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atomic_cas_up.S revision 1.7.26.1 
      1 /*	$NetBSD: atomic_cas_up.S,v 1.7.26.1 2020/04/08 14:03:05 martin 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 	str	r2, [r3]
     45 #else
     46 	streq	r2, [r3]
     47 #endif
     48 	.align	0
     49 RAS_END_ASM_HIDDEN(_atomic_cas)
     50 1:	RET
     51 END(_atomic_cas_up)
     52 
     53 #if defined(__HAVE_ASM_ATOMIC_CAS_64_UP)
     54 ARM_ENTRY(_atomic_cas_64_up)
     55 	push	{r4-r5}
     56 	mov	ip, r0
     57 	ldrd	r4, r5, [sp, #8]
     58 	.align	0
     59 RAS_START_ASM_HIDDEN(_atomic_cas_64)
     60 	ldrd	r0, r1, [ip]
     61 	cmp	r0, r2
     62 	cmpeq	r1, r3
     63 	strdeq	r4, r5, [ip]
     64 	.align	0
     65 RAS_END_ASM_HIDDEN(_atomic_cas_64)
     66 1:	pop	{r4-r5}
     67 	bx	lr
     68 END(_atomic_cas_64_up)
     69 #endif /* __HAVE_ASM_ATOMIC_64_UP */
     70 
     71 ENTRY(_atomic_cas_16_up)
     72 	mov	r3, r0
     73 	.align	0
     74 RAS_START_ASM_HIDDEN(_atomic_cas_16)
     75 	ldrh	r0, [r3]
     76 	cmp	r0, r1
     77 #if defined(__thumb__)
     78 	beq	1f
     79 	strh	r2, [r3]
     80 #else
     81 	strheq	r2, [r3]
     82 #endif
     83 	.align	0
     84 RAS_END_ASM_HIDDEN(_atomic_cas_16)
     85 1:	RET
     86 END(_atomic_cas_16_up)
     87 
     88 ENTRY(_atomic_cas_8_up)
     89 	mov	r3, r0
     90 	.align	0
     91 RAS_START_ASM_HIDDEN(_atomic_cas_8)
     92 	ldrb	r0, [r3]
     93 	cmp	r0, r1
     94 #if defined(__thumb__)
     95 	beq	1f
     96 	strb	r2, [r3]
     97 #else
     98 	strbeq	r2, [r3]
     99 #endif
    100 	.align	0
    101 RAS_END_ASM_HIDDEN(_atomic_cas_8)
    102 1:	RET
    103 END(_atomic_cas_8_up)
    104