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chacha-armv4.pl
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chacha-armv4.pl
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#! /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 2014
#
# ChaCha20 for ARMv4.
#
# Performance in cycles per byte out of large buffer.
#
# IALU/gcc-4.4 1xNEON 3xNEON+1xIALU
#
# Cortex-A5 19.3(*)/+95% 21.8 14.1
# Cortex-A8 10.5(*)/+160% 13.9 6.35
# Cortex-A9 12.9(**)/+110% 14.3 6.50
# Cortex-A15 11.0/+40% 16.0 5.00
# Snapdragon S4 11.5/+125% 13.6 4.90
#
# (*) most "favourable" result for aligned data on little-endian
# processor, result for misaligned data is 10-15% lower;
# (**) this result is a trade-off: it can be improved by 20%,
# but then Snapdragon S4 and Cortex-A8 results get
# 20-25% worse;
$flavour = shift;
if ($flavour=~/\w[\w\-]*\.\w+$/) { $output=$flavour; undef $flavour; }
else { while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {} }
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 $output";
} else {
open STDOUT,">$output";
}
sub AUTOLOAD() # thunk [simplified] x86-style perlasm
{ my $opcode = $AUTOLOAD; $opcode =~ s/.*:://; $opcode =~ s/_/\./;
my $arg = pop;
$arg = "#$arg" if ($arg*1 eq $arg);
$code .= "\t$opcode\t".join(',',@_,$arg)."\n";
}
my @x=map("r$_",(0..7,"x","x","x","x",12,"x",14,"x"));
my @t=map("r$_",(8..11));
sub ROUND {
my ($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 $odd = $d0&1;
my ($xc,$xc_) = (@t[0..1]);
my ($xd,$xd_) = $odd ? (@t[2],@x[$d1]) : (@x[$d0],@t[2]);
my @ret;
# Consider order in which variables are addressed by their
# index:
#
# a b c d
#
# 0 4 8 12 < even round
# 1 5 9 13
# 2 6 10 14
# 3 7 11 15
# 0 5 10 15 < odd round
# 1 6 11 12
# 2 7 8 13
# 3 4 9 14
#
# 'a', 'b' are permanently allocated in registers, @x[0..7],
# while 'c's and pair of 'd's are maintained in memory. If
# you observe 'c' column, you'll notice that pair of 'c's is
# invariant between rounds. This means that we have to reload
# them once per round, in the middle. This is why you'll see
# bunch of 'c' stores and loads in the middle, but none in
# the beginning or end. If you observe 'd' column, you'll
# notice that 15 and 13 are reused in next pair of rounds.
# This is why these two are chosen for offloading to memory,
# to make loads count more.
push @ret,(
"&add (@x[$a0],@x[$a0],@x[$b0])",
"&mov ($xd,$xd,'ror#16')",
"&add (@x[$a1],@x[$a1],@x[$b1])",
"&mov ($xd_,$xd_,'ror#16')",
"&eor ($xd,$xd,@x[$a0],'ror#16')",
"&eor ($xd_,$xd_,@x[$a1],'ror#16')",
"&add ($xc,$xc,$xd)",
"&mov (@x[$b0],@x[$b0],'ror#20')",
"&add ($xc_,$xc_,$xd_)",
"&mov (@x[$b1],@x[$b1],'ror#20')",
"&eor (@x[$b0],@x[$b0],$xc,'ror#20')",
"&eor (@x[$b1],@x[$b1],$xc_,'ror#20')",
"&add (@x[$a0],@x[$a0],@x[$b0])",
"&mov ($xd,$xd,'ror#24')",
"&add (@x[$a1],@x[$a1],@x[$b1])",
"&mov ($xd_,$xd_,'ror#24')",
"&eor ($xd,$xd,@x[$a0],'ror#24')",
"&eor ($xd_,$xd_,@x[$a1],'ror#24')",
"&add ($xc,$xc,$xd)",
"&mov (@x[$b0],@x[$b0],'ror#25')" );
push @ret,(
"&str ($xd,'[sp,#4*(16+$d0)]')",
"&ldr ($xd,'[sp,#4*(16+$d2)]')" ) if ($odd);
push @ret,(
"&add ($xc_,$xc_,$xd_)",
"&mov (@x[$b1],@x[$b1],'ror#25')" );
push @ret,(
"&str ($xd_,'[sp,#4*(16+$d1)]')",
"&ldr ($xd_,'[sp,#4*(16+$d3)]')" ) if (!$odd);
push @ret,(
"&eor (@x[$b0],@x[$b0],$xc,'ror#25')",
"&eor (@x[$b1],@x[$b1],$xc_,'ror#25')" );
$xd=@x[$d2] if (!$odd);
$xd_=@x[$d3] if ($odd);
push @ret,(
"&str ($xc,'[sp,#4*(16+$c0)]')",
"&ldr ($xc,'[sp,#4*(16+$c2)]')",
"&add (@x[$a2],@x[$a2],@x[$b2])",
"&mov ($xd,$xd,'ror#16')",
"&str ($xc_,'[sp,#4*(16+$c1)]')",
"&ldr ($xc_,'[sp,#4*(16+$c3)]')",
"&add (@x[$a3],@x[$a3],@x[$b3])",
"&mov ($xd_,$xd_,'ror#16')",
"&eor ($xd,$xd,@x[$a2],'ror#16')",
"&eor ($xd_,$xd_,@x[$a3],'ror#16')",
"&add ($xc,$xc,$xd)",
"&mov (@x[$b2],@x[$b2],'ror#20')",
"&add ($xc_,$xc_,$xd_)",
"&mov (@x[$b3],@x[$b3],'ror#20')",
"&eor (@x[$b2],@x[$b2],$xc,'ror#20')",
"&eor (@x[$b3],@x[$b3],$xc_,'ror#20')",
"&add (@x[$a2],@x[$a2],@x[$b2])",
"&mov ($xd,$xd,'ror#24')",
"&add (@x[$a3],@x[$a3],@x[$b3])",
"&mov ($xd_,$xd_,'ror#24')",
"&eor ($xd,$xd,@x[$a2],'ror#24')",
"&eor ($xd_,$xd_,@x[$a3],'ror#24')",
"&add ($xc,$xc,$xd)",
"&mov (@x[$b2],@x[$b2],'ror#25')",
"&add ($xc_,$xc_,$xd_)",
"&mov (@x[$b3],@x[$b3],'ror#25')",
"&eor (@x[$b2],@x[$b2],$xc,'ror#25')",
"&eor (@x[$b3],@x[$b3],$xc_,'ror#25')" );
@ret;
}
$code.=<<___;
#include "arm_arch.h"
.text
#if defined(__thumb2__) || defined(__clang__)
.syntax unified
#endif
#if defined(__thumb2__)
.thumb
#else
.code 32
#endif
#if defined(__thumb2__) || defined(__clang__)
#define ldrhsb ldrbhs
#endif
.align 5
.Lsigma:
.long 0x61707865,0x3320646e,0x79622d32,0x6b206574 @ endian-neutral
.Lone:
.long 1,0,0,0
#if __ARM_MAX_ARCH__>=7
.LOPENSSL_armcap:
.word OPENSSL_armcap_P-.LChaCha20_ctr32
#else
.word -1
#endif
.globl ChaCha20_ctr32
.type ChaCha20_ctr32,%function
.align 5
ChaCha20_ctr32:
.LChaCha20_ctr32:
ldr r12,[sp,#0] @ pull pointer to counter and nonce
stmdb sp!,{r0-r2,r4-r11,lr}
#if __ARM_ARCH__<7 && !defined(__thumb2__)
sub r14,pc,#16 @ ChaCha20_ctr32
#else
adr r14,.LChaCha20_ctr32
#endif
cmp r2,#0 @ len==0?
#ifdef __thumb2__
itt eq
#endif
addeq sp,sp,#4*3
beq .Lno_data
#if __ARM_MAX_ARCH__>=7
cmp r2,#192 @ test len
bls .Lshort
ldr r4,[r14,#-32]
ldr r4,[r14,r4]
# ifdef __APPLE__
ldr r4,[r4]
# endif
tst r4,#ARMV7_NEON
bne .LChaCha20_neon
.Lshort:
#endif
ldmia r12,{r4-r7} @ load counter and nonce
sub sp,sp,#4*(16) @ off-load area
sub r14,r14,#64 @ .Lsigma
stmdb sp!,{r4-r7} @ copy counter and nonce
ldmia r3,{r4-r11} @ load key
ldmia r14,{r0-r3} @ load sigma
stmdb sp!,{r4-r11} @ copy key
stmdb sp!,{r0-r3} @ copy sigma
str r10,[sp,#4*(16+10)] @ off-load "@x[10]"
str r11,[sp,#4*(16+11)] @ off-load "@x[11]"
b .Loop_outer_enter
.align 4
.Loop_outer:
ldmia sp,{r0-r9} @ load key material
str @t[3],[sp,#4*(32+2)] @ save len
str r12, [sp,#4*(32+1)] @ save inp
str r14, [sp,#4*(32+0)] @ save out
.Loop_outer_enter:
ldr @t[3], [sp,#4*(15)]
ldr @x[12],[sp,#4*(12)] @ modulo-scheduled load
ldr @t[2], [sp,#4*(13)]
ldr @x[14],[sp,#4*(14)]
str @t[3], [sp,#4*(16+15)]
mov @t[3],#10
b .Loop
.align 4
.Loop:
subs @t[3],@t[3],#1
___
foreach (&ROUND(0, 4, 8,12)) { eval; }
foreach (&ROUND(0, 5,10,15)) { eval; }
$code.=<<___;
bne .Loop
ldr @t[3],[sp,#4*(32+2)] @ load len
str @t[0], [sp,#4*(16+8)] @ modulo-scheduled store
str @t[1], [sp,#4*(16+9)]
str @x[12],[sp,#4*(16+12)]
str @t[2], [sp,#4*(16+13)]
str @x[14],[sp,#4*(16+14)]
@ at this point we have first half of 512-bit result in
@ @x[0-7] and second half at sp+4*(16+8)
cmp @t[3],#64 @ done yet?
#ifdef __thumb2__
itete lo
#endif
addlo r12,sp,#4*(0) @ shortcut or ...
ldrhs r12,[sp,#4*(32+1)] @ ... load inp
addlo r14,sp,#4*(0) @ shortcut or ...
ldrhs r14,[sp,#4*(32+0)] @ ... load out
ldr @t[0],[sp,#4*(0)] @ load key material
ldr @t[1],[sp,#4*(1)]
#if __ARM_ARCH__>=6 || !defined(__ARMEB__)
# if __ARM_ARCH__<7
orr @t[2],r12,r14
tst @t[2],#3 @ are input and output aligned?
ldr @t[2],[sp,#4*(2)]
bne .Lunaligned
cmp @t[3],#64 @ restore flags
# else
ldr @t[2],[sp,#4*(2)]
# endif
ldr @t[3],[sp,#4*(3)]
add @x[0],@x[0],@t[0] @ accumulate key material
add @x[1],@x[1],@t[1]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[0],[r12],#16 @ load input
ldrhs @t[1],[r12,#-12]
add @x[2],@x[2],@t[2]
add @x[3],@x[3],@t[3]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[2],[r12,#-8]
ldrhs @t[3],[r12,#-4]
# if __ARM_ARCH__>=6 && defined(__ARMEB__)
rev @x[0],@x[0]
rev @x[1],@x[1]
rev @x[2],@x[2]
rev @x[3],@x[3]
# endif
# ifdef __thumb2__
itt hs
# endif
eorhs @x[0],@x[0],@t[0] @ xor with input
eorhs @x[1],@x[1],@t[1]
add @t[0],sp,#4*(4)
str @x[0],[r14],#16 @ store output
# ifdef __thumb2__
itt hs
# endif
eorhs @x[2],@x[2],@t[2]
eorhs @x[3],@x[3],@t[3]
ldmia @t[0],{@t[0]-@t[3]} @ load key material
str @x[1],[r14,#-12]
str @x[2],[r14,#-8]
str @x[3],[r14,#-4]
add @x[4],@x[4],@t[0] @ accumulate key material
add @x[5],@x[5],@t[1]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[0],[r12],#16 @ load input
ldrhs @t[1],[r12,#-12]
add @x[6],@x[6],@t[2]
add @x[7],@x[7],@t[3]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[2],[r12,#-8]
ldrhs @t[3],[r12,#-4]
# if __ARM_ARCH__>=6 && defined(__ARMEB__)
rev @x[4],@x[4]
rev @x[5],@x[5]
rev @x[6],@x[6]
rev @x[7],@x[7]
# endif
# ifdef __thumb2__
itt hs
# endif
eorhs @x[4],@x[4],@t[0]
eorhs @x[5],@x[5],@t[1]
add @t[0],sp,#4*(8)
str @x[4],[r14],#16 @ store output
# ifdef __thumb2__
itt hs
# endif
eorhs @x[6],@x[6],@t[2]
eorhs @x[7],@x[7],@t[3]
str @x[5],[r14,#-12]
ldmia @t[0],{@t[0]-@t[3]} @ load key material
str @x[6],[r14,#-8]
add @x[0],sp,#4*(16+8)
str @x[7],[r14,#-4]
ldmia @x[0],{@x[0]-@x[7]} @ load second half
add @x[0],@x[0],@t[0] @ accumulate key material
add @x[1],@x[1],@t[1]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[0],[r12],#16 @ load input
ldrhs @t[1],[r12,#-12]
# ifdef __thumb2__
itt hi
# endif
strhi @t[2],[sp,#4*(16+10)] @ copy "@x[10]" while at it
strhi @t[3],[sp,#4*(16+11)] @ copy "@x[11]" while at it
add @x[2],@x[2],@t[2]
add @x[3],@x[3],@t[3]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[2],[r12,#-8]
ldrhs @t[3],[r12,#-4]
# if __ARM_ARCH__>=6 && defined(__ARMEB__)
rev @x[0],@x[0]
rev @x[1],@x[1]
rev @x[2],@x[2]
rev @x[3],@x[3]
# endif
# ifdef __thumb2__
itt hs
# endif
eorhs @x[0],@x[0],@t[0]
eorhs @x[1],@x[1],@t[1]
add @t[0],sp,#4*(12)
str @x[0],[r14],#16 @ store output
# ifdef __thumb2__
itt hs
# endif
eorhs @x[2],@x[2],@t[2]
eorhs @x[3],@x[3],@t[3]
str @x[1],[r14,#-12]
ldmia @t[0],{@t[0]-@t[3]} @ load key material
str @x[2],[r14,#-8]
str @x[3],[r14,#-4]
add @x[4],@x[4],@t[0] @ accumulate key material
add @x[5],@x[5],@t[1]
# ifdef __thumb2__
itt hi
# endif
addhi @t[0],@t[0],#1 @ next counter value
strhi @t[0],[sp,#4*(12)] @ save next counter value
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[0],[r12],#16 @ load input
ldrhs @t[1],[r12,#-12]
add @x[6],@x[6],@t[2]
add @x[7],@x[7],@t[3]
# ifdef __thumb2__
itt hs
# endif
ldrhs @t[2],[r12,#-8]
ldrhs @t[3],[r12,#-4]
# if __ARM_ARCH__>=6 && defined(__ARMEB__)
rev @x[4],@x[4]
rev @x[5],@x[5]
rev @x[6],@x[6]
rev @x[7],@x[7]
# endif
# ifdef __thumb2__
itt hs
# endif
eorhs @x[4],@x[4],@t[0]
eorhs @x[5],@x[5],@t[1]
# ifdef __thumb2__
it ne
# endif
ldrne @t[0],[sp,#4*(32+2)] @ re-load len
# ifdef __thumb2__
itt hs
# endif
eorhs @x[6],@x[6],@t[2]
eorhs @x[7],@x[7],@t[3]
str @x[4],[r14],#16 @ store output
str @x[5],[r14,#-12]
# ifdef __thumb2__
it hs
# endif
subhs @t[3],@t[0],#64 @ len-=64
str @x[6],[r14,#-8]
str @x[7],[r14,#-4]
bhi .Loop_outer
beq .Ldone
# if __ARM_ARCH__<7
b .Ltail
.align 4
.Lunaligned: @ unaligned endian-neutral path
cmp @t[3],#64 @ restore flags
# endif
#endif
#if __ARM_ARCH__<7
ldr @t[3],[sp,#4*(3)]
___
for ($i=0;$i<16;$i+=4) {
my $j=$i&0x7;
$code.=<<___ if ($i==4);
add @x[0],sp,#4*(16+8)
___
$code.=<<___ if ($i==8);
ldmia @x[0],{@x[0]-@x[7]} @ load second half
# ifdef __thumb2__
itt hi
# endif
strhi @t[2],[sp,#4*(16+10)] @ copy "@x[10]"
strhi @t[3],[sp,#4*(16+11)] @ copy "@x[11]"
___
$code.=<<___;
add @x[$j+0],@x[$j+0],@t[0] @ accumulate key material
___
$code.=<<___ if ($i==12);
# ifdef __thumb2__
itt hi
# endif
addhi @t[0],@t[0],#1 @ next counter value
strhi @t[0],[sp,#4*(12)] @ save next counter value
___
$code.=<<___;
add @x[$j+1],@x[$j+1],@t[1]
add @x[$j+2],@x[$j+2],@t[2]
# ifdef __thumb2__
itete lo
# endif
eorlo @t[0],@t[0],@t[0] @ zero or ...
ldrhsb @t[0],[r12],#16 @ ... load input
eorlo @t[1],@t[1],@t[1]
ldrhsb @t[1],[r12,#-12]
add @x[$j+3],@x[$j+3],@t[3]
# ifdef __thumb2__
itete lo
# endif
eorlo @t[2],@t[2],@t[2]
ldrhsb @t[2],[r12,#-8]
eorlo @t[3],@t[3],@t[3]
ldrhsb @t[3],[r12,#-4]
eor @x[$j+0],@t[0],@x[$j+0] @ xor with input (or zero)
eor @x[$j+1],@t[1],@x[$j+1]
# ifdef __thumb2__
itt hs
# endif
ldrhsb @t[0],[r12,#-15] @ load more input
ldrhsb @t[1],[r12,#-11]
eor @x[$j+2],@t[2],@x[$j+2]
strb @x[$j+0],[r14],#16 @ store output
eor @x[$j+3],@t[3],@x[$j+3]
# ifdef __thumb2__
itt hs
# endif
ldrhsb @t[2],[r12,#-7]
ldrhsb @t[3],[r12,#-3]
strb @x[$j+1],[r14,#-12]
eor @x[$j+0],@t[0],@x[$j+0],lsr#8
strb @x[$j+2],[r14,#-8]
eor @x[$j+1],@t[1],@x[$j+1],lsr#8
# ifdef __thumb2__
itt hs
# endif
ldrhsb @t[0],[r12,#-14] @ load more input
ldrhsb @t[1],[r12,#-10]
strb @x[$j+3],[r14,#-4]
eor @x[$j+2],@t[2],@x[$j+2],lsr#8
strb @x[$j+0],[r14,#-15]
eor @x[$j+3],@t[3],@x[$j+3],lsr#8
# ifdef __thumb2__
itt hs
# endif
ldrhsb @t[2],[r12,#-6]
ldrhsb @t[3],[r12,#-2]
strb @x[$j+1],[r14,#-11]
eor @x[$j+0],@t[0],@x[$j+0],lsr#8
strb @x[$j+2],[r14,#-7]
eor @x[$j+1],@t[1],@x[$j+1],lsr#8
# ifdef __thumb2__
itt hs
# endif
ldrhsb @t[0],[r12,#-13] @ load more input
ldrhsb @t[1],[r12,#-9]
strb @x[$j+3],[r14,#-3]
eor @x[$j+2],@t[2],@x[$j+2],lsr#8
strb @x[$j+0],[r14,#-14]
eor @x[$j+3],@t[3],@x[$j+3],lsr#8
# ifdef __thumb2__
itt hs
# endif
ldrhsb @t[2],[r12,#-5]
ldrhsb @t[3],[r12,#-1]
strb @x[$j+1],[r14,#-10]
strb @x[$j+2],[r14,#-6]
eor @x[$j+0],@t[0],@x[$j+0],lsr#8
strb @x[$j+3],[r14,#-2]
eor @x[$j+1],@t[1],@x[$j+1],lsr#8
strb @x[$j+0],[r14,#-13]
eor @x[$j+2],@t[2],@x[$j+2],lsr#8
strb @x[$j+1],[r14,#-9]
eor @x[$j+3],@t[3],@x[$j+3],lsr#8
strb @x[$j+2],[r14,#-5]
strb @x[$j+3],[r14,#-1]
___
$code.=<<___ if ($i<12);
add @t[0],sp,#4*(4+$i)
ldmia @t[0],{@t[0]-@t[3]} @ load key material
___
}
$code.=<<___;
# ifdef __thumb2__
it ne
# endif
ldrne @t[0],[sp,#4*(32+2)] @ re-load len
# ifdef __thumb2__
it hs
# endif
subhs @t[3],@t[0],#64 @ len-=64
bhi .Loop_outer
beq .Ldone
#endif
.Ltail:
ldr r12,[sp,#4*(32+1)] @ load inp
add @t[1],sp,#4*(0)
ldr r14,[sp,#4*(32+0)] @ load out
.Loop_tail:
ldrb @t[2],[@t[1]],#1 @ read buffer on stack
ldrb @t[3],[r12],#1 @ read input
subs @t[0],@t[0],#1
eor @t[3],@t[3],@t[2]
strb @t[3],[r14],#1 @ store output
bne .Loop_tail
.Ldone:
add sp,sp,#4*(32+3)
.Lno_data:
ldmia sp!,{r4-r11,pc}
.size ChaCha20_ctr32,.-ChaCha20_ctr32
___
{{{
my ($a0,$b0,$c0,$d0,$a1,$b1,$c1,$d1,$a2,$b2,$c2,$d2,$t0,$t1,$t2,$t3) =
map("q$_",(0..15));
sub NEONROUND {
my $odd = pop;
my ($a,$b,$c,$d,$t)=@_;
(
"&vadd_i32 ($a,$a,$b)",
"&veor ($d,$d,$a)",
"&vrev32_16 ($d,$d)", # vrot ($d,16)
"&vadd_i32 ($c,$c,$d)",
"&veor ($t,$b,$c)",
"&vshr_u32 ($b,$t,20)",
"&vsli_32 ($b,$t,12)",
"&vadd_i32 ($a,$a,$b)",
"&veor ($t,$d,$a)",
"&vshr_u32 ($d,$t,24)",
"&vsli_32 ($d,$t,8)",
"&vadd_i32 ($c,$c,$d)",
"&veor ($t,$b,$c)",
"&vshr_u32 ($b,$t,25)",
"&vsli_32 ($b,$t,7)",
"&vext_8 ($c,$c,$c,8)",
"&vext_8 ($b,$b,$b,$odd?12:4)",
"&vext_8 ($d,$d,$d,$odd?4:12)"
);
}
$code.=<<___;
#if __ARM_MAX_ARCH__>=7
.arch armv7-a
.fpu neon
.type ChaCha20_neon,%function
.align 5
ChaCha20_neon:
ldr r12,[sp,#0] @ pull pointer to counter and nonce
stmdb sp!,{r0-r2,r4-r11,lr}
.LChaCha20_neon:
adr r14,.Lsigma
vstmdb sp!,{d8-d15} @ ABI spec says so
stmdb sp!,{r0-r3}
vld1.32 {$b0-$c0},[r3] @ load key
ldmia r3,{r4-r11} @ load key
sub sp,sp,#4*(16+16)
vld1.32 {$d0},[r12] @ load counter and nonce
add r12,sp,#4*8
ldmia r14,{r0-r3} @ load sigma
vld1.32 {$a0},[r14]! @ load sigma
vld1.32 {$t0},[r14] @ one
vst1.32 {$c0-$d0},[r12] @ copy 1/2key|counter|nonce
vst1.32 {$a0-$b0},[sp] @ copy sigma|1/2key
str r10,[sp,#4*(16+10)] @ off-load "@x[10]"
str r11,[sp,#4*(16+11)] @ off-load "@x[11]"
vshl.i32 $t1#lo,$t0#lo,#1 @ two
vstr $t0#lo,[sp,#4*(16+0)]
vshl.i32 $t2#lo,$t0#lo,#2 @ four
vstr $t1#lo,[sp,#4*(16+2)]
vmov $a1,$a0
vstr $t2#lo,[sp,#4*(16+4)]
vmov $a2,$a0
vmov $b1,$b0
vmov $b2,$b0
b .Loop_neon_enter
.align 4
.Loop_neon_outer:
ldmia sp,{r0-r9} @ load key material
cmp @t[3],#64*2 @ if len<=64*2
bls .Lbreak_neon @ switch to integer-only
vmov $a1,$a0
str @t[3],[sp,#4*(32+2)] @ save len
vmov $a2,$a0
str r12, [sp,#4*(32+1)] @ save inp
vmov $b1,$b0
str r14, [sp,#4*(32+0)] @ save out
vmov $b2,$b0
.Loop_neon_enter:
ldr @t[3], [sp,#4*(15)]
vadd.i32 $d1,$d0,$t0 @ counter+1
ldr @x[12],[sp,#4*(12)] @ modulo-scheduled load
vmov $c1,$c0
ldr @t[2], [sp,#4*(13)]
vmov $c2,$c0
ldr @x[14],[sp,#4*(14)]
vadd.i32 $d2,$d1,$t0 @ counter+2
str @t[3], [sp,#4*(16+15)]
mov @t[3],#10
add @x[12],@x[12],#3 @ counter+3
b .Loop_neon
.align 4
.Loop_neon:
subs @t[3],@t[3],#1
___
my @thread0=&NEONROUND($a0,$b0,$c0,$d0,$t0,0);
my @thread1=&NEONROUND($a1,$b1,$c1,$d1,$t1,0);
my @thread2=&NEONROUND($a2,$b2,$c2,$d2,$t2,0);
my @thread3=&ROUND(0,4,8,12);
foreach (@thread0) {
eval; eval(shift(@thread3));
eval(shift(@thread1)); eval(shift(@thread3));
eval(shift(@thread2)); eval(shift(@thread3));
}
@thread0=&NEONROUND($a0,$b0,$c0,$d0,$t0,1);
@thread1=&NEONROUND($a1,$b1,$c1,$d1,$t1,1);
@thread2=&NEONROUND($a2,$b2,$c2,$d2,$t2,1);
@thread3=&ROUND(0,5,10,15);
foreach (@thread0) {
eval; eval(shift(@thread3));
eval(shift(@thread1)); eval(shift(@thread3));
eval(shift(@thread2)); eval(shift(@thread3));
}
$code.=<<___;
bne .Loop_neon
add @t[3],sp,#32
vld1.32 {$t0-$t1},[sp] @ load key material
vld1.32 {$t2-$t3},[@t[3]]
ldr @t[3],[sp,#4*(32+2)] @ load len
str @t[0], [sp,#4*(16+8)] @ modulo-scheduled store
str @t[1], [sp,#4*(16+9)]
str @x[12],[sp,#4*(16+12)]
str @t[2], [sp,#4*(16+13)]
str @x[14],[sp,#4*(16+14)]
@ at this point we have first half of 512-bit result in
@ @x[0-7] and second half at sp+4*(16+8)
ldr r12,[sp,#4*(32+1)] @ load inp
ldr r14,[sp,#4*(32+0)] @ load out
vadd.i32 $a0,$a0,$t0 @ accumulate key material
vadd.i32 $a1,$a1,$t0
vadd.i32 $a2,$a2,$t0
vldr $t0#lo,[sp,#4*(16+0)] @ one
vadd.i32 $b0,$b0,$t1
vadd.i32 $b1,$b1,$t1
vadd.i32 $b2,$b2,$t1
vldr $t1#lo,[sp,#4*(16+2)] @ two
vadd.i32 $c0,$c0,$t2
vadd.i32 $c1,$c1,$t2
vadd.i32 $c2,$c2,$t2
vadd.i32 $d1#lo,$d1#lo,$t0#lo @ counter+1
vadd.i32 $d2#lo,$d2#lo,$t1#lo @ counter+2
vadd.i32 $d0,$d0,$t3
vadd.i32 $d1,$d1,$t3
vadd.i32 $d2,$d2,$t3
cmp @t[3],#64*4
blo .Ltail_neon
vld1.8 {$t0-$t1},[r12]! @ load input
mov @t[3],sp
vld1.8 {$t2-$t3},[r12]!
veor $a0,$a0,$t0 @ xor with input
veor $b0,$b0,$t1
vld1.8 {$t0-$t1},[r12]!
veor $c0,$c0,$t2
veor $d0,$d0,$t3
vld1.8 {$t2-$t3},[r12]!
veor $a1,$a1,$t0
vst1.8 {$a0-$b0},[r14]! @ store output
veor $b1,$b1,$t1
vld1.8 {$t0-$t1},[r12]!
veor $c1,$c1,$t2
vst1.8 {$c0-$d0},[r14]!
veor $d1,$d1,$t3
vld1.8 {$t2-$t3},[r12]!
veor $a2,$a2,$t0
vld1.32 {$a0-$b0},[@t[3]]! @ load for next iteration
veor $t0#hi,$t0#hi,$t0#hi
vldr $t0#lo,[sp,#4*(16+4)] @ four
veor $b2,$b2,$t1
vld1.32 {$c0-$d0},[@t[3]]
veor $c2,$c2,$t2
vst1.8 {$a1-$b1},[r14]!
veor $d2,$d2,$t3
vst1.8 {$c1-$d1},[r14]!
vadd.i32 $d0#lo,$d0#lo,$t0#lo @ next counter value
vldr $t0#lo,[sp,#4*(16+0)] @ one
ldmia sp,{@t[0]-@t[3]} @ load key material
add @x[0],@x[0],@t[0] @ accumulate key material
ldr @t[0],[r12],#16 @ load input
vst1.8 {$a2-$b2},[r14]!
add @x[1],@x[1],@t[1]
ldr @t[1],[r12,#-12]
vst1.8 {$c2-$d2},[r14]!
add @x[2],@x[2],@t[2]
ldr @t[2],[r12,#-8]
add @x[3],@x[3],@t[3]
ldr @t[3],[r12,#-4]
# ifdef __ARMEB__
rev @x[0],@x[0]
rev @x[1],@x[1]
rev @x[2],@x[2]
rev @x[3],@x[3]
# endif
eor @x[0],@x[0],@t[0] @ xor with input
add @t[0],sp,#4*(4)
eor @x[1],@x[1],@t[1]
str @x[0],[r14],#16 @ store output
eor @x[2],@x[2],@t[2]
str @x[1],[r14,#-12]
eor @x[3],@x[3],@t[3]
ldmia @t[0],{@t[0]-@t[3]} @ load key material
str @x[2],[r14,#-8]
str @x[3],[r14,#-4]
add @x[4],@x[4],@t[0] @ accumulate key material
ldr @t[0],[r12],#16 @ load input
add @x[5],@x[5],@t[1]
ldr @t[1],[r12,#-12]
add @x[6],@x[6],@t[2]
ldr @t[2],[r12,#-8]
add @x[7],@x[7],@t[3]
ldr @t[3],[r12,#-4]
# ifdef __ARMEB__
rev @x[4],@x[4]
rev @x[5],@x[5]
rev @x[6],@x[6]
rev @x[7],@x[7]
# endif
eor @x[4],@x[4],@t[0]
add @t[0],sp,#4*(8)
eor @x[5],@x[5],@t[1]
str @x[4],[r14],#16 @ store output
eor @x[6],@x[6],@t[2]
str @x[5],[r14,#-12]
eor @x[7],@x[7],@t[3]
ldmia @t[0],{@t[0]-@t[3]} @ load key material
str @x[6],[r14,#-8]
add @x[0],sp,#4*(16+8)
str @x[7],[r14,#-4]
ldmia @x[0],{@x[0]-@x[7]} @ load second half
add @x[0],@x[0],@t[0] @ accumulate key material
ldr @t[0],[r12],#16 @ load input
add @x[1],@x[1],@t[1]
ldr @t[1],[r12,#-12]
# ifdef __thumb2__
it hi
# endif
strhi @t[2],[sp,#4*(16+10)] @ copy "@x[10]" while at it
add @x[2],@x[2],@t[2]
ldr @t[2],[r12,#-8]
# ifdef __thumb2__
it hi
# endif
strhi @t[3],[sp,#4*(16+11)] @ copy "@x[11]" while at it
add @x[3],@x[3],@t[3]
ldr @t[3],[r12,#-4]
# ifdef __ARMEB__
rev @x[0],@x[0]
rev @x[1],@x[1]
rev @x[2],@x[2]
rev @x[3],@x[3]
# endif
eor @x[0],@x[0],@t[0]
add @t[0],sp,#4*(12)
eor @x[1],@x[1],@t[1]
str @x[0],[r14],#16 @ store output
eor @x[2],@x[2],@t[2]
str @x[1],[r14,#-12]
eor @x[3],@x[3],@t[3]
ldmia @t[0],{@t[0]-@t[3]} @ load key material
str @x[2],[r14,#-8]
str @x[3],[r14,#-4]
add @x[4],@x[4],@t[0] @ accumulate key material
add @t[0],@t[0],#4 @ next counter value
add @x[5],@x[5],@t[1]
str @t[0],[sp,#4*(12)] @ save next counter value
ldr @t[0],[r12],#16 @ load input
add @x[6],@x[6],@t[2]
add @x[4],@x[4],#3 @ counter+3
ldr @t[1],[r12,#-12]
add @x[7],@x[7],@t[3]
ldr @t[2],[r12,#-8]
ldr @t[3],[r12,#-4]
# ifdef __ARMEB__
rev @x[4],@x[4]
rev @x[5],@x[5]
rev @x[6],@x[6]
rev @x[7],@x[7]
# endif
eor @x[4],@x[4],@t[0]
# ifdef __thumb2__
it hi
# endif
ldrhi @t[0],[sp,#4*(32+2)] @ re-load len
eor @x[5],@x[5],@t[1]
eor @x[6],@x[6],@t[2]
str @x[4],[r14],#16 @ store output
eor @x[7],@x[7],@t[3]
str @x[5],[r14,#-12]
sub @t[3],@t[0],#64*4 @ len-=64*4
str @x[6],[r14,#-8]
str @x[7],[r14,#-4]
bhi .Loop_neon_outer
b .Ldone_neon
.align 4
.Lbreak_neon:
@ harmonize NEON and integer-only stack frames: load data
@ from NEON frame, but save to integer-only one; distance
@ between the two is 4*(32+4+16-32)=4*(20).
str @t[3], [sp,#4*(20+32+2)] @ save len
add @t[3],sp,#4*(32+4)
str r12, [sp,#4*(20+32+1)] @ save inp
str r14, [sp,#4*(20+32+0)] @ save out
ldr @x[12],[sp,#4*(16+10)]
ldr @x[14],[sp,#4*(16+11)]
vldmia @t[3],{d8-d15} @ fulfill ABI requirement
str @x[12],[sp,#4*(20+16+10)] @ copy "@x[10]"
str @x[14],[sp,#4*(20+16+11)] @ copy "@x[11]"
ldr @t[3], [sp,#4*(15)]
ldr @x[12],[sp,#4*(12)] @ modulo-scheduled load
ldr @t[2], [sp,#4*(13)]
ldr @x[14],[sp,#4*(14)]
str @t[3], [sp,#4*(20+16+15)]
add @t[3],sp,#4*(20)
vst1.32 {$a0-$b0},[@t[3]]! @ copy key
add sp,sp,#4*(20) @ switch frame
vst1.32 {$c0-$d0},[@t[3]]
mov @t[3],#10
b .Loop @ go integer-only
.align 4
.Ltail_neon:
cmp @t[3],#64*3
bhs .L192_or_more_neon
cmp @t[3],#64*2
bhs .L128_or_more_neon
cmp @t[3],#64*1
bhs .L64_or_more_neon
add @t[0],sp,#4*(8)
vst1.8 {$a0-$b0},[sp]
add @t[2],sp,#4*(0)
vst1.8 {$c0-$d0},[@t[0]]
b .Loop_tail_neon
.align 4
.L64_or_more_neon:
vld1.8 {$t0-$t1},[r12]!
vld1.8 {$t2-$t3},[r12]!