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Cheat and add inlines for _atomic_cas_ptr() to work around gcc emitting

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unneeded PIC stuff in mutex_lock() and mutex_unlock(), when a thread
register is used.
This commit is contained in:
ad 2008-03-22 17:59:12 +00:00
parent 5214147407
commit ecdd2c2965
2 changed files with 55 additions and 3 deletions
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30
lib/libpthread/arch/i386/pthread_md.h
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_md.h,v 1.12 2008/02/10 18:50:55 ad Exp $ */
/* $NetBSD: pthread_md.h,v 1.13 2008/03/22 17:59:12 ad Exp $ */
/*-
* Copyright (c) 2001, 2007, 2008 The NetBSD Foundation, Inc.
@ -182,7 +182,7 @@ pthread__sp(void)
} while (/*CONSTCOND*/0)
#define pthread__smt_pause() __asm __volatile("rep; nop" ::: "memory")
/* #define PTHREAD__HAVE_THREADREG */
/* #define PTHREAD__HAVE_THREADREG */
/* Don't need additional memory barriers. */
#define PTHREAD__ATOMIC_IS_MEMBAR
@ -201,4 +201,30 @@ pthread__threadreg_get(void)
return self;
}
static inline void *
_atomic_cas_ptr(volatile void *ptr, void *old, void *new)
{
volatile uintptr_t *cast = ptr;
void *ret;
__asm __volatile ("lock; cmpxchgl %2, %1"
: "=a" (ret), "=m" (*cast)
: "r" (new), "m" (*cast), "0" (old));
return ret;
}
static inline void *
_atomic_cas_ptr_ni(volatile void *ptr, void *old, void *new)
{
volatile uintptr_t *cast = ptr;
void *ret;
__asm __volatile ("cmpxchgl %2, %1"
: "=a" (ret), "=m" (*cast)
: "r" (new), "m" (*cast), "0" (old));
return ret;
}
#endif /* _LIB_PTHREAD_I386_MD_H */

28
lib/libpthread/arch/x86_64/pthread_md.h
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_md.h,v 1.8 2008/02/10 18:50:55 ad Exp $ */
/* $NetBSD: pthread_md.h,v 1.9 2008/03/22 17:59:12 ad Exp $ */
/*-
* Copyright (c) 2001, 2007, 2008 The NetBSD Foundation, Inc.
@ -108,4 +108,30 @@ pthread__sp(void)
/* Don't need additional memory barriers. */
#define PTHREAD__ATOMIC_IS_MEMBAR
static inline void *
_atomic_cas_ptr(volatile void *ptr, void *old, void *new)
{
volatile uintptr_t *cast = ptr;
void *ret;
__asm __volatile ("lock; cmpxchgq %2, %1"
: "=a" (ret), "=m" (*cast)
: "r" (new), "m" (*cast), "0" (old));
return ret;
}
static inline void *
_atomic_cas_ptr_ni(volatile void *ptr, void *old, void *new)
{
volatile uintptr_t *cast = ptr;
void *ret;
__asm __volatile ("cmpxchgq %2, %1"
: "=a" (ret), "=m" (*cast)
: "r" (new), "m" (*cast), "0" (old));
return ret;
}
#endif /* _LIB_PTHREAD_X86_64_MD_H */