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nptl: Add rseq registration

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The rseq area is placed directly into struct pthread.  rseq
registration failure is not treated as an error, so it is possible
that threads run with inconsistent registration status.

<sys/rseq.h> is not yet installed as a public header.

Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
2021-12-09 09:49:32 +01:00
parent 8d1927d8dc
commit 95e114a091
16 changed files with 952 additions and 3 deletions
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45
sysdeps/unix/sysv/linux/rseq-internal.h Normal file
View File

@ -0,0 +1,45 @@
/* Restartable Sequences internal API. Linux implementation.
Copyright (C) 2021 Free Software Foundation, Inc.
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/>. */
#ifndef RSEQ_INTERNAL_H
#define RSEQ_INTERNAL_H
#include <sysdep.h>
#include <errno.h>
#include <kernel-features.h>
#include <stdio.h>
#include <sys/rseq.h>
#ifdef RSEQ_SIG
static inline void
rseq_register_current_thread (struct pthread *self)
{
int ret = INTERNAL_SYSCALL_CALL (rseq,
&self->rseq_area, sizeof (self->rseq_area),
0, RSEQ_SIG);
if (INTERNAL_SYSCALL_ERROR_P (ret))
THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
}
#else /* RSEQ_SIG */
static inline void
rseq_register_current_thread (struct pthread *self)
{
THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
}
#endif /* RSEQ_SIG */
#endif /* rseq-internal.h */