pthread_md.h revision 331722 
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 331722 2018-03-29 02:50:57Z eadler $
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 I tcb. The structure layout is fixed, don't blindly
44 * change it.
45 */
46struct tcb {
47	void			*tcb_dtv;	/* required by rtld */
48	struct pthread		*tcb_thread;	/* our hook */
49};
50
51/* Called from the thread to set its private data. */
52static __inline void
53_tcb_set(struct tcb *tcb)
54{
55#ifdef ARM_TP_ADDRESS
56	*((struct tcb **)ARM_TP_ADDRESS) = tcb;	/* avoids a system call */
57#else
58	sysarch(ARM_SET_TP, tcb);
59#endif
60}
61
62/*
63 * Get the current tcb.
64 */
65static __inline struct tcb *
66_tcb_get(void)
67{
68#ifdef ARM_TP_ADDRESS
69	return (*((struct tcb **)ARM_TP_ADDRESS));
70#else
71	struct tcb *tcb;
72
73	__asm __volatile("mrc  p15, 0, %0, c13, c0, 3"		\
74	   		 : "=r" (tcb));
75	return (tcb);
76#endif
77}
78
79static __inline struct pthread *
80_get_curthread(void)
81{
82	if (_thr_initial)
83		return (_tcb_get()->tcb_thread);
84	return (NULL);
85}
86
87#endif /* _PTHREAD_MD_H_ */
88