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1 | /* Copyright (C) 2005-2022 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 | /* This is the size of the initial TCB. */ |
50 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) |
51 | |
52 | /* This is the size of the TCB. */ |
53 | # define TLS_TCB_SIZE sizeof (tcbhead_t) |
54 | |
55 | /* This is the size we need before TCB. */ |
56 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) |
57 | |
58 | /* Install the dtv pointer. The pointer passed is to the element with |
59 | index -1 which contain the length. */ |
60 | # define INSTALL_DTV(tcbp, dtvp) \ |
61 | (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) |
62 | |
63 | /* Install new dtv for current thread. */ |
64 | # define INSTALL_NEW_DTV(dtv) \ |
65 | (THREAD_DTV() = (dtv)) |
66 | |
67 | /* Return dtv of given thread descriptor. */ |
68 | # define GET_DTV(tcbp) \ |
69 | (((tcbhead_t *) (tcbp))->dtv) |
70 | |
71 | /* Code to initially initialize the thread pointer. This might need |
72 | special attention since 'errno' is not yet available and if the |
73 | operation can cause a failure 'errno' must not be touched. */ |
74 | # define TLS_INIT_TP(tcbp) \ |
75 | ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); NULL; }) |
76 | |
77 | /* Value passed to 'clone' for initialization of the thread register. */ |
78 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 |
79 | |
80 | /* Return the address of the dtv for the current thread. */ |
81 | # define THREAD_DTV() \ |
82 | (((tcbhead_t *) __builtin_thread_pointer ())->dtv) |
83 | |
84 | /* Return the thread descriptor for the current thread. */ |
85 | # define THREAD_SELF \ |
86 | ((struct pthread *)__builtin_thread_pointer () - 1) |
87 | |
88 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
89 | # define DB_THREAD_SELF \ |
90 | CONST_THREAD_AREA (64, sizeof (struct pthread)) |
91 | |
92 | # include <tcb-access.h> |
93 | |
94 | /* Get and set the global scope generation counter in struct pthread. */ |
95 | # define THREAD_GSCOPE_FLAG_UNUSED 0 |
96 | # define THREAD_GSCOPE_FLAG_USED 1 |
97 | # define THREAD_GSCOPE_FLAG_WAIT 2 |
98 | # define THREAD_GSCOPE_RESET_FLAG() \ |
99 | do \ |
100 | { int __res \ |
101 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ |
102 | THREAD_GSCOPE_FLAG_UNUSED); \ |
103 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
104 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
105 | } \ |
106 | while (0) |
107 | # define THREAD_GSCOPE_SET_FLAG() \ |
108 | do \ |
109 | { \ |
110 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
111 | atomic_write_barrier (); \ |
112 | } \ |
113 | while (0) |
114 | |
115 | # endif /* __ASSEMBLER__ */ |
116 | |
117 | #endif /* tls.h */ |
118 |
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