1 /* 2 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Implementation of class atomic 26 27 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; } 28 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; } 29 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; } 30 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; } 31 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; } 32 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; } 33 34 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; } 35 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; } 36 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; } 37 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; } 38 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; } 39 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; } 40 41 inline void Atomic::inc (volatile jint* dest) { (void)add (1, dest); } 42 inline void Atomic::inc_ptr(volatile intptr_t* dest) { (void)add_ptr(1, dest); } 43 inline void Atomic::inc_ptr(volatile void* dest) { (void)add_ptr(1, dest); } 44 45 inline void Atomic::dec (volatile jint* dest) { (void)add (-1, dest); } 46 inline void Atomic::dec_ptr(volatile intptr_t* dest) { (void)add_ptr(-1, dest); } 47 inline void Atomic::dec_ptr(volatile void* dest) { (void)add_ptr(-1, dest); } 48 49 inline jint Atomic::add (jint add_value, volatile jint* dest) { 50 intptr_t rv; 51 __asm__ volatile( 52 "1: \n\t" 53 " ld [%2], %%o2\n\t" 54 " add %1, %%o2, %%o3\n\t" 55 " cas [%2], %%o2, %%o3\n\t" 56 " cmp %%o2, %%o3\n\t" 57 " bne 1b\n\t" 58 " nop\n\t" 59 " add %1, %%o2, %0\n\t" 60 : "=r" (rv) 61 : "r" (add_value), "r" (dest) 62 : "memory", "o2", "o3"); 63 return rv; 64 } 65 66 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { 67 intptr_t rv; 68 #ifdef _LP64 69 __asm__ volatile( 70 "1: \n\t" 71 " ldx [%2], %%o2\n\t" 72 " add %0, %%o2, %%o3\n\t" 73 " casx [%2], %%o2, %%o3\n\t" 74 " cmp %%o2, %%o3\n\t" 75 " bne %%xcc, 1b\n\t" 76 " nop\n\t" 77 " add %0, %%o2, %0\n\t" 78 : "=r" (rv) 79 : "r" (add_value), "r" (dest) 80 : "memory", "o2", "o3"); 81 #else 82 __asm__ volatile( 83 "1: \n\t" 84 " ld [%2], %%o2\n\t" 85 " add %1, %%o2, %%o3\n\t" 86 " cas [%2], %%o2, %%o3\n\t" 87 " cmp %%o2, %%o3\n\t" 88 " bne 1b\n\t" 89 " nop\n\t" 90 " add %1, %%o2, %0\n\t" 91 : "=r" (rv) 92 : "r" (add_value), "r" (dest) 93 : "memory", "o2", "o3"); 94 #endif // _LP64 95 return rv; 96 } 97 98 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { 99 return (void*)add_ptr((intptr_t)add_value, (volatile intptr_t*)dest); 100 } 101 102 103 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) { 104 intptr_t rv = exchange_value; 105 __asm__ volatile( 106 " swap [%2],%1\n\t" 107 : "=r" (rv) 108 : "0" (exchange_value) /* we use same register as for return value */, "r" (dest) 109 : "memory"); 110 return rv; 111 } 112 113 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { 114 intptr_t rv = exchange_value; 115 #ifdef _LP64 116 __asm__ volatile( 117 "1:\n\t" 118 " mov %1, %%o3\n\t" 119 " ldx [%2], %%o2\n\t" 120 " casx [%2], %%o2, %%o3\n\t" 121 " cmp %%o2, %%o3\n\t" 122 " bne %%xcc, 1b\n\t" 123 " nop\n\t" 124 " mov %%o2, %0\n\t" 125 : "=r" (rv) 126 : "r" (exchange_value), "r" (dest) 127 : "memory", "o2", "o3"); 128 #else 129 __asm__ volatile( 130 "swap [%2],%1\n\t" 131 : "=r" (rv) 132 : "0" (exchange_value) /* we use same register as for return value */, "r" (dest) 133 : "memory"); 134 #endif // _LP64 135 return rv; 136 } 137 138 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { 139 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest); 140 } 141 142 143 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) { 144 jint rv; 145 __asm__ volatile( 146 " cas [%2], %3, %0" 147 : "=r" (rv) 148 : "0" (exchange_value), "r" (dest), "r" (compare_value) 149 : "memory"); 150 return rv; 151 } 152 153 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) { 154 #ifdef _LP64 155 jlong rv; 156 __asm__ volatile( 157 " casx [%2], %3, %0" 158 : "=r" (rv) 159 : "0" (exchange_value), "r" (dest), "r" (compare_value) 160 : "memory"); 161 return rv; 162 #else 163 assert(VM_Version::v9_instructions_work(), "cas only supported on v9"); 164 volatile jlong_accessor evl, cvl, rv; 165 evl.long_value = exchange_value; 166 cvl.long_value = compare_value; 167 168 __asm__ volatile( 169 " sllx %2, 32, %2\n\t" 170 " srl %3, 0, %3\n\t" 171 " or %2, %3, %2\n\t" 172 " sllx %5, 32, %5\n\t" 173 " srl %6, 0, %6\n\t" 174 " or %5, %6, %5\n\t" 175 " casx [%4], %5, %2\n\t" 176 " srl %2, 0, %1\n\t" 177 " srlx %2, 32, %0\n\t" 178 : "=r" (rv.words[0]), "=r" (rv.words[1]) 179 : "r" (evl.words[0]), "r" (evl.words[1]), "r" (dest), "r" (cvl.words[0]), "r" (cvl.words[1]) 180 : "memory"); 181 182 return rv.long_value; 183 #endif 184 } 185 186 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) { 187 intptr_t rv; 188 #ifdef _LP64 189 __asm__ volatile( 190 " casx [%2], %3, %0" 191 : "=r" (rv) 192 : "0" (exchange_value), "r" (dest), "r" (compare_value) 193 : "memory"); 194 #else 195 __asm__ volatile( 196 " cas [%2], %3, %0" 197 : "=r" (rv) 198 : "0" (exchange_value), "r" (dest), "r" (compare_value) 199 : "memory"); 200 #endif // _LP64 201 return rv; 202 } 203 204 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) { 205 return (void*)cmpxchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest, (intptr_t)compare_value); 206 }