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      1 /*	$NetBSD: sync_fetch_and_and_8.S,v 1.6 2021/07/28 07:32:20 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas <matt (at) 3am-software.com>
      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 #if defined(_ARM_ARCH_6)
     35 
     36 ENTRY_NP(__sync_fetch_and_and_8)
     37 	push	{r4-r7}
     38 	mov	ip, r0
     39 #ifndef __ARM__EABI__
     40 	mov	r3, r2
     41 	mov	r2, r1
     42 #endif
     43 	DMB
     44 1:	ldrexd	r0, r1, [ip]		/* load old value */
     45 	ands	r4, r0, r2		/* calculate new value */
     46 	ands	r5, r1, r3		/* calculate new value */
     47 	strexd	r6, r4, r5, [ip]	/* try to store */
     48 	cmp	r6, #0			/*   succeed? */
     49 	bne	1b			/*     no, try again */
     50 	DMB
     51 	pop	{r4-r7}
     52 	RET				/* return old value */
     53 END(__sync_fetch_and_and_8)
     54 
     55 CRT_ALIAS(__atomic_fetch_and_8,__sync_fetch_and_and_8)
     56 
     57 #endif /* _ARM_ARCH_6 */
     58