]>
Commit | Line | Data |
---|---|---|
9fc813e1 | 1 | /* Dynamic loading of the libgcc unwinder. Generic version. |
6d7e8eda | 2 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
9fc813e1 FW |
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 | #ifndef _UNWIND_LINK_H | |
20 | #define _UNWIND_LINK_H | |
21 | ||
22 | #include <unwind.h> | |
23 | #include <unwind-arch.h> | |
24 | ||
25 | #if !UNWIND_LINK_FRAME_ADJUSTMENT | |
26 | static inline void * | |
27 | unwind_arch_adjustment (void *prev, void *addr) | |
28 | { | |
29 | return addr; | |
30 | } | |
31 | #endif | |
32 | ||
33 | #ifdef SHARED | |
88f4b692 | 34 | # include <pointer_guard.h> |
9fc813e1 FW |
35 | # include <unwind-resume.h> |
36 | ||
37 | # if UNWIND_LINK_FRAME_STATE_FOR | |
38 | struct frame_state; | |
39 | # endif | |
40 | ||
41 | struct unwind_link | |
42 | { | |
43 | __typeof (_Unwind_Backtrace) *ptr__Unwind_Backtrace; | |
44 | __typeof (_Unwind_ForcedUnwind) *ptr__Unwind_ForcedUnwind; | |
45 | __typeof (_Unwind_GetCFA) *ptr__Unwind_GetCFA; | |
46 | # if UNWIND_LINK_GETIP | |
47 | __typeof (_Unwind_GetIP) *ptr__Unwind_GetIP; | |
48 | # endif | |
49 | __typeof (_Unwind_Resume) *ptr__Unwind_Resume; | |
50 | #if UNWIND_LINK_FRAME_STATE_FOR | |
51 | struct frame_state *(*ptr___frame_state_for) (void *, struct frame_state *); | |
52 | #endif | |
53 | _Unwind_Reason_Code (*ptr_personality) PERSONALITY_PROTO; | |
54 | UNWIND_LINK_EXTRA_FIELDS | |
55 | }; | |
56 | ||
57 | /* Return a pointer to the implementation, or NULL on failure. */ | |
58 | struct unwind_link *__libc_unwind_link_get (void); | |
59 | libc_hidden_proto (__libc_unwind_link_get) | |
60 | ||
61 | /* UNWIND_LINK_PTR returns the stored function pointer NAME from the | |
62 | cached unwind link OBJ (which was previously returned by | |
63 | __libc_unwind_link_get). */ | |
58548b9d | 64 | # define UNWIND_LINK_PTR(obj, name, ...) \ |
9fc813e1 FW |
65 | ({ \ |
66 | __typeof ((obj)->ptr_##name) __unwind_fptr = (obj)->ptr_##name; \ | |
67 | PTR_DEMANGLE (__unwind_fptr); \ | |
68 | __unwind_fptr; \ | |
69 | }) | |
9fc813e1 FW |
70 | |
71 | /* Called from fork, in the new subprocess. */ | |
72 | void __libc_unwind_link_after_fork (void); | |
73 | ||
74 | /* Called from __libc_freeres. */ | |
75 | void __libc_unwind_link_freeres (void) attribute_hidden; | |
76 | ||
77 | #else /* !SHARED */ | |
78 | ||
79 | /* Dummy implementation so that the code can be shared with the SHARED | |
80 | version. */ | |
81 | struct unwind_link; | |
82 | static inline struct unwind_link * | |
83 | __libc_unwind_link_get (void) | |
84 | { | |
85 | /* Return something that is not a null pointer, so that error checks | |
86 | succeed. */ | |
87 | return (struct unwind_link *) 1; | |
88 | } | |
89 | ||
90 | /* Directly call the static implementation. */ | |
91 | # define UNWIND_LINK_PTR(obj, name, ...) \ | |
92 | ((void) (obj), &name) | |
93 | ||
94 | static inline void | |
95 | __libc_unwind_link_after_fork (void) | |
96 | { | |
97 | /* No need to clean up if the unwinder is statically linked. */ | |
98 | } | |
99 | ||
100 | #endif /* !SHARED */ | |
101 | ||
102 | #endif /* _UNWIND_LINK_H */ |