e429c89724
each exported symbol and we compute the ELF hash value for it. (compute_bucket_value): New function. It is called from size_dynamic_sections to determine the hash table size. When we are optimizing a better, but slower, algorithm is used. (size_dynamic_sections): Call compute_bucket_value.
6064 lines
180 KiB
C++
6064 lines
180 KiB
C++
/* ELF linker support.
|
||
Copyright 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
|
||
|
||
This file is part of BFD, the Binary File Descriptor library.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
||
/* ELF linker code. */
|
||
|
||
/* This struct is used to pass information to routines called via
|
||
elf_link_hash_traverse which must return failure. */
|
||
|
||
struct elf_info_failed
|
||
{
|
||
boolean failed;
|
||
struct bfd_link_info *info;
|
||
};
|
||
|
||
static boolean elf_link_add_object_symbols
|
||
PARAMS ((bfd *, struct bfd_link_info *));
|
||
static boolean elf_link_add_archive_symbols
|
||
PARAMS ((bfd *, struct bfd_link_info *));
|
||
static boolean elf_merge_symbol
|
||
PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
|
||
asection **, bfd_vma *, struct elf_link_hash_entry **,
|
||
boolean *, boolean *, boolean *));
|
||
static boolean elf_export_symbol
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_fix_symbol_flags
|
||
PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
|
||
static boolean elf_adjust_dynamic_symbol
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_link_find_version_dependencies
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_link_find_version_dependencies
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_link_assign_sym_version
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_link_renumber_dynsyms
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_collect_hash_codes
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
|
||
/* Given an ELF BFD, add symbols to the global hash table as
|
||
appropriate. */
|
||
|
||
boolean
|
||
elf_bfd_link_add_symbols (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
switch (bfd_get_format (abfd))
|
||
{
|
||
case bfd_object:
|
||
return elf_link_add_object_symbols (abfd, info);
|
||
case bfd_archive:
|
||
return elf_link_add_archive_symbols (abfd, info);
|
||
default:
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return false;
|
||
}
|
||
}
|
||
|
||
|
||
/* Add symbols from an ELF archive file to the linker hash table. We
|
||
don't use _bfd_generic_link_add_archive_symbols because of a
|
||
problem which arises on UnixWare. The UnixWare libc.so is an
|
||
archive which includes an entry libc.so.1 which defines a bunch of
|
||
symbols. The libc.so archive also includes a number of other
|
||
object files, which also define symbols, some of which are the same
|
||
as those defined in libc.so.1. Correct linking requires that we
|
||
consider each object file in turn, and include it if it defines any
|
||
symbols we need. _bfd_generic_link_add_archive_symbols does not do
|
||
this; it looks through the list of undefined symbols, and includes
|
||
any object file which defines them. When this algorithm is used on
|
||
UnixWare, it winds up pulling in libc.so.1 early and defining a
|
||
bunch of symbols. This means that some of the other objects in the
|
||
archive are not included in the link, which is incorrect since they
|
||
precede libc.so.1 in the archive.
|
||
|
||
Fortunately, ELF archive handling is simpler than that done by
|
||
_bfd_generic_link_add_archive_symbols, which has to allow for a.out
|
||
oddities. In ELF, if we find a symbol in the archive map, and the
|
||
symbol is currently undefined, we know that we must pull in that
|
||
object file.
|
||
|
||
Unfortunately, we do have to make multiple passes over the symbol
|
||
table until nothing further is resolved. */
|
||
|
||
static boolean
|
||
elf_link_add_archive_symbols (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
symindex c;
|
||
boolean *defined = NULL;
|
||
boolean *included = NULL;
|
||
carsym *symdefs;
|
||
boolean loop;
|
||
|
||
if (! bfd_has_map (abfd))
|
||
{
|
||
/* An empty archive is a special case. */
|
||
if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
|
||
return true;
|
||
bfd_set_error (bfd_error_no_armap);
|
||
return false;
|
||
}
|
||
|
||
/* Keep track of all symbols we know to be already defined, and all
|
||
files we know to be already included. This is to speed up the
|
||
second and subsequent passes. */
|
||
c = bfd_ardata (abfd)->symdef_count;
|
||
if (c == 0)
|
||
return true;
|
||
defined = (boolean *) bfd_malloc (c * sizeof (boolean));
|
||
included = (boolean *) bfd_malloc (c * sizeof (boolean));
|
||
if (defined == (boolean *) NULL || included == (boolean *) NULL)
|
||
goto error_return;
|
||
memset (defined, 0, c * sizeof (boolean));
|
||
memset (included, 0, c * sizeof (boolean));
|
||
|
||
symdefs = bfd_ardata (abfd)->symdefs;
|
||
|
||
do
|
||
{
|
||
file_ptr last;
|
||
symindex i;
|
||
carsym *symdef;
|
||
carsym *symdefend;
|
||
|
||
loop = false;
|
||
last = -1;
|
||
|
||
symdef = symdefs;
|
||
symdefend = symdef + c;
|
||
for (i = 0; symdef < symdefend; symdef++, i++)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
bfd *element;
|
||
struct bfd_link_hash_entry *undefs_tail;
|
||
symindex mark;
|
||
|
||
if (defined[i] || included[i])
|
||
continue;
|
||
if (symdef->file_offset == last)
|
||
{
|
||
included[i] = true;
|
||
continue;
|
||
}
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
|
||
false, false, false);
|
||
|
||
if (h == NULL)
|
||
{
|
||
char *p, *copy;
|
||
|
||
/* If this is a default version (the name contains @@),
|
||
look up the symbol again without the version. The
|
||
effect is that references to the symbol without the
|
||
version will be matched by the default symbol in the
|
||
archive. */
|
||
|
||
p = strchr (symdef->name, ELF_VER_CHR);
|
||
if (p == NULL || p[1] != ELF_VER_CHR)
|
||
continue;
|
||
|
||
copy = bfd_alloc (abfd, p - symdef->name + 1);
|
||
if (copy == NULL)
|
||
goto error_return;
|
||
memcpy (copy, symdef->name, p - symdef->name);
|
||
copy[p - symdef->name] = '\0';
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), copy,
|
||
false, false, false);
|
||
|
||
bfd_release (abfd, copy);
|
||
}
|
||
|
||
if (h == NULL)
|
||
continue;
|
||
|
||
if (h->root.type != bfd_link_hash_undefined)
|
||
{
|
||
if (h->root.type != bfd_link_hash_undefweak)
|
||
defined[i] = true;
|
||
continue;
|
||
}
|
||
|
||
/* We need to include this archive member. */
|
||
|
||
element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
|
||
if (element == (bfd *) NULL)
|
||
goto error_return;
|
||
|
||
if (! bfd_check_format (element, bfd_object))
|
||
goto error_return;
|
||
|
||
/* Doublecheck that we have not included this object
|
||
already--it should be impossible, but there may be
|
||
something wrong with the archive. */
|
||
if (element->archive_pass != 0)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
element->archive_pass = 1;
|
||
|
||
undefs_tail = info->hash->undefs_tail;
|
||
|
||
if (! (*info->callbacks->add_archive_element) (info, element,
|
||
symdef->name))
|
||
goto error_return;
|
||
if (! elf_link_add_object_symbols (element, info))
|
||
goto error_return;
|
||
|
||
/* If there are any new undefined symbols, we need to make
|
||
another pass through the archive in order to see whether
|
||
they can be defined. FIXME: This isn't perfect, because
|
||
common symbols wind up on undefs_tail and because an
|
||
undefined symbol which is defined later on in this pass
|
||
does not require another pass. This isn't a bug, but it
|
||
does make the code less efficient than it could be. */
|
||
if (undefs_tail != info->hash->undefs_tail)
|
||
loop = true;
|
||
|
||
/* Look backward to mark all symbols from this object file
|
||
which we have already seen in this pass. */
|
||
mark = i;
|
||
do
|
||
{
|
||
included[mark] = true;
|
||
if (mark == 0)
|
||
break;
|
||
--mark;
|
||
}
|
||
while (symdefs[mark].file_offset == symdef->file_offset);
|
||
|
||
/* We mark subsequent symbols from this object file as we go
|
||
on through the loop. */
|
||
last = symdef->file_offset;
|
||
}
|
||
}
|
||
while (loop);
|
||
|
||
free (defined);
|
||
free (included);
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (defined != (boolean *) NULL)
|
||
free (defined);
|
||
if (included != (boolean *) NULL)
|
||
free (included);
|
||
return false;
|
||
}
|
||
|
||
/* This function is called when we want to define a new symbol. It
|
||
handles the various cases which arise when we find a definition in
|
||
a dynamic object, or when there is already a definition in a
|
||
dynamic object. The new symbol is described by NAME, SYM, PSEC,
|
||
and PVALUE. We set SYM_HASH to the hash table entry. We set
|
||
OVERRIDE if the old symbol is overriding a new definition. We set
|
||
TYPE_CHANGE_OK if it is OK for the type to change. We set
|
||
SIZE_CHANGE_OK if it is OK for the size to change. By OK to
|
||
change, we mean that we shouldn't warn if the type or size does
|
||
change. */
|
||
|
||
static boolean
|
||
elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
|
||
override, type_change_ok, size_change_ok)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
const char *name;
|
||
Elf_Internal_Sym *sym;
|
||
asection **psec;
|
||
bfd_vma *pvalue;
|
||
struct elf_link_hash_entry **sym_hash;
|
||
boolean *override;
|
||
boolean *type_change_ok;
|
||
boolean *size_change_ok;
|
||
{
|
||
asection *sec;
|
||
struct elf_link_hash_entry *h;
|
||
int bind;
|
||
bfd *oldbfd;
|
||
boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
|
||
|
||
*override = false;
|
||
|
||
sec = *psec;
|
||
bind = ELF_ST_BIND (sym->st_info);
|
||
|
||
if (! bfd_is_und_section (sec))
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
|
||
else
|
||
h = ((struct elf_link_hash_entry *)
|
||
bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
|
||
if (h == NULL)
|
||
return false;
|
||
*sym_hash = h;
|
||
|
||
/* This code is for coping with dynamic objects, and is only useful
|
||
if we are doing an ELF link. */
|
||
if (info->hash->creator != abfd->xvec)
|
||
return true;
|
||
|
||
/* For merging, we only care about real symbols. */
|
||
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* If we just created the symbol, mark it as being an ELF symbol.
|
||
Other than that, there is nothing to do--there is no merge issue
|
||
with a newly defined symbol--so we just return. */
|
||
|
||
if (h->root.type == bfd_link_hash_new)
|
||
{
|
||
h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
|
||
return true;
|
||
}
|
||
|
||
/* OLDBFD is a BFD associated with the existing symbol. */
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
oldbfd = NULL;
|
||
break;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
oldbfd = h->root.u.undef.abfd;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
oldbfd = h->root.u.def.section->owner;
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
oldbfd = h->root.u.c.p->section->owner;
|
||
break;
|
||
}
|
||
|
||
/* NEWDYN and OLDDYN indicate whether the new or old symbol,
|
||
respectively, is from a dynamic object. */
|
||
|
||
if ((abfd->flags & DYNAMIC) != 0)
|
||
newdyn = true;
|
||
else
|
||
newdyn = false;
|
||
|
||
if (oldbfd == NULL || (oldbfd->flags & DYNAMIC) == 0)
|
||
olddyn = false;
|
||
else
|
||
olddyn = true;
|
||
|
||
/* NEWDEF and OLDDEF indicate whether the new or old symbol,
|
||
respectively, appear to be a definition rather than reference. */
|
||
|
||
if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
|
||
newdef = false;
|
||
else
|
||
newdef = true;
|
||
|
||
if (h->root.type == bfd_link_hash_undefined
|
||
|| h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_common)
|
||
olddef = false;
|
||
else
|
||
olddef = true;
|
||
|
||
/* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
|
||
symbol, respectively, appears to be a common symbol in a dynamic
|
||
object. If a symbol appears in an uninitialized section, and is
|
||
not weak, and is not a function, then it may be a common symbol
|
||
which was resolved when the dynamic object was created. We want
|
||
to treat such symbols specially, because they raise special
|
||
considerations when setting the symbol size: if the symbol
|
||
appears as a common symbol in a regular object, and the size in
|
||
the regular object is larger, we must make sure that we use the
|
||
larger size. This problematic case can always be avoided in C,
|
||
but it must be handled correctly when using Fortran shared
|
||
libraries.
|
||
|
||
Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
|
||
likewise for OLDDYNCOMMON and OLDDEF.
|
||
|
||
Note that this test is just a heuristic, and that it is quite
|
||
possible to have an uninitialized symbol in a shared object which
|
||
is really a definition, rather than a common symbol. This could
|
||
lead to some minor confusion when the symbol really is a common
|
||
symbol in some regular object. However, I think it will be
|
||
harmless. */
|
||
|
||
if (newdyn
|
||
&& newdef
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& (sec->flags & SEC_LOAD) == 0
|
||
&& sym->st_size > 0
|
||
&& bind != STB_WEAK
|
||
&& ELF_ST_TYPE (sym->st_info) != STT_FUNC)
|
||
newdyncommon = true;
|
||
else
|
||
newdyncommon = false;
|
||
|
||
if (olddyn
|
||
&& olddef
|
||
&& h->root.type == bfd_link_hash_defined
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
&& (h->root.u.def.section->flags & SEC_ALLOC) != 0
|
||
&& (h->root.u.def.section->flags & SEC_LOAD) == 0
|
||
&& h->size > 0
|
||
&& h->type != STT_FUNC)
|
||
olddyncommon = true;
|
||
else
|
||
olddyncommon = false;
|
||
|
||
/* It's OK to change the type if either the existing symbol or the
|
||
new symbol is weak. */
|
||
|
||
if (h->root.type == bfd_link_hash_defweak
|
||
|| h->root.type == bfd_link_hash_undefweak
|
||
|| bind == STB_WEAK)
|
||
*type_change_ok = true;
|
||
|
||
/* It's OK to change the size if either the existing symbol or the
|
||
new symbol is weak, or if the old symbol is undefined. */
|
||
|
||
if (*type_change_ok
|
||
|| h->root.type == bfd_link_hash_undefined)
|
||
*size_change_ok = true;
|
||
|
||
/* If both the old and the new symbols look like common symbols in a
|
||
dynamic object, set the size of the symbol to the larger of the
|
||
two. */
|
||
|
||
if (olddyncommon
|
||
&& newdyncommon
|
||
&& sym->st_size != h->size)
|
||
{
|
||
/* Since we think we have two common symbols, issue a multiple
|
||
common warning if desired. Note that we only warn if the
|
||
size is different. If the size is the same, we simply let
|
||
the old symbol override the new one as normally happens with
|
||
symbols defined in dynamic objects. */
|
||
|
||
if (! ((*info->callbacks->multiple_common)
|
||
(info, h->root.root.string, oldbfd, bfd_link_hash_common,
|
||
h->size, abfd, bfd_link_hash_common, sym->st_size)))
|
||
return false;
|
||
|
||
if (sym->st_size > h->size)
|
||
h->size = sym->st_size;
|
||
|
||
*size_change_ok = true;
|
||
}
|
||
|
||
/* If we are looking at a dynamic object, and we have found a
|
||
definition, we need to see if the symbol was already defined by
|
||
some other object. If so, we want to use the existing
|
||
definition, and we do not want to report a multiple symbol
|
||
definition error; we do this by clobbering *PSEC to be
|
||
bfd_und_section_ptr.
|
||
|
||
We treat a common symbol as a definition if the symbol in the
|
||
shared library is a function, since common symbols always
|
||
represent variables; this can cause confusion in principle, but
|
||
any such confusion would seem to indicate an erroneous program or
|
||
shared library. We also permit a common symbol in a regular
|
||
object to override a weak symbol in a shared object. */
|
||
|
||
if (newdyn
|
||
&& newdef
|
||
&& (olddef
|
||
|| (h->root.type == bfd_link_hash_common
|
||
&& (bind == STB_WEAK
|
||
|| ELF_ST_TYPE (sym->st_info) == STT_FUNC))))
|
||
{
|
||
*override = true;
|
||
newdef = false;
|
||
newdyncommon = false;
|
||
|
||
*psec = sec = bfd_und_section_ptr;
|
||
*size_change_ok = true;
|
||
|
||
/* If we get here when the old symbol is a common symbol, then
|
||
we are explicitly letting it override a weak symbol or
|
||
function in a dynamic object, and we don't want to warn about
|
||
a type change. If the old symbol is a defined symbol, a type
|
||
change warning may still be appropriate. */
|
||
|
||
if (h->root.type == bfd_link_hash_common)
|
||
*type_change_ok = true;
|
||
}
|
||
|
||
/* Handle the special case of an old common symbol merging with a
|
||
new symbol which looks like a common symbol in a shared object.
|
||
We change *PSEC and *PVALUE to make the new symbol look like a
|
||
common symbol, and let _bfd_generic_link_add_one_symbol will do
|
||
the right thing. */
|
||
|
||
if (newdyncommon
|
||
&& h->root.type == bfd_link_hash_common)
|
||
{
|
||
*override = true;
|
||
newdef = false;
|
||
newdyncommon = false;
|
||
*pvalue = sym->st_size;
|
||
*psec = sec = bfd_com_section_ptr;
|
||
*size_change_ok = true;
|
||
}
|
||
|
||
/* If the old symbol is from a dynamic object, and the new symbol is
|
||
a definition which is not from a dynamic object, then the new
|
||
symbol overrides the old symbol. Symbols from regular files
|
||
always take precedence over symbols from dynamic objects, even if
|
||
they are defined after the dynamic object in the link.
|
||
|
||
As above, we again permit a common symbol in a regular object to
|
||
override a definition in a shared object if the shared object
|
||
symbol is a function or is weak. */
|
||
|
||
if (! newdyn
|
||
&& (newdef
|
||
|| (bfd_is_com_section (sec)
|
||
&& (h->root.type == bfd_link_hash_defweak
|
||
|| h->type == STT_FUNC)))
|
||
&& olddyn
|
||
&& olddef
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
|
||
{
|
||
/* Change the hash table entry to undefined, and let
|
||
_bfd_generic_link_add_one_symbol do the right thing with the
|
||
new definition. */
|
||
|
||
h->root.type = bfd_link_hash_undefined;
|
||
h->root.u.undef.abfd = h->root.u.def.section->owner;
|
||
*size_change_ok = true;
|
||
|
||
olddef = false;
|
||
olddyncommon = false;
|
||
|
||
/* We again permit a type change when a common symbol may be
|
||
overriding a function. */
|
||
|
||
if (bfd_is_com_section (sec))
|
||
*type_change_ok = true;
|
||
|
||
/* This union may have been set to be non-NULL when this symbol
|
||
was seen in a dynamic object. We must force the union to be
|
||
NULL, so that it is correct for a regular symbol. */
|
||
|
||
h->verinfo.vertree = NULL;
|
||
|
||
/* In this special case, if H is the target of an indirection,
|
||
we want the caller to frob with H rather than with the
|
||
indirect symbol. That will permit the caller to redefine the
|
||
target of the indirection, rather than the indirect symbol
|
||
itself. FIXME: This will break the -y option if we store a
|
||
symbol with a different name. */
|
||
*sym_hash = h;
|
||
}
|
||
|
||
/* Handle the special case of a new common symbol merging with an
|
||
old symbol that looks like it might be a common symbol defined in
|
||
a shared object. Note that we have already handled the case in
|
||
which a new common symbol should simply override the definition
|
||
in the shared library. */
|
||
|
||
if (! newdyn
|
||
&& bfd_is_com_section (sec)
|
||
&& olddyncommon)
|
||
{
|
||
/* It would be best if we could set the hash table entry to a
|
||
common symbol, but we don't know what to use for the section
|
||
or the alignment. */
|
||
if (! ((*info->callbacks->multiple_common)
|
||
(info, h->root.root.string, oldbfd, bfd_link_hash_common,
|
||
h->size, abfd, bfd_link_hash_common, sym->st_size)))
|
||
return false;
|
||
|
||
/* If the predumed common symbol in the dynamic object is
|
||
larger, pretend that the new symbol has its size. */
|
||
|
||
if (h->size > *pvalue)
|
||
*pvalue = h->size;
|
||
|
||
/* FIXME: We no longer know the alignment required by the symbol
|
||
in the dynamic object, so we just wind up using the one from
|
||
the regular object. */
|
||
|
||
olddef = false;
|
||
olddyncommon = false;
|
||
|
||
h->root.type = bfd_link_hash_undefined;
|
||
h->root.u.undef.abfd = h->root.u.def.section->owner;
|
||
|
||
*size_change_ok = true;
|
||
*type_change_ok = true;
|
||
|
||
h->verinfo.vertree = NULL;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Add symbols from an ELF object file to the linker hash table. */
|
||
|
||
static boolean
|
||
elf_link_add_object_symbols (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
|
||
const Elf_Internal_Sym *,
|
||
const char **, flagword *,
|
||
asection **, bfd_vma *));
|
||
boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
|
||
asection *, const Elf_Internal_Rela *));
|
||
boolean collect;
|
||
Elf_Internal_Shdr *hdr;
|
||
size_t symcount;
|
||
size_t extsymcount;
|
||
size_t extsymoff;
|
||
Elf_External_Sym *buf = NULL;
|
||
struct elf_link_hash_entry **sym_hash;
|
||
boolean dynamic;
|
||
bfd_byte *dynver = NULL;
|
||
Elf_External_Versym *extversym = NULL;
|
||
Elf_External_Versym *ever;
|
||
Elf_External_Dyn *dynbuf = NULL;
|
||
struct elf_link_hash_entry *weaks;
|
||
Elf_External_Sym *esym;
|
||
Elf_External_Sym *esymend;
|
||
|
||
add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook;
|
||
collect = get_elf_backend_data (abfd)->collect;
|
||
|
||
if ((abfd->flags & DYNAMIC) == 0)
|
||
dynamic = false;
|
||
else
|
||
{
|
||
dynamic = true;
|
||
|
||
/* You can't use -r against a dynamic object. Also, there's no
|
||
hope of using a dynamic object which does not exactly match
|
||
the format of the output file. */
|
||
if (info->relocateable || info->hash->creator != abfd->xvec)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* As a GNU extension, any input sections which are named
|
||
.gnu.warning.SYMBOL are treated as warning symbols for the given
|
||
symbol. This differs from .gnu.warning sections, which generate
|
||
warnings when they are included in an output file. */
|
||
if (! info->shared)
|
||
{
|
||
asection *s;
|
||
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
const char *name;
|
||
|
||
name = bfd_get_section_name (abfd, s);
|
||
if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
|
||
{
|
||
char *msg;
|
||
bfd_size_type sz;
|
||
|
||
name += sizeof ".gnu.warning." - 1;
|
||
|
||
/* If this is a shared object, then look up the symbol
|
||
in the hash table. If it is there, and it is already
|
||
been defined, then we will not be using the entry
|
||
from this shared object, so we don't need to warn.
|
||
FIXME: If we see the definition in a regular object
|
||
later on, we will warn, but we shouldn't. The only
|
||
fix is to keep track of what warnings we are supposed
|
||
to emit, and then handle them all at the end of the
|
||
link. */
|
||
if (dynamic && abfd->xvec == info->hash->creator)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name,
|
||
false, false, true);
|
||
|
||
/* FIXME: What about bfd_link_hash_common? */
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
/* We don't want to issue this warning. Clobber
|
||
the section size so that the warning does not
|
||
get copied into the output file. */
|
||
s->_raw_size = 0;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
sz = bfd_section_size (abfd, s);
|
||
msg = (char *) bfd_alloc (abfd, sz + 1);
|
||
if (msg == NULL)
|
||
goto error_return;
|
||
|
||
if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
|
||
goto error_return;
|
||
|
||
msg[sz] = '\0';
|
||
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
|
||
false, collect, (struct bfd_link_hash_entry **) NULL)))
|
||
goto error_return;
|
||
|
||
if (! info->relocateable)
|
||
{
|
||
/* Clobber the section size so that the warning does
|
||
not get copied into the output file. */
|
||
s->_raw_size = 0;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If this is a dynamic object, we always link against the .dynsym
|
||
symbol table, not the .symtab symbol table. The dynamic linker
|
||
will only see the .dynsym symbol table, so there is no reason to
|
||
look at .symtab for a dynamic object. */
|
||
|
||
if (! dynamic || elf_dynsymtab (abfd) == 0)
|
||
hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
else
|
||
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
|
||
|
||
if (dynamic)
|
||
{
|
||
/* Read in any version definitions. */
|
||
|
||
if (! _bfd_elf_slurp_version_tables (abfd))
|
||
goto error_return;
|
||
|
||
/* Read in the symbol versions, but don't bother to convert them
|
||
to internal format. */
|
||
if (elf_dynversym (abfd) != 0)
|
||
{
|
||
Elf_Internal_Shdr *versymhdr;
|
||
|
||
versymhdr = &elf_tdata (abfd)->dynversym_hdr;
|
||
extversym = (Elf_External_Versym *) bfd_malloc (hdr->sh_size);
|
||
if (extversym == NULL)
|
||
goto error_return;
|
||
if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd)
|
||
!= versymhdr->sh_size))
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols at
|
||
this point. */
|
||
if (elf_bad_symtab (abfd))
|
||
{
|
||
extsymcount = symcount;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
extsymcount = symcount - hdr->sh_info;
|
||
extsymoff = hdr->sh_info;
|
||
}
|
||
|
||
buf = ((Elf_External_Sym *)
|
||
bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
|
||
if (buf == NULL && extsymcount != 0)
|
||
goto error_return;
|
||
|
||
/* We store a pointer to the hash table entry for each external
|
||
symbol. */
|
||
sym_hash = ((struct elf_link_hash_entry **)
|
||
bfd_alloc (abfd,
|
||
extsymcount * sizeof (struct elf_link_hash_entry *)));
|
||
if (sym_hash == NULL)
|
||
goto error_return;
|
||
elf_sym_hashes (abfd) = sym_hash;
|
||
|
||
if (! dynamic)
|
||
{
|
||
/* If we are creating a shared library, create all the dynamic
|
||
sections immediately. We need to attach them to something,
|
||
so we attach them to this BFD, provided it is the right
|
||
format. FIXME: If there are no input BFD's of the same
|
||
format as the output, we can't make a shared library. */
|
||
if (info->shared
|
||
&& ! elf_hash_table (info)->dynamic_sections_created
|
||
&& abfd->xvec == info->hash->creator)
|
||
{
|
||
if (! elf_link_create_dynamic_sections (abfd, info))
|
||
goto error_return;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
asection *s;
|
||
boolean add_needed;
|
||
const char *name;
|
||
bfd_size_type oldsize;
|
||
bfd_size_type strindex;
|
||
|
||
/* Find the name to use in a DT_NEEDED entry that refers to this
|
||
object. If the object has a DT_SONAME entry, we use it.
|
||
Otherwise, if the generic linker stuck something in
|
||
elf_dt_name, we use that. Otherwise, we just use the file
|
||
name. If the generic linker put a null string into
|
||
elf_dt_name, we don't make a DT_NEEDED entry at all, even if
|
||
there is a DT_SONAME entry. */
|
||
add_needed = true;
|
||
name = bfd_get_filename (abfd);
|
||
if (elf_dt_name (abfd) != NULL)
|
||
{
|
||
name = elf_dt_name (abfd);
|
||
if (*name == '\0')
|
||
add_needed = false;
|
||
}
|
||
s = bfd_get_section_by_name (abfd, ".dynamic");
|
||
if (s != NULL)
|
||
{
|
||
Elf_External_Dyn *extdyn;
|
||
Elf_External_Dyn *extdynend;
|
||
int elfsec;
|
||
unsigned long link;
|
||
|
||
dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
|
||
if (dynbuf == NULL)
|
||
goto error_return;
|
||
|
||
if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
|
||
(file_ptr) 0, s->_raw_size))
|
||
goto error_return;
|
||
|
||
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
|
||
if (elfsec == -1)
|
||
goto error_return;
|
||
link = elf_elfsections (abfd)[elfsec]->sh_link;
|
||
|
||
extdyn = dynbuf;
|
||
extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
|
||
for (; extdyn < extdynend; extdyn++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
elf_swap_dyn_in (abfd, extdyn, &dyn);
|
||
if (dyn.d_tag == DT_SONAME)
|
||
{
|
||
name = bfd_elf_string_from_elf_section (abfd, link,
|
||
dyn.d_un.d_val);
|
||
if (name == NULL)
|
||
goto error_return;
|
||
}
|
||
if (dyn.d_tag == DT_NEEDED)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
|
||
n = ((struct bfd_link_needed_list *)
|
||
bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
|
||
fnm = bfd_elf_string_from_elf_section (abfd, link,
|
||
dyn.d_un.d_val);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_return;
|
||
anm = bfd_alloc (abfd, strlen (fnm) + 1);
|
||
if (anm == NULL)
|
||
goto error_return;
|
||
strcpy (anm, fnm);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = &elf_hash_table (info)->needed;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
}
|
||
|
||
free (dynbuf);
|
||
dynbuf = NULL;
|
||
}
|
||
|
||
/* We do not want to include any of the sections in a dynamic
|
||
object in the output file. We hack by simply clobbering the
|
||
list of sections in the BFD. This could be handled more
|
||
cleanly by, say, a new section flag; the existing
|
||
SEC_NEVER_LOAD flag is not the one we want, because that one
|
||
still implies that the section takes up space in the output
|
||
file. */
|
||
abfd->sections = NULL;
|
||
abfd->section_count = 0;
|
||
|
||
/* If this is the first dynamic object found in the link, create
|
||
the special sections required for dynamic linking. */
|
||
if (! elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
if (! elf_link_create_dynamic_sections (abfd, info))
|
||
goto error_return;
|
||
}
|
||
|
||
if (add_needed)
|
||
{
|
||
/* Add a DT_NEEDED entry for this dynamic object. */
|
||
oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
|
||
strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
|
||
true, false);
|
||
if (strindex == (bfd_size_type) -1)
|
||
goto error_return;
|
||
|
||
if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
|
||
{
|
||
asection *sdyn;
|
||
Elf_External_Dyn *dyncon, *dynconend;
|
||
|
||
/* The hash table size did not change, which means that
|
||
the dynamic object name was already entered. If we
|
||
have already included this dynamic object in the
|
||
link, just ignore it. There is no reason to include
|
||
a particular dynamic object more than once. */
|
||
sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
|
||
".dynamic");
|
||
BFD_ASSERT (sdyn != NULL);
|
||
|
||
dyncon = (Elf_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf_External_Dyn *) (sdyn->contents +
|
||
sdyn->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
|
||
&dyn);
|
||
if (dyn.d_tag == DT_NEEDED
|
||
&& dyn.d_un.d_val == strindex)
|
||
{
|
||
if (buf != NULL)
|
||
free (buf);
|
||
if (extversym != NULL)
|
||
free (extversym);
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
|
||
goto error_return;
|
||
}
|
||
|
||
/* Save the SONAME, if there is one, because sometimes the
|
||
linker emulation code will need to know it. */
|
||
if (*name == '\0')
|
||
name = bfd_get_filename (abfd);
|
||
elf_dt_name (abfd) = name;
|
||
}
|
||
|
||
if (bfd_seek (abfd,
|
||
hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
|
||
SEEK_SET) != 0
|
||
|| (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
|
||
!= extsymcount * sizeof (Elf_External_Sym)))
|
||
goto error_return;
|
||
|
||
weaks = NULL;
|
||
|
||
ever = extversym != NULL ? extversym + extsymoff : NULL;
|
||
esymend = buf + extsymcount;
|
||
for (esym = buf;
|
||
esym < esymend;
|
||
esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
|
||
{
|
||
Elf_Internal_Sym sym;
|
||
int bind;
|
||
bfd_vma value;
|
||
asection *sec;
|
||
flagword flags;
|
||
const char *name;
|
||
struct elf_link_hash_entry *h;
|
||
boolean definition;
|
||
boolean size_change_ok, type_change_ok;
|
||
boolean new_weakdef;
|
||
unsigned int old_alignment;
|
||
|
||
elf_swap_symbol_in (abfd, esym, &sym);
|
||
|
||
flags = BSF_NO_FLAGS;
|
||
sec = NULL;
|
||
value = sym.st_value;
|
||
*sym_hash = NULL;
|
||
|
||
bind = ELF_ST_BIND (sym.st_info);
|
||
if (bind == STB_LOCAL)
|
||
{
|
||
/* This should be impossible, since ELF requires that all
|
||
global symbols follow all local symbols, and that sh_info
|
||
point to the first global symbol. Unfortunatealy, Irix 5
|
||
screws this up. */
|
||
continue;
|
||
}
|
||
else if (bind == STB_GLOBAL)
|
||
{
|
||
if (sym.st_shndx != SHN_UNDEF
|
||
&& sym.st_shndx != SHN_COMMON)
|
||
flags = BSF_GLOBAL;
|
||
else
|
||
flags = 0;
|
||
}
|
||
else if (bind == STB_WEAK)
|
||
flags = BSF_WEAK;
|
||
else
|
||
{
|
||
/* Leave it up to the processor backend. */
|
||
}
|
||
|
||
if (sym.st_shndx == SHN_UNDEF)
|
||
sec = bfd_und_section_ptr;
|
||
else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
|
||
{
|
||
sec = section_from_elf_index (abfd, sym.st_shndx);
|
||
if (sec == NULL)
|
||
sec = bfd_abs_section_ptr;
|
||
else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
value -= sec->vma;
|
||
}
|
||
else if (sym.st_shndx == SHN_ABS)
|
||
sec = bfd_abs_section_ptr;
|
||
else if (sym.st_shndx == SHN_COMMON)
|
||
{
|
||
sec = bfd_com_section_ptr;
|
||
/* What ELF calls the size we call the value. What ELF
|
||
calls the value we call the alignment. */
|
||
value = sym.st_size;
|
||
}
|
||
else
|
||
{
|
||
/* Leave it up to the processor backend. */
|
||
}
|
||
|
||
name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
|
||
if (name == (const char *) NULL)
|
||
goto error_return;
|
||
|
||
if (add_symbol_hook)
|
||
{
|
||
if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
|
||
&value))
|
||
goto error_return;
|
||
|
||
/* The hook function sets the name to NULL if this symbol
|
||
should be skipped for some reason. */
|
||
if (name == (const char *) NULL)
|
||
continue;
|
||
}
|
||
|
||
/* Sanity check that all possibilities were handled. */
|
||
if (sec == (asection *) NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
|
||
if (bfd_is_und_section (sec)
|
||
|| bfd_is_com_section (sec))
|
||
definition = false;
|
||
else
|
||
definition = true;
|
||
|
||
size_change_ok = false;
|
||
type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
|
||
old_alignment = 0;
|
||
if (info->hash->creator->flavour == bfd_target_elf_flavour)
|
||
{
|
||
Elf_Internal_Versym iver;
|
||
unsigned int vernum = 0;
|
||
boolean override;
|
||
|
||
if (ever != NULL)
|
||
{
|
||
_bfd_elf_swap_versym_in (abfd, ever, &iver);
|
||
vernum = iver.vs_vers & VERSYM_VERSION;
|
||
|
||
/* If this is a hidden symbol, or if it is not version
|
||
1, we append the version name to the symbol name.
|
||
However, we do not modify a non-hidden absolute
|
||
symbol, because it might be the version symbol
|
||
itself. FIXME: What if it isn't? */
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) != 0
|
||
|| (vernum > 1 && ! bfd_is_abs_section (sec)))
|
||
{
|
||
const char *verstr;
|
||
int namelen, newlen;
|
||
char *newname, *p;
|
||
|
||
if (sym.st_shndx != SHN_UNDEF)
|
||
{
|
||
if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: %s: invalid version %u (max %d)"),
|
||
abfd->filename, name, vernum,
|
||
elf_tdata (abfd)->dynverdef_hdr.sh_info);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
else if (vernum > 1)
|
||
verstr =
|
||
elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
|
||
else
|
||
verstr = "";
|
||
}
|
||
else
|
||
{
|
||
/* We cannot simply test for the number of
|
||
entries in the VERNEED section since the
|
||
numbers for the needed versions do not start
|
||
at 0. */
|
||
Elf_Internal_Verneed *t;
|
||
|
||
verstr = NULL;
|
||
for (t = elf_tdata (abfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
{
|
||
if (a->vna_other == vernum)
|
||
{
|
||
verstr = a->vna_nodename;
|
||
break;
|
||
}
|
||
}
|
||
if (a != NULL)
|
||
break;
|
||
}
|
||
if (verstr == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: %s: invalid needed version %d"),
|
||
abfd->filename, name, vernum);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
namelen = strlen (name);
|
||
newlen = namelen + strlen (verstr) + 2;
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
|
||
++newlen;
|
||
|
||
newname = (char *) bfd_alloc (abfd, newlen);
|
||
if (newname == NULL)
|
||
goto error_return;
|
||
strcpy (newname, name);
|
||
p = newname + namelen;
|
||
*p++ = ELF_VER_CHR;
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
|
||
*p++ = ELF_VER_CHR;
|
||
strcpy (p, verstr);
|
||
|
||
name = newname;
|
||
}
|
||
}
|
||
|
||
if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
|
||
sym_hash, &override, &type_change_ok,
|
||
&size_change_ok))
|
||
goto error_return;
|
||
|
||
if (override)
|
||
definition = false;
|
||
|
||
h = *sym_hash;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* Remember the old alignment if this is a common symbol, so
|
||
that we don't reduce the alignment later on. We can't
|
||
check later, because _bfd_generic_link_add_one_symbol
|
||
will set a default for the alignment which we want to
|
||
override. */
|
||
if (h->root.type == bfd_link_hash_common)
|
||
old_alignment = h->root.u.c.p->alignment_power;
|
||
|
||
if (elf_tdata (abfd)->verdef != NULL
|
||
&& ! override
|
||
&& vernum > 1
|
||
&& definition)
|
||
h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
|
||
}
|
||
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, name, flags, sec, value, (const char *) NULL,
|
||
false, collect, (struct bfd_link_hash_entry **) sym_hash)))
|
||
goto error_return;
|
||
|
||
h = *sym_hash;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
*sym_hash = h;
|
||
|
||
new_weakdef = false;
|
||
if (dynamic
|
||
&& definition
|
||
&& (flags & BSF_WEAK) != 0
|
||
&& ELF_ST_TYPE (sym.st_info) != STT_FUNC
|
||
&& info->hash->creator->flavour == bfd_target_elf_flavour
|
||
&& h->weakdef == NULL)
|
||
{
|
||
/* Keep a list of all weak defined non function symbols from
|
||
a dynamic object, using the weakdef field. Later in this
|
||
function we will set the weakdef field to the correct
|
||
value. We only put non-function symbols from dynamic
|
||
objects on this list, because that happens to be the only
|
||
time we need to know the normal symbol corresponding to a
|
||
weak symbol, and the information is time consuming to
|
||
figure out. If the weakdef field is not already NULL,
|
||
then this symbol was already defined by some previous
|
||
dynamic object, and we will be using that previous
|
||
definition anyhow. */
|
||
|
||
h->weakdef = weaks;
|
||
weaks = h;
|
||
new_weakdef = true;
|
||
}
|
||
|
||
/* Set the alignment of a common symbol. */
|
||
if (sym.st_shndx == SHN_COMMON
|
||
&& h->root.type == bfd_link_hash_common)
|
||
{
|
||
unsigned int align;
|
||
|
||
align = bfd_log2 (sym.st_value);
|
||
if (align > old_alignment)
|
||
h->root.u.c.p->alignment_power = align;
|
||
}
|
||
|
||
if (info->hash->creator->flavour == bfd_target_elf_flavour)
|
||
{
|
||
int old_flags;
|
||
boolean dynsym;
|
||
int new_flag;
|
||
|
||
/* Remember the symbol size and type. */
|
||
if (sym.st_size != 0
|
||
&& (definition || h->size == 0))
|
||
{
|
||
if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
|
||
name, (unsigned long) h->size, (unsigned long) sym.st_size,
|
||
bfd_get_filename (abfd));
|
||
|
||
h->size = sym.st_size;
|
||
}
|
||
|
||
/* If this is a common symbol, then we always want H->SIZE
|
||
to be the size of the common symbol. The code just above
|
||
won't fix the size if a common symbol becomes larger. We
|
||
don't warn about a size change here, because that is
|
||
covered by --warn-common. */
|
||
if (h->root.type == bfd_link_hash_common)
|
||
h->size = h->root.u.c.size;
|
||
|
||
if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
|
||
&& (definition || h->type == STT_NOTYPE))
|
||
{
|
||
if (h->type != STT_NOTYPE
|
||
&& h->type != ELF_ST_TYPE (sym.st_info)
|
||
&& ! type_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: type of symbol `%s' changed from %d to %d in %s"),
|
||
name, h->type, ELF_ST_TYPE (sym.st_info),
|
||
bfd_get_filename (abfd));
|
||
|
||
h->type = ELF_ST_TYPE (sym.st_info);
|
||
}
|
||
|
||
if (sym.st_other != 0
|
||
&& (definition || h->other == 0))
|
||
h->other = sym.st_other;
|
||
|
||
/* Set a flag in the hash table entry indicating the type of
|
||
reference or definition we just found. Keep a count of
|
||
the number of dynamic symbols we find. A dynamic symbol
|
||
is one which is referenced or defined by both a regular
|
||
object and a shared object. */
|
||
old_flags = h->elf_link_hash_flags;
|
||
dynsym = false;
|
||
if (! dynamic)
|
||
{
|
||
if (! definition)
|
||
new_flag = ELF_LINK_HASH_REF_REGULAR;
|
||
else
|
||
new_flag = ELF_LINK_HASH_DEF_REGULAR;
|
||
if (info->shared
|
||
|| (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
|
||
| ELF_LINK_HASH_REF_DYNAMIC)) != 0)
|
||
dynsym = true;
|
||
}
|
||
else
|
||
{
|
||
if (! definition)
|
||
new_flag = ELF_LINK_HASH_REF_DYNAMIC;
|
||
else
|
||
new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
|
||
if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
|
||
| ELF_LINK_HASH_REF_REGULAR)) != 0
|
||
|| (h->weakdef != NULL
|
||
&& ! new_weakdef
|
||
&& h->weakdef->dynindx != -1))
|
||
dynsym = true;
|
||
}
|
||
|
||
h->elf_link_hash_flags |= new_flag;
|
||
|
||
/* If this symbol has a version, and it is the default
|
||
version, we create an indirect symbol from the default
|
||
name to the fully decorated name. This will cause
|
||
external references which do not specify a version to be
|
||
bound to this version of the symbol. */
|
||
if (definition)
|
||
{
|
||
char *p;
|
||
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL && p[1] == ELF_VER_CHR)
|
||
{
|
||
char *shortname;
|
||
struct elf_link_hash_entry *hi;
|
||
boolean override;
|
||
|
||
shortname = bfd_hash_allocate (&info->hash->table,
|
||
p - name + 1);
|
||
if (shortname == NULL)
|
||
goto error_return;
|
||
strncpy (shortname, name, p - name);
|
||
shortname[p - name] = '\0';
|
||
|
||
/* We are going to create a new symbol. Merge it
|
||
with any existing symbol with this name. For the
|
||
purposes of the merge, act as though we were
|
||
defining the symbol we just defined, although we
|
||
actually going to define an indirect symbol. */
|
||
type_change_ok = false;
|
||
size_change_ok = false;
|
||
if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
|
||
&value, &hi, &override,
|
||
&type_change_ok, &size_change_ok))
|
||
goto error_return;
|
||
|
||
if (! override)
|
||
{
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, shortname, BSF_INDIRECT,
|
||
bfd_ind_section_ptr, (bfd_vma) 0, name, false,
|
||
collect, (struct bfd_link_hash_entry **) &hi)))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
/* In this case the symbol named SHORTNAME is
|
||
overriding the indirect symbol we want to
|
||
add. We were planning on making SHORTNAME an
|
||
indirect symbol referring to NAME. SHORTNAME
|
||
is the name without a version. NAME is the
|
||
fully versioned name, and it is the default
|
||
version.
|
||
|
||
Overriding means that we already saw a
|
||
definition for the symbol SHORTNAME in a
|
||
regular object, and it is overriding the
|
||
symbol defined in the dynamic object.
|
||
|
||
When this happens, we actually want to change
|
||
NAME, the symbol we just added, to refer to
|
||
SHORTNAME. This will cause references to
|
||
NAME in the shared object to become
|
||
references to SHORTNAME in the regular
|
||
object. This is what we expect when we
|
||
override a function in a shared object: that
|
||
the references in the shared object will be
|
||
mapped to the definition in the regular
|
||
object. */
|
||
|
||
while (hi->root.type == bfd_link_hash_indirect
|
||
|| hi->root.type == bfd_link_hash_warning)
|
||
hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
|
||
|
||
h->root.type = bfd_link_hash_indirect;
|
||
h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
|
||
if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
|
||
{
|
||
h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
|
||
hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
|
||
if (hi->elf_link_hash_flags
|
||
& (ELF_LINK_HASH_REF_REGULAR
|
||
| ELF_LINK_HASH_DEF_REGULAR))
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info,
|
||
hi))
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* Now set HI to H, so that the following code
|
||
will set the other fields correctly. */
|
||
hi = h;
|
||
}
|
||
|
||
/* If there is a duplicate definition somewhere,
|
||
then HI may not point to an indirect symbol. We
|
||
will have reported an error to the user in that
|
||
case. */
|
||
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
{
|
||
struct elf_link_hash_entry *ht;
|
||
|
||
/* If the symbol became indirect, then we assume
|
||
that we have not seen a definition before. */
|
||
BFD_ASSERT ((hi->elf_link_hash_flags
|
||
& (ELF_LINK_HASH_DEF_DYNAMIC
|
||
| ELF_LINK_HASH_DEF_REGULAR))
|
||
== 0);
|
||
|
||
ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
|
||
|
||
/* Copy down any references that we may have
|
||
already seen to the symbol which just became
|
||
indirect. */
|
||
ht->elf_link_hash_flags |=
|
||
(hi->elf_link_hash_flags
|
||
& (ELF_LINK_HASH_REF_DYNAMIC
|
||
| ELF_LINK_HASH_REF_REGULAR));
|
||
|
||
/* Copy over the global and procedure linkage table
|
||
offset entries. These may have been already set
|
||
up by a check_relocs routine. */
|
||
if (ht->got.offset == (bfd_vma) -1)
|
||
{
|
||
ht->got.offset = hi->got.offset;
|
||
hi->got.offset = (bfd_vma) -1;
|
||
}
|
||
BFD_ASSERT (hi->got.offset == (bfd_vma) -1);
|
||
|
||
if (ht->plt.offset == (bfd_vma) -1)
|
||
{
|
||
ht->plt.offset = hi->plt.offset;
|
||
hi->plt.offset = (bfd_vma) -1;
|
||
}
|
||
BFD_ASSERT (hi->plt.offset == (bfd_vma) -1);
|
||
|
||
if (ht->dynindx == -1)
|
||
{
|
||
ht->dynindx = hi->dynindx;
|
||
ht->dynstr_index = hi->dynstr_index;
|
||
hi->dynindx = -1;
|
||
hi->dynstr_index = 0;
|
||
}
|
||
BFD_ASSERT (hi->dynindx == -1);
|
||
|
||
/* FIXME: There may be other information to copy
|
||
over for particular targets. */
|
||
|
||
/* See if the new flags lead us to realize that
|
||
the symbol must be dynamic. */
|
||
if (! dynsym)
|
||
{
|
||
if (! dynamic)
|
||
{
|
||
if (info->shared
|
||
|| ((hi->elf_link_hash_flags
|
||
& ELF_LINK_HASH_REF_DYNAMIC)
|
||
!= 0))
|
||
dynsym = true;
|
||
}
|
||
else
|
||
{
|
||
if ((hi->elf_link_hash_flags
|
||
& ELF_LINK_HASH_REF_REGULAR) != 0)
|
||
dynsym = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We also need to define an indirection from the
|
||
nondefault version of the symbol. */
|
||
|
||
shortname = bfd_hash_allocate (&info->hash->table,
|
||
strlen (name));
|
||
if (shortname == NULL)
|
||
goto error_return;
|
||
strncpy (shortname, name, p - name);
|
||
strcpy (shortname + (p - name), p + 1);
|
||
|
||
/* Once again, merge with any existing symbol. */
|
||
type_change_ok = false;
|
||
size_change_ok = false;
|
||
if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
|
||
&value, &hi, &override,
|
||
&type_change_ok, &size_change_ok))
|
||
goto error_return;
|
||
|
||
if (override)
|
||
{
|
||
/* Here SHORTNAME is a versioned name, so we
|
||
don't expect to see the type of override we
|
||
do in the case above. */
|
||
(*_bfd_error_handler)
|
||
(_("%s: warning: unexpected redefinition of `%s'"),
|
||
bfd_get_filename (abfd), shortname);
|
||
}
|
||
else
|
||
{
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, shortname, BSF_INDIRECT,
|
||
bfd_ind_section_ptr, (bfd_vma) 0, name, false,
|
||
collect, (struct bfd_link_hash_entry **) &hi)))
|
||
goto error_return;
|
||
|
||
/* If there is a duplicate definition somewhere,
|
||
then HI may not point to an indirect symbol.
|
||
We will have reported an error to the user in
|
||
that case. */
|
||
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
{
|
||
/* If the symbol became indirect, then we
|
||
assume that we have not seen a definition
|
||
before. */
|
||
BFD_ASSERT ((hi->elf_link_hash_flags
|
||
& (ELF_LINK_HASH_DEF_DYNAMIC
|
||
| ELF_LINK_HASH_DEF_REGULAR))
|
||
== 0);
|
||
|
||
/* Copy down any references that we may have
|
||
already seen to the symbol which just
|
||
became indirect. */
|
||
h->elf_link_hash_flags |=
|
||
(hi->elf_link_hash_flags
|
||
& (ELF_LINK_HASH_REF_DYNAMIC
|
||
| ELF_LINK_HASH_REF_REGULAR));
|
||
|
||
/* Copy over the global and procedure linkage
|
||
table offset entries. These may have been
|
||
already set up by a check_relocs routine. */
|
||
if (h->got.offset == (bfd_vma) -1)
|
||
{
|
||
h->got.offset = hi->got.offset;
|
||
hi->got.offset = (bfd_vma) -1;
|
||
}
|
||
BFD_ASSERT (hi->got.offset == (bfd_vma) -1);
|
||
|
||
if (h->plt.offset == (bfd_vma) -1)
|
||
{
|
||
h->plt.offset = hi->plt.offset;
|
||
hi->plt.offset = (bfd_vma) -1;
|
||
}
|
||
BFD_ASSERT (hi->got.offset == (bfd_vma) -1);
|
||
|
||
if (h->dynindx == -1)
|
||
{
|
||
h->dynindx = hi->dynindx;
|
||
h->dynstr_index = hi->dynstr_index;
|
||
hi->dynindx = -1;
|
||
hi->dynstr_index = 0;
|
||
}
|
||
BFD_ASSERT (hi->dynindx == -1);
|
||
|
||
/* FIXME: There may be other information to
|
||
copy over for particular targets. */
|
||
|
||
/* See if the new flags lead us to realize
|
||
that the symbol must be dynamic. */
|
||
if (! dynsym)
|
||
{
|
||
if (! dynamic)
|
||
{
|
||
if (info->shared
|
||
|| ((hi->elf_link_hash_flags
|
||
& ELF_LINK_HASH_REF_DYNAMIC)
|
||
!= 0))
|
||
dynsym = true;
|
||
}
|
||
else
|
||
{
|
||
if ((hi->elf_link_hash_flags
|
||
& ELF_LINK_HASH_REF_REGULAR) != 0)
|
||
dynsym = true;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (dynsym && h->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
goto error_return;
|
||
if (h->weakdef != NULL
|
||
&& ! new_weakdef
|
||
&& h->weakdef->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info,
|
||
h->weakdef))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Now set the weakdefs field correctly for all the weak defined
|
||
symbols we found. The only way to do this is to search all the
|
||
symbols. Since we only need the information for non functions in
|
||
dynamic objects, that's the only time we actually put anything on
|
||
the list WEAKS. We need this information so that if a regular
|
||
object refers to a symbol defined weakly in a dynamic object, the
|
||
real symbol in the dynamic object is also put in the dynamic
|
||
symbols; we also must arrange for both symbols to point to the
|
||
same memory location. We could handle the general case of symbol
|
||
aliasing, but a general symbol alias can only be generated in
|
||
assembler code, handling it correctly would be very time
|
||
consuming, and other ELF linkers don't handle general aliasing
|
||
either. */
|
||
while (weaks != NULL)
|
||
{
|
||
struct elf_link_hash_entry *hlook;
|
||
asection *slook;
|
||
bfd_vma vlook;
|
||
struct elf_link_hash_entry **hpp;
|
||
struct elf_link_hash_entry **hppend;
|
||
|
||
hlook = weaks;
|
||
weaks = hlook->weakdef;
|
||
hlook->weakdef = NULL;
|
||
|
||
BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
|
||
|| hlook->root.type == bfd_link_hash_defweak
|
||
|| hlook->root.type == bfd_link_hash_common
|
||
|| hlook->root.type == bfd_link_hash_indirect);
|
||
slook = hlook->root.u.def.section;
|
||
vlook = hlook->root.u.def.value;
|
||
|
||
hpp = elf_sym_hashes (abfd);
|
||
hppend = hpp + extsymcount;
|
||
for (; hpp < hppend; hpp++)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = *hpp;
|
||
if (h != NULL && h != hlook
|
||
&& h->root.type == bfd_link_hash_defined
|
||
&& h->root.u.def.section == slook
|
||
&& h->root.u.def.value == vlook)
|
||
{
|
||
hlook->weakdef = h;
|
||
|
||
/* If the weak definition is in the list of dynamic
|
||
symbols, make sure the real definition is put there
|
||
as well. */
|
||
if (hlook->dynindx != -1
|
||
&& h->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
goto error_return;
|
||
}
|
||
|
||
/* If the real definition is in the list of dynamic
|
||
symbols, make sure the weak definition is put there
|
||
as well. If we don't do this, then the dynamic
|
||
loader might not merge the entries for the real
|
||
definition and the weak definition. */
|
||
if (h->dynindx != -1
|
||
&& hlook->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
|
||
goto error_return;
|
||
}
|
||
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (buf != NULL)
|
||
{
|
||
free (buf);
|
||
buf = NULL;
|
||
}
|
||
|
||
if (extversym != NULL)
|
||
{
|
||
free (extversym);
|
||
extversym = NULL;
|
||
}
|
||
|
||
/* If this object is the same format as the output object, and it is
|
||
not a shared library, then let the backend look through the
|
||
relocs.
|
||
|
||
This is required to build global offset table entries and to
|
||
arrange for dynamic relocs. It is not required for the
|
||
particular common case of linking non PIC code, even when linking
|
||
against shared libraries, but unfortunately there is no way of
|
||
knowing whether an object file has been compiled PIC or not.
|
||
Looking through the relocs is not particularly time consuming.
|
||
The problem is that we must either (1) keep the relocs in memory,
|
||
which causes the linker to require additional runtime memory or
|
||
(2) read the relocs twice from the input file, which wastes time.
|
||
This would be a good case for using mmap.
|
||
|
||
I have no idea how to handle linking PIC code into a file of a
|
||
different format. It probably can't be done. */
|
||
check_relocs = get_elf_backend_data (abfd)->check_relocs;
|
||
if (! dynamic
|
||
&& abfd->xvec == info->hash->creator
|
||
&& check_relocs != NULL)
|
||
{
|
||
asection *o;
|
||
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
boolean ok;
|
||
|
||
if ((o->flags & SEC_RELOC) == 0
|
||
|| o->reloc_count == 0
|
||
|| ((info->strip == strip_all || info->strip == strip_debugger)
|
||
&& (o->flags & SEC_DEBUGGING) != 0)
|
||
|| bfd_is_abs_section (o->output_section))
|
||
continue;
|
||
|
||
internal_relocs = (NAME(_bfd_elf,link_read_relocs)
|
||
(abfd, o, (PTR) NULL,
|
||
(Elf_Internal_Rela *) NULL,
|
||
info->keep_memory));
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
|
||
ok = (*check_relocs) (abfd, info, o, internal_relocs);
|
||
|
||
if (! info->keep_memory)
|
||
free (internal_relocs);
|
||
|
||
if (! ok)
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* If this is a non-traditional, non-relocateable link, try to
|
||
optimize the handling of the .stab/.stabstr sections. */
|
||
if (! dynamic
|
||
&& ! info->relocateable
|
||
&& ! info->traditional_format
|
||
&& info->hash->creator->flavour == bfd_target_elf_flavour
|
||
&& (info->strip != strip_all && info->strip != strip_debugger))
|
||
{
|
||
asection *stab, *stabstr;
|
||
|
||
stab = bfd_get_section_by_name (abfd, ".stab");
|
||
if (stab != NULL)
|
||
{
|
||
stabstr = bfd_get_section_by_name (abfd, ".stabstr");
|
||
|
||
if (stabstr != NULL)
|
||
{
|
||
struct bfd_elf_section_data *secdata;
|
||
|
||
secdata = elf_section_data (stab);
|
||
if (! _bfd_link_section_stabs (abfd,
|
||
&elf_hash_table (info)->stab_info,
|
||
stab, stabstr,
|
||
&secdata->stab_info))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (buf != NULL)
|
||
free (buf);
|
||
if (dynbuf != NULL)
|
||
free (dynbuf);
|
||
if (dynver != NULL)
|
||
free (dynver);
|
||
if (extversym != NULL)
|
||
free (extversym);
|
||
return false;
|
||
}
|
||
|
||
/* Create some sections which will be filled in with dynamic linking
|
||
information. ABFD is an input file which requires dynamic sections
|
||
to be created. The dynamic sections take up virtual memory space
|
||
when the final executable is run, so we need to create them before
|
||
addresses are assigned to the output sections. We work out the
|
||
actual contents and size of these sections later. */
|
||
|
||
boolean
|
||
elf_link_create_dynamic_sections (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
flagword flags;
|
||
register asection *s;
|
||
struct elf_link_hash_entry *h;
|
||
struct elf_backend_data *bed;
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
return true;
|
||
|
||
/* Make sure that all dynamic sections use the same input BFD. */
|
||
if (elf_hash_table (info)->dynobj == NULL)
|
||
elf_hash_table (info)->dynobj = abfd;
|
||
else
|
||
abfd = elf_hash_table (info)->dynobj;
|
||
|
||
/* Note that we set the SEC_IN_MEMORY flag for all of these
|
||
sections. */
|
||
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
|
||
|
||
/* A dynamically linked executable has a .interp section, but a
|
||
shared library does not. */
|
||
if (! info->shared)
|
||
{
|
||
s = bfd_make_section (abfd, ".interp");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
|
||
return false;
|
||
}
|
||
|
||
/* Create sections to hold version informations. These are removed
|
||
if they are not needed. */
|
||
s = bfd_make_section (abfd, ".gnu.version_d");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|
||
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
|
||
return false;
|
||
|
||
s = bfd_make_section (abfd, ".gnu.version");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|
||
|| ! bfd_set_section_alignment (abfd, s, 1))
|
||
return false;
|
||
|
||
s = bfd_make_section (abfd, ".gnu.version_r");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|
||
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
|
||
return false;
|
||
|
||
s = bfd_make_section (abfd, ".dynsym");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|
||
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
|
||
return false;
|
||
|
||
s = bfd_make_section (abfd, ".dynstr");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
|
||
return false;
|
||
|
||
/* Create a strtab to hold the dynamic symbol names. */
|
||
if (elf_hash_table (info)->dynstr == NULL)
|
||
{
|
||
elf_hash_table (info)->dynstr = elf_stringtab_init ();
|
||
if (elf_hash_table (info)->dynstr == NULL)
|
||
return false;
|
||
}
|
||
|
||
s = bfd_make_section (abfd, ".dynamic");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags)
|
||
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
|
||
return false;
|
||
|
||
/* The special symbol _DYNAMIC is always set to the start of the
|
||
.dynamic section. This call occurs before we have processed the
|
||
symbols for any dynamic object, so we don't have to worry about
|
||
overriding a dynamic definition. We could set _DYNAMIC in a
|
||
linker script, but we only want to define it if we are, in fact,
|
||
creating a .dynamic section. We don't want to define it if there
|
||
is no .dynamic section, since on some ELF platforms the start up
|
||
code examines it to decide how to initialize the process. */
|
||
h = NULL;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
|
||
(const char *) NULL, false, get_elf_backend_data (abfd)->collect,
|
||
(struct bfd_link_hash_entry **) &h)))
|
||
return false;
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
|
||
h->type = STT_OBJECT;
|
||
|
||
if (info->shared
|
||
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
|
||
s = bfd_make_section (abfd, ".hash");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|
||
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
|
||
return false;
|
||
|
||
/* Let the backend create the rest of the sections. This lets the
|
||
backend set the right flags. The backend will normally create
|
||
the .got and .plt sections. */
|
||
bed = get_elf_backend_data (abfd);
|
||
if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
|
||
return false;
|
||
|
||
elf_hash_table (info)->dynamic_sections_created = true;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Add an entry to the .dynamic table. */
|
||
|
||
boolean
|
||
elf_add_dynamic_entry (info, tag, val)
|
||
struct bfd_link_info *info;
|
||
bfd_vma tag;
|
||
bfd_vma val;
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
bfd *dynobj;
|
||
asection *s;
|
||
size_t newsize;
|
||
bfd_byte *newcontents;
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
newsize = s->_raw_size + sizeof (Elf_External_Dyn);
|
||
newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
|
||
if (newcontents == NULL)
|
||
return false;
|
||
|
||
dyn.d_tag = tag;
|
||
dyn.d_un.d_val = val;
|
||
elf_swap_dyn_out (dynobj, &dyn,
|
||
(Elf_External_Dyn *) (newcontents + s->_raw_size));
|
||
|
||
s->_raw_size = newsize;
|
||
s->contents = newcontents;
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
/* Read and swap the relocs for a section. They may have been cached.
|
||
If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
|
||
they are used as buffers to read into. They are known to be large
|
||
enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
|
||
value is allocated using either malloc or bfd_alloc, according to
|
||
the KEEP_MEMORY argument. */
|
||
|
||
Elf_Internal_Rela *
|
||
NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
|
||
keep_memory)
|
||
bfd *abfd;
|
||
asection *o;
|
||
PTR external_relocs;
|
||
Elf_Internal_Rela *internal_relocs;
|
||
boolean keep_memory;
|
||
{
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
PTR alloc1 = NULL;
|
||
Elf_Internal_Rela *alloc2 = NULL;
|
||
|
||
if (elf_section_data (o)->relocs != NULL)
|
||
return elf_section_data (o)->relocs;
|
||
|
||
if (o->reloc_count == 0)
|
||
return NULL;
|
||
|
||
rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
|
||
if (internal_relocs == NULL)
|
||
{
|
||
size_t size;
|
||
|
||
size = o->reloc_count * sizeof (Elf_Internal_Rela);
|
||
if (keep_memory)
|
||
internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
|
||
else
|
||
internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (external_relocs == NULL)
|
||
{
|
||
alloc1 = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size);
|
||
if (alloc1 == NULL)
|
||
goto error_return;
|
||
external_relocs = alloc1;
|
||
}
|
||
|
||
if ((bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0)
|
||
|| (bfd_read (external_relocs, 1, rel_hdr->sh_size, abfd)
|
||
!= rel_hdr->sh_size))
|
||
goto error_return;
|
||
|
||
/* Swap in the relocs. For convenience, we always produce an
|
||
Elf_Internal_Rela array; if the relocs are Rel, we set the addend
|
||
to 0. */
|
||
if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
|
||
{
|
||
Elf_External_Rel *erel;
|
||
Elf_External_Rel *erelend;
|
||
Elf_Internal_Rela *irela;
|
||
|
||
erel = (Elf_External_Rel *) external_relocs;
|
||
erelend = erel + o->reloc_count;
|
||
irela = internal_relocs;
|
||
for (; erel < erelend; erel++, irela++)
|
||
{
|
||
Elf_Internal_Rel irel;
|
||
|
||
elf_swap_reloc_in (abfd, erel, &irel);
|
||
irela->r_offset = irel.r_offset;
|
||
irela->r_info = irel.r_info;
|
||
irela->r_addend = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
Elf_External_Rela *erela;
|
||
Elf_External_Rela *erelaend;
|
||
Elf_Internal_Rela *irela;
|
||
|
||
BFD_ASSERT (rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
|
||
|
||
erela = (Elf_External_Rela *) external_relocs;
|
||
erelaend = erela + o->reloc_count;
|
||
irela = internal_relocs;
|
||
for (; erela < erelaend; erela++, irela++)
|
||
elf_swap_reloca_in (abfd, erela, irela);
|
||
}
|
||
|
||
/* Cache the results for next time, if we can. */
|
||
if (keep_memory)
|
||
elf_section_data (o)->relocs = internal_relocs;
|
||
|
||
if (alloc1 != NULL)
|
||
free (alloc1);
|
||
|
||
/* Don't free alloc2, since if it was allocated we are passing it
|
||
back (under the name of internal_relocs). */
|
||
|
||
return internal_relocs;
|
||
|
||
error_return:
|
||
if (alloc1 != NULL)
|
||
free (alloc1);
|
||
if (alloc2 != NULL)
|
||
free (alloc2);
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/* Record an assignment to a symbol made by a linker script. We need
|
||
this in case some dynamic object refers to this symbol. */
|
||
|
||
/*ARGSUSED*/
|
||
boolean
|
||
NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
|
||
bfd *output_bfd;
|
||
struct bfd_link_info *info;
|
||
const char *name;
|
||
boolean provide;
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
if (info->hash->creator->flavour != bfd_target_elf_flavour)
|
||
return true;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
|
||
if (h == NULL)
|
||
return false;
|
||
|
||
if (h->root.type == bfd_link_hash_new)
|
||
h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
|
||
|
||
/* If this symbol is being provided by the linker script, and it is
|
||
currently defined by a dynamic object, but not by a regular
|
||
object, then mark it as undefined so that the generic linker will
|
||
force the correct value. */
|
||
if (provide
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
h->root.type = bfd_link_hash_undefined;
|
||
|
||
/* If this symbol is not being provided by the linker script, and it is
|
||
currently defined by a dynamic object, but not by a regular object,
|
||
then clear out any version information because the symbol will not be
|
||
associated with the dynamic object any more. */
|
||
if (!provide
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
h->verinfo.verdef = NULL;
|
||
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
|
||
h->type = STT_OBJECT;
|
||
|
||
if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
|
||
| ELF_LINK_HASH_REF_DYNAMIC)) != 0
|
||
|| info->shared)
|
||
&& h->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
|
||
/* If this is a weak defined symbol, and we know a corresponding
|
||
real symbol from the same dynamic object, make sure the real
|
||
symbol is also made into a dynamic symbol. */
|
||
if (h->weakdef != NULL
|
||
&& h->weakdef->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* This structure is used to pass information to
|
||
elf_link_assign_sym_version. */
|
||
|
||
struct elf_assign_sym_version_info
|
||
{
|
||
/* Output BFD. */
|
||
bfd *output_bfd;
|
||
/* General link information. */
|
||
struct bfd_link_info *info;
|
||
/* Version tree. */
|
||
struct bfd_elf_version_tree *verdefs;
|
||
/* Whether we are exporting all dynamic symbols. */
|
||
boolean export_dynamic;
|
||
/* Whether we removed any symbols from the dynamic symbol table. */
|
||
boolean removed_dynamic;
|
||
/* Whether we had a failure. */
|
||
boolean failed;
|
||
};
|
||
|
||
/* This structure is used to pass information to
|
||
elf_link_find_version_dependencies. */
|
||
|
||
struct elf_find_verdep_info
|
||
{
|
||
/* Output BFD. */
|
||
bfd *output_bfd;
|
||
/* General link information. */
|
||
struct bfd_link_info *info;
|
||
/* The number of dependencies. */
|
||
unsigned int vers;
|
||
/* Whether we had a failure. */
|
||
boolean failed;
|
||
};
|
||
|
||
/* Array used to determine the number of hash table buckets to use
|
||
based on the number of symbols there are. If there are fewer than
|
||
3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
|
||
fewer than 37 we use 17 buckets, and so forth. We never use more
|
||
than 32771 buckets. */
|
||
|
||
static const size_t elf_buckets[] =
|
||
{
|
||
1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
|
||
16411, 32771, 0
|
||
};
|
||
|
||
/* Compute bucket count for hashing table. We do not use a static set
|
||
of possible tables sizes anymore. Instead we determine for all
|
||
possible reasonable sizes of the table the outcome (i.e., the
|
||
number of collisions etc) and choose the best solution. The
|
||
weighting functions are not too simple to allow the table to grow
|
||
without bounds. Instead one of the weighting factors is the size.
|
||
Therefore the result is always a good payoff between few collisions
|
||
(= short chain lengths) and table size. */
|
||
static size_t
|
||
compute_bucket_count (info)
|
||
struct bfd_link_info *info;
|
||
{
|
||
size_t dynsymcount = elf_hash_table (info)->dynsymcount;
|
||
size_t best_size;
|
||
unsigned long int *hashcodes;
|
||
unsigned long int *hashcodesp;
|
||
unsigned long int i;
|
||
|
||
/* Compute the hash values for all exported symbols. At the same
|
||
time store the values in an array so that we could use them for
|
||
optimizations. */
|
||
hashcodes = (unsigned long int *) bfd_malloc (dynsymcount
|
||
* sizeof (unsigned long int));
|
||
if (hashcodes == NULL)
|
||
return 0;
|
||
hashcodesp = hashcodes;
|
||
|
||
/* Put all hash values in HASHCODES. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_collect_hash_codes, &hashcodesp);
|
||
|
||
/* We have a problem here. The following code to optimize the table size
|
||
requires an integer type with more the 32 bits. If BFD_HOST_U_64_BIT
|
||
is set or GCC 2 is used we know about such a type. */
|
||
#if defined BFD_HOST_U_64_BIT || __GNUC__ >= 2
|
||
# ifndef BFD_HOST_U_64_BIT
|
||
# define BFD_HOST_U_64_BIT unsigned long long int
|
||
# endif
|
||
if (info->optimize == true)
|
||
{
|
||
unsigned long int nsyms = hashcodesp - hashcodes;
|
||
size_t minsize;
|
||
size_t maxsize;
|
||
BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
|
||
unsigned long int *counts ;
|
||
|
||
/* Possible optimization parameters: if we have NSYMS symbols we say
|
||
that the hashing table must at least have NSYMS/4 and at most
|
||
2*NSYMS buckets. */
|
||
minsize = nsyms / 4;
|
||
best_size = maxsize = nsyms * 2;
|
||
|
||
/* Create array where we count the collisions in. We must use bfd_malloc
|
||
since the size could be large. */
|
||
counts = (unsigned long int *) bfd_malloc (maxsize
|
||
* sizeof (unsigned long int));
|
||
if (counts == NULL)
|
||
{
|
||
free (hashcodes);
|
||
return 0;
|
||
}
|
||
|
||
/* Compute the "optimal" size for the hash table. The criteria is a
|
||
minimal chain length. The minor criteria is (of course) the size
|
||
of the table. */
|
||
for (i = minsize; i < maxsize; ++i)
|
||
{
|
||
/* Walk through the array of hashcodes and count the collisions. */
|
||
BFD_HOST_U_64_BIT max;
|
||
unsigned long int j;
|
||
unsigned long int fact;
|
||
|
||
memset (counts, '\0', i * sizeof (unsigned long int));
|
||
|
||
/* Determine how often each hash bucket is used. */
|
||
for (j = 0; j < nsyms; ++j)
|
||
++counts[hashcodes[j] % i];
|
||
|
||
/* For the weight function we need some information about the
|
||
pagesize on the target. This is information need not be 100%
|
||
accurate. Since this information is not available (so far) we
|
||
define it here to a reasonable default value. If it is crucial
|
||
to have a better value some day simply define this value. */
|
||
# ifndef BFD_TARGET_PAGESIZE
|
||
# define BFD_TARGET_PAGESIZE (4096)
|
||
# endif
|
||
|
||
/* We in any case need 2 + NSYMS entries for the size values and
|
||
the chains. */
|
||
max = (2 + nsyms) * (ARCH_SIZE / 8);
|
||
|
||
# if 1
|
||
/* Variant 1: optimize for short chains. We add the squares
|
||
of all the chain lengths (which favous many small chain
|
||
over a few long chains). */
|
||
for (j = 0; j < i; ++j)
|
||
max += counts[j] * counts[j];
|
||
|
||
/* This adds penalties for the overall size of the table. */
|
||
fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
|
||
max *= fact * fact;
|
||
# else
|
||
/* Variant 2: Optimize a lot more for small table. Here we
|
||
also add squares of the size but we also add penalties for
|
||
empty slots (the +1 term). */
|
||
for (j = 0; j < i; ++j)
|
||
max += (1 + counts[j]) * (1 + counts[j]);
|
||
|
||
/* The overall size of the table is considered, but not as
|
||
strong as in variant 1, where it is squared. */
|
||
fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
|
||
max *= fact;
|
||
# endif
|
||
|
||
/* Compare with current best results. */
|
||
if (max < best_chlen)
|
||
{
|
||
best_chlen = max;
|
||
best_size = i;
|
||
}
|
||
}
|
||
|
||
free (counts);
|
||
}
|
||
else
|
||
#endif
|
||
{
|
||
/* This is the fallback solution if no 64bit type is available or if we
|
||
are not supposed to spend much time on optimizations. We select the
|
||
bucket count using a fixed set of numbers. */
|
||
for (i = 0; elf_buckets[i] != 0; i++)
|
||
{
|
||
best_size = elf_buckets[i];
|
||
if (dynsymcount < elf_buckets[i + 1])
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Free the arrays we needed. */
|
||
free (hashcodes);
|
||
|
||
return best_size;
|
||
}
|
||
|
||
/* Set up the sizes and contents of the ELF dynamic sections. This is
|
||
called by the ELF linker emulation before_allocation routine. We
|
||
must set the sizes of the sections before the linker sets the
|
||
addresses of the various sections. */
|
||
|
||
boolean
|
||
NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
|
||
export_dynamic, filter_shlib,
|
||
auxiliary_filters, info, sinterpptr,
|
||
verdefs)
|
||
bfd *output_bfd;
|
||
const char *soname;
|
||
const char *rpath;
|
||
boolean export_dynamic;
|
||
const char *filter_shlib;
|
||
const char * const *auxiliary_filters;
|
||
struct bfd_link_info *info;
|
||
asection **sinterpptr;
|
||
struct bfd_elf_version_tree *verdefs;
|
||
{
|
||
bfd_size_type soname_indx;
|
||
bfd *dynobj;
|
||
struct elf_backend_data *bed;
|
||
bfd_size_type old_dynsymcount;
|
||
struct elf_assign_sym_version_info asvinfo;
|
||
|
||
*sinterpptr = NULL;
|
||
|
||
soname_indx = (bfd_size_type) -1;
|
||
|
||
if (info->hash->creator->flavour != bfd_target_elf_flavour)
|
||
return true;
|
||
|
||
/* The backend may have to create some sections regardless of whether
|
||
we're dynamic or not. */
|
||
bed = get_elf_backend_data (output_bfd);
|
||
if (bed->elf_backend_always_size_sections
|
||
&& ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
|
||
return false;
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
/* If there were no dynamic objects in the link, there is nothing to
|
||
do here. */
|
||
if (dynobj == NULL)
|
||
return true;
|
||
|
||
/* If we are supposed to export all symbols into the dynamic symbol
|
||
table (this is not the normal case), then do so. */
|
||
if (export_dynamic)
|
||
{
|
||
struct elf_info_failed eif;
|
||
|
||
eif.failed = false;
|
||
eif.info = info;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
|
||
(PTR) &eif);
|
||
if (eif.failed)
|
||
return false;
|
||
}
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
struct elf_info_failed eif;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_size_type strsize;
|
||
|
||
*sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
|
||
BFD_ASSERT (*sinterpptr != NULL || info->shared);
|
||
|
||
if (soname != NULL)
|
||
{
|
||
soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
soname, true, true);
|
||
if (soname_indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
|
||
return false;
|
||
}
|
||
|
||
if (info->symbolic)
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
|
||
return false;
|
||
}
|
||
|
||
if (rpath != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
|
||
true, true);
|
||
if (indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_RPATH, indx))
|
||
return false;
|
||
}
|
||
|
||
if (filter_shlib != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
filter_shlib, true, true);
|
||
if (indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_FILTER, indx))
|
||
return false;
|
||
}
|
||
|
||
if (auxiliary_filters != NULL)
|
||
{
|
||
const char * const *p;
|
||
|
||
for (p = auxiliary_filters; *p != NULL; p++)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
*p, true, true);
|
||
if (indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/* Attach all the symbols to their version information. */
|
||
asvinfo.output_bfd = output_bfd;
|
||
asvinfo.info = info;
|
||
asvinfo.verdefs = verdefs;
|
||
asvinfo.export_dynamic = export_dynamic;
|
||
asvinfo.removed_dynamic = false;
|
||
asvinfo.failed = false;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_link_assign_sym_version,
|
||
(PTR) &asvinfo);
|
||
if (asvinfo.failed)
|
||
return false;
|
||
|
||
/* Find all symbols which were defined in a dynamic object and make
|
||
the backend pick a reasonable value for them. */
|
||
eif.failed = false;
|
||
eif.info = info;
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_adjust_dynamic_symbol,
|
||
(PTR) &eif);
|
||
if (eif.failed)
|
||
return false;
|
||
|
||
/* Add some entries to the .dynamic section. We fill in some of the
|
||
values later, in elf_bfd_final_link, but we must add the entries
|
||
now so that we know the final size of the .dynamic section. */
|
||
h = elf_link_hash_lookup (elf_hash_table (info), "_init", false,
|
||
false, false);
|
||
if (h != NULL
|
||
&& (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
|
||
| ELF_LINK_HASH_DEF_REGULAR)) != 0)
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_INIT, 0))
|
||
return false;
|
||
}
|
||
h = elf_link_hash_lookup (elf_hash_table (info), "_fini", false,
|
||
false, false);
|
||
if (h != NULL
|
||
&& (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
|
||
| ELF_LINK_HASH_DEF_REGULAR)) != 0)
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_FINI, 0))
|
||
return false;
|
||
}
|
||
strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
|
||
if (! elf_add_dynamic_entry (info, DT_HASH, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
|
||
|| ! elf_add_dynamic_entry (info, DT_SYMENT,
|
||
sizeof (Elf_External_Sym)))
|
||
return false;
|
||
}
|
||
|
||
/* The backend must work out the sizes of all the other dynamic
|
||
sections. */
|
||
old_dynsymcount = elf_hash_table (info)->dynsymcount;
|
||
if (bed->elf_backend_size_dynamic_sections
|
||
&& ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
|
||
return false;
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
size_t dynsymcount;
|
||
asection *s;
|
||
size_t i;
|
||
size_t bucketcount = 0;
|
||
Elf_Internal_Sym isym;
|
||
|
||
/* Set up the version definition section. */
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
/* We may have created additional version definitions if we are
|
||
just linking a regular application. */
|
||
verdefs = asvinfo.verdefs;
|
||
|
||
if (verdefs == NULL)
|
||
{
|
||
asection **spp;
|
||
|
||
/* Don't include this section in the output file. */
|
||
for (spp = &output_bfd->sections;
|
||
*spp != s->output_section;
|
||
spp = &(*spp)->next)
|
||
;
|
||
*spp = s->output_section->next;
|
||
--output_bfd->section_count;
|
||
}
|
||
else
|
||
{
|
||
unsigned int cdefs;
|
||
bfd_size_type size;
|
||
struct bfd_elf_version_tree *t;
|
||
bfd_byte *p;
|
||
Elf_Internal_Verdef def;
|
||
Elf_Internal_Verdaux defaux;
|
||
|
||
if (asvinfo.removed_dynamic)
|
||
{
|
||
/* Some dynamic symbols were changed to be local
|
||
symbols. In this case, we renumber all of the
|
||
dynamic symbols, so that we don't have a hole. If
|
||
the backend changed dynsymcount, then assume that the
|
||
new symbols are at the start. This is the case on
|
||
the MIPS. FIXME: The names of the removed symbols
|
||
will still be in the dynamic string table, wasting
|
||
space. */
|
||
elf_hash_table (info)->dynsymcount =
|
||
1 + (elf_hash_table (info)->dynsymcount - old_dynsymcount);
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_link_renumber_dynsyms,
|
||
(PTR) info);
|
||
}
|
||
|
||
cdefs = 0;
|
||
size = 0;
|
||
|
||
/* Make space for the base version. */
|
||
size += sizeof (Elf_External_Verdef);
|
||
size += sizeof (Elf_External_Verdaux);
|
||
++cdefs;
|
||
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
{
|
||
struct bfd_elf_version_deps *n;
|
||
|
||
size += sizeof (Elf_External_Verdef);
|
||
size += sizeof (Elf_External_Verdaux);
|
||
++cdefs;
|
||
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
size += sizeof (Elf_External_Verdaux);
|
||
}
|
||
|
||
s->_raw_size = size;
|
||
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL && s->_raw_size != 0)
|
||
return false;
|
||
|
||
/* Fill in the version definition section. */
|
||
|
||
p = s->contents;
|
||
|
||
def.vd_version = VER_DEF_CURRENT;
|
||
def.vd_flags = VER_FLG_BASE;
|
||
def.vd_ndx = 1;
|
||
def.vd_cnt = 1;
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ sizeof (Elf_External_Verdaux));
|
||
|
||
if (soname_indx != (bfd_size_type) -1)
|
||
{
|
||
def.vd_hash = bfd_elf_hash ((const unsigned char *) soname);
|
||
defaux.vda_name = soname_indx;
|
||
}
|
||
else
|
||
{
|
||
const char *name;
|
||
bfd_size_type indx;
|
||
|
||
name = output_bfd->filename;
|
||
def.vd_hash = bfd_elf_hash ((const unsigned char *) name);
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
name, true, false);
|
||
if (indx == (bfd_size_type) -1)
|
||
return false;
|
||
defaux.vda_name = indx;
|
||
}
|
||
defaux.vda_next = 0;
|
||
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *)p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
{
|
||
unsigned int cdeps;
|
||
struct bfd_elf_version_deps *n;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
cdeps = 0;
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
++cdeps;
|
||
|
||
/* Add a symbol representing this version. */
|
||
h = NULL;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
|
||
(bfd_vma) 0, (const char *) NULL, false,
|
||
get_elf_backend_data (dynobj)->collect,
|
||
(struct bfd_link_hash_entry **) &h)))
|
||
return false;
|
||
h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
|
||
h->type = STT_OBJECT;
|
||
h->verinfo.vertree = t;
|
||
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
|
||
def.vd_version = VER_DEF_CURRENT;
|
||
def.vd_flags = 0;
|
||
if (t->globals == NULL && t->locals == NULL && ! t->used)
|
||
def.vd_flags |= VER_FLG_WEAK;
|
||
def.vd_ndx = t->vernum + 1;
|
||
def.vd_cnt = cdeps + 1;
|
||
def.vd_hash = bfd_elf_hash ((const unsigned char *) t->name);
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
if (t->next != NULL)
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ (cdeps + 1) * sizeof (Elf_External_Verdaux));
|
||
else
|
||
def.vd_next = 0;
|
||
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *) p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
|
||
defaux.vda_name = h->dynstr_index;
|
||
if (t->deps == NULL)
|
||
defaux.vda_next = 0;
|
||
else
|
||
defaux.vda_next = sizeof (Elf_External_Verdaux);
|
||
t->name_indx = defaux.vda_name;
|
||
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
{
|
||
if (n->version_needed == NULL)
|
||
{
|
||
/* This can happen if there was an error in the
|
||
version script. */
|
||
defaux.vda_name = 0;
|
||
}
|
||
else
|
||
defaux.vda_name = n->version_needed->name_indx;
|
||
if (n->next == NULL)
|
||
defaux.vda_next = 0;
|
||
else
|
||
defaux.vda_next = sizeof (Elf_External_Verdaux);
|
||
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
|
||
return false;
|
||
|
||
elf_tdata (output_bfd)->cverdefs = cdefs;
|
||
}
|
||
|
||
/* Work out the size of the version reference section. */
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
|
||
BFD_ASSERT (s != NULL);
|
||
{
|
||
struct elf_find_verdep_info sinfo;
|
||
|
||
sinfo.output_bfd = output_bfd;
|
||
sinfo.info = info;
|
||
sinfo.vers = elf_tdata (output_bfd)->cverdefs;
|
||
if (sinfo.vers == 0)
|
||
sinfo.vers = 1;
|
||
sinfo.failed = false;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_link_find_version_dependencies,
|
||
(PTR) &sinfo);
|
||
|
||
if (elf_tdata (output_bfd)->verref == NULL)
|
||
{
|
||
asection **spp;
|
||
|
||
/* We don't have any version definitions, so we can just
|
||
remove the section. */
|
||
|
||
for (spp = &output_bfd->sections;
|
||
*spp != s->output_section;
|
||
spp = &(*spp)->next)
|
||
;
|
||
*spp = s->output_section->next;
|
||
--output_bfd->section_count;
|
||
}
|
||
else
|
||
{
|
||
Elf_Internal_Verneed *t;
|
||
unsigned int size;
|
||
unsigned int crefs;
|
||
bfd_byte *p;
|
||
|
||
/* Build the version definition section. */
|
||
size = 0;
|
||
crefs = 0;
|
||
for (t = elf_tdata (output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
size += sizeof (Elf_External_Verneed);
|
||
++crefs;
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
size += sizeof (Elf_External_Vernaux);
|
||
}
|
||
|
||
s->_raw_size = size;
|
||
s->contents = (bfd_byte *) bfd_alloc (output_bfd, size);
|
||
if (s->contents == NULL)
|
||
return false;
|
||
|
||
p = s->contents;
|
||
for (t = elf_tdata (output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
unsigned int caux;
|
||
Elf_Internal_Vernaux *a;
|
||
bfd_size_type indx;
|
||
|
||
caux = 0;
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
++caux;
|
||
|
||
t->vn_version = VER_NEED_CURRENT;
|
||
t->vn_cnt = caux;
|
||
if (elf_dt_name (t->vn_bfd) != NULL)
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
elf_dt_name (t->vn_bfd),
|
||
true, false);
|
||
else
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
t->vn_bfd->filename, true, false);
|
||
if (indx == (bfd_size_type) -1)
|
||
return false;
|
||
t->vn_file = indx;
|
||
t->vn_aux = sizeof (Elf_External_Verneed);
|
||
if (t->vn_nextref == NULL)
|
||
t->vn_next = 0;
|
||
else
|
||
t->vn_next = (sizeof (Elf_External_Verneed)
|
||
+ caux * sizeof (Elf_External_Vernaux));
|
||
|
||
_bfd_elf_swap_verneed_out (output_bfd, t,
|
||
(Elf_External_Verneed *) p);
|
||
p += sizeof (Elf_External_Verneed);
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
{
|
||
a->vna_hash = bfd_elf_hash ((const unsigned char *)
|
||
a->vna_nodename);
|
||
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
|
||
a->vna_nodename, true, false);
|
||
if (indx == (bfd_size_type) -1)
|
||
return false;
|
||
a->vna_name = indx;
|
||
if (a->vna_nextptr == NULL)
|
||
a->vna_next = 0;
|
||
else
|
||
a->vna_next = sizeof (Elf_External_Vernaux);
|
||
|
||
_bfd_elf_swap_vernaux_out (output_bfd, a,
|
||
(Elf_External_Vernaux *) p);
|
||
p += sizeof (Elf_External_Vernaux);
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
|
||
return false;
|
||
|
||
elf_tdata (output_bfd)->cverrefs = crefs;
|
||
}
|
||
}
|
||
|
||
dynsymcount = elf_hash_table (info)->dynsymcount;
|
||
|
||
/* Work out the size of the symbol version section. */
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version");
|
||
BFD_ASSERT (s != NULL);
|
||
if (dynsymcount == 0
|
||
|| (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
|
||
{
|
||
asection **spp;
|
||
|
||
/* We don't need any symbol versions; just discard the
|
||
section. */
|
||
for (spp = &output_bfd->sections;
|
||
*spp != s->output_section;
|
||
spp = &(*spp)->next)
|
||
;
|
||
*spp = s->output_section->next;
|
||
--output_bfd->section_count;
|
||
}
|
||
else
|
||
{
|
||
s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
|
||
s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL)
|
||
return false;
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
|
||
return false;
|
||
}
|
||
|
||
/* Set the size of the .dynsym and .hash sections. We counted
|
||
the number of dynamic symbols in elf_link_add_object_symbols.
|
||
We will build the contents of .dynsym and .hash when we build
|
||
the final symbol table, because until then we do not know the
|
||
correct value to give the symbols. We built the .dynstr
|
||
section as we went along in elf_link_add_object_symbols. */
|
||
s = bfd_get_section_by_name (dynobj, ".dynsym");
|
||
BFD_ASSERT (s != NULL);
|
||
s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
|
||
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL && s->_raw_size != 0)
|
||
return false;
|
||
|
||
/* The first entry in .dynsym is a dummy symbol. */
|
||
isym.st_value = 0;
|
||
isym.st_size = 0;
|
||
isym.st_name = 0;
|
||
isym.st_info = 0;
|
||
isym.st_other = 0;
|
||
isym.st_shndx = 0;
|
||
elf_swap_symbol_out (output_bfd, &isym,
|
||
(PTR) (Elf_External_Sym *) s->contents);
|
||
|
||
/* Compute the size of the hashing table. As a side effect this
|
||
computes the hash values for all the names we export. */
|
||
bucketcount = compute_bucket_count (info);
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".hash");
|
||
BFD_ASSERT (s != NULL);
|
||
s->_raw_size = (2 + bucketcount + dynsymcount) * (ARCH_SIZE / 8);
|
||
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL)
|
||
return false;
|
||
memset (s->contents, 0, (size_t) s->_raw_size);
|
||
|
||
put_word (output_bfd, bucketcount, s->contents);
|
||
put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8));
|
||
|
||
elf_hash_table (info)->bucketcount = bucketcount;
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".dynstr");
|
||
BFD_ASSERT (s != NULL);
|
||
s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_NULL, 0))
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Fix up the flags for a symbol. This handles various cases which
|
||
can only be fixed after all the input files are seen. This is
|
||
currently called by both adjust_dynamic_symbol and
|
||
assign_sym_version, which is unnecessary but perhaps more robust in
|
||
the face of future changes. */
|
||
|
||
static boolean
|
||
elf_fix_symbol_flags (h, eif)
|
||
struct elf_link_hash_entry *h;
|
||
struct elf_info_failed *eif;
|
||
{
|
||
/* If this symbol was mentioned in a non-ELF file, try to set
|
||
DEF_REGULAR and REF_REGULAR correctly. This is the only way to
|
||
permit a non-ELF file to correctly refer to a symbol defined in
|
||
an ELF dynamic object. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
|
||
{
|
||
if (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
|
||
else
|
||
{
|
||
if (h->root.u.def.section->owner != NULL
|
||
&& (bfd_get_flavour (h->root.u.def.section->owner)
|
||
== bfd_target_elf_flavour))
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
|
||
else
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
|
||
}
|
||
|
||
if (h->dynindx == -1
|
||
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
|| (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
|
||
{
|
||
eif->failed = true;
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If this is a final link, and the symbol was defined as a common
|
||
symbol in a regular object file, and there was no definition in
|
||
any dynamic object, then the linker will have allocated space for
|
||
the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
|
||
flag will not have been set. */
|
||
if (h->root.type == bfd_link_hash_defined
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
|
||
&& (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
|
||
|
||
/* If -Bsymbolic was used (which means to bind references to global
|
||
symbols to the definition within the shared object), and this
|
||
symbol was defined in a regular object, then it actually doesn't
|
||
need a PLT entry. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
|
||
&& eif->info->shared
|
||
&& eif->info->symbolic
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
|
||
{
|
||
h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
|
||
h->plt.offset = (bfd_vma) -1;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Make the backend pick a good value for a dynamic symbol. This is
|
||
called via elf_link_hash_traverse, and also calls itself
|
||
recursively. */
|
||
|
||
static boolean
|
||
elf_adjust_dynamic_symbol (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
struct elf_info_failed *eif = (struct elf_info_failed *) data;
|
||
bfd *dynobj;
|
||
struct elf_backend_data *bed;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return true;
|
||
|
||
/* Fix the symbol flags. */
|
||
if (! elf_fix_symbol_flags (h, eif))
|
||
return false;
|
||
|
||
/* If this symbol does not require a PLT entry, and it is not
|
||
defined by a dynamic object, or is not referenced by a regular
|
||
object, ignore it. We do have to handle a weak defined symbol,
|
||
even if no regular object refers to it, if we decided to add it
|
||
to the dynamic symbol table. FIXME: Do we normally need to worry
|
||
about symbols which are defined by one dynamic object and
|
||
referenced by another one? */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
|
||
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
|
||
|| (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
|
||
|| ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
|
||
&& (h->weakdef == NULL || h->weakdef->dynindx == -1))))
|
||
{
|
||
h->plt.offset = (bfd_vma) -1;
|
||
return true;
|
||
}
|
||
|
||
/* If we've already adjusted this symbol, don't do it again. This
|
||
can happen via a recursive call. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
|
||
return true;
|
||
|
||
/* Don't look at this symbol again. Note that we must set this
|
||
after checking the above conditions, because we may look at a
|
||
symbol once, decide not to do anything, and then get called
|
||
recursively later after REF_REGULAR is set below. */
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
|
||
|
||
/* If this is a weak definition, and we know a real definition, and
|
||
the real symbol is not itself defined by a regular object file,
|
||
then get a good value for the real definition. We handle the
|
||
real symbol first, for the convenience of the backend routine.
|
||
|
||
Note that there is a confusing case here. If the real definition
|
||
is defined by a regular object file, we don't get the real symbol
|
||
from the dynamic object, but we do get the weak symbol. If the
|
||
processor backend uses a COPY reloc, then if some routine in the
|
||
dynamic object changes the real symbol, we will not see that
|
||
change in the corresponding weak symbol. This is the way other
|
||
ELF linkers work as well, and seems to be a result of the shared
|
||
library model.
|
||
|
||
I will clarify this issue. Most SVR4 shared libraries define the
|
||
variable _timezone and define timezone as a weak synonym. The
|
||
tzset call changes _timezone. If you write
|
||
extern int timezone;
|
||
int _timezone = 5;
|
||
int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
|
||
you might expect that, since timezone is a synonym for _timezone,
|
||
the same number will print both times. However, if the processor
|
||
backend uses a COPY reloc, then actually timezone will be copied
|
||
into your process image, and, since you define _timezone
|
||
yourself, _timezone will not. Thus timezone and _timezone will
|
||
wind up at different memory locations. The tzset call will set
|
||
_timezone, leaving timezone unchanged. */
|
||
|
||
if (h->weakdef != NULL)
|
||
{
|
||
struct elf_link_hash_entry *weakdef;
|
||
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak);
|
||
weakdef = h->weakdef;
|
||
BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
|
||
|| weakdef->root.type == bfd_link_hash_defweak);
|
||
BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
|
||
if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
|
||
{
|
||
/* This symbol is defined by a regular object file, so we
|
||
will not do anything special. Clear weakdef for the
|
||
convenience of the processor backend. */
|
||
h->weakdef = NULL;
|
||
}
|
||
else
|
||
{
|
||
/* There is an implicit reference by a regular object file
|
||
via the weak symbol. */
|
||
weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
|
||
if (! elf_adjust_dynamic_symbol (weakdef, (PTR) eif))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
dynobj = elf_hash_table (eif->info)->dynobj;
|
||
bed = get_elf_backend_data (dynobj);
|
||
if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
|
||
{
|
||
eif->failed = true;
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* This routine is used to export all defined symbols into the dynamic
|
||
symbol table. It is called via elf_link_hash_traverse. */
|
||
|
||
static boolean
|
||
elf_export_symbol (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
struct elf_info_failed *eif = (struct elf_info_failed *) data;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return true;
|
||
|
||
if (h->dynindx == -1
|
||
&& (h->elf_link_hash_flags
|
||
& (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
|
||
{
|
||
eif->failed = true;
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Look through the symbols which are defined in other shared
|
||
libraries and referenced here. Update the list of version
|
||
dependencies. This will be put into the .gnu.version_r section.
|
||
This function is called via elf_link_hash_traverse. */
|
||
|
||
static boolean
|
||
elf_link_find_version_dependencies (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
|
||
Elf_Internal_Verneed *t;
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
/* We only care about symbols defined in shared objects with version
|
||
information. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
|
||
|| (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
|
||
|| h->dynindx == -1
|
||
|| h->verinfo.verdef == NULL)
|
||
return true;
|
||
|
||
/* See if we already know about this version. */
|
||
for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
|
||
{
|
||
if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
|
||
continue;
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
|
||
return true;
|
||
|
||
break;
|
||
}
|
||
|
||
/* This is a new version. Add it to tree we are building. */
|
||
|
||
if (t == NULL)
|
||
{
|
||
t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t);
|
||
if (t == NULL)
|
||
{
|
||
rinfo->failed = true;
|
||
return false;
|
||
}
|
||
|
||
t->vn_bfd = h->verinfo.verdef->vd_bfd;
|
||
t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
|
||
elf_tdata (rinfo->output_bfd)->verref = t;
|
||
}
|
||
|
||
a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a);
|
||
|
||
/* Note that we are copying a string pointer here, and testing it
|
||
above. If bfd_elf_string_from_elf_section is ever changed to
|
||
discard the string data when low in memory, this will have to be
|
||
fixed. */
|
||
a->vna_nodename = h->verinfo.verdef->vd_nodename;
|
||
|
||
a->vna_flags = h->verinfo.verdef->vd_flags;
|
||
a->vna_nextptr = t->vn_auxptr;
|
||
|
||
h->verinfo.verdef->vd_exp_refno = rinfo->vers;
|
||
++rinfo->vers;
|
||
|
||
a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
|
||
|
||
t->vn_auxptr = a;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Figure out appropriate versions for all the symbols. We may not
|
||
have the version number script until we have read all of the input
|
||
files, so until that point we don't know which symbols should be
|
||
local. This function is called via elf_link_hash_traverse. */
|
||
|
||
static boolean
|
||
elf_link_assign_sym_version (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
struct elf_assign_sym_version_info *sinfo =
|
||
(struct elf_assign_sym_version_info *) data;
|
||
struct bfd_link_info *info = sinfo->info;
|
||
struct elf_info_failed eif;
|
||
char *p;
|
||
|
||
/* Fix the symbol flags. */
|
||
eif.failed = false;
|
||
eif.info = info;
|
||
if (! elf_fix_symbol_flags (h, &eif))
|
||
{
|
||
if (eif.failed)
|
||
sinfo->failed = true;
|
||
return false;
|
||
}
|
||
|
||
/* We only need version numbers for symbols defined in regular
|
||
objects. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
return true;
|
||
|
||
p = strchr (h->root.root.string, ELF_VER_CHR);
|
||
if (p != NULL && h->verinfo.vertree == NULL)
|
||
{
|
||
struct bfd_elf_version_tree *t;
|
||
boolean hidden;
|
||
|
||
hidden = true;
|
||
|
||
/* There are two consecutive ELF_VER_CHR characters if this is
|
||
not a hidden symbol. */
|
||
++p;
|
||
if (*p == ELF_VER_CHR)
|
||
{
|
||
hidden = false;
|
||
++p;
|
||
}
|
||
|
||
/* If there is no version string, we can just return out. */
|
||
if (*p == '\0')
|
||
{
|
||
if (hidden)
|
||
h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
|
||
return true;
|
||
}
|
||
|
||
/* Look for the version. If we find it, it is no longer weak. */
|
||
for (t = sinfo->verdefs; t != NULL; t = t->next)
|
||
{
|
||
if (strcmp (t->name, p) == 0)
|
||
{
|
||
int len;
|
||
char *alc;
|
||
struct bfd_elf_version_expr *d;
|
||
|
||
len = p - h->root.root.string;
|
||
alc = bfd_alloc (sinfo->output_bfd, len);
|
||
if (alc == NULL)
|
||
return false;
|
||
strncpy (alc, h->root.root.string, len - 1);
|
||
alc[len - 1] = '\0';
|
||
if (alc[len - 2] == ELF_VER_CHR)
|
||
alc[len - 2] = '\0';
|
||
|
||
h->verinfo.vertree = t;
|
||
t->used = true;
|
||
d = NULL;
|
||
|
||
if (t->globals != NULL)
|
||
{
|
||
for (d = t->globals; d != NULL; d = d->next)
|
||
{
|
||
if ((d->match[0] == '*' && d->match[1] == '\0')
|
||
|| fnmatch (d->match, alc, 0) == 0)
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* See if there is anything to force this symbol to
|
||
local scope. */
|
||
if (d == NULL && t->locals != NULL)
|
||
{
|
||
for (d = t->locals; d != NULL; d = d->next)
|
||
{
|
||
if ((d->match[0] == '*' && d->match[1] == '\0')
|
||
|| fnmatch (d->match, alc, 0) == 0)
|
||
{
|
||
if (h->dynindx != -1
|
||
&& info->shared
|
||
&& ! sinfo->export_dynamic)
|
||
{
|
||
sinfo->removed_dynamic = true;
|
||
h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
|
||
h->elf_link_hash_flags &=~
|
||
ELF_LINK_HASH_NEEDS_PLT;
|
||
h->dynindx = -1;
|
||
h->plt.offset = (bfd_vma) -1;
|
||
/* FIXME: The name of the symbol has
|
||
already been recorded in the dynamic
|
||
string table section. */
|
||
}
|
||
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
bfd_release (sinfo->output_bfd, alc);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If we are building an application, we need to create a
|
||
version node for this version. */
|
||
if (t == NULL && ! info->shared)
|
||
{
|
||
struct bfd_elf_version_tree **pp;
|
||
int version_index;
|
||
|
||
/* If we aren't going to export this symbol, we don't need
|
||
to worry about it. */
|
||
if (h->dynindx == -1)
|
||
return true;
|
||
|
||
t = ((struct bfd_elf_version_tree *)
|
||
bfd_alloc (sinfo->output_bfd, sizeof *t));
|
||
if (t == NULL)
|
||
{
|
||
sinfo->failed = true;
|
||
return false;
|
||
}
|
||
|
||
t->next = NULL;
|
||
t->name = p;
|
||
t->globals = NULL;
|
||
t->locals = NULL;
|
||
t->deps = NULL;
|
||
t->name_indx = (unsigned int) -1;
|
||
t->used = true;
|
||
|
||
version_index = 1;
|
||
for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
|
||
++version_index;
|
||
t->vernum = version_index;
|
||
|
||
*pp = t;
|
||
|
||
h->verinfo.vertree = t;
|
||
}
|
||
else if (t == NULL)
|
||
{
|
||
/* We could not find the version for a symbol when
|
||
generating a shared archive. Return an error. */
|
||
(*_bfd_error_handler)
|
||
(_("%s: undefined versioned symbol name %s"),
|
||
bfd_get_filename (sinfo->output_bfd), h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
sinfo->failed = true;
|
||
return false;
|
||
}
|
||
|
||
if (hidden)
|
||
h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
|
||
}
|
||
|
||
/* If we don't have a version for this symbol, see if we can find
|
||
something. */
|
||
if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
|
||
{
|
||
struct bfd_elf_version_tree *t;
|
||
struct bfd_elf_version_tree *deflt;
|
||
struct bfd_elf_version_expr *d;
|
||
|
||
/* See if can find what version this symbol is in. If the
|
||
symbol is supposed to be local, then don't actually register
|
||
it. */
|
||
deflt = NULL;
|
||
for (t = sinfo->verdefs; t != NULL; t = t->next)
|
||
{
|
||
if (t->globals != NULL)
|
||
{
|
||
for (d = t->globals; d != NULL; d = d->next)
|
||
{
|
||
if (fnmatch (d->match, h->root.root.string, 0) == 0)
|
||
{
|
||
h->verinfo.vertree = t;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (d != NULL)
|
||
break;
|
||
}
|
||
|
||
if (t->locals != NULL)
|
||
{
|
||
for (d = t->locals; d != NULL; d = d->next)
|
||
{
|
||
if (d->match[0] == '*' && d->match[1] == '\0')
|
||
deflt = t;
|
||
else if (fnmatch (d->match, h->root.root.string, 0) == 0)
|
||
{
|
||
h->verinfo.vertree = t;
|
||
if (h->dynindx != -1
|
||
&& info->shared
|
||
&& ! sinfo->export_dynamic)
|
||
{
|
||
sinfo->removed_dynamic = true;
|
||
h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
|
||
h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
|
||
h->dynindx = -1;
|
||
h->plt.offset = (bfd_vma) -1;
|
||
/* FIXME: The name of the symbol has already
|
||
been recorded in the dynamic string table
|
||
section. */
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (d != NULL)
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (deflt != NULL && h->verinfo.vertree == NULL)
|
||
{
|
||
h->verinfo.vertree = deflt;
|
||
if (h->dynindx != -1
|
||
&& info->shared
|
||
&& ! sinfo->export_dynamic)
|
||
{
|
||
sinfo->removed_dynamic = true;
|
||
h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
|
||
h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
|
||
h->dynindx = -1;
|
||
h->plt.offset = (bfd_vma) -1;
|
||
/* FIXME: The name of the symbol has already been
|
||
recorded in the dynamic string table section. */
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* This function is used to renumber the dynamic symbols, if some of
|
||
them are removed because they are marked as local. This is called
|
||
via elf_link_hash_traverse. */
|
||
|
||
static boolean
|
||
elf_link_renumber_dynsyms (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
struct bfd_link_info *info = (struct bfd_link_info *) data;
|
||
|
||
if (h->dynindx != -1)
|
||
{
|
||
h->dynindx = elf_hash_table (info)->dynsymcount;
|
||
++elf_hash_table (info)->dynsymcount;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Final phase of ELF linker. */
|
||
|
||
/* A structure we use to avoid passing large numbers of arguments. */
|
||
|
||
struct elf_final_link_info
|
||
{
|
||
/* General link information. */
|
||
struct bfd_link_info *info;
|
||
/* Output BFD. */
|
||
bfd *output_bfd;
|
||
/* Symbol string table. */
|
||
struct bfd_strtab_hash *symstrtab;
|
||
/* .dynsym section. */
|
||
asection *dynsym_sec;
|
||
/* .hash section. */
|
||
asection *hash_sec;
|
||
/* symbol version section (.gnu.version). */
|
||
asection *symver_sec;
|
||
/* Buffer large enough to hold contents of any section. */
|
||
bfd_byte *contents;
|
||
/* Buffer large enough to hold external relocs of any section. */
|
||
PTR external_relocs;
|
||
/* Buffer large enough to hold internal relocs of any section. */
|
||
Elf_Internal_Rela *internal_relocs;
|
||
/* Buffer large enough to hold external local symbols of any input
|
||
BFD. */
|
||
Elf_External_Sym *external_syms;
|
||
/* Buffer large enough to hold internal local symbols of any input
|
||
BFD. */
|
||
Elf_Internal_Sym *internal_syms;
|
||
/* Array large enough to hold a symbol index for each local symbol
|
||
of any input BFD. */
|
||
long *indices;
|
||
/* Array large enough to hold a section pointer for each local
|
||
symbol of any input BFD. */
|
||
asection **sections;
|
||
/* Buffer to hold swapped out symbols. */
|
||
Elf_External_Sym *symbuf;
|
||
/* Number of swapped out symbols in buffer. */
|
||
size_t symbuf_count;
|
||
/* Number of symbols which fit in symbuf. */
|
||
size_t symbuf_size;
|
||
};
|
||
|
||
static boolean elf_link_output_sym
|
||
PARAMS ((struct elf_final_link_info *, const char *,
|
||
Elf_Internal_Sym *, asection *));
|
||
static boolean elf_link_flush_output_syms
|
||
PARAMS ((struct elf_final_link_info *));
|
||
static boolean elf_link_output_extsym
|
||
PARAMS ((struct elf_link_hash_entry *, PTR));
|
||
static boolean elf_link_input_bfd
|
||
PARAMS ((struct elf_final_link_info *, bfd *));
|
||
static boolean elf_reloc_link_order
|
||
PARAMS ((bfd *, struct bfd_link_info *, asection *,
|
||
struct bfd_link_order *));
|
||
|
||
/* This struct is used to pass information to elf_link_output_extsym. */
|
||
|
||
struct elf_outext_info
|
||
{
|
||
boolean failed;
|
||
boolean localsyms;
|
||
struct elf_final_link_info *finfo;
|
||
};
|
||
|
||
/* Do the final step of an ELF link. */
|
||
|
||
boolean
|
||
elf_bfd_final_link (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
boolean dynamic;
|
||
bfd *dynobj;
|
||
struct elf_final_link_info finfo;
|
||
register asection *o;
|
||
register struct bfd_link_order *p;
|
||
register bfd *sub;
|
||
size_t max_contents_size;
|
||
size_t max_external_reloc_size;
|
||
size_t max_internal_reloc_count;
|
||
size_t max_sym_count;
|
||
file_ptr off;
|
||
Elf_Internal_Sym elfsym;
|
||
unsigned int i;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Shdr *symstrtab_hdr;
|
||
struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct elf_outext_info eoinfo;
|
||
|
||
if (info->shared)
|
||
abfd->flags |= DYNAMIC;
|
||
|
||
dynamic = elf_hash_table (info)->dynamic_sections_created;
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
finfo.info = info;
|
||
finfo.output_bfd = abfd;
|
||
finfo.symstrtab = elf_stringtab_init ();
|
||
if (finfo.symstrtab == NULL)
|
||
return false;
|
||
|
||
if (! dynamic)
|
||
{
|
||
finfo.dynsym_sec = NULL;
|
||
finfo.hash_sec = NULL;
|
||
finfo.symver_sec = NULL;
|
||
}
|
||
else
|
||
{
|
||
finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
|
||
finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
|
||
BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
|
||
finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
|
||
/* Note that it is OK if symver_sec is NULL. */
|
||
}
|
||
|
||
finfo.contents = NULL;
|
||
finfo.external_relocs = NULL;
|
||
finfo.internal_relocs = NULL;
|
||
finfo.external_syms = NULL;
|
||
finfo.internal_syms = NULL;
|
||
finfo.indices = NULL;
|
||
finfo.sections = NULL;
|
||
finfo.symbuf = NULL;
|
||
finfo.symbuf_count = 0;
|
||
|
||
/* Count up the number of relocations we will output for each output
|
||
section, so that we know the sizes of the reloc sections. We
|
||
also figure out some maximum sizes. */
|
||
max_contents_size = 0;
|
||
max_external_reloc_size = 0;
|
||
max_internal_reloc_count = 0;
|
||
max_sym_count = 0;
|
||
for (o = abfd->sections; o != (asection *) NULL; o = o->next)
|
||
{
|
||
o->reloc_count = 0;
|
||
|
||
for (p = o->link_order_head; p != NULL; p = p->next)
|
||
{
|
||
if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
++o->reloc_count;
|
||
else if (p->type == bfd_indirect_link_order)
|
||
{
|
||
asection *sec;
|
||
|
||
sec = p->u.indirect.section;
|
||
|
||
/* Mark all sections which are to be included in the
|
||
link. This will normally be every section. We need
|
||
to do this so that we can identify any sections which
|
||
the linker has decided to not include. */
|
||
sec->linker_mark = true;
|
||
|
||
if (info->relocateable)
|
||
o->reloc_count += sec->reloc_count;
|
||
|
||
if (sec->_raw_size > max_contents_size)
|
||
max_contents_size = sec->_raw_size;
|
||
if (sec->_cooked_size > max_contents_size)
|
||
max_contents_size = sec->_cooked_size;
|
||
|
||
/* We are interested in just local symbols, not all
|
||
symbols. */
|
||
if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
|
||
&& (sec->owner->flags & DYNAMIC) == 0)
|
||
{
|
||
size_t sym_count;
|
||
|
||
if (elf_bad_symtab (sec->owner))
|
||
sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
|
||
/ sizeof (Elf_External_Sym));
|
||
else
|
||
sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
|
||
|
||
if (sym_count > max_sym_count)
|
||
max_sym_count = sym_count;
|
||
|
||
if ((sec->flags & SEC_RELOC) != 0)
|
||
{
|
||
size_t ext_size;
|
||
|
||
ext_size = elf_section_data (sec)->rel_hdr.sh_size;
|
||
if (ext_size > max_external_reloc_size)
|
||
max_external_reloc_size = ext_size;
|
||
if (sec->reloc_count > max_internal_reloc_count)
|
||
max_internal_reloc_count = sec->reloc_count;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (o->reloc_count > 0)
|
||
o->flags |= SEC_RELOC;
|
||
else
|
||
{
|
||
/* Explicitly clear the SEC_RELOC flag. The linker tends to
|
||
set it (this is probably a bug) and if it is set
|
||
assign_section_numbers will create a reloc section. */
|
||
o->flags &=~ SEC_RELOC;
|
||
}
|
||
|
||
/* If the SEC_ALLOC flag is not set, force the section VMA to
|
||
zero. This is done in elf_fake_sections as well, but forcing
|
||
the VMA to 0 here will ensure that relocs against these
|
||
sections are handled correctly. */
|
||
if ((o->flags & SEC_ALLOC) == 0
|
||
&& ! o->user_set_vma)
|
||
o->vma = 0;
|
||
}
|
||
|
||
/* Figure out the file positions for everything but the symbol table
|
||
and the relocs. We set symcount to force assign_section_numbers
|
||
to create a symbol table. */
|
||
abfd->symcount = info->strip == strip_all ? 0 : 1;
|
||
BFD_ASSERT (! abfd->output_has_begun);
|
||
if (! _bfd_elf_compute_section_file_positions (abfd, info))
|
||
goto error_return;
|
||
|
||
/* That created the reloc sections. Set their sizes, and assign
|
||
them file positions, and allocate some buffers. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
register struct elf_link_hash_entry **p, **pend;
|
||
|
||
rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
|
||
rel_hdr->sh_size = rel_hdr->sh_entsize * o->reloc_count;
|
||
|
||
/* The contents field must last into write_object_contents,
|
||
so we allocate it with bfd_alloc rather than malloc. */
|
||
rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size);
|
||
if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
|
||
goto error_return;
|
||
|
||
p = ((struct elf_link_hash_entry **)
|
||
bfd_malloc (o->reloc_count
|
||
* sizeof (struct elf_link_hash_entry *)));
|
||
if (p == NULL && o->reloc_count != 0)
|
||
goto error_return;
|
||
elf_section_data (o)->rel_hashes = p;
|
||
pend = p + o->reloc_count;
|
||
for (; p < pend; p++)
|
||
*p = NULL;
|
||
|
||
/* Use the reloc_count field as an index when outputting the
|
||
relocs. */
|
||
o->reloc_count = 0;
|
||
}
|
||
}
|
||
|
||
_bfd_elf_assign_file_positions_for_relocs (abfd);
|
||
|
||
/* We have now assigned file positions for all the sections except
|
||
.symtab and .strtab. We start the .symtab section at the current
|
||
file position, and write directly to it. We build the .strtab
|
||
section in memory. */
|
||
abfd->symcount = 0;
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
/* sh_name is set in prep_headers. */
|
||
symtab_hdr->sh_type = SHT_SYMTAB;
|
||
symtab_hdr->sh_flags = 0;
|
||
symtab_hdr->sh_addr = 0;
|
||
symtab_hdr->sh_size = 0;
|
||
symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
|
||
/* sh_link is set in assign_section_numbers. */
|
||
/* sh_info is set below. */
|
||
/* sh_offset is set just below. */
|
||
symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
|
||
|
||
off = elf_tdata (abfd)->next_file_pos;
|
||
off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
|
||
|
||
/* Note that at this point elf_tdata (abfd)->next_file_pos is
|
||
incorrect. We do not yet know the size of the .symtab section.
|
||
We correct next_file_pos below, after we do know the size. */
|
||
|
||
/* Allocate a buffer to hold swapped out symbols. This is to avoid
|
||
continuously seeking to the right position in the file. */
|
||
if (! info->keep_memory || max_sym_count < 20)
|
||
finfo.symbuf_size = 20;
|
||
else
|
||
finfo.symbuf_size = max_sym_count;
|
||
finfo.symbuf = ((Elf_External_Sym *)
|
||
bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
|
||
if (finfo.symbuf == NULL)
|
||
goto error_return;
|
||
|
||
/* Start writing out the symbol table. The first symbol is always a
|
||
dummy symbol. */
|
||
if (info->strip != strip_all || info->relocateable)
|
||
{
|
||
elfsym.st_value = 0;
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = 0;
|
||
elfsym.st_other = 0;
|
||
elfsym.st_shndx = SHN_UNDEF;
|
||
if (! elf_link_output_sym (&finfo, (const char *) NULL,
|
||
&elfsym, bfd_und_section_ptr))
|
||
goto error_return;
|
||
}
|
||
|
||
#if 0
|
||
/* Some standard ELF linkers do this, but we don't because it causes
|
||
bootstrap comparison failures. */
|
||
/* Output a file symbol for the output file as the second symbol.
|
||
We output this even if we are discarding local symbols, although
|
||
I'm not sure if this is correct. */
|
||
elfsym.st_value = 0;
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
|
||
elfsym.st_other = 0;
|
||
elfsym.st_shndx = SHN_ABS;
|
||
if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
|
||
&elfsym, bfd_abs_section_ptr))
|
||
goto error_return;
|
||
#endif
|
||
|
||
/* Output a symbol for each section. We output these even if we are
|
||
discarding local symbols, since they are used for relocs. These
|
||
symbols have no names. We store the index of each one in the
|
||
index field of the section, so that we can find it again when
|
||
outputting relocs. */
|
||
if (info->strip != strip_all || info->relocateable)
|
||
{
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
|
||
elfsym.st_other = 0;
|
||
for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
|
||
{
|
||
o = section_from_elf_index (abfd, i);
|
||
if (o != NULL)
|
||
o->target_index = abfd->symcount;
|
||
elfsym.st_shndx = i;
|
||
if (info->relocateable || o == NULL)
|
||
elfsym.st_value = 0;
|
||
else
|
||
elfsym.st_value = o->vma;
|
||
if (! elf_link_output_sym (&finfo, (const char *) NULL,
|
||
&elfsym, o))
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* Allocate some memory to hold information read in from the input
|
||
files. */
|
||
finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
|
||
finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
|
||
finfo.internal_relocs = ((Elf_Internal_Rela *)
|
||
bfd_malloc (max_internal_reloc_count
|
||
* sizeof (Elf_Internal_Rela)));
|
||
finfo.external_syms = ((Elf_External_Sym *)
|
||
bfd_malloc (max_sym_count
|
||
* sizeof (Elf_External_Sym)));
|
||
finfo.internal_syms = ((Elf_Internal_Sym *)
|
||
bfd_malloc (max_sym_count
|
||
* sizeof (Elf_Internal_Sym)));
|
||
finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
|
||
finfo.sections = ((asection **)
|
||
bfd_malloc (max_sym_count * sizeof (asection *)));
|
||
if ((finfo.contents == NULL && max_contents_size != 0)
|
||
|| (finfo.external_relocs == NULL && max_external_reloc_size != 0)
|
||
|| (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
|
||
|| (finfo.external_syms == NULL && max_sym_count != 0)
|
||
|| (finfo.internal_syms == NULL && max_sym_count != 0)
|
||
|| (finfo.indices == NULL && max_sym_count != 0)
|
||
|| (finfo.sections == NULL && max_sym_count != 0))
|
||
goto error_return;
|
||
|
||
/* Since ELF permits relocations to be against local symbols, we
|
||
must have the local symbols available when we do the relocations.
|
||
Since we would rather only read the local symbols once, and we
|
||
would rather not keep them in memory, we handle all the
|
||
relocations for a single input file at the same time.
|
||
|
||
Unfortunately, there is no way to know the total number of local
|
||
symbols until we have seen all of them, and the local symbol
|
||
indices precede the global symbol indices. This means that when
|
||
we are generating relocateable output, and we see a reloc against
|
||
a global symbol, we can not know the symbol index until we have
|
||
finished examining all the local symbols to see which ones we are
|
||
going to output. To deal with this, we keep the relocations in
|
||
memory, and don't output them until the end of the link. This is
|
||
an unfortunate waste of memory, but I don't see a good way around
|
||
it. Fortunately, it only happens when performing a relocateable
|
||
link, which is not the common case. FIXME: If keep_memory is set
|
||
we could write the relocs out and then read them again; I don't
|
||
know how bad the memory loss will be. */
|
||
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
sub->output_has_begun = false;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
for (p = o->link_order_head; p != NULL; p = p->next)
|
||
{
|
||
if (p->type == bfd_indirect_link_order
|
||
&& (bfd_get_flavour (p->u.indirect.section->owner)
|
||
== bfd_target_elf_flavour))
|
||
{
|
||
sub = p->u.indirect.section->owner;
|
||
if (! sub->output_has_begun)
|
||
{
|
||
if (! elf_link_input_bfd (&finfo, sub))
|
||
goto error_return;
|
||
sub->output_has_begun = true;
|
||
}
|
||
}
|
||
else if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
{
|
||
if (! elf_reloc_link_order (abfd, info, o, p))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
if (! _bfd_default_link_order (abfd, info, o, p))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* That wrote out all the local symbols. Finish up the symbol table
|
||
with the global symbols. */
|
||
|
||
if (info->strip != strip_all && info->shared)
|
||
{
|
||
/* Output any global symbols that got converted to local in a
|
||
version script. We do this in a separate step since ELF
|
||
requires all local symbols to appear prior to any global
|
||
symbols. FIXME: We should only do this if some global
|
||
symbols were, in fact, converted to become local. FIXME:
|
||
Will this work correctly with the Irix 5 linker? */
|
||
eoinfo.failed = false;
|
||
eoinfo.finfo = &finfo;
|
||
eoinfo.localsyms = true;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
|
||
(PTR) &eoinfo);
|
||
if (eoinfo.failed)
|
||
return false;
|
||
}
|
||
|
||
/* The sh_info field records the index of the first non local
|
||
symbol. */
|
||
symtab_hdr->sh_info = abfd->symcount;
|
||
if (dynamic)
|
||
elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = 1;
|
||
|
||
/* We get the global symbols from the hash table. */
|
||
eoinfo.failed = false;
|
||
eoinfo.localsyms = false;
|
||
eoinfo.finfo = &finfo;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
|
||
(PTR) &eoinfo);
|
||
if (eoinfo.failed)
|
||
return false;
|
||
|
||
/* Flush all symbols to the file. */
|
||
if (! elf_link_flush_output_syms (&finfo))
|
||
return false;
|
||
|
||
/* Now we know the size of the symtab section. */
|
||
off += symtab_hdr->sh_size;
|
||
|
||
/* Finish up and write out the symbol string table (.strtab)
|
||
section. */
|
||
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
|
||
/* sh_name was set in prep_headers. */
|
||
symstrtab_hdr->sh_type = SHT_STRTAB;
|
||
symstrtab_hdr->sh_flags = 0;
|
||
symstrtab_hdr->sh_addr = 0;
|
||
symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
|
||
symstrtab_hdr->sh_entsize = 0;
|
||
symstrtab_hdr->sh_link = 0;
|
||
symstrtab_hdr->sh_info = 0;
|
||
/* sh_offset is set just below. */
|
||
symstrtab_hdr->sh_addralign = 1;
|
||
|
||
off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
|
||
elf_tdata (abfd)->next_file_pos = off;
|
||
|
||
if (abfd->symcount > 0)
|
||
{
|
||
if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
|
||
return false;
|
||
}
|
||
|
||
/* Adjust the relocs to have the correct symbol indices. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
struct elf_link_hash_entry **rel_hash;
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
|
||
if ((o->flags & SEC_RELOC) == 0)
|
||
continue;
|
||
|
||
rel_hash = elf_section_data (o)->rel_hashes;
|
||
rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
for (i = 0; i < o->reloc_count; i++, rel_hash++)
|
||
{
|
||
if (*rel_hash == NULL)
|
||
continue;
|
||
|
||
BFD_ASSERT ((*rel_hash)->indx >= 0);
|
||
|
||
if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
|
||
{
|
||
Elf_External_Rel *erel;
|
||
Elf_Internal_Rel irel;
|
||
|
||
erel = (Elf_External_Rel *) rel_hdr->contents + i;
|
||
elf_swap_reloc_in (abfd, erel, &irel);
|
||
irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
|
||
ELF_R_TYPE (irel.r_info));
|
||
elf_swap_reloc_out (abfd, &irel, erel);
|
||
}
|
||
else
|
||
{
|
||
Elf_External_Rela *erela;
|
||
Elf_Internal_Rela irela;
|
||
|
||
BFD_ASSERT (rel_hdr->sh_entsize
|
||
== sizeof (Elf_External_Rela));
|
||
|
||
erela = (Elf_External_Rela *) rel_hdr->contents + i;
|
||
elf_swap_reloca_in (abfd, erela, &irela);
|
||
irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
|
||
ELF_R_TYPE (irela.r_info));
|
||
elf_swap_reloca_out (abfd, &irela, erela);
|
||
}
|
||
}
|
||
|
||
/* Set the reloc_count field to 0 to prevent write_relocs from
|
||
trying to swap the relocs out itself. */
|
||
o->reloc_count = 0;
|
||
}
|
||
|
||
/* If we are linking against a dynamic object, or generating a
|
||
shared library, finish up the dynamic linking information. */
|
||
if (dynamic)
|
||
{
|
||
Elf_External_Dyn *dyncon, *dynconend;
|
||
|
||
/* Fix up .dynamic entries. */
|
||
o = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
BFD_ASSERT (o != NULL);
|
||
|
||
dyncon = (Elf_External_Dyn *) o->contents;
|
||
dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
const char *name;
|
||
unsigned int type;
|
||
|
||
elf_swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
switch (dyn.d_tag)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
/* SVR4 linkers seem to set DT_INIT and DT_FINI based on
|
||
magic _init and _fini symbols. This is pretty ugly,
|
||
but we are compatible. */
|
||
case DT_INIT:
|
||
name = "_init";
|
||
goto get_sym;
|
||
case DT_FINI:
|
||
name = "_fini";
|
||
get_sym:
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name,
|
||
false, false, true);
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
dyn.d_un.d_val = h->root.u.def.value;
|
||
o = h->root.u.def.section;
|
||
if (o->output_section != NULL)
|
||
dyn.d_un.d_val += (o->output_section->vma
|
||
+ o->output_offset);
|
||
else
|
||
{
|
||
/* The symbol is imported from another shared
|
||
library and does not apply to this one. */
|
||
dyn.d_un.d_val = 0;
|
||
}
|
||
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DT_HASH:
|
||
name = ".hash";
|
||
goto get_vma;
|
||
case DT_STRTAB:
|
||
name = ".dynstr";
|
||
goto get_vma;
|
||
case DT_SYMTAB:
|
||
name = ".dynsym";
|
||
goto get_vma;
|
||
case DT_VERDEF:
|
||
name = ".gnu.version_d";
|
||
goto get_vma;
|
||
case DT_VERNEED:
|
||
name = ".gnu.version_r";
|
||
goto get_vma;
|
||
case DT_VERSYM:
|
||
name = ".gnu.version";
|
||
get_vma:
|
||
o = bfd_get_section_by_name (abfd, name);
|
||
BFD_ASSERT (o != NULL);
|
||
dyn.d_un.d_ptr = o->vma;
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
break;
|
||
|
||
case DT_REL:
|
||
case DT_RELA:
|
||
case DT_RELSZ:
|
||
case DT_RELASZ:
|
||
if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
|
||
type = SHT_REL;
|
||
else
|
||
type = SHT_RELA;
|
||
dyn.d_un.d_val = 0;
|
||
for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
|
||
{
|
||
Elf_Internal_Shdr *hdr;
|
||
|
||
hdr = elf_elfsections (abfd)[i];
|
||
if (hdr->sh_type == type
|
||
&& (hdr->sh_flags & SHF_ALLOC) != 0)
|
||
{
|
||
if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
|
||
dyn.d_un.d_val += hdr->sh_size;
|
||
else
|
||
{
|
||
if (dyn.d_un.d_val == 0
|
||
|| hdr->sh_addr < dyn.d_un.d_val)
|
||
dyn.d_un.d_val = hdr->sh_addr;
|
||
}
|
||
}
|
||
}
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If we have created any dynamic sections, then output them. */
|
||
if (dynobj != NULL)
|
||
{
|
||
if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
|
||
goto error_return;
|
||
|
||
for (o = dynobj->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_HAS_CONTENTS) == 0
|
||
|| o->_raw_size == 0)
|
||
continue;
|
||
if ((o->flags & SEC_LINKER_CREATED) == 0)
|
||
{
|
||
/* At this point, we are only interested in sections
|
||
created by elf_link_create_dynamic_sections. */
|
||
continue;
|
||
}
|
||
if ((elf_section_data (o->output_section)->this_hdr.sh_type
|
||
!= SHT_STRTAB)
|
||
|| strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
|
||
{
|
||
if (! bfd_set_section_contents (abfd, o->output_section,
|
||
o->contents, o->output_offset,
|
||
o->_raw_size))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
file_ptr off;
|
||
|
||
/* The contents of the .dynstr section are actually in a
|
||
stringtab. */
|
||
off = elf_section_data (o->output_section)->this_hdr.sh_offset;
|
||
if (bfd_seek (abfd, off, SEEK_SET) != 0
|
||
|| ! _bfd_stringtab_emit (abfd,
|
||
elf_hash_table (info)->dynstr))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If we have optimized stabs strings, output them. */
|
||
if (elf_hash_table (info)->stab_info != NULL)
|
||
{
|
||
if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
|
||
goto error_return;
|
||
}
|
||
|
||
if (finfo.symstrtab != NULL)
|
||
_bfd_stringtab_free (finfo.symstrtab);
|
||
if (finfo.contents != NULL)
|
||
free (finfo.contents);
|
||
if (finfo.external_relocs != NULL)
|
||
free (finfo.external_relocs);
|
||
if (finfo.internal_relocs != NULL)
|
||
free (finfo.internal_relocs);
|
||
if (finfo.external_syms != NULL)
|
||
free (finfo.external_syms);
|
||
if (finfo.internal_syms != NULL)
|
||
free (finfo.internal_syms);
|
||
if (finfo.indices != NULL)
|
||
free (finfo.indices);
|
||
if (finfo.sections != NULL)
|
||
free (finfo.sections);
|
||
if (finfo.symbuf != NULL)
|
||
free (finfo.symbuf);
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0
|
||
&& elf_section_data (o)->rel_hashes != NULL)
|
||
free (elf_section_data (o)->rel_hashes);
|
||
}
|
||
|
||
elf_tdata (abfd)->linker = true;
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (finfo.symstrtab != NULL)
|
||
_bfd_stringtab_free (finfo.symstrtab);
|
||
if (finfo.contents != NULL)
|
||
free (finfo.contents);
|
||
if (finfo.external_relocs != NULL)
|
||
free (finfo.external_relocs);
|
||
if (finfo.internal_relocs != NULL)
|
||
free (finfo.internal_relocs);
|
||
if (finfo.external_syms != NULL)
|
||
free (finfo.external_syms);
|
||
if (finfo.internal_syms != NULL)
|
||
free (finfo.internal_syms);
|
||
if (finfo.indices != NULL)
|
||
free (finfo.indices);
|
||
if (finfo.sections != NULL)
|
||
free (finfo.sections);
|
||
if (finfo.symbuf != NULL)
|
||
free (finfo.symbuf);
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0
|
||
&& elf_section_data (o)->rel_hashes != NULL)
|
||
free (elf_section_data (o)->rel_hashes);
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Add a symbol to the output symbol table. */
|
||
|
||
static boolean
|
||
elf_link_output_sym (finfo, name, elfsym, input_sec)
|
||
struct elf_final_link_info *finfo;
|
||
const char *name;
|
||
Elf_Internal_Sym *elfsym;
|
||
asection *input_sec;
|
||
{
|
||
boolean (*output_symbol_hook) PARAMS ((bfd *,
|
||
struct bfd_link_info *info,
|
||
const char *,
|
||
Elf_Internal_Sym *,
|
||
asection *));
|
||
|
||
output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
|
||
elf_backend_link_output_symbol_hook;
|
||
if (output_symbol_hook != NULL)
|
||
{
|
||
if (! ((*output_symbol_hook)
|
||
(finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
|
||
return false;
|
||
}
|
||
|
||
if (name == (const char *) NULL || *name == '\0')
|
||
elfsym->st_name = 0;
|
||
else
|
||
{
|
||
elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
|
||
name, true,
|
||
false);
|
||
if (elfsym->st_name == (unsigned long) -1)
|
||
return false;
|
||
}
|
||
|
||
if (finfo->symbuf_count >= finfo->symbuf_size)
|
||
{
|
||
if (! elf_link_flush_output_syms (finfo))
|
||
return false;
|
||
}
|
||
|
||
elf_swap_symbol_out (finfo->output_bfd, elfsym,
|
||
(PTR) (finfo->symbuf + finfo->symbuf_count));
|
||
++finfo->symbuf_count;
|
||
|
||
++finfo->output_bfd->symcount;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Flush the output symbols to the file. */
|
||
|
||
static boolean
|
||
elf_link_flush_output_syms (finfo)
|
||
struct elf_final_link_info *finfo;
|
||
{
|
||
if (finfo->symbuf_count > 0)
|
||
{
|
||
Elf_Internal_Shdr *symtab;
|
||
|
||
symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
|
||
|
||
if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
|
||
SEEK_SET) != 0
|
||
|| (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
|
||
sizeof (Elf_External_Sym), finfo->output_bfd)
|
||
!= finfo->symbuf_count * sizeof (Elf_External_Sym)))
|
||
return false;
|
||
|
||
symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
|
||
|
||
finfo->symbuf_count = 0;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Add an external symbol to the symbol table. This is called from
|
||
the hash table traversal routine. When generating a shared object,
|
||
we go through the symbol table twice. The first time we output
|
||
anything that might have been forced to local scope in a version
|
||
script. The second time we output the symbols that are still
|
||
global symbols. */
|
||
|
||
static boolean
|
||
elf_link_output_extsym (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
|
||
struct elf_final_link_info *finfo = eoinfo->finfo;
|
||
boolean strip;
|
||
Elf_Internal_Sym sym;
|
||
asection *input_sec;
|
||
|
||
/* Decide whether to output this symbol in this pass. */
|
||
if (eoinfo->localsyms)
|
||
{
|
||
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
||
return true;
|
||
}
|
||
else
|
||
{
|
||
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
|
||
return true;
|
||
}
|
||
|
||
/* If we are not creating a shared library, and this symbol is
|
||
referenced by a shared library but is not defined anywhere, then
|
||
warn that it is undefined. If we do not do this, the runtime
|
||
linker will complain that the symbol is undefined when the
|
||
program is run. We don't have to worry about symbols that are
|
||
referenced by regular files, because we will already have issued
|
||
warnings for them. */
|
||
if (! finfo->info->relocateable
|
||
&& ! finfo->info->shared
|
||
&& h->root.type == bfd_link_hash_undefined
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
|
||
{
|
||
if (! ((*finfo->info->callbacks->undefined_symbol)
|
||
(finfo->info, h->root.root.string, h->root.u.undef.abfd,
|
||
(asection *) NULL, 0)))
|
||
{
|
||
eoinfo->failed = true;
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/* We don't want to output symbols that have never been mentioned by
|
||
a regular file, or that we have been told to strip. However, if
|
||
h->indx is set to -2, the symbol is used by a reloc and we must
|
||
output it. */
|
||
if (h->indx == -2)
|
||
strip = false;
|
||
else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
|| (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
|
||
strip = true;
|
||
else if (finfo->info->strip == strip_all
|
||
|| (finfo->info->strip == strip_some
|
||
&& bfd_hash_lookup (finfo->info->keep_hash,
|
||
h->root.root.string,
|
||
false, false) == NULL))
|
||
strip = true;
|
||
else
|
||
strip = false;
|
||
|
||
/* If we're stripping it, and it's not a dynamic symbol, there's
|
||
nothing else to do. */
|
||
if (strip && h->dynindx == -1)
|
||
return true;
|
||
|
||
sym.st_value = 0;
|
||
sym.st_size = h->size;
|
||
sym.st_other = h->other;
|
||
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
|
||
sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
|
||
else if (h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
|
||
else
|
||
sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
case bfd_link_hash_new:
|
||
abort ();
|
||
return false;
|
||
|
||
case bfd_link_hash_undefined:
|
||
input_sec = bfd_und_section_ptr;
|
||
sym.st_shndx = SHN_UNDEF;
|
||
break;
|
||
|
||
case bfd_link_hash_undefweak:
|
||
input_sec = bfd_und_section_ptr;
|
||
sym.st_shndx = SHN_UNDEF;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
{
|
||
input_sec = h->root.u.def.section;
|
||
if (input_sec->output_section != NULL)
|
||
{
|
||
sym.st_shndx =
|
||
_bfd_elf_section_from_bfd_section (finfo->output_bfd,
|
||
input_sec->output_section);
|
||
if (sym.st_shndx == (unsigned short) -1)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: could not find output section %s for input section %s"),
|
||
bfd_get_filename (finfo->output_bfd),
|
||
input_sec->output_section->name,
|
||
input_sec->name);
|
||
eoinfo->failed = true;
|
||
return false;
|
||
}
|
||
|
||
/* ELF symbols in relocateable files are section relative,
|
||
but in nonrelocateable files they are virtual
|
||
addresses. */
|
||
sym.st_value = h->root.u.def.value + input_sec->output_offset;
|
||
if (! finfo->info->relocateable)
|
||
sym.st_value += input_sec->output_section->vma;
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT (input_sec->owner == NULL
|
||
|| (input_sec->owner->flags & DYNAMIC) != 0);
|
||
sym.st_shndx = SHN_UNDEF;
|
||
input_sec = bfd_und_section_ptr;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
input_sec = h->root.u.c.p->section;
|
||
sym.st_shndx = SHN_COMMON;
|
||
sym.st_value = 1 << h->root.u.c.p->alignment_power;
|
||
break;
|
||
|
||
case bfd_link_hash_indirect:
|
||
/* These symbols are created by symbol versioning. They point
|
||
to the decorated version of the name. For example, if the
|
||
symbol foo@@GNU_1.2 is the default, which should be used when
|
||
foo is used with no version, then we add an indirect symbol
|
||
foo which points to foo@@GNU_1.2. We ignore these symbols,
|
||
since the indirected symbol is already in the hash table. If
|
||
the indirect symbol is non-ELF, fall through and output it. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) == 0)
|
||
return true;
|
||
|
||
/* Fall through. */
|
||
case bfd_link_hash_warning:
|
||
/* We can't represent these symbols in ELF, although a warning
|
||
symbol may have come from a .gnu.warning.SYMBOL section. We
|
||
just put the target symbol in the hash table. If the target
|
||
symbol does not really exist, don't do anything. */
|
||
if (h->root.u.i.link->type == bfd_link_hash_new)
|
||
return true;
|
||
return (elf_link_output_extsym
|
||
((struct elf_link_hash_entry *) h->root.u.i.link, data));
|
||
}
|
||
|
||
/* Give the processor backend a chance to tweak the symbol value,
|
||
and also to finish up anything that needs to be done for this
|
||
symbol. */
|
||
if ((h->dynindx != -1
|
||
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
|
||
&& elf_hash_table (finfo->info)->dynamic_sections_created)
|
||
{
|
||
struct elf_backend_data *bed;
|
||
|
||
bed = get_elf_backend_data (finfo->output_bfd);
|
||
if (! ((*bed->elf_backend_finish_dynamic_symbol)
|
||
(finfo->output_bfd, finfo->info, h, &sym)))
|
||
{
|
||
eoinfo->failed = true;
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/* If this symbol should be put in the .dynsym section, then put it
|
||
there now. We have already know the symbol index. We also fill
|
||
in the entry in the .hash section. */
|
||
if (h->dynindx != -1
|
||
&& elf_hash_table (finfo->info)->dynamic_sections_created)
|
||
{
|
||
size_t bucketcount;
|
||
size_t bucket;
|
||
bfd_byte *bucketpos;
|
||
bfd_vma chain;
|
||
|
||
sym.st_name = h->dynstr_index;
|
||
|
||
elf_swap_symbol_out (finfo->output_bfd, &sym,
|
||
(PTR) (((Elf_External_Sym *)
|
||
finfo->dynsym_sec->contents)
|
||
+ h->dynindx));
|
||
|
||
bucketcount = elf_hash_table (finfo->info)->bucketcount;
|
||
bucket = h->elf_hash_value % bucketcount;
|
||
bucketpos = ((bfd_byte *) finfo->hash_sec->contents
|
||
+ (bucket + 2) * (ARCH_SIZE / 8));
|
||
chain = get_word (finfo->output_bfd, bucketpos);
|
||
put_word (finfo->output_bfd, h->dynindx, bucketpos);
|
||
put_word (finfo->output_bfd, chain,
|
||
((bfd_byte *) finfo->hash_sec->contents
|
||
+ (bucketcount + 2 + h->dynindx) * (ARCH_SIZE / 8)));
|
||
|
||
if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
|
||
{
|
||
Elf_Internal_Versym iversym;
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
{
|
||
if (h->verinfo.verdef == NULL)
|
||
iversym.vs_vers = 0;
|
||
else
|
||
iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
|
||
}
|
||
else
|
||
{
|
||
if (h->verinfo.vertree == NULL)
|
||
iversym.vs_vers = 1;
|
||
else
|
||
iversym.vs_vers = h->verinfo.vertree->vernum + 1;
|
||
}
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
|
||
iversym.vs_vers |= VERSYM_HIDDEN;
|
||
|
||
_bfd_elf_swap_versym_out (finfo->output_bfd, &iversym,
|
||
(((Elf_External_Versym *)
|
||
finfo->symver_sec->contents)
|
||
+ h->dynindx));
|
||
}
|
||
}
|
||
|
||
/* If we're stripping it, then it was just a dynamic symbol, and
|
||
there's nothing else to do. */
|
||
if (strip)
|
||
return true;
|
||
|
||
h->indx = finfo->output_bfd->symcount;
|
||
|
||
if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
|
||
{
|
||
eoinfo->failed = true;
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Link an input file into the linker output file. This function
|
||
handles all the sections and relocations of the input file at once.
|
||
This is so that we only have to read the local symbols once, and
|
||
don't have to keep them in memory. */
|
||
|
||
static boolean
|
||
elf_link_input_bfd (finfo, input_bfd)
|
||
struct elf_final_link_info *finfo;
|
||
bfd *input_bfd;
|
||
{
|
||
boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
|
||
bfd *, asection *, bfd_byte *,
|
||
Elf_Internal_Rela *,
|
||
Elf_Internal_Sym *, asection **));
|
||
bfd *output_bfd;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
size_t locsymcount;
|
||
size_t extsymoff;
|
||
Elf_External_Sym *external_syms;
|
||
Elf_External_Sym *esym;
|
||
Elf_External_Sym *esymend;
|
||
Elf_Internal_Sym *isym;
|
||
long *pindex;
|
||
asection **ppsection;
|
||
asection *o;
|
||
|
||
output_bfd = finfo->output_bfd;
|
||
relocate_section =
|
||
get_elf_backend_data (output_bfd)->elf_backend_relocate_section;
|
||
|
||
/* If this is a dynamic object, we don't want to do anything here:
|
||
we don't want the local symbols, and we don't want the section
|
||
contents. */
|
||
if ((input_bfd->flags & DYNAMIC) != 0)
|
||
return true;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
locsymcount = symtab_hdr->sh_info;
|
||
extsymoff = symtab_hdr->sh_info;
|
||
}
|
||
|
||
/* Read the local symbols. */
|
||
if (symtab_hdr->contents != NULL)
|
||
external_syms = (Elf_External_Sym *) symtab_hdr->contents;
|
||
else if (locsymcount == 0)
|
||
external_syms = NULL;
|
||
else
|
||
{
|
||
external_syms = finfo->external_syms;
|
||
if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_read (external_syms, sizeof (Elf_External_Sym),
|
||
locsymcount, input_bfd)
|
||
!= locsymcount * sizeof (Elf_External_Sym)))
|
||
return false;
|
||
}
|
||
|
||
/* Swap in the local symbols and write out the ones which we know
|
||
are going into the output file. */
|
||
esym = external_syms;
|
||
esymend = esym + locsymcount;
|
||
isym = finfo->internal_syms;
|
||
pindex = finfo->indices;
|
||
ppsection = finfo->sections;
|
||
for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
|
||
{
|
||
asection *isec;
|
||
const char *name;
|
||
Elf_Internal_Sym osym;
|
||
|
||
elf_swap_symbol_in (input_bfd, esym, isym);
|
||
*pindex = -1;
|
||
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
|
||
{
|
||
*ppsection = NULL;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
isec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
|
||
isec = section_from_elf_index (input_bfd, isym->st_shndx);
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
isec = bfd_abs_section_ptr;
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
isec = bfd_com_section_ptr;
|
||
else
|
||
{
|
||
/* Who knows? */
|
||
isec = NULL;
|
||
}
|
||
|
||
*ppsection = isec;
|
||
|
||
/* Don't output the first, undefined, symbol. */
|
||
if (esym == external_syms)
|
||
continue;
|
||
|
||
/* If we are stripping all symbols, we don't want to output this
|
||
one. */
|
||
if (finfo->info->strip == strip_all)
|
||
continue;
|
||
|
||
/* We never output section symbols. Instead, we use the section
|
||
symbol of the corresponding section in the output file. */
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
|
||
continue;
|
||
|
||
/* If we are discarding all local symbols, we don't want to
|
||
output this one. If we are generating a relocateable output
|
||
file, then some of the local symbols may be required by
|
||
relocs; we output them below as we discover that they are
|
||
needed. */
|
||
if (finfo->info->discard == discard_all)
|
||
continue;
|
||
|
||
/* If this symbol is defined in a section which we are
|
||
discarding, we don't need to keep it, but note that
|
||
linker_mark is only reliable for sections that have contents.
|
||
For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
|
||
as well as linker_mark. */
|
||
if (isym->st_shndx > 0
|
||
&& isym->st_shndx < SHN_LORESERVE
|
||
&& isec != NULL
|
||
&& ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
|
||
|| (! finfo->info->relocateable
|
||
&& (isec->flags & SEC_EXCLUDE) != 0)))
|
||
continue;
|
||
|
||
/* Get the name of the symbol. */
|
||
name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
return false;
|
||
|
||
/* See if we are discarding symbols with this name. */
|
||
if ((finfo->info->strip == strip_some
|
||
&& (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
|
||
== NULL))
|
||
|| (finfo->info->discard == discard_l
|
||
&& bfd_is_local_label_name (input_bfd, name)))
|
||
continue;
|
||
|
||
/* If we get here, we are going to output this symbol. */
|
||
|
||
osym = *isym;
|
||
|
||
/* Adjust the section index for the output file. */
|
||
osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
|
||
isec->output_section);
|
||
if (osym.st_shndx == (unsigned short) -1)
|
||
return false;
|
||
|
||
*pindex = output_bfd->symcount;
|
||
|
||
/* ELF symbols in relocateable files are section relative, but
|
||
in executable files they are virtual addresses. Note that
|
||
this code assumes that all ELF sections have an associated
|
||
BFD section with a reasonable value for output_offset; below
|
||
we assume that they also have a reasonable value for
|
||
output_section. Any special sections must be set up to meet
|
||
these requirements. */
|
||
osym.st_value += isec->output_offset;
|
||
if (! finfo->info->relocateable)
|
||
osym.st_value += isec->output_section->vma;
|
||
|
||
if (! elf_link_output_sym (finfo, name, &osym, isec))
|
||
return false;
|
||
}
|
||
|
||
/* Relocate the contents of each section. */
|
||
for (o = input_bfd->sections; o != NULL; o = o->next)
|
||
{
|
||
bfd_byte *contents;
|
||
|
||
if (! o->linker_mark)
|
||
{
|
||
/* This section was omitted from the link. */
|
||
continue;
|
||
}
|
||
|
||
if ((o->flags & SEC_HAS_CONTENTS) == 0
|
||
|| (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
|
||
continue;
|
||
|
||
if ((o->flags & SEC_LINKER_CREATED) != 0)
|
||
{
|
||
/* Section was created by elf_link_create_dynamic_sections
|
||
or somesuch. */
|
||
continue;
|
||
}
|
||
|
||
/* Get the contents of the section. They have been cached by a
|
||
relaxation routine. Note that o is a section in an input
|
||
file, so the contents field will not have been set by any of
|
||
the routines which work on output files. */
|
||
if (elf_section_data (o)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (o)->this_hdr.contents;
|
||
else
|
||
{
|
||
contents = finfo->contents;
|
||
if (! bfd_get_section_contents (input_bfd, o, contents,
|
||
(file_ptr) 0, o->_raw_size))
|
||
return false;
|
||
}
|
||
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
|
||
/* Get the swapped relocs. */
|
||
internal_relocs = (NAME(_bfd_elf,link_read_relocs)
|
||
(input_bfd, o, finfo->external_relocs,
|
||
finfo->internal_relocs, false));
|
||
if (internal_relocs == NULL
|
||
&& o->reloc_count > 0)
|
||
return false;
|
||
|
||
/* Relocate the section by invoking a back end routine.
|
||
|
||
The back end routine is responsible for adjusting the
|
||
section contents as necessary, and (if using Rela relocs
|
||
and generating a relocateable output file) adjusting the
|
||
reloc addend as necessary.
|
||
|
||
The back end routine does not have to worry about setting
|
||
the reloc address or the reloc symbol index.
|
||
|
||
The back end routine is given a pointer to the swapped in
|
||
internal symbols, and can access the hash table entries
|
||
for the external symbols via elf_sym_hashes (input_bfd).
|
||
|
||
When generating relocateable output, the back end routine
|
||
must handle STB_LOCAL/STT_SECTION symbols specially. The
|
||
output symbol is going to be a section symbol
|
||
corresponding to the output section, which will require
|
||
the addend to be adjusted. */
|
||
|
||
if (! (*relocate_section) (output_bfd, finfo->info,
|
||
input_bfd, o, contents,
|
||
internal_relocs,
|
||
finfo->internal_syms,
|
||
finfo->sections))
|
||
return false;
|
||
|
||
if (finfo->info->relocateable)
|
||
{
|
||
Elf_Internal_Rela *irela;
|
||
Elf_Internal_Rela *irelaend;
|
||
struct elf_link_hash_entry **rel_hash;
|
||
Elf_Internal_Shdr *input_rel_hdr;
|
||
Elf_Internal_Shdr *output_rel_hdr;
|
||
|
||
/* Adjust the reloc addresses and symbol indices. */
|
||
|
||
irela = internal_relocs;
|
||
irelaend = irela + o->reloc_count;
|
||
rel_hash = (elf_section_data (o->output_section)->rel_hashes
|
||
+ o->output_section->reloc_count);
|
||
for (; irela < irelaend; irela++, rel_hash++)
|
||
{
|
||
unsigned long r_symndx;
|
||
Elf_Internal_Sym *isym;
|
||
asection *sec;
|
||
|
||
irela->r_offset += o->output_offset;
|
||
|
||
r_symndx = ELF_R_SYM (irela->r_info);
|
||
|
||
if (r_symndx == 0)
|
||
continue;
|
||
|
||
if (r_symndx >= locsymcount
|
||
|| (elf_bad_symtab (input_bfd)
|
||
&& finfo->sections[r_symndx] == NULL))
|
||
{
|
||
struct elf_link_hash_entry *rh;
|
||
long indx;
|
||
|
||
/* This is a reloc against a global symbol. We
|
||
have not yet output all the local symbols, so
|
||
we do not know the symbol index of any global
|
||
symbol. We set the rel_hash entry for this
|
||
reloc to point to the global hash table entry
|
||
for this symbol. The symbol index is then
|
||
set at the end of elf_bfd_final_link. */
|
||
indx = r_symndx - extsymoff;
|
||
rh = elf_sym_hashes (input_bfd)[indx];
|
||
while (rh->root.type == bfd_link_hash_indirect
|
||
|| rh->root.type == bfd_link_hash_warning)
|
||
rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
|
||
|
||
/* Setting the index to -2 tells
|
||
elf_link_output_extsym that this symbol is
|
||
used by a reloc. */
|
||
BFD_ASSERT (rh->indx < 0);
|
||
rh->indx = -2;
|
||
|
||
*rel_hash = rh;
|
||
|
||
continue;
|
||
}
|
||
|
||
/* This is a reloc against a local symbol. */
|
||
|
||
*rel_hash = NULL;
|
||
isym = finfo->internal_syms + r_symndx;
|
||
sec = finfo->sections[r_symndx];
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
|
||
{
|
||
/* I suppose the backend ought to fill in the
|
||
section of any STT_SECTION symbol against a
|
||
processor specific section. If we have
|
||
discarded a section, the output_section will
|
||
be the absolute section. */
|
||
if (sec != NULL
|
||
&& (bfd_is_abs_section (sec)
|
||
|| (sec->output_section != NULL
|
||
&& bfd_is_abs_section (sec->output_section))))
|
||
r_symndx = 0;
|
||
else if (sec == NULL || sec->owner == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return false;
|
||
}
|
||
else
|
||
{
|
||
r_symndx = sec->output_section->target_index;
|
||
BFD_ASSERT (r_symndx != 0);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (finfo->indices[r_symndx] == -1)
|
||
{
|
||
unsigned long link;
|
||
const char *name;
|
||
asection *osec;
|
||
|
||
if (finfo->info->strip == strip_all)
|
||
{
|
||
/* You can't do ld -r -s. */
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return false;
|
||
}
|
||
|
||
/* This symbol was skipped earlier, but
|
||
since it is needed by a reloc, we
|
||
must output it now. */
|
||
link = symtab_hdr->sh_link;
|
||
name = bfd_elf_string_from_elf_section (input_bfd,
|
||
link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
return false;
|
||
|
||
osec = sec->output_section;
|
||
isym->st_shndx =
|
||
_bfd_elf_section_from_bfd_section (output_bfd,
|
||
osec);
|
||
if (isym->st_shndx == (unsigned short) -1)
|
||
return false;
|
||
|
||
isym->st_value += sec->output_offset;
|
||
if (! finfo->info->relocateable)
|
||
isym->st_value += osec->vma;
|
||
|
||
finfo->indices[r_symndx] = output_bfd->symcount;
|
||
|
||
if (! elf_link_output_sym (finfo, name, isym, sec))
|
||
return false;
|
||
}
|
||
|
||
r_symndx = finfo->indices[r_symndx];
|
||
}
|
||
|
||
irela->r_info = ELF_R_INFO (r_symndx,
|
||
ELF_R_TYPE (irela->r_info));
|
||
}
|
||
|
||
/* Swap out the relocs. */
|
||
input_rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
output_rel_hdr = &elf_section_data (o->output_section)->rel_hdr;
|
||
BFD_ASSERT (output_rel_hdr->sh_entsize
|
||
== input_rel_hdr->sh_entsize);
|
||
irela = internal_relocs;
|
||
irelaend = irela + o->reloc_count;
|
||
if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
|
||
{
|
||
Elf_External_Rel *erel;
|
||
|
||
erel = ((Elf_External_Rel *) output_rel_hdr->contents
|
||
+ o->output_section->reloc_count);
|
||
for (; irela < irelaend; irela++, erel++)
|
||
{
|
||
Elf_Internal_Rel irel;
|
||
|
||
irel.r_offset = irela->r_offset;
|
||
irel.r_info = irela->r_info;
|
||
BFD_ASSERT (irela->r_addend == 0);
|
||
elf_swap_reloc_out (output_bfd, &irel, erel);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
Elf_External_Rela *erela;
|
||
|
||
BFD_ASSERT (input_rel_hdr->sh_entsize
|
||
== sizeof (Elf_External_Rela));
|
||
erela = ((Elf_External_Rela *) output_rel_hdr->contents
|
||
+ o->output_section->reloc_count);
|
||
for (; irela < irelaend; irela++, erela++)
|
||
elf_swap_reloca_out (output_bfd, irela, erela);
|
||
}
|
||
|
||
o->output_section->reloc_count += o->reloc_count;
|
||
}
|
||
}
|
||
|
||
/* Write out the modified section contents. */
|
||
if (elf_section_data (o)->stab_info == NULL)
|
||
{
|
||
if (! (o->flags & SEC_EXCLUDE) &&
|
||
! bfd_set_section_contents (output_bfd, o->output_section,
|
||
contents, o->output_offset,
|
||
(o->_cooked_size != 0
|
||
? o->_cooked_size
|
||
: o->_raw_size)))
|
||
return false;
|
||
}
|
||
else
|
||
{
|
||
if (! (_bfd_write_section_stabs
|
||
(output_bfd, &elf_hash_table (finfo->info)->stab_info,
|
||
o, &elf_section_data (o)->stab_info, contents)))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Generate a reloc when linking an ELF file. This is a reloc
|
||
requested by the linker, and does come from any input file. This
|
||
is used to build constructor and destructor tables when linking
|
||
with -Ur. */
|
||
|
||
static boolean
|
||
elf_reloc_link_order (output_bfd, info, output_section, link_order)
|
||
bfd *output_bfd;
|
||
struct bfd_link_info *info;
|
||
asection *output_section;
|
||
struct bfd_link_order *link_order;
|
||
{
|
||
reloc_howto_type *howto;
|
||
long indx;
|
||
bfd_vma offset;
|
||
bfd_vma addend;
|
||
struct elf_link_hash_entry **rel_hash_ptr;
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
|
||
howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
|
||
if (howto == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return false;
|
||
}
|
||
|
||
addend = link_order->u.reloc.p->addend;
|
||
|
||
/* Figure out the symbol index. */
|
||
rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
|
||
+ output_section->reloc_count);
|
||
if (link_order->type == bfd_section_reloc_link_order)
|
||
{
|
||
indx = link_order->u.reloc.p->u.section->target_index;
|
||
BFD_ASSERT (indx != 0);
|
||
*rel_hash_ptr = NULL;
|
||
}
|
||
else
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
/* Treat a reloc against a defined symbol as though it were
|
||
actually against the section. */
|
||
h = ((struct elf_link_hash_entry *)
|
||
bfd_wrapped_link_hash_lookup (output_bfd, info,
|
||
link_order->u.reloc.p->u.name,
|
||
false, false, true));
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
asection *section;
|
||
|
||
section = h->root.u.def.section;
|
||
indx = section->output_section->target_index;
|
||
*rel_hash_ptr = NULL;
|
||
/* It seems that we ought to add the symbol value to the
|
||
addend here, but in practice it has already been added
|
||
because it was passed to constructor_callback. */
|
||
addend += section->output_section->vma + section->output_offset;
|
||
}
|
||
else if (h != NULL)
|
||
{
|
||
/* Setting the index to -2 tells elf_link_output_extsym that
|
||
this symbol is used by a reloc. */
|
||
h->indx = -2;
|
||
*rel_hash_ptr = h;
|
||
indx = 0;
|
||
}
|
||
else
|
||
{
|
||
if (! ((*info->callbacks->unattached_reloc)
|
||
(info, link_order->u.reloc.p->u.name, (bfd *) NULL,
|
||
(asection *) NULL, (bfd_vma) 0)))
|
||
return false;
|
||
indx = 0;
|
||
}
|
||
}
|
||
|
||
/* If this is an inplace reloc, we must write the addend into the
|
||
object file. */
|
||
if (howto->partial_inplace && addend != 0)
|
||
{
|
||
bfd_size_type size;
|
||
bfd_reloc_status_type rstat;
|
||
bfd_byte *buf;
|
||
boolean ok;
|
||
|
||
size = bfd_get_reloc_size (howto);
|
||
buf = (bfd_byte *) bfd_zmalloc (size);
|
||
if (buf == (bfd_byte *) NULL)
|
||
return false;
|
||
rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
|
||
switch (rstat)
|
||
{
|
||
case bfd_reloc_ok:
|
||
break;
|
||
default:
|
||
case bfd_reloc_outofrange:
|
||
abort ();
|
||
case bfd_reloc_overflow:
|
||
if (! ((*info->callbacks->reloc_overflow)
|
||
(info,
|
||
(link_order->type == bfd_section_reloc_link_order
|
||
? bfd_section_name (output_bfd,
|
||
link_order->u.reloc.p->u.section)
|
||
: link_order->u.reloc.p->u.name),
|
||
howto->name, addend, (bfd *) NULL, (asection *) NULL,
|
||
(bfd_vma) 0)))
|
||
{
|
||
free (buf);
|
||
return false;
|
||
}
|
||
break;
|
||
}
|
||
ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
|
||
(file_ptr) link_order->offset, size);
|
||
free (buf);
|
||
if (! ok)
|
||
return false;
|
||
}
|
||
|
||
/* The address of a reloc is relative to the section in a
|
||
relocateable file, and is a virtual address in an executable
|
||
file. */
|
||
offset = link_order->offset;
|
||
if (! info->relocateable)
|
||
offset += output_section->vma;
|
||
|
||
rel_hdr = &elf_section_data (output_section)->rel_hdr;
|
||
|
||
if (rel_hdr->sh_type == SHT_REL)
|
||
{
|
||
Elf_Internal_Rel irel;
|
||
Elf_External_Rel *erel;
|
||
|
||
irel.r_offset = offset;
|
||
irel.r_info = ELF_R_INFO (indx, howto->type);
|
||
erel = ((Elf_External_Rel *) rel_hdr->contents
|
||
+ output_section->reloc_count);
|
||
elf_swap_reloc_out (output_bfd, &irel, erel);
|
||
}
|
||
else
|
||
{
|
||
Elf_Internal_Rela irela;
|
||
Elf_External_Rela *erela;
|
||
|
||
irela.r_offset = offset;
|
||
irela.r_info = ELF_R_INFO (indx, howto->type);
|
||
irela.r_addend = addend;
|
||
erela = ((Elf_External_Rela *) rel_hdr->contents
|
||
+ output_section->reloc_count);
|
||
elf_swap_reloca_out (output_bfd, &irela, erela);
|
||
}
|
||
|
||
++output_section->reloc_count;
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
/* Allocate a pointer to live in a linker created section. */
|
||
|
||
boolean
|
||
elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
elf_linker_section_t *lsect;
|
||
struct elf_link_hash_entry *h;
|
||
const Elf_Internal_Rela *rel;
|
||
{
|
||
elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
|
||
elf_linker_section_pointers_t *linker_section_ptr;
|
||
unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
|
||
|
||
BFD_ASSERT (lsect != NULL);
|
||
|
||
/* Is this a global symbol? */
|
||
if (h != NULL)
|
||
{
|
||
/* Has this symbol already been allocated, if so, our work is done */
|
||
if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
|
||
rel->r_addend,
|
||
lsect->which))
|
||
return true;
|
||
|
||
ptr_linker_section_ptr = &h->linker_section_pointer;
|
||
/* Make sure this symbol is output as a dynamic symbol. */
|
||
if (h->dynindx == -1)
|
||
{
|
||
if (! elf_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
}
|
||
|
||
if (lsect->rel_section)
|
||
lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
|
||
}
|
||
|
||
else /* Allocation of a pointer to a local symbol */
|
||
{
|
||
elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
|
||
|
||
/* Allocate a table to hold the local symbols if first time */
|
||
if (!ptr)
|
||
{
|
||
unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
|
||
register unsigned int i;
|
||
|
||
ptr = (elf_linker_section_pointers_t **)
|
||
bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
|
||
|
||
if (!ptr)
|
||
return false;
|
||
|
||
elf_local_ptr_offsets (abfd) = ptr;
|
||
for (i = 0; i < num_symbols; i++)
|
||
ptr[i] = (elf_linker_section_pointers_t *)0;
|
||
}
|
||
|
||
/* Has this symbol already been allocated, if so, our work is done */
|
||
if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
|
||
rel->r_addend,
|
||
lsect->which))
|
||
return true;
|
||
|
||
ptr_linker_section_ptr = &ptr[r_symndx];
|
||
|
||
if (info->shared)
|
||
{
|
||
/* If we are generating a shared object, we need to
|
||
output a R_<xxx>_RELATIVE reloc so that the
|
||
dynamic linker can adjust this GOT entry. */
|
||
BFD_ASSERT (lsect->rel_section != NULL);
|
||
lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
|
||
}
|
||
}
|
||
|
||
/* Allocate space for a pointer in the linker section, and allocate a new pointer record
|
||
from internal memory. */
|
||
BFD_ASSERT (ptr_linker_section_ptr != NULL);
|
||
linker_section_ptr = (elf_linker_section_pointers_t *)
|
||
bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
|
||
|
||
if (!linker_section_ptr)
|
||
return false;
|
||
|
||
linker_section_ptr->next = *ptr_linker_section_ptr;
|
||
linker_section_ptr->addend = rel->r_addend;
|
||
linker_section_ptr->which = lsect->which;
|
||
linker_section_ptr->written_address_p = false;
|
||
*ptr_linker_section_ptr = linker_section_ptr;
|
||
|
||
#if 0
|
||
if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
|
||
{
|
||
linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
|
||
lsect->hole_offset += ARCH_SIZE / 8;
|
||
lsect->sym_offset += ARCH_SIZE / 8;
|
||
if (lsect->sym_hash) /* Bump up symbol value if needed */
|
||
{
|
||
lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
|
||
lsect->sym_hash->root.root.string,
|
||
(long)ARCH_SIZE / 8,
|
||
(long)lsect->sym_hash->root.u.def.value);
|
||
#endif
|
||
}
|
||
}
|
||
else
|
||
#endif
|
||
linker_section_ptr->offset = lsect->section->_raw_size;
|
||
|
||
lsect->section->_raw_size += ARCH_SIZE / 8;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
|
||
lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
|
||
#endif
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
#if ARCH_SIZE==64
|
||
#define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
|
||
#endif
|
||
#if ARCH_SIZE==32
|
||
#define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
|
||
#endif
|
||
|
||
/* Fill in the address for a pointer generated in alinker section. */
|
||
|
||
bfd_vma
|
||
elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
|
||
bfd *output_bfd;
|
||
bfd *input_bfd;
|
||
struct bfd_link_info *info;
|
||
elf_linker_section_t *lsect;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma relocation;
|
||
const Elf_Internal_Rela *rel;
|
||
int relative_reloc;
|
||
{
|
||
elf_linker_section_pointers_t *linker_section_ptr;
|
||
|
||
BFD_ASSERT (lsect != NULL);
|
||
|
||
if (h != NULL) /* global symbol */
|
||
{
|
||
linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
|
||
rel->r_addend,
|
||
lsect->which);
|
||
|
||
BFD_ASSERT (linker_section_ptr != NULL);
|
||
|
||
if (! elf_hash_table (info)->dynamic_sections_created
|
||
|| (info->shared
|
||
&& info->symbolic
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
|
||
{
|
||
/* This is actually a static link, or it is a
|
||
-Bsymbolic link and the symbol is defined
|
||
locally. We must initialize this entry in the
|
||
global section.
|
||
|
||
When doing a dynamic link, we create a .rela.<xxx>
|
||
relocation entry to initialize the value. This
|
||
is done in the finish_dynamic_symbol routine. */
|
||
if (!linker_section_ptr->written_address_p)
|
||
{
|
||
linker_section_ptr->written_address_p = true;
|
||
bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
|
||
lsect->section->contents + linker_section_ptr->offset);
|
||
}
|
||
}
|
||
}
|
||
else /* local symbol */
|
||
{
|
||
unsigned long r_symndx = ELF_R_SYM (rel->r_info);
|
||
BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
|
||
BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
|
||
linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
|
||
rel->r_addend,
|
||
lsect->which);
|
||
|
||
BFD_ASSERT (linker_section_ptr != NULL);
|
||
|
||
/* Write out pointer if it hasn't been rewritten out before */
|
||
if (!linker_section_ptr->written_address_p)
|
||
{
|
||
linker_section_ptr->written_address_p = true;
|
||
bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
|
||
lsect->section->contents + linker_section_ptr->offset);
|
||
|
||
if (info->shared)
|
||
{
|
||
asection *srel = lsect->rel_section;
|
||
Elf_Internal_Rela outrel;
|
||
|
||
/* We need to generate a relative reloc for the dynamic linker. */
|
||
if (!srel)
|
||
lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
|
||
lsect->rel_name);
|
||
|
||
BFD_ASSERT (srel != NULL);
|
||
|
||
outrel.r_offset = (lsect->section->output_section->vma
|
||
+ lsect->section->output_offset
|
||
+ linker_section_ptr->offset);
|
||
outrel.r_info = ELF_R_INFO (0, relative_reloc);
|
||
outrel.r_addend = 0;
|
||
elf_swap_reloca_out (output_bfd, &outrel,
|
||
(((Elf_External_Rela *)
|
||
lsect->section->contents)
|
||
+ lsect->section->reloc_count));
|
||
++lsect->section->reloc_count;
|
||
}
|
||
}
|
||
}
|
||
|
||
relocation = (lsect->section->output_offset
|
||
+ linker_section_ptr->offset
|
||
- lsect->hole_offset
|
||
- lsect->sym_offset);
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
|
||
lsect->name, (long)relocation, (long)relocation);
|
||
#endif
|
||
|
||
/* Subtract out the addend, because it will get added back in by the normal
|
||
processing. */
|
||
return relocation - linker_section_ptr->addend;
|
||
}
|
||
|
||
/* Garbage collect unused sections. */
|
||
|
||
static boolean elf_gc_mark
|
||
PARAMS ((struct bfd_link_info *info, asection *sec,
|
||
asection * (*gc_mark_hook)
|
||
PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *, Elf_Internal_Sym *))));
|
||
|
||
static boolean elf_gc_sweep
|
||
PARAMS ((struct bfd_link_info *info,
|
||
boolean (*gc_sweep_hook)
|
||
PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
|
||
const Elf_Internal_Rela *relocs))));
|
||
|
||
static boolean elf_gc_sweep_symbol
|
||
PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
|
||
|
||
static boolean elf_gc_allocate_got_offsets
|
||
PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
|
||
|
||
static boolean elf_gc_propagate_vtable_entries_used
|
||
PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
|
||
|
||
static boolean elf_gc_smash_unused_vtentry_relocs
|
||
PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
|
||
|
||
/* The mark phase of garbage collection. For a given section, mark
|
||
it, and all the sections which define symbols to which it refers. */
|
||
|
||
static boolean
|
||
elf_gc_mark (info, sec, gc_mark_hook)
|
||
struct bfd_link_info *info;
|
||
asection *sec;
|
||
asection * (*gc_mark_hook)
|
||
PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *, Elf_Internal_Sym *));
|
||
{
|
||
boolean ret = true;
|
||
|
||
sec->gc_mark = 1;
|
||
|
||
/* Look through the section relocs. */
|
||
|
||
if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
|
||
{
|
||
Elf_Internal_Rela *relstart, *rel, *relend;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
size_t nlocsyms;
|
||
size_t extsymoff;
|
||
Elf_External_Sym *locsyms, *freesyms = NULL;
|
||
bfd *input_bfd = sec->owner;
|
||
|
||
/* GCFIXME: how to arrange so that relocs and symbols are not
|
||
reread continually? */
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
|
||
/* Read the local symbols. */
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
extsymoff = nlocsyms = symtab_hdr->sh_info;
|
||
if (symtab_hdr->contents)
|
||
locsyms = (Elf_External_Sym *) symtab_hdr->contents;
|
||
else if (nlocsyms == 0)
|
||
locsyms = NULL;
|
||
else
|
||
{
|
||
locsyms = freesyms =
|
||
bfd_malloc (nlocsyms * sizeof (Elf_External_Sym));
|
||
if (freesyms == NULL
|
||
|| bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_read (locsyms, sizeof (Elf_External_Sym),
|
||
nlocsyms, input_bfd)
|
||
!= nlocsyms * sizeof (Elf_External_Sym)))
|
||
{
|
||
ret = false;
|
||
goto out1;
|
||
}
|
||
}
|
||
|
||
/* Read the relocations. */
|
||
relstart = (NAME(_bfd_elf,link_read_relocs)
|
||
(sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
|
||
info->keep_memory));
|
||
if (relstart == NULL)
|
||
{
|
||
ret = false;
|
||
goto out1;
|
||
}
|
||
relend = relstart + sec->reloc_count;
|
||
|
||
for (rel = relstart; rel < relend; rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
asection *rsec;
|
||
struct elf_link_hash_entry *h;
|
||
Elf_Internal_Sym s;
|
||
|
||
r_symndx = ELF_R_SYM (rel->r_info);
|
||
if (r_symndx == 0)
|
||
continue;
|
||
|
||
if (elf_bad_symtab (sec->owner))
|
||
{
|
||
elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
|
||
if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
|
||
rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s);
|
||
else
|
||
{
|
||
h = sym_hashes[r_symndx - extsymoff];
|
||
rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL);
|
||
}
|
||
}
|
||
else if (r_symndx >= nlocsyms)
|
||
{
|
||
h = sym_hashes[r_symndx - extsymoff];
|
||
rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL);
|
||
}
|
||
else
|
||
{
|
||
elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
|
||
rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s);
|
||
}
|
||
|
||
if (rsec && !rsec->gc_mark)
|
||
if (!elf_gc_mark (info, rsec, gc_mark_hook))
|
||
{
|
||
ret = false;
|
||
goto out2;
|
||
}
|
||
}
|
||
|
||
out2:
|
||
if (!info->keep_memory)
|
||
free (relstart);
|
||
out1:
|
||
if (freesyms)
|
||
free (freesyms);
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* The sweep phase of garbage collection. Remove all garbage sections. */
|
||
|
||
static boolean
|
||
elf_gc_sweep (info, gc_sweep_hook)
|
||
struct bfd_link_info *info;
|
||
boolean (*gc_sweep_hook)
|
||
PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
|
||
const Elf_Internal_Rela *relocs));
|
||
{
|
||
bfd *sub;
|
||
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
{
|
||
asection *o;
|
||
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
{
|
||
/* Keep special sections. Keep .debug sections. */
|
||
if ((o->flags & SEC_LINKER_CREATED)
|
||
|| (o->flags & SEC_DEBUGGING))
|
||
o->gc_mark = 1;
|
||
|
||
if (o->gc_mark)
|
||
continue;
|
||
|
||
/* Skip sweeping sections already excluded. */
|
||
if (o->flags & SEC_EXCLUDE)
|
||
continue;
|
||
|
||
/* Since this is early in the link process, it is simple
|
||
to remove a section from the output. */
|
||
o->flags |= SEC_EXCLUDE;
|
||
|
||
/* But we also have to update some of the relocation
|
||
info we collected before. */
|
||
if (gc_sweep_hook
|
||
&& (o->flags & SEC_RELOC) && o->reloc_count > 0)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
boolean r;
|
||
|
||
internal_relocs = (NAME(_bfd_elf,link_read_relocs)
|
||
(o->owner, o, NULL, NULL, info->keep_memory));
|
||
if (internal_relocs == NULL)
|
||
return false;
|
||
|
||
r = (*gc_sweep_hook)(o->owner, info, o, internal_relocs);
|
||
|
||
if (!info->keep_memory)
|
||
free (internal_relocs);
|
||
|
||
if (!r)
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Remove the symbols that were in the swept sections from the dynamic
|
||
symbol table. GCFIXME: Anyone know how to get them out of the
|
||
static symbol table as well? */
|
||
{
|
||
int i = 0;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_sweep_symbol,
|
||
(PTR) &i);
|
||
|
||
elf_hash_table (info)->dynsymcount = i;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
|
||
|
||
static boolean
|
||
elf_gc_sweep_symbol (h, idxptr)
|
||
struct elf_link_hash_entry *h;
|
||
PTR idxptr;
|
||
{
|
||
int *idx = (int *) idxptr;
|
||
|
||
if (h->dynindx != -1
|
||
&& ((h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
|| h->root.u.def.section->gc_mark))
|
||
h->dynindx = (*idx)++;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Propogate collected vtable information. This is called through
|
||
elf_link_hash_traverse. */
|
||
|
||
static boolean
|
||
elf_gc_propagate_vtable_entries_used (h, okp)
|
||
struct elf_link_hash_entry *h;
|
||
PTR okp;
|
||
{
|
||
/* Those that are not vtables. */
|
||
if (h->vtable_parent == NULL)
|
||
return true;
|
||
|
||
/* Those vtables that do not have parents, we cannot merge. */
|
||
if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
|
||
return true;
|
||
|
||
/* If we've already been done, exit. */
|
||
if (h->vtable_entries_used && h->vtable_entries_used[-1])
|
||
return true;
|
||
|
||
/* Make sure the parent's table is up to date. */
|
||
elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
|
||
|
||
if (h->vtable_entries_used == NULL)
|
||
{
|
||
/* None of this table's entries were referenced. Re-use the
|
||
parent's table. */
|
||
h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
|
||
}
|
||
else
|
||
{
|
||
size_t n;
|
||
boolean *cu, *pu;
|
||
|
||
/* Or the parent's entries into ours. */
|
||
cu = h->vtable_entries_used;
|
||
cu[-1] = true;
|
||
pu = h->vtable_parent->vtable_entries_used;
|
||
if (pu != NULL)
|
||
{
|
||
n = h->vtable_parent->size / FILE_ALIGN;
|
||
while (--n != 0)
|
||
{
|
||
if (*pu) *cu = true;
|
||
pu++, cu++;
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
static boolean
|
||
elf_gc_smash_unused_vtentry_relocs (h, okp)
|
||
struct elf_link_hash_entry *h;
|
||
PTR okp;
|
||
{
|
||
asection *sec;
|
||
bfd_vma hstart, hend;
|
||
Elf_Internal_Rela *relstart, *relend, *rel;
|
||
|
||
/* Take care of both those symbols that do not describe vtables as
|
||
well as those that are not loaded. */
|
||
if (h->vtable_parent == NULL)
|
||
return true;
|
||
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak);
|
||
|
||
sec = h->root.u.def.section;
|
||
hstart = h->root.u.def.value;
|
||
hend = hstart + h->size;
|
||
|
||
relstart = (NAME(_bfd_elf,link_read_relocs)
|
||
(sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
|
||
if (!relstart)
|
||
return *(boolean *)okp = false;
|
||
relend = relstart + sec->reloc_count;
|
||
|
||
for (rel = relstart; rel < relend; ++rel)
|
||
if (rel->r_offset >= hstart && rel->r_offset < hend)
|
||
{
|
||
/* If the entry is in use, do nothing. */
|
||
if (h->vtable_entries_used)
|
||
{
|
||
bfd_vma entry = (rel->r_offset - hstart) / FILE_ALIGN;
|
||
if (h->vtable_entries_used[entry])
|
||
continue;
|
||
}
|
||
/* Otherwise, kill it. */
|
||
rel->r_offset = rel->r_info = rel->r_addend = 0;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Do mark and sweep of unused sections. */
|
||
|
||
boolean
|
||
elf_gc_sections (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
boolean ok = true;
|
||
bfd *sub;
|
||
asection * (*gc_mark_hook)
|
||
PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *h, Elf_Internal_Sym *));
|
||
|
||
if (!get_elf_backend_data (abfd)->can_gc_sections
|
||
|| info->relocateable
|
||
|| elf_hash_table (info)->dynamic_sections_created)
|
||
return true;
|
||
|
||
/* Apply transitive closure to the vtable entry usage info. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_propagate_vtable_entries_used,
|
||
(PTR) &ok);
|
||
if (!ok)
|
||
return false;
|
||
|
||
/* Kill the vtable relocations that were not used. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_smash_unused_vtentry_relocs,
|
||
(PTR) &ok);
|
||
if (!ok)
|
||
return false;
|
||
|
||
/* Grovel through relocs to find out who stays ... */
|
||
|
||
gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
{
|
||
asection *o;
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
{
|
||
if (o->flags & SEC_KEEP)
|
||
if (!elf_gc_mark (info, o, gc_mark_hook))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/* ... and mark SEC_EXCLUDE for those that go. */
|
||
if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Called from check_relocs to record the existance of a VTINHERIT reloc. */
|
||
|
||
boolean
|
||
elf_gc_record_vtinherit (abfd, sec, h, offset)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma offset;
|
||
{
|
||
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
|
||
struct elf_link_hash_entry **search, *child;
|
||
bfd_size_type extsymcount;
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols at
|
||
this point. */
|
||
extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
|
||
if (!elf_bad_symtab (abfd))
|
||
extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
|
||
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
sym_hashes_end = sym_hashes + extsymcount;
|
||
|
||
/* Hunt down the child symbol, which is in this section at the same
|
||
offset as the relocation. */
|
||
for (search = sym_hashes; search != sym_hashes_end; ++search)
|
||
{
|
||
if ((child = *search) != NULL
|
||
&& (child->root.type == bfd_link_hash_defined
|
||
|| child->root.type == bfd_link_hash_defweak)
|
||
&& child->root.u.def.section == sec
|
||
&& child->root.u.def.value == offset)
|
||
goto win;
|
||
}
|
||
|
||
(*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
|
||
bfd_get_filename (abfd), sec->name,
|
||
(unsigned long)offset);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return false;
|
||
|
||
win:
|
||
if (!h)
|
||
{
|
||
/* This *should* only be the absolute section. It could potentially
|
||
be that someone has defined a non-global vtable though, which
|
||
would be bad. It isn't worth paging in the local symbols to be
|
||
sure though; that case should simply be handled by the assembler. */
|
||
|
||
child->vtable_parent = (struct elf_link_hash_entry *) -1;
|
||
}
|
||
else
|
||
child->vtable_parent = h;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Called from check_relocs to record the existance of a VTENTRY reloc. */
|
||
|
||
boolean
|
||
elf_gc_record_vtentry (abfd, sec, h, addend)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma addend;
|
||
{
|
||
if (h->vtable_entries_used == NULL)
|
||
{
|
||
/* Allocate one extra entry for use as a "done" flag for the
|
||
consolidation pass. */
|
||
size_t size = (h->size / FILE_ALIGN + 1) * sizeof(boolean);
|
||
h->vtable_entries_used = (boolean *) bfd_alloc (abfd, size);
|
||
if (h->vtable_entries_used == NULL)
|
||
return false;
|
||
|
||
/* And arrange for that done flag to be at index -1. */
|
||
memset (h->vtable_entries_used++, 0, size);
|
||
}
|
||
h->vtable_entries_used[addend / FILE_ALIGN] = true;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* And an accompanying bit to work out final got entry offsets once
|
||
we're done. Should be called from final_link. */
|
||
|
||
boolean
|
||
elf_gc_common_finalize_got_offsets (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
bfd *i;
|
||
struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_vma gotoff;
|
||
|
||
/* The GOT offset is relative to the .got section, but the GOT header is
|
||
put into the .got.plt section, if the backend uses it. */
|
||
if (bed->want_got_plt)
|
||
gotoff = 0;
|
||
else
|
||
gotoff = bed->got_header_size;
|
||
|
||
/* Do the local .got entries first. */
|
||
for (i = info->input_bfds; i; i = i->link_next)
|
||
{
|
||
bfd_signed_vma *local_got = elf_local_got_refcounts (i);
|
||
bfd_size_type j, locsymcount;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
|
||
if (!local_got)
|
||
continue;
|
||
|
||
symtab_hdr = &elf_tdata (i)->symtab_hdr;
|
||
if (elf_bad_symtab (i))
|
||
locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
else
|
||
locsymcount = symtab_hdr->sh_info;
|
||
|
||
for (j = 0; j < locsymcount; ++j)
|
||
{
|
||
if (local_got[j] > 0)
|
||
{
|
||
local_got[j] = gotoff;
|
||
gotoff += ARCH_SIZE / 8;
|
||
}
|
||
else
|
||
local_got[j] = (bfd_vma) -1;
|
||
}
|
||
}
|
||
|
||
/* Then the global .got and .plt entries. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_allocate_got_offsets,
|
||
(PTR) &gotoff);
|
||
return true;
|
||
}
|
||
|
||
/* We need a special top-level link routine to convert got reference counts
|
||
to real got offsets. */
|
||
|
||
static boolean
|
||
elf_gc_allocate_got_offsets (h, offarg)
|
||
struct elf_link_hash_entry *h;
|
||
PTR offarg;
|
||
{
|
||
bfd_vma *off = (bfd_vma *) offarg;
|
||
|
||
if (h->got.refcount > 0)
|
||
{
|
||
h->got.offset = off[0];
|
||
off[0] += ARCH_SIZE / 8;
|
||
}
|
||
else
|
||
h->got.offset = (bfd_vma) -1;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Many folk need no more in the way of final link than this, once
|
||
got entry reference counting is enabled. */
|
||
|
||
boolean
|
||
elf_gc_common_final_link (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
if (!elf_gc_common_finalize_got_offsets (abfd, info))
|
||
return false;
|
||
|
||
/* Invoke the regular ELF backend linker to do all the work. */
|
||
return elf_bfd_final_link (abfd, info);
|
||
}
|
||
|
||
/* This function will be called though elf_link_hash_traverse to store
|
||
all hash value of the exported symbols in an array. */
|
||
|
||
static boolean
|
||
elf_collect_hash_codes (h, data)
|
||
struct elf_link_hash_entry *h;
|
||
PTR data;
|
||
{
|
||
unsigned long **valuep = (unsigned long **) data;
|
||
const char *name;
|
||
char *p;
|
||
unsigned long ha;
|
||
char *alc = NULL;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->dynindx == -1)
|
||
return true;
|
||
|
||
name = h->root.root.string;
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL)
|
||
{
|
||
alc = bfd_malloc (p - name + 1);
|
||
memcpy (alc, name, p - name);
|
||
alc[p - name] = '\0';
|
||
name = alc;
|
||
}
|
||
|
||
/* Compute the hash value. */
|
||
ha = bfd_elf_hash (name);
|
||
|
||
/* Store the found hash value in the array given as the argument. */
|
||
*(*valuep)++ = ha;
|
||
|
||
/* And store it in the struct so that we can put it in the hash table
|
||
later. */
|
||
h->elf_hash_value = ha;
|
||
|
||
if (alc != NULL)
|
||
free (alc);
|
||
|
||
return true;
|
||
}
|