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90d7e7e5 FW |
1 | /* Completion of TCB initialization after TLS_INIT_TP. NPTL version. |
2 | Copyright (C) 2020-2021 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 | ||
442e8a40 | 19 | #include <kernel-features.h> |
90d7e7e5 FW |
20 | #include <ldsodefs.h> |
21 | #include <list.h> | |
442e8a40 | 22 | #include <nptl/pthreadP.h> |
90d7e7e5 FW |
23 | #include <tls.h> |
24 | ||
442e8a40 | 25 | #ifndef __ASSUME_SET_ROBUST_LIST |
65733961 | 26 | bool __nptl_set_robust_list_avail __attribute__ ((nocommon)); |
442e8a40 FW |
27 | rtld_hidden_data_def (__nptl_set_robust_list_avail) |
28 | #endif | |
29 | ||
a78e5979 FW |
30 | bool __nptl_initial_report_events __attribute__ ((nocommon)); |
31 | rtld_hidden_def (__nptl_initial_report_events) | |
32 | ||
d017b0ab FW |
33 | #ifdef SHARED |
34 | /* Dummy implementation. See __rtld_mutex_init. */ | |
35 | static int | |
36 | rtld_mutex_dummy (pthread_mutex_t *lock) | |
37 | { | |
38 | return 0; | |
39 | } | |
40 | #endif | |
41 | ||
90d7e7e5 | 42 | void |
d017b0ab | 43 | __tls_pre_init_tp (void) |
90d7e7e5 | 44 | { |
d017b0ab FW |
45 | /* The list data structures are not consistent until |
46 | initialized. */ | |
90d7e7e5 FW |
47 | INIT_LIST_HEAD (&GL (dl_stack_used)); |
48 | INIT_LIST_HEAD (&GL (dl_stack_user)); | |
9d124d81 | 49 | INIT_LIST_HEAD (&GL (dl_stack_cache)); |
d017b0ab FW |
50 | |
51 | #ifdef SHARED | |
52 | ___rtld_mutex_lock = rtld_mutex_dummy; | |
53 | ___rtld_mutex_unlock = rtld_mutex_dummy; | |
54 | #endif | |
55 | } | |
56 | ||
57 | void | |
58 | __tls_init_tp (void) | |
59 | { | |
60 | /* Set up thread stack list management. */ | |
90d7e7e5 | 61 | list_add (&THREAD_SELF->list, &GL (dl_stack_user)); |
442e8a40 FW |
62 | |
63 | /* Early initialization of the TCB. */ | |
64 | struct pthread *pd = THREAD_SELF; | |
65 | pd->tid = INTERNAL_SYSCALL_CALL (set_tid_address, &pd->tid); | |
66 | THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]); | |
67 | THREAD_SETMEM (pd, user_stack, true); | |
68 | ||
a78e5979 FW |
69 | /* Before initializing GL (dl_stack_user), the debugger could not |
70 | find us and had to set __nptl_initial_report_events. Propagate | |
71 | its setting. */ | |
72 | THREAD_SETMEM (pd, report_events, __nptl_initial_report_events); | |
73 | ||
442e8a40 FW |
74 | /* Initialize the robust mutex data. */ |
75 | { | |
76 | #if __PTHREAD_MUTEX_HAVE_PREV | |
77 | pd->robust_prev = &pd->robust_head; | |
78 | #endif | |
79 | pd->robust_head.list = &pd->robust_head; | |
80 | pd->robust_head.futex_offset = (offsetof (pthread_mutex_t, __data.__lock) | |
81 | - offsetof (pthread_mutex_t, | |
82 | __data.__list.__next)); | |
83 | int res = INTERNAL_SYSCALL_CALL (set_robust_list, &pd->robust_head, | |
84 | sizeof (struct robust_list_head)); | |
85 | if (!INTERNAL_SYSCALL_ERROR_P (res)) | |
86 | { | |
87 | #ifndef __ASSUME_SET_ROBUST_LIST | |
88 | __nptl_set_robust_list_avail = true; | |
89 | #endif | |
90 | } | |
91 | } | |
92 | ||
93 | /* Set initial thread's stack block from 0 up to __libc_stack_end. | |
94 | It will be bigger than it actually is, but for unwind.c/pt-longjmp.c | |
95 | purposes this is good enough. */ | |
96 | THREAD_SETMEM (pd, stackblock_size, (size_t) __libc_stack_end); | |
90d7e7e5 | 97 | } |