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/*
* Copyright 2004 by Peter Grehan. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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>
#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
#define TLS_TP_OFFSET 0x7000
/*
* Variant I tcb. The structure layout is fixed, don't blindly
* change it.
* %r2 points to end of the structure.
*/
struct tcb {
void *tcb_dtv;
struct pthread *tcb_thread;
};
register uint8_t *_tp __asm("%r2");
#define _tcb ((struct tcb *)(_tp - TLS_TP_OFFSET - sizeof(struct tcb)))
struct tcb *_tcb_ctor(struct pthread *, int);
void _tcb_dtor(struct tcb *);
static __inline void
_tcb_set(struct tcb *tcb)
{
uint8_t *tp;
tp = (uint8_t *)tcb + TLS_TP_OFFSET + sizeof(struct tcb);
__asm __volatile("mr %0,%1" : "=r"(_tp) : "r"(tp));
}
static __inline struct tcb *
_tcb_get(void)
{
return (_tcb);
}
extern struct pthread *_thr_initial;
static __inline struct pthread *
_get_curthread(void)
{
if (_thr_initial)
return (_tcb->tcb_thread);
return (NULL);
}
#endif /* _PTHREAD_MD_H_ */
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