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Subject[PATCH net-next v6 06/23] zinc: port Andy Polyakov's ChaCha20 ARM and ARM64 implementations
Date
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@zx2c4.com>
Cc: Samuel Neves <sneves@dei.uc.pt>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
---
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@zx2c4.com>. All Rights Reserved.
* Copyright (C) 2006-2017 CRYPTOGAMS by <appro@openssl.org>. 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@zx2c4.com>. All Rights Reserved.
* Copyright (C) 2006-2017 CRYPTOGAMS by <appro@openssl.org>. 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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