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/*-
* Copyright (c) 2002 Daniel Eischen <deischen@freebsd.org>.
* Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Machine-dependent thread prototypes/definitions.
*/
#ifndef _PTHREAD_MD_H_
#define _PTHREAD_MD_H_
#include <stddef.h>
#include <sys/types.h>
#include <machine/sysarch.h>
#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
extern int _thr_using_setbase;
/*
* Variant II tcb, first two members are required by rtld,
* %gs points to the structure.
*/
struct tcb {
struct tcb *tcb_self; /* required by rtld */
void *tcb_dtv; /* required by rtld */
struct pthread *tcb_thread;
};
/*
* Evaluates to the byte offset of the per-tcb variable name.
*/
#define __tcb_offset(name) __offsetof(struct tcb, name)
/*
* Evaluates to the type of the per-tcb variable name.
*/
#define __tcb_type(name) __typeof(((struct tcb *)0)->name)
/*
* Evaluates to the value of the per-tcb variable name.
*/
#define TCB_GET32(name) ({ \
__tcb_type(name) __result; \
\
u_int __i; \
__asm __volatile("movl %%gs:%1, %0" \
: "=r" (__i) \
: "m" (*(u_int *)(__tcb_offset(name)))); \
__result = (__tcb_type(name))__i; \
\
__result; \
})
/*
* The constructors.
*/
struct tcb *_tcb_ctor(struct pthread *, int);
void _tcb_dtor(struct tcb *tcb);
/* Called from the thread to set its private data. */
static __inline void
_tcb_set(struct tcb *tcb)
{
i386_set_gsbase(tcb);
}
/* Get the current kcb. */
static __inline struct tcb *
_tcb_get(void)
{
return (TCB_GET32(tcb_self));
}
extern struct pthread *_thr_initial;
/* Get the current thread. */
static __inline struct pthread *
_get_curthread(void)
{
if (_thr_initial)
return (TCB_GET32(tcb_thread));
return (NULL);
}
#endif
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