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libunwind-eh_elf/tests/sig.c
mostang.com!davidm e324c4c115 Include <libunwind-ia64.h> instead of <libunwind.h> (this program is slightly
ia64-specific).
(sighandler): Rename rp to ip.
(doit): Declare argument as volatile pointer.

(Logical change 1.18)
2002-04-25 06:47:29 +00:00

84 lines
2.1 KiB
C

/* libunwind - a platform-independent unwind library
Copyright (C) 2001-2002 Hewlett-Packard Co
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of libunwind.
libunwind is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
libunwind is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details. */
/* This shows how to use the unwind interface to modify any ancestor
frame while still returning to the parent frame. */
#include <signal.h>
#include <stdio.h>
#include <libunwind-ia64.h>
#define panic(args...) \
{ fprintf (stderr, args); exit (-1); }
static void
sighandler (int signal)
{
unw_cursor_t cursor, cursor2;
unw_word_t ip;
unw_context_t uc;
printf ("caught signal %d\n", signal);
unw_getcontext (&uc);
if (unw_init_local (&cursor, &uc) < 0)
panic ("unw_init() failed!\n");
/* get cursor for caller of sighandler: */
if (unw_step (&cursor) < 0)
panic ("unw_step() failed!\n");
cursor2 = cursor;
while (!unw_is_signal_frame (&cursor2))
if (unw_step (&cursor2) < 0)
panic ("failed to find signal frame!\n");
if (unw_step (&cursor2) < 0)
panic ("unw_step() failed!\n");
if (unw_get_reg (&cursor2, UNW_REG_IP, &ip) < 0)
panic ("failed to get IP!\n");
/* skip faulting instruction (doesn't handle MLX template) */
++ip;
if (ip & 0x3 == 0x3)
ip += 13;
if (unw_set_reg (&cursor2, UNW_REG_IP, ip) < 0)
panic ("failed to set IP!\n");
unw_resume (&cursor); /* update context & return to caller of sighandler() */
panic ("unexpected return from unw_resume()!\n");
}
static void
doit (volatile char *p)
{
int ch;
ch = *p; /* trigger SIGSEGV */
printf ("doit: finishing execution!\n");
}
int
main (int argc, char **argv)
{
signal (SIGSEGV, sighandler);
doit (0);
}