ports/sysdeps/unix/sysv/linux/hppa/____longjmp_chk.c

   1 /* Copyright (C) 2009-2014 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 General Public License
  15    along with GCC; see the file COPYING.  If not, write to the Free
  16    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  17    02110-1301, USA.  */
  18
  19 #include <stdio.h>
  20 #include <signal.h>
  21 #include <sysdep.h>
  22 #define __longjmp ____longjmp_chk
  23 #define CHECK_SP(sp)                                                    \
  24   do {                                                                  \
  25     register unsigned long this_sp asm ("r30");                         \
  26     /* The stack grows up, therefore frames that were created and then  \
  27        destroyed must all have stack values higher than ours.  */       \
  28     if ((unsigned long) (sp) > this_sp)                                 \
  29       {                                                                 \
  30         struct sigaltstack oss;                                         \
  31         INTERNAL_SYSCALL_DECL (err);                                    \
  32         int result = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss);\
  33         /* If we aren't using an alternate stack then we have already   \
  34            shown that we are jumping to a frame that doesn't exist so   \
  35            error out. If we are using an alternate stack we must prove  \
  36            that we are jumping *out* of the alternate stack. Note that  \
  37            the check for that is the same as that for _STACK_GROWS_UP   \
  38            as for _STACK_GROWS_DOWN.  */                                \
  39         if (!INTERNAL_SYSCALL_ERROR_P (result, err)                     \
  40             && ((oss.ss_flags & SS_ONSTACK) == 0                        \
  41                 || ((unsigned long) oss.ss_sp + oss.ss_size             \
  42                     - (unsigned long) (sp)) < oss.ss_size))             \
  43           __fortify_fail ("longjmp causes uninitialized stack frame");  \
  44       }                                                                 \
  45   } while (0)
  46
  47 #include <__longjmp.c>