1 /* 2 * Copyright (c) 1999, 2017, 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 #ifndef OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP 26 #define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP 27 28 // Implementation of class atomic 29 30 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; } 31 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; } 32 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; } 33 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; } 34 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; } 35 36 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; } 37 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; } 38 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; } 39 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; } 40 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; } 41 42 43 inline jint Atomic::add (jint add_value, volatile jint* dest) { 44 jint addend = add_value; 45 __asm__ volatile ( "lock xaddl %0,(%2)" 46 : "=r" (addend) 47 : "0" (addend), "r" (dest) 48 : "cc", "memory"); 49 return addend + add_value; 50 } 51 52 inline void Atomic::inc (volatile jint* dest) { 53 __asm__ volatile ( "lock addl $1,(%0)" : 54 : "r" (dest) : "cc", "memory"); 55 } 56 57 inline void Atomic::inc_ptr(volatile void* dest) { 58 inc_ptr((volatile intptr_t*)dest); 59 } 60 61 inline void Atomic::dec (volatile jint* dest) { 62 __asm__ volatile ( "lock subl $1,(%0)" : 63 : "r" (dest) : "cc", "memory"); 64 } 65 66 inline void Atomic::dec_ptr(volatile void* dest) { 67 dec_ptr((volatile intptr_t*)dest); 68 } 69 70 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) { 71 __asm__ volatile ( "xchgl (%2),%0" 72 : "=r" (exchange_value) 73 : "0" (exchange_value), "r" (dest) 74 : "memory"); 75 return exchange_value; 76 } 77 78 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { 79 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest); 80 } 81 82 template<> 83 template<typename T> 84 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value, 85 T volatile* dest, 86 T compare_value, 87 cmpxchg_memory_order /* order */) const { 88 STATIC_ASSERT(1 == sizeof(T)); 89 __asm__ volatile ("lock cmpxchgb %1,(%3)" 90 : "=a" (exchange_value) 91 : "q" (exchange_value), "a" (compare_value), "r" (dest) 92 : "cc", "memory"); 93 return exchange_value; 94 } 95 96 template<> 97 template<typename T> 98 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value, 99 T volatile* dest, 100 T compare_value, 101 cmpxchg_memory_order /* order */) const { 102 STATIC_ASSERT(4 == sizeof(T)); 103 __asm__ volatile ("lock cmpxchgl %1,(%3)" 104 : "=a" (exchange_value) 105 : "r" (exchange_value), "a" (compare_value), "r" (dest) 106 : "cc", "memory"); 107 return exchange_value; 108 } 109 110 #ifdef AMD64 111 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; } 112 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; } 113 114 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { 115 intptr_t addend = add_value; 116 __asm__ __volatile__ ("lock xaddq %0,(%2)" 117 : "=r" (addend) 118 : "0" (addend), "r" (dest) 119 : "cc", "memory"); 120 return addend + add_value; 121 } 122 123 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { 124 return (void*)add_ptr(add_value, (volatile intptr_t*)dest); 125 } 126 127 inline void Atomic::inc_ptr(volatile intptr_t* dest) { 128 __asm__ __volatile__ ("lock addq $1,(%0)" 129 : 130 : "r" (dest) 131 : "cc", "memory"); 132 } 133 134 inline void Atomic::dec_ptr(volatile intptr_t* dest) { 135 __asm__ __volatile__ ("lock subq $1,(%0)" 136 : 137 : "r" (dest) 138 : "cc", "memory"); 139 } 140 141 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { 142 __asm__ __volatile__ ("xchgq (%2),%0" 143 : "=r" (exchange_value) 144 : "0" (exchange_value), "r" (dest) 145 : "memory"); 146 return exchange_value; 147 } 148 149 template<> 150 template<typename T> 151 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, 152 T volatile* dest, 153 T compare_value, 154 cmpxchg_memory_order /* order */) const { 155 STATIC_ASSERT(8 == sizeof(T)); 156 __asm__ __volatile__ ("lock cmpxchgq %1,(%3)" 157 : "=a" (exchange_value) 158 : "r" (exchange_value), "a" (compare_value), "r" (dest) 159 : "cc", "memory"); 160 return exchange_value; 161 } 162 163 inline jlong Atomic::load(const volatile jlong* src) { return *src; } 164 165 #else // !AMD64 166 167 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { 168 return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest); 169 } 170 171 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { 172 return (void*)Atomic::add((jint)add_value, (volatile jint*)dest); 173 } 174 175 176 inline void Atomic::inc_ptr(volatile intptr_t* dest) { 177 inc((volatile jint*)dest); 178 } 179 180 inline void Atomic::dec_ptr(volatile intptr_t* dest) { 181 dec((volatile jint*)dest); 182 } 183 184 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { 185 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest); 186 } 187 188 extern "C" { 189 // defined in linux_x86.s 190 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong); 191 void _Atomic_move_long(const volatile jlong* src, volatile jlong* dst); 192 } 193 194 template<> 195 template<typename T> 196 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, 197 T volatile* dest, 198 T compare_value, 199 cmpxchg_memory_order order) const { 200 STATIC_ASSERT(8 == sizeof(T)); 201 return cmpxchg_using_helper<jlong>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value); 202 } 203 204 inline jlong Atomic::load(const volatile jlong* src) { 205 volatile jlong dest; 206 _Atomic_move_long(src, &dest); 207 return dest; 208 } 209 210 inline void Atomic::store(jlong store_value, jlong* dest) { 211 _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest); 212 } 213 214 inline void Atomic::store(jlong store_value, volatile jlong* dest) { 215 _Atomic_move_long((volatile jlong*)&store_value, dest); 216 } 217 218 #endif // AMD64 219 220 #endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP