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1998-09-01 15:36 Ulrich Drepper <drepper@cygnus.com> * malloc/Makefile: Include Makeconfig before testing config-sysdirs. * malloc/mtrace.c: Add bug report address. Update email address. Add more @XXX@ to print correct address size. * elf/dl-addr.c (_dl_addr): Make sure that map to be examined is really initialized. * elf/dl-close.c (_dl_close): Use l_map_start and l_map_end info for munmap call instead of examining phdr again. Free all malloc()ed strings and arrays.
93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/* Locate the shared object symbol nearest a given address.
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Copyright (C) 1996, 1997, 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <dlfcn.h>
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#include <stddef.h>
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#include <elf/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 = (ElfW(Addr)) 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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/* 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 (l->l_addr != 0 /* Make sure we do not currently set this map up
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in this moment. */
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&& addr >= l->l_addr && (!match || match->l_addr < l->l_addr))
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match = l;
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if (match)
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{
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/* We know ADDRESS lies within MATCH if in any shared object.
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Make sure it isn't past the end of MATCH's segments. */
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size_t n = match->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 (match->l_phdr[n].p_type != PT_LOAD);
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if (addr >= (match->l_addr +
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match->l_phdr[n].p_vaddr + match->l_phdr[n].p_memsz))
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/* Off the end of the highest-addressed shared object. */
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return 0;
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}
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}
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else
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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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symtab = ((void *) match->l_addr + match->l_info[DT_SYMTAB]->d_un.d_ptr);
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strtab = ((void *) match->l_addr + match->l_info[DT_STRTAB]->d_un.d_ptr);
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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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&& (!matchsym
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|| (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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