2015-01-02 16:28:19 +00:00
|
|
|
/* Copyright (C) 2009-2015 Free Software Foundation, Inc.
|
2012-11-19 05:36:08 +00:00
|
|
|
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 General Public License
|
|
|
|
|
along with GCC; see the file COPYING. If not, write to the Free
|
|
|
|
|
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
|
|
|
|
|
02110-1301, USA. */
|
|
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
|
#include <signal.h>
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
#define __longjmp ____longjmp_chk
|
|
|
|
|
#define CHECK_SP(sp) \
|
|
|
|
|
do { \
|
|
|
|
|
register unsigned long this_sp asm ("r30"); \
|
|
|
|
|
/* The stack grows up, therefore frames that were created and then \
|
|
|
|
|
destroyed must all have stack values higher than ours. */ \
|
|
|
|
|
if ((unsigned long) (sp) > this_sp) \
|
|
|
|
|
{ \
|
|
|
|
|
struct sigaltstack oss; \
|
|
|
|
|
INTERNAL_SYSCALL_DECL (err); \
|
|
|
|
|
int result = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss);\
|
|
|
|
|
/* If we aren't using an alternate stack then we have already \
|
|
|
|
|
shown that we are jumping to a frame that doesn't exist so \
|
|
|
|
|
error out. If we are using an alternate stack we must prove \
|
|
|
|
|
that we are jumping *out* of the alternate stack. Note that \
|
|
|
|
|
the check for that is the same as that for _STACK_GROWS_UP \
|
|
|
|
|
as for _STACK_GROWS_DOWN. */ \
|
|
|
|
|
if (!INTERNAL_SYSCALL_ERROR_P (result, err) \
|
|
|
|
|
&& ((oss.ss_flags & SS_ONSTACK) == 0 \
|
|
|
|
|
|| ((unsigned long) oss.ss_sp + oss.ss_size \
|
|
|
|
|
- (unsigned long) (sp)) < oss.ss_size)) \
|
|
|
|
|
__fortify_fail ("longjmp causes uninitialized stack frame"); \
|
|
|
|
|
} \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
#include <__longjmp.c>
|
