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95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/* $NetBSD: pthread_md.h,v 1.20 2012/03/02 23:19:47 joerg Exp $ */
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/*-
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* Copyright (c) 2001, 2007, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams, and by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LIB_PTHREAD_I386_MD_H
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#define _LIB_PTHREAD_I386_MD_H
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#include <sys/ucontext.h>
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#include <ucontext.h>
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static inline unsigned long
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pthread__sp(void)
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{
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unsigned long ret;
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__asm("movl %%esp, %0" : "=g" (ret));
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return ret;
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}
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#define pthread__uc_sp(ucp) ((ucp)->uc_mcontext.__gregs[_REG_UESP])
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static inline void
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_initcontext_u_md(ucontext_t *ucp)
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{
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__asm ("pushfl; popl %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_EFL]));
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__asm ("pushl %%cs; popl %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_CS]));
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__asm ("movl %%ds, %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_DS]));
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__asm ("movl %%es, %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_ES]));
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__asm ("movl %%fs, %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_FS]));
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__asm ("movl %%gs, %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_GS]));
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__asm ("movl %%ss, %0" : "=a" (ucp->uc_mcontext.__gregs[_REG_SS]));
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}
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#define _INITCONTEXT_U_MD(ucp) _initcontext_u_md(ucp);
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#define pthread__smt_pause() __asm __volatile("rep; nop" ::: "memory")
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/* Don't need additional memory barriers. */
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#define PTHREAD__ATOMIC_IS_MEMBAR
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static inline void *
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_atomic_cas_ptr(volatile void *ptr, void *old, void *new)
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{
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volatile uintptr_t *cast = ptr;
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void *ret;
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__asm __volatile ("lock; cmpxchgl %2, %1"
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: "=a" (ret), "=m" (*cast)
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: "r" (new), "m" (*cast), "0" (old));
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return ret;
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}
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static inline void *
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_atomic_cas_ptr_ni(volatile void *ptr, void *old, void *new)
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{
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volatile uintptr_t *cast = ptr;
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void *ret;
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__asm __volatile ("cmpxchgl %2, %1"
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: "=a" (ret), "=m" (*cast)
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: "r" (new), "m" (*cast), "0" (old));
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return ret;
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}
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#endif /* _LIB_PTHREAD_I386_MD_H */
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