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Add the appropriate memory barrier before the lock is cleared in 

__sync_lock_release_{1,2,4,8}.  That is, all reads and write for in inner
shareability domain before the lock clear store.
This commit is contained in:
skrll 2021-04-26 21:40:21 +00:00
parent 27d3824d91
commit 85e6432cbe
3 changed files with 15 additions and 5 deletions
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6
common/lib/libc/arch/arm/atomic/atomic_swap.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: atomic_swap.S,v 1.16 2021/04/24 20:34:34 skrll Exp $ */
/* $NetBSD: atomic_swap.S,v 1.17 2021/04/26 21:40:21 skrll Exp $ */
/*-
* Copyright (c) 2007,2012 The NetBSD Foundation, Inc.
@ -88,7 +88,7 @@ STRONG_ALIAS(_atomic_swap_ptr,_atomic_swap_32)
ENTRY_NP(__sync_lock_release_4)
mov r1, #0
#ifdef _ARM_ARCH_7
dmb
dmb ishst
#else
mcr p15, 0, r1, c7, c10, 5 /* data memory barrier */
#endif
@ -129,7 +129,7 @@ STRONG_ALIAS(_atomic_swap_uchar,_atomic_swap_8)
ENTRY_NP(__sync_lock_release_1)
mov r1, #0
#ifdef _ARM_ARCH_7
dmb
dmb ishst
#else
mcr p15, 0, r1, c7, c10, 5 /* data memory barrier */
#endif

7
common/lib/libc/arch/arm/atomic/atomic_swap_16.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: atomic_swap_16.S,v 1.4 2015/05/17 20:57:11 justin Exp $ */
/* $NetBSD: atomic_swap_16.S,v 1.5 2021/04/26 21:40:21 skrll Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@ -58,6 +58,11 @@ STRONG_ALIAS(_atomic_swap_ushort,_atomic_swap_16)
#if (!defined(_KERNEL) || !defined(_RUMPKERNEL)) && !defined(_STANDALONE)
ENTRY_NP(__sync_lock_release_2)
mov r1, #0
#ifdef _ARM_ARCH_7
dmb ishst
#else
mcr p15, 0, r1, c7, c10, 5 /* data memory barrier */
#endif
strh r1, [r0]
RET
END(__sync_lock_release_2)

7
common/lib/libc/arch/arm/atomic/atomic_swap_64.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: atomic_swap_64.S,v 1.11 2021/04/24 20:34:34 skrll Exp $ */
/* $NetBSD: atomic_swap_64.S,v 1.12 2021/04/26 21:40:21 skrll Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
@ -57,6 +57,11 @@ CRT_ALIAS(__atomic_exchange_8,_atomic_swap_64)
ENTRY_NP(__sync_lock_release_8)
mov r2, #0
mov r3, #0
#ifdef _ARM_ARCH_7
dmb ishst
#else
mcr p15, 0, r2, c7, c10, 5 /* data memory barrier */
#endif
strd r2, r3, [r0]
RET
END(__sync_lock_release_8)