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Diffstat (limited to 'sysdeps/arm/bits/atomic.h')
| -rw-r--r-- | sysdeps/arm/bits/atomic.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/sysdeps/arm/bits/atomic.h b/sysdeps/arm/bits/atomic.h new file mode 100644 index 0000000000..c2d5be5703 --- /dev/null +++ b/sysdeps/arm/bits/atomic.h @@ -0,0 +1,159 @@ +/* Atomic operations. Pure ARM version. + Copyright (C) 2002-2014 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); + +#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 (); oldval; }) + +# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \ + ({__arm_link_error (); oldval; }) + +# 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 (); oldval; }) + +# 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 |