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3a0ecccb | 1 | /* Redirection of malloc inside the dynamic linker. |
6d7e8eda | 2 | Copyright (C) 2020-2023 Free Software Foundation, Inc. |
3a0ecccb 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 | /* The dynamic linker needs to use its own minimal malloc before libc | |
20 | has been relocated, and the libc malloc afterwards. The active | |
21 | malloc implementation is reached via the __rtld_* function pointers | |
22 | declared below. They are initialized to the minimal malloc by | |
23 | __rtld_malloc_init_stubs, and set to the final implementation by | |
24 | __rtld_malloc_init_real. */ | |
25 | ||
26 | #ifndef _RTLD_MALLOC_H | |
27 | #define _RTLD_MALLOC_H | |
28 | ||
29 | #if IS_IN (rtld) | |
30 | ||
31 | extern __typeof (calloc) *__rtld_calloc attribute_hidden; | |
32 | extern __typeof (free) *__rtld_free attribute_hidden; | |
33 | extern __typeof (malloc) *__rtld_malloc attribute_hidden; | |
34 | extern __typeof (realloc) *__rtld_realloc attribute_hidden; | |
35 | ||
36 | /* Wrapper functions which call through the function pointers above. | |
37 | Note that it is not supported to take the address of those | |
38 | functions. Instead the function pointers must be used | |
39 | directly. */ | |
40 | ||
41 | __extern_inline void * | |
42 | calloc (size_t a, size_t b) | |
43 | { | |
44 | return __rtld_calloc (a, b); | |
45 | } | |
46 | ||
47 | __extern_inline void | |
48 | free (void *ptr) | |
49 | { | |
50 | __rtld_free (ptr); | |
51 | } | |
52 | ||
53 | __extern_inline void * | |
54 | malloc (size_t size) | |
55 | { | |
56 | return __rtld_malloc (size); | |
57 | } | |
58 | ||
59 | __extern_inline void * | |
60 | realloc (void *ptr, size_t size) | |
61 | { | |
62 | return __rtld_realloc (ptr, size); | |
63 | } | |
64 | ||
65 | /* Called after the first self-relocation to activate the minimal malloc | |
66 | implementation. */ | |
67 | void __rtld_malloc_init_stubs (void) attribute_hidden; | |
68 | ||
72d36ffd FW |
69 | /* Return false if the active malloc is the ld.so minimal malloc, true |
70 | if it is the full implementation from libc.so. */ | |
71 | _Bool __rtld_malloc_is_complete (void) attribute_hidden; | |
72 | ||
3a0ecccb FW |
73 | /* Called shortly before the final self-relocation (when RELRO |
74 | variables are still writable) to activate the real malloc | |
75 | implementation. MAIN_MAP is the link map of the executable. */ | |
76 | struct link_map; | |
77 | void __rtld_malloc_init_real (struct link_map *main_map) attribute_hidden; | |
78 | ||
79 | #else /* !IS_IN (rtld) */ | |
80 | ||
81 | /* This allows static/non-rtld builds to get a pointer to the | |
82 | functions, in the same way that is required inside rtld. */ | |
83 | # define __rtld_calloc (&calloc) | |
84 | # define __rtld_free (&free) | |
85 | # define __rtld_malloc (&malloc) | |
86 | # define __rtld_realloc (&realloc) | |
87 | ||
88 | #endif /* !IS_IN (rtld) */ | |
89 | #endif /* _RTLD_MALLOC_H */ |