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_BSD_X86_VM_ATOMIC_BSD_X86_HPP 26 #define OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP 27 28 // Implementation of class atomic 29 30 template<size_t byte_size> 31 struct Atomic::PlatformAdd 32 : Atomic::FetchAndAdd<Atomic::PlatformAdd<byte_size> > 33 { 34 template<typename I, typename D> 35 D fetch_and_add(I add_value, D volatile* dest) const; 36 }; 37 38 template<> 39 template<typename I, typename D> 40 inline D Atomic::PlatformAdd<4>::fetch_and_add(I add_value, D volatile* dest) const { 41 STATIC_ASSERT(4 == sizeof(I)); 42 STATIC_ASSERT(4 == sizeof(D)); 43 D old_value; 44 __asm__ volatile ( "lock xaddl %0,(%2)" 45 : "=r" (old_value) 46 : "0" (add_value), "r" (dest) 47 : "cc", "memory"); 48 return old_value; 49 } 50 51 template<> 52 template<typename T> 53 inline T Atomic::PlatformXchg<4>::operator()(T exchange_value, 54 T volatile* dest) const { 55 STATIC_ASSERT(4 == sizeof(T)); 56 __asm__ volatile ( "xchgl (%2),%0" 57 : "=r" (exchange_value) 58 : "0" (exchange_value), "r" (dest) 59 : "memory"); 60 return exchange_value; 61 } 62 63 template<> 64 template<typename T> 65 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value, 66 T volatile* dest, 67 T compare_value, 68 cmpxchg_memory_order /* order */) const { 69 STATIC_ASSERT(1 == sizeof(T)); 70 __asm__ volatile ( "lock cmpxchgb %1,(%3)" 71 : "=a" (exchange_value) 72 : "q" (exchange_value), "a" (compare_value), "r" (dest) 73 : "cc", "memory"); 74 return exchange_value; 75 } 76 77 template<> 78 template<typename T> 79 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value, 80 T volatile* dest, 81 T compare_value, 82 cmpxchg_memory_order /* order */) const { 83 STATIC_ASSERT(4 == sizeof(T)); 84 __asm__ volatile ( "lock cmpxchgl %1,(%3)" 85 : "=a" (exchange_value) 86 : "r" (exchange_value), "a" (compare_value), "r" (dest) 87 : "cc", "memory"); 88 return exchange_value; 89 } 90 91 #ifdef AMD64 92 template<> 93 template<typename I, typename D> 94 inline D Atomic::PlatformAdd<8>::fetch_and_add(I add_value, D volatile* dest) const { 95 STATIC_ASSERT(8 == sizeof(I)); 96 STATIC_ASSERT(8 == sizeof(D)); 97 D old_value; 98 __asm__ __volatile__ ( "lock xaddq %0,(%2)" 99 : "=r" (old_value) 100 : "0" (add_value), "r" (dest) 101 : "cc", "memory"); 102 return old_value; 103 } 104 105 template<> 106 template<typename T> 107 inline T Atomic::PlatformXchg<8>::operator()(T exchange_value, 108 T volatile* dest) const { 109 STATIC_ASSERT(8 == sizeof(T)); 110 __asm__ __volatile__ ("xchgq (%2),%0" 111 : "=r" (exchange_value) 112 : "0" (exchange_value), "r" (dest) 113 : "memory"); 114 return exchange_value; 115 } 116 117 template<> 118 template<typename T> 119 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, 120 T volatile* dest, 121 T compare_value, 122 cmpxchg_memory_order /* order */) const { 123 STATIC_ASSERT(8 == sizeof(T)); 124 __asm__ __volatile__ ( "lock cmpxchgq %1,(%3)" 125 : "=a" (exchange_value) 126 : "r" (exchange_value), "a" (compare_value), "r" (dest) 127 : "cc", "memory"); 128 return exchange_value; 129 } 130 131 #else // !AMD64 132 133 extern "C" { 134 // defined in bsd_x86.s 135 int64_t _Atomic_cmpxchg_long(int64_t, volatile int64_t*, int64_t, bool); 136 void _Atomic_move_long(const volatile int64_t* src, volatile int64_t* dst); 137 } 138 139 template<> 140 template<typename T> 141 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, 142 T volatile* dest, 143 T compare_value, 144 cmpxchg_memory_order order) const { 145 STATIC_ASSERT(8 == sizeof(T)); 146 return cmpxchg_using_helper<int64_t>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value); 147 } 148 149 template<> 150 template<typename T> 151 inline T Atomic::PlatformLoad<8>::operator()(T const volatile* src) const { 152 STATIC_ASSERT(8 == sizeof(T)); 153 volatile int64_t dest; 154 _Atomic_move_long(reinterpret_cast<const volatile int64_t*>(src), reinterpret_cast<volatile int64_t*>(&dest)); 155 return PrimitiveConversions::cast<T>(dest); 156 } 157 158 template<> 159 template<typename T> 160 inline void Atomic::PlatformStore<8>::operator()(T store_value, 161 T volatile* dest) const { 162 STATIC_ASSERT(8 == sizeof(T)); 163 _Atomic_move_long(reinterpret_cast<const volatile int64_t*>(&store_value), reinterpret_cast<volatile int64_t*>(dest)); 164 } 165 166 #endif // AMD64 167 168 #endif // OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP