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 #include "runtime/os.hpp"
  29 
  30 // Implementation of class atomic
  31 
  32 inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }
  33 inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }
  34 inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }
  35 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
  36 inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }
  37 
  38 inline void Atomic::store    (jbyte    store_value, volatile jbyte*    dest) { *dest = store_value; }
  39 inline void Atomic::store    (jshort   store_value, volatile jshort*   dest) { *dest = store_value; }
  40 inline void Atomic::store    (jint     store_value, volatile jint*     dest) { *dest = store_value; }
  41 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
  42 inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }
  43 
  44 
  45 inline jint     Atomic::add    (jint     add_value, volatile jint*     dest) {
  46   jint addend = add_value;
  47   __asm__ volatile (  "lock xaddl %0,(%2)"
  48                     : "=r" (addend)
  49                     : "0" (addend), "r" (dest)
  50                     : "cc", "memory");
  51   return addend + add_value;
  52 }
  53 
  54 inline void Atomic::inc    (volatile jint*     dest) {
  55   __asm__ volatile (  "lock addl $1,(%0)" :
  56                     : "r" (dest) : "cc", "memory");
  57 }
  58 
  59 inline void Atomic::inc_ptr(volatile void*     dest) {
  60   inc_ptr((volatile intptr_t*)dest);
  61 }
  62 
  63 inline void Atomic::dec    (volatile jint*     dest) {
  64   __asm__ volatile (  "lock subl $1,(%0)" :
  65                     : "r" (dest) : "cc", "memory");
  66 }
  67 
  68 inline void Atomic::dec_ptr(volatile void*     dest) {
  69   dec_ptr((volatile intptr_t*)dest);
  70 }
  71 
  72 inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
  73   __asm__ volatile (  "xchgl (%2),%0"
  74                     : "=r" (exchange_value)
  75                     : "0" (exchange_value), "r" (dest)
  76                     : "memory");
  77   return exchange_value;
  78 }
  79 
  80 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
  81   return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
  82 }
  83 
  84 #define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
  85 inline jbyte    Atomic::cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value, cmpxchg_memory_order order) {
  86   __asm__ volatile (  "lock cmpxchgb %1,(%3)"
  87                     : "=a" (exchange_value)
  88                     : "q" (exchange_value), "a" (compare_value), "r" (dest)
  89                     : "cc", "memory");
  90   return exchange_value;
  91 }
  92 
  93 inline jint     Atomic::cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value, cmpxchg_memory_order order) {
  94   __asm__ volatile (  "lock cmpxchgl %1,(%3)"
  95                     : "=a" (exchange_value)
  96                     : "r" (exchange_value), "a" (compare_value), "r" (dest)
  97                     : "cc", "memory");
  98   return exchange_value;
  99 }
 100 
 101 #ifdef AMD64
 102 inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }
 103 inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }
 104 
 105 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
 106   intptr_t addend = add_value;
 107   __asm__ __volatile__ (  "lock xaddq %0,(%2)"
 108                         : "=r" (addend)
 109                         : "0" (addend), "r" (dest)
 110                         : "cc", "memory");
 111   return addend + add_value;
 112 }
 113 
 114 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
 115   return (void*)add_ptr(add_value, (volatile intptr_t*)dest);
 116 }
 117 
 118 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 119   __asm__ __volatile__ (  "lock addq $1,(%0)"
 120                         :
 121                         : "r" (dest)
 122                         : "cc", "memory");
 123 }
 124 
 125 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 126   __asm__ __volatile__ (  "lock subq $1,(%0)"
 127                         :
 128                         : "r" (dest)
 129                         : "cc", "memory");
 130 }
 131 
 132 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 133   __asm__ __volatile__ ("xchgq (%2),%0"
 134                         : "=r" (exchange_value)
 135                         : "0" (exchange_value), "r" (dest)
 136                         : "memory");
 137   return exchange_value;
 138 }
 139 
 140 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
 141   __asm__ __volatile__ (  "lock cmpxchgq %1,(%3)"
 142                         : "=a" (exchange_value)
 143                         : "r" (exchange_value), "a" (compare_value), "r" (dest)
 144                         : "cc", "memory");
 145   return exchange_value;
 146 }
 147 
 148 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
 149   return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
 150 }
 151 
 152 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
 153   return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value, order);
 154 }
 155 
 156 inline jlong Atomic::load(volatile jlong* src) { return *src; }
 157 
 158 #else // !AMD64
 159 
 160 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
 161   return (intptr_t)Atomic::add((jint)add_value, (volatile jint*)dest);
 162 }
 163 
 164 inline void*    Atomic::add_ptr(intptr_t add_value, volatile void*     dest) {
 165   return (void*)Atomic::add((jint)add_value, (volatile jint*)dest);
 166 }
 167 
 168 
 169 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 170   inc((volatile jint*)dest);
 171 }
 172 
 173 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 174   dec((volatile jint*)dest);
 175 }
 176 
 177 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 178   return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
 179 }
 180 
 181 extern "C" {
 182   // defined in bsd_x86.s
 183   jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
 184   void _Atomic_move_long(volatile jlong* src, volatile jlong* dst);
 185 }
 186 
 187 inline jlong    Atomic::cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value, cmpxchg_memory_order order) {
 188   return _Atomic_cmpxchg_long(exchange_value, dest, compare_value, os::is_MP());
 189 }
 190 
 191 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value, cmpxchg_memory_order order) {
 192   return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
 193 }
 194 
 195 inline void*    Atomic::cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value, cmpxchg_memory_order order) {
 196   return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value, order);
 197 }
 198 
 199 inline jlong Atomic::load(volatile jlong* src) {
 200   volatile jlong dest;
 201   _Atomic_move_long(src, &dest);
 202   return dest;
 203 }
 204 
 205 inline void Atomic::store(jlong store_value, jlong* dest) {
 206   _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
 207 }
 208 
 209 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
 210   _Atomic_move_long((volatile jlong*)&store_value, dest);
 211 }
 212 
 213 #endif // AMD64
 214 
 215 #endif // OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP