1 /* Atomic operations.
2 Copyright (C) 2022-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _LINUX_LOONGARCH_BITS_ATOMIC_H
20 #define _LINUX_LOONGARCH_BITS_ATOMIC_H 1
21
22 #define atomic_full_barrier() __sync_synchronize ()
23
24 #define __HAVE_64B_ATOMICS (__loongarch_grlen >= 64)
25 #define USE_ATOMIC_COMPILER_BUILTINS 1
26 #define ATOMIC_EXCHANGE_USES_CAS 0
27
28 /* Compare and exchange.
29 For all "bool" routines, we return FALSE if exchange successful. */
30
31 #define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
32 ({ \
33 typeof (*mem) __oldval = (oldval); \
34 !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
35 __ATOMIC_RELAXED); \
36 })
37
38 #define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
39 ({ \
40 typeof (*mem) __oldval = (oldval); \
41 !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
42 __ATOMIC_RELAXED); \
43 })
44
45 #define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
46 ({ \
47 typeof (*mem) __oldval = (oldval); \
48 !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
49 __ATOMIC_RELAXED); \
50 })
51
52 #define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
53 ({ \
54 typeof (*mem) __oldval = (oldval); \
55 !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
56 __ATOMIC_RELAXED); \
57 })
58
59 #define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
60 ({ \
61 typeof (*mem) __oldval = (oldval); \
62 __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
63 __ATOMIC_RELAXED); \
64 __oldval; \
65 })
66
67 #define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
68 ({ \
69 typeof (*mem) __oldval = (oldval); \
70 __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
71 __ATOMIC_RELAXED); \
72 __oldval; \
73 })
74
75 #define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
76 ({ \
77 typeof (*mem) __oldval = (oldval); \
78 __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
79 __ATOMIC_RELAXED); \
80 __oldval; \
81 })
82
83 #define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
84 ({ \
85 typeof (*mem) __oldval = (oldval); \
86 __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
87 __ATOMIC_RELAXED); \
88 __oldval; \
89 })
90
91 /* Atomic compare and exchange. */
92
93 #define atomic_compare_and_exchange_bool_acq(mem, new, old) \
94 __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, mem, new, old, \
95 __ATOMIC_ACQUIRE)
96
97 #define atomic_compare_and_exchange_val_acq(mem, new, old) \
98 __atomic_val_bysize (__arch_compare_and_exchange_val, int, mem, new, old, \
99 __ATOMIC_ACQUIRE)
100
101 #define atomic_compare_and_exchange_val_rel(mem, new, old) \
102 __atomic_val_bysize (__arch_compare_and_exchange_val, int, mem, new, old, \
103 __ATOMIC_RELEASE)
104
105 /* Atomic exchange (without compare). */
106
107 #define __arch_exchange_8_int(mem, newval, model) \
108 __atomic_exchange_n (mem, newval, model)
109
110 #define __arch_exchange_16_int(mem, newval, model) \
111 __atomic_exchange_n (mem, newval, model)
112
113 #define __arch_exchange_32_int(mem, newval, model) \
114 __atomic_exchange_n (mem, newval, model)
115
116 #define __arch_exchange_64_int(mem, newval, model) \
117 __atomic_exchange_n (mem, newval, model)
118
119 #define atomic_exchange_acq(mem, value) \
120 __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
121
122 #define atomic_exchange_rel(mem, value) \
123 __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
124
125 /* Atomically add value and return the previous (unincremented) value. */
126
127 #define __arch_exchange_and_add_8_int(mem, value, model) \
128 __atomic_fetch_add (mem, value, model)
129
130 #define __arch_exchange_and_add_16_int(mem, value, model) \
131 __atomic_fetch_add (mem, value, model)
132
133 #define __arch_exchange_and_add_32_int(mem, value, model) \
134 __atomic_fetch_add (mem, value, model)
135
136 #define __arch_exchange_and_add_64_int(mem, value, model) \
137 __atomic_fetch_add (mem, value, model)
138
139 #define atomic_exchange_and_add_acq(mem, value) \
140 __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
141 __ATOMIC_ACQUIRE)
142
143 #define atomic_exchange_and_add_rel(mem, value) \
144 __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
145 __ATOMIC_RELEASE)
146
147 #endif /* bits/atomic.h */