[PATCH net-next v6 06/23] zinc: port Andy Polyakov's ChaCha20 ARM and ARM64 implementations

From: Jason A. Donenfeld
Date: Tue Sep 25 2018 - 10:57:04 EST

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These port and prepare Andy Polyakov's implementations for the kernel,
but don't actually wire up any of the code yet. The wiring will be done
in a subsequent commit, since we'll need to merge these implementations
with another one. We make a few small changes to the assembly:

- Entries and exits use the proper kernel convention macro.
- CPU feature checking is done in C by the glue code, so that has been
removed from the assembly.
- The function names have been renamed to fit kernel conventions.
- Labels have been renamed (prefixed with .L) to fit kernel conventions.
- Constants have been rearranged so that they are closer to the code
that is using them. [ARM only]
- The neon code can jump to the scalar code when it makes sense to do
so.
- The neon_512 function as a separate function has been removed, leaving
the decision up to the main neon entry point. [ARM64 only]

Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Cc: Samuel Neves <sneves@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jean-Philippe Aumasson <jeanphilippe.aumasson@xxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
---
lib/zinc/chacha20/chacha20-arm-cryptogams.S | 367 +++++++++---------
lib/zinc/chacha20/chacha20-arm64-cryptogams.S | 57 +--
2 files changed, 193 insertions(+), 231 deletions(-)

diff --git a/lib/zinc/chacha20/chacha20-arm-cryptogams.S b/lib/zinc/chacha20/chacha20-arm-cryptogams.S
index 05a3a9e6e93f..770bab469171 100644
--- a/lib/zinc/chacha20/chacha20-arm-cryptogams.S
+++ b/lib/zinc/chacha20/chacha20-arm-cryptogams.S
@@ -1,9 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@xxxxxxxxx>. All Rights Reserved.
* Copyright (C) 2006-2017 CRYPTOGAMS by <appro@xxxxxxxxxxx>. All Rights Reserved.
+ *
+ * This is based in part on Andy Polyakov's implementation from CRYPTOGAMS.
*/

-#include "arm_arch.h"
+#include <linux/linkage.h>

.text
#if defined(__thumb2__) || defined(__clang__)
@@ -24,48 +27,25 @@
.long 0x61707865,0x3320646e,0x79622d32,0x6b206574 @ endian-neutral
.Lone:
.long 1,0,0,0
-.Lrot8:
-.long 0x02010003,0x06050407
-#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:
+ENTRY(chacha20_arm)
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__
+#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,#-24]
- ldr r4,[r14,r4]
-# ifdef __APPLE__
- ldr r4,[r4]
-# endif
- tst r4,#ARMV7_NEON
- bne .LChaCha20_neon
-.Lshort:
-#endif
+ beq .Lno_data_arm
ldmia r12,{r4-r7} @ load counter and nonce
sub sp,sp,#4*(16) @ off-load area
- sub r14,r14,#64 @ .Lsigma
+#if __LINUX_ARM_ARCH__ < 7 && !defined(__thumb2__)
+ sub r14,pc,#100 @ .Lsigma
+#else
+ adr r14,.Lsigma @ .Lsigma
+#endif
stmdb sp!,{r4-r7} @ copy counter and nonce
ldmia r3,{r4-r11} @ load key
ldmia r14,{r0-r3} @ load sigma
@@ -191,7 +171,7 @@ ChaCha20_ctr32:
@ rx and second half at sp+4*(16+8)

cmp r11,#64 @ done yet?
-#ifdef __thumb2__
+#ifdef __thumb2__
itete lo
#endif
addlo r12,sp,#4*(0) @ shortcut or ...
@@ -202,49 +182,49 @@ ChaCha20_ctr32:
ldr r8,[sp,#4*(0)] @ load key material
ldr r9,[sp,#4*(1)]

-#if __ARM_ARCH__>=6 || !defined(__ARMEB__)
-# if __ARM_ARCH__<7
+#if __LINUX_ARM_ARCH__ >= 6 || !defined(__ARMEB__)
+#if __LINUX_ARM_ARCH__ < 7
orr r10,r12,r14
tst r10,#3 @ are input and output aligned?
ldr r10,[sp,#4*(2)]
bne .Lunaligned
cmp r11,#64 @ restore flags
-# else
+#else
ldr r10,[sp,#4*(2)]
-# endif
+#endif
ldr r11,[sp,#4*(3)]

add r0,r0,r8 @ accumulate key material
add r1,r1,r9
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r8,[r12],#16 @ load input
ldrhs r9,[r12,#-12]

add r2,r2,r10
add r3,r3,r11
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r10,[r12,#-8]
ldrhs r11,[r12,#-4]
-# if __ARM_ARCH__>=6 && defined(__ARMEB__)
+#if __LINUX_ARM_ARCH__ >= 6 && defined(__ARMEB__)
rev r0,r0
rev r1,r1
rev r2,r2
rev r3,r3
-# endif
-# ifdef __thumb2__
+#endif
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r0,r0,r8 @ xor with input
eorhs r1,r1,r9
add r8,sp,#4*(4)
str r0,[r14],#16 @ store output
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r2,r2,r10
eorhs r3,r3,r11
ldmia r8,{r8-r11} @ load key material
@@ -254,34 +234,34 @@ ChaCha20_ctr32:

add r4,r8,r4,ror#13 @ accumulate key material
add r5,r9,r5,ror#13
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r8,[r12],#16 @ load input
ldrhs r9,[r12,#-12]
add r6,r10,r6,ror#13
add r7,r11,r7,ror#13
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r10,[r12,#-8]
ldrhs r11,[r12,#-4]
-# if __ARM_ARCH__>=6 && defined(__ARMEB__)
+#if __LINUX_ARM_ARCH__ >= 6 && defined(__ARMEB__)
rev r4,r4
rev r5,r5
rev r6,r6
rev r7,r7
-# endif
-# ifdef __thumb2__
+#endif
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r4,r4,r8
eorhs r5,r5,r9
add r8,sp,#4*(8)
str r4,[r14],#16 @ store output
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r6,r6,r10
eorhs r7,r7,r11
str r5,[r14,#-12]
@@ -294,39 +274,39 @@ ChaCha20_ctr32:

add r0,r0,r8 @ accumulate key material
add r1,r1,r9
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r8,[r12],#16 @ load input
ldrhs r9,[r12,#-12]
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hi
-# endif
+#endif
strhi r10,[sp,#4*(16+10)] @ copy "rx" while at it
strhi r11,[sp,#4*(16+11)] @ copy "rx" while at it
add r2,r2,r10
add r3,r3,r11
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r10,[r12,#-8]
ldrhs r11,[r12,#-4]
-# if __ARM_ARCH__>=6 && defined(__ARMEB__)
+#if __LINUX_ARM_ARCH__ >= 6 && defined(__ARMEB__)
rev r0,r0
rev r1,r1
rev r2,r2
rev r3,r3
-# endif
-# ifdef __thumb2__
+#endif
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r0,r0,r8
eorhs r1,r1,r9
add r8,sp,#4*(12)
str r0,[r14],#16 @ store output
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r2,r2,r10
eorhs r3,r3,r11
str r1,[r14,#-12]
@@ -336,79 +316,79 @@ ChaCha20_ctr32:

add r4,r8,r4,ror#24 @ accumulate key material
add r5,r9,r5,ror#24
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hi
-# endif
+#endif
addhi r8,r8,#1 @ next counter value
strhi r8,[sp,#4*(12)] @ save next counter value
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r8,[r12],#16 @ load input
ldrhs r9,[r12,#-12]
add r6,r10,r6,ror#24
add r7,r11,r7,ror#24
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhs r10,[r12,#-8]
ldrhs r11,[r12,#-4]
-# if __ARM_ARCH__>=6 && defined(__ARMEB__)
+#if __LINUX_ARM_ARCH__ >= 6 && defined(__ARMEB__)
rev r4,r4
rev r5,r5
rev r6,r6
rev r7,r7
-# endif
-# ifdef __thumb2__
+#endif
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r4,r4,r8
eorhs r5,r5,r9
-# ifdef __thumb2__
+#ifdef __thumb2__
it ne
-# endif
+#endif
ldrne r8,[sp,#4*(32+2)] @ re-load len
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
eorhs r6,r6,r10
eorhs r7,r7,r11
str r4,[r14],#16 @ store output
str r5,[r14,#-12]
-# ifdef __thumb2__
+#ifdef __thumb2__
it hs
-# endif
+#endif
subhs r11,r8,#64 @ len-=64
str r6,[r14,#-8]
str r7,[r14,#-4]
bhi .Loop_outer

beq .Ldone
-# if __ARM_ARCH__<7
+#if __LINUX_ARM_ARCH__ < 7
b .Ltail

.align 4
.Lunaligned: @ unaligned endian-neutral path
cmp r11,#64 @ restore flags
-# endif
#endif
-#if __ARM_ARCH__<7
+#endif
+#if __LINUX_ARM_ARCH__ < 7
ldr r11,[sp,#4*(3)]
add r0,r8,r0 @ accumulate key material
add r1,r9,r1
add r2,r10,r2
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r8,r8,r8 @ zero or ...
ldrhsb r8,[r12],#16 @ ... load input
eorlo r9,r9,r9
ldrhsb r9,[r12,#-12]

add r3,r11,r3
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r10,r10,r10
ldrhsb r10,[r12,#-8]
eorlo r11,r11,r11
@@ -416,53 +396,53 @@ ChaCha20_ctr32:

eor r0,r8,r0 @ xor with input (or zero)
eor r1,r9,r1
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-15] @ load more input
ldrhsb r9,[r12,#-11]
eor r2,r10,r2
strb r0,[r14],#16 @ store output
eor r3,r11,r3
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-7]
ldrhsb r11,[r12,#-3]
strb r1,[r14,#-12]
eor r0,r8,r0,lsr#8
strb r2,[r14,#-8]
eor r1,r9,r1,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-14] @ load more input
ldrhsb r9,[r12,#-10]
strb r3,[r14,#-4]
eor r2,r10,r2,lsr#8
strb r0,[r14,#-15]
eor r3,r11,r3,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-6]
ldrhsb r11,[r12,#-2]
strb r1,[r14,#-11]
eor r0,r8,r0,lsr#8
strb r2,[r14,#-7]
eor r1,r9,r1,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-13] @ load more input
ldrhsb r9,[r12,#-9]
strb r3,[r14,#-3]
eor r2,r10,r2,lsr#8
strb r0,[r14,#-14]
eor r3,r11,r3,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-5]
ldrhsb r11,[r12,#-1]
strb r1,[r14,#-10]
@@ -482,18 +462,18 @@ ChaCha20_ctr32:
add r4,r8,r4,ror#13 @ accumulate key material
add r5,r9,r5,ror#13
add r6,r10,r6,ror#13
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r8,r8,r8 @ zero or ...
ldrhsb r8,[r12],#16 @ ... load input
eorlo r9,r9,r9
ldrhsb r9,[r12,#-12]

add r7,r11,r7,ror#13
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r10,r10,r10
ldrhsb r10,[r12,#-8]
eorlo r11,r11,r11
@@ -501,53 +481,53 @@ ChaCha20_ctr32:

eor r4,r8,r4 @ xor with input (or zero)
eor r5,r9,r5
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-15] @ load more input
ldrhsb r9,[r12,#-11]
eor r6,r10,r6
strb r4,[r14],#16 @ store output
eor r7,r11,r7
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-7]
ldrhsb r11,[r12,#-3]
strb r5,[r14,#-12]
eor r4,r8,r4,lsr#8
strb r6,[r14,#-8]
eor r5,r9,r5,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-14] @ load more input
ldrhsb r9,[r12,#-10]
strb r7,[r14,#-4]
eor r6,r10,r6,lsr#8
strb r4,[r14,#-15]
eor r7,r11,r7,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-6]
ldrhsb r11,[r12,#-2]
strb r5,[r14,#-11]
eor r4,r8,r4,lsr#8
strb r6,[r14,#-7]
eor r5,r9,r5,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-13] @ load more input
ldrhsb r9,[r12,#-9]
strb r7,[r14,#-3]
eor r6,r10,r6,lsr#8
strb r4,[r14,#-14]
eor r7,r11,r7,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-5]
ldrhsb r11,[r12,#-1]
strb r5,[r14,#-10]
@@ -564,26 +544,26 @@ ChaCha20_ctr32:
add r8,sp,#4*(4+4)
ldmia r8,{r8-r11} @ load key material
ldmia r0,{r0-r7} @ load second half
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hi
-# endif
+#endif
strhi r10,[sp,#4*(16+10)] @ copy "rx"
strhi r11,[sp,#4*(16+11)] @ copy "rx"
add r0,r8,r0 @ accumulate key material
add r1,r9,r1
add r2,r10,r2
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r8,r8,r8 @ zero or ...
ldrhsb r8,[r12],#16 @ ... load input
eorlo r9,r9,r9
ldrhsb r9,[r12,#-12]

add r3,r11,r3
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r10,r10,r10
ldrhsb r10,[r12,#-8]
eorlo r11,r11,r11
@@ -591,53 +571,53 @@ ChaCha20_ctr32:

eor r0,r8,r0 @ xor with input (or zero)
eor r1,r9,r1
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-15] @ load more input
ldrhsb r9,[r12,#-11]
eor r2,r10,r2
strb r0,[r14],#16 @ store output
eor r3,r11,r3
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-7]
ldrhsb r11,[r12,#-3]
strb r1,[r14,#-12]
eor r0,r8,r0,lsr#8
strb r2,[r14,#-8]
eor r1,r9,r1,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-14] @ load more input
ldrhsb r9,[r12,#-10]
strb r3,[r14,#-4]
eor r2,r10,r2,lsr#8
strb r0,[r14,#-15]
eor r3,r11,r3,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-6]
ldrhsb r11,[r12,#-2]
strb r1,[r14,#-11]
eor r0,r8,r0,lsr#8
strb r2,[r14,#-7]
eor r1,r9,r1,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-13] @ load more input
ldrhsb r9,[r12,#-9]
strb r3,[r14,#-3]
eor r2,r10,r2,lsr#8
strb r0,[r14,#-14]
eor r3,r11,r3,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-5]
ldrhsb r11,[r12,#-1]
strb r1,[r14,#-10]
@@ -654,25 +634,25 @@ ChaCha20_ctr32:
add r8,sp,#4*(4+8)
ldmia r8,{r8-r11} @ load key material
add r4,r8,r4,ror#24 @ accumulate key material
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hi
-# endif
+#endif
addhi r8,r8,#1 @ next counter value
strhi r8,[sp,#4*(12)] @ save next counter value
add r5,r9,r5,ror#24
add r6,r10,r6,ror#24
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r8,r8,r8 @ zero or ...
ldrhsb r8,[r12],#16 @ ... load input
eorlo r9,r9,r9
ldrhsb r9,[r12,#-12]

add r7,r11,r7,ror#24
-# ifdef __thumb2__
+#ifdef __thumb2__
itete lo
-# endif
+#endif
eorlo r10,r10,r10
ldrhsb r10,[r12,#-8]
eorlo r11,r11,r11
@@ -680,53 +660,53 @@ ChaCha20_ctr32:

eor r4,r8,r4 @ xor with input (or zero)
eor r5,r9,r5
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-15] @ load more input
ldrhsb r9,[r12,#-11]
eor r6,r10,r6
strb r4,[r14],#16 @ store output
eor r7,r11,r7
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-7]
ldrhsb r11,[r12,#-3]
strb r5,[r14,#-12]
eor r4,r8,r4,lsr#8
strb r6,[r14,#-8]
eor r5,r9,r5,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-14] @ load more input
ldrhsb r9,[r12,#-10]
strb r7,[r14,#-4]
eor r6,r10,r6,lsr#8
strb r4,[r14,#-15]
eor r7,r11,r7,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-6]
ldrhsb r11,[r12,#-2]
strb r5,[r14,#-11]
eor r4,r8,r4,lsr#8
strb r6,[r14,#-7]
eor r5,r9,r5,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r8,[r12,#-13] @ load more input
ldrhsb r9,[r12,#-9]
strb r7,[r14,#-3]
eor r6,r10,r6,lsr#8
strb r4,[r14,#-14]
eor r7,r11,r7,lsr#8
-# ifdef __thumb2__
+#ifdef __thumb2__
itt hs
-# endif
+#endif
ldrhsb r10,[r12,#-5]
ldrhsb r11,[r12,#-1]
strb r5,[r14,#-10]
@@ -740,13 +720,13 @@ ChaCha20_ctr32:
eor r7,r11,r7,lsr#8
strb r6,[r14,#-5]
strb r7,[r14,#-1]
-# ifdef __thumb2__
+#ifdef __thumb2__
it ne
-# endif
+#endif
ldrne r8,[sp,#4*(32+2)] @ re-load len
-# ifdef __thumb2__
+#ifdef __thumb2__
it hs
-# endif
+#endif
subhs r11,r8,#64 @ len-=64
bhi .Loop_outer

@@ -768,20 +748,33 @@ ChaCha20_ctr32:

.Ldone:
add sp,sp,#4*(32+3)
-.Lno_data:
+.Lno_data_arm:
ldmia sp!,{r4-r11,pc}
-.size ChaCha20_ctr32,.-ChaCha20_ctr32
-#if __ARM_MAX_ARCH__>=7
+ENDPROC(chacha20_arm)
+
+#ifdef CONFIG_KERNEL_MODE_NEON
+.align 5
+.Lsigma2:
+.long 0x61707865,0x3320646e,0x79622d32,0x6b206574 @ endian-neutral
+.Lone2:
+.long 1,0,0,0
+.word -1
+
.arch armv7-a
.fpu neon

-.type ChaCha20_neon,%function
.align 5
-ChaCha20_neon:
+ENTRY(chacha20_neon)
ldr r12,[sp,#0] @ pull pointer to counter and nonce
stmdb sp!,{r0-r2,r4-r11,lr}
-.LChaCha20_neon:
- adr r14,.Lsigma
+ cmp r2,#0 @ len==0?
+#ifdef __thumb2__
+ itt eq
+#endif
+ addeq sp,sp,#4*3
+ beq .Lno_data_neon
+.Lchacha20_neon_begin:
+ adr r14,.Lsigma2
vstmdb sp!,{d8-d15} @ ABI spec says so
stmdb sp!,{r0-r3}

@@ -1121,12 +1114,12 @@ ChaCha20_neon:
ldr r10,[r12,#-8]
add r3,r3,r11
ldr r11,[r12,#-4]
-# ifdef __ARMEB__
+#ifdef __ARMEB__
rev r0,r0
rev r1,r1
rev r2,r2
rev r3,r3
-# endif
+#endif
eor r0,r0,r8 @ xor with input
add r8,sp,#4*(4)
eor r1,r1,r9
@@ -1146,12 +1139,12 @@ ChaCha20_neon:
ldr r10,[r12,#-8]
add r7,r11,r7,ror#13
ldr r11,[r12,#-4]
-# ifdef __ARMEB__
+#ifdef __ARMEB__
rev r4,r4
rev r5,r5
rev r6,r6
rev r7,r7
-# endif
+#endif
eor r4,r4,r8
add r8,sp,#4*(8)
eor r5,r5,r9
@@ -1170,24 +1163,24 @@ ChaCha20_neon:
ldr r8,[r12],#16 @ load input
add r1,r1,r9
ldr r9,[r12,#-12]
-# ifdef __thumb2__
+#ifdef __thumb2__
it hi
-# endif
+#endif
strhi r10,[sp,#4*(16+10)] @ copy "rx" while at it
add r2,r2,r10
ldr r10,[r12,#-8]
-# ifdef __thumb2__
+#ifdef __thumb2__
it hi
-# endif
+#endif
strhi r11,[sp,#4*(16+11)] @ copy "rx" while at it
add r3,r3,r11
ldr r11,[r12,#-4]
-# ifdef __ARMEB__
+#ifdef __ARMEB__
rev r0,r0
rev r1,r1
rev r2,r2
rev r3,r3
-# endif
+#endif
eor r0,r0,r8
add r8,sp,#4*(12)
eor r1,r1,r9
@@ -1210,16 +1203,16 @@ ChaCha20_neon:
add r7,r11,r7,ror#24
ldr r10,[r12,#-8]
ldr r11,[r12,#-4]
-# ifdef __ARMEB__
+#ifdef __ARMEB__
rev r4,r4
rev r5,r5
rev r6,r6
rev r7,r7
-# endif
+#endif
eor r4,r4,r8
-# ifdef __thumb2__
+#ifdef __thumb2__
it hi
-# endif
+#endif
ldrhi r8,[sp,#4*(32+2)] @ re-load len
eor r5,r5,r9
eor r6,r6,r10
@@ -1379,7 +1372,7 @@ ChaCha20_neon:
add r6,r10,r6,ror#13
add r7,r11,r7,ror#13
ldmia r8,{r8-r11} @ load key material
-# ifdef __ARMEB__
+#ifdef __ARMEB__
rev r0,r0
rev r1,r1
rev r2,r2
@@ -1388,7 +1381,7 @@ ChaCha20_neon:
rev r5,r5
rev r6,r6
rev r7,r7
-# endif
+#endif
stmia sp,{r0-r7}
add r0,sp,#4*(16+8)

@@ -1408,7 +1401,7 @@ ChaCha20_neon:
add r6,r10,r6,ror#24
add r7,r11,r7,ror#24
ldr r11,[sp,#4*(32+2)] @ re-load len
-# ifdef __ARMEB__
+#ifdef __ARMEB__
rev r0,r0
rev r1,r1
rev r2,r2
@@ -1417,7 +1410,7 @@ ChaCha20_neon:
rev r5,r5
rev r6,r6
rev r7,r7
-# endif
+#endif
stmia r8,{r0-r7}
add r10,sp,#4*(0)
sub r11,r11,#64*3 @ len-=64*3
@@ -1434,7 +1427,7 @@ ChaCha20_neon:
add sp,sp,#4*(32+4)
vldmia sp,{d8-d15}
add sp,sp,#4*(16+3)
+.Lno_data_neon:
ldmia sp!,{r4-r11,pc}
-.size ChaCha20_neon,.-ChaCha20_neon
-.comm OPENSSL_armcap_P,4,4
+ENDPROC(chacha20_neon)
#endif
diff --git a/lib/zinc/chacha20/chacha20-arm64-cryptogams.S b/lib/zinc/chacha20/chacha20-arm64-cryptogams.S
index 4d029bfdad3a..5037510edc6f 100644
--- a/lib/zinc/chacha20/chacha20-arm64-cryptogams.S
+++ b/lib/zinc/chacha20/chacha20-arm64-cryptogams.S
@@ -1,46 +1,24 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@xxxxxxxxx>. All Rights Reserved.
* Copyright (C) 2006-2017 CRYPTOGAMS by <appro@xxxxxxxxxxx>. All Rights Reserved.
+ *
+ * This is based in part on Andy Polyakov's implementation from CRYPTOGAMS.
*/

-#include "arm_arch.h"
+#include <linux/linkage.h>

.text
-
-
-
.align 5
.Lsigma:
.quad 0x3320646e61707865,0x6b20657479622d32 // endian-neutral
.Lone:
.long 1,0,0,0
-.LOPENSSL_armcap_P:
-#ifdef __ILP32__
-.long OPENSSL_armcap_P-.
-#else
-.quad OPENSSL_armcap_P-.
-#endif
-.byte 67,104,97,67,104,97,50,48,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
-.align 2

-.globl ChaCha20_ctr32
-.type ChaCha20_ctr32,%function
.align 5
-ChaCha20_ctr32:
+ENTRY(chacha20_arm)
cbz x2,.Labort
- adr x5,.LOPENSSL_armcap_P
- cmp x2,#192
- b.lo .Lshort
-#ifdef __ILP32__
- ldrsw x6,[x5]
-#else
- ldr x6,[x5]
-#endif
- ldr w17,[x6,x5]
- tst w17,#ARMV7_NEON
- b.ne ChaCha20_neon

-.Lshort:
stp x29,x30,[sp,#-96]!
add x29,sp,#0

@@ -309,11 +287,13 @@ ChaCha20_ctr32:
ldp x27,x28,[x29,#80]
ldp x29,x30,[sp],#96
ret
-.size ChaCha20_ctr32,.-ChaCha20_ctr32
+ENDPROC(chacha20_arm)

-.type ChaCha20_neon,%function
+#ifdef CONFIG_KERNEL_MODE_NEON
.align 5
-ChaCha20_neon:
+ENTRY(chacha20_neon)
+ cbz x2,.Labort_neon
+
stp x29,x30,[sp,#-96]!
add x29,sp,#0

@@ -803,19 +783,6 @@ ChaCha20_neon:
ldp x27,x28,[x29,#80]
ldp x29,x30,[sp],#96
ret
-.size ChaCha20_neon,.-ChaCha20_neon
-.type ChaCha20_512_neon,%function
-.align 5
-ChaCha20_512_neon:
- stp x29,x30,[sp,#-96]!
- add x29,sp,#0
-
- adr x5,.Lsigma
- 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]

.L512_or_more_neon:
sub sp,sp,#128+64
@@ -1969,5 +1936,7 @@ ChaCha20_512_neon:
ldp x25,x26,[x29,#64]
ldp x27,x28,[x29,#80]
ldp x29,x30,[sp],#96
+.Labort_neon:
ret
-.size ChaCha20_512_neon,.-ChaCha20_512_neon
+ENDPROC(chacha20_neon)
+#endif
--
2.19.0

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