1 /*-
2 * Copyright (c) 2005 David Xu <[email protected]>
3 * Copyright (c) 2015 Ruslan Bukin <[email protected]>
4 * All rights reserved.
5 *
6 * Portions of this software were developed by SRI International and the
7 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
8 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
9 *
10 * Portions of this software were developed by the University of Cambridge
11 * Computer Laboratory as part of the CTSRD Project, with support from the
12 * UK Higher Education Innovation Fund (HEIF).
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD$
36 */
37
38 /*
39 * Machine-dependent thread prototypes/definitions.
40 */
41 #ifndef _PTHREAD_MD_H_
42 #define _PTHREAD_MD_H_
43
44 #include <sys/types.h>
45 #include <stddef.h>
46
47 #define CPU_SPINWAIT
48 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
49 #define TP_OFFSET sizeof(struct tcb)
50
51 /*
52 * Variant I tcb. The structure layout is fixed, don't blindly
53 * change it!
54 */
55 struct tcb {
56 void *tcb_dtv;
57 struct pthread *tcb_thread;
58 };
59
60 /* Called from the thread to set its private data. */
61 static __inline void
_tcb_set(struct tcb * tcb)62 _tcb_set(struct tcb *tcb)
63 {
64
65 __asm __volatile("mv tp, %0" :: "r"((uint8_t *)tcb + TP_OFFSET));
66 }
67
68 /*
69 * Get the current tcb.
70 */
71 static __inline struct tcb *
_tcb_get(void)72 _tcb_get(void)
73 {
74 register uint8_t *_tp;
75
76 __asm __volatile("mv %0, tp" : "=r"(_tp));
77
78 return ((struct tcb *)(_tp - TP_OFFSET));
79 }
80
81 static __inline struct pthread *
_get_curthread(void)82 _get_curthread(void)
83 {
84
85 if (_thr_initial)
86 return (_tcb_get()->tcb_thread);
87 return (NULL);
88 }
89
90 #endif /* _PTHREAD_MD_H_ */
91