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atomics: Add __nocheck atomic operations

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While the check against sizeof(void *) is appropriate for
normal usage within qemu, there are places in which we want
wider operaions and have checked for their existance.

Backports commit 84bca3927b36fb1d9a2ca85cbbdf9023d2b84678 from qemu
This commit is contained in:
Richard Henderson 2018-02-27 11:00:12 -05:00 committed by Lioncash
parent a59eef391e
commit ba1c63572e
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 28 additions and 7 deletions
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35
qemu/include/qemu/atomic.h
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@ -64,15 +64,21 @@ void _ReadWriteBarrier(void);
* no effect on the generated code but not using the atomic primitives
* will get flagged by sanitizers as a violation.
*/
#define atomic_read__nocheck(ptr) \
__atomic_load_n(ptr, __ATOMIC_RELAXED)
#define atomic_read(ptr) \
({ \
QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \
__atomic_load_n(ptr, __ATOMIC_RELAXED); \
atomic_read__nocheck(ptr); \
})
#define atomic_set__nocheck(ptr, i) \
__atomic_store_n(ptr, i, __ATOMIC_RELAXED)
#define atomic_set(ptr, i) do { \
QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \
__atomic_store_n(ptr, i, __ATOMIC_RELAXED); \
atomic_set__nocheck(ptr, i); \
} while(0)
/* See above: most compilers currently treat consume and acquire the
@ -115,20 +121,28 @@ void _ReadWriteBarrier(void);
/* All the remaining operations are fully sequentially consistent */
#define atomic_xchg__nocheck(ptr, i) ({ \
__atomic_exchange_n(ptr, (i), __ATOMIC_SEQ_CST); \
})
#define atomic_xchg(ptr, i) ({ \
QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \
__atomic_exchange_n(ptr, i, __ATOMIC_SEQ_CST); \
atomic_xchg__nocheck(ptr, i); \
})
/* Returns the eventual value, failed or not */
#define atomic_cmpxchg(ptr, old, new) \
#define atomic_cmpxchg__nocheck(ptr, old, new) ({ \
({ \
QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \
typeof(*ptr) _old = (old), _new = (new); \
__atomic_compare_exchange_n(ptr, &_old, new, false, \
__ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
})
#define atomic_cmpxchg(ptr, old, new) ({ \
QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \
atomic_cmpxchg__nocheck(ptr, old, new); \
})
/* Provide shorter names for GCC atomic builtins, return old value */
#define atomic_fetch_inc(ptr) __atomic_fetch_add(ptr, 1, __ATOMIC_SEQ_CST)
#define atomic_fetch_dec(ptr) __atomic_fetch_sub(ptr, 1, __ATOMIC_SEQ_CST)
@ -252,8 +266,11 @@ void _ReadWriteBarrier(void);
/* These will only be atomic if the processor does the fetch or store
* in a single issue memory operation
*/
#define atomic_read(ptr) (*(__typeof__(*ptr) volatile*) (ptr))
#define atomic_set(ptr, i) ((*(__typeof__(*ptr) volatile*) (ptr)) = (i))
#define atomic_read__nocheck(p) (*(__typeof__(*(p)) volatile*) (p))
#define atomic_set__nocheck(p, i) ((*(__typeof__(*(p)) volatile*) (p)) = (i))
#define atomic_read(ptr) atomic_read__nocheck(ptr)
#define atomic_set(ptr, i) atomic_set__nocheck(ptr,i)
/**
* atomic_rcu_read - reads a RCU-protected pointer to a local variable
@ -315,6 +332,8 @@ void _ReadWriteBarrier(void);
#endif
#endif
#define atomic_xchg__nocheck atomic_xchg
/* Provide shorter names for GCC atomic builtins. */
#ifdef _MSC_VER
// these return the new value (so we make it return the previous value)
@ -335,6 +354,7 @@ void _ReadWriteBarrier(void);
#define atomic_xor_fetch(ptr, n) (InterlockedXor((long*)ptr, n) ^ n)
#define atomic_cmpxchg(ptr, old, new) ((InterlockedCompareExchange(ptr, old, new)))
#define atomic_cmpxchg__nocheck(ptr, old, new) atomic_cmpxchg(ptr, old, new)
#else
// these return the previous value
#define atomic_fetch_inc(ptr) __sync_fetch_and_add(ptr, 1)
@ -354,6 +374,7 @@ void _ReadWriteBarrier(void);
#define atomic_xor_fetch(ptr, n) __sync_xor_and_fetch(ptr, n)
#define atomic_cmpxchg(ptr, old, new) __sync_val_compare_and_swap(ptr, old, new)
#define atomic_cmpxchg__nocheck(ptr, old, new) atomic_cmpxchg(ptr, old, new)
#endif
/* And even shorter names that return void. */