1/* $NetBSD: atomic_dec.S,v 1.6 2013/07/16 23:24:18 matt 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 movl 4(%sp), %a0 38 subql #1, (%a0) 39 rts 40END(_atomic_dec_32) 41ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32) 42ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32) 43STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32) 44ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_32) 45STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_32) 46ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_32) 47STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_32) 48 49ENTRY(_atomic_dec_32_nv) 50 movl 4(%sp), %a0 511: movl (%a0), %d0 52 movl %d0, %d1 53 subql #1, %d0 54 casl %d1, %d0, (%a0) 55 bne 1b 56 movl %d0, %a0 /* pointers return also in %a0 */ 57 rts 58END(_atomic_dec_32_nv) 59ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv) 60ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv) 61STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv) 62ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_32_nv) 63STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_32_nv) 64ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_32_nv) 65STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_32_nv) 66