pthread_md.h revision 319430 
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: stable/11/lib/libthr/arch/powerpc/include/pthread_md.h 319430 2017-06-01 14:49:53Z vangyzen $
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	CPU_SPINWAIT
40
41#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
42#ifdef __powerpc64__
43#define	TP_OFFSET		0x7010
44#else
45#define	TP_OFFSET		0x7008
46#endif
47
48/*
49 * Variant I tcb. The structure layout is fixed, don't blindly
50 * change it.
51 * %r2 (32-bit) or %r13 (64-bit) points to end of the structure.
52 */
53struct tcb {
54	void			*tcb_dtv;
55	struct pthread		*tcb_thread;
56};
57
58static __inline void
59_tcb_set(struct tcb *tcb)
60{
61#ifdef __powerpc64__
62	__asm __volatile("mr 13,%0" ::
63	    "r"((uint8_t *)tcb + TP_OFFSET));
64#else
65	__asm __volatile("mr 2,%0" ::
66	    "r"((uint8_t *)tcb + TP_OFFSET));
67#endif
68}
69
70static __inline struct tcb *
71_tcb_get(void)
72{
73	register uint8_t *_tp;
74#ifdef __powerpc64__
75	__asm __volatile("mr %0,13" : "=r"(_tp));
76#else
77	__asm __volatile("mr %0,2" : "=r"(_tp));
78#endif
79
80	return ((struct tcb *)(_tp - TP_OFFSET));
81}
82
83static __inline struct pthread *
84_get_curthread(void)
85{
86	if (_thr_initial)
87		return (_tcb_get()->tcb_thread);
88	return (NULL);
89}
90
91#endif /* _PTHREAD_MD_H_ */
92