1/* 2 * Copyright (c) 1999, 2016, 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#include "runtime/os.hpp" 29 30// Implementation of class atomic 31 32inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; } 33inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; } 34inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; } 35inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; } 36inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; } 37 38inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; } 39inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; } 40inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; } 41inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; } 42inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; } 43 44 45// Adding a lock prefix to an instruction on MP machine 46#define LOCK_IF_MP(mp) "cmp $0, " #mp "; je 1f; lock; 1: " 47 48inline jint Atomic::add (jint add_value, volatile jint* dest) { 49 jint addend = add_value; 50 int mp = os::is_MP(); 51 __asm__ volatile ( LOCK_IF_MP(%3) "xaddl %0,(%2)" 52 : "=r" (addend) 53 : "0" (addend), "r" (dest), "r" (mp) 54 : "cc", "memory"); 55 return addend + add_value; 56} 57 58inline void Atomic::inc (volatile jint* dest) { 59 int mp = os::is_MP(); 60 __asm__ volatile (LOCK_IF_MP(%1) "addl $1,(%0)" : 61 : "r" (dest), "r" (mp) : "cc", "memory"); 62} 63 64inline void Atomic::inc_ptr(volatile void* dest) { 65 inc_ptr((volatile intptr_t*)dest); 66} 67 68inline void Atomic::dec (volatile jint* dest) { 69 int mp = os::is_MP(); 70 __asm__ volatile (LOCK_IF_MP(%1) "subl $1,(%0)" : 71 : "r" (dest), "r" (mp) : "cc", "memory"); 72} 73 74inline void Atomic::dec_ptr(volatile void* dest) { 75 dec_ptr((volatile intptr_t*)dest); 76} 77 78inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) { 79 __asm__ volatile ( "xchgl (%2),%0" 80 : "=r" (exchange_value) 81 : "0" (exchange_value), "r" (dest) 82 : "memory"); 83 return exchange_value; 84} 85 86inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) { 87 return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest); 88} 89 90#define VM_HAS_SPECIALIZED_CMPXCHG_BYTE 91inline jbyte Atomic::cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value, cmpxchg_memory_order order) { 92 int mp = os::is_MP(); 93 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgb %1,(%3)" 94 : "=a" (exchange_value) 95 : "q" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp) 96 : "cc", "memory"); 97 return exchange_value; 98} 99 100inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value, cmpxchg_memory_order order) { 101 int mp = os::is_MP(); 102 __asm__ volatile (LOCK_IF_MP(%4) "cmpxchgl %1,(%3)" 103 : "=a" (exchange_value) 104 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp) 105 : "cc", "memory"); 106 return exchange_value; 107} 108 109#ifdef AMD64 110inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; } 111inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; } 112 113inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { 114 intptr_t addend = add_value; 115 bool mp = os::is_MP(); 116 __asm__ __volatile__ (LOCK_IF_MP(%3) "xaddq %0,(%2)" 117 : "=r" (addend) 118 : "0" (addend), "r" (dest), "r" (mp) 119 : "cc", "memory"); 120 return addend + add_value; 121} 122 123inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { 124 return (void*)add_ptr(add_value, (volatile intptr_t*)dest); 125} 126 127inline void Atomic::inc_ptr(volatile intptr_t* dest) { 128 bool mp = os::is_MP(); 129 __asm__ __volatile__ (LOCK_IF_MP(%1) "addq $1,(%0)" 130 : 131 : "r" (dest), "r" (mp) 132 : "cc", "memory"); 133} 134 135inline void Atomic::dec_ptr(volatile intptr_t* dest) { 136 bool mp = os::is_MP(); 137 __asm__ __volatile__ (LOCK_IF_MP(%1) "subq $1,(%0)" 138 : 139 : "r" (dest), "r" (mp) 140 : "cc", "memory"); 141} 142 143inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { 144 __asm__ __volatile__ ("xchgq (%2),%0" 145 : "=r" (exchange_value) 146 : "0" (exchange_value), "r" (dest) 147 : "memory"); 148 return exchange_value; 149} 150 151inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value, cmpxchg_memory_order order) { 152 bool mp = os::is_MP(); 153 __asm__ __volatile__ (LOCK_IF_MP(%4) "cmpxchgq %1,(%3)" 154 : "=a" (exchange_value) 155 : "r" (exchange_value), "a" (compare_value), "r" (dest), "r" (mp) 156 : "cc", "memory"); 157 return exchange_value; 158} 159 160inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) { 161 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order); 162} 163 164inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value, cmpxchg_memory_order order) { 165 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order); 166} 167 168inline jlong Atomic::load(volatile jlong* src) { return *src; } 169 170#else // !AMD64 171 172inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) { 173 return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest); 174} 175 176inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) { 177 return (void*)Atomic::add((jint)add_value, (volatile jint*)dest); 178} 179 180 181inline void Atomic::inc_ptr(volatile intptr_t* dest) { 182 inc((volatile jint*)dest); 183} 184 185inline void Atomic::dec_ptr(volatile intptr_t* dest) { 186 dec((volatile jint*)dest); 187} 188 189inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) { 190 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest); 191} 192 193extern "C" { 194 // defined in linux_x86.s 195 jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool); 196 void _Atomic_move_long(volatile jlong* src, volatile jlong* dst); 197} 198 199inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value, cmpxchg_memory_order order) { 200 return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP()); 201} 202 203inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) { 204 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order); 205} 206 207inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value, cmpxchg_memory_order order) { 208 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order); 209} 210 211inline jlong Atomic::load(volatile jlong* src) { 212 volatile jlong dest; 213 _Atomic_move_long(src, &dest); 214 return dest; 215} 216 217inline void Atomic::store(jlong store_value, jlong* dest) { 218 _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest); 219} 220 221inline void Atomic::store(jlong store_value, volatile jlong* dest) { 222 _Atomic_move_long((volatile jlong*)&store_value, dest); 223} 224 225#endif // AMD64 226 227#endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP 228