xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Atomic operations. Pure ARM version. |
| 2 | Copyright (C) 2002-2016 Free Software Foundation, Inc. |
| 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 | |
| 36 | #define __HAVE_64B_ATOMICS 0 |
| 37 | #define USE_ATOMIC_COMPILER_BUILTINS 0 |
| 38 | |
| 39 | void __arm_link_error (void); |
| 40 | |
| 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 atomic-machine.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 | |
| 54 | /* Use the atomic builtins provided by GCC in case the backend provides |
| 55 | a pattern to do this efficiently. */ |
| 56 | #ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 |
| 57 | |
| 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) \ |
| 102 | ({__arm_link_error (); 0; }) |
| 103 | |
| 104 | # define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \ |
| 105 | ({__arm_link_error (); 0; }) |
| 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) \ |
| 115 | ({__arm_link_error (); 0; }) |
| 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 | #else |
| 135 | # define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ |
| 136 | __arm_assisted_compare_and_exchange_val_32_acq ((mem), (newval), (oldval)) |
| 137 | #endif |
| 138 | |
| 139 | #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 |
| 140 | /* We don't support atomic operations on any non-word types. |
| 141 | So make them link errors. */ |
| 142 | # define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \ |
| 143 | ({ __arm_link_error (); oldval; }) |
| 144 | |
| 145 | # define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ |
| 146 | ({ __arm_link_error (); oldval; }) |
| 147 | |
| 148 | # define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ |
| 149 | ({ __arm_link_error (); oldval; }) |
| 150 | #endif |
| 151 | |
| 152 | /* An OS-specific atomic-machine.h file will define this macro if |
| 153 | the OS can provide something. If not, we'll fail to build |
| 154 | with a compiler that doesn't supply the operation. */ |
| 155 | #ifndef __arm_assisted_compare_and_exchange_val_32_acq |
| 156 | # define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \ |
| 157 | ({ __arm_link_error (); oldval; }) |
| 158 | #endif |