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 <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>