ports/sysdeps/unix/sysv/linux/mips/____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 Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <signal.h>
  19 #include <stdio.h>
  20 #define __longjmp ____longjmp_chk
  21 #define CHECK_SP(saved_sp, cur_sp, sp_type)                             \
  22   do {                                                                  \
  23     sp_type sp_saved = (sp_type) (saved_sp);                            \
  24     if (sp_saved < (cur_sp))                                            \
  25       {                                                                 \
  26         struct __jmp_buf_internal_tag *env_save = env_arg;              \
  27         int val_save = val_arg;                                         \
  28         stack_t ss;                                                     \
  29         int ret = __sigaltstack (NULL, &ss);                            \
  30         if (ret == 0                                                    \
  31             && (!(ss.ss_flags & SS_ONSTACK)                             \
  32                 || ((unsigned sp_type) ((sp_type) (long) ss.ss_sp       \
  33                                         + (sp_type) ss.ss_size          \
  34                                         - sp_saved)                     \
  35                     < ss.ss_size)))                                     \
  36           __fortify_fail ("longjmp causes uninitialized stack frame");  \
  37         asm volatile ("move %0, %1" : "=r" (env) : "r" (env_save));     \
  38         asm volatile ("move %0, %1" : "=r" (val) : "r" (val_save));     \
  39       }                                                                 \
  40   } while (0)
  41 #include <__longjmp.c>