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      1 /*	$NetBSD: atomic_add.S,v 1.11 2022/04/06 22:47:56 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 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 	.text
     35 	.align	2
     36 
     37 ENTRY(_atomic_add_32)
     38 	movl	4(%sp), %a0
     39 	movl	8(%sp), %d0
     40 	addl	%d0, (%a0)
     41 	rts
     42 END(_atomic_add_32)
     43 ATOMIC_OP_ALIAS(atomic_add_32,_atomic_add_32)
     44 ATOMIC_OP_ALIAS(atomic_add_int,_atomic_add_32)
     45 STRONG_ALIAS(_atomic_add_int,_atomic_add_32)
     46 ATOMIC_OP_ALIAS(atomic_add_long,_atomic_add_32)
     47 STRONG_ALIAS(_atomic_add_long,_atomic_add_32)
     48 ATOMIC_OP_ALIAS(atomic_add_ptr,_atomic_add_32)
     49 STRONG_ALIAS(_atomic_add_ptr,_atomic_add_32)
     50 
     51 ENTRY(_atomic_add_32_nv)
     52 	movl	4(%sp), %a0
     53 1:	movl	(%a0), %d0
     54 	movl	%d0, %d1
     55 	addl	8(%sp), %d0
     56 	casl	%d1, %d0, (%a0)
     57 	bne	1b
     58 	movl	%d0, %a0	/* pointers return also in %a0 */
     59 	rts
     60 END(_atomic_add_32_nv)
     61 
     62 ATOMIC_OP_ALIAS(atomic_add_32_nv,_atomic_add_32_nv)
     63 ATOMIC_OP_ALIAS(atomic_add_int_nv,_atomic_add_32_nv)
     64 STRONG_ALIAS(_atomic_add_int_nv,_atomic_add_32_nv)
     65 ATOMIC_OP_ALIAS(atomic_add_long_nv,_atomic_add_32_nv)
     66 STRONG_ALIAS(_atomic_add_long_nv,_atomic_add_32_nv)
     67 ATOMIC_OP_ALIAS(atomic_add_ptr_nv,_atomic_add_32_nv)
     68 STRONG_ALIAS(_atomic_add_ptr_nv,_atomic_add_32_nv)
     69 CRT_ALIAS(__sync_add_and_fetch_4,_atomic_add_32_nv)
     70 
     71 ENTRY(__sync_fetch_and_add_4)
     72 	movl	4(%sp), %a0
     73 1:	movl	(%a0), %d0
     74 	movl	%d0, %d1
     75 	addl	8(%sp), %d1
     76 	casl	%d0, %d1, (%a0)
     77 	bne	1b
     78 	movl	%d0, %a0	/* pointers return also in %a0 */
     79 	rts
     80 END(__sync_fetch_and_add_4)
     81 
     82 ENTRY(_atomic_add_16_nv)
     83 	movl	4(%sp), %a0
     84 1:	movw	(%a0), %d0
     85 	movw	%d0, %d1
     86 	addw	8(%sp), %d0
     87 	casw	%d1, %d0, (%a0)
     88 	bne	1b
     89 	rts
     90 END(_atomic_add_16_nv)
     91 
     92 CRT_ALIAS(__sync_add_and_fetch_2,_atomic_add_16_nv)
     93 
     94 ENTRY(__sync_fetch_and_add_2)
     95 	movl	4(%sp), %a0
     96 1:	movw	(%a0), %d0
     97 	movw	%d0, %d1
     98 	addw	8(%sp), %d1
     99 	casw	%d0, %d1, (%a0)
    100 	bne	1b
    101 	rts
    102 END(__sync_fetch_and_add_2)
    103 
    104 ENTRY(_atomic_add_8_nv)
    105 	movl	4(%sp), %a0
    106 1:	movb	(%a0), %d0
    107 	movb	%d0, %d1
    108 	addb	8(%sp), %d0
    109 	casb	%d1, %d0, (%a0)
    110 	bne	1b
    111 	rts
    112 END(_atomic_add_8_nv)
    113 
    114 CRT_ALIAS(__sync_add_and_fetch_1,_atomic_add_8_nv)
    115 
    116 ENTRY(__sync_fetch_and_add_1)
    117 	movl	4(%sp), %a0
    118 1:	movb	(%a0), %d0
    119 	movb	%d0, %d1
    120 	addb	8(%sp), %d1
    121 	casb	%d0, %d1, (%a0)
    122 	bne	1b
    123 	rts
    124 END(__sync_fetch_and_add_1)
    125 
    126 CRT_ALIAS(__atomic_fetch_add_1,__sync_fetch_and_add_1)
    127 CRT_ALIAS(__atomic_fetch_add_2,__sync_fetch_and_add_2)
    128 CRT_ALIAS(__atomic_fetch_add_4,__sync_fetch_and_add_4)
    129