1 /* src/vm/jit/i386/atomic.hpp - i386 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
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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
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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 static uint32_t Atomic_compare_and_swap_32(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));
58 * An atomic compare and swap for 64-bit integer values.
60 * @param p Pointer to memory address.
61 * @param oldval Old value to be expected.
62 * @param newval New value to be stored.
64 * @return value of the memory location before the store
66 inline static uint64_t Atomic_compare_and_swap_64(volatile uint64_t *p, uint64_t oldval, uint64_t newval)
68 #warning Should we use cmpxchg8b or a generic version?
74 * An atomic compare and swap for pointer values.
76 * @param p Pointer to memory address.
77 * @param oldval Old value to be expected.
78 * @param newval New value to be stored.
80 * @return value of the memory location before the store
82 inline static void* Atomic_compare_and_swap_ptr(volatile void** p, void* oldval, void* newval)
84 return (void*) Atomic_compare_and_swap_32((volatile uint32_t*) p, (uint32_t) oldval, (uint32_t) newval);
91 inline static void Atomic_memory_barrier(void)
93 __asm__ __volatile__ ("lock; add $0, 0(%%esp)" : : : "memory" );
97 #define STORE_ORDER_BARRIER() __asm__ __volatile__ ("" : : : "memory");
98 #define MEMORY_BARRIER_AFTER_ATOMIC() /* nothing */
100 #endif // _MD_ATOMIC_HPP
104 * These are local overrides for various environment variables in Emacs.
105 * Please do not remove this and leave it at the end of the file, where
106 * Emacs will automagically detect them.
107 * ---------------------------------------------------------------------
110 * indent-tabs-mode: t
114 * vim:noexpandtab:sw=4:ts=4: