glibc (2.38)

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       1  /* Restartable Sequences Linux x86 architecture header.
       2     Copyright (C) 2021-2023 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     RSEQ_SIG is used with the following reserved undefined instructions, which
      25     trap in user-space:
      26  
      27     x86-32:    0f b9 3d 53 30 05 53      ud1    0x53053053,%edi
      28     x86-64:    0f b9 3d 53 30 05 53      ud1    0x53053053(%rip),%edi  */
      29  
      30  #define RSEQ_SIG        0x53053053