Mercurial > hg > truffle
annotate src/os_cpu/bsd_zero/vm/atomic_bsd_zero.inline.hpp @ 19344:83b35b97959c
Merge with f7b121b82697c3c3adcce9f9ea3fcc241c2eb968
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
---|---|
date | Thu, 12 Feb 2015 16:57:30 -0800 |
parents | 63e54c37ac64 |
children |
rev | line source |
---|---|
3960 | 1 /* |
8675
63e54c37ac64
8008959: Fix non-PCH build on Linux, Windows and MacOS X
simonis
parents:
3960
diff
changeset
|
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 3 * Copyright 2007, 2008, 2011 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. | |
23 * | |
24 */ | |
25 | |
26 #ifndef OS_CPU_BSD_ZERO_VM_ATOMIC_BSD_ZERO_INLINE_HPP | |
27 #define OS_CPU_BSD_ZERO_VM_ATOMIC_BSD_ZERO_INLINE_HPP | |
28 | |
29 #include "runtime/atomic.hpp" | |
30 #include "runtime/os.hpp" | |
31 #include "vm_version_zero.hpp" | |
32 | |
33 // Implementation of class atomic | |
34 | |
35 #ifdef M68K | |
36 | |
37 /* | |
38 * __m68k_cmpxchg | |
39 * | |
40 * Atomically store newval in *ptr if *ptr is equal to oldval for user space. | |
41 * Returns newval on success and oldval if no exchange happened. | |
42 * This implementation is processor specific and works on | |
43 * 68020 68030 68040 and 68060. | |
44 * | |
45 * It will not work on ColdFire, 68000 and 68010 since they lack the CAS | |
46 * instruction. | |
47 * Using a kernelhelper would be better for arch complete implementation. | |
48 * | |
49 */ | |
50 | |
51 static inline int __m68k_cmpxchg(int oldval, int newval, volatile int *ptr) { | |
52 int ret; | |
53 __asm __volatile ("cas%.l %0,%2,%1" | |
54 : "=d" (ret), "+m" (*(ptr)) | |
55 : "d" (newval), "0" (oldval)); | |
56 return ret; | |
57 } | |
58 | |
59 /* Perform an atomic compare and swap: if the current value of `*PTR' | |
60 is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of | |
61 `*PTR' before the operation.*/ | |
62 static inline int m68k_compare_and_swap(volatile int *ptr, | |
63 int oldval, | |
64 int newval) { | |
65 for (;;) { | |
66 int prev = *ptr; | |
67 if (prev != oldval) | |
68 return prev; | |
69 | |
70 if (__m68k_cmpxchg (prev, newval, ptr) == newval) | |
71 // Success. | |
72 return prev; | |
73 | |
74 // We failed even though prev == oldval. Try again. | |
75 } | |
76 } | |
77 | |
78 /* Atomically add an int to memory. */ | |
79 static inline int m68k_add_and_fetch(volatile int *ptr, int add_value) { | |
80 for (;;) { | |
81 // Loop until success. | |
82 | |
83 int prev = *ptr; | |
84 | |
85 if (__m68k_cmpxchg (prev, prev + add_value, ptr) == prev + add_value) | |
86 return prev + add_value; | |
87 } | |
88 } | |
89 | |
90 /* Atomically write VALUE into `*PTR' and returns the previous | |
91 contents of `*PTR'. */ | |
92 static inline int m68k_lock_test_and_set(volatile int *ptr, int newval) { | |
93 for (;;) { | |
94 // Loop until success. | |
95 int prev = *ptr; | |
96 | |
97 if (__m68k_cmpxchg (prev, newval, ptr) == prev) | |
98 return prev; | |
99 } | |
100 } | |
101 #endif // M68K | |
102 | |
103 #ifdef ARM | |
104 | |
105 /* | |
106 * __kernel_cmpxchg | |
107 * | |
108 * Atomically store newval in *ptr if *ptr is equal to oldval for user space. | |
109 * Return zero if *ptr was changed or non-zero if no exchange happened. | |
110 * The C flag is also set if *ptr was changed to allow for assembly | |
111 * optimization in the calling code. | |
112 * | |
113 */ | |
114 | |
115 typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr); | |
116 #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *) 0xffff0fc0) | |
117 | |
118 | |
119 | |
120 /* Perform an atomic compare and swap: if the current value of `*PTR' | |
121 is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of | |
122 `*PTR' before the operation.*/ | |
123 static inline int arm_compare_and_swap(volatile int *ptr, | |
124 int oldval, | |
125 int newval) { | |
126 for (;;) { | |
127 int prev = *ptr; | |
128 if (prev != oldval) | |
129 return prev; | |
130 | |
131 if (__kernel_cmpxchg (prev, newval, ptr) == 0) | |
132 // Success. | |
133 return prev; | |
134 | |
135 // We failed even though prev == oldval. Try again. | |
136 } | |
137 } | |
138 | |
139 /* Atomically add an int to memory. */ | |
140 static inline int arm_add_and_fetch(volatile int *ptr, int add_value) { | |
141 for (;;) { | |
142 // Loop until a __kernel_cmpxchg succeeds. | |
143 | |
144 int prev = *ptr; | |
145 | |
146 if (__kernel_cmpxchg (prev, prev + add_value, ptr) == 0) | |
147 return prev + add_value; | |
148 } | |
149 } | |
150 | |
151 /* Atomically write VALUE into `*PTR' and returns the previous | |
152 contents of `*PTR'. */ | |
153 static inline int arm_lock_test_and_set(volatile int *ptr, int newval) { | |
154 for (;;) { | |
155 // Loop until a __kernel_cmpxchg succeeds. | |
156 int prev = *ptr; | |
157 | |
158 if (__kernel_cmpxchg (prev, newval, ptr) == 0) | |
159 return prev; | |
160 } | |
161 } | |
162 #endif // ARM | |
163 | |
164 inline void Atomic::store(jint store_value, volatile jint* dest) { | |
165 #if !defined(ARM) && !defined(M68K) | |
166 __sync_synchronize(); | |
167 #endif | |
168 *dest = store_value; | |
169 } | |
170 | |
171 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { | |
172 #if !defined(ARM) && !defined(M68K) | |
173 __sync_synchronize(); | |
174 #endif | |
175 *dest = store_value; | |
176 } | |
177 | |
178 inline jint Atomic::add(jint add_value, volatile jint* dest) { | |
179 #ifdef ARM | |
180 return arm_add_and_fetch(dest, add_value); | |
181 #else | |
182 #ifdef M68K | |
183 return m68k_add_and_fetch(dest, add_value); | |
184 #else | |
185 return __sync_add_and_fetch(dest, add_value); | |
186 #endif // M68K | |
187 #endif // ARM | |
188 } | |
189 | |
190 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { | |
191 #ifdef ARM | |
192 return arm_add_and_fetch(dest, add_value); | |
193 #else | |
194 #ifdef M68K | |
195 return m68k_add_and_fetch(dest, add_value); | |
196 #else | |
197 return __sync_add_and_fetch(dest, add_value); | |
198 #endif // M68K | |
199 #endif // ARM | |
200 } | |
201 | |
202 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { | |
203 return (void *) add_ptr(add_value, (volatile intptr_t *) dest); | |
204 } | |
205 | |
206 inline void Atomic::inc(volatile jint* dest) { | |
207 add(1, dest); | |
208 } | |
209 | |
210 inline void Atomic::inc_ptr(volatile intptr_t* dest) { | |
211 add_ptr(1, dest); | |
212 } | |
213 | |
214 inline void Atomic::inc_ptr(volatile void* dest) { | |
215 add_ptr(1, dest); | |
216 } | |
217 | |
218 inline void Atomic::dec(volatile jint* dest) { | |
219 add(-1, dest); | |
220 } | |
221 | |
222 inline void Atomic::dec_ptr(volatile intptr_t* dest) { | |
223 add_ptr(-1, dest); | |
224 } | |
225 | |
226 inline void Atomic::dec_ptr(volatile void* dest) { | |
227 add_ptr(-1, dest); | |
228 } | |
229 | |
230 inline jint Atomic::xchg(jint exchange_value, volatile jint* dest) { | |
231 #ifdef ARM | |
232 return arm_lock_test_and_set(dest, exchange_value); | |
233 #else | |
234 #ifdef M68K | |
235 return m68k_lock_test_and_set(dest, exchange_value); | |
236 #else | |
237 // __sync_lock_test_and_set is a bizarrely named atomic exchange | |
238 // operation. Note that some platforms only support this with the | |
239 // limitation that the only valid value to store is the immediate | |
240 // constant 1. There is a test for this in JNI_CreateJavaVM(). | |
241 return __sync_lock_test_and_set (dest, exchange_value); | |
242 #endif // M68K | |
243 #endif // ARM | |
244 } | |
245 | |
246 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, | |
247 volatile intptr_t* dest) { | |
248 #ifdef ARM | |
249 return arm_lock_test_and_set(dest, exchange_value); | |
250 #else | |
251 #ifdef M68K | |
252 return m68k_lock_test_and_set(dest, exchange_value); | |
253 #else | |
254 return __sync_lock_test_and_set (dest, exchange_value); | |
255 #endif // M68K | |
256 #endif // ARM | |
257 } | |
258 | |
259 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { | |
260 return (void *) xchg_ptr((intptr_t) exchange_value, | |
261 (volatile intptr_t*) dest); | |
262 } | |
263 | |
264 inline jint Atomic::cmpxchg(jint exchange_value, | |
265 volatile jint* dest, | |
266 jint compare_value) { | |
267 #ifdef ARM | |
268 return arm_compare_and_swap(dest, compare_value, exchange_value); | |
269 #else | |
270 #ifdef M68K | |
271 return m68k_compare_and_swap(dest, compare_value, exchange_value); | |
272 #else | |
273 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); | |
274 #endif // M68K | |
275 #endif // ARM | |
276 } | |
277 | |
278 inline jlong Atomic::cmpxchg(jlong exchange_value, | |
279 volatile jlong* dest, | |
280 jlong compare_value) { | |
281 | |
282 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); | |
283 } | |
284 | |
285 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, | |
286 volatile intptr_t* dest, | |
287 intptr_t compare_value) { | |
288 #ifdef ARM | |
289 return arm_compare_and_swap(dest, compare_value, exchange_value); | |
290 #else | |
291 #ifdef M68K | |
292 return m68k_compare_and_swap(dest, compare_value, exchange_value); | |
293 #else | |
294 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); | |
295 #endif // M68K | |
296 #endif // ARM | |
297 } | |
298 | |
299 inline void* Atomic::cmpxchg_ptr(void* exchange_value, | |
300 volatile void* dest, | |
301 void* compare_value) { | |
302 | |
303 return (void *) cmpxchg_ptr((intptr_t) exchange_value, | |
304 (volatile intptr_t*) dest, | |
305 (intptr_t) compare_value); | |
306 } | |
307 | |
308 inline jlong Atomic::load(volatile jlong* src) { | |
309 volatile jlong dest; | |
310 os::atomic_copy64(src, &dest); | |
311 return dest; | |
312 } | |
313 | |
314 inline void Atomic::store(jlong store_value, jlong* dest) { | |
315 os::atomic_copy64((volatile jlong*)&store_value, (volatile jlong*)dest); | |
316 } | |
317 | |
318 inline void Atomic::store(jlong store_value, volatile jlong* dest) { | |
319 os::atomic_copy64((volatile jlong*)&store_value, dest); | |
320 } | |
321 | |
322 #endif // OS_CPU_BSD_ZERO_VM_ATOMIC_BSD_ZERO_INLINE_HPP |