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Fix the ELF linker to not require an interpreter if no dynamic 

objects were seen, even when linking PIC code.
	* libelf.h (ELF_LINK_HASH_NEEDS_PLT): Define.
	(struct elf_link_hash_table): Add field dynamic_sections_created.
	* elfcode.h (elf_link_record_dynamic_symbol): Create dynstr if it
	doesn't already exist.
	(elf_link_add_object_symbols): Create dynamic sections based on
	dynamic_sections_created field, not dynobj field.  Don't bother to
	set dynobj.
	(elf_link_create_dynamic_sections): If dynamic sections were
	already created, don't do anything.  If dynobj is already set, use
	it; otherwise, set it to the bfd argument.  Don't initialize
	dynsymcount.  Only create dynstr if it does not exist.  Set
	dynamic_sections_created to true.
	(NAME(bfd_elf,size_dynamic_sections)): Skip most of this function
	if no dynamic objects were seen.
	(elf_adjust_dynamic_symbol): If a symbol has the
	ELF_LINK_HASH_NEEDS_PLT flag set, let the backend adjust it.
	(elf_bfd_final_link): Change most decisions based on dynobj to
	check dynamic_sections_created instead.
	(elf_link_output_extsym): Only handle dynamic symbols if a dynamic
	object was seen.
	* elf.c (_bfd_elf_link_hash_table_init): Initialize new field
	dynamic_sections_created.  Set dynsymcount to 1, not 0.
	* elf32-i386.c (elf_i386_create_dynamic_sections): Call
	elf_i386_create_got_section rather than creating the .got and
	.got.plt sections.
	(elf_i386_create_got_section): New static function.
	(elf_i386_check_relocs): Just call elf_i386_create_got_section if
	a GOT table is needed, not bfd_elf32_link_create_dynamic_sections.
	Only create the .rel.got section, and only make space for a reloc,
	for a global symbol or when generating a shared object.  For a
	R_386_PLT32 reloc, just set the	ELF_LINK_HASH_NEEDS_PLT flag.
	(elf_i386_adjust_dynamic_symbol): Rework initial assertion to
	permit ELF_LINK_HASH_NEEDS_PLT non dynamic symbols.  Create a
	procedure linkage table entry for such symbols.  But, if no
	dynamic objects were seen, never create a PLT entry.
	(elf_i386_size_dynamic_sections): If no dynamic objects were seen,
	skip most of this function, and force the size of the .rel.got
	section to zero.
	(elf_i386_relocate_section): For a R_386_GOT32 reloc against a global
	symbol when no dynamic object was seen, initialize the contents of
	the .got section.  For a R_386_GOT32 against a local symbol, only
	create a R_386_RELATIVE reloc when generating a shared object.
	Treat a R_386_PLT32 reloc against a symbol for which we did not
	create a PLT entry as a R_386_PC32 reloc.
	(elf_i386_finish_dynamic_sections): Only fiddle with the dynamic
	entries and the PLT if we saw a dynamic object.
	* elf32-sparc.c (elf_sparc_howto_table): Fix R_SPARC_PC22 by
	setting rightshift to 10.  Fix R_SPARC_WPLT20 by setting
	rightshift to 2, size to 2, bitsize to 30, and dst_mask to
	0x3fffffff.
	(elf32_sparc_create_dynamic_sections): Don't set the size of the
	.plt section.  Call elf32_sparc_create_got_section rather than
	creating the .got section.
	(elf32_sparc_check_relocs): Call elf32_sparc_create_got_section if
	a GOT table is needed, not bfd_elf32_link_create_dynamic_sections.
	Only create the .rela.got section, and only make space for a
	reloc, for a global symbol or when generating a shared object.
	Set the alignment of the .rela.got section to 2.  For a
	R_SPARC_WPLT30 reloc, just set the ELF_LINK_HASH_NEEDS_PLT flag.
	(elf32_sparc_adjust_dynamic_symbol): Rework initial assertion to
	permit ELF_LINK_HASH_NEDS_PLT non dynamic symbols.  Create a
	procedure linkage table for such symbols.  But, if no dynamic
	objects were seen, never create a PLT entry.  Initialize the size
	of the .plt section.
	(elf32_sparc_size_dynamic_sections): If no dynamic objects were
	seen, skip most of this function, and force the size of the
	.rela.got section to zero.  Strip empty reloc sections, and strip
	an empty .plt section.
	(elf32_sparc_relocate_section): For a GOT reloc against a global
	symbol when no dynamic object was seen, initialize the contents of
	the .got section.  For a GOT reloc against a local symbol, only
	create a R_SPARC_RELATIVE reloc when generating a shared object.
	Treat a R_SPARC_WPLT30 reloc against a symbol for which we did not
	create a PLT entry as a R_SPARC_WDISP30 reloc.
	(elf32_sparc_finish_dynamic_sections): Only fiddle with the
	dynamic entries and the PLT if we saw a dynamic object.
This commit is contained in:
Ian Lance Taylor 1994-10-21 22:00:18 +00:00
parent 6b55e5e3b9
commit 12662be4fe
5 changed files with 944 additions and 610 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
bfd/ChangeLog
View File

@ -1,3 +1,84 @@
Fri Oct 21 17:13:07 1994 Ian Lance Taylor <ian@sanguine.cygnus.com>
Fix the ELF linker to not require an interpreter if no dynamic
objects were seen, even when linking PIC code.
* libelf.h (ELF_LINK_HASH_NEEDS_PLT): Define.
(struct elf_link_hash_table): Add field dynamic_sections_created.
* elfcode.h (elf_link_record_dynamic_symbol): Create dynstr if it
doesn't already exist.
(elf_link_add_object_symbols): Create dynamic sections based on
dynamic_sections_created field, not dynobj field. Don't bother to
set dynobj.
(elf_link_create_dynamic_sections): If dynamic sections were
already created, don't do anything. If dynobj is already set, use
it; otherwise, set it to the bfd argument. Don't initialize
dynsymcount. Only create dynstr if it does not exist. Set
dynamic_sections_created to true.
(NAME(bfd_elf,size_dynamic_sections)): Skip most of this function
if no dynamic objects were seen.
(elf_adjust_dynamic_symbol): If a symbol has the
ELF_LINK_HASH_NEEDS_PLT flag set, let the backend adjust it.
(elf_bfd_final_link): Change most decisions based on dynobj to
check dynamic_sections_created instead.
(elf_link_output_extsym): Only handle dynamic symbols if a dynamic
object was seen.
* elf.c (_bfd_elf_link_hash_table_init): Initialize new field
dynamic_sections_created. Set dynsymcount to 1, not 0.
* elf32-i386.c (elf_i386_create_dynamic_sections): Call
elf_i386_create_got_section rather than creating the .got and
.got.plt sections.
(elf_i386_create_got_section): New static function.
(elf_i386_check_relocs): Just call elf_i386_create_got_section if
a GOT table is needed, not bfd_elf32_link_create_dynamic_sections.
Only create the .rel.got section, and only make space for a reloc,
for a global symbol or when generating a shared object. For a
R_386_PLT32 reloc, just set the ELF_LINK_HASH_NEEDS_PLT flag.
(elf_i386_adjust_dynamic_symbol): Rework initial assertion to
permit ELF_LINK_HASH_NEEDS_PLT non dynamic symbols. Create a
procedure linkage table entry for such symbols. But, if no
dynamic objects were seen, never create a PLT entry.
(elf_i386_size_dynamic_sections): If no dynamic objects were seen,
skip most of this function, and force the size of the .rel.got
section to zero.
(elf_i386_relocate_section): For a R_386_GOT32 reloc against a global
symbol when no dynamic object was seen, initialize the contents of
the .got section. For a R_386_GOT32 against a local symbol, only
create a R_386_RELATIVE reloc when generating a shared object.
Treat a R_386_PLT32 reloc against a symbol for which we did not
create a PLT entry as a R_386_PC32 reloc.
(elf_i386_finish_dynamic_sections): Only fiddle with the dynamic
entries and the PLT if we saw a dynamic object.
* elf32-sparc.c (elf_sparc_howto_table): Fix R_SPARC_PC22 by
setting rightshift to 10. Fix R_SPARC_WPLT20 by setting
rightshift to 2, size to 2, bitsize to 30, and dst_mask to
0x3fffffff.
(elf32_sparc_create_dynamic_sections): Don't set the size of the
.plt section. Call elf32_sparc_create_got_section rather than
creating the .got section.
(elf32_sparc_check_relocs): Call elf32_sparc_create_got_section if
a GOT table is needed, not bfd_elf32_link_create_dynamic_sections.
Only create the .rela.got section, and only make space for a
reloc, for a global symbol or when generating a shared object.
Set the alignment of the .rela.got section to 2. For a
R_SPARC_WPLT30 reloc, just set the ELF_LINK_HASH_NEEDS_PLT flag.
(elf32_sparc_adjust_dynamic_symbol): Rework initial assertion to
permit ELF_LINK_HASH_NEDS_PLT non dynamic symbols. Create a
procedure linkage table for such symbols. But, if no dynamic
objects were seen, never create a PLT entry. Initialize the size
of the .plt section.
(elf32_sparc_size_dynamic_sections): If no dynamic objects were
seen, skip most of this function, and force the size of the
.rela.got section to zero. Strip empty reloc sections, and strip
an empty .plt section.
(elf32_sparc_relocate_section): For a GOT reloc against a global
symbol when no dynamic object was seen, initialize the contents of
the .got section. For a GOT reloc against a local symbol, only
create a R_SPARC_RELATIVE reloc when generating a shared object.
Treat a R_SPARC_WPLT30 reloc against a symbol for which we did not
create a PLT entry as a R_SPARC_WDISP30 reloc.
(elf32_sparc_finish_dynamic_sections): Only fiddle with the
dynamic entries and the PLT if we saw a dynamic object.
Thu Oct 20 13:28:45 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* elfcode.h (elf_map_symbols): Don't worry about section symbols

555
bfd/elf32-i386.c
View File

@ -31,6 +31,8 @@ static void elf_i386_info_to_howto_rel
PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static boolean elf_i386_create_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_i386_create_got_section
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_i386_check_relocs
PARAMS ((bfd *, struct bfd_link_info *, asection *,
const Elf_Internal_Rela *));
@ -269,39 +271,9 @@ elf_i386_create_dynamic_sections (abfd, info)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
s = bfd_make_section (abfd, ".got");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags)
|| ! bfd_set_section_alignment (abfd, s, 2))
if (! elf_i386_create_got_section (abfd, info))
return false;
s = bfd_make_section (abfd, ".got.plt");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
/* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the
.got.plt section, which will be placed at the start of the output
.got section. We don't do this in the linker script because we
don't want to define the symbol if we are not creating a global
offset table. */
h = NULL;
if (! (_bfd_generic_link_add_one_symbol
(info, abfd, "_GLOBAL_OFFSET_TABLE_", 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_elf32_link_record_dynamic_symbol (info, h))
return false;
/* The first three global offset table entries are reserved. */
s->_raw_size += 3 * 4;
/* The .dynbss section is a place to put symbols which are defined
by dynamic objects, are referenced by regular objects, and are
not functions. We must allocate space for them in the process
@ -336,6 +308,61 @@ elf_i386_create_dynamic_sections (abfd, info)
return true;
}
/* Create the .got section to hold the global offset table, and the
.got.plt section to hold procedure linkage table GOT entries. The
linker script will put .got.plt into the output .got section. */
static boolean
elf_i386_create_got_section (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
flagword flags;
register asection *s;
struct elf_link_hash_entry *h;
/* This function may be called more than once. */
if (bfd_get_section_by_name (abfd, ".got") != NULL)
return true;
flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
s = bfd_make_section (abfd, ".got");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
s = bfd_make_section (abfd, ".got.plt");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
/* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the
.got.plt section, which will be placed at the start of the output
.got section. We don't do this in the linker script because we
don't want to define the symbol if we are not creating a global
offset table. */
h = NULL;
if (! (_bfd_generic_link_add_one_symbol
(info, abfd, "_GLOBAL_OFFSET_TABLE_", 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_elf32_link_record_dynamic_symbol (info, h))
return false;
/* The first three global offset table entries are reserved. */
s->_raw_size += 3 * 4;
return true;
}
/* Look through the relocs for a section during the first phase, and
allocate space in the global offset table or procedure linkage
table. */
@ -355,9 +382,6 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
const Elf_Internal_Rela *rel_end;
asection *sgot;
asection *srelgot;
asection *splt;
asection *sgotplt;
asection *srelplt;
asection *sreloc;
if (info->relocateable)
@ -370,9 +394,6 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
sgot = NULL;
srelgot = NULL;
splt = NULL;
sgotplt = NULL;
srelplt = NULL;
sreloc = NULL;
rel_end = relocs + sec->reloc_count;
@ -388,20 +409,16 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
else
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
/* Some relocs require a global offset table. FIXME: If this is
a static link of PIC code, we need a global offset table but
we don't really need to create the full dynamic linking
information. */
/* Some relocs require a global offset table. */
if (dynobj == NULL)
{
switch (ELF32_R_TYPE (rel->r_info))
{
case R_386_GOT32:
case R_386_PLT32:
case R_386_GOTOFF:
case R_386_GOTPC:
elf_hash_table (info)->dynobj = dynobj = abfd;
if (! bfd_elf32_link_create_dynamic_sections (dynobj, info))
if (! elf_i386_create_got_section (dynobj, info))
return false;
break;
@ -418,6 +435,12 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
if (sgot == NULL)
{
sgot = bfd_get_section_by_name (dynobj, ".got");
BFD_ASSERT (sgot != NULL);
}
if (srelgot == NULL
&& (h != NULL || info->shared))
{
srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
if (srelgot == NULL)
{
@ -432,7 +455,6 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
return false;
}
BFD_ASSERT (sgot != NULL && srelgot != NULL);
}
if (h != NULL)
@ -450,6 +472,8 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
return false;
}
srelgot->_raw_size += sizeof (Elf32_External_Rel);
}
else
{
@ -477,41 +501,32 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
break;
}
local_got_offsets[r_symndx] = sgot->_raw_size;
if (info->shared)
{
/* If we are generating a shared object, we need to
output a R_386_RELATIVE reloc so that the dynamic
linker can adjust this GOT entry. */
srelgot->_raw_size += sizeof (Elf32_External_Rel);
}
}
sgot->_raw_size += 4;
srelgot->_raw_size += sizeof (Elf32_External_Rel);
break;
case R_386_PLT32:
/* This symbol requires a procedure linkage table entry. */
/* This symbol requires a procedure linkage table entry. We
actually build the entry in adjust_dynamic_symbol,
because this might be a case of linking PIC code without
linking in any dynamic objects, in which case we don't
need to generate a procedure linkage table after all. */
/* If this is a local symbol, we resolve it directly without
creating a procedure linkage table entry. */
if (h == NULL)
continue;
if (h->plt_offset != (bfd_vma) -1)
{
/* There is already an entry for this symbol in the
procedure linkage table. */
break;
}
if (splt == NULL)
{
splt = bfd_get_section_by_name (dynobj, ".plt");
sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
BFD_ASSERT (splt != NULL && sgotplt != NULL && srelplt != NULL);
}
/* If this is the first .plt entry, make room for the
special first entry. */
if (splt->_raw_size == 0)
splt->_raw_size += PLT_ENTRY_SIZE;
/* Make sure this symbol is output as a dynamic symbol. */
if (h->dynindx == -1)
{
@ -519,15 +534,7 @@ elf_i386_check_relocs (abfd, info, sec, relocs)
return false;
}
h->plt_offset = splt->_raw_size;
/* Make room for this entry. We need a procedure linkage
table entry in .plt, a global offset table entry in
.got.plt (which is placed in .got by the linker script),
and a relocation in .rel.plt. */
splt->_raw_size += PLT_ENTRY_SIZE;
sgotplt->_raw_size += 4;
srelplt->_raw_size += sizeof (Elf32_External_Rel);
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
break;
@ -602,59 +609,66 @@ elf_i386_adjust_dynamic_symbol (info, h)
/* Make sure we know what is going on here. */
BFD_ASSERT (dynobj != NULL
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
&& h->root.type == bfd_link_hash_defined
&& (bfd_get_flavour (h->root.u.def.section->owner)
== bfd_target_elf_flavour)
&& (elf_elfheader (h->root.u.def.section->owner)->e_type
== ET_DYN)
&& h->root.u.def.section->output_section == NULL);
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
|| ((h->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC) != 0
&& (h->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR) != 0
&& (h->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR) == 0
&& (elf_elfheader (h->root.u.def.section->owner)->e_type
== ET_DYN)
&& h->root.u.def.section->output_section == NULL)));
/* If this is a function, put it in the procedure linkage table. We
will fill in the contents of the procedure linkage table later,
when we know the address of the .got section. */
if (h->type == STT_FUNC)
if (h->type == STT_FUNC
|| (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
{
if (! elf_hash_table (info)->dynamic_sections_created)
{
/* This case can occur if we saw a PLT32 reloc in an input
file, but none of the input files were dynamic objects.
In such a case, we don't actually need to build a
procedure linkage table, and we can just do a PC32 reloc
instead. */
BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
return true;
}
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
if (h->plt_offset != (bfd_vma) -1)
{
h->root.u.def.section = s;
h->root.u.def.value = h->plt_offset;
}
else
{
/* If this is the first .plt entry, make room for the
special first entry. */
if (s->_raw_size == 0)
s->_raw_size += PLT_ENTRY_SIZE;
/* If this is the first .plt entry, make room for the special
first entry. */
if (s->_raw_size == 0)
s->_raw_size += PLT_ENTRY_SIZE;
/* Set the symbol to this location in the .plt. */
h->root.u.def.section = s;
h->root.u.def.value = s->_raw_size;
/* Set the symbol to this location in the .plt. */
h->root.u.def.section = s;
h->root.u.def.value = s->_raw_size;
h->plt_offset = s->_raw_size;
h->plt_offset = s->_raw_size;
/* Make room for this entry. */
s->_raw_size += PLT_ENTRY_SIZE;
/* Make room for this entry. */
s->_raw_size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .got.plt section,
which will be placed in the .got section by the linker
script. */
/* We also need to make an entry in the .got.plt section, which
will be placed in the .got section by the linker script. */
s = bfd_get_section_by_name (dynobj, ".got.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += 4;
s = bfd_get_section_by_name (dynobj, ".got.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += 4;
/* We also need to make an entry in the .rel.plt section. */
/* We also need to make an entry in the .rel.plt section. */
s = bfd_get_section_by_name (dynobj, ".rel.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += sizeof (Elf32_External_Rel);
}
s = bfd_get_section_by_name (dynobj, ".rel.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += sizeof (Elf32_External_Rel);
return true;
}
@ -751,13 +765,27 @@ elf_i386_size_dynamic_sections (output_bfd, info)
dynobj = elf_hash_table (info)->dynobj;
BFD_ASSERT (dynobj != NULL);
/* Set the contents of the .interp section to the interpreter. */
if (! info->shared)
if (elf_hash_table (info)->dynamic_sections_created)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
/* Set the contents of the .interp section to the interpreter. */
if (! info->shared)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
}
}
else
{
/* We may have created entries in the .rel.got section.
However, if we are not creating the dynamic sections, we will
not actually use these entries. Reset the size of .rel.got,
which will cause it to get stripped from the output file
below. */
s = bfd_get_section_by_name (dynobj, ".rel.got");
if (s != NULL)
s->_raw_size = 0;
}
/* The check_relocs and adjust_dynamic_symbol entry points have
@ -859,39 +887,42 @@ elf_i386_size_dynamic_sections (output_bfd, info)
}
}
/* Add some entries to the .dynamic section. We fill in the values
later, in elf_i386_finish_dynamic_sections, but we must add the
entries now so that we get the correct size for the .dynamic
section. The DT_DEBUG entry is filled in by the dynamic linker
and used by the debugger. */
if (! info->shared)
if (elf_hash_table (info)->dynamic_sections_created)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
return false;
}
/* Add some entries to the .dynamic section. We fill in the
values later, in elf_i386_finish_dynamic_sections, but we
must add the entries now so that we get the correct size for
the .dynamic section. The DT_DEBUG entry is filled in by the
dynamic linker and used by the debugger. */
if (! info->shared)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
return false;
}
if (plt)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL)
|| ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
return false;
}
if (plt)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL)
|| ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
return false;
}
if (relocs)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELENT,
sizeof (Elf32_External_Rel)))
return false;
}
if (relocs)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELENT,
sizeof (Elf32_External_Rel)))
return false;
}
if (reltext)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
return false;
if (reltext)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
return false;
}
}
return true;
@ -910,7 +941,6 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
Elf_Internal_Rela *relocs;
Elf_Internal_Sym *local_syms;
asection **local_sections;
char *output_names;
{
bfd *dynobj;
Elf_Internal_Shdr *symtab_hdr;
@ -1026,8 +1056,33 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
if (h != NULL)
{
BFD_ASSERT (h->got_offset != (bfd_vma) -1);
relocation = sgot->output_offset + h->got_offset;
bfd_vma off;
off = h->got_offset;
BFD_ASSERT (off != (bfd_vma) -1);
if (! elf_hash_table (info)->dynamic_sections_created)
{
/* This is actually a static link. We must
initialize this entry in the global offset table.
Since the offset must always be a multiple of 4,
we use the least significant bit to record
whether we have initialized it already.
When doing a dynamic link, we create a .rel.got
relocation entry to initialize the value. This
is done in the finish_dynamic_symbol routine. */
if ((off & 1) != 0)
off &= ~1;
else
{
bfd_put_32 (output_bfd, relocation,
sgot->contents + off);
h->got_offset |= 1;
}
}
relocation = sgot->output_offset + off;
}
else
{
@ -1045,23 +1100,26 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
off &= ~1;
else
{
asection *srelgot;
Elf_Internal_Rel outrel;
bfd_put_32 (output_bfd, relocation, sgot->contents + off);
srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
BFD_ASSERT (srelgot != NULL);
if (info->shared)
{
asection *srelgot;
Elf_Internal_Rel outrel;
outrel.r_offset = (sgot->output_section->vma
+ sgot->output_offset
+ off);
outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
bfd_elf32_swap_reloc_out (output_bfd, &outrel,
(((Elf32_External_Rel *)
srelgot->contents)
+ srelgot->reloc_count));
++srelgot->reloc_count;
srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
BFD_ASSERT (srelgot != NULL);
outrel.r_offset = (sgot->output_section->vma
+ sgot->output_offset
+ off);
outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
bfd_elf32_swap_reloc_out (output_bfd, &outrel,
(((Elf32_External_Rel *)
srelgot->contents)
+ srelgot->reloc_count));
++srelgot->reloc_count;
}
local_got_offsets[r_symndx] |= 1;
}
@ -1112,13 +1170,19 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
if (h == NULL)
break;
if (h->plt_offset == (bfd_vma) -1)
{
/* We didn't make a PLT entry for this symbol. This
happens when statically linking PIC code. */
break;
}
if (splt == NULL)
{
splt = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (splt != NULL);
}
BFD_ASSERT (h != NULL && h->plt_offset != (bfd_vma) -1);
relocation = (splt->output_section->vma
+ splt->output_offset
+ h->plt_offset);
@ -1161,7 +1225,7 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
+ input_section->output_offset);
if (r_type == R_386_PC32)
{
BFD_ASSERT (h != NULL && h->dynindx != (bfd_vma) -1);
BFD_ASSERT (h != NULL && h->dynindx != -1);
outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32);
}
else
@ -1395,111 +1459,120 @@ elf_i386_finish_dynamic_sections (output_bfd, info)
struct bfd_link_info *info;
{
bfd *dynobj;
asection *splt;
asection *sgot;
asection *sdyn;
Elf32_External_Dyn *dyncon, *dynconend;
dynobj = elf_hash_table (info)->dynobj;
splt = bfd_get_section_by_name (dynobj, ".plt");
sgot = bfd_get_section_by_name (dynobj, ".got.plt");
BFD_ASSERT (sgot != NULL);
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
BFD_ASSERT (splt != NULL && sgot != NULL && sdyn != NULL);
dyncon = (Elf32_External_Dyn *) sdyn->contents;
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
for (; dyncon < dynconend; dyncon++)
if (elf_hash_table (info)->dynamic_sections_created)
{
Elf_Internal_Dyn dyn;
const char *name;
asection *s;
asection *splt;
Elf32_External_Dyn *dyncon, *dynconend;
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
splt = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (splt != NULL && sdyn != NULL);
switch (dyn.d_tag)
dyncon = (Elf32_External_Dyn *) sdyn->contents;
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
for (; dyncon < dynconend; dyncon++)
{
default:
break;
Elf_Internal_Dyn dyn;
const char *name;
asection *s;
case DT_PLTGOT:
name = ".got";
goto get_vma;
case DT_JMPREL:
name = ".rel.plt";
get_vma:
s = bfd_get_section_by_name (output_bfd, name);
BFD_ASSERT (s != NULL);
dyn.d_un.d_ptr = s->vma;
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
break;
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
case DT_PLTRELSZ:
s = bfd_get_section_by_name (output_bfd, ".rel.plt");
BFD_ASSERT (s != NULL);
if (s->_cooked_size != 0)
dyn.d_un.d_val = s->_cooked_size;
else
dyn.d_un.d_val = s->_raw_size;
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
break;
case DT_RELSZ:
/* My reading of the SVR4 ABI indicates that the procedure
linkage table relocs (DT_JMPREL) should be included in
the overall relocs (DT_REL). This is what Solaris does.
However, UnixWare can not handle that case. Therefore,
we override the DT_RELSZ entry here to make it not
include the JMPREL relocs. Since the linker script
arranges for .rel.plt to follow all other relocation
sections, we don't have to worry about changing the
DT_REL entry. */
s = bfd_get_section_by_name (output_bfd, ".rel.plt");
if (s != NULL)
switch (dyn.d_tag)
{
if (s->_cooked_size != 0)
dyn.d_un.d_val -= s->_cooked_size;
else
dyn.d_un.d_val -= s->_raw_size;
}
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
break;
}
}
default:
break;
/* Fill in the first entry in the procedure linkage table. */
if (splt->_raw_size > 0)
{
if (info->shared)
memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
else
{
memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE);
bfd_put_32 (output_bfd,
sgot->output_section->vma + sgot->output_offset + 4,
splt->contents + 2);
bfd_put_32 (output_bfd,
sgot->output_section->vma + sgot->output_offset + 8,
splt->contents + 8);
case DT_PLTGOT:
name = ".got";
goto get_vma;
case DT_JMPREL:
name = ".rel.plt";
get_vma:
s = bfd_get_section_by_name (output_bfd, name);
BFD_ASSERT (s != NULL);
dyn.d_un.d_ptr = s->vma;
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
break;
case DT_PLTRELSZ:
s = bfd_get_section_by_name (output_bfd, ".rel.plt");
BFD_ASSERT (s != NULL);
if (s->_cooked_size != 0)
dyn.d_un.d_val = s->_cooked_size;
else
dyn.d_un.d_val = s->_raw_size;
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
break;
case DT_RELSZ:
/* My reading of the SVR4 ABI indicates that the
procedure linkage table relocs (DT_JMPREL) should be
included in the overall relocs (DT_REL). This is
what Solaris does. However, UnixWare can not handle
that case. Therefore, we override the DT_RELSZ entry
here to make it not include the JMPREL relocs. Since
the linker script arranges for .rel.plt to follow all
other relocation sections, we don't have to worry
about changing the DT_REL entry. */
s = bfd_get_section_by_name (output_bfd, ".rel.plt");
if (s != NULL)
{
if (s->_cooked_size != 0)
dyn.d_un.d_val -= s->_cooked_size;
else
dyn.d_un.d_val -= s->_raw_size;
}
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
break;
}
}
/* Fill in the first entry in the procedure linkage table. */
if (splt->_raw_size > 0)
{
if (info->shared)
memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
else
{
memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE);
bfd_put_32 (output_bfd,
sgot->output_section->vma + sgot->output_offset + 4,
splt->contents + 2);
bfd_put_32 (output_bfd,
sgot->output_section->vma + sgot->output_offset + 8,
splt->contents + 8);
}
}
/* UnixWare sets the entsize of .plt to 4, although that doesn't
really seem like the right value. */
elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
}
/* Fill in the first three entries in the global offset table. */
if (sgot->_raw_size > 0)
{
bfd_put_32 (output_bfd,
sdyn->output_section->vma + sdyn->output_offset,
sgot->contents);
if (sdyn == NULL)
bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
else
bfd_put_32 (output_bfd,
sdyn->output_section->vma + sdyn->output_offset,
sgot->contents);
bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
}
elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
/* UnixWare sets the entsize of .plt to 4, although that doesn't
really seem like the right value. */
elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
return true;
}

589
bfd/elf32-sparc.c
View File

@ -29,6 +29,8 @@ static void elf_info_to_howto
PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
static boolean elf32_sparc_create_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf32_sparc_create_got_section
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf32_sparc_check_relocs
PARAMS ((bfd *, struct bfd_link_info *, asection *,
const Elf_Internal_Rela *));
@ -38,7 +40,7 @@ static boolean elf32_sparc_size_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf32_sparc_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **, char *));
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static boolean elf32_sparc_finish_dynamic_symbol
PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
Elf_Internal_Sym *));
@ -101,8 +103,8 @@ static reloc_howto_type elf_sparc_howto_table[] =
HOWTO(R_SPARC_GOT13, 0,2,13,false,0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_GOT13", false,0,0x00001fff,true),
HOWTO(R_SPARC_GOT22, 10,2,22,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_GOT22", false,0,0x003fffff,true),
HOWTO(R_SPARC_PC10, 0,2,10,true, 0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_PC10", false,0,0x000003ff,true),
HOWTO(R_SPARC_PC22, 0,2,22,true, 0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_PC22", false,0,0x003fffff,true),
HOWTO(R_SPARC_WPLT30, 0,0,00,true, 0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_WPLT30", false,0,0x00000000,true),
HOWTO(R_SPARC_PC22, 10,2,22,true, 0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_PC22", false,0,0x003fffff,true),
HOWTO(R_SPARC_WPLT30, 2,2,30,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_WPLT30", false,0,0x3fffffff,true),
HOWTO(R_SPARC_COPY, 0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_COPY", false,0,0x00000000,true),
HOWTO(R_SPARC_GLOB_DAT,0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_GLOB_DAT",false,0,0x00000000,true),
HOWTO(R_SPARC_JMP_SLOT,0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_JMP_SLOT",false,0,0x00000000,true),
@ -232,18 +234,58 @@ elf32_sparc_create_dynamic_sections (abfd, info)
&& ! bfd_elf32_link_record_dynamic_symbol (info, h))
return false;
/* The first four entries in .plt are reserved. */
s->_raw_size = 4 * PLT_ENTRY_SIZE;
s = bfd_make_section (abfd, ".rela.plt");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
if (! elf32_sparc_create_got_section (abfd, info))
return false;
/* The .dynbss section is a place to put symbols which are defined
by dynamic objects, are referenced by regular objects, and are
not functions. We must allocate space for them in the process
image and use a R_SPARC_COPY reloc to tell the dynamic linker to
initialize them at run time. The linker script puts the .dynbss
section into the .bss section of the final image. */
s = bfd_make_section (abfd, ".dynbss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
return false;
/* The .rela.bss section holds copy relocs. */
if (! info->shared)
{
s = bfd_make_section (abfd, ".rela.bss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
}
return true;
}
/* Create the .got section to hold the global offset table. */
static boolean
elf32_sparc_create_got_section (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
register asection *s;
struct elf_link_hash_entry *h;
/* This function may be called more than once. */
if (bfd_get_section_by_name (abfd, ".got") != NULL)
return true;
s = bfd_make_section (abfd, ".got");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags)
|| ! bfd_set_section_flags (abfd, s,
(SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
| SEC_IN_MEMORY))
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
@ -270,29 +312,8 @@ elf32_sparc_create_dynamic_sections (abfd, info)
/* The first global offset table entry is reserved. */
s->_raw_size += 4;
/* The .dynbss section is a place to put symbols which are defined
by dynamic objects, are referenced by regular objects, and are
not functions. We must allocate space for them in the process
image and use a R_SPARC_COPY reloc to tell the dynamic linker to
initialize them at run time. The linker script puts the .dynbss
section into the .bss section of the final image. */
s = bfd_make_section (abfd, ".dynbss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
return false;
/* The .rela.bss section holds copy relocs. */
if (! info->shared)
{
s = bfd_make_section (abfd, ".rela.bss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
}
return true;
}
}
/* Look through the relocs for a section during the first phase, and
allocate space in the global offset table or procedure linkage
@ -313,8 +334,6 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
const Elf_Internal_Rela *rel_end;
asection *sgot;
asection *srelgot;
asection *splt;
asection *srelplt;
asection *sreloc;
if (info->relocateable)
@ -327,8 +346,6 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
sgot = NULL;
srelgot = NULL;
splt = NULL;
srelplt = NULL;
sreloc = NULL;
rel_end = relocs + sec->reloc_count;
@ -343,27 +360,6 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
else
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
/* Some relocs require a global offset table. FIXME: If this is
a static link, we don't really need to create the full
dynamic linking information. */
if (dynobj == NULL)
{
switch (ELF32_R_TYPE (rel->r_info))
{
case R_SPARC_GOT10:
case R_SPARC_GOT13:
case R_SPARC_GOT22:
case R_SPARC_WPLT30:
elf_hash_table (info)->dynobj = dynobj = abfd;
if (! bfd_elf32_link_create_dynamic_sections (dynobj, info))
return false;
break;
default:
break;
}
}
switch (ELF32_R_TYPE (rel->r_info))
{
case R_SPARC_GOT10:
@ -371,9 +367,23 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
case R_SPARC_GOT22:
/* This symbol requires a global offset table entry. */
if (dynobj == NULL)
{
/* Create the .got section. */
elf_hash_table (info)->dynobj = dynobj = abfd;
if (! elf32_sparc_create_got_section (dynobj, info))
return false;
}
if (sgot == NULL)
{
sgot = bfd_get_section_by_name (dynobj, ".got");
BFD_ASSERT (sgot != NULL);
}
if (srelgot == NULL
&& (h != NULL || info->shared))
{
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
if (srelgot == NULL)
{
@ -384,10 +394,10 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_READONLY)))
| SEC_READONLY))
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
return false;
}
BFD_ASSERT (sgot != NULL && srelgot != NULL);
}
if (h != NULL)
@ -398,6 +408,15 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
break;
}
h->got_offset = sgot->_raw_size;
/* Make sure this symbol is output as a dynamic symbol. */
if (h->dynindx == -1)
{
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
return false;
}
srelgot->_raw_size += sizeof (Elf32_External_Rela);
}
else
{
@ -425,15 +444,26 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
break;
}
local_got_offsets[r_symndx] = sgot->_raw_size;
if (info->shared)
{
/* If we are generating a shared object, we need to
output a R_SPARC_RELATIVE reloc so that the
dynamic linker can adjust this GOT entry. */
srelgot->_raw_size += sizeof (Elf32_External_Rela);
}
}
sgot->_raw_size += 4;
srelgot->_raw_size += sizeof (Elf32_External_Rela);
break;
case R_SPARC_WPLT30:
/* This symbol requires a procedure linkage table entry. */
/* This symbol requires a procedure linkage table entry. We
actually build the entry in adjust_dynamic_symbol,
because this might be a case of linking PIC code without
linking in any dynamic objects, in which case we don't
need to generate a procedure linkage table after all. */
if (h == NULL)
{
@ -443,32 +473,14 @@ elf32_sparc_check_relocs (abfd, info, sec, relocs)
return false;
}
if (h->plt_offset != (bfd_vma) -1)
/* Make sure this symbol is output as a dynamic symbol. */
if (h->dynindx == -1)
{
/* There is already an entry for this symbol in the
procedure linkage table. */
break;
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
return false;
}
if (splt == NULL)
{
splt = bfd_get_section_by_name (dynobj, ".plt");
srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
BFD_ASSERT (splt != NULL && srelplt != NULL);
}
/* The procedure linkage table has a maximum size. */
if (splt->_raw_size >= 0x400000)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
h->plt_offset = splt->_raw_size;
/* Make room for this entry. */
splt->_raw_size += PLT_ENTRY_SIZE;
srelplt->_raw_size += sizeof (Elf32_External_Rela);
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
break;
@ -560,49 +572,66 @@ elf32_sparc_adjust_dynamic_symbol (info, h)
/* Make sure we know what is going on here. */
BFD_ASSERT (dynobj != NULL
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
&& h->root.type == bfd_link_hash_defined
&& (bfd_get_flavour (h->root.u.def.section->owner)
== bfd_target_elf_flavour)
&& (elf_elfheader (h->root.u.def.section->owner)->e_type
== ET_DYN)
&& h->root.u.def.section->output_section == NULL);
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
|| ((h->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC) != 0
&& (h->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR) != 0
&& (h->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR) == 0
&& (elf_elfheader (h->root.u.def.section->owner)->e_type
== ET_DYN)
&& h->root.u.def.section->output_section == NULL)));
/* If this is a function, put it in the procedure linkage table. We
will fill in the contents of the procedure linkage table later
(although we could actually do it here). */
if (h->type == STT_FUNC)
if (h->type == STT_FUNC
|| (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
{
if (h->plt_offset == (bfd_vma) -1)
if (! elf_hash_table (info)->dynamic_sections_created)
{
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
/* The procedure linkage table has a maximum size. */
if (s->_raw_size >= 0x400000)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
/* Set the symbol to this location in the .plt. */
h->root.u.def.section = s;
h->root.u.def.value = s->_raw_size;
h->plt_offset = s->_raw_size;
/* Make room for this entry. */
s->_raw_size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .rela.plt section. */
s = bfd_get_section_by_name (dynobj, ".rela.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += sizeof (Elf32_External_Rela);
/* This case can occur if we saw a WPLT30 reloc in an input
file, but none of the input files were dynamic objects.
In such a case, we don't actually need to build a
procedure linkage table, and we can just do a WDISP30
reloc instead. */
BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
return true;
}
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
/* The first four entries in .plt are reserved. */
if (s->_raw_size == 0)
s->_raw_size = 4 * PLT_ENTRY_SIZE;
/* The procedure linkage table has a maximum size. */
if (s->_raw_size >= 0x400000)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
/* Set the symbol to this location in the .plt. */
h->root.u.def.section = s;
h->root.u.def.value = s->_raw_size;
h->plt_offset = s->_raw_size;
/* Make room for this entry. */
s->_raw_size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .rela.plt section. */
s = bfd_get_section_by_name (dynobj, ".rela.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += sizeof (Elf32_External_Rela);
return true;
}
@ -696,19 +725,34 @@ elf32_sparc_size_dynamic_sections (output_bfd, info)
dynobj = elf_hash_table (info)->dynobj;
BFD_ASSERT (dynobj != NULL);
/* Set the contents of the .interp section to the interpreter. */
if (! info->shared)
if (elf_hash_table (info)->dynamic_sections_created)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
}
/* Set the contents of the .interp section to the interpreter. */
if (! info->shared)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
}
/* Make space for the trailing nop in .plt. */
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
s->_raw_size += 4;
/* Make space for the trailing nop in .plt. */
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
if (s->_raw_size > 0)
s->_raw_size += 4;
}
else
{
/* We may have created entries in the .rela.got section.
However, if we are not creating the dynamic sections, we will
not actually use these entries. Reset the size of .rela.got,
which will cause it to get stripped from the output file
below. */
s = bfd_get_section_by_name (dynobj, ".rela.got");
if (s != NULL)
s->_raw_size = 0;
}
/* The check_relocs and adjust_dynamic_symbol entry points have
determined the sizes of the various dynamic sections. Allocate
@ -717,6 +761,7 @@ elf32_sparc_size_dynamic_sections (output_bfd, info)
for (s = dynobj->sections; s != NULL; s = s->next)
{
const char *name;
boolean strip;
if ((s->flags & SEC_IN_MEMORY) == 0)
continue;
@ -725,21 +770,38 @@ elf32_sparc_size_dynamic_sections (output_bfd, info)
of the dynobj section names depend upon the input files. */
name = bfd_get_section_name (dynobj, s);
if (strncmp (name, ".rela", 5) == 0
&& s->_raw_size > 0)
strip = false;
if (strncmp (name, ".rela", 5) == 0)
{
asection *target;
if (s->_raw_size == 0)
{
/* If we don't need this section, strip it from the
output file. This is to handle .rela.bss and
.rel.plt. We must create it in
create_dynamic_sections, because it must be created
before the linker maps input sections to output
sections. The linker does that before
adjust_dynamic_symbol is called, and it is that
function which decides whether anything needs to go
into these sections. */
strip = true;
}
else
{
asection *target;
/* If this relocation section applies to a read only
section, then we probably need a DT_TEXTREL entry. */
target = bfd_get_section_by_name (output_bfd, name + 5);
if (target != NULL
&& (target->flags & SEC_READONLY) != 0)
reltext = true;
/* If this relocation section applies to a read only
section, then we probably need a DT_TEXTREL entry. */
target = bfd_get_section_by_name (output_bfd, name + 5);
if (target != NULL
&& (target->flags & SEC_READONLY) != 0)
reltext = true;
/* We use the reloc_count field as a counter if we need to
copy relocs into the output file. */
s->reloc_count = 0;
/* We use the reloc_count field as a counter if we need
to copy relocs into the output file. */
s->reloc_count = 0;
}
}
else if (strcmp (name, ".plt") != 0
&& strcmp (name, ".got") != 0)
@ -747,7 +809,21 @@ elf32_sparc_size_dynamic_sections (output_bfd, info)
/* It's not one of our sections, so don't allocate space. */
continue;
}
if (strip)
{
asection **spp;
for (spp = &s->output_section->owner->sections;
*spp != s->output_section;
spp = &(*spp)->next)
;
*spp = s->output_section->next;
--s->output_section->owner->section_count;
continue;
}
/* Allocate memory for the section contents. */
s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
if (s->contents == NULL && s->_raw_size != 0)
@ -757,31 +833,34 @@ elf32_sparc_size_dynamic_sections (output_bfd, info)
}
}
/* Add some entries to the .dynamic section. We fill in the values
later, in elf32_sparc_finish_dynamic_sections, but we must add
the entries now so that we get the correct size for the .dynamic
section. The DT_DEBUG entry is filled in by the dynamic linker
and used by the debugger. */
if (! info->shared)
if (elf_hash_table (info)->dynamic_sections_created)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
return false;
}
/* Add some entries to the .dynamic section. We fill in the
values later, in elf32_sparc_finish_dynamic_sections, but we
must add the entries now so that we get the correct size for
the .dynamic section. The DT_DEBUG entry is filled in by the
dynamic linker and used by the debugger. */
if (! info->shared)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
return false;
}
if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
|| ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
sizeof (Elf32_External_Rela)))
return false;
if (reltext)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
|| ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
sizeof (Elf32_External_Rela)))
return false;
if (reltext)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
return false;
}
}
return true;
@ -791,8 +870,7 @@ elf32_sparc_size_dynamic_sections (output_bfd, info)
static boolean
elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, local_syms, local_sections,
output_names)
contents, relocs, local_syms, local_sections)
bfd *output_bfd;
struct bfd_link_info *info;
bfd *input_bfd;
@ -801,7 +879,6 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
Elf_Internal_Rela *relocs;
Elf_Internal_Sym *local_syms;
asection **local_sections;
char *output_names;
{
bfd *dynobj;
Elf_Internal_Shdr *symtab_hdr;
@ -915,8 +992,33 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
if (h != NULL)
{
BFD_ASSERT (h->got_offset != (bfd_vma) -1);
relocation = sgot->output_offset + h->got_offset;
bfd_vma off;
off = h->got_offset;
BFD_ASSERT (off != (bfd_vma) -1);
if (! elf_hash_table (info)->dynamic_sections_created)
{
/* This is actually a static link. We must
initialize this entry in the global offset table.
Since the offset must always be a multiple of 4,
we use the least significant bit to record
whether we have initialized it already.
When doing a dynamic link, we create a .rela.got
relocation entry to initialize the value. This
is done in the finish_dynamic_symbol routine. */
if ((off & 1) != 0)
off &= ~1;
else
{
bfd_put_32 (output_bfd, relocation,
sgot->contents + off);
h->got_offset |= 1;
}
}
relocation = sgot->output_offset + off;
}
else
{
@ -928,30 +1030,35 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
off = local_got_offsets[r_symndx];
/* The offset must always be a multiple of 4. We use
the least significant bit to record whether we have
already generated the necessary reloc. */
the least significant bit to record whether we have
already processed this entry. */
if ((off & 1) != 0)
off &= ~1;
else
{
asection *srelgot;
Elf_Internal_Rela outrel;
bfd_put_32 (output_bfd, relocation, sgot->contents + off);
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
BFD_ASSERT (srelgot != NULL);
if (info->shared)
{
asection *srelgot;
Elf_Internal_Rela outrel;
outrel.r_offset = (sgot->output_section->vma
+ sgot->output_offset
+ off);
outrel.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
outrel.r_addend = 0;
bfd_elf32_swap_reloca_out (output_bfd, &outrel,
(((Elf32_External_Rela *)
srelgot->contents)
+ srelgot->reloc_count));
++srelgot->reloc_count;
/* We need to generate a R_SPARC_RELATIVE reloc
for the dynamic linker. */
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
BFD_ASSERT (srelgot != NULL);
outrel.r_offset = (sgot->output_section->vma
+ sgot->output_offset
+ off);
outrel.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
outrel.r_addend = 0;
bfd_elf32_swap_reloca_out (output_bfd, &outrel,
(((Elf32_External_Rela *)
srelgot->contents)
+ srelgot->reloc_count));
++srelgot->reloc_count;
}
local_got_offsets[r_symndx] |= 1;
}
@ -964,13 +1071,21 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
case R_SPARC_WPLT30:
/* Relocation is to the entry for this symbol in the
procedure linkage table. */
BFD_ASSERT (h != NULL);
if (h->plt_offset == (bfd_vma) -1)
{
/* We didn't make a PLT entry for this symbol. This
happens when statically linking PIC code. */
break;
}
if (splt == NULL)
{
splt = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (splt != NULL);
}
BFD_ASSERT (h != NULL && h->plt_offset != (bfd_vma) -1);
relocation = (splt->output_section->vma
+ splt->output_offset
+ h->plt_offset);
@ -1029,7 +1144,7 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
+ input_section->output_offset);
if (h != NULL)
{
BFD_ASSERT (h->dynindx != (bfd_vma) -1);
BFD_ASSERT (h->dynindx != -1);
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
outrel.r_addend = 0;
}
@ -1098,7 +1213,9 @@ elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
name = h->root.root.string;
else
{
name = output_names + sym->st_name;
name = elf_string_from_elf_section (input_bfd,
symtab_hdr->sh_link,
sym->st_name);
if (name == NULL)
return false;
if (*name == '\0')
@ -1244,74 +1361,86 @@ elf32_sparc_finish_dynamic_sections (output_bfd, info)
struct bfd_link_info *info;
{
bfd *dynobj;
asection *splt;
asection *sgot;
asection *sdyn;
Elf32_External_Dyn *dyncon, *dynconend;
asection *sgot;
dynobj = elf_hash_table (info)->dynobj;
splt = bfd_get_section_by_name (dynobj, ".plt");
sgot = bfd_get_section_by_name (dynobj, ".got");
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
BFD_ASSERT (splt != NULL && sgot != NULL && sdyn != NULL);
dyncon = (Elf32_External_Dyn *) sdyn->contents;
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
for (; dyncon < dynconend; dyncon++)
if (elf_hash_table (info)->dynamic_sections_created)
{
Elf_Internal_Dyn dyn;
const char *name;
boolean size;
asection *splt;
Elf32_External_Dyn *dyncon, *dynconend;
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
splt = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (splt != NULL && sdyn != NULL);
switch (dyn.d_tag)
dyncon = (Elf32_External_Dyn *) sdyn->contents;
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
for (; dyncon < dynconend; dyncon++)
{
case DT_PLTGOT: name = ".plt"; size = false; break;
case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
case DT_JMPREL: name = ".rela.plt"; size = false; break;
default: name = NULL; size = false; break;
}
Elf_Internal_Dyn dyn;
const char *name;
boolean size;
if (name != NULL)
{
asection *s;
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
s = bfd_get_section_by_name (output_bfd, name);
BFD_ASSERT (s != NULL);
if (! size)
dyn.d_un.d_ptr = s->vma;
else
switch (dyn.d_tag)
{
if (s->_cooked_size != 0)
dyn.d_un.d_val = s->_cooked_size;
else
dyn.d_un.d_val = s->_raw_size;
case DT_PLTGOT: name = ".plt"; size = false; break;
case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
case DT_JMPREL: name = ".rela.plt"; size = false; break;
default: name = NULL; size = false; break;
}
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
}
}
/* Clear the first four entries in the procedure linkage table, and
put a nop in the last four bytes. */
if (splt->_raw_size > 0)
{
memset (splt->contents, 0, 4 * PLT_ENTRY_SIZE);
bfd_put_32 (output_bfd, SPARC_NOP,
splt->contents + splt->_raw_size - 4);
if (name != NULL)
{
asection *s;
s = bfd_get_section_by_name (output_bfd, name);
BFD_ASSERT (s != NULL);
if (! size)
dyn.d_un.d_ptr = s->vma;
else
{
if (s->_cooked_size != 0)
dyn.d_un.d_val = s->_cooked_size;
else
dyn.d_un.d_val = s->_raw_size;
}
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
}
}
/* Clear the first four entries in the procedure linkage table,
and put a nop in the last four bytes. */
if (splt->_raw_size > 0)
{
memset (splt->contents, 0, 4 * PLT_ENTRY_SIZE);
bfd_put_32 (output_bfd, SPARC_NOP,
splt->contents + splt->_raw_size - 4);
}
elf_section_data (splt->output_section)->this_hdr.sh_entsize =
PLT_ENTRY_SIZE;
}
/* Set the first entry in the global offset table to the address of
the dynamic section. */
sgot = bfd_get_section_by_name (dynobj, ".got");
BFD_ASSERT (sgot != NULL);
if (sgot->_raw_size > 0)
bfd_put_32 (output_bfd,
sdyn->output_section->vma + sdyn->output_offset,
sgot->contents);
{
if (sdyn == NULL)
bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
else
bfd_put_32 (output_bfd,
sdyn->output_section->vma + sdyn->output_offset,
sgot->contents);
}
elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
elf_section_data (splt->output_section)->this_hdr.sh_entsize =
PLT_ENTRY_SIZE;
return true;
}

318
bfd/elfcode.h
View File

@ -3868,21 +3868,36 @@ elf_link_add_archive_symbols (abfd, info)
/* Record a new dynamic symbol. We record the dynamic symbols as we
read the input files, since we need to have a list of all of them
before we can determine the final sizes of the output sections. */
before we can determine the final sizes of the output sections.
Note that we may actually call this function even though we are not
going to output any dynamic symbols; in some cases we know that a
symbol should be in the dynamic symbol table, but only if there is
one. */
INLINE boolean
boolean
elf_link_record_dynamic_symbol (info, h)
struct bfd_link_info *info;
struct elf_link_hash_entry *h;
{
if (h->dynindx == -1)
{
struct bfd_strtab_hash *dynstr;
h->dynindx = elf_hash_table (info)->dynsymcount;
++elf_hash_table (info)->dynsymcount;
h->dynstr_index =
(unsigned long) _bfd_stringtab_add (elf_hash_table (info)->dynstr,
h->root.root.string,
true, false);
dynstr = elf_hash_table (info)->dynstr;
if (dynstr == NULL)
{
/* Create a strtab to hold the dynamic symbol names. */
elf_hash_table (info)->dynstr = dynstr = elf_stringtab_init ();
if (dynstr == NULL)
return false;
}
h->dynstr_index = ((unsigned long)
_bfd_stringtab_add (dynstr, h->root.root.string,
true, false));
if (h->dynstr_index == (unsigned long) -1)
return false;
}
@ -3975,12 +3990,11 @@ elf_link_add_object_symbols (abfd, info)
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)->dynobj == NULL
&& ! elf_hash_table (info)->dynamic_sections_created
&& abfd->xvec == info->hash->creator)
{
if (! elf_link_create_dynamic_sections (abfd, info))
goto error_return;
elf_hash_table (info)->dynobj = abfd;
}
}
else
@ -4065,14 +4079,11 @@ elf_link_add_object_symbols (abfd, info)
abfd->sections = NULL;
/* If this is the first dynamic object found in the link, create
the special sections required for dynamic linking. We need
to put them somewhere, and attaching them to the first
dynamic object is as good place as any. */
if (elf_hash_table (info)->dynobj == NULL)
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;
elf_hash_table (info)->dynobj = abfd;
}
/* Add a DT_NEEDED entry for this dynamic object. */
@ -4464,11 +4475,11 @@ elf_link_add_object_symbols (abfd, info)
}
/* Create some sections which will be filled in with dynamic linking
information. The ABFD argument is an input file which is a dynamic
object. 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. */
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)
@ -4480,6 +4491,15 @@ elf_link_create_dynamic_sections (abfd, info)
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;
@ -4500,18 +4520,18 @@ elf_link_create_dynamic_sections (abfd, info)
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
return false;
/* The first .dynsym symbol is a dummy. */
elf_hash_table (info)->dynsymcount = 1;
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. */
elf_hash_table (info)->dynstr = elf_stringtab_init ();
if (elf_hash_table (info)->dynstr == NULL)
return false;
{
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
@ -4550,7 +4570,12 @@ elf_link_create_dynamic_sections (abfd, info)
backend set the right flags. The backend will normally create
the .got and .plt sections. */
bed = get_elf_backend_data (abfd);
return (*bed->elf_backend_create_dynamic_sections) (abfd, info);
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. */
@ -4777,7 +4802,6 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath, info,
asection **sinterpptr;
{
bfd *dynobj;
size_t dynsymcount;
asection *s;
Elf_Internal_Sym isym;
size_t i;
@ -4787,127 +4811,138 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath, info,
*sinterpptr = NULL;
dynobj = elf_hash_table (info)->dynobj;
dynsymcount = elf_hash_table (info)->dynsymcount;
/* If there were no dynamic objects in the link, there is nothing to
do here. */
if (dynobj == NULL)
return true;
*sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (*sinterpptr != NULL || info->shared);
/* 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)
if (elf_hash_table (info)->dynamic_sections_created)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
size_t dynsymcount;
bfd_size_type strsize;
/* 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,
(Elf_External_Sym *) s->contents);
*sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (*sinterpptr != NULL || info->shared);
for (i = 0; elf_buckets[i] != 0; i++)
{
bucketcount = elf_buckets[i];
if (dynsymcount < elf_buckets[i + 1])
break;
}
/* 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. */
dynsymcount = elf_hash_table (info)->dynsymcount;
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)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
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)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
memset (s->contents, 0, s->_raw_size);
/* 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,
(Elf_External_Sym *) s->contents);
put_word (output_bfd, bucketcount, s->contents);
put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8));
for (i = 0; elf_buckets[i] != 0; i++)
{
bucketcount = elf_buckets[i];
if (dynsymcount < elf_buckets[i + 1])
break;
}
elf_hash_table (info)->bucketcount = bucketcount;
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)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
memset (s->contents, 0, s->_raw_size);
if (soname != NULL)
{
bfd_size_type indx;
put_word (output_bfd, bucketcount, s->contents);
put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8));
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, soname,
true, true);
if (indx == (bfd_size_type) -1
|| ! elf_add_dynamic_entry (info, DT_SONAME, indx))
return false;
}
elf_hash_table (info)->bucketcount = bucketcount;
if (rpath != NULL)
{
bfd_size_type indx;
if (soname != 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))
indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, soname,
true, true);
if (indx == (bfd_size_type) -1
|| ! elf_add_dynamic_entry (info, DT_SONAME, indx))
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;
}
s = bfd_get_section_by_name (dynobj, ".dynstr");
BFD_ASSERT (s != NULL);
s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
/* Find all symbols which were defined in a dynamic object and make
the backend pick a reasonable value for them. */
elf_link_hash_traverse (elf_hash_table (info),
elf_adjust_dynamic_symbol,
(PTR) info);
/* 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. */
if (bfd_get_section_by_name (output_bfd, ".init") != NULL)
{
if (! elf_add_dynamic_entry (info, DT_INIT, 0))
return false;
}
if (bfd_get_section_by_name (output_bfd, ".fini") != NULL)
{
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;
}
s = bfd_get_section_by_name (dynobj, ".dynstr");
BFD_ASSERT (s != NULL);
s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
/* Find all symbols which were defined in a dynamic object and make
the backend pick a reasonable value for them. */
elf_link_hash_traverse (elf_hash_table (info),
elf_adjust_dynamic_symbol,
(PTR) info);
/* 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. */
if (bfd_get_section_by_name (output_bfd, ".init") != NULL)
{
if (! elf_add_dynamic_entry (info, DT_INIT, 0))
return false;
}
if (bfd_get_section_by_name (output_bfd, ".fini") != NULL)
{
if (! elf_add_dynamic_entry (info, DT_FINI, 0))
return false;
}
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,
_bfd_stringtab_size (elf_hash_table (info)
->dynstr))
|| ! 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. */
bed = get_elf_backend_data (output_bfd);
if (! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
return false;
return elf_add_dynamic_entry (info, DT_NULL, 0);
if (elf_hash_table (info)->dynamic_sections_created)
{
if (! elf_add_dynamic_entry (info, DT_NULL, 0))
return false;
}
return true;
}
/* Make the backend pick a good value for a dynamic symbol. This is
@ -4923,13 +4958,15 @@ elf_adjust_dynamic_symbol (h, data)
bfd *dynobj;
struct elf_backend_data *bed;
/* If this symbol is not defined by a dynamic object, or is not
referenced by a regular object, ignore it. FIXME: Do we 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_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)
/* 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. FIXME: Do we 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))
return true;
/* If we've already adjusted this symbol, don't do it again. This
@ -5069,6 +5106,7 @@ 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;
@ -5088,6 +5126,7 @@ elf_bfd_final_link (abfd, info)
if (info->shared)
abfd->flags |= DYNAMIC;
dynamic = elf_hash_table (info)->dynamic_sections_created;
dynobj = elf_hash_table (info)->dynobj;
finfo.info = info;
@ -5095,7 +5134,7 @@ elf_bfd_final_link (abfd, info)
finfo.symstrtab = elf_stringtab_init ();
if (finfo.symstrtab == NULL)
return false;
if (dynobj == NULL)
if (! dynamic)
{
finfo.dynsym_sec = NULL;
finfo.hash_sec = NULL;
@ -5415,7 +5454,7 @@ elf_bfd_final_link (abfd, info)
/* The sh_info field records the index of the first non local
symbol. */
symtab_hdr->sh_info = abfd->symcount;
if (dynobj != NULL)
if (dynamic)
elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = 1;
/* We get the global symbols from the hash table. */
@ -5500,9 +5539,9 @@ elf_bfd_final_link (abfd, info)
o->reloc_count = 0;
}
/* If we are linking against a dynamic object, finish up the dynamic
linking information. */
if (dynobj != NULL)
/* 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;
@ -5577,13 +5616,18 @@ elf_bfd_final_link (abfd, info)
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)
if ((o->flags & SEC_HAS_CONTENTS) == 0
|| o->_raw_size == 0)
continue;
if ((o->flags & SEC_IN_MEMORY) == 0)
{
@ -5859,7 +5903,8 @@ elf_link_output_extsym (h, data)
/* 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)
if (h->dynindx != -1
&& elf_hash_table (finfo->info)->dynamic_sections_created)
{
struct elf_backend_data *bed;
size_t bucketcount;
@ -5885,7 +5930,8 @@ elf_link_output_extsym (h, data)
+ h->dynindx));
bucketcount = elf_hash_table (finfo->info)->bucketcount;
bucket = bfd_elf_hash ((const unsigned char *) h->root.root.string) % bucketcount;
bucket = (bfd_elf_hash ((const unsigned char *) h->root.root.string)
% bucketcount);
bucketpos = ((bfd_byte *) finfo->hash_sec->contents
+ (bucket + 2) * (ARCH_SIZE / 8));
chain = get_word (finfo->output_bfd, bucketpos);

11
bfd/libelf.h
View File

@ -121,6 +121,8 @@ struct elf_link_hash_entry
#define ELF_LINK_HASH_DEFINED_WEAK 040
/* Symbol needs a copy reloc. */
#define ELF_LINK_HASH_NEEDS_COPY 0100
/* Symbol needs a procedure linkage table entry. */
#define ELF_LINK_HASH_NEEDS_PLT 0200
};
/* ELF linker hash table. */
@ -128,9 +130,12 @@ struct elf_link_hash_entry
struct elf_link_hash_table
{
struct bfd_link_hash_table root;
/* The first dynamic object found during a link. We create several
special input sections when linking against dynamic objects, and
we simply attach them to the first one found. */
/* Whether we have created the special dynamic sections required
when linking against or generating a shared object. */
boolean dynamic_sections_created;
/* The BFD used to hold special sections created by the linker.
This will be the first BFD found which requires these sections to
be created. */
bfd *dynobj;
/* The number of symbols found in the link which must be put into
the .dynsym section. */