f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
72 lines
2.8 KiB
ArmAsm
72 lines
2.8 KiB
ArmAsm
/* $NetBSD: atomic_cas_32.S,v 1.3 2012/08/31 23:41:52 matt Exp $ */
|
|
/*-
|
|
* Copyright (c) 2008 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Matt Thomas <matt@3am-software.com>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "atomic_op_asm.h"
|
|
|
|
#if defined(_ARM_ARCH_6)
|
|
/*
|
|
* ARMv6 has load-exclusive/store-exclusive which works for both user
|
|
* and kernel.
|
|
*/
|
|
ENTRY_NP(_atomic_cas_32)
|
|
mov r3, r0 /* we need r0 for return value */
|
|
1:
|
|
ldrex r0, [r3] /* load old value */
|
|
teq r0, r1 /* compare? */
|
|
RETc(ne) /* return if different */
|
|
strex ip, r2, [r3] /* store new value */
|
|
cmp ip, #0 /* succeed? */
|
|
bne 1b /* nope, try again. */
|
|
#ifdef _ARM_ARCH_7
|
|
dsb
|
|
#else
|
|
mcr p15, 0, ip, c7, c10, 4 /* data synchronization barrier */
|
|
#endif
|
|
RET /* return. */
|
|
END(_atomic_cas_32)
|
|
|
|
ATOMIC_OP_ALIAS(atomic_cas_32,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_uint,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_32_ni,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_uint_ni,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_32)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_uint,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_32_ni,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_uint_ni,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_32)
|
|
STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_32)
|
|
|
|
#endif /* _ARCH_ARM_6 */
|