Warning: This file is not a C or C++ file. It does not have highlighting.
1 | /* Definitions for thread-local data handling. NPTL/sparc version. |
---|---|
2 | Copyright (C) 2003-2024 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 |
21 | |
22 | #include <dl-sysdep.h> |
23 | #ifndef __ASSEMBLER__ |
24 | # include <stdbool.h> |
25 | # include <stddef.h> |
26 | # include <stdint.h> |
27 | # include <stdlib.h> |
28 | # include <list.h> |
29 | # include <kernel-features.h> |
30 | # include <dl-dtv.h> |
31 | |
32 | typedef struct |
33 | { |
34 | void *tcb; /* Pointer to the TCB. Not necessary the |
35 | thread descriptor used by libpthread. */ |
36 | dtv_t *dtv; |
37 | void *self; |
38 | int multiple_threads; |
39 | #if __WORDSIZE == 64 |
40 | int gscope_flag; |
41 | #endif |
42 | uintptr_t sysinfo; |
43 | uintptr_t stack_guard; |
44 | uintptr_t pointer_guard; |
45 | #if __WORDSIZE != 64 |
46 | int gscope_flag; |
47 | #endif |
48 | } tcbhead_t; |
49 | |
50 | #else /* __ASSEMBLER__ */ |
51 | # include <tcb-offsets.h> |
52 | #endif /* __ASSEMBLER__ */ |
53 | |
54 | |
55 | #ifndef __ASSEMBLER__ |
56 | /* Get system call information. */ |
57 | # include <sysdep.h> |
58 | |
59 | register struct pthread *__thread_self __asm__("%g7"); |
60 | |
61 | /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t), |
62 | because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole |
63 | struct pthread even when not linked with -lpthread. */ |
64 | # define TLS_INIT_TCB_SIZE sizeof (struct pthread) |
65 | |
66 | /* This is the size of the TCB. */ |
67 | # define TLS_TCB_SIZE sizeof (struct pthread) |
68 | |
69 | /* The TCB can have any size and the memory following the address the |
70 | thread pointer points to is unspecified. Allocate the TCB there. */ |
71 | # define TLS_TCB_AT_TP 1 |
72 | # define TLS_DTV_AT_TP 0 |
73 | |
74 | /* Get the thread descriptor definition. */ |
75 | # include <nptl/descr.h> |
76 | |
77 | /* Install the dtv pointer. The pointer passed is to the element with |
78 | index -1 which contain the length. */ |
79 | # define INSTALL_DTV(descr, dtvp) \ |
80 | ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 |
81 | |
82 | /* Install new dtv for current thread. */ |
83 | # define INSTALL_NEW_DTV(DTV) \ |
84 | (((tcbhead_t *) __thread_self)->dtv = (DTV)) |
85 | |
86 | /* Return dtv of given thread descriptor. */ |
87 | # define GET_DTV(descr) \ |
88 | (((tcbhead_t *) (descr))->dtv) |
89 | |
90 | /* Code to initially initialize the thread pointer. */ |
91 | # define TLS_INIT_TP(descr) \ |
92 | (__thread_self = (__typeof (__thread_self)) (descr), true) |
93 | |
94 | /* Value passed to 'clone' for initialization of the thread register. */ |
95 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) |
96 | |
97 | /* Return the address of the dtv for the current thread. */ |
98 | # define THREAD_DTV() \ |
99 | (((tcbhead_t *) __thread_self)->dtv) |
100 | |
101 | /* Return the thread descriptor for the current thread. */ |
102 | #define THREAD_SELF __thread_self |
103 | |
104 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
105 | # define DB_THREAD_SELF \ |
106 | REGISTER (32, 32, 10 * 4, 0) \ |
107 | REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0) |
108 | |
109 | # include <tcb-access.h> |
110 | |
111 | /* Set the stack guard field in TCB head. */ |
112 | #define THREAD_SET_STACK_GUARD(value) \ |
113 | THREAD_SETMEM (THREAD_SELF, header.stack_guard, value) |
114 | # define THREAD_COPY_STACK_GUARD(descr) \ |
115 | ((descr)->header.stack_guard \ |
116 | = THREAD_GETMEM (THREAD_SELF, header.stack_guard)) |
117 | |
118 | /* Get/set the stack guard field in TCB head. */ |
119 | #define THREAD_GET_POINTER_GUARD() \ |
120 | THREAD_GETMEM (THREAD_SELF, header.pointer_guard) |
121 | #define THREAD_SET_POINTER_GUARD(value) \ |
122 | THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value) |
123 | # define THREAD_COPY_POINTER_GUARD(descr) \ |
124 | ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ()) |
125 | |
126 | /* Get and set the global scope generation counter in struct pthread. */ |
127 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
128 | #define THREAD_GSCOPE_FLAG_USED 1 |
129 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
130 | #define THREAD_GSCOPE_RESET_FLAG() \ |
131 | do \ |
132 | { int __res \ |
133 | = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \ |
134 | THREAD_GSCOPE_FLAG_UNUSED); \ |
135 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
136 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
137 | } \ |
138 | while (0) |
139 | #define THREAD_GSCOPE_SET_FLAG() \ |
140 | do \ |
141 | { \ |
142 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
143 | atomic_write_barrier (); \ |
144 | } \ |
145 | while (0) |
146 | |
147 | #endif /* !ASSEMBLER */ |
148 | |
149 | #endif /* tls.h */ |
150 |
Warning: This file is not a C or C++ file. It does not have highlighting.