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x86: Use zero_undefweak in elf_x86_link_hash_entry 

Replace has_got_reloc and has_non_got_reloc in elf_x86_link_hash_entry
with zero_undefweak:

Bit 0: Symbol has no GOT nor PLT relocations.
Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.

zero_undefweak is initialized to 1 and undefined weak symbol should be
resolved to 0 if zero_undefweak > 0.

	* elf32-i386.c (elf_i386_check_relocs): Replace has_got_reloc
	and has_non_got_reloc with zero_undefweak.
	* elf64-x86-64.c (elf_x86_64_check_relocs): Likewise.
	* elfxx-x86.c (_bfd_x86_elf_link_hash_newfunc): Initialize
	zero_undefweak to 1.
	(_bfd_x86_elf_copy_indirect_symbol): Replace has_got_reloc and
	has_non_got_reloc with zero_undefweak.
	* elfxx-x86.h (UNDEFINED_WEAK_RESOLVED_TO_ZERO): Replace
	has_got_reloc and has_non_got_reloc with zero_undefweak.
	(elf_x86_link_hash_entry): Likewise.
This commit is contained in:
H.J. Lu 2017-10-06 15:25:07 -07:00
parent b3b7c42388
commit 98b273dc13
5 changed files with 29 additions and 17 deletions
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13
bfd/ChangeLog
View File

@ -11,6 +11,19 @@
* elfxx-target.h (elf_backend_grok_freebsd_prstatus): Define.
(elfNN_bed): Initialize `elf_backend_grok_freebsd_prstatus'.
2017-10-06 H.J. Lu <hongjiu.lu@intel.com>
* elf32-i386.c (elf_i386_check_relocs): Replace has_got_reloc
and has_non_got_reloc with zero_undefweak.
* elf64-x86-64.c (elf_x86_64_check_relocs): Likewise.
* elfxx-x86.c (_bfd_x86_elf_link_hash_newfunc): Initialize
zero_undefweak to 1.
(_bfd_x86_elf_copy_indirect_symbol): Replace has_got_reloc and
has_non_got_reloc with zero_undefweak.
* elfxx-x86.h (UNDEFINED_WEAK_RESOLVED_TO_ZERO): Replace
has_got_reloc and has_non_got_reloc with zero_undefweak.
(elf_x86_link_hash_entry): Likewise.
2017-10-06 H.J. Lu <hongjiu.lu@intel.com>
* elfxx-x86.h (COPY_INPUT_RELOC_P): Add "do/while(0);".

8
bfd/elf32-i386.c
View File

@ -1619,7 +1619,7 @@ elf_i386_check_relocs (bfd *abfd,
if (h == NULL)
continue;
eh->has_got_reloc = 1;
eh->zero_undefweak &= 0x2;
h->needs_plt = 1;
h->plt.refcount += 1;
break;
@ -1746,7 +1746,7 @@ elf_i386_check_relocs (bfd *abfd,
if (r_type != R_386_TLS_IE)
{
if (eh != NULL)
eh->has_got_reloc = 1;
eh->zero_undefweak &= 0x2;
break;
}
/* Fall through */
@ -1754,7 +1754,7 @@ elf_i386_check_relocs (bfd *abfd,
case R_386_TLS_LE_32:
case R_386_TLS_LE:
if (eh != NULL)
eh->has_got_reloc = 1;
eh->zero_undefweak &= 0x2;
if (bfd_link_executable (info))
break;
info->flags |= DF_STATIC_TLS;
@ -1763,7 +1763,7 @@ elf_i386_check_relocs (bfd *abfd,
case R_386_32:
case R_386_PC32:
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->has_non_got_reloc = 1;
eh->zero_undefweak |= 0x2;
do_relocation:
/* We are called after all symbols have been resolved. Only
relocation against STT_GNU_IFUNC symbol must go through

8
bfd/elf64-x86-64.c
View File

@ -1958,7 +1958,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
&x86_64_elf_howto_table[r_type]);
if (eh != NULL)
eh->has_got_reloc = 1;
eh->zero_undefweak &= 0x2;
break;
case R_X86_64_GOTTPOFF:
@ -2066,7 +2066,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
case R_X86_64_GOTPC64:
create_got:
if (eh != NULL)
eh->has_got_reloc = 1;
eh->zero_undefweak &= 0x2;
break;
case R_X86_64_PLT32:
@ -2083,7 +2083,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
if (h == NULL)
continue;
eh->has_got_reloc = 1;
eh->zero_undefweak &= 0x2;
h->needs_plt = 1;
h->plt.refcount += 1;
break;
@ -2134,7 +2134,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
case R_X86_64_64:
pointer:
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->has_non_got_reloc = 1;
eh->zero_undefweak |= 0x2;
/* We are called after all symbols have been resolved. Only
relocation against STT_GNU_IFUNC symbol must go through
PLT. */

4
bfd/elfxx-x86.c
View File

@ -676,6 +676,7 @@ _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
eh->plt_second.offset = (bfd_vma) -1;
eh->plt_got.offset = (bfd_vma) -1;
eh->tlsdesc_got = (bfd_vma) -1;
eh->zero_undefweak = 1;
}
return entry;
@ -1407,8 +1408,7 @@ _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info,
generate a R_386_COPY reloc. */
edir->gotoff_ref |= eind->gotoff_ref;
edir->has_got_reloc |= eind->has_got_reloc;
edir->has_non_got_reloc |= eind->has_non_got_reloc;
edir->zero_undefweak |= eind->zero_undefweak;
if (ELIMINATE_COPY_RELOCS
&& ind->root.type != bfd_link_hash_indirect

13
bfd/elfxx-x86.h
View File

@ -60,8 +60,7 @@
((EH)->elf.root.type == bfd_link_hash_undefweak \
&& (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \
|| (bfd_link_executable (INFO) \
&& (!(EH)->has_got_reloc \
|| (EH)->has_non_got_reloc))))
&& (EH)->zero_undefweak > 0)))
/* Should copy relocation be generated for a symbol. Don't generate
copy relocation against a protected symbol defined in a shared
@ -236,11 +235,11 @@ struct elf_x86_link_hash_entry
unsigned char tls_type;
/* TRUE if symbol has GOT or PLT relocations. */
unsigned int has_got_reloc : 1;
/* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
unsigned int has_non_got_reloc : 1;
/* Bit 0: Symbol has no GOT nor PLT relocations.
Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.
zero_undefweak is initialized to 1 and undefined weak symbol
should be resolved to 0 if zero_undefweak > 0. */
unsigned int zero_undefweak : 2;
/* Don't call finish_dynamic_symbol on this symbol. */
unsigned int no_finish_dynamic_symbol : 1;