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x86: Add _bfd_x86_elf_hide_symbol 

When there is no dynamic interpreter in PIE, make the undefined weak
symbol dynamic so that PC relative branch to the undefined weak symbol
will land to address 0.

	* elf32-i386.c (elf_backend_hide_symbol): New.
	* elf64-x86-64.c (elf_backend_hide_symbol): Likewise.
	* elfxx-x86.c (_bfd_x86_elf_hide_symbol): Likewise.
	* elfxx-x86.h (_bfd_x86_elf_hide_symbol): Likewise.
This commit is contained in:
H.J. Lu 2017-10-12 02:12:47 -07:00
parent 359987e218
commit 9f8575350f
5 changed files with 35 additions and 1 deletions
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7
bfd/ChangeLog
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@ -1,3 +1,10 @@
2017-10-12 H.J. Lu <hongjiu.lu@intel.com>
* elf32-i386.c (elf_backend_hide_symbol): New.
* elf64-x86-64.c (elf_backend_hide_symbol): Likewise.
* elfxx-x86.c (_bfd_x86_elf_hide_symbol): Likewise.
* elfxx-x86.h (_bfd_x86_elf_hide_symbol): Likewise.
2017-10-12 Alan Modra <amodra@gmail.com>
* elflink.c (_bfd_elf_adjust_dynamic_symbol): Call

1
bfd/elf32-i386.c
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@ -4586,6 +4586,7 @@ elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
#define elf_backend_reloc_type_class elf_i386_reloc_type_class
#define elf_backend_relocate_section elf_i386_relocate_section
#define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
#define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
#define elf_backend_linux_prpsinfo32_ugid16 TRUE

4
bfd/elf64-x86-64.c
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@ -5187,7 +5187,9 @@ elf_x86_64_special_sections[]=
#define elf_backend_additional_program_headers \
elf_x86_64_additional_program_headers
#define elf_backend_setup_gnu_properties \
elf_x86_64_link_setup_gnu_properties
elf_x86_64_link_setup_gnu_properties
#define elf_backend_hide_symbol \
_bfd_x86_elf_hide_symbol
#include "elf64-target.h"

21
bfd/elfxx-x86.c
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@ -1668,6 +1668,27 @@ _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
return _bfd_elf_adjust_dynamic_copy (info, h, s);
}
void
_bfd_x86_elf_hide_symbol (struct bfd_link_info *info,
struct elf_link_hash_entry *h,
bfd_boolean force_local)
{
if (h->root.type == bfd_link_hash_undefweak
&& info->nointerp
&& bfd_link_pie (info))
{
/* When there is no dynamic interpreter in PIE, make the undefined
weak symbol dynamic so that PC relative branch to the undefined
weak symbol will land to address 0. */
struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
if (h->plt.refcount > eh->func_pointer_refcount
|| eh->plt_got.refcount > 0)
return;
}
_bfd_elf_link_hash_hide_symbol (info, h, force_local);
}
/* Return TRUE if a symbol is referenced locally. It is similar to
SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
works in check_relocs. */

3
bfd/elfxx-x86.h
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@ -621,6 +621,9 @@ extern bfd_boolean _bfd_x86_elf_hash_symbol
extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
(struct bfd_link_info *, struct elf_link_hash_entry *);
extern void _bfd_x86_elf_hide_symbol
(struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
(struct bfd_link_info *, struct elf_link_hash_entry *);