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atomic_cas.S revision 1.9 
      1 /*	$NetBSD: atomic_cas.S,v 1.9 2020/03/01 23:23:36 rin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "atomic_op_asm.h"
     33 
     34 __RCSID("$NetBSD: atomic_cas.S,v 1.9 2020/03/01 23:23:36 rin Exp $")
     35 
     36 	.text
     37 ENTRY(_atomic_cas_32)
     38 	mr	%r10,%r3
     39 1:	lwarx	%r3,0,%r10
     40 	cmpw	%r3,%r4
     41 	bnelr-
     42 	IBM405_ERRATA77_DCBT(0,%r10)
     43 	stwcx.	%r5,0,%r10
     44 	beqlr+
     45 	b	1b
     46 END(_atomic_cas_32)
     47 
     48 ATOMIC_OP_ALIAS(atomic_cas_32,_atomic_cas_32)
     49 ATOMIC_OP_ALIAS(atomic_cas_32_ni,_atomic_cas_32)
     50 STRONG_ALIAS(_atomic_cas_32_ni,_atomic_cas_32)
     51 
     52 ATOMIC_OP_ALIAS(atomic_cas_uint,_atomic_cas_32)
     53 ATOMIC_OP_ALIAS(atomic_cas_uint_ni,_atomic_cas_32)
     54 
     55 STRONG_ALIAS(_atomic_cas_uint,_atomic_cas_32)
     56 STRONG_ALIAS(_atomic_cas_uint_ni,_atomic_cas_32)
     57 
     58 #if defined(_LP64)
     59 ENTRY(_atomic_cas_64)
     60 	mr	%r10,%r3
     61 1:	ldarx	%r3,0,%r10
     62 	cmpd	%r3,%r4
     63 	bnelr-
     64 	stdcx.	%r5,0,%r10
     65 	beqlr+
     66 	b	1b
     67 END(_atomic_cas_64)
     68 
     69 ATOMIC_OP_ALIAS(atomic_cas_64,_atomic_cas_64)
     70 ATOMIC_OP_ALIAS(atomic_cas_64_ni,_atomic_cas_64)
     71 STRONG_ALIAS(_atomic_cas_64_ni,_atomic_cas_64)
     72 
     73 ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_64)
     74 ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_64)
     75 
     76 ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_64)
     77 ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_64)
     78 
     79 STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_64)
     80 STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_64)
     81 
     82 STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_64)
     83 STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_64)
     84 #else
     85 ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_32)
     86 ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_32)
     87 
     88 ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_32)
     89 ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_32)
     90 
     91 STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_32)
     92 STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_32)
     93 
     94 STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_32)
     95 STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_32)
     96 #endif
     97