[thirdparty/glibc.git] / sysdeps / arm / bits / atomic.h

/* Atomic operations.  Pure ARM version.
   Copyright (C) 2002-2015 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

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 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

/* Use the atomic builtins provided by GCC in case the backend provides
   a pattern to do this efficiently.  */
#if __GNUC_PREREQ (4, 7) && defined __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_bool_rel(mem, new, old)    \
  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \
                        mem, new, old, __ATOMIC_RELEASE)

# 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; })

#elif defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
/* Atomic compare and exchange.  */
# 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

#if !__GNUC_PREREQ (4, 7) || !defined (__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 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
Commit	Line	Data
f3bdd5f8	1	/* Atomic operations. Pure ARM version.
b168057a	2	Copyright (C) 2002-2015 Free Software Foundation, Inc.
f3bdd5f8 RM	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	<http://www.gnu.org/licenses/>. */
	18
	19	#include <stdint.h>
	20
	21	typedef int8_t atomic8_t;
	22	typedef uint8_t uatomic8_t;
	23	typedef int_fast8_t atomic_fast8_t;
	24	typedef uint_fast8_t uatomic_fast8_t;
	25
	26	typedef int32_t atomic32_t;
	27	typedef uint32_t uatomic32_t;
	28	typedef int_fast32_t atomic_fast32_t;
	29	typedef uint_fast32_t uatomic_fast32_t;
	30
	31	typedef intptr_t atomicptr_t;
	32	typedef uintptr_t uatomicptr_t;
	33	typedef intmax_t atomic_max_t;
	34	typedef uintmax_t uatomic_max_t;
	35
1ea339b6 TR	36	#define __HAVE_64B_ATOMICS 0
	37	#define USE_ATOMIC_COMPILER_BUILTINS 0
	38
f3bdd5f8 RM	39	void __arm_link_error (void);
f3bdd5f8 RM	40
f3bdd5f8 RM	41	#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
	42	# define atomic_full_barrier() __sync_synchronize ()
	43	#else
	44	# define atomic_full_barrier() __arm_assisted_full_barrier ()
	45	#endif
	46
	47	/* An OS-specific bits/atomic.h file will define this macro if
	48	the OS can provide something. If not, we'll fail to build
	49	with a compiler that doesn't supply the operation. */
	50	#ifndef __arm_assisted_full_barrier
	51	# define __arm_assisted_full_barrier() __arm_link_error()
	52	#endif
	53
d70d6205 MK	54	/* Use the atomic builtins provided by GCC in case the backend provides
	55	a pattern to do this efficiently. */
	56	#if __GNUC_PREREQ (4, 7) && defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
f3bdd5f8	57
d70d6205 MK	58	# define atomic_exchange_acq(mem, value) \
	59	__atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
	60
	61	# define atomic_exchange_rel(mem, value) \
	62	__atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
	63
	64	/* Atomic exchange (without compare). */
	65
	66	# define __arch_exchange_8_int(mem, newval, model) \
	67	(__arm_link_error (), (typeof (*mem)) 0)
	68
	69	# define __arch_exchange_16_int(mem, newval, model) \
	70	(__arm_link_error (), (typeof (*mem)) 0)
	71
	72	# define __arch_exchange_32_int(mem, newval, model) \
	73	__atomic_exchange_n (mem, newval, model)
	74
	75	# define __arch_exchange_64_int(mem, newval, model) \
	76	(__arm_link_error (), (typeof (*mem)) 0)
	77
	78	/* Compare and exchange with "acquire" semantics, ie barrier after. */
	79
	80	# define atomic_compare_and_exchange_bool_acq(mem, new, old) \
	81	__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
	82	mem, new, old, __ATOMIC_ACQUIRE)
	83
	84	# define atomic_compare_and_exchange_val_acq(mem, new, old) \
	85	__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
	86	mem, new, old, __ATOMIC_ACQUIRE)
	87
	88	/* Compare and exchange with "release" semantics, ie barrier before. */
	89
	90	# define atomic_compare_and_exchange_bool_rel(mem, new, old) \
	91	__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
	92	mem, new, old, __ATOMIC_RELEASE)
	93
	94	# define atomic_compare_and_exchange_val_rel(mem, new, old) \
	95	__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
	96	mem, new, old, __ATOMIC_RELEASE)
	97
	98	/* Compare and exchange.
	99	For all "bool" routines, we return FALSE if exchange succesful. */
	100
	101	# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
57977c4b	102	({__arm_link_error (); 0; })
d70d6205 MK	103
d70d6205 MK	104	# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
57977c4b	105	({__arm_link_error (); 0; })
d70d6205 MK	106
	107	# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
	108	({ \
	109	typeof (*mem) __oldval = (oldval); \
	110	!__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
	111	model, __ATOMIC_RELAXED); \
	112	})
	113
	114	# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
57977c4b	115	({__arm_link_error (); 0; })
d70d6205 MK	116
	117	# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
	118	({__arm_link_error (); oldval; })
	119
	120	# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
	121	({__arm_link_error (); oldval; })
	122
	123	# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
	124	({ \
	125	typeof (*mem) __oldval = (oldval); \
	126	__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
	127	model, __ATOMIC_RELAXED); \
	128	__oldval; \
	129	})
	130
	131	# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
	132	({__arm_link_error (); oldval; })
	133
	134	#elif defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
	135	/* Atomic compare and exchange. */
f3bdd5f8 RM	136	# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
	137	__sync_val_compare_and_swap ((mem), (oldval), (newval))
	138	#else
	139	# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
eaf6f205	140	__arm_assisted_compare_and_exchange_val_32_acq ((mem), (newval), (oldval))
f3bdd5f8 RM	141	#endif
f3bdd5f8 RM	142
d70d6205	143	#if !__GNUC_PREREQ (4, 7) \|\| !defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
f3bdd5f8 RM	144	/* We don't support atomic operations on any non-word types.
f3bdd5f8 RM	145	So make them link errors. */
d70d6205	146	# define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
f3bdd5f8 RM	147	({ __arm_link_error (); oldval; })
f3bdd5f8 RM	148
d70d6205	149	# define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
f3bdd5f8 RM	150	({ __arm_link_error (); oldval; })
f3bdd5f8 RM	151
d70d6205	152	# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
f3bdd5f8	153	({ __arm_link_error (); oldval; })
d70d6205	154	#endif
f3bdd5f8 RM	155
	156	/* An OS-specific bits/atomic.h file will define this macro if
	157	the OS can provide something. If not, we'll fail to build
	158	with a compiler that doesn't supply the operation. */
	159	#ifndef __arm_assisted_compare_and_exchange_val_32_acq
	160	# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \
	161	({ __arm_link_error (); oldval; })
	162	#endif