1  /* Copyright (C) 1999-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       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  /* This file contains a bit of information about the stack allocation
      19     of the processor.  */
      20  
      21  #ifndef _STACKINFO_H
      22  #define _STACKINFO_H	1
      23  
      24  #include <elf.h>
      25  
      26  /* On PPC the stack grows down.  */
      27  #define _STACK_GROWS_DOWN	1
      28  
      29  #if __WORDSIZE == 64
      30  /* PPC64 doesn't need an executable stack and doesn't need PT_GNU_STACK
      31   * to make the stack nonexecutable.  */
      32  # define DEFAULT_STACK_PERMS (PF_R|PF_W)
      33  #else
      34  /* PF_X can be overridden if PT_GNU_STACK is present but is presumed absent.  */
      35  # define DEFAULT_STACK_PERMS (PF_R|PF_W|PF_X)
      36  #endif
      37  
      38  #endif	/* stackinfo.h */