1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2003 David Xu <[email protected]>
5 * Copyright (c) 2001 Daniel Eischen <[email protected]>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Neither the name of the author nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 /*
33 * Machine-dependent thread prototypes/definitions.
34 */
35 #ifndef _PTHREAD_MD_H_
36 #define _PTHREAD_MD_H_
37
38 #include <stddef.h>
39 #include <sys/types.h>
40 #include <machine/sysarch.h>
41
42 #define CPU_SPINWAIT __asm __volatile("pause")
43
44 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
45
46 /*
47 * Variant II tcb, first two members are required by rtld,
48 * %fs points to the structure.
49 */
50 struct tcb {
51 struct tcb *tcb_self; /* required by rtld */
52 void *tcb_dtv; /* required by rtld */
53 struct pthread *tcb_thread;
54 void *tcb_spare[1];
55 };
56
57 /*
58 * Evaluates to the byte offset of the per-tcb variable name.
59 */
60 #define __tcb_offset(name) __offsetof(struct tcb, name)
61
62 /*
63 * Evaluates to the type of the per-tcb variable name.
64 */
65 #define __tcb_type(name) __typeof(((struct tcb *)0)->name)
66
67 /*
68 * Evaluates to the value of the per-tcb variable name.
69 */
70 #define TCB_GET64(name) ({ \
71 __tcb_type(name) __result; \
72 \
73 u_long __i; \
74 __asm __volatile("movq %%fs:%1, %0" \
75 : "=r" (__i) \
76 : "m" (*(volatile u_long *)(__tcb_offset(name)))); \
77 __result = (__tcb_type(name))__i; \
78 \
79 __result; \
80 })
81
82 static __inline void
_tcb_set(struct tcb * tcb)83 _tcb_set(struct tcb *tcb)
84 {
85 amd64_set_fsbase(tcb);
86 }
87
88 static __inline struct tcb *
_tcb_get(void)89 _tcb_get(void)
90 {
91 return (TCB_GET64(tcb_self));
92 }
93
94 static __inline struct pthread *
_get_curthread(void)95 _get_curthread(void)
96 {
97 return (TCB_GET64(tcb_thread));
98 }
99
100 #define HAS__UMTX_OP_ERR 1
101
102 #endif
103