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/* Atomic operations. Sparc version.
Copyright (C) 2019-2021 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 _ATOMIC_MACHINE_H
#define _ATOMIC_MACHINE_H 1
#ifdef __arch64__
# define __HAVE_64B_ATOMICS 1
#else
# define __HAVE_64B_ATOMICS 0
#endif
#define USE_ATOMIC_COMPILER_BUILTINS 1
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS __HAVE_64B_ATOMICS
/* Compare and exchange.
For all "bool" routines, we return FALSE if exchange succesful. */
#define __arch_compare_and_exchange_val_int(mem, newval, oldval, model) \
({ \
typeof (*mem) __oldval = (oldval); \
__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
model, __ATOMIC_RELAXED); \
__oldval; \
})
#define atomic_compare_and_exchange_val_acq(mem, new, old) \
({ \
__typeof ((__typeof (*(mem))) *(mem)) __result; \
if (sizeof (*mem) == 4 \
|| (__HAVE_64B_ATOMICS && sizeof (*mem) == 8)) \
__result = __arch_compare_and_exchange_val_int (mem, new, old, \
__ATOMIC_ACQUIRE); \
else \
abort (); \
__result; \
})
#ifdef __sparc_v9__
# define atomic_full_barrier() \
__asm __volatile ("membar #LoadLoad | #LoadStore" \
" | #StoreLoad | #StoreStore" : : : "memory")
# define atomic_read_barrier() \
__asm __volatile ("membar #LoadLoad | #LoadStore" : : : "memory")
# define atomic_write_barrier() \
__asm __volatile ("membar #LoadStore | #StoreStore" : : : "memory")
extern void __cpu_relax (void);
# define atomic_spin_nop() __cpu_relax ()
#endif
#endif /* _ATOMIC_MACHINE_H */
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