1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2011, 2015, Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
147 }
148
149 /* Atomically write VALUE into `*PTR' and returns the previous
150 contents of `*PTR'. */
151 static inline int arm_lock_test_and_set(int newval, volatile int *ptr) {
152 for (;;) {
153 // Loop until a __kernel_cmpxchg succeeds.
154 int prev = *ptr;
155
156 if (__kernel_cmpxchg (prev, newval, ptr) == 0)
157 return prev;
158 }
159 }
160 #endif // ARM
161
162 template<size_t byte_size>
163 struct Atomic::PlatformAdd
164 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
165 {
166 template<typename I, typename D>
167 D add_and_fetch(I add_value, D volatile* dest) const;
168 };
169
170 template<>
171 template<typename I, typename D>
172 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest) const {
173 STATIC_ASSERT(4 == sizeof(I));
174 STATIC_ASSERT(4 == sizeof(D));
175
176 #ifdef ARM
177 return add_using_helper<int>(arm_add_and_fetch, add_value, dest);
178 #else
179 #ifdef M68K
180 return add_using_helper<int>(m68k_add_and_fetch, add_value, dest);
181 #else
182 return __sync_add_and_fetch(dest, add_value);
183 #endif // M68K
184 #endif // ARM
185 }
186
187 template<>
188 template<typename I, typename D>
189 inline D Atomic::PlatformAdd<8>::add_and_fetch(I add_value, D volatile* dest) const {
190 STATIC_ASSERT(8 == sizeof(I));
191 STATIC_ASSERT(8 == sizeof(D));
192
193 return __sync_add_and_fetch(dest, add_value);
194 }
195
196 template<>
197 template<typename T>
198 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value,
199 T volatile* dest) const {
200 STATIC_ASSERT(4 == sizeof(T));
201 #ifdef ARM
202 return xchg_using_helper<int>(arm_lock_test_and_set, exchange_value, dest);
203 #else
204 #ifdef M68K
205 return xchg_using_helper<int>(m68k_lock_test_and_set, exchange_value, dest);
206 #else
207 // __sync_lock_test_and_set is a bizarrely named atomic exchange
208 // operation. Note that some platforms only support this with the
209 // limitation that the only valid value to store is the immediate
210 // constant 1. There is a test for this in JNI_CreateJavaVM().
211 T result = __sync_lock_test_and_set (dest, exchange_value);
212 // All atomic operations are expected to be full memory barriers
213 // (see atomic.hpp). However, __sync_lock_test_and_set is not
214 // a full memory barrier, but an acquire barrier. Hence, this added
215 // barrier.
216 __sync_synchronize();
217 return result;
218 #endif // M68K
219 #endif // ARM
220 }
221
222 template<>
223 template<typename T>
224 inline T Atomic::PlatformXchg<8>::operator()(T exchange_value,
225 T volatile* dest) const {
226 STATIC_ASSERT(8 == sizeof(T));
227 T result = __sync_lock_test_and_set (dest, exchange_value);
228 __sync_synchronize();
229 return result;
230 }
231
232 // No direct support for cmpxchg of bytes; emulate using int.
233 template<>
234 struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
235
236 template<>
237 template<typename T>
238 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
239 T volatile* dest,
240 T compare_value,
241 cmpxchg_memory_order order) const {
242 STATIC_ASSERT(4 == sizeof(T));
243 #ifdef ARM
244 return cmpxchg_using_helper<int>(arm_compare_and_swap, exchange_value, dest, compare_value);
245 #else
246 #ifdef M68K
247 return cmpxchg_using_helper<int>(m68k_compare_and_swap, exchange_value, dest, compare_value);
248 #else
249 return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
250 #endif // M68K
251 #endif // ARM
252 }
253
254 template<>
255 template<typename T>
256 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
257 T volatile* dest,
258 T compare_value,
259 cmpxchg_memory_order order) const {
260 STATIC_ASSERT(8 == sizeof(T));
261 return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
262 }
263
264 template<>
265 template<typename T>
266 inline T Atomic::PlatformLoad<8>::operator()(T const volatile* src) const {
267 STATIC_ASSERT(8 == sizeof(T));
268 volatile int64_t dest;
269 os::atomic_copy64(reinterpret_cast<const volatile int64_t*>(src), reinterpret_cast<volatile int64_t*>(&dest));
270 return PrimitiveConversions::cast<T>(dest);
271 }
272
273 template<>
274 template<typename T>
275 inline void Atomic::PlatformStore<8>::operator()(T store_value,
276 T volatile* dest) const {
277 STATIC_ASSERT(8 == sizeof(T));
278 os::atomic_copy64(reinterpret_cast<const volatile int64_t*>(&store_value), reinterpret_cast<volatile int64_t*>(dest));
279 }
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1 /*
2 * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2011, 2015, Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
147 }
148
149 /* Atomically write VALUE into `*PTR' and returns the previous
150 contents of `*PTR'. */
151 static inline int arm_lock_test_and_set(int newval, volatile int *ptr) {
152 for (;;) {
153 // Loop until a __kernel_cmpxchg succeeds.
154 int prev = *ptr;
155
156 if (__kernel_cmpxchg (prev, newval, ptr) == 0)
157 return prev;
158 }
159 }
160 #endif // ARM
161
162 template<size_t byte_size>
163 struct Atomic::PlatformAdd
164 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
165 {
166 template<typename I, typename D>
167 D add_and_fetch(I add_value, D volatile* dest, atomic_memory_order order) const;
168 };
169
170 template<>
171 template<typename I, typename D>
172 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest,
173 atomic_memory_order order) const {
174 STATIC_ASSERT(4 == sizeof(I));
175 STATIC_ASSERT(4 == sizeof(D));
176
177 #ifdef ARM
178 return add_using_helper<int>(arm_add_and_fetch, add_value, dest);
179 #else
180 #ifdef M68K
181 return add_using_helper<int>(m68k_add_and_fetch, add_value, dest);
182 #else
183 return __sync_add_and_fetch(dest, add_value);
184 #endif // M68K
185 #endif // ARM
186 }
187
188 template<>
189 template<typename I, typename D>
190 inline D Atomic::PlatformAdd<8>::add_and_fetch(I add_value, D volatile* dest,
191 atomic_memory_order order) const {
192 STATIC_ASSERT(8 == sizeof(I));
193 STATIC_ASSERT(8 == sizeof(D));
194
195 return __sync_add_and_fetch(dest, add_value);
196 }
197
198 template<>
199 template<typename T>
200 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value,
201 T volatile* dest,
202 atomic_memory_order order) const {
203 STATIC_ASSERT(4 == sizeof(T));
204 #ifdef ARM
205 return xchg_using_helper<int>(arm_lock_test_and_set, exchange_value, dest);
206 #else
207 #ifdef M68K
208 return xchg_using_helper<int>(m68k_lock_test_and_set, exchange_value, dest);
209 #else
210 // __sync_lock_test_and_set is a bizarrely named atomic exchange
211 // operation. Note that some platforms only support this with the
212 // limitation that the only valid value to store is the immediate
213 // constant 1. There is a test for this in JNI_CreateJavaVM().
214 T result = __sync_lock_test_and_set (dest, exchange_value);
215 // All atomic operations are expected to be full memory barriers
216 // (see atomic.hpp). However, __sync_lock_test_and_set is not
217 // a full memory barrier, but an acquire barrier. Hence, this added
218 // barrier.
219 __sync_synchronize();
220 return result;
221 #endif // M68K
222 #endif // ARM
223 }
224
225 template<>
226 template<typename T>
227 inline T Atomic::PlatformXchg<8>::operator()(T exchange_value,
228 T volatile* dest,
229 atomic_memory_order order) const {
230 STATIC_ASSERT(8 == sizeof(T));
231 T result = __sync_lock_test_and_set (dest, exchange_value);
232 __sync_synchronize();
233 return result;
234 }
235
236 // No direct support for cmpxchg of bytes; emulate using int.
237 template<>
238 struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
239
240 template<>
241 template<typename T>
242 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
243 T volatile* dest,
244 T compare_value,
245 atomic_memory_order order) const {
246 STATIC_ASSERT(4 == sizeof(T));
247 #ifdef ARM
248 return cmpxchg_using_helper<int>(arm_compare_and_swap, exchange_value, dest, compare_value);
249 #else
250 #ifdef M68K
251 return cmpxchg_using_helper<int>(m68k_compare_and_swap, exchange_value, dest, compare_value);
252 #else
253 return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
254 #endif // M68K
255 #endif // ARM
256 }
257
258 template<>
259 template<typename T>
260 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
261 T volatile* dest,
262 T compare_value,
263 atomic_memory_order order) const {
264 STATIC_ASSERT(8 == sizeof(T));
265 return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
266 }
267
268 template<>
269 template<typename T>
270 inline T Atomic::PlatformLoad<8>::operator()(T const volatile* src) const {
271 STATIC_ASSERT(8 == sizeof(T));
272 volatile int64_t dest;
273 os::atomic_copy64(reinterpret_cast<const volatile int64_t*>(src), reinterpret_cast<volatile int64_t*>(&dest));
274 return PrimitiveConversions::cast<T>(dest);
275 }
276
277 template<>
278 template<typename T>
279 inline void Atomic::PlatformStore<8>::operator()(T store_value,
280 T volatile* dest) const {
281 STATIC_ASSERT(8 == sizeof(T));
282 os::atomic_copy64(reinterpret_cast<const volatile int64_t*>(&store_value), reinterpret_cast<volatile int64_t*>(dest));
283 }
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