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8bfabb04 AC |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
9d9030bc | 3 | Copyright 1996, 1999, 2003, 2004 Free Software Foundation, Inc. |
8bfabb04 AC |
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 2 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, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
18 | 02111-1307, USA. */ | |
19 | ||
20 | #include <signal.h> | |
21 | #include <setjmp.h> | |
725603e1 | 22 | #include <stdlib.h> |
9d9030bc | 23 | #include <string.h> |
8bfabb04 AC |
24 | |
25 | enum tests { | |
9d9030bc | 26 | code_entry_point, code_descriptor, data_read, data_write |
8bfabb04 AC |
27 | }; |
28 | ||
29 | static volatile enum tests test; | |
30 | ||
31 | /* Some basic types and zero buffers. */ | |
32 | ||
33 | typedef long data_t; | |
34 | typedef long code_t (void); | |
9d9030bc AC |
35 | data_t *volatile data; |
36 | code_t *volatile code; | |
37 | /* "desc" is intentionally initialized to a data object. This is | |
38 | needed to test function descriptors on arches like ia64. */ | |
39 | data_t zero[10]; | |
40 | code_t *volatile desc = (code_t *) (void *) zero; | |
8bfabb04 | 41 | |
8f5a3103 | 42 | sigjmp_buf env; |
8bfabb04 AC |
43 | |
44 | extern void | |
45 | keeper (int sig) | |
46 | { | |
725603e1 | 47 | siglongjmp (env, 0); |
8bfabb04 AC |
48 | } |
49 | ||
50 | extern long | |
51 | bowler (void) | |
52 | { | |
53 | switch (test) | |
54 | { | |
9d9030bc AC |
55 | case data_read: |
56 | /* Try to read address zero. */ | |
57 | return (*data); | |
58 | case data_write: | |
59 | /* Try to write (the assignment) to address zero. */ | |
60 | return (*data) = 1; | |
8bfabb04 | 61 | case code_entry_point: |
9d9030bc AC |
62 | /* For typical architectures, call a function at address |
63 | zero. */ | |
64 | return (*code) (); | |
8bfabb04 | 65 | case code_descriptor: |
9d9030bc AC |
66 | /* For atypical architectures that use function descriptors, |
67 | call a function descriptor, the code field of which is zero | |
68 | (which has the effect of jumping to address zero). */ | |
69 | return (*desc) (); | |
8bfabb04 AC |
70 | } |
71 | } | |
72 | ||
73 | int | |
74 | main () | |
75 | { | |
76 | static volatile int i; | |
725603e1 UW |
77 | |
78 | struct sigaction act; | |
79 | memset (&act, 0, sizeof act); | |
80 | act.sa_handler = keeper; | |
81 | sigaction (SIGSEGV, &act, NULL); | |
82 | ||
8bfabb04 AC |
83 | for (i = 0; i < 10; i++) |
84 | { | |
725603e1 | 85 | sigsetjmp (env, 1); |
8bfabb04 AC |
86 | bowler (); |
87 | } | |
88 | } |