1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright 2004 by Peter Grehan. 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. 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 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * 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
41 #define CPU_SPINWAIT
42
43 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
44 #ifdef __powerpc64__
45 #define TP_OFFSET 0x7010
46 #else
47 #define TP_OFFSET 0x7008
48 #endif
49
50 /*
51 * Variant I tcb. The structure layout is fixed, don't blindly
52 * change it.
53 * %r2 (32-bit) or %r13 (64-bit) points to end of the structure.
54 */
55 struct tcb {
56 void *tcb_dtv;
57 struct pthread *tcb_thread;
58 };
59
60 static __inline void
_tcb_set(struct tcb * tcb)61 _tcb_set(struct tcb *tcb)
62 {
63 #ifdef __powerpc64__
64 __asm __volatile("mr 13,%0" ::
65 "r"((uint8_t *)tcb + TP_OFFSET));
66 #else
67 __asm __volatile("mr 2,%0" ::
68 "r"((uint8_t *)tcb + TP_OFFSET));
69 #endif
70 }
71
72 static __inline struct tcb *
_tcb_get(void)73 _tcb_get(void)
74 {
75 register struct tcb *tcb;
76
77 #ifdef __powerpc64__
78 __asm __volatile("addi %0,13,%1" : "=r"(tcb) : "i"(-TP_OFFSET));
79 #else
80 __asm __volatile("addi %0,2,%1" : "=r"(tcb) : "i"(-TP_OFFSET));
81 #endif
82
83 return (tcb);
84 }
85
86 static __inline struct pthread *
_get_curthread(void)87 _get_curthread(void)
88 {
89 if (_thr_initial)
90 return (_tcb_get()->tcb_thread);
91 return (NULL);
92 }
93
94 #define HAS__UMTX_OP_ERR 1
95
96 #endif /* _PTHREAD_MD_H_ */
97