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atomic_cas_64.S revision 1.2.16.2 
      1 /*	$NetBSD: atomic_cas_64.S,v 1.2.16.2 2020/04/21 19:37:45 martin Exp $	*/
      2 /*-
      3  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Matt Thomas <matt (at) 3am-software.com>
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifdef _LP64
     32 #include "atomic_op_asm.h"
     33 
     34 ENTRY_NP(_atomic_cas_64)
     35 	mv	t0, a0
     36 1:	lr.d	a0, 0(t0)
     37 	bne	a1, a0, 2f
     38 	sc.d	t1, a2, 0(t0)
     39 	bnez	t1, 1b
     40 2:
     41 	ret
     42 END(_atomic_cas_64)
     43 
     44 ATOMIC_OP_ALIAS(atomic_cas_64,_atomic_cas_64)
     45 ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_64)
     46 STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_64)
     47 ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_64)
     48 STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_64)
     49 ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_64)
     50 STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_64)
     51 ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_64)
     52 STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_64)
     53 
     54 CRT_ALIAS(__sync_val_compare_and_swap_8,_atomic_cas_64)
     55 
     56 ENTRY_NP(_atomic_bool_cas_64)
     57 	mv	t0, a0
     58 	li	a0, 0
     59 1:	lr.d	t1, 0(t0)
     60 	bne	a1, t1, 2f
     61 	sc.d	t1, a2, 0(t0)
     62 	bnez	t1, 1b
     63 	li	a0, 1
     64 2:
     65 	ret
     66 END(_atomic_bool_cas_64)
     67 
     68 ATOMIC_OP_ALIAS(atomic_bool_cas_64,_atomic_bool_cas_64)
     69 CRT_ALIAS(__bool_val_compare_and_swap_8,_atomic_bool_cas_64)
     70 #endif /* _LP64 */
     71