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Date:   Tue, 25 Sep 2018 16:56:05 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-crypto@...r.kernel.org, davem@...emloft.net,
        gregkh@...uxfoundation.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Samuel Neves <sneves@....uc.pt>,
        Andy Lutomirski <luto@...nel.org>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH net-next v6 06/23] zinc: port Andy Polyakov's ChaCha20 ARM and ARM64 implementations

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@...c4.com>
Cc: Samuel Neves <sneves@....uc.pt>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>
Cc: Russell King <linux@...linux.org.uk>
Cc: linux-arm-kernel@...ts.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@...c4.com>. All Rights Reserved.
  * Copyright (C) 2006-2017 CRYPTOGAMS by <appro@...nssl.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@...c4.com>. All Rights Reserved.
  * Copyright (C) 2006-2017 CRYPTOGAMS by <appro@...nssl.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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