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> |
| 21 | #include <machine/cpu-features.h> |
| 22 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 23 | #ifndef ANDROID_ATOMIC_INLINE |
| 24 | #define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline)) |
| 25 | #endif |
| 26 | |
| 27 | extern ANDROID_ATOMIC_INLINE void android_compiler_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 28 | { |
| 29 | __asm__ __volatile__ ("" : : : "memory"); |
| 30 | } |
| 31 | |
| 32 | #if ANDROID_SMP == 0 |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 33 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 34 | { |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 35 | android_compiler_barrier(); |
| 36 | } |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 37 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void) |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 38 | { |
| 39 | android_compiler_barrier(); |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 40 | } |
| 41 | #elif defined(__ARM_HAVE_DMB) |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 42 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 43 | { |
| 44 | __asm__ __volatile__ ("dmb" : : : "memory"); |
| 45 | } |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 46 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void) |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 47 | { |
Andy McFadden | 2bf937e | 2010-10-01 11:29:48 -0700 | [diff] [blame] | 48 | __asm__ __volatile__ ("dmb st" : : : "memory"); |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 49 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 50 | #elif defined(__ARM_HAVE_LDREX_STREX) |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 51 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 52 | { |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 53 | __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory"); |
| 54 | } |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 55 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void) |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 56 | { |
| 57 | android_memory_barrier(); |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 58 | } |
| 59 | #else |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 60 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 61 | { |
| 62 | typedef void (kuser_memory_barrier)(void); |
| 63 | (*(kuser_memory_barrier *)0xffff0fa0)(); |
| 64 | } |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 65 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void) |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 66 | { |
| 67 | android_memory_barrier(); |
| 68 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 69 | #endif |
| 70 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 71 | extern ANDROID_ATOMIC_INLINE |
| 72 | int32_t android_atomic_acquire_load(volatile const int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 73 | { |
| 74 | int32_t value = *ptr; |
| 75 | android_memory_barrier(); |
| 76 | return value; |
| 77 | } |
| 78 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 79 | extern ANDROID_ATOMIC_INLINE |
| 80 | int32_t android_atomic_release_load(volatile const int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 81 | { |
| 82 | android_memory_barrier(); |
| 83 | return *ptr; |
| 84 | } |
| 85 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 86 | extern ANDROID_ATOMIC_INLINE void |
| 87 | android_atomic_acquire_store(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 88 | { |
| 89 | *ptr = value; |
| 90 | android_memory_barrier(); |
| 91 | } |
| 92 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 93 | extern ANDROID_ATOMIC_INLINE void |
| 94 | android_atomic_release_store(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 95 | { |
| 96 | android_memory_barrier(); |
| 97 | *ptr = value; |
| 98 | } |
| 99 | |
| 100 | #if defined(__thumb__) |
| 101 | extern int android_atomic_cas(int32_t old_value, int32_t new_value, |
| 102 | volatile int32_t *ptr); |
| 103 | #elif defined(__ARM_HAVE_LDREX_STREX) |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 104 | extern ANDROID_ATOMIC_INLINE int |
| 105 | android_atomic_cas(int32_t old_value, int32_t new_value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 106 | { |
| 107 | int32_t prev, status; |
| 108 | do { |
| 109 | __asm__ __volatile__ ("ldrex %0, [%3]\n" |
| 110 | "mov %1, #0\n" |
| 111 | "teq %0, %4\n" |
| 112 | "strexeq %1, %5, [%3]" |
| 113 | : "=&r" (prev), "=&r" (status), "+m"(*ptr) |
| 114 | : "r" (ptr), "Ir" (old_value), "r" (new_value) |
| 115 | : "cc"); |
| 116 | } while (__builtin_expect(status != 0, 0)); |
| 117 | return prev != old_value; |
| 118 | } |
| 119 | #else |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 120 | extern ANDROID_ATOMIC_INLINE int |
| 121 | android_atomic_cas(int32_t old_value, int32_t new_value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 122 | { |
| 123 | typedef int (kuser_cmpxchg)(int32_t, int32_t, volatile int32_t *); |
| 124 | int32_t prev, status; |
| 125 | prev = *ptr; |
| 126 | do { |
| 127 | status = (*(kuser_cmpxchg *)0xffff0fc0)(old_value, new_value, ptr); |
| 128 | if (__builtin_expect(status == 0, 1)) |
| 129 | return 0; |
| 130 | prev = *ptr; |
| 131 | } while (prev == old_value); |
| 132 | return 1; |
| 133 | } |
| 134 | #endif |
| 135 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 136 | extern ANDROID_ATOMIC_INLINE int |
| 137 | android_atomic_acquire_cas(int32_t old_value, |
| 138 | int32_t new_value, |
| 139 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 140 | { |
| 141 | int status = android_atomic_cas(old_value, new_value, ptr); |
| 142 | android_memory_barrier(); |
| 143 | return status; |
| 144 | } |
| 145 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 146 | extern ANDROID_ATOMIC_INLINE int |
| 147 | android_atomic_release_cas(int32_t old_value, |
| 148 | int32_t new_value, |
| 149 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 150 | { |
| 151 | android_memory_barrier(); |
| 152 | return android_atomic_cas(old_value, new_value, ptr); |
| 153 | } |
| 154 | |
| 155 | |
| 156 | #if defined(__thumb__) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 157 | extern int32_t android_atomic_add(int32_t increment, |
| 158 | volatile int32_t *ptr); |
| 159 | #elif defined(__ARM_HAVE_LDREX_STREX) |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 160 | extern ANDROID_ATOMIC_INLINE int32_t |
| 161 | android_atomic_add(int32_t increment, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 162 | { |
| 163 | int32_t prev, tmp, status; |
| 164 | android_memory_barrier(); |
| 165 | do { |
| 166 | __asm__ __volatile__ ("ldrex %0, [%4]\n" |
| 167 | "add %1, %0, %5\n" |
| 168 | "strex %2, %1, [%4]" |
| 169 | : "=&r" (prev), "=&r" (tmp), |
| 170 | "=&r" (status), "+m" (*ptr) |
| 171 | : "r" (ptr), "Ir" (increment) |
| 172 | : "cc"); |
| 173 | } while (__builtin_expect(status != 0, 0)); |
| 174 | return prev; |
| 175 | } |
| 176 | #else |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 177 | extern ANDROID_ATOMIC_INLINE int32_t |
| 178 | android_atomic_add(int32_t increment, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 179 | { |
| 180 | int32_t prev, status; |
| 181 | android_memory_barrier(); |
| 182 | do { |
| 183 | prev = *ptr; |
| 184 | status = android_atomic_cas(prev, prev + increment, ptr); |
| 185 | } while (__builtin_expect(status != 0, 0)); |
| 186 | return prev; |
| 187 | } |
| 188 | #endif |
| 189 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 190 | 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] | 191 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 192 | return android_atomic_add(1, addr); |
| 193 | } |
| 194 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 195 | 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] | 196 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 197 | return android_atomic_add(-1, addr); |
| 198 | } |
| 199 | |
| 200 | #if defined(__thumb__) |
| 201 | extern int32_t android_atomic_and(int32_t value, volatile int32_t *ptr); |
| 202 | #elif defined(__ARM_HAVE_LDREX_STREX) |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 203 | extern ANDROID_ATOMIC_INLINE int32_t |
| 204 | android_atomic_and(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 205 | { |
| 206 | int32_t prev, tmp, status; |
| 207 | android_memory_barrier(); |
| 208 | do { |
| 209 | __asm__ __volatile__ ("ldrex %0, [%4]\n" |
| 210 | "and %1, %0, %5\n" |
| 211 | "strex %2, %1, [%4]" |
| 212 | : "=&r" (prev), "=&r" (tmp), |
| 213 | "=&r" (status), "+m" (*ptr) |
| 214 | : "r" (ptr), "Ir" (value) |
| 215 | : "cc"); |
| 216 | } while (__builtin_expect(status != 0, 0)); |
| 217 | return prev; |
| 218 | } |
| 219 | #else |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 220 | extern ANDROID_ATOMIC_INLINE int32_t |
| 221 | android_atomic_and(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 222 | { |
| 223 | int32_t prev, status; |
| 224 | android_memory_barrier(); |
| 225 | do { |
| 226 | prev = *ptr; |
| 227 | status = android_atomic_cas(prev, prev & value, ptr); |
| 228 | } while (__builtin_expect(status != 0, 0)); |
| 229 | return prev; |
| 230 | } |
| 231 | #endif |
| 232 | |
| 233 | #if defined(__thumb__) |
| 234 | extern int32_t android_atomic_or(int32_t value, volatile int32_t *ptr); |
| 235 | #elif defined(__ARM_HAVE_LDREX_STREX) |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 236 | extern ANDROID_ATOMIC_INLINE int32_t |
| 237 | android_atomic_or(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 238 | { |
| 239 | int32_t prev, tmp, status; |
| 240 | android_memory_barrier(); |
| 241 | do { |
| 242 | __asm__ __volatile__ ("ldrex %0, [%4]\n" |
| 243 | "orr %1, %0, %5\n" |
| 244 | "strex %2, %1, [%4]" |
| 245 | : "=&r" (prev), "=&r" (tmp), |
| 246 | "=&r" (status), "+m" (*ptr) |
| 247 | : "r" (ptr), "Ir" (value) |
| 248 | : "cc"); |
| 249 | } while (__builtin_expect(status != 0, 0)); |
| 250 | return prev; |
| 251 | } |
| 252 | #else |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame^] | 253 | extern ANDROID_ATOMIC_INLINE int32_t |
| 254 | android_atomic_or(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 255 | { |
| 256 | int32_t prev, status; |
| 257 | android_memory_barrier(); |
| 258 | do { |
| 259 | prev = *ptr; |
| 260 | status = android_atomic_cas(prev, prev | value, ptr); |
| 261 | } while (__builtin_expect(status != 0, 0)); |
| 262 | return prev; |
| 263 | } |
| 264 | #endif |
| 265 | |
| 266 | #endif /* ANDROID_CUTILS_ATOMIC_ARM_H */ |