1 /* Copyright (C) 1999-2022 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 */ 39