atomic_dec_32.S revision 1.1
1/* $NetBSD: atomic_dec_32.S,v 1.1 2014/09/03 19:34:25 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2014 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 of 3am Software Foundry. 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 34ENTRY_NP(_atomic_dec_32) 351: l.lwa r11, 0(r3) /* load old value */ 36 l.addi r5, r11, -1 /* calculate new value */ 37 l.swa 0(r3), r5 /* try to store */ 38 l.bnf 1b /* succeed? no, try again */ 39 l.nop /* -- delay slot -- */ 40 l.jr lr /* return old value */ 41 l.nop 42END(_atomic_dec_32) 43 44ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32) 45ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32) 46ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_32) 47ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_32) 48STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32) 49STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_32) 50STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_32) 51 52ENTRY_NP(_atomic_dec_32_nv) 531: l.lwa r5, 0(r3) /* load old value */ 54 l.addi r11, r5, -1 /* calculate new value */ 55 l.swa 0(r3), r11 /* try to store */ 56 l.bnf 1b /* succeed? no, try again */ 57 l.nop /* -- delay slot -- */ 58 l.jr lr /* return old value */ 59 l.nop 60END(_atomic_dec_32_nv) 61 62ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv) 63ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv) 64ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_32_nv) 65ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_32_nv) 66STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv) 67STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_32_nv) 68STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_32_nv) 69