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author | Florian Weimer <fweimer@redhat.com> | 2021-12-09 09:49:32 +0100 |
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committer | Florian Weimer <fweimer@redhat.com> | 2021-12-09 09:49:32 +0100 |
commit | 95e114a0919d844d8fe07839cb6538b7f5ee920e (patch) | |
tree | 530964270c0a6baf1dd741e00c4f5f205631d70e /sysdeps/unix/sysv/linux/bits/rseq.h | |
parent | 8d1927d8dc5aad0f01c929123086be3a5b799d18 (diff) | |
download | glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.tar.gz glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.tar.xz glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.zip |
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. <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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/bits/rseq.h')
-rw-r--r-- | sysdeps/unix/sysv/linux/bits/rseq.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/rseq.h b/sysdeps/unix/sysv/linux/bits/rseq.h new file mode 100644 index 0000000000..46cf5d1c74 --- /dev/null +++ b/sysdeps/unix/sysv/linux/bits/rseq.h @@ -0,0 +1,29 @@ +/* Restartable Sequences architecture header. Stub version. + 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 _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. */ |