1 /* 2 * Copyright (c) 2003, 2013, 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_ORDERACCESS_LINUX_X86_INLINE_HPP 26 #define OS_CPU_LINUX_X86_VM_ORDERACCESS_LINUX_X86_INLINE_HPP 27 28 #include "runtime/atomic.inline.hpp" 29 #include "runtime/orderAccess.hpp" 30 #include "runtime/os.hpp" 31 #include "vm_version_x86.hpp" 32 33 // Implementation of class OrderAccess. 34 35 inline void OrderAccess::loadload() { acquire(); } 36 inline void OrderAccess::storestore() { release(); } 37 inline void OrderAccess::loadstore() { acquire(); } 38 inline void OrderAccess::storeload() { fence(); } 39 40 inline void OrderAccess::acquire() { 41 volatile intptr_t local_dummy; 42 #ifdef AMD64 43 __asm__ volatile ("movq 0(%%rsp), %0" : "=r" (local_dummy) : : "memory"); 44 #else 45 __asm__ volatile ("movl 0(%%esp),%0" : "=r" (local_dummy) : : "memory"); 46 #endif // AMD64 47 } 48 49 inline void OrderAccess::release() { 50 // Avoid hitting the same cache-line from 51 // different threads. 52 volatile jint local_dummy = 0; 53 } 54 55 inline void OrderAccess::fence() { 56 if (os::is_MP()) { 57 // always use locked addl since mfence is sometimes expensive 58 #ifdef AMD64 59 __asm__ volatile ("lock; addl $0,0(%%rsp)" : : : "cc", "memory"); 60 #else 61 __asm__ volatile ("lock; addl $0,0(%%esp)" : : : "cc", "memory"); 62 #endif 63 } 64 } 65 66 inline jbyte OrderAccess::load_acquire(volatile jbyte* p) { return *p; } 67 inline jshort OrderAccess::load_acquire(volatile jshort* p) { return *p; } 68 inline jint OrderAccess::load_acquire(volatile jint* p) { return *p; } 69 inline jlong OrderAccess::load_acquire(volatile jlong* p) { return Atomic::load(p); } 70 inline jubyte OrderAccess::load_acquire(volatile jubyte* p) { return *p; } 71 inline jushort OrderAccess::load_acquire(volatile jushort* p) { return *p; } 72 inline juint OrderAccess::load_acquire(volatile juint* p) { return *p; } 73 inline julong OrderAccess::load_acquire(volatile julong* p) { return Atomic::load((volatile jlong*)p); } 74 inline jfloat OrderAccess::load_acquire(volatile jfloat* p) { return *p; } 75 inline jdouble OrderAccess::load_acquire(volatile jdouble* p) { return jdouble_cast(Atomic::load((volatile jlong*)p)); } 76 77 inline intptr_t OrderAccess::load_ptr_acquire(volatile intptr_t* p) { return *p; } 78 inline void* OrderAccess::load_ptr_acquire(volatile void* p) { return *(void* volatile *)p; } 79 inline void* OrderAccess::load_ptr_acquire(const volatile void* p) { return *(void* const volatile *)p; } 80 81 inline void OrderAccess::release_store(volatile jbyte* p, jbyte v) { *p = v; } 82 inline void OrderAccess::release_store(volatile jshort* p, jshort v) { *p = v; } 83 inline void OrderAccess::release_store(volatile jint* p, jint v) { *p = v; } 84 inline void OrderAccess::release_store(volatile jlong* p, jlong v) { Atomic::store(v, p); } 85 inline void OrderAccess::release_store(volatile jubyte* p, jubyte v) { *p = v; } 86 inline void OrderAccess::release_store(volatile jushort* p, jushort v) { *p = v; } 87 inline void OrderAccess::release_store(volatile juint* p, juint v) { *p = v; } 88 inline void OrderAccess::release_store(volatile julong* p, julong v) { Atomic::store((jlong)v, (volatile jlong*)p); } 89 inline void OrderAccess::release_store(volatile jfloat* p, jfloat v) { *p = v; } 90 inline void OrderAccess::release_store(volatile jdouble* p, jdouble v) { release_store((volatile jlong *)p, jlong_cast(v)); } 91 92 inline void OrderAccess::release_store_ptr(volatile intptr_t* p, intptr_t v) { *p = v; } 93 inline void OrderAccess::release_store_ptr(volatile void* p, void* v) { *(void* volatile *)p = v; } 94 95 inline void OrderAccess::store_fence(jbyte* p, jbyte v) { 96 __asm__ volatile ( "xchgb (%2),%0" 97 : "=q" (v) 98 : "0" (v), "r" (p) 99 : "memory"); 100 } 101 inline void OrderAccess::store_fence(jshort* p, jshort v) { 102 __asm__ volatile ( "xchgw (%2),%0" 103 : "=r" (v) 104 : "0" (v), "r" (p) 105 : "memory"); 106 } 107 inline void OrderAccess::store_fence(jint* p, jint v) { 108 __asm__ volatile ( "xchgl (%2),%0" 109 : "=r" (v) 110 : "0" (v), "r" (p) 111 : "memory"); 112 } 113 114 inline void OrderAccess::store_fence(jlong* p, jlong v) { 115 #ifdef AMD64 116 __asm__ __volatile__ ("xchgq (%2), %0" 117 : "=r" (v) 118 : "0" (v), "r" (p) 119 : "memory"); 120 #else 121 *p = v; fence(); 122 #endif // AMD64 123 } 124 125 // AMD64 copied the bodies for the the signed version. 32bit did this. As long as the 126 // compiler does the inlining this is simpler. 127 inline void OrderAccess::store_fence(jubyte* p, jubyte v) { store_fence((jbyte*)p, (jbyte)v); } 128 inline void OrderAccess::store_fence(jushort* p, jushort v) { store_fence((jshort*)p, (jshort)v); } 129 inline void OrderAccess::store_fence(juint* p, juint v) { store_fence((jint*)p, (jint)v); } 130 inline void OrderAccess::store_fence(julong* p, julong v) { store_fence((jlong*)p, (jlong)v); } 131 inline void OrderAccess::store_fence(jfloat* p, jfloat v) { *p = v; fence(); } 132 inline void OrderAccess::store_fence(jdouble* p, jdouble v) { store_fence((jlong*)p, jlong_cast(v)); } 133 134 inline void OrderAccess::store_ptr_fence(intptr_t* p, intptr_t v) { 135 #ifdef AMD64 136 __asm__ __volatile__ ("xchgq (%2), %0" 137 : "=r" (v) 138 : "0" (v), "r" (p) 139 : "memory"); 140 #else 141 store_fence((jint*)p, (jint)v); 142 #endif // AMD64 143 } 144 145 inline void OrderAccess::store_ptr_fence(void** p, void* v) { 146 #ifdef AMD64 147 __asm__ __volatile__ ("xchgq (%2), %0" 148 : "=r" (v) 149 : "0" (v), "r" (p) 150 : "memory"); 151 #else 152 store_fence((jint*)p, (jint)v); 153 #endif // AMD64 154 } 155 156 // Must duplicate definitions instead of calling store_fence because we don't want to cast away volatile. 157 inline void OrderAccess::release_store_fence(volatile jbyte* p, jbyte v) { 158 __asm__ volatile ( "xchgb (%2),%0" 159 : "=q" (v) 160 : "0" (v), "r" (p) 161 : "memory"); 162 } 163 inline void OrderAccess::release_store_fence(volatile jshort* p, jshort v) { 164 __asm__ volatile ( "xchgw (%2),%0" 165 : "=r" (v) 166 : "0" (v), "r" (p) 167 : "memory"); 168 } 169 inline void OrderAccess::release_store_fence(volatile jint* p, jint v) { 170 __asm__ volatile ( "xchgl (%2),%0" 171 : "=r" (v) 172 : "0" (v), "r" (p) 173 : "memory"); 174 } 175 176 inline void OrderAccess::release_store_fence(volatile jlong* p, jlong v) { 177 #ifdef AMD64 178 __asm__ __volatile__ ( "xchgq (%2), %0" 179 : "=r" (v) 180 : "0" (v), "r" (p) 181 : "memory"); 182 #else 183 release_store(p, v); fence(); 184 #endif // AMD64 185 } 186 187 inline void OrderAccess::release_store_fence(volatile jubyte* p, jubyte v) { release_store_fence((volatile jbyte*)p, (jbyte)v); } 188 inline void OrderAccess::release_store_fence(volatile jushort* p, jushort v) { release_store_fence((volatile jshort*)p, (jshort)v); } 189 inline void OrderAccess::release_store_fence(volatile juint* p, juint v) { release_store_fence((volatile jint*)p, (jint)v); } 190 inline void OrderAccess::release_store_fence(volatile julong* p, julong v) { release_store_fence((volatile jlong*)p, (jlong)v); } 191 192 inline void OrderAccess::release_store_fence(volatile jfloat* p, jfloat v) { *p = v; fence(); } 193 inline void OrderAccess::release_store_fence(volatile jdouble* p, jdouble v) { release_store_fence((volatile jlong*)p, jlong_cast(v)); } 194 195 inline void OrderAccess::release_store_ptr_fence(volatile intptr_t* p, intptr_t v) { 196 #ifdef AMD64 197 __asm__ __volatile__ ( "xchgq (%2), %0" 198 : "=r" (v) 199 : "0" (v), "r" (p) 200 : "memory"); 201 #else 202 release_store_fence((volatile jint*)p, (jint)v); 203 #endif // AMD64 204 } 205 inline void OrderAccess::release_store_ptr_fence(volatile void* p, void* v) { 206 #ifdef AMD64 207 __asm__ __volatile__ ( "xchgq (%2), %0" 208 : "=r" (v) 209 : "0" (v), "r" (p) 210 : "memory"); 211 #else 212 release_store_fence((volatile jint*)p, (jint)v); 213 #endif // AMD64 214 } 215 216 #endif // OS_CPU_LINUX_X86_VM_ORDERACCESS_LINUX_X86_INLINE_HPP