1 /* Copyright (C) 2005-2023 Free Software Foundation, Inc.
2
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _TLS_H
20 # define _TLS_H 1
21
22 # include <dl-sysdep.h>
23
24 #ifndef __ASSEMBLER__
25 # include <stdbool.h>
26 # include <stddef.h>
27 # include <stdint.h>
28 # include <dl-dtv.h>
29 #endif /* __ASSEMBLER__ */
30
31 #ifndef __ASSEMBLER__
32
33 /* Get system call information. */
34 # include <sysdep.h>
35
36 /* The TP points to the start of the thread blocks. */
37 # define TLS_DTV_AT_TP 1
38 # define TLS_TCB_AT_TP 0
39
40 /* Get the thread descriptor definition. */
41 # include <nptl/descr.h>
42
43 typedef struct
44 {
45 dtv_t *dtv;
46 void *private;
47 } tcbhead_t;
48
49 #define READ_THREAD_POINTER() \
50 ({ register void *__microblaze_thread_area asm ("r21"); \
51 __microblaze_thread_area; })
52
53 /* This is the size of the initial TCB. */
54 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
55
56 /* This is the size of the TCB. */
57 # define TLS_TCB_SIZE sizeof (tcbhead_t)
58
59 /* This is the size we need before TCB. */
60 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
61
62 /* Install the dtv pointer. The pointer passed is to the element with
63 index -1 which contain the length. */
64 # define INSTALL_DTV(tcbp, dtvp) \
65 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
66
67 /* Install new dtv for current thread. */
68 # define INSTALL_NEW_DTV(dtv) \
69 (THREAD_DTV() = (dtv))
70
71 /* Return dtv of given thread descriptor. */
72 # define GET_DTV(tcbp) \
73 (((tcbhead_t *) (tcbp))->dtv)
74
75 /* Code to initially initialize the thread pointer.
76 r21 is reserved for thread pointer. */
77 # define TLS_INIT_TP(tcbp) \
78 ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); true; })
79
80 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
81
82 /* Return the address of the dtv for the current thread. */
83 # define THREAD_DTV() \
84 (((tcbhead_t *) READ_THREAD_POINTER())->dtv)
85
86 /* Return the thread descriptor for the current thread. */
87 # define THREAD_SELF \
88 (((struct pthread *) READ_THREAD_POINTER()) - 1)
89
90 /* Magic for libthread_db to know how to do THREAD_SELF. */
91 # define DB_THREAD_SELF \
92 CONST_THREAD_AREA (32, sizeof (struct pthread))
93
94 # include <tcb-access.h>
95
96 /* Get and set the global scope generation counter in struct pthread. */
97 # define THREAD_GSCOPE_FLAG_UNUSED 0
98 # define THREAD_GSCOPE_FLAG_USED 1
99 # define THREAD_GSCOPE_FLAG_WAIT 2
100 # define THREAD_GSCOPE_RESET_FLAG() \
101 do \
102 { int __res \
103 = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \
104 THREAD_GSCOPE_FLAG_UNUSED); \
105 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
106 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
107 } \
108 while (0)
109 # define THREAD_GSCOPE_SET_FLAG() \
110 do \
111 { \
112 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
113 atomic_write_barrier (); \
114 } \
115 while (0)
116
117 #endif /* __ASSEMBLER__ */
118
119 #endif /* tls.h. */