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/* Copyright (C) 2011-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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 tile the stack grows down. */
#define _STACK_GROWS_DOWN 1
/* Default to a non-executable stack. */
#define DEFAULT_STACK_PERMS (PF_R|PF_W)
/* Access to the stack pointer. The macros are used in alloca_account
for which they need to act as barriers as well, hence the additional
(unnecessary) parameters. */
#define stackinfo_get_sp() \
({ void *p__; asm volatile ("move %0, sp" : "=r" (p__)); p__; })
#if defined __tilegx__ && __WORDSIZE == 32
#define __stackinfo_sub "subx"
#else
#define __stackinfo_sub "sub"
#endif
#define stackinfo_sub_sp(ptr) \
({ ptrdiff_t d__; \
asm volatile (__stackinfo_sub " %0, %0, sp" : "=r" (d__) : "0" (ptr)); \
d__; })
#endif /* stackinfo.h */
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