| 1 | /* This testcase is part of GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 1996-2013 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <signal.h> |
| 19 | #include <setjmp.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | |
| 23 | enum tests { |
| 24 | code_entry_point, code_descriptor, data_read, data_write |
| 25 | }; |
| 26 | |
| 27 | static volatile enum tests test; |
| 28 | |
| 29 | /* Some basic types and zero buffers. */ |
| 30 | |
| 31 | typedef long data_t; |
| 32 | typedef long code_t (void); |
| 33 | data_t *volatile data; |
| 34 | code_t *volatile code; |
| 35 | /* "desc" is intentionally initialized to a data object. This is |
| 36 | needed to test function descriptors on arches like ia64. */ |
| 37 | data_t zero[10]; |
| 38 | code_t *volatile desc = (code_t *) (void *) zero; |
| 39 | |
| 40 | sigjmp_buf env; |
| 41 | |
| 42 | extern void |
| 43 | keeper (int sig) |
| 44 | { |
| 45 | siglongjmp (env, 0); |
| 46 | } |
| 47 | |
| 48 | extern long |
| 49 | bowler (void) |
| 50 | { |
| 51 | switch (test) |
| 52 | { |
| 53 | case data_read: |
| 54 | /* Try to read address zero. */ |
| 55 | return (*data); |
| 56 | case data_write: |
| 57 | /* Try to write (the assignment) to address zero. */ |
| 58 | return (*data) = 1; |
| 59 | case code_entry_point: |
| 60 | /* For typical architectures, call a function at address |
| 61 | zero. */ |
| 62 | return (*code) (); |
| 63 | case code_descriptor: |
| 64 | /* For atypical architectures that use function descriptors, |
| 65 | call a function descriptor, the code field of which is zero |
| 66 | (which has the effect of jumping to address zero). */ |
| 67 | return (*desc) (); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | int |
| 72 | main () |
| 73 | { |
| 74 | static volatile int i; |
| 75 | |
| 76 | struct sigaction act; |
| 77 | memset (&act, 0, sizeof act); |
| 78 | act.sa_handler = keeper; |
| 79 | sigaction (SIGSEGV, &act, NULL); |
| 80 | sigaction (SIGBUS, &act, NULL); |
| 81 | |
| 82 | for (i = 0; i < 10; i++) |
| 83 | { |
| 84 | sigsetjmp (env, 1); |
| 85 | bowler (); |
| 86 | } |
| 87 | } |