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* elf/dl-lookup.c (do_lookup): If looking up an unversioned symbol
	but the object file only contains versioned definitions than
	accept the definition if there is exactly one even if the version
	number is not the default version.  This helps dlsym() to find
	newly introduced symbols.
This commit is contained in:
Ulrich Drepper 1998-12-23 15:38:56 +00:00
parent f1f0edfe2c
commit 65c64a0b4a
2 changed files with 34 additions and 9 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
1998-12-23 Ulrich Drepper <drepper@cygnus.com> 1998-12-23 Ulrich Drepper <drepper@cygnus.com>
* elf/dl-lookup.c (do_lookup): If looking up an unversioned symbol
but the object file only contains versioned definitions than
accept the definition if there is exactly one even if the version
number is not the default version. This helps dlsym() to find
newly introduced symbols.
* locale/programs/ld-collate.c: Unify messages and correct typos. * locale/programs/ld-collate.c: Unify messages and correct typos.
* locale/programs/ld-monetary.c: Likewise. * locale/programs/ld-monetary.c: Likewise.
* locale/programs/ld-numeric.c: Likewise. * locale/programs/ld-numeric.c: Likewise.

35
elf/dl-lookup.c
View File

@ -77,6 +77,9 @@ do_lookup (const char *undef_name, unsigned long int hash,
const char *strtab; const char *strtab;
const ElfW(Half) *verstab; const ElfW(Half) *verstab;
ElfW(Symndx) symidx; ElfW(Symndx) symidx;
int num_versions = 0;
const ElfW(Sym) *sym;
const ElfW(Sym) *versioned_sym;
map = list[i]; map = list[i];
@ -114,7 +117,7 @@ do_lookup (const char *undef_name, unsigned long int hash,
symidx != STN_UNDEF; symidx != STN_UNDEF;
symidx = map->l_chain[symidx]) symidx = map->l_chain[symidx])
{ {
const ElfW(Sym) *sym = &symtab[symidx]; sym = &symtab[symidx];
if (sym->st_value == 0 || /* No value. */ if (sym->st_value == 0 || /* No value. */
(elf_machine_lookup_noplt_p (reloc_type) /* Reject PLT entry. */ (elf_machine_lookup_noplt_p (reloc_type) /* Reject PLT entry. */
@ -134,15 +137,22 @@ do_lookup (const char *undef_name, unsigned long int hash,
{ {
/* No specific version is selected. When the object /* No specific version is selected. When the object
file also does not define a version we have a match. file also does not define a version we have a match.
Otherwise we only accept the default version, i.e., Otherwise we accept the default version, or in case
the version which name is "". */ there is only one version defined, this one version. */
if (verstab != NULL) if (verstab != NULL)
{ {
ElfW(Half) ndx = verstab[symidx] & 0x7fff; ElfW(Half) ndx = verstab[symidx] & 0x7fff;
if (ndx > 2) /* map->l_versions[ndx].hash != 0) */ if (ndx > 2) /* map->l_versions[ndx].hash != 0) */
{
/* Don't accept hidden symbols. */
if ((verstab[symidx] & 0x8000) == 0
&& num_versions++ == 0)
/* No version so far. */
versioned_sym = sym;
continue; continue;
} }
} }
}
else else
{ {
if (verstab == NULL) if (verstab == NULL)
@ -170,6 +180,19 @@ do_lookup (const char *undef_name, unsigned long int hash,
} }
} }
/* There cannot be another entry for this symbol so stop here. */
goto found_it;
}
/* If we have seem exactly one versioned symbol while we are
looking for an unversioned symbol and the version is not the
default version we still accept this symbol since there are
no possible ambiguities. */
sym = num_versions == 1 ? versioned_sym : NULL;
if (sym != NULL)
{
found_it:
switch (ELFW(ST_BIND) (sym->st_info)) switch (ELFW(ST_BIND) (sym->st_info))
{ {
case STB_GLOBAL: case STB_GLOBAL:
@ -178,8 +201,7 @@ do_lookup (const char *undef_name, unsigned long int hash,
result->m = map; result->m = map;
return 1; return 1;
case STB_WEAK: case STB_WEAK:
/* Weak definition. Use this value if we don't find /* Weak definition. Use this value if we don't find another. */
another. */
if (! result->s) if (! result->s)
{ {
result->s = sym; result->s = sym;
@ -190,9 +212,6 @@ do_lookup (const char *undef_name, unsigned long int hash,
/* Local symbols are ignored. */ /* Local symbols are ignored. */
break; break;
} }
/* There cannot be another entry for this symbol so stop here. */
break;
} }
/* If this current map is the one mentioned in the verneed entry /* If this current map is the one mentioned in the verneed entry