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/* This testcase is part of GDB, the GNU debugger.
Copyright 1996-2019 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <signal.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
enum tests {
code_entry_point, code_descriptor, data_read, data_write
};
static volatile enum tests test;
/* Some basic types and zero buffers. */
typedef long data_t;
typedef long code_t (void);
data_t *volatile data;
code_t *volatile code;
/* "desc" is intentionally initialized to a data object. This is
needed to test function descriptors on arches like ia64. */
data_t zero[10];
code_t *volatile desc = (code_t *) (void *) zero;
sigjmp_buf env;
extern void
keeper (int sig)
{
siglongjmp (env, 0);
}
extern long
bowler (void)
{
switch (test)
{
case data_read:
/* Try to read address zero. */
return (*data);
case data_write:
/* Try to write (the assignment) to address zero. */
return (*data) = 1;
case code_entry_point:
/* For typical architectures, call a function at address
zero. */
return (*code) ();
case code_descriptor:
/* For atypical architectures that use function descriptors,
call a function descriptor, the code field of which is zero
(which has the effect of jumping to address zero). */
return (*desc) ();
}
}
int
main ()
{
static volatile int i;
struct sigaction act;
memset (&act, 0, sizeof act);
act.sa_handler = keeper;
sigaction (SIGSEGV, &act, NULL);
sigaction (SIGBUS, &act, NULL);
for (i = 0; i < 10; i++)
{
sigsetjmp (env, 1);
bowler ();
}
}
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