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102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/* Locate the shared object symbol nearest a given address.
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Copyright (C) 1996-2000, 2001 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <dlfcn.h>
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#include <stddef.h>
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#include <ldsodefs.h>
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int
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internal_function
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_dl_addr (const void *address, Dl_info *info)
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{
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const ElfW(Addr) addr = DL_LOOKUP_ADDRESS (address);
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struct link_map *l, *match;
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const ElfW(Sym) *symtab, *matchsym;
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const char *strtab;
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ElfW(Word) strtabsize;
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/* Find the highest-addressed object that ADDRESS is not below. */
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match = NULL;
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for (l = _dl_loaded; l; l = l->l_next)
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if (addr >= l->l_map_start && addr < l->l_map_end)
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{
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/* We know ADDRESS lies within L if in any shared object.
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Make sure it isn't past the end of L's segments. */
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size_t n = l->l_phnum;
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if (n > 0)
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{
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do
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--n;
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while (l->l_phdr[n].p_type != PT_LOAD);
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if (addr >= (l->l_addr +
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l->l_phdr[n].p_vaddr + l->l_phdr[n].p_memsz))
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/* Off the end of the highest-addressed shared object. */
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continue;
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}
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match = l;
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break;
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}
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if (match == NULL)
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return 0;
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/* Now we know what object the address lies in. */
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info->dli_fname = match->l_name;
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info->dli_fbase = (void *) match->l_addr;
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/* If this is the main program the information is incomplete. */
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if (__builtin_expect (info->dli_fbase == NULL, 0))
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{
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info->dli_fname = _dl_argv[0];
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info->dli_fbase = (void *) match->l_map_start;
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}
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symtab = (const void *) D_PTR (match, l_info[DT_SYMTAB]);
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strtab = (const void *) D_PTR (match, l_info[DT_STRTAB]);
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strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
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/* We assume that the string table follows the symbol table, because
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there is no way in ELF to know the size of the dynamic symbol table!! */
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for (matchsym = NULL; (void *) symtab < (void *) strtab; ++symtab)
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if (addr >= match->l_addr + symtab->st_value
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&& ((symtab->st_size == 0 && addr == match->l_addr + symtab->st_value)
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|| addr < match->l_addr + symtab->st_value + symtab->st_size)
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&& symtab->st_name < strtabsize
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&& (matchsym == NULL || matchsym->st_value < symtab->st_value)
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&& (ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL
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|| ELFW(ST_BIND) (symtab->st_info) == STB_WEAK))
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matchsym = symtab;
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if (matchsym)
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{
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/* We found a symbol close by. Fill in its name and exact address. */
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info->dli_sname = strtab + matchsym->st_name;
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info->dli_saddr = (void *) (match->l_addr + matchsym->st_value);
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}
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else
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{
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/* No symbol matches. We return only the containing object. */
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info->dli_sname = NULL;
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info->dli_saddr = NULL;
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}
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return 1;
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}
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