mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-23 07:57:38 +01:00
30dec34c3a
2004/10/19 23:11:07-07:00 mostang.com!davidm
(got_here): New global variable.
(raise_exception): Fix off-by-2 error so that we _really_ step
to the outermost a() frame.
(get_bsp): New function.
(__builtin_ia64_bsp): Remove.
(a): Print stack and bsp addresses as we recurse.
When resuming execution in outermost a() frame (n==depth),
clear "result" and set "got_here" so we know we landed in
the right place.
(main): Don't accept arguments that cause "depth" to be < 1.
When returning from a(), also check "got_here". If
the check failed, print result, got_here, and nerrors
for diagnostic purposes.
(Logical change 1.290)
162 lines
3.6 KiB
C
162 lines
3.6 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2001-2004 Hewlett-Packard Co
|
|
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining
|
|
a copy of this software and associated documentation files (the
|
|
"Software"), to deal in the Software without restriction, including
|
|
without limitation the rights to use, copy, modify, merge, publish,
|
|
distribute, sublicense, and/or sell copies of the Software, and to
|
|
permit persons to whom the Software is furnished to do so, subject to
|
|
the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
|
|
/* This illustrates the basics of using the unwind interface for
|
|
exception handling. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include <libunwind.h>
|
|
|
|
#ifdef HAVE_IA64INTRIN_H
|
|
# include <ia64intrin.h>
|
|
#endif
|
|
|
|
#define panic(args...) \
|
|
{ ++nerrors; fprintf (stderr, args); }
|
|
|
|
int nerrors = 0;
|
|
int verbose = 0;
|
|
int depth = 13;
|
|
volatile int got_here = 0;
|
|
|
|
extern void b (int);
|
|
|
|
void
|
|
raise_exception (void)
|
|
{
|
|
unw_cursor_t cursor;
|
|
unw_context_t uc;
|
|
int i;
|
|
|
|
unw_getcontext (&uc);
|
|
if (unw_init_local (&cursor, &uc) < 0)
|
|
{
|
|
panic ("unw_init_local() failed!\n");
|
|
return;
|
|
}
|
|
|
|
/* unwind to top-most frame a(), skipping over b() and raise_exception(): */
|
|
for (i = 0; i < depth + 2; ++i)
|
|
if (unw_step (&cursor) < 0)
|
|
{
|
|
panic ("unw_step() failed!\n");
|
|
return;
|
|
}
|
|
unw_resume (&cursor); /* transfer control to exception handler */
|
|
}
|
|
|
|
uintptr_t
|
|
get_bsp (void)
|
|
{
|
|
#if UNW_TARGET_IA64
|
|
# ifdef __INTEL_COMPILER
|
|
return __getReg (_IA64_REG_AR_BSP);
|
|
# else
|
|
return (uintptr_t) __builtin_ia64_bsp ();
|
|
# endif
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int
|
|
a (int n)
|
|
{
|
|
long stack;
|
|
int result = 99;
|
|
|
|
if (verbose)
|
|
printf ("a(n=%d): sp=%p bsp=0x%lx\n",
|
|
n, &stack, (unsigned long) get_bsp ());
|
|
|
|
if (n > 0)
|
|
a (n - 1) + 1;
|
|
else
|
|
b (16);
|
|
|
|
if (verbose)
|
|
{
|
|
printf ("exception handler: here we go (sp=%p, bsp=0x%lx)...\n",
|
|
&stack, (unsigned long) get_bsp ());
|
|
/* This call works around a bug in gcc (up-to pre3.4) which
|
|
causes invalid assembly code to be generated when
|
|
__builtin_ia64_bsp() gets predicated. */
|
|
getpid ();
|
|
}
|
|
if (n == depth)
|
|
{
|
|
result = 0;
|
|
got_here = 1;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void
|
|
b (int n)
|
|
{
|
|
if ((n & 1) == 0)
|
|
{
|
|
if (verbose)
|
|
printf ("b(n=%d) calling raise_exception()\n", n);
|
|
raise_exception ();
|
|
}
|
|
panic ("FAILURE: b() returned from raise_exception()!!\n");
|
|
}
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
int result;
|
|
|
|
if (argc > 1)
|
|
{
|
|
++verbose;
|
|
depth = atol (argv[1]);
|
|
if (depth < 1)
|
|
{
|
|
fprintf (stderr, "Usage: %s depth\n"
|
|
" depth must be >= 1\n", argv[0]);
|
|
exit (-1);
|
|
}
|
|
}
|
|
|
|
result = a (depth);
|
|
if (result != 0 || !got_here || nerrors > 0)
|
|
{
|
|
fprintf (stderr,
|
|
"FAILURE: test failed: result=%d got_here=%d nerrors=%d\n",
|
|
result, got_here, nerrors);
|
|
exit (-1);
|
|
}
|
|
|
|
if (verbose)
|
|
printf ("SUCCESS!\n");
|
|
return 0;
|
|
}
|