1 /* src/vm/jit/x86_64/atomic.hpp - x86_64 atomic instructions
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 #ifndef _MD_ATOMIC_HPP
27 #define _MD_ATOMIC_HPP
33 #include "threads/atomic.hpp"
37 * An atomic compare and swap for 32-bit integer values.
39 * @param p Pointer to memory address.
40 * @param oldval Old value to be expected.
41 * @param newval New value to be stored.
43 * @return value of the memory location before the store
45 inline uint32_t Atomic::compare_and_swap(volatile uint32_t *p, uint32_t oldval, uint32_t newval)
49 __asm__ __volatile__ ("lock; cmpxchgl %2, %1"
50 : "=a" (result), "=m" (*p)
51 : "r" (newval), "m" (*p), "0" (oldval)
59 * An atomic compare and swap for 64-bit integer values.
61 * @param p Pointer to memory address.
62 * @param oldval Old value to be expected.
63 * @param newval New value to be stored.
65 * @return value of the memory location before the store
67 inline uint64_t Atomic::compare_and_swap(volatile uint64_t *p, uint64_t oldval, uint64_t newval)
71 __asm__ __volatile__ ("lock; cmpxchgq %2, %1"
72 : "=a" (result), "=m" (*p)
73 : "r" (newval), "m" (*p), "0" (oldval)
81 * An atomic compare and swap for pointer values.
83 * @param p Pointer to memory address.
84 * @param oldval Old value to be expected.
85 * @param newval New value to be stored.
87 * @return value of the memory location before the store
89 inline void* Atomic::compare_and_swap(volatile void** p, void* oldval, void* newval)
91 return (void*) compare_and_swap((volatile uint64_t*) p, (uint64_t) oldval, (uint64_t) newval);
98 inline void Atomic::memory_barrier(void)
100 __asm__ __volatile__ ("mfence" : : : "memory");
105 * A write memory barrier.
107 inline void Atomic::write_memory_barrier(void)
109 __asm__ __volatile__ ("" : : : "memory");
114 * An instruction barrier.
116 inline void Atomic::instruction_barrier(void)
118 // We need the "memory" constraint here because compare_and_swap does not
120 __asm__ __volatile__ ("" : : : "memory");
123 #endif // _MD_ATOMIC_HPP
127 * These are local overrides for various environment variables in Emacs.
128 * Please do not remove this and leave it at the end of the file, where
129 * Emacs will automagically detect them.
130 * ---------------------------------------------------------------------
133 * indent-tabs-mode: t
137 * vim:noexpandtab:sw=4:ts=4: