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92 lines
2.6 KiB
C
92 lines
2.6 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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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 shows how to use the unwind interface to modify any ancestor
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frame while still returning to the parent frame. */
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <libunwind-ia64.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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static void
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sighandler (int signal)
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{
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unw_cursor_t cursor, cursor2;
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unw_word_t ip;
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unw_context_t uc;
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printf ("caught signal %d\n", signal);
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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() failed!\n");
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/* get cursor for caller of sighandler: */
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if (unw_step (&cursor) < 0)
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panic ("unw_step() failed!\n");
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cursor2 = cursor;
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while (!unw_is_signal_frame (&cursor2))
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if (unw_step (&cursor2) < 0)
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panic ("failed to find signal frame!\n");
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if (unw_step (&cursor2) < 0)
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panic ("unw_step() failed!\n");
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if (unw_get_reg (&cursor2, UNW_REG_IP, &ip) < 0)
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panic ("failed to get IP!\n");
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/* skip faulting instruction (doesn't handle MLX template) */
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++ip;
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if ((ip & 0x3) == 0x3)
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ip += 13;
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if (unw_set_reg (&cursor2, UNW_REG_IP, ip) < 0)
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panic ("failed to set IP!\n");
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unw_resume (&cursor); /* update context & return to caller of sighandler() */
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panic ("unexpected return from unw_resume()!\n");
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}
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static void
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doit (volatile char *p)
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{
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int ch;
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ch = *p; /* trigger SIGSEGV */
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printf ("doit: finishing execution!\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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signal (SIGSEGV, sighandler);
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doit (0);
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}
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