1/* $NetBSD: atomic_add_32.S,v 1.2 2008/08/16 07:12:39 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 Matt Thomas <matt@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#ifdef _ARM_ARCH_6 35 36ENTRY_NP(_atomic_add_32) 37 mov r3, r0 /* need r0 for return value */ 381: ldrex r0, [r3] /* load old value (to be returned) */ 39 add r2, r0, r1 /* calculate new value */ 40 strex ip, r2, [r3] /* try to store */ 41 cmp ip, #0 /* succeed? */ 42 bne 1b /* no, try again */ 43 RET /* return old value */ 44 END(_atomic_add_32) 45ATOMIC_OP_ALIAS(atomic_add_32,_atomic_add_32) 46ATOMIC_OP_ALIAS(atomic_add_int,_atomic_add_32) 47ATOMIC_OP_ALIAS(atomic_add_long,_atomic_add_32) 48ATOMIC_OP_ALIAS(atomic_add_ptr,_atomic_add_32) 49STRONG_ALIAS(_atomic_add_int,_atomic_add_32) 50STRONG_ALIAS(_atomic_add_long,_atomic_add_32) 51STRONG_ALIAS(_atomic_add_ptr,_atomic_add_32) 52 53ENTRY_NP(_atomic_add_32_nv) 54 mov r3, r0 /* need r0 for return value */ 551: ldrex r0, [r3] /* load old value */ 56 add r0, r0, r1 /* calculate new value (return value) */ 57 strex r2, r0, [r3] /* try to store */ 58 cmp r2, #0 /* succeed? */ 59 bne 1b /* no, try again? */ 60 RET /* return new value */ 61 END(_atomic_add_32_nv) 62ATOMIC_OP_ALIAS(atomic_add_32_nv,_atomic_add_32_nv) 63ATOMIC_OP_ALIAS(atomic_add_int_nv,_atomic_add_32_nv) 64ATOMIC_OP_ALIAS(atomic_add_long_nv,_atomic_add_32_nv) 65ATOMIC_OP_ALIAS(atomic_add_ptr_nv,_atomic_add_32_nv) 66STRONG_ALIAS(_atomic_add_int_nv,_atomic_add_32_nv) 67STRONG_ALIAS(_atomic_add_long_nv,_atomic_add_32_nv) 68STRONG_ALIAS(_atomic_add_ptr_nv,_atomic_add_32_nv) 69 70#endif /* _ARM_ARCH_6 */ 71