1 | /* Test setjmp interoperability with static dlopen BZ #21895. |
2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library 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 GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <setjmp.h> |
20 | #include <stdio.h> |
21 | #include <stdlib.h> |
22 | #include <dlfcn.h> |
23 | |
24 | /* Set TOC area pointed by sp to zero. */ |
25 | #define SET_TOC_TO_ZERO(sp) \ |
26 | ({ \ |
27 | unsigned int zero = 0; \ |
28 | asm volatile ("std %0, 24(%1)\n\t" :: "r" (zero), "r" (sp)); \ |
29 | }) |
30 | |
31 | static void |
32 | bar (jmp_buf jb, unsigned long sp) |
33 | { |
34 | static int i; |
35 | if (i++==1) |
36 | exit(0); /* Success. */ |
37 | |
38 | /* This will set TOC are on caller frame (foo) to zero. __longjmp |
39 | must restore r2 otherwise a segmentation fault will happens after |
40 | it jumps back to foo. */ |
41 | SET_TOC_TO_ZERO(sp); |
42 | longjmp(jb, i); |
43 | } |
44 | |
45 | static int |
46 | do_test (void) |
47 | { |
48 | void *h = dlopen(file: "setjmp-bug21895.so" , RTLD_NOW); |
49 | if (!h) |
50 | { |
51 | puts(s: dlerror()); |
52 | return 1; |
53 | } |
54 | |
55 | void (*pfoo)(void) = dlsym(handle: h, name: "foo" ); |
56 | if (!pfoo) |
57 | { |
58 | puts(s: dlerror()); |
59 | return 1; |
60 | } |
61 | |
62 | void (**ppbar)(jmp_buf, unsigned long) = dlsym(handle: h, name: "bar" ); |
63 | if (!ppbar) |
64 | { |
65 | puts(s: dlerror()); |
66 | return 1; |
67 | } |
68 | |
69 | *ppbar = bar; |
70 | pfoo(); |
71 | |
72 | for(;;); |
73 | } |
74 | |
75 | #include <support/test-driver.c> |
76 | |