1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2001-2004 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5Permission is hereby granted, free of charge, to any person obtaining
6a copy of this software and associated documentation files (the
7"Software"), to deal in the Software without restriction, including
8without limitation the rights to use, copy, modify, merge, publish,
9distribute, sublicense, and/or sell copies of the Software, and to
10permit persons to whom the Software is furnished to do so, subject to
11the following conditions:
12
13The above copyright notice and this permission notice shall be
14included in all copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
23
24/* This test uses the unwind interface to modify the IP in an ancestor
25   frame while still returning to the parent frame.  */
26
27#include <signal.h>
28#include <stdio.h>
29#include <stdlib.h>
30
31#include <libunwind-ia64.h>
32
33#define panic(args...)				\
34	{ fprintf (stderr, args); exit (-1); }
35
36int verbose;
37
38static void
39sighandler (int signal)
40{
41  unw_cursor_t cursor, cursor2;
42  unw_word_t ip;
43  unw_context_t uc;
44
45  if (verbose)
46    printf ("caught signal %d\n", signal);
47
48  unw_getcontext (&uc);
49  if (unw_init_local (&cursor, &uc) < 0)
50    panic ("unw_init() failed!\n");
51
52  /* get cursor for caller of sighandler: */
53  if (unw_step (&cursor) < 0)
54    panic ("unw_step() failed!\n");
55
56  cursor2 = cursor;
57  while (!unw_is_signal_frame (&cursor2))
58    if (unw_step (&cursor2) < 0)
59      panic ("failed to find signal frame!\n");
60
61  if (unw_step (&cursor2) < 0)
62    panic ("unw_step() failed!\n");
63
64  if (unw_get_reg (&cursor2, UNW_REG_IP, &ip) < 0)
65    panic ("failed to get IP!\n");
66
67  /* skip faulting instruction (doesn't handle MLX template) */
68  ++ip;
69  if ((ip & 0x3) == 0x3)
70    ip += 13;
71
72  if (unw_set_reg (&cursor2, UNW_REG_IP, ip) < 0)
73    panic ("failed to set IP!\n");
74
75  unw_resume (&cursor);	/* update context & return to caller of sighandler() */
76
77  panic ("unexpected return from unw_resume()!\n");
78}
79
80static void
81doit (volatile char *p)
82{
83  int ch;
84
85  ch = *p;	/* trigger SIGSEGV */
86
87  if (verbose)
88    printf ("doit: finishing execution!\n");
89}
90
91int
92main (int argc, char **argv)
93{
94  if (argc > 1)
95    verbose = 1;
96
97  signal (SIGSEGV, sighandler);
98  doit (0);
99  if (verbose)
100    printf ("SUCCESS\n");
101  return 0;
102}
103