Mercurial > hg > graal-compiler
annotate src/os_cpu/linux_zero/vm/atomic_linux_zero.inline.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 354d3184f6b2 |
| children | f95d63e2154a |
| rev | line source |
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| 1010 | 1 /* |
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2 * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved. |
| 1010 | 3 * Copyright 2007, 2008 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 * | |
|
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
| 1010 | 23 * |
| 24 */ | |
| 25 | |
| 26 // Implementation of class atomic | |
| 27 | |
| 28 #ifdef M68K | |
| 29 | |
| 30 /* | |
| 31 * __m68k_cmpxchg | |
| 32 * | |
| 33 * Atomically store newval in *ptr if *ptr is equal to oldval for user space. | |
| 34 * Returns newval on success and oldval if no exchange happened. | |
| 35 * This implementation is processor specific and works on | |
| 36 * 68020 68030 68040 and 68060. | |
| 37 * | |
| 38 * It will not work on ColdFire, 68000 and 68010 since they lack the CAS | |
| 39 * instruction. | |
| 40 * Using a kernelhelper would be better for arch complete implementation. | |
| 41 * | |
| 42 */ | |
| 43 | |
| 44 static inline int __m68k_cmpxchg(int oldval, int newval, volatile int *ptr) { | |
| 45 int ret; | |
| 46 __asm __volatile ("cas%.l %0,%2,%1" | |
| 47 : "=d" (ret), "+m" (*(ptr)) | |
| 48 : "d" (newval), "0" (oldval)); | |
| 49 return ret; | |
| 50 } | |
| 51 | |
| 52 /* Perform an atomic compare and swap: if the current value of `*PTR' | |
| 53 is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of | |
| 54 `*PTR' before the operation.*/ | |
| 55 static inline int m68k_compare_and_swap(volatile int *ptr, | |
| 56 int oldval, | |
| 57 int newval) { | |
| 58 for (;;) { | |
| 59 int prev = *ptr; | |
| 60 if (prev != oldval) | |
| 61 return prev; | |
| 62 | |
| 63 if (__m68k_cmpxchg (prev, newval, ptr) == newval) | |
| 64 // Success. | |
| 65 return prev; | |
| 66 | |
| 67 // We failed even though prev == oldval. Try again. | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 /* Atomically add an int to memory. */ | |
| 72 static inline int m68k_add_and_fetch(volatile int *ptr, int add_value) { | |
| 73 for (;;) { | |
| 74 // Loop until success. | |
| 75 | |
| 76 int prev = *ptr; | |
| 77 | |
| 78 if (__m68k_cmpxchg (prev, prev + add_value, ptr) == prev + add_value) | |
| 79 return prev + add_value; | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 /* Atomically write VALUE into `*PTR' and returns the previous | |
| 84 contents of `*PTR'. */ | |
| 85 static inline int m68k_lock_test_and_set(volatile int *ptr, int newval) { | |
| 86 for (;;) { | |
| 87 // Loop until success. | |
| 88 int prev = *ptr; | |
| 89 | |
| 90 if (__m68k_cmpxchg (prev, newval, ptr) == prev) | |
| 91 return prev; | |
| 92 } | |
| 93 } | |
| 94 #endif // M68K | |
| 95 | |
| 96 #ifdef ARM | |
| 97 | |
| 98 /* | |
| 99 * __kernel_cmpxchg | |
| 100 * | |
| 101 * Atomically store newval in *ptr if *ptr is equal to oldval for user space. | |
| 102 * Return zero if *ptr was changed or non-zero if no exchange happened. | |
| 103 * The C flag is also set if *ptr was changed to allow for assembly | |
| 104 * optimization in the calling code. | |
| 105 * | |
| 106 */ | |
| 107 | |
| 108 typedef int (__kernel_cmpxchg_t)(int oldval, int newval, volatile int *ptr); | |
| 109 #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *) 0xffff0fc0) | |
| 110 | |
| 111 | |
| 112 | |
| 113 /* Perform an atomic compare and swap: if the current value of `*PTR' | |
| 114 is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of | |
| 115 `*PTR' before the operation.*/ | |
| 116 static inline int arm_compare_and_swap(volatile int *ptr, | |
| 117 int oldval, | |
| 118 int newval) { | |
| 119 for (;;) { | |
| 120 int prev = *ptr; | |
| 121 if (prev != oldval) | |
| 122 return prev; | |
| 123 | |
| 124 if (__kernel_cmpxchg (prev, newval, ptr) == 0) | |
| 125 // Success. | |
| 126 return prev; | |
| 127 | |
| 128 // We failed even though prev == oldval. Try again. | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 /* Atomically add an int to memory. */ | |
| 133 static inline int arm_add_and_fetch(volatile int *ptr, int add_value) { | |
| 134 for (;;) { | |
| 135 // Loop until a __kernel_cmpxchg succeeds. | |
| 136 | |
| 137 int prev = *ptr; | |
| 138 | |
| 139 if (__kernel_cmpxchg (prev, prev + add_value, ptr) == 0) | |
| 140 return prev + add_value; | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 /* Atomically write VALUE into `*PTR' and returns the previous | |
| 145 contents of `*PTR'. */ | |
| 146 static inline int arm_lock_test_and_set(volatile int *ptr, int newval) { | |
| 147 for (;;) { | |
| 148 // Loop until a __kernel_cmpxchg succeeds. | |
| 149 int prev = *ptr; | |
| 150 | |
| 151 if (__kernel_cmpxchg (prev, newval, ptr) == 0) | |
| 152 return prev; | |
| 153 } | |
| 154 } | |
| 155 #endif // ARM | |
| 156 | |
| 157 inline void Atomic::store(jint store_value, volatile jint* dest) { | |
| 158 *dest = store_value; | |
| 159 } | |
| 160 | |
| 161 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { | |
| 162 *dest = store_value; | |
| 163 } | |
| 164 | |
| 165 inline jint Atomic::add(jint add_value, volatile jint* dest) { | |
| 166 #ifdef ARM | |
| 167 return arm_add_and_fetch(dest, add_value); | |
| 168 #else | |
| 169 #ifdef M68K | |
| 170 return m68k_add_and_fetch(dest, add_value); | |
| 171 #else | |
| 172 return __sync_add_and_fetch(dest, add_value); | |
| 173 #endif // M68K | |
| 174 #endif // ARM | |
| 175 } | |
| 176 | |
| 177 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { | |
| 178 #ifdef ARM | |
| 179 return arm_add_and_fetch(dest, add_value); | |
| 180 #else | |
| 181 #ifdef M68K | |
| 182 return m68k_add_and_fetch(dest, add_value); | |
| 183 #else | |
| 184 return __sync_add_and_fetch(dest, add_value); | |
| 185 #endif // M68K | |
| 186 #endif // ARM | |
| 187 } | |
| 188 | |
| 189 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { | |
| 190 return (void *) add_ptr(add_value, (volatile intptr_t *) dest); | |
| 191 } | |
| 192 | |
| 193 inline void Atomic::inc(volatile jint* dest) { | |
| 194 add(1, dest); | |
| 195 } | |
| 196 | |
| 197 inline void Atomic::inc_ptr(volatile intptr_t* dest) { | |
| 198 add_ptr(1, dest); | |
| 199 } | |
| 200 | |
| 201 inline void Atomic::inc_ptr(volatile void* dest) { | |
| 202 add_ptr(1, dest); | |
| 203 } | |
| 204 | |
| 205 inline void Atomic::dec(volatile jint* dest) { | |
| 206 add(-1, dest); | |
| 207 } | |
| 208 | |
| 209 inline void Atomic::dec_ptr(volatile intptr_t* dest) { | |
| 210 add_ptr(-1, dest); | |
| 211 } | |
| 212 | |
| 213 inline void Atomic::dec_ptr(volatile void* dest) { | |
| 214 add_ptr(-1, dest); | |
| 215 } | |
| 216 | |
| 217 inline jint Atomic::xchg(jint exchange_value, volatile jint* dest) { | |
| 218 #ifdef ARM | |
| 219 return arm_lock_test_and_set(dest, exchange_value); | |
| 220 #else | |
| 221 #ifdef M68K | |
| 222 return m68k_lock_test_and_set(dest, exchange_value); | |
| 223 #else | |
| 224 // __sync_lock_test_and_set is a bizarrely named atomic exchange | |
| 225 // operation. Note that some platforms only support this with the | |
| 226 // limitation that the only valid value to store is the immediate | |
| 227 // constant 1. There is a test for this in JNI_CreateJavaVM(). | |
| 228 return __sync_lock_test_and_set (dest, exchange_value); | |
| 229 #endif // M68K | |
| 230 #endif // ARM | |
| 231 } | |
| 232 | |
| 233 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, | |
| 234 volatile intptr_t* dest) { | |
| 235 #ifdef ARM | |
| 236 return arm_lock_test_and_set(dest, exchange_value); | |
| 237 #else | |
| 238 #ifdef M68K | |
| 239 return m68k_lock_test_and_set(dest, exchange_value); | |
| 240 #else | |
| 241 return __sync_lock_test_and_set (dest, exchange_value); | |
| 242 #endif // M68K | |
| 243 #endif // ARM | |
| 244 } | |
| 245 | |
| 246 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { | |
| 247 return (void *) xchg_ptr((intptr_t) exchange_value, | |
| 248 (volatile intptr_t*) dest); | |
| 249 } | |
| 250 | |
| 251 inline jint Atomic::cmpxchg(jint exchange_value, | |
| 252 volatile jint* dest, | |
| 253 jint compare_value) { | |
| 254 #ifdef ARM | |
| 255 return arm_compare_and_swap(dest, compare_value, exchange_value); | |
| 256 #else | |
| 257 #ifdef M68K | |
| 258 return m68k_compare_and_swap(dest, compare_value, exchange_value); | |
| 259 #else | |
| 260 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); | |
| 261 #endif // M68K | |
| 262 #endif // ARM | |
| 263 } | |
| 264 | |
| 265 inline jlong Atomic::cmpxchg(jlong exchange_value, | |
| 266 volatile jlong* dest, | |
| 267 jlong compare_value) { | |
| 268 | |
| 269 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); | |
| 270 } | |
| 271 | |
| 272 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, | |
| 273 volatile intptr_t* dest, | |
| 274 intptr_t compare_value) { | |
| 275 #ifdef ARM | |
| 276 return arm_compare_and_swap(dest, compare_value, exchange_value); | |
| 277 #else | |
| 278 #ifdef M68K | |
| 279 return m68k_compare_and_swap(dest, compare_value, exchange_value); | |
| 280 #else | |
| 281 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); | |
| 282 #endif // M68K | |
| 283 #endif // ARM | |
| 284 } | |
| 285 | |
| 286 inline void* Atomic::cmpxchg_ptr(void* exchange_value, | |
| 287 volatile void* dest, | |
| 288 void* compare_value) { | |
| 289 | |
| 290 return (void *) cmpxchg_ptr((intptr_t) exchange_value, | |
| 291 (volatile intptr_t*) dest, | |
| 292 (intptr_t) compare_value); | |
| 293 } |