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.
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
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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)
69 #warning Should we use cmpxchg8b or a generic version?
70 return generic_compare_and_swap(p, oldval, newval);
75 * An atomic compare and swap for pointer values.
77 * @param p Pointer to memory address.
78 * @param oldval Old value to be expected.
79 * @param newval New value to be stored.
81 * @return value of the memory location before the store
83 inline void* Atomic::compare_and_swap(volatile void** p, void* oldval, void* newval)
85 return (void*) compare_and_swap((volatile uint32_t*) p, (uint32_t) oldval, (uint32_t) newval);
92 inline void Atomic::memory_barrier(void)
94 __asm__ __volatile__ ("lock; add $0, 0(%%esp)" : : : "memory" );
99 * A write memory barrier.
101 inline void Atomic::write_memory_barrier(void)
103 __asm__ __volatile__ ("" : : : "memory");
108 * An instruction barrier.
110 inline void Atomic::instruction_barrier(void)
112 // We need the "memory" constraint here because compare_and_swap does not
114 __asm__ __volatile__ ("" : : : "memory");
117 #endif // _MD_ATOMIC_HPP
121 * These are local overrides for various environment variables in Emacs.
122 * Please do not remove this and leave it at the end of the file, where
123 * Emacs will automagically detect them.
124 * ---------------------------------------------------------------------
127 * indent-tabs-mode: t
131 * vim:noexpandtab:sw=4:ts=4: