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atomic_cas_up.S revision 1.6 
      1 /*	$NetBSD: atomic_cas_up.S,v 1.6 2014/02/27 09:39:00 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Steve C. Woodford.
      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 <sys/ras.h>
     33 #include <machine/asm.h>
     34 
     35 ENTRY(_atomic_cas_up)
     36 	.hidden	_C_LABEL(_atomic_cas_up)
     37 	mov	r3, r0
     38 	.align	0
     39 RAS_START_ASM_HIDDEN(_atomic_cas)
     40 	ldr	r0, [r3]
     41 	cmp	r0, r1
     42 #if defined(__thumb__)
     43 	beq	1f
     44 #else
     45 	streq	r2, [r3]
     46 #endif
     47 	.align	0
     48 RAS_END_ASM_HIDDEN(_atomic_cas)
     49 1:	RET
     50 END(_atomic_cas_up)
     51 
     52 #if defined(__HAVE_ASM_ATOMIC_CAS_64_UP)
     53 ARM_ENTRY(_atomic_cas_64_up)
     54 	push	{r4-r5}
     55 	mov	ip, r0
     56 	ldrd	r4, r5, [sp]
     57 	.align	0
     58 RAS_START_ASM_HIDDEN(_atomic_cas_64)
     59 	ldrd	r0, r1, [ip]
     60 	cmp	r0, r2
     61 	cmpeq	r1, r3
     62 	strdeq	r4, r5, [ip]
     63 	.align	0
     64 RAS_END_ASM_HIDDEN(_atomic_cas_64)
     65 1:	pop	{r4-r5}
     66 	bx	lr
     67 END(_atomic_cas_64_up)
     68 #endif /* __HAVE_ASM_ATOMIC_64_UP */
     69 
     70 ENTRY(_atomic_cas_16_up)
     71 	mov	r3, r0
     72 	.align	0
     73 RAS_START_ASM_HIDDEN(_atomic_cas_16)
     74 	ldrh	r0, [r3]
     75 	cmp	r0, r1
     76 #if defined(__thumb__)
     77 	beq	1f
     78 #else
     79 	strheq	r2, [r3]
     80 #endif
     81 	.align	0
     82 RAS_END_ASM_HIDDEN(_atomic_cas_16)
     83 1:	RET
     84 END(_atomic_cas_16_up)
     85 
     86 ENTRY(_atomic_cas_8_up)
     87 	mov	r3, r0
     88 	.align	0
     89 RAS_START_ASM_HIDDEN(_atomic_cas_8)
     90 	ldrb	r0, [r3]
     91 	cmp	r0, r1
     92 #if defined(__thumb__)
     93 	beq	1f
     94 #else
     95 	strbeq	r2, [r3]
     96 #endif
     97 	.align	0
     98 RAS_END_ASM_HIDDEN(_atomic_cas_8)
     99 1:	RET
    100 END(_atomic_cas_8_up)
    101