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c9036340 FW |
1 | /* Cache the location of a link map hash table. |
2 | Copyright (C) 1995-2022 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 <assert.h> | |
20 | #include <link.h> | |
21 | #include <ldsodefs.h> | |
22 | ||
23 | void | |
24 | _dl_setup_hash (struct link_map *map) | |
25 | { | |
26 | Elf_Symndx *hash; | |
27 | ||
28 | if (__glibc_likely (map->l_info[ELF_MACHINE_GNU_HASH_ADDRIDX] != NULL)) | |
29 | { | |
30 | Elf32_Word *hash32 | |
31 | = (void *) D_PTR (map, l_info[ELF_MACHINE_GNU_HASH_ADDRIDX]); | |
32 | map->l_nbuckets = *hash32++; | |
33 | Elf32_Word symbias = *hash32++; | |
34 | Elf32_Word bitmask_nwords = *hash32++; | |
35 | /* Must be a power of two. */ | |
36 | assert ((bitmask_nwords & (bitmask_nwords - 1)) == 0); | |
37 | map->l_gnu_bitmask_idxbits = bitmask_nwords - 1; | |
38 | map->l_gnu_shift = *hash32++; | |
39 | ||
40 | map->l_gnu_bitmask = (ElfW(Addr) *) hash32; | |
41 | hash32 += __ELF_NATIVE_CLASS / 32 * bitmask_nwords; | |
42 | ||
43 | map->l_gnu_buckets = hash32; | |
44 | hash32 += map->l_nbuckets; | |
45 | map->l_gnu_chain_zero = hash32 - symbias; | |
46 | ||
47 | /* Initialize MIPS xhash translation table. */ | |
48 | ELF_MACHINE_XHASH_SETUP (hash32, symbias, map); | |
49 | ||
50 | return; | |
51 | } | |
52 | ||
53 | if (!map->l_info[DT_HASH]) | |
54 | return; | |
55 | hash = (void *) D_PTR (map, l_info[DT_HASH]); | |
56 | ||
57 | map->l_nbuckets = *hash++; | |
58 | /* Skip nchain. */ | |
59 | hash++; | |
60 | map->l_buckets = hash; | |
61 | hash += map->l_nbuckets; | |
62 | map->l_chain = hash; | |
63 | } |