/*
* 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.
*
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*/
#ifndef OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP
#define OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP
// Implementation of class atomic
inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
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
inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
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;
}
inline jlong Atomic::load(const volatile jlong* src) { return *src; }
#else // !AMD64
extern "C" {
// defined in bsd_x86.s
jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong, bool);
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);
}
inline jlong Atomic::load(const volatile jlong* src) {
volatile jlong dest;
_Atomic_move_long(src, &dest);
return dest;
}
inline void Atomic::store(jlong store_value, jlong* dest) {
_Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);
}
inline void Atomic::store(jlong store_value, volatile jlong* dest) {
_Atomic_move_long((volatile jlong*)&store_value, dest);
}
#endif // AMD64
#endif // OS_CPU_BSD_X86_VM_ATOMIC_BSD_X86_HPP