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 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 template<size_t byte_size>
  44 struct Atomic::PlatformAdd
  45   : Atomic::FetchAndAdd<Atomic::PlatformAdd<byte_size> >
  46 {
  47   template<typename I, typename D>
  48   D fetch_and_add(I add_value, D volatile* dest) const;
  49 };
  50 
  51 template<>
  52 template<typename I, typename D>
  53 inline D Atomic::PlatformAdd<4>::fetch_and_add(I add_value, D volatile* dest) const {
  54   STATIC_ASSERT(4 == sizeof(I));
  55   STATIC_ASSERT(4 == sizeof(D));
  56   D old_value;
  57   __asm__ volatile (  "lock xaddl %0,(%2)"
  58                     : "=r" (old_value)
  59                     : "0" (add_value), "r" (dest)
  60                     : "cc", "memory");
  61   return old_value;
  62 }
  63 
  64 inline void Atomic::inc    (volatile jint*     dest) {
  65   __asm__ volatile (  "lock addl $1,(%0)" :
  66                     : "r" (dest) : "cc", "memory");
  67 }
  68 
  69 inline void Atomic::inc_ptr(volatile void*     dest) {
  70   inc_ptr((volatile intptr_t*)dest);
  71 }
  72 
  73 inline void Atomic::dec    (volatile jint*     dest) {
  74   __asm__ volatile (  "lock subl $1,(%0)" :
  75                     : "r" (dest) : "cc", "memory");
  76 }
  77 
  78 inline void Atomic::dec_ptr(volatile void*     dest) {
  79   dec_ptr((volatile intptr_t*)dest);
  80 }
  81 
  82 inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {
  83   __asm__ volatile (  "xchgl (%2),%0"
  84                     : "=r" (exchange_value)
  85                     : "0" (exchange_value), "r" (dest)
  86                     : "memory");
  87   return exchange_value;
  88 }
  89 
  90 inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {
  91   return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);
  92 }
  93 
  94 template<>
  95 template<typename T>
  96 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,
  97                                                 T volatile* dest,
  98                                                 T compare_value,
  99                                                 cmpxchg_memory_order /* order */) const {
 100   STATIC_ASSERT(1 == sizeof(T));
 101   __asm__ volatile (  "lock cmpxchgb %1,(%3)"
 102                     : "=a" (exchange_value)
 103                     : "q" (exchange_value), "a" (compare_value), "r" (dest)
 104                     : "cc", "memory");
 105   return exchange_value;
 106 }
 107 
 108 template<>
 109 template<typename T>
 110 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
 111                                                 T volatile* dest,
 112                                                 T compare_value,
 113                                                 cmpxchg_memory_order /* order */) const {
 114   STATIC_ASSERT(4 == sizeof(T));
 115   __asm__ volatile (  "lock cmpxchgl %1,(%3)"
 116                     : "=a" (exchange_value)
 117                     : "r" (exchange_value), "a" (compare_value), "r" (dest)
 118                     : "cc", "memory");
 119   return exchange_value;
 120 }
 121 
 122 #ifdef AMD64
 123 inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }
 124 inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }
 125 
 126 template<>
 127 template<typename I, typename D>
 128 inline D Atomic::PlatformAdd<8>::fetch_and_add(I add_value, D volatile* dest) const {
 129   STATIC_ASSERT(8 == sizeof(I));
 130   STATIC_ASSERT(8 == sizeof(D));
 131   D old_value;
 132   __asm__ __volatile__ (  "lock xaddq %0,(%2)"
 133                         : "=r" (old_value)
 134                         : "0" (add_value), "r" (dest)
 135                         : "cc", "memory");
 136   return old_value;
 137 }
 138 
 139 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 140   __asm__ __volatile__ (  "lock addq $1,(%0)"
 141                         :
 142                         : "r" (dest)
 143                         : "cc", "memory");
 144 }
 145 
 146 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 147   __asm__ __volatile__ (  "lock subq $1,(%0)"
 148                         :
 149                         : "r" (dest)
 150                         : "cc", "memory");
 151 }
 152 
 153 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 154   __asm__ __volatile__ ("xchgq (%2),%0"
 155                         : "=r" (exchange_value)
 156                         : "0" (exchange_value), "r" (dest)
 157                         : "memory");
 158   return exchange_value;
 159 }
 160 
 161 template<>
 162 template<typename T>
 163 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
 164                                                 T volatile* dest,
 165                                                 T compare_value,
 166                                                 cmpxchg_memory_order /* order */) const {
 167   STATIC_ASSERT(8 == sizeof(T));
 168   __asm__ __volatile__ (  "lock cmpxchgq %1,(%3)"
 169                         : "=a" (exchange_value)
 170                         : "r" (exchange_value), "a" (compare_value), "r" (dest)
 171                         : "cc", "memory");
 172   return exchange_value;
 173 }
 174 
 175 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
 176 
 177 #else // !AMD64
 178 
 179 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
 180   inc((volatile jint*)dest);
 181 }
 182 
 183 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
 184   dec((volatile jint*)dest);
 185 }
 186 
 187 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
 188   return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
 189 }
 190 
 191 extern "C" {
 192   // defined in bsd_x86.s
 193   jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
 194   void _Atomic_move_long(const volatile jlong* src, volatile jlong* dst);
 195 }
 196 
 197 template<>
 198 template<typename T>
 199 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
 200                                                 T volatile* dest,
 201                                                 T compare_value,
 202                                                 cmpxchg_memory_order order) const {
 203   STATIC_ASSERT(8 == sizeof(T));
 204   return cmpxchg_using_helper<jlong>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value);
 205 }
 206 
 207 inline jlong Atomic::load(const volatile jlong* src) {
 208   volatile jlong dest;
 209   _Atomic_move_long(src, &dest);
 210   return dest;
 211 }
 212 
 213 inline void Atomic::store(jlong store_value, jlong* dest) {
 214   _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
 215 }
 216 
 217 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
 218   _Atomic_move_long((volatile jlong*)&store_value, dest);
 219 }
 220 
 221 #endif // AMD64
 222 
 223 #endif // OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP