OLD | NEW |
1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 // This file is an internal atomic implementation, use atomicops.h instead. | 28 // This file is an internal atomic implementation, use atomicops.h instead. |
29 | 29 |
30 #ifndef V8_ATOMICOPS_INTERNALS_ARM_GCC_H_ | 30 #ifndef V8_ATOMICOPS_INTERNALS_ARM_GCC_H_ |
31 #define V8_ATOMICOPS_INTERNALS_ARM_GCC_H_ | 31 #define V8_ATOMICOPS_INTERNALS_ARM_GCC_H_ |
32 | 32 |
33 namespace v8 { | 33 namespace v8 { |
34 namespace internal { | 34 namespace internal { |
35 | 35 |
36 inline void MemoryBarrier() { /* Not used. */ } | 36 inline void MemoryBarrier() { |
| 37 __asm__ __volatile__ ( // NOLINT |
| 38 "dmb ish \n\t" // Data memory barrier. |
| 39 ::: "memory" |
| 40 ); // NOLINT |
| 41 } |
| 42 |
37 | 43 |
38 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, | 44 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
39 Atomic32 old_value, | 45 Atomic32 old_value, |
40 Atomic32 new_value) { | 46 Atomic32 new_value) { |
41 Atomic32 prev; | 47 Atomic32 prev; |
42 int32_t temp; | 48 int32_t temp; |
43 | 49 |
44 __asm__ __volatile__ ( // NOLINT | 50 __asm__ __volatile__ ( // NOLINT |
45 "0: \n\t" | 51 "0: \n\t" |
46 "ldxr %w[prev], [%[ptr]] \n\t" // Load the previous value. | 52 "ldxr %w[prev], %[ptr] \n\t" // Load the previous value. |
47 "cmp %w[prev], %w[old_value] \n\t" | 53 "cmp %w[prev], %w[old_value] \n\t" |
48 "bne 1f \n\t" | 54 "bne 1f \n\t" |
49 "stxr %w[temp], %w[new_value], [%[ptr]]\n\t" // Try to store the new value. | 55 "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value. |
50 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. | 56 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. |
51 "1: \n\t" | 57 "1: \n\t" |
52 "clrex \n\t" // In case we didn't swap. | 58 "clrex \n\t" // In case we didn't swap. |
53 : [prev]"=&r" (prev), | 59 : [prev]"=&r" (prev), |
54 [temp]"=&r" (temp) | 60 [temp]"=&r" (temp), |
55 : [ptr]"r" (ptr), | 61 [ptr]"+Q" (*ptr) |
56 [old_value]"r" (old_value), | 62 : [old_value]"r" (old_value), |
57 [new_value]"r" (new_value) | 63 [new_value]"r" (new_value) |
58 : "memory", "cc" | 64 : "memory", "cc" |
59 ); // NOLINT | 65 ); // NOLINT |
60 | 66 |
61 return prev; | 67 return prev; |
62 } | 68 } |
63 | 69 |
64 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, | 70 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, |
65 Atomic32 new_value) { | 71 Atomic32 new_value) { |
66 Atomic32 result; | 72 Atomic32 result; |
67 int32_t temp; | 73 int32_t temp; |
68 | 74 |
69 __asm__ __volatile__ ( // NOLINT | 75 __asm__ __volatile__ ( // NOLINT |
70 "0: \n\t" | 76 "0: \n\t" |
71 "ldxr %w[result], [%[ptr]] \n\t" // Load the previous value. | 77 "ldxr %w[result], %[ptr] \n\t" // Load the previous value. |
72 "stxr %w[temp], %w[new_value], [%[ptr]]\n\t" // Try to store the new value. | 78 "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value. |
73 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. | 79 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. |
74 : [result]"=&r" (result), | 80 : [result]"=&r" (result), |
75 [temp]"=&r" (temp) | 81 [temp]"=&r" (temp), |
76 : [ptr]"r" (ptr), | 82 [ptr]"+Q" (*ptr) |
77 [new_value]"r" (new_value) | 83 : [new_value]"r" (new_value) |
78 : "memory" | 84 : "memory" |
79 ); // NOLINT | 85 ); // NOLINT |
80 | 86 |
81 return result; | 87 return result; |
82 } | 88 } |
83 | 89 |
84 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, | 90 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, |
85 Atomic32 increment) { | 91 Atomic32 increment) { |
86 Atomic32 result; | 92 Atomic32 result; |
87 int32_t temp; | 93 int32_t temp; |
88 | 94 |
89 __asm__ __volatile__ ( // NOLINT | 95 __asm__ __volatile__ ( // NOLINT |
90 "0: \n\t" | 96 "0: \n\t" |
91 "ldxr %w[result], [%[ptr]] \n\t" // Load the previous value. | 97 "ldxr %w[result], %[ptr] \n\t" // Load the previous value. |
92 "add %w[result], %w[result], %w[increment]\n\t" | 98 "add %w[result], %w[result], %w[increment]\n\t" |
93 "stxr %w[temp], %w[result], [%[ptr]] \n\t" // Try to store the result. | 99 "stxr %w[temp], %w[result], %[ptr] \n\t" // Try to store the result. |
94 "cbnz %w[temp], 0b \n\t" // Retry on failure. | 100 "cbnz %w[temp], 0b \n\t" // Retry on failure. |
95 : [result]"=&r" (result), | 101 : [result]"=&r" (result), |
96 [temp]"=&r" (temp) | 102 [temp]"=&r" (temp), |
97 : [ptr]"r" (ptr), | 103 [ptr]"+Q" (*ptr) |
98 [increment]"r" (increment) | 104 : [increment]"r" (increment) |
99 : "memory" | 105 : "memory" |
100 ); // NOLINT | 106 ); // NOLINT |
101 | 107 |
102 return result; | 108 return result; |
103 } | 109 } |
104 | 110 |
105 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, | 111 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, |
106 Atomic32 increment) { | 112 Atomic32 increment) { |
107 Atomic32 result; | 113 MemoryBarrier(); |
108 int32_t temp; | 114 Atomic32 result = NoBarrier_AtomicIncrement(ptr, increment); |
109 | 115 MemoryBarrier(); |
110 __asm__ __volatile__ ( // NOLINT | |
111 "dmb ish \n\t" // Data memory barrier. | |
112 "0: \n\t" | |
113 "ldxr %w[result], [%[ptr]] \n\t" // Load the previous value. | |
114 "add %w[result], %w[result], %w[increment]\n\t" | |
115 "stxr %w[temp], %w[result], [%[ptr]] \n\t" // Try to store the result. | |
116 "cbnz %w[temp], 0b \n\t" // Retry on failure. | |
117 "dmb ish \n\t" // Data memory barrier. | |
118 : [result]"=&r" (result), | |
119 [temp]"=&r" (temp) | |
120 : [ptr]"r" (ptr), | |
121 [increment]"r" (increment) | |
122 : "memory" | |
123 ); // NOLINT | |
124 | 116 |
125 return result; | 117 return result; |
126 } | 118 } |
127 | 119 |
128 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, | 120 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, |
129 Atomic32 old_value, | 121 Atomic32 old_value, |
130 Atomic32 new_value) { | 122 Atomic32 new_value) { |
131 Atomic32 prev; | 123 Atomic32 prev; |
132 int32_t temp; | 124 int32_t temp; |
133 | 125 |
134 __asm__ __volatile__ ( // NOLINT | 126 __asm__ __volatile__ ( // NOLINT |
135 "0: \n\t" | 127 "0: \n\t" |
136 "ldxr %w[prev], [%[ptr]] \n\t" // Load the previous value. | 128 "ldxr %w[prev], %[ptr] \n\t" // Load the previous value. |
137 "cmp %w[prev], %w[old_value] \n\t" | 129 "cmp %w[prev], %w[old_value] \n\t" |
138 "bne 1f \n\t" | 130 "bne 1f \n\t" |
139 "stxr %w[temp], %w[new_value], [%[ptr]]\n\t" // Try to store the new value. | 131 "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value. |
140 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. | 132 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. |
141 "dmb ish \n\t" // Data memory barrier. | 133 "dmb ish \n\t" // Data memory barrier. |
142 "1: \n\t" | 134 "1: \n\t" |
143 // If the compare failed the 'dmb' is unnecessary, but we still need a | 135 // If the compare failed the 'dmb' is unnecessary, but we still need a |
144 // 'clrex'. | 136 // 'clrex'. |
145 "clrex \n\t" | 137 "clrex \n\t" |
146 : [prev]"=&r" (prev), | 138 : [prev]"=&r" (prev), |
147 [temp]"=&r" (temp) | 139 [temp]"=&r" (temp), |
148 : [ptr]"r" (ptr), | 140 [ptr]"+Q" (*ptr) |
149 [old_value]"r" (old_value), | 141 : [old_value]"r" (old_value), |
150 [new_value]"r" (new_value) | 142 [new_value]"r" (new_value) |
151 : "memory", "cc" | 143 : "memory", "cc" |
152 ); // NOLINT | 144 ); // NOLINT |
153 | 145 |
154 return prev; | 146 return prev; |
155 } | 147 } |
156 | 148 |
157 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, | 149 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, |
158 Atomic32 old_value, | 150 Atomic32 old_value, |
159 Atomic32 new_value) { | 151 Atomic32 new_value) { |
160 Atomic32 prev; | 152 Atomic32 prev; |
161 int32_t temp; | 153 int32_t temp; |
162 | 154 |
| 155 MemoryBarrier(); |
| 156 |
163 __asm__ __volatile__ ( // NOLINT | 157 __asm__ __volatile__ ( // NOLINT |
164 "dmb ish \n\t" // Data memory barrier. | |
165 "0: \n\t" | 158 "0: \n\t" |
166 "ldxr %w[prev], [%[ptr]] \n\t" // Load the previous value. | 159 "ldxr %w[prev], %[ptr] \n\t" // Load the previous value. |
167 "cmp %w[prev], %w[old_value] \n\t" | 160 "cmp %w[prev], %w[old_value] \n\t" |
168 "bne 1f \n\t" | 161 "bne 1f \n\t" |
169 "stxr %w[temp], %w[new_value], [%[ptr]]\n\t" // Try to store the new value. | 162 "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value. |
170 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. | 163 "cbnz %w[temp], 0b \n\t" // Retry if it did not work. |
171 "1: \n\t" | 164 "1: \n\t" |
172 // If the compare failed the we still need a 'clrex'. | 165 // If the compare failed the we still need a 'clrex'. |
173 "clrex \n\t" | 166 "clrex \n\t" |
174 : [prev]"=&r" (prev), | 167 : [prev]"=&r" (prev), |
175 [temp]"=&r" (temp) | 168 [temp]"=&r" (temp), |
176 : [ptr]"r" (ptr), | 169 [ptr]"+Q" (*ptr) |
177 [old_value]"r" (old_value), | 170 : [old_value]"r" (old_value), |
178 [new_value]"r" (new_value) | 171 [new_value]"r" (new_value) |
179 : "memory", "cc" | 172 : "memory", "cc" |
180 ); // NOLINT | 173 ); // NOLINT |
181 | 174 |
182 return prev; | 175 return prev; |
183 } | 176 } |
184 | 177 |
185 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { | 178 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { |
186 *ptr = value; | 179 *ptr = value; |
187 } | 180 } |
188 | 181 |
189 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) { | 182 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) { |
190 *ptr = value; | 183 *ptr = value; |
191 __asm__ __volatile__ ( // NOLINT | 184 MemoryBarrier(); |
192 "dmb ish \n\t" // Data memory barrier. | |
193 ::: "memory" // Prevent gcc from reordering before the store above. | |
194 ); // NOLINT | |
195 } | 185 } |
196 | 186 |
197 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { | 187 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { |
198 __asm__ __volatile__ ( // NOLINT | 188 MemoryBarrier(); |
199 "dmb ish \n\t" // Data memory barrier. | |
200 ::: "memory" // Prevent gcc from reordering after the store below. | |
201 ); // NOLINT | |
202 *ptr = value; | 189 *ptr = value; |
203 } | 190 } |
204 | 191 |
205 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { | 192 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { |
206 return *ptr; | 193 return *ptr; |
207 } | 194 } |
208 | 195 |
209 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { | 196 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { |
210 Atomic32 value = *ptr; | 197 Atomic32 value = *ptr; |
211 __asm__ __volatile__ ( // NOLINT | 198 MemoryBarrier(); |
212 "dmb ish \n\t" // Data memory barrier. | |
213 ::: "memory" // Prevent gcc from reordering before the load above. | |
214 ); // NOLINT | |
215 return value; | 199 return value; |
216 } | 200 } |
217 | 201 |
218 inline Atomic32 Release_Load(volatile const Atomic32* ptr) { | 202 inline Atomic32 Release_Load(volatile const Atomic32* ptr) { |
219 __asm__ __volatile__ ( // NOLINT | 203 MemoryBarrier(); |
220 "dmb ish \n\t" // Data memory barrier. | |
221 ::: "memory" // Prevent gcc from reordering after the load below. | |
222 ); // NOLINT | |
223 return *ptr; | 204 return *ptr; |
224 } | 205 } |
225 | 206 |
226 // 64-bit versions of the operations. | 207 // 64-bit versions of the operations. |
227 // See the 32-bit versions for comments. | 208 // See the 32-bit versions for comments. |
228 | 209 |
229 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr, | 210 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr, |
230 Atomic64 old_value, | 211 Atomic64 old_value, |
231 Atomic64 new_value) { | 212 Atomic64 new_value) { |
232 Atomic64 prev; | 213 Atomic64 prev; |
233 int32_t temp; | 214 int32_t temp; |
234 | 215 |
235 __asm__ __volatile__ ( // NOLINT | 216 __asm__ __volatile__ ( // NOLINT |
236 "0: \n\t" | 217 "0: \n\t" |
237 "ldxr %[prev], [%[ptr]] \n\t" | 218 "ldxr %[prev], %[ptr] \n\t" |
238 "cmp %[prev], %[old_value] \n\t" | 219 "cmp %[prev], %[old_value] \n\t" |
239 "bne 1f \n\t" | 220 "bne 1f \n\t" |
240 "stxr %w[temp], %[new_value], [%[ptr]] \n\t" | 221 "stxr %w[temp], %[new_value], %[ptr] \n\t" |
241 "cbnz %w[temp], 0b \n\t" | 222 "cbnz %w[temp], 0b \n\t" |
242 "1: \n\t" | 223 "1: \n\t" |
243 "clrex \n\t" | 224 "clrex \n\t" |
244 : [prev]"=&r" (prev), | 225 : [prev]"=&r" (prev), |
245 [temp]"=&r" (temp) | 226 [temp]"=&r" (temp), |
246 : [ptr]"r" (ptr), | 227 [ptr]"+Q" (*ptr) |
247 [old_value]"r" (old_value), | 228 : [old_value]"r" (old_value), |
248 [new_value]"r" (new_value) | 229 [new_value]"r" (new_value) |
249 : "memory", "cc" | 230 : "memory", "cc" |
250 ); // NOLINT | 231 ); // NOLINT |
251 | 232 |
252 return prev; | 233 return prev; |
253 } | 234 } |
254 | 235 |
255 inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, | 236 inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, |
256 Atomic64 new_value) { | 237 Atomic64 new_value) { |
257 Atomic64 result; | 238 Atomic64 result; |
258 int32_t temp; | 239 int32_t temp; |
259 | 240 |
260 __asm__ __volatile__ ( // NOLINT | 241 __asm__ __volatile__ ( // NOLINT |
261 "0: \n\t" | 242 "0: \n\t" |
262 "ldxr %[result], [%[ptr]] \n\t" | 243 "ldxr %[result], %[ptr] \n\t" |
263 "stxr %w[temp], %[new_value], [%[ptr]] \n\t" | 244 "stxr %w[temp], %[new_value], %[ptr] \n\t" |
264 "cbnz %w[temp], 0b \n\t" | 245 "cbnz %w[temp], 0b \n\t" |
265 : [result]"=&r" (result), | 246 : [result]"=&r" (result), |
266 [temp]"=&r" (temp) | 247 [temp]"=&r" (temp), |
267 : [ptr]"r" (ptr), | 248 [ptr]"+Q" (*ptr) |
268 [new_value]"r" (new_value) | 249 : [new_value]"r" (new_value) |
269 : "memory" | 250 : "memory" |
270 ); // NOLINT | 251 ); // NOLINT |
271 | 252 |
272 return result; | 253 return result; |
273 } | 254 } |
274 | 255 |
275 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, | 256 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, |
276 Atomic64 increment) { | 257 Atomic64 increment) { |
277 Atomic64 result; | 258 Atomic64 result; |
278 int32_t temp; | 259 int32_t temp; |
279 | 260 |
280 __asm__ __volatile__ ( // NOLINT | 261 __asm__ __volatile__ ( // NOLINT |
281 "0: \n\t" | 262 "0: \n\t" |
282 "ldxr %[result], [%[ptr]] \n\t" | 263 "ldxr %[result], %[ptr] \n\t" |
283 "add %[result], %[result], %[increment] \n\t" | 264 "add %[result], %[result], %[increment] \n\t" |
284 "stxr %w[temp], %[result], [%[ptr]] \n\t" | 265 "stxr %w[temp], %[result], %[ptr] \n\t" |
285 "cbnz %w[temp], 0b \n\t" | 266 "cbnz %w[temp], 0b \n\t" |
286 : [result]"=&r" (result), | 267 : [result]"=&r" (result), |
287 [temp]"=&r" (temp) | 268 [temp]"=&r" (temp), |
288 : [ptr]"r" (ptr), | 269 [ptr]"+Q" (*ptr) |
289 [increment]"r" (increment) | 270 : [increment]"r" (increment) |
290 : "memory" | 271 : "memory" |
291 ); // NOLINT | 272 ); // NOLINT |
292 | 273 |
293 return result; | 274 return result; |
294 } | 275 } |
295 | 276 |
296 inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, | 277 inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, |
297 Atomic64 increment) { | 278 Atomic64 increment) { |
298 Atomic64 result; | 279 MemoryBarrier(); |
299 int32_t temp; | 280 Atomic64 result = NoBarrier_AtomicIncrement(ptr, increment); |
300 | 281 MemoryBarrier(); |
301 __asm__ __volatile__ ( // NOLINT | |
302 "dmb ish \n\t" | |
303 "0: \n\t" | |
304 "ldxr %[result], [%[ptr]] \n\t" | |
305 "add %[result], %[result], %[increment] \n\t" | |
306 "stxr %w[temp], %[result], [%[ptr]] \n\t" | |
307 "cbnz %w[temp], 0b \n\t" | |
308 "dmb ish \n\t" | |
309 : [result]"=&r" (result), | |
310 [temp]"=&r" (temp) | |
311 : [ptr]"r" (ptr), | |
312 [increment]"r" (increment) | |
313 : "memory" | |
314 ); // NOLINT | |
315 | 282 |
316 return result; | 283 return result; |
317 } | 284 } |
318 | 285 |
319 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr, | 286 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr, |
320 Atomic64 old_value, | 287 Atomic64 old_value, |
321 Atomic64 new_value) { | 288 Atomic64 new_value) { |
322 Atomic64 prev; | 289 Atomic64 prev; |
323 int32_t temp; | 290 int32_t temp; |
324 | 291 |
325 __asm__ __volatile__ ( // NOLINT | 292 __asm__ __volatile__ ( // NOLINT |
326 "0: \n\t" | 293 "0: \n\t" |
327 "ldxr %[prev], [%[ptr]] \n\t" | 294 "ldxr %[prev], %[ptr] \n\t" |
328 "cmp %[prev], %[old_value] \n\t" | 295 "cmp %[prev], %[old_value] \n\t" |
329 "bne 1f \n\t" | 296 "bne 1f \n\t" |
330 "stxr %w[temp], %[new_value], [%[ptr]] \n\t" | 297 "stxr %w[temp], %[new_value], %[ptr] \n\t" |
331 "cbnz %w[temp], 0b \n\t" | 298 "cbnz %w[temp], 0b \n\t" |
332 "dmb ish \n\t" | 299 "dmb ish \n\t" |
333 "1: \n\t" | 300 "1: \n\t" |
334 "clrex \n\t" | 301 "clrex \n\t" |
335 : [prev]"=&r" (prev), | 302 : [prev]"=&r" (prev), |
336 [temp]"=&r" (temp) | 303 [temp]"=&r" (temp), |
337 : [ptr]"r" (ptr), | 304 [ptr]"+Q" (*ptr) |
338 [old_value]"r" (old_value), | 305 : [old_value]"r" (old_value), |
339 [new_value]"r" (new_value) | 306 [new_value]"r" (new_value) |
340 : "memory", "cc" | 307 : "memory", "cc" |
341 ); // NOLINT | 308 ); // NOLINT |
342 | 309 |
343 return prev; | 310 return prev; |
344 } | 311 } |
345 | 312 |
346 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr, | 313 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr, |
347 Atomic64 old_value, | 314 Atomic64 old_value, |
348 Atomic64 new_value) { | 315 Atomic64 new_value) { |
349 Atomic64 prev; | 316 Atomic64 prev; |
350 int32_t temp; | 317 int32_t temp; |
351 | 318 |
| 319 MemoryBarrier(); |
| 320 |
352 __asm__ __volatile__ ( // NOLINT | 321 __asm__ __volatile__ ( // NOLINT |
353 "dmb ish \n\t" | |
354 "0: \n\t" | 322 "0: \n\t" |
355 "ldxr %[prev], [%[ptr]] \n\t" | 323 "ldxr %[prev], %[ptr] \n\t" |
356 "cmp %[prev], %[old_value] \n\t" | 324 "cmp %[prev], %[old_value] \n\t" |
357 "bne 1f \n\t" | 325 "bne 1f \n\t" |
358 "stxr %w[temp], %[new_value], [%[ptr]] \n\t" | 326 "stxr %w[temp], %[new_value], %[ptr] \n\t" |
359 "cbnz %w[temp], 0b \n\t" | 327 "cbnz %w[temp], 0b \n\t" |
360 "1: \n\t" | 328 "1: \n\t" |
361 "clrex \n\t" | 329 "clrex \n\t" |
362 : [prev]"=&r" (prev), | 330 : [prev]"=&r" (prev), |
363 [temp]"=&r" (temp) | 331 [temp]"=&r" (temp), |
364 : [ptr]"r" (ptr), | 332 [ptr]"+Q" (*ptr) |
365 [old_value]"r" (old_value), | 333 : [old_value]"r" (old_value), |
366 [new_value]"r" (new_value) | 334 [new_value]"r" (new_value) |
367 : "memory", "cc" | 335 : "memory", "cc" |
368 ); // NOLINT | 336 ); // NOLINT |
369 | 337 |
370 return prev; | 338 return prev; |
371 } | 339 } |
372 | 340 |
373 inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) { | 341 inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) { |
374 *ptr = value; | 342 *ptr = value; |
375 } | 343 } |
376 | 344 |
377 inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) { | 345 inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) { |
378 *ptr = value; | 346 *ptr = value; |
379 __asm__ __volatile__ ( // NOLINT | 347 MemoryBarrier(); |
380 "dmb ish \n\t" | |
381 ::: "memory" | |
382 ); // NOLINT | |
383 } | 348 } |
384 | 349 |
385 inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) { | 350 inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) { |
386 __asm__ __volatile__ ( // NOLINT | 351 MemoryBarrier(); |
387 "dmb ish \n\t" | |
388 ::: "memory" | |
389 ); // NOLINT | |
390 *ptr = value; | 352 *ptr = value; |
391 } | 353 } |
392 | 354 |
393 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) { | 355 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) { |
394 return *ptr; | 356 return *ptr; |
395 } | 357 } |
396 | 358 |
397 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) { | 359 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) { |
398 Atomic64 value = *ptr; | 360 Atomic64 value = *ptr; |
399 __asm__ __volatile__ ( // NOLINT | 361 MemoryBarrier(); |
400 "dmb ish \n\t" | |
401 ::: "memory" | |
402 ); // NOLINT | |
403 return value; | 362 return value; |
404 } | 363 } |
405 | 364 |
406 inline Atomic64 Release_Load(volatile const Atomic64* ptr) { | 365 inline Atomic64 Release_Load(volatile const Atomic64* ptr) { |
407 __asm__ __volatile__ ( // NOLINT | 366 MemoryBarrier(); |
408 "dmb ish \n\t" | |
409 ::: "memory" | |
410 ); // NOLINT | |
411 return *ptr; | 367 return *ptr; |
412 } | 368 } |
413 | 369 |
414 } } // namespace v8::internal | 370 } } // namespace v8::internal |
415 | 371 |
416 #endif // V8_ATOMICOPS_INTERNALS_ARM_GCC_H_ | 372 #endif // V8_ATOMICOPS_INTERNALS_ARM_GCC_H_ |
OLD | NEW |