1/*        $NetBSD: atomic_dec.S,v 1.7 2020/08/06 10:00:21 skrll Exp $ */
2
3/*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <machine/asm.h>
30#include "atomic_op_asm.h"
31
32RCSID("$NetBSD: atomic_dec.S,v 1.7 2020/08/06 10:00:21 skrll Exp $")
33
34          .text
35          .set      noreorder
36#ifdef _KERNEL_OPT
37#include "opt_cputype.h"
38#ifndef MIPS3_LOONGSON2F
39          .set      noat
40          .set      nomacro
41#endif
42#else /* _KERNEL_OPT */
43          .set      noat
44          .set      nomacro
45#endif /* _KERNEL_OPT */
46
47LEAF(_atomic_dec_32)
48#if defined(_MIPS_ARCH_OCTEONP) || defined(_MIPS_ARCH_OCTEON2)
49          li                  t0, -1
50          saa                 t0, (a0)
51#else
52          LLSCSYNC
531:        INT_LL              t0, 0(a0)
54           nop
55          INT_ADDU  t0, -1
56          INT_SC              t0, 0(a0)
57          beq                 t0, zero, 1b
58           nop
59#endif
60          j                   ra
61           nop
62END(_atomic_dec_32)
63ATOMIC_OP_ALIAS(atomic_dec_32, _atomic_dec_32)
64
65LEAF(_atomic_dec_32_nv)
66          LLSCSYNC
671:        INT_LL              v0, 0(a0)
68           nop
69          INT_ADDU  v0, -1
70          move                t0, v0
71          INT_SC              t0, 0(a0)
72          beq                 t0, zero, 1b
73           nop
74          j                   ra
75           nop
76END(_atomic_dec_32_nv)
77ATOMIC_OP_ALIAS(atomic_dec_32_nv, _atomic_dec_32_nv)
78
79#if !defined(__mips_o32)
80LEAF(_atomic_dec_64)
81#if defined(_MIPS_ARCH_OCTEONP) || defined(_MIPS_ARCH_OCTEON2)
82          li                  t0, -1
83          saad                t0, (a0)
84#else
85          LLSCSYNC
861:        REG_LL              t0, 0(a0)
87           nop
88          REG_ADDU  t0, -1
89          REG_SC              t0, 0(a0)
90          beq                 t0, zero, 1b
91           nop
92#endif
93          j                   ra
94           nop
95END(_atomic_dec_64)
96ATOMIC_OP_ALIAS(atomic_dec_64, _atomic_dec_64)
97
98LEAF(_atomic_dec_64_nv)
99          LLSCSYNC
1001:        REG_LL              v0, 0(a0)
101           nop
102          REG_ADDU  v0, -1
103          move                t0, v0
104          REG_SC              t0, 0(a0)
105          beq                 t0, zero, 1b
106           nop
107          j                   ra
108           nop
109END(_atomic_dec_64_nv)
110ATOMIC_OP_ALIAS(atomic_dec_64_nv, _atomic_dec_64_nv)
111#endif
112
113#ifdef _LP64
114STRONG_ALIAS(_atomic_dec_ptr,           _atomic_dec_64)
115STRONG_ALIAS(_atomic_dec_ptr_nv,        _atomic_dec_64_nv)
116STRONG_ALIAS(_atomic_dec_ulong,                   _atomic_dec_64)
117STRONG_ALIAS(_atomic_dec_ulong_nv,      _atomic_dec_64_nv)
118#else
119STRONG_ALIAS(_atomic_dec_ptr,           _atomic_dec_32)
120STRONG_ALIAS(_atomic_dec_ptr_nv,        _atomic_dec_32_nv)
121STRONG_ALIAS(_atomic_dec_ulong,                   _atomic_dec_32)
122STRONG_ALIAS(_atomic_dec_ulong_nv,      _atomic_dec_32_nv)
123#endif
124STRONG_ALIAS(_atomic_dec_uint,                    _atomic_dec_32)
125STRONG_ALIAS(_atomic_dec_uint_nv,       _atomic_dec_32_nv)
126
127ATOMIC_OP_ALIAS(atomic_dec_ptr,                   _atomic_dec_ptr)
128ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,      _atomic_dec_ptr_nv)
129ATOMIC_OP_ALIAS(atomic_dec_uint,        _atomic_dec_uint)
130ATOMIC_OP_ALIAS(atomic_dec_uint_nv,     _atomic_dec_uint_nv)
131ATOMIC_OP_ALIAS(atomic_dec_ulong,       _atomic_dec_ulong)
132ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,    _atomic_dec_ulong_nv)
133