1 | /* Copyright (C) 2003-2018 Free Software Foundation, Inc. |
---|---|
2 | This file is part of the GNU C Library. |
3 | Contributed by Jakub Jelinek <jakub@redhat.com>. |
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 License as |
7 | published by the Free Software Foundation; either version 2.1 of the |
8 | 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; see the file COPYING.LIB. If |
17 | not, see <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <dlfcn.h> |
20 | #include <stdio.h> |
21 | #include <unwind.h> |
22 | #include <gnu/lib-names.h> |
23 | #include <sysdep.h> |
24 | #include <unwind-resume.h> |
25 | |
26 | |
27 | void (*__libgcc_s_resume) (struct _Unwind_Exception *exc) |
28 | attribute_hidden __attribute__ ((noreturn)); |
29 | |
30 | static _Unwind_Reason_Code (*libgcc_s_personality) PERSONALITY_PROTO; |
31 | |
32 | void attribute_hidden __attribute__ ((cold)) |
33 | __libgcc_s_init (void) |
34 | { |
35 | void *resume, *personality; |
36 | void *handle; |
37 | |
38 | /* Use RTLD_NOW here for consistency with pthread_cancel_init. |
39 | RTLD_NOW will rarely make a difference here because unwinding is |
40 | already in progress, so libgcc_s.so has already been loaded if |
41 | its unwinder is used. */ |
42 | handle = __libc_dlopen_mode (LIBGCC_S_SO, RTLD_NOW | __RTLD_DLOPEN); |
43 | |
44 | if (handle == NULL |
45 | || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL |
46 | || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL) |
47 | __libc_fatal (LIBGCC_S_SO |
48 | " must be installed for unwinding to work\n"); |
49 | |
50 | #ifdef PTR_MANGLE |
51 | PTR_MANGLE (resume); |
52 | #endif |
53 | __libgcc_s_resume = resume; |
54 | #ifdef PTR_MANGLE |
55 | PTR_MANGLE (personality); |
56 | #endif |
57 | libgcc_s_personality = personality; |
58 | } |
59 | |
60 | #if !HAVE_ARCH_UNWIND_RESUME |
61 | void |
62 | _Unwind_Resume (struct _Unwind_Exception *exc) |
63 | { |
64 | if (__glibc_unlikely (__libgcc_s_resume == NULL)) |
65 | __libgcc_s_init (); |
66 | |
67 | __typeof (__libgcc_s_resume) resume = __libgcc_s_resume; |
68 | #ifdef PTR_DEMANGLE |
69 | PTR_DEMANGLE (resume); |
70 | #endif |
71 | (*resume) (exc); |
72 | } |
73 | #endif |
74 | |
75 | _Unwind_Reason_Code |
76 | __gcc_personality_v0 PERSONALITY_PROTO |
77 | { |
78 | if (__glibc_unlikely (libgcc_s_personality == NULL)) |
79 | __libgcc_s_init (); |
80 | |
81 | __typeof (libgcc_s_personality) personality = libgcc_s_personality; |
82 | #ifdef PTR_DEMANGLE |
83 | PTR_DEMANGLE (personality); |
84 | #endif |
85 | return (*personality) PERSONALITY_ARGS; |
86 | } |
87 |