1/* $NetBSD: atomic_dec.S,v 1.2 2007/11/29 17:09:32 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include "atomic_op_asm.h" 40 41 .text 42 43ENTRY_NOPROFILE(_atomic_dec_32) 44 movl %sp@(4), %a0 45 subql #1, %a0@ 46 rts 47ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32) 48ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32) 49STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32) 50ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_32) 51STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_32) 52ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_32) 53STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_32) 54 55ENTRY_NOPROFILE(_atomic_dec_32_nv) 56 movl %sp@(4), %a0 571: movl %a0@, %d0 58 movl %d0, %d1 59 subql #1, %d0 60 casl %d1, %d0, %a0@ 61 bne 1b 62 movl %d0, %a0 /* pointers return also in %a0 */ 63 rts 64ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv) 65ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv) 66STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv) 67ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_32_nv) 68STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_32_nv) 69ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_32_nv) 70STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_32_nv) 71