| /* 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 |