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938f0e2f AB |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
618f726f | 3 | Copyright 2014-2016 Free Software Foundation, Inc. |
938f0e2f AB |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <sys/mman.h> | |
20 | #include <unistd.h> | |
21 | #include <assert.h> | |
22 | ||
23 | void | |
24 | breakpt (void) | |
25 | { | |
26 | /* Nothing. */ | |
27 | } | |
28 | ||
29 | void | |
30 | func5 (void) | |
31 | { | |
32 | breakpt (); | |
33 | } | |
34 | ||
35 | void | |
36 | func4 (void) | |
37 | { | |
38 | func5 (); | |
39 | } | |
40 | ||
41 | void | |
42 | func3 (void) | |
43 | { | |
44 | func4 (); | |
45 | } | |
46 | ||
47 | void | |
48 | func2 (void *ptr) | |
49 | { | |
50 | func3 (); | |
51 | } | |
52 | ||
53 | void | |
54 | func1 (void *ptr) | |
55 | { | |
56 | func2 (ptr); | |
57 | } | |
58 | ||
59 | /* Finds and returns an invalid pointer, mmaps in a page, grabs a pointer | |
60 | to it then unmaps the page again. This is almost certainly "undefined" | |
61 | behaviour, but should be good enough for this small test program. */ | |
62 | ||
63 | static void * | |
64 | make_invalid_ptr (void) | |
65 | { | |
66 | int page_size, ans; | |
67 | void *ptr; | |
68 | ||
69 | page_size = getpagesize (); | |
70 | ptr = mmap (0, page_size, PROT_NONE, | |
71 | MAP_PRIVATE | MAP_ANONYMOUS, | |
72 | -1, 0); | |
73 | assert (ptr != MAP_FAILED); | |
74 | ans = munmap (ptr, page_size); | |
75 | assert (ans == 0); | |
76 | ||
77 | return ptr; | |
78 | } | |
79 | ||
80 | int | |
81 | main (void) | |
82 | { | |
83 | void *invalid_ptr; | |
84 | ||
85 | invalid_ptr = make_invalid_ptr (); | |
86 | func1 (invalid_ptr); | |
87 | ||
88 | return 0; | |
89 | } |