glibc/sysdeps/powerpc/stackinfo.h

/* Copyright (C) 1999-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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
   <http://www.gnu.org/licenses/>.  */

/* This file contains a bit of information about the stack allocation
   of the processor.  */

#ifndef _STACKINFO_H
#define _STACKINFO_H	1

#include <elf.h>

/* On PPC the stack grows down.  */
#define _STACK_GROWS_DOWN	1

#if __WORDSIZE == 64
/* PPC64 doesn't need an executable stack and doesn't need PT_GNU_STACK
 * to make the stack nonexecutable.  */
# define DEFAULT_STACK_PERMS (PF_R|PF_W)
#else
/* PF_X can be overridden if PT_GNU_STACK is present but is presumed absent.  */
# define DEFAULT_STACK_PERMS (PF_R|PF_W|PF_X)
#endif

#endif	/* stackinfo.h */