| 1 | /* Copyright (C) 2009-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with GCC; see the file COPYING. If not, write to the Free |
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| 16 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
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| 17 | 02110-1301, USA. */ |
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| 18 | |
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| 19 | #include <stdio.h> |
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| 20 | #include <signal.h> |
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| 21 | #include <sysdep.h> |
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| 22 | #define __longjmp ____longjmp_chk |
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| 23 | #define CHECK_SP(sp) \ |
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| 24 | do { \ |
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| 25 | register unsigned long this_sp asm ("r30"); \ |
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| 26 | /* The stack grows up, therefore frames that were created and then \ |
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| 27 | destroyed must all have stack values higher than ours. */ \ |
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| 28 | if ((unsigned long) (sp) > this_sp) \ |
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| 29 | { \ |
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| 30 | stack_t oss; \ |
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| 31 | int result = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss);\ |
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| 32 | /* If we aren't using an alternate stack then we have already \ |
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| 33 | shown that we are jumping to a frame that doesn't exist so \ |
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| 34 | error out. If we are using an alternate stack we must prove \ |
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| 35 | that we are jumping *out* of the alternate stack. Note that \ |
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| 36 | the check for that is the same as that for _STACK_GROWS_UP \ |
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| 37 | as for _STACK_GROWS_DOWN. */ \ |
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| 38 | if (!INTERNAL_SYSCALL_ERROR_P (result) \ |
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| 39 | && ((oss.ss_flags & SS_ONSTACK) == 0 \ |
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| 40 | || ((unsigned long) oss.ss_sp + oss.ss_size \ |
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| 41 | - (unsigned long) (sp)) < oss.ss_size)) \ |
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| 42 | __fortify_fail ("longjmp causes uninitialized stack frame"); \ |
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| 43 | } \ |
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| 44 | } while (0) |
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| 45 | |
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| 46 | #include <__longjmp.c> |
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| 47 | |
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