1  /* Pointer obfuscation implenentation.  s390 version.
       2     Copyright (C) 2005-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef POINTER_GUARD_H
      20  #define POINTER_GUARD_H
      21  
      22  #if IS_IN (rtld)
      23  /* We cannot use the thread descriptor because in ld.so we use setjmp
      24     earlier than the descriptor is initialized.  */
      25  # include <sysdeps/generic/pointer_guard.h>
      26  #else
      27  /* For the time being just use stack_guard rather than a separate
      28     pointer_guard.  */
      29  # ifdef __ASSEMBLER__
      30  #  define PTR_MANGLE(reg, tmpreg) \
      31    ear     tmpreg,%a0;                   \
      32    x       reg,STACK_GUARD(tmpreg)
      33  #  define PTR_MANGLE2(reg, tmpreg) \
      34    x       reg,STACK_GUARD(tmpreg)
      35  #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
      36  # else
      37  #  include <stdint.h>
      38  #  include <tls.h>
      39  #  define PTR_MANGLE(var) \
      40    (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
      41  #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
      42  # endif
      43  #endif
      44  
      45  #endif /* POINTER_GUARD_H */