/* Atomic operations.  Pure ARM version.

   Copyright (C) 2002-2018 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;

#define __HAVE_64B_ATOMICS 0

#define USE_ATOMIC_COMPILER_BUILTINS 0

#define ATOMIC_EXCHANGE_USES_CAS 1

void __arm_link_error (void);

#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 atomic-machine.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

/* 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_exchange_acq(mem, value)                                \

  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)

# define atomic_exchange_rel(mem, value)                                \

  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)

/* Atomic exchange (without compare).  */

# define __arch_exchange_8_int(mem, newval, model)      \

  (__arm_link_error (), (typeof (*mem)) 0)

# define __arch_exchange_16_int(mem, newval, model)     \

  (__arm_link_error (), (typeof (*mem)) 0)

# define __arch_exchange_32_int(mem, newval, model)     \

  __atomic_exchange_n (mem, newval, model)

# define __arch_exchange_64_int(mem, newval, model)     \

  (__arm_link_error (), (typeof (*mem)) 0)

/* Compare and exchange with "acquire" semantics, ie barrier after.  */

# define atomic_compare_and_exchange_bool_acq(mem, new, old)    \

  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \

                        mem, new, old, __ATOMIC_ACQUIRE)

# define atomic_compare_and_exchange_val_acq(mem, new, old)     \

  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \

                       mem, new, old, __ATOMIC_ACQUIRE)

/* Compare and exchange with "release" semantics, ie barrier before.  */

# define atomic_compare_and_exchange_val_rel(mem, new, old)      \

  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \

                       mem, new, old, __ATOMIC_RELEASE)

/* Compare and exchange.

   For all "bool" routines, we return FALSE if exchange succesful.  */

# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \

  ({__arm_link_error (); 0; })

# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \

  ({__arm_link_error (); 0; })

# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \

  ({                                                                    \

    typeof (*mem) __oldval = (oldval);                                  \

    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \

                                  model, __ATOMIC_RELAXED);             \

  })

# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \

  ({__arm_link_error (); 0; })

# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \

  ({__arm_link_error (); oldval; })

# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \

  ({__arm_link_error (); oldval; })

# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \

  ({                                                                    \

    typeof (*mem) __oldval = (oldval);                                  \

    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \

                                 model, __ATOMIC_RELAXED);              \

    __oldval;                                                           \

  })

# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \

  ({__arm_link_error (); oldval; })

#else

# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \

  __arm_assisted_compare_and_exchange_val_32_acq ((mem), (newval), (oldval))

#endif

#ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4

/* 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; })

#endif

/* An OS-specific atomic-machine.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