pthread_md.h revision 319430 
1/*-
2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
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, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/11/lib/libthr/arch/arm/include/pthread_md.h 319430 2017-06-01 14:49:53Z vangyzen $
27 */
28
29/*
30 * Machine-dependent thread prototypes/definitions.
31 */
32#ifndef _PTHREAD_MD_H_
33#define	_PTHREAD_MD_H_
34
35#include <sys/types.h>
36#include <machine/sysarch.h>
37#include <stddef.h>
38
39#define	CPU_SPINWAIT
40#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
41
42/*
43 * Variant II tcb, first two members are required by rtld.
44 */
45struct tcb {
46	void			*tcb_dtv;	/* required by rtld */
47	struct pthread		*tcb_thread;	/* our hook */
48};
49
50/* Called from the thread to set its private data. */
51static __inline void
52_tcb_set(struct tcb *tcb)
53{
54#ifdef ARM_TP_ADDRESS
55	*((struct tcb **)ARM_TP_ADDRESS) = tcb;	/* avoids a system call */
56#else
57	sysarch(ARM_SET_TP, tcb);
58#endif
59}
60
61/*
62 * Get the current tcb.
63 */
64static __inline struct tcb *
65_tcb_get(void)
66{
67#ifdef ARM_TP_ADDRESS
68	return (*((struct tcb **)ARM_TP_ADDRESS));
69#else
70	struct tcb *tcb;
71
72	__asm __volatile("mrc  p15, 0, %0, c13, c0, 3"		\
73	   		 : "=r" (tcb));
74	return (tcb);
75#endif
76}
77
78static __inline struct pthread *
79_get_curthread(void)
80{
81	if (_thr_initial)
82		return (_tcb_get()->tcb_thread);
83	return (NULL);
84}
85
86#endif /* _PTHREAD_MD_H_ */
87