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a54e8d33 | 1 | /* Definition for thread-local data handling. NPTL/SH version. |
2b778ceb | 2 | Copyright (C) 2003-2021 Free Software Foundation, Inc. |
a54e8d33 UD |
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 | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the 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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
a54e8d33 UD |
18 | |
19 | #ifndef _TLS_H | |
20 | #define _TLS_H | |
21 | ||
22 | # include <dl-sysdep.h> | |
23 | ||
24 | #ifndef __ASSEMBLER__ | |
9dcafc55 | 25 | # include <stdbool.h> |
a54e8d33 UD |
26 | # include <stddef.h> |
27 | # include <stdint.h> | |
0a2b90bd UD |
28 | # include <stdlib.h> |
29 | # include <list.h> | |
30 | # include <sysdep.h> | |
aca1daef | 31 | # include <dl-dtv.h> |
a54e8d33 UD |
32 | |
33 | typedef struct | |
34 | { | |
35 | dtv_t *dtv; | |
d9038ff8 | 36 | uintptr_t pointer_guard; |
a54e8d33 UD |
37 | } tcbhead_t; |
38 | ||
eec0ca9f JJ |
39 | # define TLS_MULTIPLE_THREADS_IN_TCB 1 |
40 | ||
a54e8d33 UD |
41 | #else /* __ASSEMBLER__ */ |
42 | # include <tcb-offsets.h> | |
43 | #endif /* __ASSEMBLER__ */ | |
44 | ||
45 | ||
a54e8d33 UD |
46 | #ifndef __ASSEMBLER__ |
47 | ||
48 | /* Get system call information. */ | |
49 | # include <sysdep.h> | |
50 | ||
a54e8d33 UD |
51 | /* This is the size of the initial TCB. */ |
52 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) | |
53 | ||
a54e8d33 UD |
54 | /* This is the size of the TCB. */ |
55 | # define TLS_TCB_SIZE sizeof (tcbhead_t) | |
56 | ||
57 | /* This is the size we need before TCB. */ | |
58 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) | |
59 | ||
a54e8d33 UD |
60 | /* The TLS blocks start right after the TCB. */ |
61 | # define TLS_DTV_AT_TP 1 | |
498a2233 | 62 | # define TLS_TCB_AT_TP 0 |
a54e8d33 | 63 | |
10e717a2 UD |
64 | /* Get the thread descriptor definition. */ |
65 | # include <nptl/descr.h> | |
a54e8d33 UD |
66 | |
67 | /* Install the dtv pointer. The pointer passed is to the element with | |
68 | index -1 which contain the length. */ | |
69 | # define INSTALL_DTV(tcbp, dtvp) \ | |
10e717a2 | 70 | ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1 |
a54e8d33 UD |
71 | |
72 | /* Install new dtv for current thread. */ | |
73 | # define INSTALL_NEW_DTV(dtv) \ | |
74 | ({ tcbhead_t *__tcbp; \ | |
75 | __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ | |
76 | __tcbp->dtv = (dtv);}) | |
77 | ||
78 | /* Return dtv of given thread descriptor. */ | |
79 | # define GET_DTV(tcbp) \ | |
80 | (((tcbhead_t *) (tcbp))->dtv) | |
81 | ||
82 | /* Code to initially initialize the thread pointer. This might need | |
83 | special attention since 'errno' is not yet available and if the | |
84 | operation can cause a failure 'errno' must not be touched. */ | |
774f9285 | 85 | # define TLS_INIT_TP(tcbp) \ |
f82c43af | 86 | ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); NULL; }) |
a54e8d33 | 87 | |
acaa4d24 RM |
88 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 |
89 | ||
a54e8d33 UD |
90 | /* Return the address of the dtv for the current thread. */ |
91 | # define THREAD_DTV() \ | |
92 | ({ tcbhead_t *__tcbp; \ | |
93 | __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ | |
94 | __tcbp->dtv;}) | |
95 | ||
96 | /* Return the thread descriptor for the current thread. | |
97 | The contained asm must *not* be marked volatile since otherwise | |
98 | assignments like | |
83cd1420 | 99 | struct pthread *self = thread_self(); |
a54e8d33 UD |
100 | do not get optimized away. */ |
101 | # define THREAD_SELF \ | |
102 | ({ struct pthread *__self; \ | |
103 | __asm ("stc gbr,%0" : "=r" (__self)); \ | |
104 | __self - 1;}) | |
105 | ||
7f08f55a | 106 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
3defcff3 UD |
107 | # define DB_THREAD_SELF \ |
108 | REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread)) | |
7f08f55a | 109 | |
ce2248ab | 110 | # include <tcb-access.h> |
a54e8d33 | 111 | |
d9038ff8 UD |
112 | #define THREAD_GET_POINTER_GUARD() \ |
113 | ({ tcbhead_t *__tcbp; \ | |
114 | __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ | |
115 | __tcbp->pointer_guard;}) | |
116 | #define THREAD_SET_POINTER_GUARD(value) \ | |
117 | ({ tcbhead_t *__tcbp; \ | |
118 | __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ | |
119 | __tcbp->pointer_guard = (value);}) | |
120 | #define THREAD_COPY_POINTER_GUARD(descr) \ | |
121 | ({ tcbhead_t *__tcbp; \ | |
122 | __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \ | |
123 | ((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;}) | |
124 | ||
991fa82b UD |
125 | /* Get and set the global scope generation counter in struct pthread. */ |
126 | #define THREAD_GSCOPE_FLAG_UNUSED 0 | |
127 | #define THREAD_GSCOPE_FLAG_USED 1 | |
128 | #define THREAD_GSCOPE_FLAG_WAIT 2 | |
129 | #define THREAD_GSCOPE_RESET_FLAG() \ | |
130 | do \ | |
131 | { int __res \ | |
132 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ | |
133 | THREAD_GSCOPE_FLAG_UNUSED); \ | |
134 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ | |
085a4412 | 135 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
991fa82b UD |
136 | } \ |
137 | while (0) | |
138 | #define THREAD_GSCOPE_SET_FLAG() \ | |
139 | do \ | |
140 | { \ | |
141 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ | |
142 | atomic_write_barrier (); \ | |
143 | } \ | |
144 | while (0) | |
991fa82b | 145 | |
a54e8d33 UD |
146 | #endif /* __ASSEMBLER__ */ |
147 | ||
148 | #endif /* tls.h */ |