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9d124d81f0
Permissions of the cached stacks may have to be updated if an object is loaded that requires executable stacks, so the dynamic loader needs to know about these cached stacks. The move of in_flight_stack and stack_cache_actsize is a requirement for merging __reclaim_stacks into the fork implementation in libc. Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* Completion of TCB initialization after TLS_INIT_TP. NPTL version.
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Copyright (C) 2020-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <kernel-features.h>
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#include <ldsodefs.h>
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#include <list.h>
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#include <nptl/pthreadP.h>
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#include <tls.h>
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#ifndef __ASSUME_SET_ROBUST_LIST
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bool __nptl_set_robust_list_avail __attribute__ ((nocommon));
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rtld_hidden_data_def (__nptl_set_robust_list_avail)
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#endif
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#ifdef SHARED
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/* Dummy implementation. See __rtld_mutex_init. */
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static int
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rtld_mutex_dummy (pthread_mutex_t *lock)
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{
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return 0;
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}
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#endif
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void
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__tls_pre_init_tp (void)
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{
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/* The list data structures are not consistent until
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initialized. */
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INIT_LIST_HEAD (&GL (dl_stack_used));
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INIT_LIST_HEAD (&GL (dl_stack_user));
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INIT_LIST_HEAD (&GL (dl_stack_cache));
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#ifdef SHARED
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___rtld_mutex_lock = rtld_mutex_dummy;
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___rtld_mutex_unlock = rtld_mutex_dummy;
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#endif
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}
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void
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__tls_init_tp (void)
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{
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/* Set up thread stack list management. */
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list_add (&THREAD_SELF->list, &GL (dl_stack_user));
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/* Early initialization of the TCB. */
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struct pthread *pd = THREAD_SELF;
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pd->tid = INTERNAL_SYSCALL_CALL (set_tid_address, &pd->tid);
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THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]);
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THREAD_SETMEM (pd, user_stack, true);
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/* Initialize the robust mutex data. */
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{
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#if __PTHREAD_MUTEX_HAVE_PREV
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pd->robust_prev = &pd->robust_head;
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#endif
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pd->robust_head.list = &pd->robust_head;
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pd->robust_head.futex_offset = (offsetof (pthread_mutex_t, __data.__lock)
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- offsetof (pthread_mutex_t,
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__data.__list.__next));
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int res = INTERNAL_SYSCALL_CALL (set_robust_list, &pd->robust_head,
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sizeof (struct robust_list_head));
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if (!INTERNAL_SYSCALL_ERROR_P (res))
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{
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#ifndef __ASSUME_SET_ROBUST_LIST
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__nptl_set_robust_list_avail = true;
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#endif
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}
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}
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/* Set initial thread's stack block from 0 up to __libc_stack_end.
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It will be bigger than it actually is, but for unwind.c/pt-longjmp.c
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purposes this is good enough. */
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THREAD_SETMEM (pd, stackblock_size, (size_t) __libc_stack_end);
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}
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