mirror of
https://github.com/Stichting-MINIX-Research-Foundation/netbsd.git
synced 2025-09-07 22:29:21 -04:00
56 lines
2.4 KiB
ArmAsm
56 lines
2.4 KiB
ArmAsm
/* $NetBSD: atomic_cas_64.S,v 1.1 2014/08/10 05:47:35 matt Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2014 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Matt Thomas of 3am Software Foundry.
|
|
*
|
|
* 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"
|
|
|
|
ENTRY_NP(_atomic_cas_64)
|
|
mov x4, x0 /* we need r0 for return value */
|
|
1: ldxr x0, [x4] /* load old value */
|
|
cmp x0, x1 /* compare? */
|
|
b.ne 2f /* return if different */
|
|
stxr w3, x2, [x4] /* store new value */
|
|
cbnz w3, 1b /* succeed? nope, try again. */
|
|
dmb st
|
|
2: ret /* return. */
|
|
END(_atomic_cas_64)
|
|
|
|
ATOMIC_OP_ALIAS(atomic_cas_64,_atomic_cas_64)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_64)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_64)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_64)
|
|
ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_64)
|
|
STRONG_ALIAS(__sync_val_compare_and_swap_8,_atomic_cas_64)
|
|
STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_64)
|
|
STRONG_ALIAS(_atomic_cas_64_ni,_atomic_cas_64)
|
|
STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_64)
|
|
STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_64)
|
|
STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_64)
|