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  * $FreeBSD$
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  */
48 struct 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" (*(volatile u_long *)(__tcb_offset(name))));  \
75 	__result = (__tcb_type(name))__i;			\
76 								\
77 	__result;						\
78 })
79 
80 static __inline void
81 _tcb_set(struct tcb *tcb)
82 {
83 	amd64_set_fsbase(tcb);
84 }
85 
86 static __inline struct tcb *
87 _tcb_get(void)
88 {
89 	return (TCB_GET64(tcb_self));
90 }
91 
92 static __inline struct pthread *
93 _get_curthread(void)
94 {
95 	return (TCB_GET64(tcb_thread));
96 }
97 
98 #define	HAS__UMTX_OP_ERR	1
99 
100 #endif
101