mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
38 lines
1.7 KiB
C
38 lines
1.7 KiB
C
/* Restartable Sequences Linux s390 architecture header.
|
|
Copyright (C) 2021-2025 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.
|
|
|
|
RSEQ_SIG uses the trap4 instruction. As Linux does not make use of the
|
|
access-register mode nor the linkage stack this instruction will always
|
|
cause a special-operation exception (the trap-enabled bit in the DUCT
|
|
is and will stay 0). The instruction pattern is
|
|
b2 ff 0f ff trap4 4095(%r0) */
|
|
|
|
#define RSEQ_SIG 0xB2FF0FFF
|