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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* Cache the location of a link map hash table.
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Copyright (C) 1995-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <link.h>
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#include <ldsodefs.h>
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void
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_dl_setup_hash (struct link_map *map)
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{
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Elf_Symndx *hash;
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if (__glibc_likely (map->l_info[ELF_MACHINE_GNU_HASH_ADDRIDX] != NULL))
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{
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Elf32_Word *hash32
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= (void *) D_PTR (map, l_info[ELF_MACHINE_GNU_HASH_ADDRIDX]);
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map->l_nbuckets = *hash32++;
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Elf32_Word symbias = *hash32++;
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Elf32_Word bitmask_nwords = *hash32++;
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/* Must be a power of two. */
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assert ((bitmask_nwords & (bitmask_nwords - 1)) == 0);
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map->l_gnu_bitmask_idxbits = bitmask_nwords - 1;
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map->l_gnu_shift = *hash32++;
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map->l_gnu_bitmask = (ElfW(Addr) *) hash32;
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hash32 += __ELF_NATIVE_CLASS / 32 * bitmask_nwords;
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map->l_gnu_buckets = hash32;
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hash32 += map->l_nbuckets;
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map->l_gnu_chain_zero = hash32 - symbias;
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/* Initialize MIPS xhash translation table. */
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ELF_MACHINE_XHASH_SETUP (hash32, symbias, map);
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return;
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}
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if (!map->l_info[DT_HASH])
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return;
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hash = (void *) D_PTR (map, l_info[DT_HASH]);
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map->l_nbuckets = *hash++;
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/* Skip nchain. */
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hash++;
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map->l_buckets = hash;
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hash += map->l_nbuckets;
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map->l_chain = hash;
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}
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