mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-23 20:03:43 +01:00
91 lines
2.1 KiB
C
91 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 illustrates the basics of using the unwind interface for
|
|
exception handling. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#define UNW_LOCAL_ONLY
|
|
#include <libunwind.h>
|
|
|
|
#define panic(args...) \
|
|
{ fprintf (stderr, args); exit (-1); }
|
|
|
|
int true = 1;
|
|
|
|
static void
|
|
raise_exception (void *addr)
|
|
{
|
|
unw_cursor_t cursor;
|
|
unw_word_t ip;
|
|
unw_context_t uc;
|
|
|
|
unw_getcontext (&uc);
|
|
if (unw_init_local (&cursor, &uc) < 0)
|
|
panic ("unw_init_local() failed!\n");
|
|
|
|
/* unwind to frame b(): */
|
|
if (unw_step (&cursor) < 0)
|
|
panic ("unw_step() failed!\n");
|
|
|
|
/* unwind to frame a(): */
|
|
if (unw_step (&cursor) < 0)
|
|
panic ("unw_step() failed!\n");
|
|
|
|
unw_get_reg (&cursor, UNW_REG_IP, &ip);
|
|
printf ("ip = %lx\n", ip);
|
|
|
|
if (unw_set_reg (&cursor, UNW_REG_IP, (unw_word_t) addr) < 0)
|
|
panic ("unw_set_reg() failed!\n");
|
|
|
|
unw_resume (&cursor); /* transfer control to exception handler */
|
|
}
|
|
|
|
static void
|
|
b (void *addr)
|
|
{
|
|
printf ("b() calling raise_exception()\n");
|
|
raise_exception (addr);
|
|
}
|
|
|
|
static int
|
|
a (void)
|
|
{
|
|
register long sp asm ("r12");
|
|
printf("a: sp=%lx bsp=%p\n", sp, __builtin_ia64_bsp ());
|
|
b (&&handler);
|
|
printf ("unexpected return from func()!\n");
|
|
|
|
if (true)
|
|
return -1;
|
|
|
|
handler:
|
|
printf ("exception handler: here we go (sp=%lx, bsp=%p)...\n",
|
|
sp, __builtin_ia64_bsp ());
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
if (a () == 0)
|
|
printf ("test succeeded!\n");
|
|
else
|
|
printf ("bummer: test failed; try again?\n");
|
|
return 0;
|
|
}
|