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92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2002 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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libunwind 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 2, or (at your option)
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any later version.
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libunwind 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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/* This illustrates the basics of using the unwind interface for
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exception handling. */
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#include <stdio.h>
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#include <stdlib.h>
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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int true = 1;
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static void
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raise_exception (void *addr)
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{
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unw_cursor_t cursor;
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unw_word_t ip;
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unw_context_t uc;
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unw_getcontext (&uc);
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if (unw_init_local (&cursor, &uc) < 0)
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panic ("unw_init_local() failed!\n");
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/* unwind to frame b(): */
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if (unw_step (&cursor) < 0)
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panic ("unw_step() failed!\n");
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/* unwind to frame a(): */
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if (unw_step (&cursor) < 0)
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panic ("unw_step() failed!\n");
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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printf ("ip = %lx\n", ip);
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if (unw_set_reg (&cursor, UNW_REG_IP, (unw_word_t) addr) < 0)
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panic ("unw_set_reg() failed!\n");
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unw_resume (&cursor); /* transfer control to exception handler */
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}
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static void
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b (void *addr)
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{
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printf ("b() calling raise_exception()\n");
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raise_exception (addr);
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printf ("b(): back from raise_exception!!\n");
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}
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static int
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a (void)
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{
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register long sp asm ("r12");
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printf("a: sp=%lx bsp=%p\n", sp, __builtin_ia64_bsp ());
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b (&&handler);
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printf ("unexpected return from func()!\n");
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if (true)
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return -1;
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handler:
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printf ("exception handler: here we go (sp=%lx, bsp=%p)...\n",
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sp, __builtin_ia64_bsp ());
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return 0;
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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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if (a () == 0)
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printf ("test succeeded!\n");
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else
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printf ("bummer: test failed; try again?\n");
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return 0;
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}
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