1/* $NetBSD: atomic_add_32.S,v 1.6 2013/11/08 22:42:52 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_sub_32) 37 negs r1, r1 38 /* FALLTHROUGH */ 39ENTRY_NP(_atomic_add_32) 40 mov ip, r0 411: ldrex r0, [ip] /* load old value */ 42 adds r3, r0, r1 /* calculate new value */ 43 strex r2, r3, [ip] /* try to store */ 44 cmp r2, #0 /* succeed? */ 45 bne 1b /* no, try again */ 46#ifdef _ARM_ARCH_7 47 dmb 48#else 49 mcr p15, 0, r2, c7, c10, 5 /* data memory barrier */ 50#endif 51 RET /* return old value */ 52END(_atomic_add_32) 53END(_atomic_sub_32) 54 55ATOMIC_OP_ALIAS(atomic_add_32,_atomic_add_32) 56ATOMIC_OP_ALIAS(atomic_add_int,_atomic_add_32) 57ATOMIC_OP_ALIAS(atomic_add_long,_atomic_add_32) 58ATOMIC_OP_ALIAS(atomic_add_ptr,_atomic_add_32) 59STRONG_ALIAS(__sync_fetch_and_add_4,_atomic_add_32) 60STRONG_ALIAS(_atomic_add_int,_atomic_add_32) 61STRONG_ALIAS(_atomic_add_long,_atomic_add_32) 62STRONG_ALIAS(_atomic_add_ptr,_atomic_add_32) 63 64ATOMIC_OP_ALIAS(atomic_sub_32,_atomic_sub_32) 65ATOMIC_OP_ALIAS(atomic_sub_int,_atomic_sub_32) 66ATOMIC_OP_ALIAS(atomic_sub_long,_atomic_sub_32) 67ATOMIC_OP_ALIAS(atomic_sub_ptr,_atomic_sub_32) 68STRONG_ALIAS(__sync_fetch_and_sub_4,_atomic_sub_32) 69STRONG_ALIAS(_atomic_sub_int,_atomic_sub_32) 70STRONG_ALIAS(_atomic_sub_long,_atomic_sub_32) 71STRONG_ALIAS(_atomic_sub_ptr,_atomic_sub_32) 72 73ENTRY_NP(_atomic_sub_32_nv) 74 negs r1, r1 75 /* FALLTHROUGH */ 76ENTRY_NP(_atomic_add_32_nv) 77 mov ip, r0 /* need r0 for return value */ 781: ldrex r0, [ip] /* load old value */ 79 adds r0, r0, r1 /* calculate new value (return value) */ 80 strex r2, r0, [ip] /* try to store */ 81 cmp r2, #0 /* succeed? */ 82 bne 1b /* no, try again? */ 83#ifdef _ARM_ARCH_7 84 dmb 85#else 86 mcr p15, 0, r2, c7, c10, 5 /* data memory barrier */ 87#endif 88 RET /* return new value */ 89END(_atomic_add_32_nv) 90END(_atomic_sub_32_nv) 91ATOMIC_OP_ALIAS(atomic_add_32_nv,_atomic_add_32_nv) 92ATOMIC_OP_ALIAS(atomic_add_int_nv,_atomic_add_32_nv) 93ATOMIC_OP_ALIAS(atomic_add_long_nv,_atomic_add_32_nv) 94ATOMIC_OP_ALIAS(atomic_add_ptr_nv,_atomic_add_32_nv) 95STRONG_ALIAS(__sync_add_and_fetch_4,_atomic_add_32_nv) 96STRONG_ALIAS(_atomic_add_int_nv,_atomic_add_32_nv) 97STRONG_ALIAS(_atomic_add_long_nv,_atomic_add_32_nv) 98STRONG_ALIAS(_atomic_add_ptr_nv,_atomic_add_32_nv) 99 100ATOMIC_OP_ALIAS(atomic_sub_32_nv,_atomic_sub_32_nv) 101ATOMIC_OP_ALIAS(atomic_sub_int_nv,_atomic_sub_32_nv) 102ATOMIC_OP_ALIAS(atomic_sub_long_nv,_atomic_sub_32_nv) 103ATOMIC_OP_ALIAS(atomic_sub_ptr_nv,_atomic_sub_32_nv) 104STRONG_ALIAS(__sync_sub_and_fetch_4,_atomic_sub_32_nv) 105STRONG_ALIAS(_atomic_sub_int_nv,_atomic_sub_32_nv) 106STRONG_ALIAS(_atomic_sub_long_nv,_atomic_sub_32_nv) 107STRONG_ALIAS(_atomic_sub_ptr_nv,_atomic_sub_32_nv) 108#endif /* _ARM_ARCH_6 */ 109