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88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 1996-2015 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#include <string.h>
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enum tests {
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code_entry_point, code_descriptor, data_read, data_write
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};
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static volatile enum tests test;
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/* Some basic types and zero buffers. */
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typedef long data_t;
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typedef long code_t (void);
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data_t *volatile data;
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code_t *volatile code;
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/* "desc" is intentionally initialized to a data object. This is
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needed to test function descriptors on arches like ia64. */
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data_t zero[10];
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code_t *volatile desc = (code_t *) (void *) zero;
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sigjmp_buf env;
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extern void
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keeper (int sig)
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{
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siglongjmp (env, 0);
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}
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extern long
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bowler (void)
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{
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switch (test)
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{
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case data_read:
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/* Try to read address zero. */
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return (*data);
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case data_write:
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/* Try to write (the assignment) to address zero. */
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return (*data) = 1;
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case code_entry_point:
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/* For typical architectures, call a function at address
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zero. */
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return (*code) ();
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case code_descriptor:
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/* For atypical architectures that use function descriptors,
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call a function descriptor, the code field of which is zero
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(which has the effect of jumping to address zero). */
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return (*desc) ();
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}
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}
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int
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main ()
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{
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static volatile int i;
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struct sigaction act;
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memset (&act, 0, sizeof act);
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act.sa_handler = keeper;
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sigaction (SIGSEGV, &act, NULL);
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sigaction (SIGBUS, &act, NULL);
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for (i = 0; i < 10; i++)
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{
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sigsetjmp (env, 1);
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bowler ();
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}
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}
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