diff options
| author |   patrick <patrick@openbsd.org> | 2013-01-23 20:49:55 +0000 |
|---|---|---|
| committer | patrick <patrick@openbsd.org> | 2013-01-23 20:49:55 +0000 |
| commit | 091d487ac55ed35a731d92681d4678e47e329c1c (patch) | |
| tree | 3b9fdac90cecdea141f4651cfde012122f2b1949 /lib/librthread/arch | |
| parent | Add instruction fault register functions, which will be needed for further (diff) | |
| download | wireguard-openbsd-091d487ac55ed35a731d92681d4678e47e329c1c.tar.xz wireguard-openbsd-091d487ac55ed35a731d92681d4678e47e329c1c.zip | |
ARMv7 doesn't support the atomic SWP instruction anymore. Use the atomic
load and store instructions instead.
ok miod@
Diffstat (limited to 'lib/librthread/arch')
| -rw-r--r-- | lib/librthread/arch/arm/_atomic_lock.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/librthread/arch/arm/_atomic_lock.c b/lib/librthread/arch/arm/_atomic_lock.c index 01a3cef3a9f..48bca7da276 100644 --- a/lib/librthread/arch/arm/_atomic_lock.c +++ b/lib/librthread/arch/arm/_atomic_lock.c @@ -1,4 +1,4 @@ -/* $OpenBSD: _atomic_lock.c,v 1.2 2006/01/05 22:33:23 marc Exp $ */ +/* $OpenBSD: _atomic_lock.c,v 1.3 2013/01/23 20:49:55 patrick Exp $ */ /* * Copyright (c) 2004 Dale Rahn. All rights reserved. @@ -35,9 +35,20 @@ _atomic_lock(volatile _spinlock_lock_t *lock) { _spinlock_lock_t old; +#ifdef ARM_V7PLUS_LOCKS + uint32_t scratch = 0; + old = 0; + __asm__("1: ldrex %0, [%1] \n" + " strex %2, %3, [%1] \n" + " cmp %2, #0 \n" + " bne 1b \n" + : "+r" (old), "+r" (lock), "+r" (scratch) + : "r" (_SPINLOCK_LOCKED)); +#else __asm__("swp %0, %2, [%1]" : "=r" (old), "=r" (lock) : "r" (_SPINLOCK_LOCKED), "1" (lock) ); +#endif return (old != _SPINLOCK_UNLOCKED); } |