sysdeps/unix/sysv/linux/s390/s390-64/____longjmp_chk.c

   1 /* Copyright (C) 2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <sysdep.h>
  22 #include <setjmp.h>
  23 #include <bits/setjmp.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <stdint.h>
  28 #include <signal.h>
  29 #include <sys/syscall.h>
  30
  31 #define __longjmp ____longjmp_chk
  32
  33 #define CHECK_SP(env, guard) \
  34   do                                                                    \
  35     {                                                                   \
  36       uintptr_t cur_sp;                                                 \
  37       uintptr_t new_sp = env->__gregs[9];                               \
  38       __asm ("lgr %0, %%r15" : "=r" (cur_sp));                          \
  39       new_sp ^= guard;                                                  \
  40       if (new_sp < cur_sp)                                              \
  41         {                                                               \
  42           stack_t oss;                                                  \
  43           INTERNAL_SYSCALL_DECL (err);                                  \
  44           int res = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss); \
  45           if (!INTERNAL_SYSCALL_ERROR_P (res, err))                     \
  46             {                                                           \
  47               if ((oss.ss_flags & SS_ONSTACK) == 0                      \
  48                   || ((uintptr_t) (oss.ss_sp + oss.ss_size) - new_sp    \
  49                       < oss.ss_size))                                   \
  50                 __fortify_fail ("longjmp causes uninitialized stack frame");\
  51             }                                                           \
  52         }                                                               \
  53     } while (0)
  54
  55 #include "__longjmp.c"