1 /* Copyright (C) 2009-2022 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 stack_t oss; \ 31 int result = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss);\ 32 /* If we aren't using an alternate stack then we have already \ 33 shown that we are jumping to a frame that doesn't exist so \ 34 error out. If we are using an alternate stack we must prove \ 35 that we are jumping *out* of the alternate stack. Note that \ 36 the check for that is the same as that for _STACK_GROWS_UP \ 37 as for _STACK_GROWS_DOWN. */ \ 38 if (!INTERNAL_SYSCALL_ERROR_P (result) \ 39 && ((oss.ss_flags & SS_ONSTACK) == 0 \ 40 || ((unsigned long) oss.ss_sp + oss.ss_size \ 41 - (unsigned long) (sp)) < oss.ss_size)) \ 42 __fortify_fail ("longjmp causes uninitialized stack frame"); \ 43 } \ 44 } while (0) 45 46 #include <__longjmp.c> 47