]>
Commit | Line | Data |
---|---|---|
938f0e2f AB |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright 2014-2015 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 *global_invalid_ptr = NULL; | |
24 | ||
25 | void | |
26 | func2 (void) | |
27 | { | |
28 | /* Replace the current stack pointer and frame pointer with the invalid | |
29 | pointer. */ | |
30 | asm ("mov %0, %%rsp\n\tmov %0, %%rbp" : : "r" (global_invalid_ptr)); | |
31 | ||
32 | /* Create a label for a breakpoint. */ | |
33 | asm (".global breakpt\nbreakpt:"); | |
34 | } | |
35 | ||
36 | void | |
37 | func1 (void *ptr) | |
38 | { | |
39 | global_invalid_ptr = ptr; | |
40 | func2 (); | |
41 | } | |
42 | ||
43 | /* Finds and returns an invalid pointer, mmaps in a page, grabs a pointer | |
44 | to it then unmaps the page again. This is almost certainly "undefined" | |
45 | behaviour, but should be good enough for this small test program. */ | |
46 | ||
47 | static void * | |
48 | make_invalid_ptr (void) | |
49 | { | |
50 | int page_size, ans; | |
51 | void *ptr; | |
52 | ||
53 | page_size = getpagesize (); | |
54 | ptr = mmap (0, page_size, PROT_NONE, | |
55 | MAP_PRIVATE | MAP_ANONYMOUS, | |
56 | -1, 0); | |
57 | assert (ptr != MAP_FAILED); | |
58 | ans = munmap (ptr, page_size); | |
59 | assert (ans == 0); | |
60 | ||
61 | return ptr; | |
62 | } | |
63 | ||
64 | int | |
65 | main (void) | |
66 | { | |
67 | void *invalid_ptr; | |
68 | ||
69 | invalid_ptr = make_invalid_ptr (); | |
70 | func1 (invalid_ptr); | |
71 | ||
72 | return 0; | |
73 | } |