1*11efff7fSkettenis /* This testcase is part of GDB, the GNU debugger.
2*11efff7fSkettenis
3*11efff7fSkettenis Copyright 1996, 1999, 2003, 2004 Free Software Foundation, Inc.
4*11efff7fSkettenis
5*11efff7fSkettenis This program is free software; you can redistribute it and/or modify
6*11efff7fSkettenis it under the terms of the GNU General Public License as published by
7*11efff7fSkettenis the Free Software Foundation; either version 2 of the License, or
8*11efff7fSkettenis (at your option) any later version.
9*11efff7fSkettenis
10*11efff7fSkettenis This program is distributed in the hope that it will be useful,
11*11efff7fSkettenis but WITHOUT ANY WARRANTY; without even the implied warranty of
12*11efff7fSkettenis MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13*11efff7fSkettenis GNU General Public License for more details.
14*11efff7fSkettenis
15*11efff7fSkettenis You should have received a copy of the GNU General Public License
16*11efff7fSkettenis along with this program; if not, write to the Free Software
17*11efff7fSkettenis Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
18*11efff7fSkettenis 02111-1307, USA. */
19*11efff7fSkettenis
20*11efff7fSkettenis #include <signal.h>
21*11efff7fSkettenis #include <setjmp.h>
22*11efff7fSkettenis #include <stdlib.h>
23*11efff7fSkettenis #include <string.h>
24*11efff7fSkettenis
25*11efff7fSkettenis enum tests {
26*11efff7fSkettenis code_entry_point, code_descriptor, data_read, data_write
27*11efff7fSkettenis };
28*11efff7fSkettenis
29*11efff7fSkettenis static volatile enum tests test;
30*11efff7fSkettenis
31*11efff7fSkettenis /* Some basic types and zero buffers. */
32*11efff7fSkettenis
33*11efff7fSkettenis typedef long data_t;
34*11efff7fSkettenis typedef long code_t (void);
35*11efff7fSkettenis data_t *volatile data;
36*11efff7fSkettenis code_t *volatile code;
37*11efff7fSkettenis /* "desc" is intentionally initialized to a data object. This is
38*11efff7fSkettenis needed to test function descriptors on arches like ia64. */
39*11efff7fSkettenis data_t zero[10];
40*11efff7fSkettenis code_t *volatile desc = (code_t *) (void *) zero;
41*11efff7fSkettenis
42*11efff7fSkettenis sigjmp_buf env;
43*11efff7fSkettenis
44*11efff7fSkettenis extern void
keeper(int sig)45*11efff7fSkettenis keeper (int sig)
46*11efff7fSkettenis {
47*11efff7fSkettenis siglongjmp (env, 0);
48*11efff7fSkettenis }
49*11efff7fSkettenis
50*11efff7fSkettenis extern long
bowler(void)51*11efff7fSkettenis bowler (void)
52*11efff7fSkettenis {
53*11efff7fSkettenis switch (test)
54*11efff7fSkettenis {
55*11efff7fSkettenis case data_read:
56*11efff7fSkettenis /* Try to read address zero. */
57*11efff7fSkettenis return (*data);
58*11efff7fSkettenis case data_write:
59*11efff7fSkettenis /* Try to write (the assignment) to address zero. */
60*11efff7fSkettenis return (*data) = 1;
61*11efff7fSkettenis case code_entry_point:
62*11efff7fSkettenis /* For typical architectures, call a function at address
63*11efff7fSkettenis zero. */
64*11efff7fSkettenis return (*code) ();
65*11efff7fSkettenis case code_descriptor:
66*11efff7fSkettenis /* For atypical architectures that use function descriptors,
67*11efff7fSkettenis call a function descriptor, the code field of which is zero
68*11efff7fSkettenis (which has the effect of jumping to address zero). */
69*11efff7fSkettenis return (*desc) ();
70*11efff7fSkettenis }
71*11efff7fSkettenis }
72*11efff7fSkettenis
73*11efff7fSkettenis int
main()74*11efff7fSkettenis main ()
75*11efff7fSkettenis {
76*11efff7fSkettenis static volatile int i;
77*11efff7fSkettenis
78*11efff7fSkettenis struct sigaction act;
79*11efff7fSkettenis memset (&act, 0, sizeof act);
80*11efff7fSkettenis act.sa_handler = keeper;
81*11efff7fSkettenis sigaction (SIGSEGV, &act, NULL);
82*11efff7fSkettenis
83*11efff7fSkettenis for (i = 0; i < 10; i++)
84*11efff7fSkettenis {
85*11efff7fSkettenis sigsetjmp (env, 1);
86*11efff7fSkettenis bowler ();
87*11efff7fSkettenis }
88*11efff7fSkettenis }
89