1 /* libunwind - a platform-independent unwind library
2    Copyright (C) 2003-2004 Hewlett-Packard Co
3 	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4 
5 This file is part of libunwind.
6 
7 Copyright (c) 2003 Hewlett-Packard Co.
8 
9 Permission is hereby granted, free of charge, to any person obtaining
10 a copy of this software and associated documentation files (the
11 "Software"), to deal in the Software without restriction, including
12 without limitation the rights to use, copy, modify, merge, publish,
13 distribute, sublicense, and/or sell copies of the Software, and to
14 permit persons to whom the Software is furnished to do so, subject to
15 the following conditions:
16 
17 The above copyright notice and this permission notice shall be
18 included in all copies or substantial portions of the Software.
19 
20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
27 
28 #include "compiler.h"
29 
30 #include <libunwind.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <unistd.h>
35 
36 #include <sys/resource.h>
37 
38 #define panic(args...)				\
39 	{ fprintf (stderr, args); exit (-1); }
40 
41 int verbose;
42 
43 static void
44 do_backtrace (void)
45 {
46   unw_cursor_t cursor;
47   unw_word_t ip, sp;
48   unw_context_t uc;
49   int ret;
50 
51   unw_getcontext (&uc);
52   if (unw_init_local (&cursor, &uc) < 0)
53     panic ("unw_init_local failed!\n");
54 
55   do
56     {
57       unw_get_reg (&cursor, UNW_REG_IP, &ip);
58       unw_get_reg (&cursor, UNW_REG_SP, &sp);
59 
60       if (verbose)
61 	printf ("%016lx (sp=%016lx)\n", (long) ip, (long) sp);
62 
63       ret = unw_step (&cursor);
64       if (ret < 0)
65 	{
66 	  unw_get_reg (&cursor, UNW_REG_IP, &ip);
67 	  panic ("FAILURE: unw_step() returned %d for ip=%lx\n",
68 		 ret, (long) ip);
69 	}
70     }
71   while (ret > 0);
72 }
73 
74 int
75 consume_some_stack_space (void)
76 {
77   unw_cursor_t cursor;
78   unw_context_t uc;
79   char string[1024];
80 
81   memset (&cursor, 0, sizeof (cursor));
82   memset (&uc, 0, sizeof (uc));
83   return sprintf (string, "hello %p %p\n", &cursor, &uc);
84 }
85 
86 int
87 main (int argc, char **argv UNUSED)
88 {
89   struct rlimit rlim;
90 
91   verbose = argc > 1;
92 
93   if (consume_some_stack_space () > 9999)
94     exit (-1);	/* can't happen, but don't let the compiler know... */
95 
96   rlim.rlim_cur = 0;
97   rlim.rlim_max = RLIM_INFINITY;
98   setrlimit (RLIMIT_DATA, &rlim);
99   setrlimit (RLIMIT_AS, &rlim);
100 
101   do_backtrace ();
102   return 0;
103 }
104