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5f72b005 | 1 | /* Definitions for thread-local data handling. NPTL/C-SKY version. |
2b778ceb | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
5f72b005 MH |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5f72b005 MH |
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 | # include <tcb-offsets.h> | |
38 | /* Define r31 as thread pointer register. */ | |
39 | # define READ_THREAD_POINTER() \ | |
40 | mov r0, r31; | |
41 | #endif /* __ASSEMBLER__ */ | |
42 | ||
43 | #ifndef __ASSEMBLER__ | |
44 | ||
45 | /* Get system call information. */ | |
46 | # include <sysdep.h> | |
47 | ||
48 | /* The TP points to the start of the thread blocks. */ | |
49 | # define TLS_DTV_AT_TP 1 | |
50 | # define TLS_TCB_AT_TP 0 | |
51 | ||
52 | /* Get the thread descriptor definition. */ | |
53 | # include <nptl/descr.h> | |
54 | ||
55 | typedef struct | |
56 | { | |
57 | dtv_t *dtv; | |
58 | void *private; | |
59 | } tcbhead_t; | |
60 | ||
61 | /* This is the size of the initial TCB. */ | |
62 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) | |
63 | ||
5f72b005 MH |
64 | /* This is the size of the TCB. */ |
65 | # define TLS_TCB_SIZE sizeof (tcbhead_t) | |
66 | ||
5f72b005 MH |
67 | /* This is the size we need before TCB. */ |
68 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) | |
69 | ||
70 | /* The thread pointer tp points to the end of the TCB. | |
71 | The pthread_descr structure is immediately in front of the TCB. */ | |
72 | # define TLS_TCB_OFFSET 0 | |
73 | ||
74 | /* Install the dtv pointer. The pointer passed is to the element with | |
75 | index -1 which contain the length. */ | |
76 | # define INSTALL_DTV(tcbp, dtvp) \ | |
77 | (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) | |
78 | ||
79 | /* Install new dtv for current thread. */ | |
80 | # define INSTALL_NEW_DTV(dtv) \ | |
81 | (THREAD_DTV() = (dtv)) | |
82 | ||
83 | /* Return dtv of given thread descriptor. */ | |
84 | # define GET_DTV(tcbp) \ | |
85 | (((tcbhead_t *) (tcbp))->dtv) | |
86 | ||
87 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 | |
88 | ||
89 | /* Code to initially initialize the thread pointer. This might need | |
90 | special attention since 'errno' is not yet available and if the | |
91 | operation can cause a failure 'errno' must not be touched. */ | |
92 | # define TLS_INIT_TP(tcbp) \ | |
bc2eb932 AZ |
93 | ({ long int result_var; \ |
94 | result_var = INTERNAL_SYSCALL_CALL (set_thread_area, \ | |
5f72b005 | 95 | (char *) (tcbp) + TLS_TCB_OFFSET); \ |
bc2eb932 | 96 | INTERNAL_SYSCALL_ERROR_P (result_var) \ |
5f72b005 MH |
97 | ? "unknown error" : NULL; }) |
98 | ||
99 | /* Return the address of the dtv for the current thread. */ | |
100 | # define THREAD_DTV() \ | |
101 | (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))->dtv) | |
102 | ||
103 | /* Return the thread descriptor for the current thread. */ | |
104 | # undef THREAD_SELF | |
105 | # define THREAD_SELF \ | |
106 | ((struct pthread *) (READ_THREAD_POINTER () \ | |
107 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) | |
108 | ||
109 | /* Magic for libthread_db to know how to do THREAD_SELF. */ | |
110 | # define DB_THREAD_SELF \ | |
111 | CONST_THREAD_AREA (32, sizeof (struct pthread)) | |
112 | ||
ce2248ab | 113 | # include <tcb-access.h> |
5f72b005 MH |
114 | |
115 | /* Get and set the global scope generation counter in struct pthread. */ | |
5f72b005 MH |
116 | # define THREAD_GSCOPE_FLAG_UNUSED 0 |
117 | # define THREAD_GSCOPE_FLAG_USED 1 | |
118 | # define THREAD_GSCOPE_FLAG_WAIT 2 | |
119 | # define THREAD_GSCOPE_RESET_FLAG() \ | |
120 | do \ | |
121 | { int __res \ | |
122 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ | |
123 | THREAD_GSCOPE_FLAG_UNUSED); \ | |
124 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ | |
125 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ | |
126 | } \ | |
127 | while (0) | |
128 | # define THREAD_GSCOPE_SET_FLAG() \ | |
129 | do \ | |
130 | { \ | |
131 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ | |
132 | atomic_write_barrier (); \ | |
133 | } \ | |
134 | while (0) | |
5f72b005 MH |
135 | |
136 | #endif /* __ASSEMBLER__ */ | |
137 | ||
138 | #endif /* tls.h */ |