mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-02 16:19:26 +01:00
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2001-2003 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 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 <stdlib.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);
|
|
return 0;
|
|
}
|