forked from Minki/linux
alpha: xchg/cmpxchg cleanup and fixes
- "_local" versions of xchg/cmpxchg functions duplicate code of non-local ones (quite a few pages of assembler), except memory barriers. We can generate these two variants from a single header file using simple macros; - convert xchg macro back to inline function using always_inline attribute; - use proper argument types for cmpxchg_u8/u16 functions to fix a problem with negative arguments. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ivan Kokshaysky
Linus Torvalds
parent
a94066992b
commit
a6209d6d71
@ -309,519 +309,72 @@ extern int __min_ipl;
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#define tbia() __tbi(-2, /* no second argument */)
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/*
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* Atomic exchange.
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* Since it can be used to implement critical sections
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* it must clobber "memory" (also for interrupts in UP).
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* Atomic exchange routines.
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*/
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static inline unsigned long
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__xchg_u8(volatile char *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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#define __ASM__MB
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#define ____xchg(type, args...) __xchg ## type ## _local(args)
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#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args)
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#include <asm/xchg.h>
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
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" insbl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
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" extbl %2,%4,%0\n"
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" mskbl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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__xchg_u16(volatile short *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
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" inswl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
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" extwl %2,%4,%0\n"
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" mskwl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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__xchg_u32(volatile int *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ldl_l %0,%4\n"
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" bis $31,%3,%1\n"
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" stl_c %1,%2\n"
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" beq %1,2f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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static inline unsigned long
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__xchg_u64(volatile long *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ldq_l %0,%4\n"
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" bis $31,%3,%1\n"
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" stq_c %1,%2\n"
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" beq %1,2f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid xchg(). */
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extern void __xchg_called_with_bad_pointer(void);
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#define __xchg(ptr, x, size) \
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({ \
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unsigned long __xchg__res; \
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volatile void *__xchg__ptr = (ptr); \
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switch (size) { \
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case 1: __xchg__res = __xchg_u8(__xchg__ptr, x); break; \
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case 2: __xchg__res = __xchg_u16(__xchg__ptr, x); break; \
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case 4: __xchg__res = __xchg_u32(__xchg__ptr, x); break; \
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case 8: __xchg__res = __xchg_u64(__xchg__ptr, x); break; \
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default: __xchg_called_with_bad_pointer(); __xchg__res = x; \
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} \
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__xchg__res; \
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})
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#define xchg(ptr,x) \
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({ \
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__typeof__(*(ptr)) _x_ = (x); \
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(__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
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#define xchg_local(ptr,x) \
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({ \
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__typeof__(*(ptr)) _x_ = (x); \
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(__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \
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sizeof(*(ptr))); \
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})
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static inline unsigned long
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__xchg_u8_local(volatile char *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
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" insbl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
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" extbl %2,%4,%0\n"
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" mskbl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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__xchg_u16_local(volatile short *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
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" inswl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
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" extwl %2,%4,%0\n"
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" mskwl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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__xchg_u32_local(volatile int *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ldl_l %0,%4\n"
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" bis $31,%3,%1\n"
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" stl_c %1,%2\n"
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" beq %1,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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static inline unsigned long
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__xchg_u64_local(volatile long *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ldq_l %0,%4\n"
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" bis $31,%3,%1\n"
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" stq_c %1,%2\n"
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" beq %1,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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#define __xchg_local(ptr, x, size) \
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({ \
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unsigned long __xchg__res; \
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volatile void *__xchg__ptr = (ptr); \
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switch (size) { \
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case 1: __xchg__res = __xchg_u8_local(__xchg__ptr, x); break; \
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case 2: __xchg__res = __xchg_u16_local(__xchg__ptr, x); break; \
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case 4: __xchg__res = __xchg_u32_local(__xchg__ptr, x); break; \
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case 8: __xchg__res = __xchg_u64_local(__xchg__ptr, x); break; \
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default: __xchg_called_with_bad_pointer(); __xchg__res = x; \
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} \
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__xchg__res; \
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})
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#define xchg_local(ptr,x) \
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({ \
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__typeof__(*(ptr)) _x_ = (x); \
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(__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \
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sizeof(*(ptr))); \
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#define cmpxchg_local(ptr, o, n) \
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({ \
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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(__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, \
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sizeof(*(ptr))); \
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})
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/*
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* Atomic compare and exchange. Compare OLD with MEM, if identical,
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* store NEW in MEM. Return the initial value in MEM. Success is
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* indicated by comparing RETURN with OLD.
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*
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* The memory barrier should be placed in SMP only when we actually
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* make the change. If we don't change anything (so if the returned
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* prev is equal to old) then we aren't acquiring anything new and
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* we don't need any memory barrier as far I can tell.
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*/
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#define cmpxchg64_local(ptr, o, n) \
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({ \
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BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
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cmpxchg_local((ptr), (o), (n)); \
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})
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#ifdef CONFIG_SMP
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#undef __ASM__MB
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#define __ASM__MB "\tmb\n"
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#endif
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#undef ____xchg
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#undef ____cmpxchg
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#define ____xchg(type, args...) __xchg ##type(args)
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#define ____cmpxchg(type, args...) __cmpxchg ##type(args)
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#include <asm/xchg.h>
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#define xchg(ptr,x) \
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({ \
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__typeof__(*(ptr)) _x_ = (x); \
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(__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, \
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sizeof(*(ptr))); \
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})
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#define cmpxchg(ptr, o, n) \
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({ \
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, sizeof(*(ptr)));\
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})
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#define cmpxchg64(ptr, o, n) \
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({ \
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BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
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cmpxchg((ptr), (o), (n)); \
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})
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#undef __ASM__MB
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#undef ____cmpxchg
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#define __HAVE_ARCH_CMPXCHG 1
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static inline unsigned long
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__cmpxchg_u8(volatile char *m, long old, long new)
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{
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unsigned long prev, tmp, cmp, addr64;
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__asm__ __volatile__(
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" andnot %5,7,%4\n"
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" insbl %1,%5,%1\n"
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"1: ldq_l %2,0(%4)\n"
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" extbl %2,%5,%0\n"
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" cmpeq %0,%6,%3\n"
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" beq %3,2f\n"
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" mskbl %2,%5,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%4)\n"
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" beq %2,3f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
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: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
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return prev;
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}
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static inline unsigned long
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__cmpxchg_u16(volatile short *m, long old, long new)
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{
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unsigned long prev, tmp, cmp, addr64;
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__asm__ __volatile__(
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" andnot %5,7,%4\n"
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" inswl %1,%5,%1\n"
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"1: ldq_l %2,0(%4)\n"
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" extwl %2,%5,%0\n"
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" cmpeq %0,%6,%3\n"
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" beq %3,2f\n"
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" mskwl %2,%5,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%4)\n"
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" beq %2,3f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
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: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
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return prev;
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}
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static inline unsigned long
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__cmpxchg_u32(volatile int *m, int old, int new)
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{
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unsigned long prev, cmp;
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__asm__ __volatile__(
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"1: ldl_l %0,%5\n"
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" cmpeq %0,%3,%1\n"
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" beq %1,2f\n"
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" mov %4,%1\n"
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" stl_c %1,%2\n"
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" beq %1,3f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r"(prev), "=&r"(cmp), "=m"(*m)
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: "r"((long) old), "r"(new), "m"(*m) : "memory");
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return prev;
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}
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static inline unsigned long
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__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
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{
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unsigned long prev, cmp;
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__asm__ __volatile__(
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"1: ldq_l %0,%5\n"
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" cmpeq %0,%3,%1\n"
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" beq %1,2f\n"
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" mov %4,%1\n"
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" stq_c %1,%2\n"
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" beq %1,3f\n"
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#ifdef CONFIG_SMP
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" mb\n"
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#endif
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r"(prev), "=&r"(cmp), "=m"(*m)
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: "r"((long) old), "r"(new), "m"(*m) : "memory");
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return prev;
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}
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid cmpxchg(). */
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extern void __cmpxchg_called_with_bad_pointer(void);
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static __always_inline unsigned long
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__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
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{
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switch (size) {
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case 1:
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return __cmpxchg_u8(ptr, old, new);
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case 2:
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return __cmpxchg_u16(ptr, old, new);
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case 4:
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return __cmpxchg_u32(ptr, old, new);
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case 8:
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return __cmpxchg_u64(ptr, old, new);
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}
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__cmpxchg_called_with_bad_pointer();
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return old;
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}
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#define cmpxchg(ptr, o, n) \
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({ \
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, sizeof(*(ptr))); \
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})
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#define cmpxchg64(ptr, o, n) \
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({ \
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BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
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cmpxchg((ptr), (o), (n)); \
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})
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static inline unsigned long
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__cmpxchg_u8_local(volatile char *m, long old, long new)
|
||||
{
|
||||
unsigned long prev, tmp, cmp, addr64;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" andnot %5,7,%4\n"
|
||||
" insbl %1,%5,%1\n"
|
||||
"1: ldq_l %2,0(%4)\n"
|
||||
" extbl %2,%5,%0\n"
|
||||
" cmpeq %0,%6,%3\n"
|
||||
" beq %3,2f\n"
|
||||
" mskbl %2,%5,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%4)\n"
|
||||
" beq %2,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
__cmpxchg_u16_local(volatile short *m, long old, long new)
|
||||
{
|
||||
unsigned long prev, tmp, cmp, addr64;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" andnot %5,7,%4\n"
|
||||
" inswl %1,%5,%1\n"
|
||||
"1: ldq_l %2,0(%4)\n"
|
||||
" extwl %2,%5,%0\n"
|
||||
" cmpeq %0,%6,%3\n"
|
||||
" beq %3,2f\n"
|
||||
" mskwl %2,%5,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%4)\n"
|
||||
" beq %2,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
__cmpxchg_u32_local(volatile int *m, int old, int new)
|
||||
{
|
||||
unsigned long prev, cmp;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldl_l %0,%5\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stl_c %1,%2\n"
|
||||
" beq %1,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r"(prev), "=&r"(cmp), "=m"(*m)
|
||||
: "r"((long) old), "r"(new), "m"(*m) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
__cmpxchg_u64_local(volatile long *m, unsigned long old, unsigned long new)
|
||||
{
|
||||
unsigned long prev, cmp;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldq_l %0,%5\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stq_c %1,%2\n"
|
||||
" beq %1,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r"(prev), "=&r"(cmp), "=m"(*m)
|
||||
: "r"((long) old), "r"(new), "m"(*m) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static __always_inline unsigned long
|
||||
__cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
|
||||
int size)
|
||||
{
|
||||
switch (size) {
|
||||
case 1:
|
||||
return __cmpxchg_u8_local(ptr, old, new);
|
||||
case 2:
|
||||
return __cmpxchg_u16_local(ptr, old, new);
|
||||
case 4:
|
||||
return __cmpxchg_u32_local(ptr, old, new);
|
||||
case 8:
|
||||
return __cmpxchg_u64_local(ptr, old, new);
|
||||
}
|
||||
__cmpxchg_called_with_bad_pointer();
|
||||
return old;
|
||||
}
|
||||
|
||||
#define cmpxchg_local(ptr, o, n) \
|
||||
({ \
|
||||
__typeof__(*(ptr)) _o_ = (o); \
|
||||
__typeof__(*(ptr)) _n_ = (n); \
|
||||
(__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
|
||||
(unsigned long)_n_, sizeof(*(ptr))); \
|
||||
})
|
||||
#define cmpxchg64_local(ptr, o, n) \
|
||||
({ \
|
||||
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
||||
cmpxchg_local((ptr), (o), (n)); \
|
||||
})
|
||||
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
|
||||
#define arch_align_stack(x) (x)
|
||||
|
||||
258
arch/alpha/include/asm/xchg.h
Normal file
258
arch/alpha/include/asm/xchg.h
Normal file
@ -0,0 +1,258 @@
|
||||
#ifndef __ALPHA_SYSTEM_H
|
||||
#error Do not include xchg.h directly!
|
||||
#else
|
||||
/*
|
||||
* xchg/xchg_local and cmpxchg/cmpxchg_local share the same code
|
||||
* except that local version do not have the expensive memory barrier.
|
||||
* So this file is included twice from asm/system.h.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Atomic exchange.
|
||||
* Since it can be used to implement critical sections
|
||||
* it must clobber "memory" (also for interrupts in UP).
|
||||
*/
|
||||
|
||||
static inline unsigned long
|
||||
____xchg(_u8, volatile char *m, unsigned long val)
|
||||
{
|
||||
unsigned long ret, tmp, addr64;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" andnot %4,7,%3\n"
|
||||
" insbl %1,%4,%1\n"
|
||||
"1: ldq_l %2,0(%3)\n"
|
||||
" extbl %2,%4,%0\n"
|
||||
" mskbl %2,%4,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%3)\n"
|
||||
" beq %2,2f\n"
|
||||
__ASM__MB
|
||||
".subsection 2\n"
|
||||
"2: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "1" (val) : "memory");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____xchg(_u16, volatile short *m, unsigned long val)
|
||||
{
|
||||
unsigned long ret, tmp, addr64;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" andnot %4,7,%3\n"
|
||||
" inswl %1,%4,%1\n"
|
||||
"1: ldq_l %2,0(%3)\n"
|
||||
" extwl %2,%4,%0\n"
|
||||
" mskwl %2,%4,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%3)\n"
|
||||
" beq %2,2f\n"
|
||||
__ASM__MB
|
||||
".subsection 2\n"
|
||||
"2: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "1" (val) : "memory");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____xchg(_u32, volatile int *m, unsigned long val)
|
||||
{
|
||||
unsigned long dummy;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldl_l %0,%4\n"
|
||||
" bis $31,%3,%1\n"
|
||||
" stl_c %1,%2\n"
|
||||
" beq %1,2f\n"
|
||||
__ASM__MB
|
||||
".subsection 2\n"
|
||||
"2: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (val), "=&r" (dummy), "=m" (*m)
|
||||
: "rI" (val), "m" (*m) : "memory");
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____xchg(_u64, volatile long *m, unsigned long val)
|
||||
{
|
||||
unsigned long dummy;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldq_l %0,%4\n"
|
||||
" bis $31,%3,%1\n"
|
||||
" stq_c %1,%2\n"
|
||||
" beq %1,2f\n"
|
||||
__ASM__MB
|
||||
".subsection 2\n"
|
||||
"2: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (val), "=&r" (dummy), "=m" (*m)
|
||||
: "rI" (val), "m" (*m) : "memory");
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
/* This function doesn't exist, so you'll get a linker error
|
||||
if something tries to do an invalid xchg(). */
|
||||
extern void __xchg_called_with_bad_pointer(void);
|
||||
|
||||
static __always_inline unsigned long
|
||||
____xchg(, volatile void *ptr, unsigned long x, int size)
|
||||
{
|
||||
switch (size) {
|
||||
case 1:
|
||||
return ____xchg(_u8, ptr, x);
|
||||
case 2:
|
||||
return ____xchg(_u16, ptr, x);
|
||||
case 4:
|
||||
return ____xchg(_u32, ptr, x);
|
||||
case 8:
|
||||
return ____xchg(_u64, ptr, x);
|
||||
}
|
||||
__xchg_called_with_bad_pointer();
|
||||
return x;
|
||||
}
|
||||
|
||||
/*
|
||||
* Atomic compare and exchange. Compare OLD with MEM, if identical,
|
||||
* store NEW in MEM. Return the initial value in MEM. Success is
|
||||
* indicated by comparing RETURN with OLD.
|
||||
*
|
||||
* The memory barrier should be placed in SMP only when we actually
|
||||
* make the change. If we don't change anything (so if the returned
|
||||
* prev is equal to old) then we aren't acquiring anything new and
|
||||
* we don't need any memory barrier as far I can tell.
|
||||
*/
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u8, volatile char *m, unsigned char old, unsigned char new)
|
||||
{
|
||||
unsigned long prev, tmp, cmp, addr64;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" andnot %5,7,%4\n"
|
||||
" insbl %1,%5,%1\n"
|
||||
"1: ldq_l %2,0(%4)\n"
|
||||
" extbl %2,%5,%0\n"
|
||||
" cmpeq %0,%6,%3\n"
|
||||
" beq %3,2f\n"
|
||||
" mskbl %2,%5,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%4)\n"
|
||||
" beq %2,3f\n"
|
||||
__ASM__MB
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u16, volatile short *m, unsigned short old, unsigned short new)
|
||||
{
|
||||
unsigned long prev, tmp, cmp, addr64;
|
||||
|
||||
__asm__ __volatile__(
|
||||
" andnot %5,7,%4\n"
|
||||
" inswl %1,%5,%1\n"
|
||||
"1: ldq_l %2,0(%4)\n"
|
||||
" extwl %2,%5,%0\n"
|
||||
" cmpeq %0,%6,%3\n"
|
||||
" beq %3,2f\n"
|
||||
" mskwl %2,%5,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%4)\n"
|
||||
" beq %2,3f\n"
|
||||
__ASM__MB
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u32, volatile int *m, int old, int new)
|
||||
{
|
||||
unsigned long prev, cmp;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldl_l %0,%5\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stl_c %1,%2\n"
|
||||
" beq %1,3f\n"
|
||||
__ASM__MB
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r"(prev), "=&r"(cmp), "=m"(*m)
|
||||
: "r"((long) old), "r"(new), "m"(*m) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u64, volatile long *m, unsigned long old, unsigned long new)
|
||||
{
|
||||
unsigned long prev, cmp;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldq_l %0,%5\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stq_c %1,%2\n"
|
||||
" beq %1,3f\n"
|
||||
__ASM__MB
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r"(prev), "=&r"(cmp), "=m"(*m)
|
||||
: "r"((long) old), "r"(new), "m"(*m) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
/* This function doesn't exist, so you'll get a linker error
|
||||
if something tries to do an invalid cmpxchg(). */
|
||||
extern void __cmpxchg_called_with_bad_pointer(void);
|
||||
|
||||
static __always_inline unsigned long
|
||||
____cmpxchg(, volatile void *ptr, unsigned long old, unsigned long new,
|
||||
int size)
|
||||
{
|
||||
switch (size) {
|
||||
case 1:
|
||||
return ____cmpxchg(_u8, ptr, old, new);
|
||||
case 2:
|
||||
return ____cmpxchg(_u16, ptr, old, new);
|
||||
case 4:
|
||||
return ____cmpxchg(_u32, ptr, old, new);
|
||||
case 8:
|
||||
return ____cmpxchg(_u64, ptr, old, new);
|
||||
}
|
||||
__cmpxchg_called_with_bad_pointer();
|
||||
return old;
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user