1 /* Restartable Sequences Linux aarch64 architecture header.
2    Copyright (C) 2021-2022 Free Software Foundation, Inc.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library; if not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #ifndef _SYS_RSEQ_H
19 # error "Never use <bits/rseq.h> directly; include <sys/rseq.h> instead."
20 #endif
21 
22 /* RSEQ_SIG is a signature required before each abort handler code.
23 
24    It is a 32-bit value that maps to actual architecture code compiled
25    into applications and libraries.  It needs to be defined for each
26    architecture.  When choosing this value, it needs to be taken into
27    account that generating invalid instructions may have ill effects on
28    tools like objdump, and may also have impact on the CPU speculative
29    execution efficiency in some cases.
30 
31    aarch64 -mbig-endian generates mixed endianness code vs data:
32    little-endian code and big-endian data.  Ensure the RSEQ_SIG signature
33    matches code endianness.  */
34 
35 #define RSEQ_SIG_CODE  0xd428bc00  /* BRK #0x45E0.  */
36 
37 #ifdef __AARCH64EB__
38 # define RSEQ_SIG_DATA 0x00bc28d4  /* BRK #0x45E0.  */
39 #else
40 # define RSEQ_SIG_DATA RSEQ_SIG_CODE
41 #endif
42 
43 #define RSEQ_SIG       RSEQ_SIG_DATA
44