1/* $NetBSD: atomic_dec.S,v 1.7 2008/05/25 15:56:12 chs 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 36ENTRY(_atomic_dec_32) 37 ld [%o0], %o2 381: add %o2, -1, %o3 39 cas [%o0], %o2, %o3 40 cmp %o2, %o3 41 bne,a,pn %icc, 1b 42 mov %o3, %o2 43 retl 44 add %o2, -1, %o0 45ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32) 46ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32) 47STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32) 48 49ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32) 50STRONG_ALIAS(_atomic_dec_32_nv,_atomic_dec_32) 51ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32) 52STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32) 53 54ENTRY(_atomic_dec_64) 55 ldx [%o0], %o2 561: add %o2, -1, %o3 57 casx [%o0], %o2, %o3 58 cmp %o2, %o3 59 bne,a,pn %xcc, 1b 60 mov %o3, %o2 61 retl 62 add %o2, -1, %o0 63ATOMIC_OP_ALIAS(atomic_dec_64,_atomic_dec_64) 64 65ATOMIC_OP_ALIAS(atomic_dec_64_nv,_atomic_dec_64) 66STRONG_ALIAS(_atomic_dec_64_nv,_atomic_dec_64) 67 68ATOMIC_OP_ALIAS_SIZE(atomic_dec_ulong,_atomic_dec) 69STRONG_ALIAS_SIZE(_atomic_dec_ulong,_atomic_dec) 70ATOMIC_OP_ALIAS_SIZE(atomic_dec_ptr,_atomic_dec) 71STRONG_ALIAS_SIZE(_atomic_dec_ptr,_atomic_dec) 72 73ATOMIC_OP_ALIAS_SIZE(atomic_dec_ulong_nv,_atomic_dec) 74STRONG_ALIAS_SIZE(_atomic_dec_ulong_nv,_atomic_dec) 75ATOMIC_OP_ALIAS_SIZE(atomic_dec_ptr_nv,_atomic_dec) 76STRONG_ALIAS_SIZE(_atomic_dec_ptr_nv,_atomic_dec) 77