sysdeps/aarch64/atomic-machine.h

   1 /* Copyright (C) 2003-2020 Free Software Foundation, Inc.
   2
   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 _AARCH64_ATOMIC_MACHINE_H
  20 #define _AARCH64_ATOMIC_MACHINE_H       1
  21
  22 #include <stdint.h>
  23
  24 typedef int8_t  atomic8_t;
  25 typedef int16_t atomic16_t;
  26 typedef int32_t atomic32_t;
  27 typedef int64_t atomic64_t;
  28
  29 typedef uint8_t  uatomic8_t;
  30 typedef uint16_t uatomic16_t;
  31 typedef uint32_t uatomic32_t;
  32 typedef uint64_t uatomic64_t;
  33
  34 typedef intptr_t atomicptr_t;
  35 typedef uintptr_t uatomicptr_t;
  36 typedef intmax_t atomic_max_t;
  37 typedef uintmax_t uatomic_max_t;
  38
  39 #define __HAVE_64B_ATOMICS 1
  40 #define USE_ATOMIC_COMPILER_BUILTINS 1
  41 #define ATOMIC_EXCHANGE_USES_CAS 0
  42
  43 /* Compare and exchange.
  44    For all "bool" routines, we return FALSE if exchange succesful.  */
  45
  46 # define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
  47   ({                                                                    \
  48     typeof (*mem) __oldval = (oldval);                                  \
  49     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  50                                   model, __ATOMIC_RELAXED);             \
  51   })
  52
  53 # define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
  54   ({                                                                    \
  55     typeof (*mem) __oldval = (oldval);                                  \
  56     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  57                                   model, __ATOMIC_RELAXED);             \
  58   })
  59
  60 # define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
  61   ({                                                                    \
  62     typeof (*mem) __oldval = (oldval);                                  \
  63     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  64                                   model, __ATOMIC_RELAXED);             \
  65   })
  66
  67 #  define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
  68   ({                                                                    \
  69     typeof (*mem) __oldval = (oldval);                                  \
  70     !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
  71                                   model, __ATOMIC_RELAXED);             \
  72   })
  73
  74 # define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
  75   ({                                                                    \
  76     typeof (*mem) __oldval = (oldval);                                  \
  77     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  78                                  model, __ATOMIC_RELAXED);              \
  79     __oldval;                                                           \
  80   })
  81
  82 # define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
  83   ({                                                                    \
  84     typeof (*mem) __oldval = (oldval);                                  \
  85     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  86                                  model, __ATOMIC_RELAXED);              \
  87     __oldval;                                                           \
  88   })
  89
  90 # define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
  91   ({                                                                    \
  92     typeof (*mem) __oldval = (oldval);                                  \
  93     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  94                                  model, __ATOMIC_RELAXED);              \
  95     __oldval;                                                           \
  96   })
  97
  98 #  define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
  99   ({                                                                    \
 100     typeof (*mem) __oldval = (oldval);                                  \
 101     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
 102                                  model, __ATOMIC_RELAXED);              \
 103     __oldval;                                                           \
 104   })
 105
 106
 107 /* Compare and exchange with "acquire" semantics, ie barrier after.  */
 108
 109 # define atomic_compare_and_exchange_bool_acq(mem, new, old)    \
 110   __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \
 111                         mem, new, old, __ATOMIC_ACQUIRE)
 112
 113 # define atomic_compare_and_exchange_val_acq(mem, new, old)     \
 114   __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
 115                        mem, new, old, __ATOMIC_ACQUIRE)
 116
 117 /* Compare and exchange with "release" semantics, ie barrier before.  */
 118
 119 # define atomic_compare_and_exchange_val_rel(mem, new, old)      \
 120   __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
 121                        mem, new, old, __ATOMIC_RELEASE)
 122
 123
 124 /* Atomic exchange (without compare).  */
 125
 126 # define __arch_exchange_8_int(mem, newval, model)      \
 127   __atomic_exchange_n (mem, newval, model)
 128
 129 # define __arch_exchange_16_int(mem, newval, model)     \
 130   __atomic_exchange_n (mem, newval, model)
 131
 132 # define __arch_exchange_32_int(mem, newval, model)     \
 133   __atomic_exchange_n (mem, newval, model)
 134
 135 #  define __arch_exchange_64_int(mem, newval, model)    \
 136   __atomic_exchange_n (mem, newval, model)
 137
 138 # define atomic_exchange_acq(mem, value)                                \
 139   __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
 140
 141 # define atomic_exchange_rel(mem, value)                                \
 142   __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
 143
 144
 145 /* Atomically add value and return the previous (unincremented) value.  */
 146
 147 # define __arch_exchange_and_add_8_int(mem, value, model)       \
 148   __atomic_fetch_add (mem, value, model)
 149
 150 # define __arch_exchange_and_add_16_int(mem, value, model)      \
 151   __atomic_fetch_add (mem, value, model)
 152
 153 # define __arch_exchange_and_add_32_int(mem, value, model)      \
 154   __atomic_fetch_add (mem, value, model)
 155
 156 #  define __arch_exchange_and_add_64_int(mem, value, model)     \
 157   __atomic_fetch_add (mem, value, model)
 158
 159 # define atomic_exchange_and_add_acq(mem, value)                        \
 160   __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,        \
 161                        __ATOMIC_ACQUIRE)
 162
 163 # define atomic_exchange_and_add_rel(mem, value)                        \
 164   __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,        \
 165                        __ATOMIC_RELEASE)
 166
 167 /* Barrier macro. */
 168 #define atomic_full_barrier() __sync_synchronize()
 169
 170 #endif