1  /* Copyright (C) 2009-2023 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     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <stdio.h>
      19  #include <signal.h>
      20  #include <sysdep.h>
      21  #define __longjmp ____longjmp_chk
      22  #define CHECK_SP(sp)							      \
      23    do {									      \
      24      register unsigned long this_sp asm ("sp");				      \
      25      if ((unsigned long) (sp) < this_sp)					      \
      26        {									      \
      27  	stack_t oss;							      \
      28  	int result = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss);         \
      29  	if (!INTERNAL_SYSCALL_ERROR_P (result)				      \
      30  	    && ((oss.ss_flags & SS_ONSTACK) == 0			      \
      31  		|| ((unsigned long) oss.ss_sp + oss.ss_size		      \
      32  		    - (unsigned long) (sp)) < oss.ss_size))		      \
      33  	  __fortify_fail ("longjmp causes uninitialized stack frame");	      \
      34        }									      \
      35    } while (0)
      36  
      37  #include <__longjmp.c>