Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef ANDROID_CUTILS_ATOMIC_ARM_H |
| 18 | #define ANDROID_CUTILS_ATOMIC_ARM_H |
| 19 | |
| 20 | #include <stdint.h> |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 21 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 22 | #ifndef ANDROID_ATOMIC_INLINE |
| 23 | #define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline)) |
| 24 | #endif |
| 25 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 26 | extern ANDROID_ATOMIC_INLINE void android_compiler_barrier() |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 27 | { |
| 28 | __asm__ __volatile__ ("" : : : "memory"); |
| 29 | } |
| 30 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 31 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier() |
| 32 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 33 | #if ANDROID_SMP == 0 |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 34 | android_compiler_barrier(); |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 35 | #else |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 36 | __asm__ __volatile__ ("dmb" : : : "memory"); |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 37 | #endif |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier() |
| 41 | { |
| 42 | #if ANDROID_SMP == 0 |
| 43 | android_compiler_barrier(); |
| 44 | #else |
| 45 | __asm__ __volatile__ ("dmb st" : : : "memory"); |
| 46 | #endif |
| 47 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 48 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 49 | extern ANDROID_ATOMIC_INLINE |
| 50 | int32_t android_atomic_acquire_load(volatile const int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 51 | { |
| 52 | int32_t value = *ptr; |
| 53 | android_memory_barrier(); |
| 54 | return value; |
| 55 | } |
| 56 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 57 | extern ANDROID_ATOMIC_INLINE |
| 58 | int32_t android_atomic_release_load(volatile const int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 59 | { |
| 60 | android_memory_barrier(); |
| 61 | return *ptr; |
| 62 | } |
| 63 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 64 | extern ANDROID_ATOMIC_INLINE |
| 65 | void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 66 | { |
| 67 | *ptr = value; |
| 68 | android_memory_barrier(); |
| 69 | } |
| 70 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 71 | extern ANDROID_ATOMIC_INLINE |
| 72 | void android_atomic_release_store(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 73 | { |
| 74 | android_memory_barrier(); |
| 75 | *ptr = value; |
| 76 | } |
| 77 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 78 | extern ANDROID_ATOMIC_INLINE |
| 79 | int android_atomic_cas(int32_t old_value, int32_t new_value, |
| 80 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 81 | { |
| 82 | int32_t prev, status; |
| 83 | do { |
| 84 | __asm__ __volatile__ ("ldrex %0, [%3]\n" |
| 85 | "mov %1, #0\n" |
| 86 | "teq %0, %4\n" |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 87 | #ifdef __thumb2__ |
| 88 | "it eq\n" |
| 89 | #endif |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 90 | "strexeq %1, %5, [%3]" |
| 91 | : "=&r" (prev), "=&r" (status), "+m"(*ptr) |
| 92 | : "r" (ptr), "Ir" (old_value), "r" (new_value) |
| 93 | : "cc"); |
| 94 | } while (__builtin_expect(status != 0, 0)); |
| 95 | return prev != old_value; |
| 96 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 97 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 98 | extern ANDROID_ATOMIC_INLINE |
| 99 | int android_atomic_acquire_cas(int32_t old_value, int32_t new_value, |
| 100 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 101 | { |
| 102 | int status = android_atomic_cas(old_value, new_value, ptr); |
| 103 | android_memory_barrier(); |
| 104 | return status; |
| 105 | } |
| 106 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 107 | extern ANDROID_ATOMIC_INLINE |
| 108 | int android_atomic_release_cas(int32_t old_value, int32_t new_value, |
| 109 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 110 | { |
| 111 | android_memory_barrier(); |
| 112 | return android_atomic_cas(old_value, new_value, ptr); |
| 113 | } |
| 114 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 115 | extern ANDROID_ATOMIC_INLINE |
| 116 | int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 117 | { |
| 118 | int32_t prev, tmp, status; |
| 119 | android_memory_barrier(); |
| 120 | do { |
| 121 | __asm__ __volatile__ ("ldrex %0, [%4]\n" |
| 122 | "add %1, %0, %5\n" |
| 123 | "strex %2, %1, [%4]" |
| 124 | : "=&r" (prev), "=&r" (tmp), |
| 125 | "=&r" (status), "+m" (*ptr) |
| 126 | : "r" (ptr), "Ir" (increment) |
| 127 | : "cc"); |
| 128 | } while (__builtin_expect(status != 0, 0)); |
| 129 | return prev; |
| 130 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 131 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 132 | extern ANDROID_ATOMIC_INLINE int32_t android_atomic_inc(volatile int32_t *addr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 133 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 134 | return android_atomic_add(1, addr); |
| 135 | } |
| 136 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 137 | extern ANDROID_ATOMIC_INLINE int32_t android_atomic_dec(volatile int32_t *addr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 138 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 139 | return android_atomic_add(-1, addr); |
| 140 | } |
| 141 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 142 | extern ANDROID_ATOMIC_INLINE |
| 143 | int32_t android_atomic_and(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 144 | { |
| 145 | int32_t prev, tmp, status; |
| 146 | android_memory_barrier(); |
| 147 | do { |
| 148 | __asm__ __volatile__ ("ldrex %0, [%4]\n" |
| 149 | "and %1, %0, %5\n" |
| 150 | "strex %2, %1, [%4]" |
| 151 | : "=&r" (prev), "=&r" (tmp), |
| 152 | "=&r" (status), "+m" (*ptr) |
| 153 | : "r" (ptr), "Ir" (value) |
| 154 | : "cc"); |
| 155 | } while (__builtin_expect(status != 0, 0)); |
| 156 | return prev; |
| 157 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 158 | |
Ian Rogers | 62980e8 | 2013-01-31 16:40:21 -0800 | [diff] [blame] | 159 | extern ANDROID_ATOMIC_INLINE |
| 160 | int32_t android_atomic_or(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 161 | { |
| 162 | int32_t prev, tmp, status; |
| 163 | android_memory_barrier(); |
| 164 | do { |
| 165 | __asm__ __volatile__ ("ldrex %0, [%4]\n" |
| 166 | "orr %1, %0, %5\n" |
| 167 | "strex %2, %1, [%4]" |
| 168 | : "=&r" (prev), "=&r" (tmp), |
| 169 | "=&r" (status), "+m" (*ptr) |
| 170 | : "r" (ptr), "Ir" (value) |
| 171 | : "cc"); |
| 172 | } while (__builtin_expect(status != 0, 0)); |
| 173 | return prev; |
| 174 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 175 | |
| 176 | #endif /* ANDROID_CUTILS_ATOMIC_ARM_H */ |