| 1 | /* |
| 2 | * Copyright (c) 2003 Hewlett-Packard Development Company, L.P. |
| 3 | * Copyright (c) 2009-2021 Ivan Maidanski |
| 4 | * |
| 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | * of this software and associated documentation files (the "Software"), to deal |
| 7 | * in the Software without restriction, including without limitation the rights |
| 8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | * copies of the Software, and to permit persons to whom the Software is |
| 10 | * furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be included in |
| 13 | * all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 21 | * SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | /* Some ARM slide set, if it has been read correctly, claims that Loads */ |
| 25 | /* followed by either a Load or a Store are ordered, but nothing else. */ |
| 26 | /* It is assumed that Windows interrupt handlers clear the LL/SC flag. */ |
| 27 | /* Unaligned accesses are not guaranteed to be atomic. */ |
| 28 | #include "../all_aligned_atomic_load_store.h" |
| 29 | |
| 30 | #define AO_T_IS_INT |
| 31 | |
| 32 | #ifndef AO_ASSUME_WINDOWS98 |
| 33 | /* CAS is always available */ |
| 34 | # define AO_ASSUME_WINDOWS98 |
| 35 | #endif |
| 36 | #include "common32_defs.h" |
| 37 | |
| 38 | /* If only a single processor is used, we can define AO_UNIPROCESSOR. */ |
| 39 | #ifdef AO_UNIPROCESSOR |
| 40 | AO_INLINE void AO_nop_full(void) |
| 41 | { |
| 42 | AO_compiler_barrier(); |
| 43 | } |
| 44 | # define AO_HAVE_nop_full |
| 45 | #else |
| 46 | /* AO_nop_full() is emulated using AO_test_and_set_full(). */ |
| 47 | #endif |
| 48 | |
| 49 | #ifndef AO_HAVE_test_and_set_full |
| 50 | # include "../test_and_set_t_is_ao_t.h" |
| 51 | /* AO_test_and_set_full() is emulated. */ |
| 52 | #endif |
| 53 | |
| 54 | #if _M_ARM >= 7 && !defined(AO_NO_DOUBLE_CAS) |
| 55 | |
| 56 | # include "../standard_ao_double_t.h" |
| 57 | |
| 58 | /* These intrinsics are supposed to use LDREXD/STREXD. */ |
| 59 | # pragma intrinsic (_InterlockedCompareExchange64) |
| 60 | # pragma intrinsic (_InterlockedCompareExchange64_acq) |
| 61 | # pragma intrinsic (_InterlockedCompareExchange64_nf) |
| 62 | # pragma intrinsic (_InterlockedCompareExchange64_rel) |
| 63 | |
| 64 | AO_INLINE int |
| 65 | AO_double_compare_and_swap(volatile AO_double_t *addr, |
| 66 | AO_double_t old_val, AO_double_t new_val) |
| 67 | { |
| 68 | AO_ASSERT_ADDR_ALIGNED(addr); |
| 69 | return (double_ptr_storage)_InterlockedCompareExchange64_nf( |
| 70 | (__int64 volatile *)addr, |
| 71 | new_val.AO_whole /* exchange */, |
| 72 | old_val.AO_whole) == old_val.AO_whole; |
| 73 | } |
| 74 | # define AO_HAVE_double_compare_and_swap |
| 75 | |
| 76 | AO_INLINE int |
| 77 | AO_double_compare_and_swap_acquire(volatile AO_double_t *addr, |
| 78 | AO_double_t old_val, AO_double_t new_val) |
| 79 | { |
| 80 | AO_ASSERT_ADDR_ALIGNED(addr); |
| 81 | return (double_ptr_storage)_InterlockedCompareExchange64_acq( |
| 82 | (__int64 volatile *)addr, |
| 83 | new_val.AO_whole /* exchange */, |
| 84 | old_val.AO_whole) == old_val.AO_whole; |
| 85 | } |
| 86 | # define AO_HAVE_double_compare_and_swap_acquire |
| 87 | |
| 88 | AO_INLINE int |
| 89 | AO_double_compare_and_swap_release(volatile AO_double_t *addr, |
| 90 | AO_double_t old_val, AO_double_t new_val) |
| 91 | { |
| 92 | AO_ASSERT_ADDR_ALIGNED(addr); |
| 93 | return (double_ptr_storage)_InterlockedCompareExchange64_rel( |
| 94 | (__int64 volatile *)addr, |
| 95 | new_val.AO_whole /* exchange */, |
| 96 | old_val.AO_whole) == old_val.AO_whole; |
| 97 | } |
| 98 | # define AO_HAVE_double_compare_and_swap_release |
| 99 | |
| 100 | AO_INLINE int |
| 101 | AO_double_compare_and_swap_full(volatile AO_double_t *addr, |
| 102 | AO_double_t old_val, AO_double_t new_val) |
| 103 | { |
| 104 | AO_ASSERT_ADDR_ALIGNED(addr); |
| 105 | return (double_ptr_storage)_InterlockedCompareExchange64( |
| 106 | (__int64 volatile *)addr, |
| 107 | new_val.AO_whole /* exchange */, |
| 108 | old_val.AO_whole) == old_val.AO_whole; |
| 109 | } |
| 110 | # define AO_HAVE_double_compare_and_swap_full |
| 111 | |
| 112 | #endif /* _M_ARM >= 7 && !AO_NO_DOUBLE_CAS */ |
| 113 | |