about summary refs log tree commit diff
path: root/sysdeps/aarch64/atomic-machine.h
blob: 52b3fb2047cbf2518644b1595ed9a11cddcc89d2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/* Copyright (C) 2003-2022 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _AARCH64_ATOMIC_MACHINE_H
#define _AARCH64_ATOMIC_MACHINE_H	1

#define __HAVE_64B_ATOMICS 1
#define USE_ATOMIC_COMPILER_BUILTINS 1
#define ATOMIC_EXCHANGE_USES_CAS 0

/* Compare and exchange.
   For all "bool" routines, we return FALSE if exchange succesful.  */

# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

#  define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })

# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })

# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })

#  define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })


/* Compare and exchange with "acquire" semantics, ie barrier after.  */

# define atomic_compare_and_exchange_bool_acq(mem, new, old)	\
  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,	\
			mem, new, old, __ATOMIC_ACQUIRE)

# define atomic_compare_and_exchange_val_acq(mem, new, old)	\
  __atomic_val_bysize (__arch_compare_and_exchange_val, int,	\
		       mem, new, old, __ATOMIC_ACQUIRE)

/* Compare and exchange with "release" semantics, ie barrier before.  */

# define atomic_compare_and_exchange_val_rel(mem, new, old)	 \
  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
                       mem, new, old, __ATOMIC_RELEASE)


/* Atomic exchange (without compare).  */

# define __arch_exchange_8_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

# define __arch_exchange_16_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

# define __arch_exchange_32_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

#  define __arch_exchange_64_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

# define atomic_exchange_acq(mem, value)				\
  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)

# define atomic_exchange_rel(mem, value)				\
  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)


/* Atomically add value and return the previous (unincremented) value.  */

# define __arch_exchange_and_add_8_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

# define __arch_exchange_and_add_16_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

# define __arch_exchange_and_add_32_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

#  define __arch_exchange_and_add_64_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

# define atomic_exchange_and_add_acq(mem, value)			\
  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
		       __ATOMIC_ACQUIRE)

# define atomic_exchange_and_add_rel(mem, value)			\
  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
		       __ATOMIC_RELEASE)

/* Barrier macro. */
#define atomic_full_barrier() __sync_synchronize()

#endif