1/*	$NetBSD: atomic_sub_64.S,v 1.3 2023/05/07 12:41:45 skrll 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_64)
35	li		a1, 1
36ENTRY_NP(_atomic_sub_64)
37	neg		t1, a1
38	amoadd.d.aq	a0, t1, 0(a0)
39	ret
40END(_atomic_sub_64)
41END(_atomic_dec_64)
42
43ATOMIC_OP_ALIAS(atomic_sub_64,_atomic_sub_64)
44ATOMIC_OP_ALIAS(atomic_sub_long,_atomic_sub_64)
45STRONG_ALIAS(_atomic_sub_long,_atomic_sub_64)
46ATOMIC_OP_ALIAS(atomic_sub_ptr,_atomic_sub_64)
47STRONG_ALIAS(_atomic_sub_ptr,_atomic_sub_64)
48CRT_ALIAS(__sync_fetch_and_sub_8,_atomic_sub_64)
49CRT_ALIAS(__atomic_fetch_sub_8,_atomic_sub_64)
50
51ATOMIC_OP_ALIAS(atomic_dec_64,_atomic_dec_64)
52ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_64)
53STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_64)
54ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_64)
55STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_64)
56
57ENTRY_NP(_atomic_dec_64_nv)
58	li		a1, 1
59ENTRY_NP(_atomic_sub_64_nv)
60	neg		t1, a1
61	amoadd.d.aq	t0, t1, 0(a0)	/* update memory and get old value */
62	add		a0, t0, t1	/* turn into new value */
63	ret
64END(_atomic_sub_64_nv)
65END(_atomic_dec_64_nv)
66
67ATOMIC_OP_ALIAS(atomic_sub_64_nv,_atomic_sub_64_nv)
68ATOMIC_OP_ALIAS(atomic_sub_long_nv,_atomic_sub_64_nv)
69STRONG_ALIAS(_atomic_sub_long_nv,_atomic_sub_64_nv)
70ATOMIC_OP_ALIAS(atomic_sub_ptr_nv,_atomic_sub_64_nv)
71STRONG_ALIAS(_atomic_sub_ptr_nv,_atomic_sub_64_nv)
72CRT_ALIAS(__sync_sub_and_fetch_8,_atomic_sub_64_nv)
73CRT_ALIAS(__atomic_sub_fetch_8,_atomic_sub_64_nv)
74
75ATOMIC_OP_ALIAS(atomic_dec_64_nv,_atomic_dec_64_nv)
76ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_64_nv)
77STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_64_nv)
78ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_64_nv)
79STRONG_ALIAS(_atomic_sub_ptr_nv,_atomic_sub_64_nv)
80