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b168057a | 1 | /* Copyright (C) 2009-2015 Free Software Foundation, Inc. |
0d6bed71 CD |
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 | struct sigaltstack oss; \ | |
31 | INTERNAL_SYSCALL_DECL (err); \ | |
32 | int result = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss);\ | |
33 | /* If we aren't using an alternate stack then we have already \ | |
34 | shown that we are jumping to a frame that doesn't exist so \ | |
35 | error out. If we are using an alternate stack we must prove \ | |
36 | that we are jumping *out* of the alternate stack. Note that \ | |
37 | the check for that is the same as that for _STACK_GROWS_UP \ | |
38 | as for _STACK_GROWS_DOWN. */ \ | |
39 | if (!INTERNAL_SYSCALL_ERROR_P (result, err) \ | |
40 | && ((oss.ss_flags & SS_ONSTACK) == 0 \ | |
41 | || ((unsigned long) oss.ss_sp + oss.ss_size \ | |
42 | - (unsigned long) (sp)) < oss.ss_size)) \ | |
43 | __fortify_fail ("longjmp causes uninitialized stack frame"); \ | |
44 | } \ | |
45 | } while (0) | |
46 | ||
47 | #include <__longjmp.c> |