1 | /* Support for reading /etc/ld.so.cache files written by Linux ldconfig. |
2 | Copyright (C) 1999-2020 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 <stdint.h> |
20 | |
21 | #ifndef _DL_CACHE_DEFAULT_ID |
22 | # define _DL_CACHE_DEFAULT_ID 3 |
23 | #endif |
24 | |
25 | #ifndef _dl_cache_check_flags |
26 | # define _dl_cache_check_flags(flags) \ |
27 | ((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID) |
28 | #endif |
29 | |
30 | #ifndef LD_SO_CACHE |
31 | # define LD_SO_CACHE SYSCONFDIR "/ld.so.cache" |
32 | #endif |
33 | |
34 | #ifndef add_system_dir |
35 | # define add_system_dir(dir) add_dir (dir) |
36 | #endif |
37 | |
38 | #define CACHEMAGIC "ld.so-1.7.0" |
39 | |
40 | /* libc5 and glibc 2.0/2.1 use the same format. For glibc 2.2 another |
41 | format has been added in a compatible way: |
42 | The beginning of the string table is used for the new table: |
43 | old_magic |
44 | nlibs |
45 | libs[0] |
46 | ... |
47 | libs[nlibs-1] |
48 | pad, new magic needs to be aligned |
49 | - this is string[0] for the old format |
50 | new magic - this is string[0] for the new format |
51 | newnlibs |
52 | ... |
53 | newlibs[0] |
54 | ... |
55 | newlibs[newnlibs-1] |
56 | string 1 |
57 | string 2 |
58 | ... |
59 | */ |
60 | struct file_entry |
61 | { |
62 | int flags; /* This is 1 for an ELF library. */ |
63 | unsigned int key, value; /* String table indices. */ |
64 | }; |
65 | |
66 | struct cache_file |
67 | { |
68 | char magic[sizeof CACHEMAGIC - 1]; |
69 | unsigned int nlibs; |
70 | struct file_entry libs[0]; |
71 | }; |
72 | |
73 | #define CACHEMAGIC_NEW "glibc-ld.so.cache" |
74 | #define CACHE_VERSION "1.1" |
75 | #define CACHEMAGIC_VERSION_NEW CACHEMAGIC_NEW CACHE_VERSION |
76 | |
77 | |
78 | struct file_entry_new |
79 | { |
80 | int32_t flags; /* This is 1 for an ELF library. */ |
81 | uint32_t key, value; /* String table indices. */ |
82 | uint32_t osversion; /* Required OS version. */ |
83 | uint64_t hwcap; /* Hwcap entry. */ |
84 | }; |
85 | |
86 | struct cache_file_new |
87 | { |
88 | char magic[sizeof CACHEMAGIC_NEW - 1]; |
89 | char version[sizeof CACHE_VERSION - 1]; |
90 | uint32_t nlibs; /* Number of entries. */ |
91 | uint32_t len_strings; /* Size of string table. */ |
92 | uint32_t unused[5]; /* Leave space for future extensions |
93 | and align to 8 byte boundary. */ |
94 | struct file_entry_new libs[0]; /* Entries describing libraries. */ |
95 | /* After this the string table of size len_strings is found. */ |
96 | }; |
97 | |
98 | /* Used to align cache_file_new. */ |
99 | #define ALIGN_CACHE(addr) \ |
100 | (((addr) + __alignof__ (struct cache_file_new) -1) \ |
101 | & (~(__alignof__ (struct cache_file_new) - 1))) |
102 | |
103 | extern int _dl_cache_libcmp (const char *p1, const char *p2) attribute_hidden; |
104 | |