/*+
−
 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.+
−
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
−
 *+
−
 * This code is free software; you can redistribute it and/or modify it+
−
 * under the terms of the GNU General Public License version 2 only, as+
−
 * published by the Free Software Foundation.+
−
 *+
−
 * This code is distributed in the hope that it will be useful, but WITHOUT+
−
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
−
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
−
 * version 2 for more details (a copy is included in the LICENSE file that+
−
 * accompanied this code).+
−
 *+
−
 * You should have received a copy of the GNU General Public License version+
−
 * 2 along with this work; if not, write to the Free Software Foundation,+
−
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
−
 *+
−
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
−
 * or visit www.oracle.com if you need additional information or have any+
−
 * questions.+
−
 *+
−
 */+
−
+
−
#ifndef OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP+
−
#define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP+
−
+
−
// Implementation of class atomic+
−
+
−
template<size_t byte_size>+
−
struct Atomic::PlatformAdd+
−
  : Atomic::FetchAndAdd<Atomic::PlatformAdd<byte_size> >+
−
{+
−
  template<typename I, typename D>+
−
  D fetch_and_add(I add_value, D volatile* dest) const;+
−
};+
−
+
−
template<>+
−
template<typename I, typename D>+
−
inline D Atomic::PlatformAdd<4>::fetch_and_add(I add_value, D volatile* dest) const {+
−
  STATIC_ASSERT(4 == sizeof(I));+
−
  STATIC_ASSERT(4 == sizeof(D));+
−
  D old_value;+
−
  __asm__ volatile (  "lock xaddl %0,(%2)"+
−
                    : "=r" (old_value)+
−
                    : "0" (add_value), "r" (dest)+
−
                    : "cc", "memory");+
−
  return old_value;+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformXchg<4>::operator()(T exchange_value,+
−
                                             T volatile* dest) const {+
−
  STATIC_ASSERT(4 == sizeof(T));+
−
  __asm__ volatile (  "xchgl (%2),%0"+
−
                    : "=r" (exchange_value)+
−
                    : "0" (exchange_value), "r" (dest)+
−
                    : "memory");+
−
  return exchange_value;+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,+
−
                                                T volatile* dest,+
−
                                                T compare_value,+
−
                                                cmpxchg_memory_order /* order */) const {+
−
  STATIC_ASSERT(1 == sizeof(T));+
−
  __asm__ volatile ("lock cmpxchgb %1,(%3)"+
−
                    : "=a" (exchange_value)+
−
                    : "q" (exchange_value), "a" (compare_value), "r" (dest)+
−
                    : "cc", "memory");+
−
  return exchange_value;+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,+
−
                                                T volatile* dest,+
−
                                                T compare_value,+
−
                                                cmpxchg_memory_order /* order */) const {+
−
  STATIC_ASSERT(4 == sizeof(T));+
−
  __asm__ volatile ("lock cmpxchgl %1,(%3)"+
−
                    : "=a" (exchange_value)+
−
                    : "r" (exchange_value), "a" (compare_value), "r" (dest)+
−
                    : "cc", "memory");+
−
  return exchange_value;+
−
}+
−
+
−
#ifdef AMD64+
−
+
−
template<>+
−
template<typename I, typename D>+
−
inline D Atomic::PlatformAdd<8>::fetch_and_add(I add_value, D volatile* dest) const {+
−
  STATIC_ASSERT(8 == sizeof(I));+
−
  STATIC_ASSERT(8 == sizeof(D));+
−
  D old_value;+
−
  __asm__ __volatile__ ("lock xaddq %0,(%2)"+
−
                        : "=r" (old_value)+
−
                        : "0" (add_value), "r" (dest)+
−
                        : "cc", "memory");+
−
  return old_value;+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformXchg<8>::operator()(T exchange_value,+
−
                                             T volatile* dest) const {+
−
  STATIC_ASSERT(8 == sizeof(T));+
−
  __asm__ __volatile__ ("xchgq (%2),%0"+
−
                        : "=r" (exchange_value)+
−
                        : "0" (exchange_value), "r" (dest)+
−
                        : "memory");+
−
  return exchange_value;+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,+
−
                                                T volatile* dest,+
−
                                                T compare_value,+
−
                                                cmpxchg_memory_order /* order */) const {+
−
  STATIC_ASSERT(8 == sizeof(T));+
−
  __asm__ __volatile__ ("lock cmpxchgq %1,(%3)"+
−
                        : "=a" (exchange_value)+
−
                        : "r" (exchange_value), "a" (compare_value), "r" (dest)+
−
                        : "cc", "memory");+
−
  return exchange_value;+
−
}+
−
+
−
#else // !AMD64+
−
+
−
extern "C" {+
−
  // defined in linux_x86.s+
−
  jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong);+
−
  void _Atomic_move_long(const volatile jlong* src, volatile jlong* dst);+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,+
−
                                                T volatile* dest,+
−
                                                T compare_value,+
−
                                                cmpxchg_memory_order order) const {+
−
  STATIC_ASSERT(8 == sizeof(T));+
−
  return cmpxchg_using_helper<jlong>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value);+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline T Atomic::PlatformLoad<8>::operator()(T const volatile* src) const {+
−
  STATIC_ASSERT(8 == sizeof(T));+
−
  volatile jlong dest;+
−
  _Atomic_move_long(reinterpret_cast<const volatile jlong*>(src), reinterpret_cast<volatile jlong*>(&dest));+
−
  return PrimitiveConversions::cast<T>(dest);+
−
}+
−
+
−
template<>+
−
template<typename T>+
−
inline void Atomic::PlatformStore<8>::operator()(T store_value,+
−
                                                 T volatile* dest) const {+
−
  STATIC_ASSERT(8 == sizeof(T));+
−
  _Atomic_move_long(reinterpret_cast<const volatile jlong*>(&store_value), reinterpret_cast<volatile jlong*>(dest));+
−
}+
−
+
−
#endif // AMD64+
−
+
−
#endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP+
−