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1 | /* Definitions for thread-local data handling. NPTL/C-SKY version. |
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2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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 |
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 | #ifndef __ASSEMBLER__ |
23 | |
24 | # include <stdbool.h> |
25 | # include <stddef.h> |
26 | # include <stdint.h> |
27 | # include <dl-dtv.h> |
28 | |
29 | /* Define r31 as thread pointer register. */ |
30 | # define READ_THREAD_POINTER() \ |
31 | ({ void *__result; \ |
32 | __asm__ __volatile__ ("mov %0, r31" \ |
33 | : "=r" (__result)); \ |
34 | __result; }) |
35 | |
36 | #else |
37 | /* Define r31 as thread pointer register. */ |
38 | # define READ_THREAD_POINTER() \ |
39 | mov r0, r31; |
40 | #endif /* __ASSEMBLER__ */ |
41 | |
42 | #ifndef __ASSEMBLER__ |
43 | |
44 | /* Get system call information. */ |
45 | # include <sysdep.h> |
46 | |
47 | /* The TP points to the start of the thread blocks. */ |
48 | # define TLS_DTV_AT_TP 1 |
49 | # define TLS_TCB_AT_TP 0 |
50 | |
51 | /* Get the thread descriptor definition. */ |
52 | # include <nptl/descr.h> |
53 | |
54 | typedef struct |
55 | { |
56 | dtv_t *dtv; |
57 | void *private; |
58 | } tcbhead_t; |
59 | |
60 | /* This is the size of the initial TCB. */ |
61 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) |
62 | |
63 | /* This is the size of the TCB. */ |
64 | # define TLS_TCB_SIZE sizeof (tcbhead_t) |
65 | |
66 | /* This is the size we need before TCB. */ |
67 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) |
68 | |
69 | /* The thread pointer tp points to the end of the TCB. |
70 | The pthread_descr structure is immediately in front of the TCB. */ |
71 | # define TLS_TCB_OFFSET 0 |
72 | |
73 | /* Install the dtv pointer. The pointer passed is to the element with |
74 | index -1 which contain the length. */ |
75 | # define INSTALL_DTV(tcbp, dtvp) \ |
76 | (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) |
77 | |
78 | /* Install new dtv for current thread. */ |
79 | # define INSTALL_NEW_DTV(dtv) \ |
80 | (THREAD_DTV() = (dtv)) |
81 | |
82 | /* Return dtv of given thread descriptor. */ |
83 | # define GET_DTV(tcbp) \ |
84 | (((tcbhead_t *) (tcbp))->dtv) |
85 | |
86 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 |
87 | |
88 | /* Code to initially initialize the thread pointer. This might need |
89 | special attention since 'errno' is not yet available and if the |
90 | operation can cause a failure 'errno' must not be touched. */ |
91 | # define TLS_INIT_TP(tcbp) \ |
92 | ({ long int result_var; \ |
93 | result_var = INTERNAL_SYSCALL_CALL (set_thread_area, \ |
94 | (char *) (tcbp) + TLS_TCB_OFFSET); \ |
95 | !INTERNAL_SYSCALL_ERROR_P (result_var); }) |
96 | |
97 | /* Return the address of the dtv for the current thread. */ |
98 | # define THREAD_DTV() \ |
99 | (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))->dtv) |
100 | |
101 | /* Return the thread descriptor for the current thread. */ |
102 | # undef THREAD_SELF |
103 | # define THREAD_SELF \ |
104 | ((struct pthread *) (READ_THREAD_POINTER () \ |
105 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
106 | |
107 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
108 | # define DB_THREAD_SELF \ |
109 | CONST_THREAD_AREA (32, sizeof (struct pthread)) |
110 | |
111 | # include <tcb-access.h> |
112 | |
113 | /* Get and set the global scope generation counter in struct pthread. */ |
114 | # define THREAD_GSCOPE_FLAG_UNUSED 0 |
115 | # define THREAD_GSCOPE_FLAG_USED 1 |
116 | # define THREAD_GSCOPE_FLAG_WAIT 2 |
117 | # define THREAD_GSCOPE_RESET_FLAG() \ |
118 | do \ |
119 | { int __res \ |
120 | = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \ |
121 | THREAD_GSCOPE_FLAG_UNUSED); \ |
122 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
123 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
124 | } \ |
125 | while (0) |
126 | # define THREAD_GSCOPE_SET_FLAG() \ |
127 | do \ |
128 | { \ |
129 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
130 | atomic_write_barrier (); \ |
131 | } \ |
132 | while (0) |
133 | |
134 | #endif /* __ASSEMBLER__ */ |
135 | |
136 | #endif /* tls.h */ |
137 |
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