pthread_md.h revision 165241 
1/*-
2 * Copyright (C) 2003 David Xu <davidxu@freebsd.org>
3 * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Neither the name of the author nor the names of its contributors
12 *    may be used to endorse or promote products derived from this software
13 *    without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, 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/amd64/include/pthread_md.h 165241 2006-12-15 11:52:01Z davidxu $
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#include <machine/sysarch.h>
39
40#define	CPU_SPINWAIT		__asm __volatile("pause")
41
42#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
43
44/*
45 * Variant II tcb, first two members are required by rtld,
46 * %fs points to the structure.
47 */
48struct tcb {
49	struct tcb		*tcb_self;	/* required by rtld */
50	void			*tcb_dtv;	/* required by rtld */
51	struct pthread		*tcb_thread;
52	void			*tcb_spare[1];
53};
54
55/*
56 * Evaluates to the byte offset of the per-tcb variable name.
57 */
58#define	__tcb_offset(name)	__offsetof(struct tcb, name)
59
60/*
61 * Evaluates to the type of the per-tcb variable name.
62 */
63#define	__tcb_type(name)	__typeof(((struct tcb *)0)->name)
64
65/*
66 * Evaluates to the value of the per-tcb variable name.
67 */
68#define	TCB_GET64(name) ({					\
69	__tcb_type(name) __result;				\
70								\
71	u_long __i;						\
72	__asm __volatile("movq %%fs:%1, %0"			\
73	    : "=r" (__i)					\
74	    : "m" (*(u_long *)(__tcb_offset(name))));		\
75	__result = (__tcb_type(name))__i;			\
76								\
77	__result;						\
78})
79
80struct tcb	*_tcb_ctor(struct pthread *, int);
81void		_tcb_dtor(struct tcb *tcb);
82
83static __inline void
84_tcb_set(struct tcb *tcb)
85{
86	amd64_set_fsbase(tcb);
87}
88
89static __inline struct tcb *
90_tcb_get(void)
91{
92	return (TCB_GET64(tcb_self));
93}
94
95static __inline struct pthread *
96_get_curthread(void)
97{
98	return (TCB_GET64(tcb_thread));
99}
100#endif
101