714a562f0b
<1997-06-12 21:22 Ulrich Drepper <drepper@cygnus.com> * Makefile (libc-map): Define before including Makerules. * Makerules (lib%.so): Depend on $(lib%-map). (build-shlib): Adapt rule for above change. (libc.so): Depend on $(libc-map). * db/Makefile (libcdb-map): New definition. * elf/Makefile (libdl-map): New definition. * elf/dl-lookup.c: Don't use relative include path. (undefined_msg): New variable. Use single string in all functions. (do_lookup): Correctly recognize default version. Return -2 if no version information is available. Stop processing hash entries when string was found. Don't bark about missing versioned symbol in file with original reference if it is a weak symbol. (_dl_lookup_symbol): Use undefined_msg. (_dl_lookup_versioned_symbol): Likewise. Give extra information if no verdef info is available. * elf/dl-version.c (file_needed): Remove first argument. We must seek in the whole search list. (match_symbol): Correct check for available verdef info. (_dl_check_map_versions): Correct call of find_needed. * locale/Makefile (libBrokenLocale-map): New definition. * login/Makefile (libutil-map): New definition. * math/Makefile (libm-map): New definition. * md5-crypt/Makefile (libcrypt-map): New definition. * nis/Makefile (libnsl-map, libnss_compat-map, libnss_nis-map, libnss_nisplus-map): New definition. * nss/Makefile (libnss_files-map, libnss_db-map): New definitions. * resolv/Makefile (libresolv-map, libnss_dns-map): New definitions. * libc.map: New file. * db/libdb.map: New file. * elf/libdl.map: New file. * locale/libBrokenLocale.map: New file. * login/libutil.map: New file. * math/libm.map: New file. * md5-crypt/libcrypt.map: New file. * nis/libnss_compat.map: New file. * nis/libnsl.map: New file. * nis/libnss_nis.map: New file. * nis/libnss_nisplus.map: New file. * nss/libnss_files.map: New file. * nss/libnss_db.map: New file. * resolv/libnss_dns.map: New file. * resolv/libresolv.map: New file. * sysdeps/i386/dl-machine.h (elf_machine_rel): Don't do anything for R_386_NONE entries. * Makefile (manual/dir-add.info): New rule. * Makerules: Add vpath definition for .x files. * Makerules (distinfo): Make sure target directory exists. * argp/argp-help.c (argp_args_usage): Don't modify `fdoc' value since it is used to distinguish filtered strings from unmodifed strings. * elf/dl-lookup.c (do_lookup): Optimize STT_* recognition. * elf/dl-reloc.c: Fix typo. * inet/arpa/tftp.h (struct tftphdr): Change type of tu_block to `unsigned short'. * manual/Makefile (dir-add.texi): Also emit wrapper text for info/install-info. (distribute): Add dir-add.texi and dir-add.info. (mostlyclean): Add dir-add.info. (realclean): Add dir-add.texi. (install): Add entries in `dir' file using install-info. * manual/libc.texinfo: Add @dircategory and @direntry text. Reported by Miles Bader <miles@gnu.ai.mit.edu>. * manual/pattern.texi: Correct description of GLOB_MAGCHAR and GLOB_NOMAGIC. Changes by Roland McGrath <roland@gnu.ai.mit.edu>. * nis/nis_addmember.c: Little optimizations. * nis/nis_call.c: Likewise. * nis/nis_creategroup.c: Likewise. * nis/nis_defaults.c: Likewise. * nis/nis_destroygroup.c: Likewise. * nis/nis_ismember.c: Likewise. * nis/nis_local_names.c: Likewise. * nis/nis_print_group_entry.c: Likewise. * nis/nis_verifygroup.c: Likewise. * posix/unistd.h: Fix comment for getcwd. * stdlib/Makefile (headers): Remove inttypes.h. It's a system dependent header. * sysdeps/wordsize-32/Dist: New file. * sysdeps/wordsize-32/Makefile: New file. * sysdeps/wordsize-64/Dist: New file. * sysdeps/wordsize-64/Makefile: New file. * sunrpc/Makefile: Adopt comment for real situation. * sysdeps/i386/add_n.S: Add ASM_TYPE_DIRECTIVE and AS_SIZE_DIRECTIVE. * sysdeps/i386/addmul_1.s: Likewise. * sysdeps/i386/lshist.s: Likewise. * sysdeps/i386/rshift.s: Likewise. * sysdeps/i386/sub_n.s: Likewise. * sysdeps/i386/submul_1.s: Likewise. * sysdeps/unix/sysv/linux/i386/sysdep.h (SYSCALL_ERROR_HANDLER): Add .type and .size. 1997-06-12 13:32 Philip Blundell <Philip.Blundell@pobox.com> * libc/sysdeps/unix/arm/brk.S: New file. * libc/sysdeps/unix/arm/sysdep.S: Likewise. * libc/sysdeps/unix/sysv/linux/arm/sysdep.S: Likewise. 1997-06-11 11:51 Thorsten Kukuk <kukuk@vt.uni-paderborn.de> * nis/nss_nisplus/nisplus-spwd.c (_nss_nisplus_parse_spent): Check if we have shadow information. 1997-06-08 19:33 Thorsten Kukuk <kukuk@vt.uni-paderborn.de> * nis/nis_getservlist.c (nis_getservlist): Use calloc instead of malloc, alloc memory for nis_server struct. * nis/nis_getservlist.c (nis_freeservlist): Give the memory for the nis_server struct free, too. * nis/nis_removemember (nis_removemember): Fix for loop. 1997-06-12 12:45 Ulrich Drepper <drepper@cygnus.com> * sysdeps/i386/fpu/__math.h (__M_SQRT2): Define here since we cannot rely on M_SQRT2 being defined. (log1p): Use __M_SQRT2 not M_SQRT2. * math/math.h (_Mldbl): Define even if M_* constants are not defined. Reported by corsepiu@faw.uni-ulm.de. 1997-06-12 03:08 Philip Blundell <Philip.Blundell@pobox.com> * nss/getXXbyYY_r.c (do_weak_alias): Remove extra parentheses. 1997-06-11 13:22 Ulrich Drepper <drepper@cygnus.com> * misc/regexp.h (compile): Allow use of macro INIT for variable declaration. Add documentation for INIT. Reported by Robert Bihlmeyer <robbe@orcus.priv.at>. 1997-06-11 10:47 Philip Blundell <Philip.Blundell@pobox.com> * sysdeps/unix/sysv/linux/net/if_arp.h: Add two new hardware types. 1997-06-10 11:31 H.J. Lu <hjl@gnu.ai.mit.edu> * sysdeps/powerpc/strlen.s: Use -0x101 instead of 0xfffffeff for a signed 16-bit value. 1997-06-07 07:54 H.J. Lu <hjl@gnu.ai.mit.edu> * sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c (_dl_sysdep_read_whole_file): Deleted. * sysdeps/powerpc/fenvbits.h (__FE_ALL_INVALID): Changed to FE_ALL_INVALID. * sysdeps/powerpc/fraiseexcpt.c (__FE_INVALID_SOFTWARE): Changed to FE_INVALID_SOFTWARE. (__FPSCR_STICKY_BITS): Changed to FPSCR_STICKY_BITS. * sysdeps/libm-ieee754/s_fmin.c: Fix a typo. 1997-06-07 18:48 H.J. Lu <hjl@gnu.ai.mit.edu> * shlib-versions (.*-.*-linux.*): Set libc to 6. 1997-06-08 15:35 Thorsten Kukuk <kukuk@vt.uni-paderborn.de> * nis/nis_add.c (nis_add): Use nis_leaf_of_r instead of nis_name_of_r. * nis/nis_addmember.c (nis_addmember): Fix a lot of pointer errors. * nis/nis_clone.c: Likewise. * nis/nis_removemember.c (nis_removemember): Likewise. * nis/nis_table.c: Likewise. * nis/nss_nis/nis-hosts.c: Use addr, not p for inet_pton call. * nis/nss_nisplus/nisplus-hosts.c: Likewise. * nis/nss_nis/nis-netgrp.c (_nss_nis_setnetgrent): Check for group == NULL. 1997-06-08 21:21 Mark Kettenis <kettenis@phys.uva.nl> * login/login.c, login/utmp_daemon.c, login/utmp_file.c, login/getutent_r.c, login/utmpname.c: Cleanup `#if _LIBC' and `#ifndef _LIBC' fragments. * login/programs/utmpd.c: Define DEFAULT_USER. (drop_priviliges): Use it. (main): Set locale and text domain. * login/programs/utmpd-private.h: Declare proc_utmp_eq. * login/programs/database.c (proc_utmp_eq): Removed. * login/programs/request.c (proc_utmp_eq): Made global. Only use ut_id field if valid. * login/utmp_file.c (proc_utmp_eq): Restore patch made by Miles Bader that was lost when adding the daemon backend; Only use ut_id field if valid. 1997-06-05 23:10 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/unix/sysv/linux/Dist: Remove netatalk/atalk.h and netinet/icmp.h, add netatalk/at.h. * sysdeps/unix/sysv/linux/powerpc/Dist: Remove termios.h. * sysdeps/unix/sysv/linux/sparc/Dist: Remove start.c. 1997-06-04 19:22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * stdlib/testsort.c (compare): Fix parameter types. 1997-06-04 19:05 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * md5-crypt/Makefile (distribute): Fix name of file. 1997-06-04 19:02 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * login/Makefile (utmpd-routines): Remove utmpd again, which is already added implicitly through $(others). 1997-06-05 13:43 Fila Kolodny <fila@filapc.ibi.com> * sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add netipx/ipx.h. 1997-06-05 13:25 Andreas Jaeger <aj@arthur.rhein-neckar.de> * md5-crypt/md5-crypt.c: Add prototype for __md5_crypt. 1997-06-05 17:08 Ulrich Drepper <drepper@cygnus.com> * string/argz-addsep.c: Correct weak alias. Reported by Ben Pfaff <pfaffben@pilot.msu.edu>. * locale/setlocale.c (setlocale): Free variable with locale path before returning. (setname): Don't test for _nl_current[category] being NULL before freeing. Reported by Ben Pfaff <pfaffben@pilot.msu.edu>. 1997-06-04 12:41 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/intro.texi (XPG): Correct some typos. * manual/libc.texinfo (Program Arguments): Menu updated. * nis/nis_local_names.c (nis_local_host): Fix pointer errors.
368 lines
12 KiB
C
368 lines
12 KiB
C
/* Look up a symbol in the loaded objects.
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Copyright (C) 1995, 1996, 1997 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 <alloca.h>
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#include <stddef.h>
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#include <link.h>
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#include <assert.h>
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#include <string.h>
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#include "dl-hash.h"
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#include <dl-machine.h>
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#include <stdio-common/_itoa.h>
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#define VERSTAG(tag) (DT_NUM + DT_PROCNUM + DT_VERSIONTAGIDX (tag))
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/* We need this string more than once. */
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static const char undefined_msg[] = "undefined symbol: ";
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struct sym_val
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{
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ElfW(Addr) a;
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const ElfW(Sym) *s;
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};
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#define make_string(string, rest...) \
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({ \
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const char *all[] = { string, ## rest }; \
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size_t len, cnt; \
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char *result, *cp; \
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\
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len = 1; \
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for (cnt = 0; cnt < sizeof (all) / sizeof (all[0]); ++cnt) \
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len += strlen (all[cnt]); \
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\
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cp = result = alloca (len); \
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for (cnt = 0; cnt < sizeof (all) / sizeof (all[0]); ++cnt) \
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cp = stpcpy (cp, all[cnt]); \
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\
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result; \
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})
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/* Inner part of the lookup functions. We return a value > 0 if we
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found the symbol, the value 0 if nothing is found and < 0 if
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something bad happened. */
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static inline int
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do_lookup (const char *undef_name, unsigned long int hash,
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const ElfW(Sym) *ref, struct sym_val *result,
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struct link_map *list[], size_t i, size_t n,
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const char *reference_name, const struct r_found_version *version,
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struct link_map *skip, int reloc_type)
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{
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struct link_map *map;
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for (; i < n; ++i)
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{
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const ElfW(Sym) *symtab;
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const char *strtab;
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const ElfW(Half) *verstab;
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ElfW(Symndx) symidx;
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map = list[i];
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/* Here come the extra test needed for `_dl_lookup_symbol_skip'. */
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if (skip != NULL && map == skip)
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continue;
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/* Don't search the executable when resolving a copy reloc. */
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if (elf_machine_lookup_noexec_p (reloc_type) &&
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map->l_type == lt_executable)
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continue;
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symtab = ((void *) map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr);
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strtab = ((void *) map->l_addr + map->l_info[DT_STRTAB]->d_un.d_ptr);
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if (map->l_nversions > 0 && map->l_info[VERSTAG (DT_VERSYM)] != NULL)
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verstab = ((void *) map->l_addr
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+ map->l_info[VERSTAG (DT_VERSYM)]->d_un.d_ptr);
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else
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verstab = NULL;
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/* Search the appropriate hash bucket in this object's symbol table
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for a definition for the same symbol name. */
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for (symidx = map->l_buckets[hash % map->l_nbuckets];
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symidx != STN_UNDEF;
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symidx = map->l_chain[symidx])
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{
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const ElfW(Sym) *sym = &symtab[symidx];
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if (sym->st_value == 0 || /* No value. */
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(elf_machine_lookup_noplt_p (reloc_type) /* Reject PLT entry. */
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&& sym->st_shndx == SHN_UNDEF))
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continue;
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if (ELFW(ST_TYPE) (sym->st_info) > STT_FUNC)
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/* Ignore all but STT_NOTYPE, STT_OBJECT and STT_FUNC entries
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since these are no code/data definitions. */
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continue;
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if (sym != ref && strcmp (strtab + sym->st_name, undef_name))
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/* Not the symbol we are looking for. */
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continue;
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if (version == NULL)
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{
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/* No specific version is selected. When the object
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file also does not define a version we have a match.
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Otherwise we only accept the default version, i.e.,
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the version which name is "". */
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if (verstab != NULL)
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{
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ElfW(Half) ndx = verstab[symidx] & 0x7fff;
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if (ndx > 2) /* map->l_versions[ndx].hash != 0) */
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continue;
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}
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}
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else
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{
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if (verstab == NULL)
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{
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/* We need a versioned system but haven't found any.
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If this is the object which is referenced in the
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verneed entry it is a bug in the library since a
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symbol must not simply disappear. */
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if (version->filename != NULL
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&& _dl_name_match_p (version->filename, map))
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return -2;
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/* Otherwise we accept the symbol. */
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}
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else
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{
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/* We can match the version information. */
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ElfW(Half) ndx = verstab[symidx] & 0x7fff;
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if (map->l_versions[ndx].hash != version->hash
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|| strcmp (map->l_versions[ndx].name, version->name))
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/* It's not the version we want. */
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continue;
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}
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}
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switch (ELFW(ST_BIND) (sym->st_info))
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{
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case STB_GLOBAL:
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/* Global definition. Just what we need. */
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result->s = sym;
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result->a = map->l_addr;
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return 1;
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case STB_WEAK:
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/* Weak definition. Use this value if we don't find
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another. */
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if (! result->s)
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{
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result->s = sym;
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result->a = map->l_addr;
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}
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break;
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default:
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/* Local symbols are ignored. */
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break;
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}
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/* There cannot be another entry for this symbol so stop here. */
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break;
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}
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/* If this current map is the one mentioned in the verneed entry
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and we have not found a weak entry, it is a bug. */
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if (symidx == STN_UNDEF && version != NULL && version->filename != NULL
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&& _dl_name_match_p (version->filename, map))
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return -1;
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}
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/* We have not found anything until now. */
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return 0;
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}
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/* Search loaded objects' symbol tables for a definition of the symbol
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UNDEF_NAME. */
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ElfW(Addr)
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_dl_lookup_symbol (const char *undef_name, const ElfW(Sym) **ref,
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struct link_map *symbol_scope[],
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const char *reference_name,
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int reloc_type)
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{
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const unsigned long int hash = _dl_elf_hash (undef_name);
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struct sym_val current_value = { 0, NULL };
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struct link_map **scope;
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/* Search the relevant loaded objects for a definition. */
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for (scope = symbol_scope; *scope; ++scope)
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if (do_lookup (undef_name, hash, *ref, ¤t_value,
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(*scope)->l_searchlist, 0, (*scope)->l_nsearchlist,
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reference_name, NULL, NULL, reloc_type))
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break;
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if (current_value.s == NULL &&
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(*ref == NULL || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK))
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/* We could find no value for a strong reference. */
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_dl_signal_error (0, reference_name,
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make_string (undefined_msg, undef_name));
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*ref = current_value.s;
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return current_value.a;
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}
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/* This function is nearly the same as `_dl_lookup_symbol' but it
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skips in the first list all objects until SKIP_MAP is found. I.e.,
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it only considers objects which were loaded after the described
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object. If there are more search lists the object described by
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SKIP_MAP is only skipped. */
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ElfW(Addr)
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_dl_lookup_symbol_skip (const char *undef_name, const ElfW(Sym) **ref,
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struct link_map *symbol_scope[],
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const char *reference_name,
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struct link_map *skip_map)
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{
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const unsigned long int hash = _dl_elf_hash (undef_name);
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struct sym_val current_value = { 0, NULL };
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struct link_map **scope;
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size_t i;
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/* Search the relevant loaded objects for a definition. */
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scope = symbol_scope;
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for (i = 0; (*scope)->l_dupsearchlist[i] != skip_map; ++i)
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assert (i < (*scope)->l_ndupsearchlist);
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if (! do_lookup (undef_name, hash, *ref, ¤t_value,
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(*scope)->l_dupsearchlist, i, (*scope)->l_ndupsearchlist,
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reference_name, NULL, skip_map, 0))
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while (*++scope)
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if (do_lookup (undef_name, hash, *ref, ¤t_value,
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(*scope)->l_dupsearchlist, 0, (*scope)->l_ndupsearchlist,
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reference_name, NULL, skip_map, 0))
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break;
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*ref = current_value.s;
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return current_value.a;
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}
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/* This function works like _dl_lookup_symbol but it takes an
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additional arguement with the version number of the requested
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symbol.
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XXX We'll see whether we need this separate function. */
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ElfW(Addr)
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_dl_lookup_versioned_symbol (const char *undef_name, const ElfW(Sym) **ref,
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struct link_map *symbol_scope[],
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const char *reference_name,
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const struct r_found_version *version,
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int reloc_type)
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{
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const unsigned long int hash = _dl_elf_hash (undef_name);
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struct sym_val current_value = { 0, NULL };
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struct link_map **scope;
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/* Search the relevant loaded objects for a definition. */
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for (scope = symbol_scope; *scope; ++scope)
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{
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int res = do_lookup (undef_name, hash, *ref, ¤t_value,
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(*scope)->l_searchlist, 0, (*scope)->l_nsearchlist,
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reference_name, version, NULL, reloc_type);
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if (res > 0)
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break;
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if (res < 0)
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/* Oh, oh. The file named in the relocation entry does not
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contain the needed symbol. */
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_dl_signal_error (0, *reference_name ? reference_name : NULL,
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make_string ("symbol ", undef_name, ", version ",
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version->name,
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" not defined in file ",
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version->filename,
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" with link time reference",
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res == -2
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? " (no version symbols)" : ""));
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}
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if (current_value.s == NULL &&
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(*ref == NULL || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK))
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/* We could find no value for a strong reference. */
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_dl_signal_error (0, reference_name,
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make_string (undefined_msg, undef_name,
|
|
", version ", version->name ?: NULL));
|
|
|
|
*ref = current_value.s;
|
|
return current_value.a;
|
|
}
|
|
|
|
|
|
/* Similar to _dl_lookup_symbol_skip but takes an additional argument
|
|
with the version we are looking for. */
|
|
ElfW(Addr)
|
|
_dl_lookup_versioned_symbol_skip (const char *undef_name,
|
|
const ElfW(Sym) **ref,
|
|
struct link_map *symbol_scope[],
|
|
const char *reference_name,
|
|
const struct r_found_version *version,
|
|
struct link_map *skip_map)
|
|
{
|
|
const unsigned long int hash = _dl_elf_hash (undef_name);
|
|
struct sym_val current_value = { 0, NULL };
|
|
struct link_map **scope;
|
|
size_t i;
|
|
|
|
/* Search the relevant loaded objects for a definition. */
|
|
scope = symbol_scope;
|
|
for (i = 0; (*scope)->l_dupsearchlist[i] != skip_map; ++i)
|
|
assert (i < (*scope)->l_ndupsearchlist);
|
|
|
|
if (! do_lookup (undef_name, hash, *ref, ¤t_value,
|
|
(*scope)->l_dupsearchlist, i, (*scope)->l_ndupsearchlist,
|
|
reference_name, version, skip_map, 0))
|
|
while (*++scope)
|
|
if (do_lookup (undef_name, hash, *ref, ¤t_value,
|
|
(*scope)->l_dupsearchlist, 0, (*scope)->l_ndupsearchlist,
|
|
reference_name, version, skip_map, 0))
|
|
break;
|
|
|
|
if (current_value.s == NULL &&
|
|
(*ref == NULL || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK))
|
|
{
|
|
/* We could find no value for a strong reference. */
|
|
const size_t len = strlen (undef_name);
|
|
char buf[sizeof undefined_msg + len];
|
|
memcpy (buf, undefined_msg, sizeof undefined_msg - 1);
|
|
memcpy (&buf[sizeof undefined_msg - 1], undef_name, len + 1);
|
|
_dl_signal_error (0, reference_name, buf);
|
|
}
|
|
|
|
*ref = current_value.s;
|
|
return current_value.a;
|
|
}
|
|
|
|
|
|
/* Cache the location of MAP's hash table. */
|
|
|
|
void
|
|
_dl_setup_hash (struct link_map *map)
|
|
{
|
|
ElfW(Symndx) *hash = (void *)(map->l_addr + map->l_info[DT_HASH]->d_un.d_ptr);
|
|
ElfW(Symndx) nchain;
|
|
map->l_nbuckets = *hash++;
|
|
nchain = *hash++;
|
|
map->l_buckets = hash;
|
|
hash += map->l_nbuckets;
|
|
map->l_chain = hash;
|
|
}
|