch for H2 (which is narrower than H0) and 5*H4
@ not being wider than 58 bits, so that result of right shift
@ by 26 bits fits in 32 bits. This is also useful on x86,
@ because it allows to use paddd in place for paddq, which
@ benefits Atom, where paddq is ridiculously slow.
vshr.u64 $T0,$D3,#26
vmovn.i64 $D3#lo,$D3
vshr.u64 $T1,$D0,#26
vmovn.i64 $D0#lo,$D0
vadd.i64 $D4,$D4,$T0 @ h3 -> h4
vbic.i32 $D3#lo,#0xfc000000 @ &=0x03ffffff
vadd.i64 $D1,$D1,$T1 @ h0 -> h1
vbic.i32 $D0#lo,#0xfc000000
vshrn.u64 $T0#lo,$D4,#26
vmovn.i64 $D4#lo,$D4
vshr.u64 $T1,$D1,#26
vmovn.i64 $D1#lo,$D1
vadd.i64 $D2,$D2,$T1 @ h1 -> h2
vbic.i32 $D4#lo,#0xfc000000
vbic.i32 $D1#lo,#0xfc000000
vadd.i32 $D0#lo,$D0#lo,$T0#lo
vshl.u32 $T0#lo,$T0#lo,#2
vshrn.u64 $T1#lo,$D2,#26
vmovn.i64 $D2#lo,$D2
vadd.i32 $D0#lo,$D0#lo,$T0#lo @ h4 -> h0
vadd.i32 $D3#lo,$D3#lo,$T1#lo @ h2 -> h3
vbic.i32 $D2#lo,#0xfc000000
vshr.u32 $T0#lo,$D0#lo,#26
vbic.i32 $D0#lo,#0xfc000000
vshr.u32 $T1#lo,$D3#lo,#26
vbic.i32 $D3#lo,#0xfc000000
vadd.i32 $D1#lo,$D1#lo,$T0#lo @ h0 -> h1
vadd.i32 $D4#lo,$D4#lo,$T1#lo @ h3 -> h4
subs $zeros,$zeros,#1
beq .Lsquare_break_neon
add $tbl0,$ctx,#(48+0*9*4)
add $tbl1,$ctx,#(48+1*9*4)
vtrn.32 $R0,$D0#lo @ r^2:r^1
vtrn.32 $R2,$D2#lo
vtrn.32 $R3,$D3#lo
vtrn.32 $R1,$D1#lo
vtrn.32 $R4,$D4#lo
vshl.u32 $S2,$R2,#2 @ *5
vshl.u32 $S3,$R3,#2
vshl.u32 $S1,$R1,#2
vshl.u32 $S4,$R4,#2
vadd.i32 $S2,$S2,$R2
vadd.i32 $S1,$S1,$R1
vadd.i32 $S3,$S3,$R3
vadd.i32 $S4,$S4,$R4
vst4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]!
vst4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]!
vst4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
vst4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
vst1.32 {${S4}[0]},[$tbl0,:32]
vst1.32 {${S4}[1]},[$tbl1,:32]
b .Lsquare_neon
.align 4
.Lsquare_break_neon:
add $tbl0,$ctx,#(48+2*4*9)
add $tbl1,$ctx,#(48+3*4*9)
vmov $R0,$D0#lo @ r^4:r^3
vshl.u32 $S1,$D1#lo,#2 @ *5
vmov $R1,$D1#lo
vshl.u32 $S2,$D2#lo,#2
vmov $R2,$D2#lo
vshl.u32 $S3,$D3#lo,#2
vmov $R3,$D3#lo
vshl.u32 $S4,$D4#lo,#2
vmov $R4,$D4#lo
vadd.i32 $S1,$S1,$D1#lo
vadd.i32 $S2,$S2,$D2#lo
vadd.i32 $S3,$S3,$D3#lo
vadd.i32 $S4,$S4,$D4#lo
vst4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]!
vst4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]!
vst4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
vst4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
vst1.32 {${S4}[0]},[$tbl0]
vst1.32 {${S4}[1]},[$tbl1]
ret @ bx lr
.size poly1305_init_neon,.-poly1305_init_neon
.type poly1305_blocks_neon,%function
.align 5
poly1305_blocks_neon:
.Lpoly1305_blocks_neon:
ldr ip,[$ctx,#36] @ is_base2_26
ands $len,$len,#-16
beq .Lno_data_neon
cmp $len,#64
bhs .Lenter_neon
tst ip,ip @ is_base2_26?
beq .Lpoly1305_blocks
.Lenter_neon:
stmdb sp!,{r4-r7}
vstmdb sp!,{d8-d15} @ ABI specification says so
tst ip,ip @ is_base2_26?
bne .Lbase2_26_neon
stmdb sp!,{r1-r3,lr}
bl poly1305_init_neon
ldr r4,[$ctx,#0] @ load hash value base 2^32
ldr r5,[$ctx,#4]
ldr r6,[$ctx,#8]
ldr r7,[$ctx,#12]
ldr ip,[$ctx,#16]
and r2,r4,#0x03ffffff @ base 2^32 -> base 2^26
mov r3,r4,lsr#26
veor $D0#lo,$D0#lo,$D0#lo
mov r4,r5,lsr#20
orr r3,r3,r5,lsl#6
veor $D1#lo,$D1#lo,$D1#lo
mov r5,r6,lsr#14
orr r4,r4,r6,lsl#12
veor $D2#lo,$D2#lo,$D2#lo
mov r6,r7,lsr#8
orr r5,r5,r7,lsl#18
veor $D3#lo,$D3#lo,$D3#lo
and r3,r3,#0x03ffffff
orr r6,r6,ip,lsl#24
veor $D4#lo,$D4#lo,$D4#lo
and r4,r4,#0x03ffffff
mov r1,#1
and r5,r5,#0x03ffffff
str r1,[$ctx,#36] @ is_base2_26
vmov.32 $D0#lo[0],r2
vmov.32 $D1#lo[0],r3
vmov.32 $D2#lo[0],r4
vmov.32 $D3#lo[0],r5
vmov.32 $D4#lo[0],r6
adr $zeros,.Lzeros
ldmia sp!,{r1-r3,lr}
b .Lbase2_32_neon
.align 4
.Lbase2_26_neon:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ load hash value
veor $D0#lo,$D0#lo,$D0#lo
veor $D1#lo,$D1#lo,$D1#lo
veor $D2#lo,$D2#lo,$D2#lo
veor $D3#lo,$D3#lo,$D3#lo
veor $D4#lo,$D4#lo,$D4#lo
vld4.32 {$D0#lo[0],$D1#lo[0],$D2#lo[0],$D3#lo[0]},[$ctx]!
adr $zeros,.Lzeros
vld1.32 {$D4#lo[0]},[$ctx]
sub $ctx,$ctx,#16 @ rewind
.Lbase2_32_neon:
add $in2,$inp,#32
mov $padbit,$padbit,lsl#24
tst $len,#31
beq .Leven
vld4.32 {$H0#lo[0],$H1#lo[0],$H2#lo[0],$H3#lo[0]},[$inp]!
vmov.32 $H4#lo[0],$padbit
sub $len,$len,#16
add $in2,$inp,#32
# ifdef __ARMEB__
vrev32.8 $H0,$H0
vrev32.8 $H3,$H3
vrev32.8 $H1,$H1
vrev32.8 $H2,$H2
# endif
vsri.u32 $H4#lo,$H3#lo,#8 @ base 2^32 -> base 2^26
vshl.u32 $H3#lo,$H3#lo,#18
vsri.u32 $H3#lo,$H2#lo,#14
vshl.u32 $H2#lo,$H2#lo,#12
vadd.i32 $H4#hi,$H4#lo,$D4#lo @ add hash value and move to #hi
vbic.i32 $H3#lo,#0xfc000000
vsri.u32 $H2#lo,$H1#lo,#20
vshl.u32 $H1#lo,$H1#lo,#6
vbic.i32 $H2#lo,#0xfc000000
vsri.u32 $H1#lo,$H0#lo,#26
vadd.i32 $H3#hi,$H3#lo,$D3#lo
vbic.i32 $H0#lo,#0xfc000000
vbic.i32 $H1#lo,#0xfc000000
vadd.i32 $H2#hi,$H2#lo,$D2#lo
vadd.i32 $H0#hi,$H0#lo,$D0#lo
vadd.i32 $H1#hi,$H1#lo,$D1#lo
mov $tbl1,$zeros
add $tbl0,$ctx,#48
cmp $len,$len
b .Long_tail
.align 4
.Leven:
subs $len,$len,#64
it lo
movlo $in2,$zeros
vmov.i32 $H4,#1<<24 @ padbit, yes, always
vld4.32 {$H0#lo,$H1#lo,$H2#lo,$H3#lo},[$inp] @ inp[0:1]
add $inp,$inp,#64
vld4.32 {$H0#hi,$H1#hi,$H2#hi,$H3#hi},[$in2] @ inp[2:3] (or 0)
add $in2,$in2,#64
itt hi
addhi $tbl1,$ctx,#(48+1*9*4)
addhi $tbl0,$ctx,#(48+3*9*4)
# ifdef __ARMEB__
vrev32.8 $H0,$H0
vrev32.8 $H3,$H3
vrev32.8 $H1,$H1
vrev32.8 $H2,$H2
# endif
vsri.u32 $H4,$H3,#8 @ base 2^32 -> base 2^26
vshl.u32 $H3,$H3,#18
vsri.u32 $H3,$H2,#14
vshl.u32 $H2,$H2,#12
vbic.i32 $H3,#0xfc000000
vsri.u32 $H2,$H1,#20
vshl.u32 $H1,$H1,#6
vbic.i32 $H2,#0xfc000000
vsri.u32 $H1,$H0,#26
vbic.i32 $H0,#0xfc000000
vbic.i32 $H1,#0xfc000000
bls .Lskip_loop
vld4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]! @ load r^2
vld4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]! @ load r^4
vld4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
vld4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
b .Loop_neon
.align 5
.Loop_neon:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ ((inp[0]*r^4+inp[2]*r^2+inp[4])*r^4+inp[6]*r^2
@ ((inp[1]*r^4+inp[3]*r^2+inp[5])*r^3+inp[7]*r
@ \___________________/
@ ((inp[0]*r^4+inp[2]*r^2+inp[4])*r^4+inp[6]*r^2+inp[8])*r^2
@ ((inp[1]*r^4+inp[3]*r^2+inp[5])*r^4+inp[7]*r^2+inp[9])*r
@ \___________________/ \____________________/
@
@ Note that we start with inp[2:3]*r^2. This is because it
@ doesn't depend on reduction in previous iteration.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ d4 = h4*r0 + h3*r1 + h2*r2 + h1*r3 + h0*r4
@ d3 = h3*r0 + h2*r1 + h1*r2 + h0*r3 + h4*5*r4
@ d2 = h2*r0 + h1*r1 + h0*r2 + h4*5*r3 + h3*5*r4
@ d1 = h1*r0 + h0*r1 + h4*5*r2 + h3*5*r3 + h2*5*r4
@ d0 = h0*r0 + h4*5*r1 + h3*5*r2 + h2*5*r3 + h1*5*r4
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ inp[2:3]*r^2
vadd.i32 $H2#lo,$H2#lo,$D2#lo @ accumulate inp[0:1]
vmull.u32 $D2,$H2#hi,${R0}[1]
vadd.i32 $H0#lo,$H0#lo,$D0#lo
vmull.u32 $D0,$H0#hi,${R0}[1]
vadd.i32 $H3#lo,$H3#lo,$D3#lo
vmull.u32 $D3,$H3#hi,${R0}[1]
vmlal.u32 $D2,$H1#hi,${R1}[1]
vadd.i32 $H1#lo,$H1#lo,$D1#lo
vmull.u32 $D1,$H1#hi,${R0}[1]
vadd.i32 $H4#lo,$H4#lo,$D4#lo
vmull.u32 $D4,$H4#hi,${R0}[1]
subs $len,$len,#64
vmlal.u32 $D0,$H4#hi,${S1}[1]
it lo
movlo $in2,$zeros
vmlal.u32 $D3,$H2#hi,${R1}[1]
vld1.32 ${S4}[1],[$tbl1,:32]
vmlal.u32 $D1,$H0#hi,${R1}[1]
vmlal.u32 $D4,$H3#hi,${R1}[1]
vmlal.u32 $D0,$H3#hi,${S2}[1]
vmlal.u32 $D3,$H1#hi,${R2}[1]
vmlal.u32 $D4,$H2#hi,${R2}[1]
vmlal.u32 $D1,$H4#hi,${S2}[1]
vmlal.u32 $D2,$H0#hi,${R2}[1]
vmlal.u32 $D3,$H0#hi,${R3}[1]
vmlal.u32 $D0,$H2#hi,${S3}[1]
vmlal.u32 $D4,$H1#hi,${R3}[1]
vmlal.u32 $D1,$H3#hi,${S3}[1]
vmlal.u32 $D2,$H4#hi,${S3}[1]
vmlal.u32 $D3,$H4#hi,${S4}[1]
vmlal.u32 $D0,$H1#hi,${S4}[1]
vmlal.u32 $D4,$H0#hi,${R4}[1]
vmlal.u32 $D1,$H2#hi,${S4}[1]
vmlal.u32 $D2,$H3#hi,${S4}[1]
vld4.32 {$H0#hi,$H1#hi,$H2#hi,$H3#hi},[$in2] @ inp[2:3] (or 0)
add $in2,$in2,#64
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ (hash+inp[0:1])*r^4 and accumulate
vmlal.u32 $D3,$H3#lo,${R0}[0]
vmlal.u32 $D0,$H0#lo,${R0}[0]
vmlal.u32 $D4,$H4#lo,${R0}[0]
vmlal.u32 $D1,$H1#lo,${R0}[0]
vmlal.u32 $D2,$H2#lo,${R0}[0]
vld1.32 ${S4}[0],[$tbl0,:32]
vmlal.u32 $D3,$H2#lo,${R1}[0]
vmlal.u32 $D0,$H4#lo,${S1}[0]
vmlal.u32 $D4,$H3#lo,${R1}[0]
vmlal.u32 $D1,$H0#lo,${R1}[0]
vmlal.u32 $D2,$H1#lo,${R1}[0]
vmlal.u32 $D3,$H1#lo,${R2}[0]
vmlal.u32 $D0,$H3#lo,${S2}[0]
vmlal.u32 $D4,$H2#lo,${R2}[0]
vmlal.u32 $D1,$H4#lo,${S2}[0]
vmlal.u32 $D2,$H0#lo,${R2}[0]
vmlal.u32 $D3,$H0#lo,${R3}[0]
vmlal.u32 $D0,$H2#lo,${S3}[0]
vmlal.u32 $D4,$H1#lo,${R3}[0]
vmlal.u32 $D1,$H3#lo,${S3}[0]
vmlal.u32 $D3,$H4#lo,${S4}[0]
vmlal.u32 $D2,$H4#lo,${S3}[0]
vmlal.u32 $D0,$H1#lo,${S4}[0]
vmlal.u32 $D4,$H0#lo,${R4}[0]
vmov.i32 $H4,#1<<24 @ padbit, yes, always
vmlal.u32 $D1,$H2#lo,${S4}[0]
vmlal.u32 $D2,$H3#lo,${S4}[0]
vld4.32 {$H0#lo,$H1#lo,$H2#lo,$H3#lo},[$inp] @ inp[0:1]
add $inp,$inp,#64
# ifdef __ARMEB__
vrev32.8 $H0,$H0
vrev32.8 $H1,$H1
vrev32.8 $H2,$H2
vrev32.8 $H3,$H3
# endif
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ lazy reduction interleaved with base 2^32 -> base 2^26 of
@ inp[0:3] previously loaded to $H0-$H3 and smashed to $H0-$H4.
vshr.u64 $T0,$D3,#26
vmovn.i64 $D3#lo,$D3
vshr.u64 $T1,$D0,#26
vmovn.i64 $D0#lo,$D0
vadd.i64 $D4,$D4,$T0 @ h3 -> h4
vbic.i32 $D3#lo,#0xfc000000
vsri.u32 $H4,$H3,#8 @ base 2^32 -> base 2^26
vadd.i64 $D1,$D1,$T1 @ h0 -> h1
vshl.u32 $H3,$H3,#18
vbic.i32 $D0#lo,#0xfc000000
vshrn.u64 $T0#lo,$D4,#26
vmovn.i64 $D4#lo,$D4
vshr.u64 $T1,$D1,#26
vmovn.i64 $D1#lo,$D1
vadd.i64 $D2,$D2,$T1 @ h1 -> h2
vsri.u32 $H3,$H2,#14
vbic.i32 $D4#lo,#0xfc000000
vshl.u32 $H2,$H2,#12
vbic.i32 $D1#lo,#0xfc000000
vadd.i32 $D0#lo,$D0#lo,$T0#lo
vshl.u32 $T0#lo,$T0#lo,#2
vbic.i32 $H3,#0xfc000000
vshrn.u64 $T1#lo,$D2,#26
vmovn.i64 $D2#lo,$D2
vaddl.u32 $D0,$D0#lo,$T0#lo @ h4 -> h0 [widen for a sec]
vsri.u32 $H2,$H1,#20
vadd.i32 $D3#lo,$D3#lo,$T1#lo @ h2 -> h3
vshl.u32 $H1,$H1,#6
vbic.i32 $D2#lo,#0xfc000000
vbic.i32 $H2,#0xfc000000
vshrn.u64 $T0#lo,$D0,#26 @ re-narrow
vmovn.i64 $D0#lo,$D0
vsri.u32 $H1,$H0,#26
vbic.i32 $H0,#0xfc000000
vshr.u32 $T1#lo,$D3#lo,#26
vbic.i32 $D3#lo,#0xfc000000
vbic.i32 $D0#lo,#0xfc000000
vadd.i32 $D1#lo,$D1#lo,$T0#lo @ h0 -> h1
vadd.i32 $D4#lo,$D4#lo,$T1#lo @ h3 -> h4
vbic.i32 $H1,#0xfc000000
bhi .Loop_neon
.Lskip_loop:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ multiply (inp[0:1]+hash) or inp[2:3] by r^2:r^1
add $tbl1,$ctx,#(48+0*9*4)
add $tbl0,$ctx,#(48+1*9*4)
adds $len,$len,#32
it ne
movne $len,#0
bne .Long_tail
vadd.i32 $H2#hi,$H2#lo,$D2#lo @ add hash value and move to #hi
vadd.i32 $H0#hi,$H0#lo,$D0#lo
vadd.i32 $H3#hi,$H3#lo,$D3#lo
vadd.i32 $H1#hi,$H1#lo,$D1#lo
vadd.i32 $H4#hi,$H4#lo,$D4#lo
.Long_tail:
vld4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]! @ load r^1
vld4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]! @ load r^2
vadd.i32 $H2#lo,$H2#lo,$D2#lo @ can be redundant
vmull.u32 $D2,$H2#hi,$R0
vadd.i32 $H0#lo,$H0#lo,$D0#lo
vmull.u32 $D0,$H0#hi,$R0
vadd.i32 $H3#lo,$H3#lo,$D3#lo
vmull.u32 $D3,$H3#hi,$R0
vadd.i32 $H1#lo,$H1#lo,$D1#lo
vmull.u32 $D1,$H1#hi,$R0
vadd.i32 $H4#lo,$H4#lo,$D4#lo
vmull.u32 $D4,$H4#hi,$R0
vmlal.u32 $D0,$H4#hi,$S1
vld4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
vmlal.u32 $D3,$H2#hi,$R1
vld4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
vmlal.u32 $D1,$H0#hi,$R1
vmlal.u32 $D4,$H3#hi,$R1
vmlal.u32 $D2,$H1#hi,$R1
vmlal.u32 $D3,$H1#hi,$R2
vld1.32 ${S4}[1],[$tbl1,:32]
vmlal.u32 $D0,$H3#hi,$S2
vld1.32 ${S4}[0],[$tbl0,:32]
vmlal.u32 $D4,$H2#hi,$R2
vmlal.u32 $D1,$H4#hi,$S2
vmlal.u32 $D2,$H0#hi,$R2
vmlal.u32 $D3,$H0#hi,$R3
it ne
addne $tbl1,$ctx,#(48+2*9*4)
vmlal.u32 $D0,$H2#hi,$S3
it ne
addne $tbl0,$ctx,#(48+3*9*4)
vmlal.u32 $D4,$H1#hi,$R3
vmlal.u32 $D1,$H3#hi,$S3
vmlal.u32 $D2,$H4#hi,$S3
vmlal.u32 $D3,$H4#hi,$S4
vorn $MASK,$MASK,$MASK @ all-ones, can be redundant
vmlal.u32 $D0,$H1#hi,$S4
vshr.u64 $MASK,$MASK,#38
vmlal.u32 $D4,$H0#hi,$R4
vmlal.u32 $D1,$H2#hi,$S4
vmlal.u32 $D2,$H3#hi,$S4
beq .Lshort_tail
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ (hash+inp[0:1])*r^4:r^3 and accumulate
vld4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]! @ load r^3
vld4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]! @ load r^4
vmlal.u32 $D2,$H2#lo,$R0
vmlal.u32 $D0,$H0#lo,$R0
vmlal.u32 $D3,$H3#lo,$R0
vmlal.u32 $D1,$H1#lo,$R0
vmlal.u32 $D4,$H4#lo,$R0
vmlal.u32 $D0,$H4#lo,$S1
vld4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
vmlal.u32 $D3,$H2#lo,$R1
vld4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
vmlal.u32 $D1,$H0#lo,$R1
vmlal.u32 $D4,$H3#lo,$R1
vmlal.u32 $D2,$H1#lo,$R1
vmlal.u32 $D3,$H1#lo,$R2
vld1.32 ${S4}[1],[$tbl1,:32]
vmlal.u32 $D0,$H3#lo,$S2
vld1.32 ${S4}[0],[$tbl0,:32]
vmlal.u32 $D4,$H2#lo,$R2
vmlal.u32 $D1,$H4#lo,$S2
vmlal.u32 $D2,$H0#lo,$R2
vmlal.u32 $D3,$H0#lo,$R3
vmlal.u32 $D0,$H2#lo,$S3
vmlal.u32 $D4,$H1#lo,$R3
vmlal.u32 $D1,$H3#lo,$S3
vmlal.u32 $D2,$H4#lo,$S3
vmlal.u32 $D3,$H4#lo,$S4
vorn $MASK,$MASK,$MASK @ all-ones
vmlal.u32 $D0,$H1#lo,$S4
vshr.u64 $MASK,$MASK,#38
vmlal.u32 $D4,$H0#lo,$R4
vmlal.u32 $D1,$H2#lo,$S4
vmlal.u32 $D2,$H3#lo,$S4
.Lshort_tail:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ horizontal addition
vadd.i64 $D3#lo,$D3#lo,$D3#hi
vadd.i64 $D0#lo,$D0#lo,$D0#hi
vadd.i64 $D4#lo,$D4#lo,$D4#hi
vadd.i64 $D1#lo,$D1#lo,$D1#hi
vadd.i64 $D2#lo,$D2#lo,$D2#hi
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ lazy reduction, but without narrowing
vshr.u64 $T0,$D3,#26
vand.i64 $D3,$D3,$MASK
vshr.u64 $T1,$D0,#26
vand.i64 $D0,$D0,$MASK
vadd.i64 $D4,$D4,$T0 @ h3 -> h4
vadd.i64 $D1,$D1,$T1 @ h0 -> h1
vshr.u64 $T0,$D4,#26
vand.i64 $D4,$D4,$MASK
vshr.u64 $T1,$D1,#26
vand.i64 $D1,$D1,$MASK
vadd.i64 $D2,$D2,$T1 @ h1 -> h2
vadd.i64 $D0,$D0,$T0
vshl.u64 $T0,$T0,#2
vshr.u64 $T1,$D2,#26
vand.i64 $D2,$D2,$MASK
vadd.i64 $D0,$D0,$T0 @ h4 -> h0
vadd.i64 $D3,$D3,$T1 @ h2 -> h3
vshr.u64 $T0,$D0,#26
vand.i64 $D0,$D0,$MASK
vshr.u64 $T1,$D3,#26
vand.i64 $D3,$D3,$MASK
vadd.i64 $D1,$D1,$T0 @ h0 -> h1
vadd.i64 $D4,$D4,$T1 @ h3 -> h4
cmp $len,#0
bne .Leven
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ store hash value
vst4.32 {$D0#lo[0],$D1#lo[0],$D2#lo[0],$D3#lo[0]},[$ctx]!
vst1.32 {$D4#lo[0]},[$ctx]
vldmia sp!,{d8-d15} @ epilogue
ldmia sp!,{r4-r7}
.Lno_data_neon:
ret @ bx lr
.size poly1305_blocks_neon,.-poly1305_blocks_neon
.type poly1305_emit_neon,%function
.align 5
poly1305_emit_neon:
.Lpoly1305_emit_neon:
ldr ip,[$ctx,#36] @ is_base2_26
stmdb sp!,{r4-r11}
tst ip,ip
beq .Lpoly1305_emit_enter
ldmia $ctx,{$h0-$h4}
eor $g0,$g0,$g0
adds $h0,$h0,$h1,lsl#26 @ base 2^26 -> base 2^32
mov $h1,$h1,lsr#6
adcs $h1,$h1,$h2,lsl#20
mov $h2,$h2,lsr#12
adcs $h2,$h2,$h3,lsl#14
mov $h3,$h3,lsr#18
adcs $h3,$h3,$h4,lsl#8
adc $h4,$g0,$h4,lsr#24 @ can be partially reduced ...
and $g0,$h4,#-4 @ ... so reduce
and $h4,$h3,#3
add $g0,$g0,$g0,lsr#2 @ *= 5
adds $h0,$h0,$g0
adcs $h1,$h1,#0
adcs $h2,$h2,#0
adcs $h3,$h3,#0
adc $h4,$h4,#0
adds $g0,$h0,#5 @ compare to modulus
adcs $g1,$h1,#0
adcs $g2,$h2,#0
adcs $g3,$h3,#0
adc $g4,$h4,#0
tst $g4,#4 @ did it carry/borrow?
it ne
movne $h0,$g0
ldr $g0,[$nonce,#0]
it ne
movne $h1,$g1
ldr $g1,[$nonce,#4]
it ne
movne $h2,$g2
ldr $g2,[$nonce,#8]
it ne
movne $h3,$g3
ldr $g3,[$nonce,#12]
adds $h0,$h0,$g0 @ accumulate nonce
adcs $h1,$h1,$g1
adcs $h2,$h2,$g2
adc $h3,$h3,$g3
# ifdef __ARMEB__
rev $h0,$h0
rev $h1,$h1
rev $h2,$h2
rev $h3,$h3
# endif
str $h0,[$mac,#0] @ store the result
str $h1,[$mac,#4]
str $h2,[$mac,#8]
str $h3,[$mac,#12]
ldmia sp!,{r4-r11}
ret @ bx lr
.size poly1305_emit_neon,.-poly1305_emit_neon
.align 5
.Lzeros:
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.LOPENSSL_armcap:
# ifdef _WIN32
.word OPENSSL_armcap_P
# else
.word OPENSSL_armcap_P-.Lpoly1305_init
# endif
#endif
___
} }
$code.=<<___;
.asciz "Poly1305 for ARMv4/NEON, CRYPTOGAMS by <appro\@openssl.org>"
.align 2
#if __ARM_MAX_ARCH__>=7
.comm OPENSSL_armcap_P,4,4
#endif
___
foreach (split("\n",$code)) {
s/\`([^\`]*)\`/eval $1/geo;
s/\bq([0-9]+)#(lo|hi)/sprintf "d%d",2*$1+($2 eq "hi")/geo or
s/\bret\b/bx lr/go or
s/\bbx\s+lr\b/.word\t0xe12fff1e/go; # make it possible to compile with -march=armv4
print $_,"\n";
}
close STDOUT; # enforce flush
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