pthread_md.h revision 161801 
1/*
2 * Copyright 2004 by Peter Grehan. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: head/lib/libthr/arch/powerpc/include/pthread_md.h 161801 2006-09-01 06:15:00Z marcel $
28 */
29
30/*
31 * Machine-dependent thread prototypes/definitions.
32 */
33#ifndef _PTHREAD_MD_H_
34#define	_PTHREAD_MD_H_
35
36#include <stddef.h>
37#include <sys/types.h>
38
39#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
40#define	TLS_TP_OFFSET		0x7008
41
42/*
43 * Variant I tcb. The structure layout is fixed, don't blindly
44 * change it.
45 * %r2 points to end of the structure.
46 */
47struct tcb {
48	void			*tcb_dtv;
49	struct pthread		*tcb_thread;
50};
51
52struct tcb	*_tcb_ctor(struct pthread *, int);
53void		_tcb_dtor(struct tcb *);
54
55static __inline void
56_tcb_set(struct tcb *tcb)
57{
58	register uint8_t *_tp __asm__("%r2");
59
60	__asm __volatile("mr %0,%1" : "=r"(_tp) :
61	    "r"((uint8_t *)tcb + TLS_TP_OFFSET));
62}
63
64static __inline struct tcb *
65_tcb_get(void)
66{
67	register uint8_t *_tp __asm__("%r2");
68
69	return ((struct tcb *)(_tp - TLS_TP_OFFSET));
70}
71
72extern struct pthread *_thr_initial;
73
74static __inline struct pthread *
75_get_curthread(void)
76{
77	if (_thr_initial)
78		return (_tcb_get()->tcb_thread);
79	return (NULL);
80}
81
82#endif /* _PTHREAD_MD_H_ */
83