sysdeps/sparc/atomic-machine.h

   1 /* Atomic operations.  Sparc version.
   2    Copyright (C) 2019-2021 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 _ATOMIC_MACHINE_H
  20 #define _ATOMIC_MACHINE_H       1
  21
  22 #include <stdint.h>
  23
  24 typedef int8_t atomic8_t;
  25 typedef uint8_t uatomic8_t;
  26 typedef int_fast8_t atomic_fast8_t;
  27 typedef uint_fast8_t uatomic_fast8_t;
  28
  29 typedef int16_t atomic16_t;
  30 typedef uint16_t uatomic16_t;
  31 typedef int_fast16_t atomic_fast16_t;
  32 typedef uint_fast16_t uatomic_fast16_t;
  33
  34 typedef int32_t atomic32_t;
  35 typedef uint32_t uatomic32_t;
  36 typedef int_fast32_t atomic_fast32_t;
  37 typedef uint_fast32_t uatomic_fast32_t;
  38
  39 typedef int64_t atomic64_t;
  40 typedef uint64_t uatomic64_t;
  41 typedef int_fast64_t atomic_fast64_t;
  42 typedef uint_fast64_t uatomic_fast64_t;
  43
  44 typedef intptr_t atomicptr_t;
  45 typedef uintptr_t uatomicptr_t;
  46 typedef intmax_t atomic_max_t;
  47 typedef uintmax_t uatomic_max_t;
  48
  49 #ifdef __arch64__
  50 # define __HAVE_64B_ATOMICS          1
  51 #else
  52 # define __HAVE_64B_ATOMICS          0
  53 #endif
  54 #define USE_ATOMIC_COMPILER_BUILTINS 1
  55
  56 /* XXX Is this actually correct?  */
  57 #define ATOMIC_EXCHANGE_USES_CAS     __HAVE_64B_ATOMICS
  58
  59 /* Compare and exchange.
  60    For all "bool" routines, we return FALSE if exchange succesful.  */
  61
  62 #define __arch_compare_and_exchange_val_int(mem, newval, oldval, model) \
  63   ({                                                                    \
  64     typeof (*mem) __oldval = (oldval);                                  \
  65     __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
  66                                  model, __ATOMIC_RELAXED);              \
  67     __oldval;                                                           \
  68   })
  69
  70 #define atomic_compare_and_exchange_val_acq(mem, new, old)                    \
  71   ({                                                                          \
  72     __typeof ((__typeof (*(mem))) *(mem)) __result;                           \
  73     if (sizeof (*mem) == 4                                                    \
  74         || (__HAVE_64B_ATOMICS && sizeof (*mem) == 8))                        \
  75       __result = __arch_compare_and_exchange_val_int (mem, new, old,          \
  76                                                          __ATOMIC_ACQUIRE);   \
  77     else                                                                      \
  78       abort ();                                                               \
  79     __result;                                                                 \
  80   })
  81
  82 #ifdef __sparc_v9__
  83 # define atomic_full_barrier() \
  84   __asm __volatile ("membar #LoadLoad | #LoadStore"                           \
  85                     " | #StoreLoad | #StoreStore" : : : "memory")
  86 # define atomic_read_barrier() \
  87   __asm __volatile ("membar #LoadLoad | #LoadStore" : : : "memory")
  88 # define atomic_write_barrier() \
  89   __asm __volatile ("membar #LoadStore | #StoreStore" : : : "memory")
  90
  91 extern void __cpu_relax (void);
  92 # define atomic_spin_nop() __cpu_relax ()
  93 #endif
  94
  95 #endif /* _ATOMIC_MACHINE_H  */