From 95e114a0919d844d8fe07839cb6538b7f5ee920e Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Thu, 9 Dec 2021 09:49:32 +0100 Subject: nptl: Add rseq registration 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. is not yet installed as a public header. Co-Authored-By: Mathieu Desnoyers Reviewed-by: Szabolcs Nagy Reviewed-by: Siddhesh Poyarekar --- sysdeps/unix/sysv/linux/rseq-internal.h | 45 +++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/rseq-internal.h (limited to 'sysdeps/unix/sysv/linux/rseq-internal.h') diff --git a/sysdeps/unix/sysv/linux/rseq-internal.h b/sysdeps/unix/sysv/linux/rseq-internal.h new file mode 100644 index 0000000000..909f547825 --- /dev/null +++ b/sysdeps/unix/sysv/linux/rseq-internal.h @@ -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 + . */ + +#ifndef RSEQ_INTERNAL_H +#define RSEQ_INTERNAL_H + +#include +#include +#include +#include +#include + +#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 */ -- cgit 1.4.1