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/* Atomic operations. Pure ARM version.
Copyright (C) 2002-2013 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
<http://www.gnu.org/licenses/>. */
#include <stdint.h>
typedef int8_t atomic8_t;
typedef uint8_t uatomic8_t;
typedef int_fast8_t atomic_fast8_t;
typedef uint_fast8_t uatomic_fast8_t;
typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
void __arm_link_error (void);
/* Use the atomic builtins provided by GCC in case the backend provides
a pattern to do this efficiently. */
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
# define atomic_full_barrier() __sync_synchronize ()
#else
# define atomic_full_barrier() __arm_assisted_full_barrier ()
#endif
/* An OS-specific bits/atomic.h file will define this macro if
the OS can provide something. If not, we'll fail to build
with a compiler that doesn't supply the operation. */
#ifndef __arm_assisted_full_barrier
# define __arm_assisted_full_barrier() __arm_link_error()
#endif
/* Atomic compare and exchange. */
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
__sync_val_compare_and_swap ((mem), (oldval), (newval))
#else
# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
__arm_assisted_compare_and_exchange_val_32_acq ((mem), (newval), (oldval))
#endif
/* We don't support atomic operations on any non-word types.
So make them link errors. */
#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
({ __arm_link_error (); oldval; })
#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
({ __arm_link_error (); oldval; })
#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
({ __arm_link_error (); oldval; })
/* An OS-specific bits/atomic.h file will define this macro if
the OS can provide something. If not, we'll fail to build
with a compiler that doesn't supply the operation. */
#ifndef __arm_assisted_compare_and_exchange_val_32_acq
# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({ __arm_link_error (); oldval; })
#endif
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