mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-09 10:50:08 +00:00
0c76fc3c2b
Register rseq TLS for each thread (including main), and unregister for
each thread (excluding main). "rseq" stands for Restartable Sequences.
See the rseq(2) man page proposed here:
https://lkml.org/lkml/2018/9/19/647
Those are based on glibc master branch commit 3ee1e0ec5c.
The rseq system call was merged into Linux 4.18.
The TLS_STATIC_SURPLUS define is increased to leave additional room for
dlopen'd initial-exec TLS, which keeps elf/tst-auditmany working.
The increase (76 bytes) is larger than 32 bytes because it has not been
increased in quite a while. The cost in terms of additional TLS storage
is quite significant, but it will also obscure some initial-exec-related
dlopen failures.
30 lines
1.3 KiB
C
30 lines
1.3 KiB
C
/* Restartable Sequences architecture header. Stub version.
|
|
Copyright (C) 2020 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 _SYS_RSEQ_H
|
|
# error "Never use <bits/rseq.h> directly; include <sys/rseq.h> instead."
|
|
#endif
|
|
|
|
/* RSEQ_SIG is a signature required before each abort handler code.
|
|
|
|
It is a 32-bit value that maps to actual architecture code compiled
|
|
into applications and libraries. It needs to be defined for each
|
|
architecture. When choosing this value, it needs to be taken into
|
|
account that generating invalid instructions may have ill effects on
|
|
tools like objdump, and may also have impact on the CPU speculative
|
|
execution efficiency in some cases. */
|