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#ifndef PL_ATOMIC_OPS_H
#define PL_ATOMIC_OPS_H
/* compiler-only memory barrier, for use around locks */
#define pl_barrier() do { \
asm volatile("" ::: "memory"); \
} while (0)
#if defined(__i386__) || defined (__i486__) || defined (__i586__) || defined (__i686__) || defined (__x86_64__)
/* full memory barrier using mfence when SSE2 is supported, falling back to
* "lock add %esp" (gcc uses "lock add" or "lock or").
*/
#if defined(__SSE2__)
#define pl_mb() do { \
asm volatile("mfence" ::: "memory"); \
} while (0)
#elif defined(__x86_64__)
#define pl_mb() do { \
asm volatile("lock addl $0,0 (%%rsp)" ::: "memory", "cc"); \
} while (0)
#else /* ix86 */
#define pl_mb() do { \
asm volatile("lock addl $0,0 (%%esp)" ::: "memory", "cc"); \
} while (0)
#endif /* end of pl_mb() case for sse2/x86_64/x86 */
/*
* Generic functions common to the x86 family
*/
#define pl_cpu_relax() do { \
asm volatile("rep;nop\n"); \
} while (0)
/* increment integer value pointed to by pointer <ptr>, and return non-zero if
* result is non-null.
*/
#define pl_inc(ptr) ( \
(sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \
unsigned char ret; \
asm volatile("lock incq %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 4) ? ({ \
unsigned char ret; \
asm volatile("lock incl %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 2) ? ({ \
unsigned char ret; \
asm volatile("lock incw %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 1) ? ({ \
unsigned char ret; \
asm volatile("lock incb %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : ({ \
void __unsupported_argument_size_for_pl_inc__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_inc__(__FILE__,__LINE__); \
0; \
}) \
)
/* decrement integer value pointed to by pointer <ptr>, and return non-zero if
* result is non-null.
*/
#define pl_dec(ptr) ( \
(sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \
unsigned char ret; \
asm volatile("lock decq %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 4) ? ({ \
unsigned char ret; \
asm volatile("lock decl %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 2) ? ({ \
unsigned char ret; \
asm volatile("lock decw %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 1) ? ({ \
unsigned char ret; \
asm volatile("lock decb %0\n" \
"setne %1\n" \
: "+m" (*(ptr)), "=qm" (ret) \
: \
: "cc"); \
ret; /* return value */ \
}) : ({ \
void __unsupported_argument_size_for_pl_dec__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_dec__(__FILE__,__LINE__); \
0; \
}) \
)
/* increment integer value pointed to by pointer <ptr>, no return */
#define pl_inc_noret(ptr) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock incq %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock incl %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock incw %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock incb %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_inc_noret__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_inc_noret__(__FILE__,__LINE__); \
} \
})
/* decrement integer value pointed to by pointer <ptr>, no return */
#define pl_dec_noret(ptr) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock decq %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock decl %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock decw %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock decb %0\n" \
: "+m" (*(ptr)) \
: \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_dec_noret__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_dec_noret__(__FILE__,__LINE__); \
} \
})
/* add integer constant <x> to integer value pointed to by pointer <ptr>,
* no return. Size of <x> is not checked.
*/
#define pl_add(ptr, x) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock addq %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned long)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock addl %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned int)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock addw %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned short)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock addb %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned char)(x)) \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_add__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_add__(__FILE__,__LINE__); \
} \
})
/* subtract integer constant <x> from integer value pointed to by pointer
* <ptr>, no return. Size of <x> is not checked.
*/
#define pl_sub(ptr, x) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock subq %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned long)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock subl %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned int)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock subw %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned short)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock subb %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned char)(x)) \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_sub__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_sub__(__FILE__,__LINE__); \
} \
})
/* binary and integer value pointed to by pointer <ptr> with constant <x>, no
* return. Size of <x> is not checked.
*/
#define pl_and(ptr, x) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock andq %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned long)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock andl %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned int)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock andw %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned short)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock andb %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned char)(x)) \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_and__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_and__(__FILE__,__LINE__); \
} \
})
/* binary or integer value pointed to by pointer <ptr> with constant <x>, no
* return. Size of <x> is not checked.
*/
#define pl_or(ptr, x) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock orq %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned long)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock orl %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned int)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock orw %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned short)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock orb %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned char)(x)) \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_or__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_or__(__FILE__,__LINE__); \
} \
})
/* binary xor integer value pointed to by pointer <ptr> with constant <x>, no
* return. Size of <x> is not checked.
*/
#define pl_xor(ptr, x) ({ \
if (sizeof(long) == 8 && sizeof(*(ptr)) == 8) { \
asm volatile("lock xorq %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned long)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 4) { \
asm volatile("lock xorl %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned int)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 2) { \
asm volatile("lock xorw %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned short)(x)) \
: "cc"); \
} else if (sizeof(*(ptr)) == 1) { \
asm volatile("lock xorb %1, %0\n" \
: "+m" (*(ptr)) \
: "er" ((unsigned char)(x)) \
: "cc"); \
} else { \
void __unsupported_argument_size_for_pl_xor__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_xor__(__FILE__,__LINE__); \
} \
})
/* test and set bit <bit> in integer value pointed to by pointer <ptr>. Returns
* 0 if the bit was not set, or ~0 of the same type as *ptr if it was set. Note
* that there is no 8-bit equivalent operation.
*/
#define pl_bts(ptr, bit) ( \
(sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \
unsigned long ret; \
asm volatile("lock btsq %2, %0\n\t" \
"sbb %1, %1\n\t" \
: "+m" (*(ptr)), "=r" (ret) \
: "Ir" ((unsigned long)(bit)) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 4) ? ({ \
unsigned int ret; \
asm volatile("lock btsl %2, %0\n\t" \
"sbb %1, %1\n\t" \
: "+m" (*(ptr)), "=r" (ret) \
: "Ir" ((unsigned int)(bit)) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 2) ? ({ \
unsigned short ret; \
asm volatile("lock btsw %2, %0\n\t" \
"sbb %1, %1\n\t" \
: "+m" (*(ptr)), "=r" (ret) \
: "Ir" ((unsigned short)(bit)) \
: "cc"); \
ret; /* return value */ \
}) : ({ \
void __unsupported_argument_size_for_pl_bts__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_bts__(__FILE__,__LINE__); \
0; \
}) \
)
/* Note: for an unclear reason, gcc's __sync_fetch_and_add() implementation
* produces less optimal than hand-crafted asm code so let's implement here the
* operations we need for the most common archs.
*/
/* fetch-and-add: fetch integer value pointed to by pointer <ptr>, add <x> to
* to <*ptr> and return the previous value.
*/
#define pl_xadd(ptr, x) ( \
(sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \
unsigned long ret = (unsigned long)(x); \
asm volatile("lock xaddq %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 4) ? ({ \
unsigned int ret = (unsigned int)(x); \
asm volatile("lock xaddl %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 2) ? ({ \
unsigned short ret = (unsigned short)(x); \
asm volatile("lock xaddw %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 1) ? ({ \
unsigned char ret = (unsigned char)(x); \
asm volatile("lock xaddb %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : ({ \
void __unsupported_argument_size_for_pl_xadd__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_xadd__(__FILE__,__LINE__); \
0; \
}) \
)
/* exchange value <x> with integer value pointed to by pointer <ptr>, and return
* previous <*ptr> value. <x> must be of the same size as <*ptr>.
*/
#define pl_xchg(ptr, x) ( \
(sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \
unsigned long ret = (unsigned long)(x); \
asm volatile("xchgq %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 4) ? ({ \
unsigned int ret = (unsigned int)(x); \
asm volatile("xchgl %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 2) ? ({ \
unsigned short ret = (unsigned short)(x); \
asm volatile("xchgw %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 1) ? ({ \
unsigned char ret = (unsigned char)(x); \
asm volatile("xchgb %0, %1\n" \
: "=r" (ret), "+m" (*(ptr)) \
: "0" (ret) \
: "cc"); \
ret; /* return value */ \
}) : ({ \
void __unsupported_argument_size_for_pl_xchg__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_xchg__(__FILE__,__LINE__); \
0; \
}) \
)
/* compare integer value <*ptr> with <old> and exchange it with <new> if
* it matches, and return <old>. <old> and <new> must be of the same size as
* <*ptr>.
*/
#define pl_cmpxchg(ptr, old, new) ( \
(sizeof(long) == 8 && sizeof(*(ptr)) == 8) ? ({ \
unsigned long ret; \
asm volatile("lock cmpxchgq %2,%1" \
: "=a" (ret), "+m" (*(ptr)) \
: "r" ((unsigned long)(new)), \
"0" ((unsigned long)(old)) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 4) ? ({ \
unsigned int ret; \
asm volatile("lock cmpxchgl %2,%1" \
: "=a" (ret), "+m" (*(ptr)) \
: "r" ((unsigned int)(new)), \
"0" ((unsigned int)(old)) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 2) ? ({ \
unsigned short ret; \
asm volatile("lock cmpxchgw %2,%1" \
: "=a" (ret), "+m" (*(ptr)) \
: "r" ((unsigned short)(new)), \
"0" ((unsigned short)(old)) \
: "cc"); \
ret; /* return value */ \
}) : (sizeof(*(ptr)) == 1) ? ({ \
unsigned char ret; \
asm volatile("lock cmpxchgb %2,%1" \
: "=a" (ret), "+m" (*(ptr)) \
: "r" ((unsigned char)(new)), \
"0" ((unsigned char)(old)) \
: "cc"); \
ret; /* return value */ \
}) : ({ \
void __unsupported_argument_size_for_pl_cmpxchg__(char *,int); \
if (sizeof(*(ptr)) != 1 && sizeof(*(ptr)) != 2 && \
sizeof(*(ptr)) != 4 && (sizeof(long) != 8 || sizeof(*(ptr)) != 8)) \
__unsupported_argument_size_for_pl_cmpxchg__(__FILE__,__LINE__); \
0; \
}) \
)
#else
/* generic implementations */
#if defined(__aarch64__)
/* This was shown to improve fairness on modern ARMv8 such as Neoverse N1 */
#define pl_cpu_relax() do { \
asm volatile("isb" ::: "memory"); \
} while (0)
#else
#define pl_cpu_relax() do { \
asm volatile(""); \
} while (0)
#endif
/* full memory barrier */
#define pl_mb() do { \
__sync_synchronize(); \
} while (0)
#define pl_inc_noret(ptr) ({ __sync_add_and_fetch((ptr), 1); })
#define pl_dec_noret(ptr) ({ __sync_sub_and_fetch((ptr), 1); })
#define pl_inc(ptr) ({ __sync_add_and_fetch((ptr), 1); })
#define pl_dec(ptr) ({ __sync_sub_and_fetch((ptr), 1); })
#define pl_add(ptr, x) ({ __sync_add_and_fetch((ptr), (x)); })
#define pl_and(ptr, x) ({ __sync_and_and_fetch((ptr), (x)); })
#define pl_or(ptr, x) ({ __sync_or_and_fetch((ptr), (x)); })
#define pl_xor(ptr, x) ({ __sync_xor_and_fetch((ptr), (x)); })
#define pl_sub(ptr, x) ({ __sync_sub_and_fetch((ptr), (x)); })
#define pl_bts(ptr, bit) ({ typeof(*(ptr)) __pl_t = (1u << (bit)); \
__sync_fetch_and_or((ptr), __pl_t) & __pl_t; \
})
#define pl_xadd(ptr, x) ({ __sync_fetch_and_add((ptr), (x)); })
#define pl_cmpxchg(ptr, o, n) ({ __sync_val_compare_and_swap((ptr), (o), (n)); })
#define pl_xchg(ptr, x) ({ typeof(*(ptr)) __pl_t; \
do { __pl_t = *(ptr); \
} while (!__sync_bool_compare_and_swap((ptr), __pl_t, (x))); \
__pl_t; \
})
#endif
#endif /* PL_ATOMIC_OPS_H */
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