pthread_md.h revision 144518 
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: head/lib/libthr/arch/arm/include/pthread_md.h 144518 2005-04-02 01:20:00Z davidxu $
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#include <errno.h>
39
40static __inline int atomic_cmpset_32(volatile uint32_t *, uint32_t, uint32_t);
41
42#include <sys/umtx.h>
43
44#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
45
46/*
47 * Variant II tcb, first two members are required by rtld.
48 */
49struct tcb {
50	struct tcb              *tcb_self;	/* required by rtld */
51	void                    *tcb_dtv;	/* required by rtld */
52	struct pthread          *tcb_thread;	/* our hook */
53	void			*tcb_spare[1];
54};
55
56/*
57 * The tcb constructors.
58 */
59struct tcb	*_tcb_ctor(struct pthread *, int);
60void		_tcb_dtor(struct tcb *);
61
62/* Called from the thread to set its private data. */
63static __inline void
64_tcb_set(struct tcb *tcb)
65{
66	*((struct tcb **)ARM_TP_ADDRESS) = tcb;
67}
68
69/*
70 * Get the current tcb.
71 */
72static __inline struct tcb *
73_tcb_get(void)
74{
75	return (*((struct tcb **)ARM_TP_ADDRESS));
76}
77
78extern struct pthread *_thr_initial;
79
80static __inline struct pthread *
81_get_curthread(void)
82{
83	if (_thr_initial)
84		return (_tcb_get()->tcb_thread);
85	return (NULL);
86}
87
88extern struct umtx arm_umtx;
89
90static __inline int
91atomic_cmpset_32(volatile uint32_t *dst, uint32_t old, uint32_t newval)
92{
93	int ret;
94
95	_umtx_lock(&arm_umtx);
96	arm_umtx.u_owner = (void*)((uint32_t)arm_umtx.u_owner | UMTX_CONTESTED);
97	if (*dst == old) {
98		*dst = newval;
99		ret = 1;
100	} else
101		ret = 0;
102	_umtx_unlock(&arm_umtx);
103	return (ret);
104}
105
106#endif /* _PTHREAD_MD_H_ */
107