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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
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Copyright (C) 2001-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/* This illustrates the basics of using the unwind interface for
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exception handling. */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libunwind.h>
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#ifdef HAVE_IA64INTRIN_H
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# include <ia64intrin.h>
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#endif
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#define panic(args...) \
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{ ++nerrors; fprintf (stderr, args); }
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int nerrors = 0;
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int verbose = 0;
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int depth = 13;
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volatile int got_here = 0;
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extern void b (int);
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void
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raise_exception (void)
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{
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unw_cursor_t cursor;
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unw_context_t uc;
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int i;
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unw_getcontext (&uc);
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if (unw_init_local (&cursor, &uc) < 0)
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{
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panic ("unw_init_local() failed!\n");
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return;
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}
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/* unwind to top-most frame a(), skipping over b() and raise_exception(): */
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for (i = 0; i < depth + 2; ++i)
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if (unw_step (&cursor) < 0)
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{
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panic ("unw_step() failed!\n");
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return;
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}
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unw_resume (&cursor); /* transfer control to exception handler */
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}
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uintptr_t
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get_bsp (void)
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{
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#if UNW_TARGET_IA64
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# ifdef __INTEL_COMPILER
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return __getReg (_IA64_REG_AR_BSP);
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# else
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return (uintptr_t) __builtin_ia64_bsp ();
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# endif
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#else
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return 0;
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#endif
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}
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int
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a (int n)
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{
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long stack;
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int result = 99;
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if (verbose)
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printf ("a(n=%d): sp=%p bsp=0x%lx\n",
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n, &stack, (unsigned long) get_bsp ());
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if (n > 0)
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a (n - 1) + 1;
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else
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b (16);
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if (verbose)
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{
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printf ("exception handler: here we go (sp=%p, bsp=0x%lx)...\n",
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&stack, (unsigned long) get_bsp ());
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/* This call works around a bug in gcc (up-to pre3.4) which
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causes invalid assembly code to be generated when
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__builtin_ia64_bsp() gets predicated. */
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getpid ();
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}
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if (n == depth)
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{
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result = 0;
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got_here = 1;
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}
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return result;
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}
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void
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b (int n)
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{
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if ((n & 1) == 0)
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{
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if (verbose)
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printf ("b(n=%d) calling raise_exception()\n", n);
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raise_exception ();
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}
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panic ("FAILURE: b() returned from raise_exception()!!\n");
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}
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int
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main (int argc, char **argv)
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{
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int result;
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if (argc > 1)
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{
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++verbose;
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depth = atol (argv[1]);
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if (depth < 1)
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{
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fprintf (stderr, "Usage: %s depth\n"
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" depth must be >= 1\n", argv[0]);
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exit (-1);
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}
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}
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result = a (depth);
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if (result != 0 || !got_here || nerrors > 0)
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{
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fprintf (stderr,
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"FAILURE: test failed: result=%d got_here=%d nerrors=%d\n",
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result, got_here, nerrors);
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exit (-1);
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}
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if (verbose)
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printf ("SUCCESS!\n");
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return 0;
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}
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