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/* Completion of TCB initialization after TLS_INIT_TP. NPTL version.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <kernel-features.h>
#include <ldsodefs.h>
#include <list.h>
#include <pthreadP.h>
#include <tls.h>
#include <rseq-internal.h>
#include <thread_pointer.h>
#define TUNABLE_NAMESPACE pthread
#include <dl-tunables.h>
#ifndef __ASSUME_SET_ROBUST_LIST
bool __nptl_set_robust_list_avail;
rtld_hidden_data_def (__nptl_set_robust_list_avail)
#endif
bool __nptl_initial_report_events;
rtld_hidden_def (__nptl_initial_report_events)
#ifdef SHARED
/* Dummy implementation. See __rtld_mutex_init. */
static int
rtld_mutex_dummy (pthread_mutex_t *lock)
{
return 0;
}
#endif
const unsigned int __rseq_flags;
const unsigned int __rseq_size attribute_relro;
const ptrdiff_t __rseq_offset attribute_relro;
void
__tls_pre_init_tp (void)
{
/* The list data structures are not consistent until
initialized. */
INIT_LIST_HEAD (&GL (dl_stack_used));
INIT_LIST_HEAD (&GL (dl_stack_user));
INIT_LIST_HEAD (&GL (dl_stack_cache));
#ifdef SHARED
___rtld_mutex_lock = rtld_mutex_dummy;
___rtld_mutex_unlock = rtld_mutex_dummy;
#endif
}
void
__tls_init_tp (void)
{
struct pthread *pd = THREAD_SELF;
/* Set up thread stack list management. */
list_add (&pd->list, &GL (dl_stack_user));
/* Early initialization of the TCB. */
pd->tid = INTERNAL_SYSCALL_CALL (set_tid_address, &pd->tid);
THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]);
THREAD_SETMEM (pd, user_stack, true);
/* Before initializing GL (dl_stack_user), the debugger could not
find us and had to set __nptl_initial_report_events. Propagate
its setting. */
THREAD_SETMEM (pd, report_events, __nptl_initial_report_events);
/* Initialize the robust mutex data. */
{
#if __PTHREAD_MUTEX_HAVE_PREV
pd->robust_prev = &pd->robust_head;
#endif
pd->robust_head.list = &pd->robust_head;
pd->robust_head.futex_offset = (offsetof (pthread_mutex_t, __data.__lock)
- offsetof (pthread_mutex_t,
__data.__list.__next));
int res = INTERNAL_SYSCALL_CALL (set_robust_list, &pd->robust_head,
sizeof (struct robust_list_head));
if (!INTERNAL_SYSCALL_ERROR_P (res))
{
#ifndef __ASSUME_SET_ROBUST_LIST
__nptl_set_robust_list_avail = true;
#endif
}
}
{
bool do_rseq = true;
do_rseq = TUNABLE_GET (rseq, int, NULL);
if (rseq_register_current_thread (pd, do_rseq))
{
/* We need a writable view of the variables. They are in
.data.relro and are not yet write-protected. */
extern unsigned int size __asm__ ("__rseq_size");
size = sizeof (pd->rseq_area);
}
#ifdef RSEQ_SIG
/* This should be a compile-time constant, but the current
infrastructure makes it difficult to determine its value. Not
all targets support __thread_pointer, so set __rseq_offset only
if the rseq registration may have happened because RSEQ_SIG is
defined. */
extern ptrdiff_t offset __asm__ ("__rseq_offset");
offset = (char *) &pd->rseq_area - (char *) __thread_pointer ();
#endif
}
/* Set initial thread's stack block from 0 up to __libc_stack_end.
It will be bigger than it actually is, but for unwind.c/pt-longjmp.c
purposes this is good enough. */
THREAD_SETMEM (pd, stackblock_size, (size_t) __libc_stack_end);
}
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