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58 lines
2.4 KiB
C
58 lines
2.4 KiB
C
/* Low-level functions for atomic operations. ARC version.
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Copyright (C) 2020-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _ARC_BITS_ATOMIC_H
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#define _ARC_BITS_ATOMIC_H 1
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#define __HAVE_64B_ATOMICS 0
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#define USE_ATOMIC_COMPILER_BUILTINS 1
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/* ARC does have legacy atomic EX reg, [mem] instruction but the micro-arch
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is not as optimal as LLOCK/SCOND specially for SMP. */
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#define ATOMIC_EXCHANGE_USES_CAS 1
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#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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__oldval; \
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})
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#define atomic_compare_and_exchange_val_acq(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, __ATOMIC_ACQUIRE)
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#define atomic_full_barrier() ({ asm volatile ("dmb 3":::"memory"); })
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#endif /* _ARC_BITS_ATOMIC_H */
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