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bfd/

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2009-06-01  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/10205
	* elf32-i386.c (elf_howto_table): Add R_386_IRELATIVE.
	(elf_i386_reloc_type_lookup): Likewise.
	(R_386_tls): Removed.
	(R_386_irelative): New.
	(R_386_vt_offset): Updated.
	(elf_i386_rtype_to_howto): Likewise.
	(elf_i386_link_hash_table): Add igotplt, iplt and irelplt.
	(elf_i386_link_hash_table_create): Initialize igotplt,
	iplt and irelplt.
	(elf_i386_check_relocs): Handle STT_GNU_IFUNC symbol first.
	(elf_i386_adjust_dynamic_symbol): Likewise.
	(elf_i386_allocate_dynrelocs): Likewise.
	(elf_i386_relocate_section): Likewise.
	(elf_i386_size_dynamic_sections): Set up .iplt and .igot.plt
	sections.
	(elf_i386_finish_dynamic_symbol): When building a static
	executable, use .iplt, .igot.plt and .rel.iplt sections for
	STT_GNU_IFUNC symbols.  Generate R_386_IRELATIVE relocation for
	locally defined STT_GNU_IFUNC symbol.

	* elf64-x86-64.c (x86_64_elf_howto): Add R_X86_64_IRELATIVE.
	(x86_64_reloc_map): Likewise.
	(R_X86_64_standard): Updated.
	(elf64_x86_64_link_hash_table): Add igotplt, iplt and irelplt.
	(elf64_x86_64_link_hash_table_create): Initialize igotplt,
	iplt and irelplt.
	(elf64_x86_64_check_relocs): Handle STT_GNU_IFUNC symbol first.
	(elf64_x86_64_adjust_dynamic_symbol): Likewise.
	(elf64_x86_64_allocate_dynrelocs): Likewise.
	(elf64_x86_64_relocate_section): Likewise.
	(elf64_x86_64_size_dynamic_sections): Set up .iplt and .igot.plt
	sections.
	(elf64_x86_64_finish_dynamic_symbol): When building a static
	executable, use .iplt, .igot.plt and .rela.iplt sections for
	STT_GNU_IFUNC symbols.  Generate R_X86_64_IRELATIVE relocation
	for locally defined STT_GNU_IFUNC symbol.

	* reloc.c (BFD_RELOC_386_IRELATIVE): New.
	(BFD_RELOC_X86_64_IRELATIVE): Likewise.

	* bfd-in2.h: Regenerated.
	* libbfd.h: Likewise.

include/elf/

2009-06-01  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/10205
	* i386.h (R_386_IRELATIVE): New.
	* x86-64.h (R_X86_64_IRELATIVE): Likewise.

ld/testsuite/

2009-06-01  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/10205
	* ld-ifunc/ifunc.exp (contains_irelative_reloc): New.
	Use it on executable and shared library.
	Run *.d.

	* ld-ifunc/lib.c: Add a hidden alias, __GI_library_func2, for
	library_func2.
	(library_func): New.

	* ld-ifunc/ifunc-1-x86.d: New.
	* ld-ifunc/ifunc-1-x86.s: Likewise.
	* ld-ifunc/ifunc-2-i386.d: Likewise.
	* ld-ifunc/ifunc-2-i386.s: Likewise.
	* ld-ifunc/ifunc-2-x86-64.d: Likewise.
	* ld-ifunc/ifunc-2-x86-64.s: Likewise.
	* ld-ifunc/ifunc-3a-x86.d: Likewise.
	* ld-ifunc/ifunc-3b-x86.d: Likewise.
	* ld-ifunc/ifunc-3-x86.s: Likewise.
	* ld-ifunc/ifunc-4-x86.d: Likewise.
	* ld-ifunc/ifunc-4-x86.s: Likewise.
	* ld-ifunc/ifunc-5-i386.d: Likewise.
	* ld-ifunc/ifunc-5-i386.s: Likewise.
	* ld-ifunc/ifunc-5-x86-64.d: Likewise.
	* ld-ifunc/ifunc-5-x86-64.s: Likewise.
This commit is contained in:
H.J. Lu 2009-06-01 13:11:52 +00:00
parent 3aa14d16c6
commit cbe950e9fe
27 changed files with 1102 additions and 155 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
bfd/ChangeLog
View File

@ -1,3 +1,49 @@
2009-06-01 H.J. Lu <hongjiu.lu@intel.com>
PR ld/10205
* elf32-i386.c (elf_howto_table): Add R_386_IRELATIVE.
(elf_i386_reloc_type_lookup): Likewise.
(R_386_tls): Removed.
(R_386_irelative): New.
(R_386_vt_offset): Updated.
(elf_i386_rtype_to_howto): Likewise.
(elf_i386_link_hash_table): Add igotplt, iplt and irelplt.
(elf_i386_link_hash_table_create): Initialize igotplt,
iplt and irelplt.
(elf_i386_check_relocs): Handle STT_GNU_IFUNC symbol first.
(elf_i386_adjust_dynamic_symbol): Likewise.
(elf_i386_allocate_dynrelocs): Likewise.
(elf_i386_relocate_section): Likewise.
(elf_i386_size_dynamic_sections): Set up .iplt and .igot.plt
sections.
(elf_i386_finish_dynamic_symbol): When building a static
executable, use .iplt, .igot.plt and .rel.iplt sections for
STT_GNU_IFUNC symbols. Generate R_386_IRELATIVE relocation for
locally defined STT_GNU_IFUNC symbol.
* elf64-x86-64.c (x86_64_elf_howto): Add R_X86_64_IRELATIVE.
(x86_64_reloc_map): Likewise.
(R_X86_64_standard): Updated.
(elf64_x86_64_link_hash_table): Add igotplt, iplt and irelplt.
(elf64_x86_64_link_hash_table_create): Initialize igotplt,
iplt and irelplt.
(elf64_x86_64_check_relocs): Handle STT_GNU_IFUNC symbol first.
(elf64_x86_64_adjust_dynamic_symbol): Likewise.
(elf64_x86_64_allocate_dynrelocs): Likewise.
(elf64_x86_64_relocate_section): Likewise.
(elf64_x86_64_size_dynamic_sections): Set up .iplt and .igot.plt
sections.
(elf64_x86_64_finish_dynamic_symbol): When building a static
executable, use .iplt, .igot.plt and .rela.iplt sections for
STT_GNU_IFUNC symbols. Generate R_X86_64_IRELATIVE relocation
for locally defined STT_GNU_IFUNC symbol.
* reloc.c (BFD_RELOC_386_IRELATIVE): New.
(BFD_RELOC_X86_64_IRELATIVE): Likewise.
* bfd-in2.h: Regenerated.
* libbfd.h: Likewise.
2009-06-01 H.J. Lu <hongjiu.lu@intel.com>
* elf-bfd.h (struct bfd_elf_section_data): Remove indirect_relocs.

2
bfd/bfd-in2.h
View File

@ -2840,6 +2840,7 @@ relaxation. */
BFD_RELOC_386_TLS_GOTDESC,
BFD_RELOC_386_TLS_DESC_CALL,
BFD_RELOC_386_TLS_DESC,
BFD_RELOC_386_IRELATIVE,
/* x86-64/elf relocations */
BFD_RELOC_X86_64_GOT32,
@ -2868,6 +2869,7 @@ relaxation. */
BFD_RELOC_X86_64_GOTPC32_TLSDESC,
BFD_RELOC_X86_64_TLSDESC_CALL,
BFD_RELOC_X86_64_TLSDESC,
BFD_RELOC_X86_64_IRELATIVE,
/* ns32k relocations */
BFD_RELOC_NS32K_IMM_8,

442
bfd/elf32-i386.c
View File

@ -138,10 +138,13 @@ static reloc_howto_type elf_howto_table[]=
HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_386_TLS_DESC",
TRUE, 0xffffffff, 0xffffffff, FALSE),
HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_386_IRELATIVE",
TRUE, 0xffffffff, 0xffffffff, FALSE),
/* Another gap. */
#define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset)
#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
#define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
/* GNU extension to record C++ vtable hierarchy. */
HOWTO (R_386_GNU_VTINHERIT, /* type */
@ -316,6 +319,10 @@ elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
TRACE ("BFD_RELOC_386_TLS_DESC");
return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
case BFD_RELOC_386_IRELATIVE:
TRACE ("BFD_RELOC_386_IRELATIVE");
return &elf_howto_table[R_386_IRELATIVE];
case BFD_RELOC_VTABLE_INHERIT:
TRACE ("BFD_RELOC_VTABLE_INHERIT");
return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
@ -355,9 +362,9 @@ elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
&& ((indx = r_type - R_386_ext_offset) - R_386_standard
>= R_386_ext - R_386_standard)
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
>= R_386_tls - R_386_ext)
&& ((indx = r_type - R_386_vt_offset) - R_386_tls
>= R_386_vt - R_386_tls))
>= R_386_irelative - R_386_ext)
&& ((indx = r_type - R_386_vt_offset) - R_386_irelative
>= R_386_vt - R_386_irelative))
{
(*_bfd_error_handler) (_("%B: invalid relocation type %d"),
abfd, (int) r_type);
@ -668,6 +675,9 @@ struct elf_i386_link_hash_table
asection *srelplt;
asection *sdynbss;
asection *srelbss;
asection *igotplt;
asection *iplt;
asection *irelplt;
/* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
asection *srelplt2;
@ -764,6 +774,9 @@ elf_i386_link_hash_table_create (bfd *abfd)
ret->srelplt = NULL;
ret->sdynbss = NULL;
ret->srelbss = NULL;
ret->igotplt= NULL;
ret->iplt = NULL;
ret->irelplt= NULL;
ret->tls_ldm_got.refcount = 0;
ret->next_tls_desc_index = 0;
ret->sgotplt_jump_table_size = 0;
@ -1251,6 +1264,87 @@ elf_i386_check_relocs (bfd *abfd,
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;
/* Create the ifunc sections for static executables. If we
never see an indirect function symbol nor we are building
a static executable, those sections will be empty and
won't appear in output. */
switch (r_type)
{
default:
break;
case R_386_32:
case R_386_PC32:
case R_386_PLT32:
case R_386_GOT32:
case R_386_GOTOFF:
if (!info->shared && htab->iplt == NULL)
{
if (!_bfd_elf_create_static_ifunc_sections (abfd,
info))
return FALSE;
htab->iplt = bfd_get_section_by_name (abfd, ".iplt");
htab->irelplt = bfd_get_section_by_name (abfd,
".rel.iplt");
htab->igotplt = bfd_get_section_by_name (abfd,
".igot.plt");
if (!htab->iplt
|| !htab->irelplt
|| !htab->igotplt)
abort ();
}
break;
}
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle
it here if it is defined in a non-shared object. */
if (h->type == STT_GNU_IFUNC
&& h->def_regular)
{
/* It is referenced by a non-shared object. */
h->ref_regular = 1;
/* STT_GNU_IFUNC symbol must go through PLT. */
h->plt.refcount += 1;
/* STT_GNU_IFUNC needs dynamic sections. */
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
switch (r_type)
{
default:
(*_bfd_error_handler)
(_("%B: relocation %s against STT_GNU_IFUNC "
"symbol `%s' isn't handled by %s"), abfd,
elf_howto_table[r_type].name,
h->root.root.string, __FUNCTION__);
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_386_32:
case R_386_PC32:
h->non_got_ref = 1;
if (r_type != R_386_PC32)
h->pointer_equality_needed = 1;
break;
case R_386_PLT32:
break;
case R_386_GOT32:
case R_386_GOTOFF:
if (htab->sgot == NULL
&& !elf_i386_create_got_section (htab->elf.dynobj,
info))
return FALSE;
break;
}
continue;
}
}
if (! elf_i386_tls_transition (info, abfd, sec, NULL,
@ -1474,12 +1568,6 @@ elf_i386_check_relocs (bfd *abfd,
if (sreloc == NULL)
return FALSE;
/* Create the ifunc section as well, even if we have not encountered a
indirect function symbol yet. We may not even see one in the input
object file, but we can still encounter them in libraries. */
(void) _bfd_elf_make_ifunc_reloc_section
(abfd, sec, htab->elf.dynobj, 2);
}
/* If this is a global symbol, we count the number of
@ -1689,6 +1777,17 @@ elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
struct elf_i386_link_hash_table *htab;
asection *s;
/* STT_GNU_IFUNC symbol must go through PLT. */
if (h->type == STT_GNU_IFUNC)
{
if (h->plt.refcount <= 0)
{
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
}
return TRUE;
}
/* 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. */
@ -1822,7 +1921,6 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
struct elf_i386_link_hash_table *htab;
struct elf_i386_link_hash_entry *eh;
struct elf_i386_dyn_relocs *p;
bfd_boolean use_indirect_section = FALSE;
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
@ -1832,12 +1930,80 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
entry in the hash table, thus we never get to see the real
symbol in a hash traversal. So look at it now. */
h = (struct elf_link_hash_entry *) h->root.u.i.link;
eh = (struct elf_i386_link_hash_entry *) h;
info = (struct bfd_link_info *) inf;
htab = elf_i386_hash_table (info);
if (htab->elf.dynamic_sections_created
&& h->plt.refcount > 0)
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
here if it is defined and referenced in a non-shared object. */
if (h->type == STT_GNU_IFUNC
&& h->def_regular)
{
asection *plt, *gotplt, *relplt;
/* Return and discard space for dynamic relocations against it if
it is never referenced in a non-shared object. */
if (!h->ref_regular)
{
if (h->plt.refcount > 0
|| h->got.refcount > 0)
abort ();
h->got.offset = (bfd_vma) -1;
eh->dyn_relocs = NULL;
return TRUE;
}
if (h->plt.refcount <= 0)
abort ();
/* When building a static executable, use .iplt, .igot.plt and
.rel.iplt sections for STT_GNU_IFUNC symbols. */
if (htab->splt != 0)
{
plt = htab->splt;
gotplt = htab->sgotplt;
relplt = htab->srelplt;
/* If this is the first .plt entry, make room for the special
first entry. */
if (plt->size == 0)
plt->size += PLT_ENTRY_SIZE;
}
else
{
plt = htab->iplt;
gotplt = htab->igotplt;
relplt = htab->irelplt;
}
/* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
the original value for R_386_IRELATIVE. */
h->plt.offset = plt->size;
/* Make room for this entry in the .plt/.iplt section. */
plt->size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .got.plt/.got.iplt
section, which will be placed in the .got section by the
linker script. */
gotplt->size += 4;
/* We also need to make an entry in the .rela.plt/.rela.iplt
section. */
relplt->size += sizeof (Elf32_External_Rel);
relplt->reloc_count++;
/* No need for dynamic relocation for local STT_GNU_IFUNC symbol.
Discard space for relocations against it. */
if (h->dynindx == -1 || h->forced_local)
eh->dyn_relocs = NULL;
/* STT_GNU_IFUNC symbol uses .got.plt, not .got. */
h->got.refcount = 0;
}
else if (htab->elf.dynamic_sections_created
&& h->plt.refcount > 0)
{
/* Make sure this symbol is output as a dynamic symbol.
Undefined weak syms won't yet be marked as dynamic. */
@ -1915,7 +2081,6 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
h->needs_plt = 0;
}
eh = (struct elf_i386_link_hash_entry *) h;
eh->tlsdesc_got = (bfd_vma) -1;
/* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
@ -2044,16 +2209,6 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
}
}
}
else if (_bfd_elf_is_ifunc_symbol (info->output_bfd, h)
&& h->dynindx == -1
&& ! h->forced_local)
{
if (bfd_elf_link_record_dynamic_symbol (info, h)
&& h->dynindx != -1)
use_indirect_section = TRUE;
else
return FALSE;
}
else if (ELIMINATE_COPY_RELOCS)
{
/* For the non-shared case, discard space for relocs against
@ -2092,10 +2247,7 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
{
asection *sreloc;
if (use_indirect_section)
sreloc = elf_section_data (p->sec)->indirect_relocs;
else
sreloc = elf_section_data (p->sec)->sreloc;
sreloc = elf_section_data (p->sec)->sreloc;
BFD_ASSERT (sreloc != NULL);
sreloc->size += p->count * sizeof (Elf32_External_Rel);
@ -2299,6 +2451,8 @@ elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
if (s == htab->splt
|| s == htab->sgot
|| s == htab->sgotplt
|| s == htab->iplt
|| s == htab->igotplt
|| s == htab->sdynbss)
{
/* Strip this section if we don't need it; see the
@ -2589,7 +2743,7 @@ elf_i386_relocate_section (bfd *output_bfd,
&& ((indx = r_type - R_386_ext_offset) - R_386_standard
>= R_386_ext - R_386_standard)
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
>= R_386_tls - R_386_ext))
>= R_386_irelative - R_386_ext))
{
(*_bfd_error_handler)
(_("%B: unrecognized relocation (0x%x) in section `%A'"),
@ -2706,6 +2860,113 @@ elf_i386_relocate_section (bfd *output_bfd,
if (info->relocatable)
continue;
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle
it here if it is defined in a non-shared object. */
if (h != NULL
&& h->type == STT_GNU_IFUNC
&& h->def_regular)
{
asection *plt, *gotplt, *base_got;
bfd_vma plt_index;
if ((input_section->flags & SEC_ALLOC) == 0
|| h->plt.offset == (bfd_vma) -1)
abort ();
/* STT_GNU_IFUNC symbol must go through PLT. */
if (htab->splt != NULL)
{
plt = htab->splt;
gotplt = htab->sgotplt;
}
else
{
plt = htab->iplt;
gotplt = htab->igotplt;
}
relocation = (plt->output_section->vma
+ plt->output_offset + h->plt.offset);
switch (r_type)
{
default:
(*_bfd_error_handler)
(_("%B: relocation %s against STT_GNU_IFUNC "
"symbol `%s' isn't handled by %s"), input_bfd,
elf_howto_table[r_type].name,
h->root.root.string, __FUNCTION__);
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_386_32:
case R_386_PC32:
case R_386_PLT32:
goto do_relocation;
case R_386_GOT32:
base_got = htab->sgot;
off = h->got.offset;
if (base_got == NULL
|| off != (bfd_vma) -1)
abort ();
/* We can't use h->got.offset here to save state, or
even just remember the offset, as finish_dynamic_symbol
would use that as offset into .got. */
if (htab->splt != NULL)
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
off = (plt_index + 3) * 4;
base_got = htab->sgotplt;
}
else
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE;
off = plt_index * 4;
base_got = htab->igotplt;
}
if (h->dynindx == -1
|| h->forced_local
|| info->symbolic)
{
/* This references the local defitionion. We must
initialize this entry in the global offset table.
Since the offset must always be a multiple of 8, 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,
base_got->contents + off);
h->got.offset |= 1;
}
}
relocation = off;
/* Adjust for static executables. */
if (htab->splt == NULL)
relocation += gotplt->output_offset;
goto do_relocation;
case R_386_GOTOFF:
relocation -= (gotplt->output_section->vma
+ gotplt->output_offset);
goto do_relocation;
}
}
switch (r_type)
{
case R_386_GOT32:
@ -2899,12 +3160,6 @@ elf_i386_relocate_section (bfd *output_bfd,
|| h->root.type != bfd_link_hash_undefweak)
&& (r_type != R_386_PC32
|| !SYMBOL_CALLS_LOCAL (info, h)))
|| (! info->shared
&& h != NULL
&& h->dynindx != -1
&& ! h->forced_local
&& ((struct elf_i386_link_hash_entry *) h)->dyn_relocs != NULL
&& _bfd_elf_is_ifunc_symbol (output_bfd, h))
|| (ELIMINATE_COPY_RELOCS
&& !info->shared
&& h != NULL
@ -2953,16 +3208,7 @@ elf_i386_relocate_section (bfd *output_bfd,
outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
}
if (! info->shared
&& h != NULL
&& h->dynindx != -1
&& ! h->forced_local
&& _bfd_elf_is_ifunc_symbol (output_bfd, h)
&& elf_section_data (input_section)->indirect_relocs != NULL
&& elf_section_data (input_section)->indirect_relocs->contents != NULL)
sreloc = elf_section_data (input_section)->indirect_relocs;
else
sreloc = elf_section_data (input_section)->sreloc;
sreloc = elf_section_data (input_section)->sreloc;
BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
@ -3605,6 +3851,7 @@ elf_i386_relocate_section (bfd *output_bfd,
return FALSE;
}
do_relocation:
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, 0);
@ -3667,37 +3914,67 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd,
bfd_vma got_offset;
Elf_Internal_Rela rel;
bfd_byte *loc;
asection *plt, *gotplt, *relplt;
/* When building a static executable, use .iplt, .igot.plt and
.rel.iplt sections for STT_GNU_IFUNC symbols. */
if (htab->splt != 0)
{
plt = htab->splt;
gotplt = htab->sgotplt;
relplt = htab->srelplt;
}
else
{
plt = htab->iplt;
gotplt = htab->igotplt;
relplt = htab->irelplt;
}
/* This symbol has an entry in the procedure linkage table. Set
it up. */
if (h->dynindx == -1
|| htab->splt == NULL
|| htab->sgotplt == NULL
|| htab->srelplt == NULL)
if ((h->dynindx == -1
&& !((h->forced_local || info->executable)
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
|| plt == NULL
|| gotplt == NULL
|| relplt == NULL)
abort ();
/* Get the index in the procedure linkage table which
corresponds to this symbol. This is the index of this symbol
in all the symbols for which we are making plt entries. The
first entry in the procedure linkage table is reserved. */
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
first entry in the procedure linkage table is reserved.
/* Get the offset into the .got table of the entry that
Get the offset into the .got table of the entry that
corresponds to this function. Each .got entry is 4 bytes.
The first three are reserved. */
got_offset = (plt_index + 3) * 4;
The first three are reserved.
For static executables, we don't reserve anything. */
if (plt == htab->splt)
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
got_offset = (plt_index + 3) * 4;
}
else
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE;
got_offset = plt_index * 4;
}
/* Fill in the entry in the procedure linkage table. */
if (! info->shared)
{
memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
PLT_ENTRY_SIZE);
bfd_put_32 (output_bfd,
(htab->sgotplt->output_section->vma
+ htab->sgotplt->output_offset
(gotplt->output_section->vma
+ gotplt->output_offset
+ got_offset),
htab->splt->contents + h->plt.offset + 2);
plt->contents + h->plt.offset + 2);
if (htab->is_vxworks)
{
@ -3737,31 +4014,52 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd,
}
else
{
memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
PLT_ENTRY_SIZE);
bfd_put_32 (output_bfd, got_offset,
htab->splt->contents + h->plt.offset + 2);
plt->contents + h->plt.offset + 2);
}
bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
htab->splt->contents + h->plt.offset + 7);
bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
htab->splt->contents + h->plt.offset + 12);
/* Don't fill PLT entry for static executables. */
if (plt == htab->splt)
{
bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
plt->contents + h->plt.offset + 7);
bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
plt->contents + h->plt.offset + 12);
}
/* Fill in the entry in the global offset table. */
bfd_put_32 (output_bfd,
(htab->splt->output_section->vma
+ htab->splt->output_offset
(plt->output_section->vma
+ plt->output_offset
+ h->plt.offset
+ 6),
htab->sgotplt->contents + got_offset);
gotplt->contents + got_offset);
/* Fill in the entry in the .rel.plt section. */
rel.r_offset = (htab->sgotplt->output_section->vma
+ htab->sgotplt->output_offset
rel.r_offset = (gotplt->output_section->vma
+ gotplt->output_offset
+ got_offset);
rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
if (h->dynindx == -1
|| ((info->executable
|| ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
{
/* If an STT_GNU_IFUNC symbol is locally defined, generate
R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
in the .got.plt section. */
bfd_put_32 (output_bfd,
(h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset),
gotplt->contents + got_offset);
rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
}
else
rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
if (!h->def_regular)

452
bfd/elf64-x86-64.c
View File

@ -143,12 +143,15 @@ static reloc_howto_type x86_64_elf_howto_table[] =
complain_overflow_bitfield, bfd_elf_generic_reloc,
"R_X86_64_TLSDESC",
FALSE, MINUS_ONE, MINUS_ONE, FALSE),
HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
/* We have a gap in the reloc numbers here.
R_X86_64_standard counts the number up to this point, and
R_X86_64_vt_offset is the value to subtract from a reloc type of
R_X86_64_GNU_VT* to form an index into this table. */
#define R_X86_64_standard (R_X86_64_TLSDESC + 1)
#define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
/* GNU extension to record C++ vtable hierarchy. */
@ -211,6 +214,7 @@ static const struct elf_reloc_map x86_64_reloc_map[] =
{ BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
{ BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
{ BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
{ BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
{ BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
{ BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
};
@ -489,6 +493,9 @@ struct elf64_x86_64_link_hash_table
asection *srelplt;
asection *sdynbss;
asection *srelbss;
asection *igotplt;
asection *iplt;
asection *irelplt;
/* The offset into splt of the PLT entry for the TLS descriptor
resolver. Special values are 0, if not necessary (or not found
@ -581,6 +588,9 @@ elf64_x86_64_link_hash_table_create (bfd *abfd)
ret->srelplt = NULL;
ret->sdynbss = NULL;
ret->srelbss = NULL;
ret->igotplt= NULL;
ret->iplt = NULL;
ret->irelplt= NULL;
ret->sym_sec.abfd = NULL;
ret->tlsdesc_plt = 0;
ret->tlsdesc_got = 0;
@ -1011,7 +1021,7 @@ elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
sym_hashes = elf_sym_hashes (abfd);
sreloc = NULL;
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
@ -1037,6 +1047,94 @@ elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
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;
/* Create the ifunc sections for static executables. If we
never see an indirect function symbol nor we are building
a static executable, those sections will be empty and
won't appear in output. */
switch (r_type)
{
default:
break;
case R_X86_64_32S:
case R_X86_64_32:
case R_X86_64_64:
case R_X86_64_PC32:
case R_X86_64_PC64:
case R_X86_64_PLT32:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCREL64:
if (!info->shared && htab->iplt == NULL)
{
if (!_bfd_elf_create_static_ifunc_sections (abfd,
info))
return FALSE;
htab->iplt = bfd_get_section_by_name (abfd, ".iplt");
htab->irelplt = bfd_get_section_by_name (abfd,
".rela.iplt");
htab->igotplt = bfd_get_section_by_name (abfd,
".igot.plt");
if (!htab->iplt
|| !htab->irelplt
|| !htab->igotplt)
abort ();
}
break;
}
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle
it here if it is defined in a non-shared object. */
if (h->type == STT_GNU_IFUNC
&& h->def_regular)
{
/* It is referenced by a non-shared object. */
h->ref_regular = 1;
/* STT_GNU_IFUNC symbol must go through PLT. */
h->plt.refcount += 1;
/* STT_GNU_IFUNC needs dynamic sections. */
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
switch (r_type)
{
default:
(*_bfd_error_handler)
(_("%B: relocation %s against STT_GNU_IFUNC "
"symbol `%s' isn't handled by %s"), abfd,
x86_64_elf_howto_table[r_type].name,
h->root.root.string, __FUNCTION__);
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_X86_64_32S:
case R_X86_64_32:
case R_X86_64_64:
case R_X86_64_PC32:
case R_X86_64_PC64:
h->non_got_ref = 1;
if (r_type != R_X86_64_PC32
&& r_type != R_X86_64_PC64)
h->pointer_equality_needed = 1;
break;
case R_X86_64_PLT32:
break;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCREL64:
if (htab->sgot == NULL
&& !elf64_x86_64_create_got_section (htab->elf.dynobj,
info))
return FALSE;
break;
}
continue;
}
}
if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
@ -1298,12 +1396,6 @@ elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
if (sreloc == NULL)
return FALSE;
/* Create the ifunc section, even if we will not encounter an
indirect function symbol. We may not even see one in the input
object file, but we can still encounter them in libraries. */
(void) _bfd_elf_make_ifunc_reloc_section
(abfd, sec, htab->elf.dynobj, 2);
}
/* If this is a global symbol, we count the number of
@ -1528,6 +1620,17 @@ elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
struct elf64_x86_64_link_hash_table *htab;
asection *s;
/* STT_GNU_IFUNC symbol must go through PLT. */
if (h->type == STT_GNU_IFUNC)
{
if (h->plt.refcount <= 0)
{
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
}
return TRUE;
}
/* 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. */
@ -1659,19 +1762,86 @@ elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
struct elf64_x86_64_link_hash_table *htab;
struct elf64_x86_64_link_hash_entry *eh;
struct elf64_x86_64_dyn_relocs *p;
bfd_boolean use_indirect_section = FALSE;
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
if (h->root.type == bfd_link_hash_warning)
h = (struct elf_link_hash_entry *) h->root.u.i.link;
eh = (struct elf64_x86_64_link_hash_entry *) h;
info = (struct bfd_link_info *) inf;
htab = elf64_x86_64_hash_table (info);
if (htab->elf.dynamic_sections_created
&& h->plt.refcount > 0)
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
here if it is defined and referenced in a non-shared object. */
if (h->type == STT_GNU_IFUNC
&& h->def_regular)
{
asection *plt, *gotplt, *relplt;
/* Return and discard space for dynamic relocations against it if
it is never referenced in a non-shared object. */
if (!h->ref_regular)
{
if (h->plt.refcount > 0
|| h->got.refcount > 0)
abort ();
h->got.offset = (bfd_vma) -1;
eh->dyn_relocs = NULL;
return TRUE;
}
if (h->plt.refcount <= 0)
abort ();
/* When building a static executable, use .iplt, .igot.plt and
.rela.iplt sections for STT_GNU_IFUNC symbols. */
if (htab->splt != 0)
{
plt = htab->splt;
gotplt = htab->sgotplt;
relplt = htab->srelplt;
/* If this is the first .plt entry, make room for the special
first entry. */
if (plt->size == 0)
plt->size += PLT_ENTRY_SIZE;
}
else
{
plt = htab->iplt;
gotplt = htab->igotplt;
relplt = htab->irelplt;
}
/* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
the original value for R_X86_64_IRELATIVE. */
h->plt.offset = plt->size;
/* Make room for this entry in the .plt/.iplt section. */
plt->size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .got.plt/.got.iplt
section, which will be placed in the .got section by the
linker script. */
gotplt->size += GOT_ENTRY_SIZE;
/* We also need to make an entry in the .rela.plt/.rela.iplt
section. */
relplt->size += sizeof (Elf64_External_Rela);
relplt->reloc_count++;
/* No need for dynamic relocation for local STT_GNU_IFUNC symbol.
Discard space for relocations against it. */
if (h->dynindx == -1 || h->forced_local)
eh->dyn_relocs = NULL;
/* STT_GNU_IFUNC symbol uses .got.plt, not .got. */
h->got.refcount = 0;
}
else if (htab->elf.dynamic_sections_created
&& h->plt.refcount > 0)
{
/* Make sure this symbol is output as a dynamic symbol.
Undefined weak syms won't yet be marked as dynamic. */
@ -1729,7 +1899,6 @@ elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
h->needs_plt = 0;
}
eh = (struct elf64_x86_64_link_hash_entry *) h;
eh->tlsdesc_got = (bfd_vma) -1;
/* If R_X86_64_GOTTPOFF symbol is now local to the binary,
@ -1843,16 +2012,7 @@ elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
&& ! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
}
else if (_bfd_elf_is_ifunc_symbol (info->output_bfd, h)
&& h->dynindx == -1
&& ! h->forced_local)
{
if (bfd_elf_link_record_dynamic_symbol (info, h)
&& h->dynindx != -1)
use_indirect_section = TRUE;
else
return FALSE;
}
else if (ELIMINATE_COPY_RELOCS)
{
@ -1890,10 +2050,7 @@ elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
{
asection * sreloc;
if (use_indirect_section)
sreloc = elf_section_data (p->sec)->indirect_relocs;
else
sreloc = elf_section_data (p->sec)->sreloc;
sreloc = elf_section_data (p->sec)->sreloc;
BFD_ASSERT (sreloc != NULL);
@ -2110,6 +2267,8 @@ elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
if (s == htab->splt
|| s == htab->sgot
|| s == htab->sgotplt
|| s == htab->iplt
|| s == htab->igotplt
|| s == htab->sdynbss)
{
/* Strip this section if we don't need it; see the
@ -2362,6 +2521,7 @@ elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
bfd_boolean unresolved_reloc;
bfd_reloc_status_type r;
int tls_type;
asection *base_got;
r_type = ELF64_R_TYPE (rel->r_info);
if (r_type == (int) R_X86_64_GNU_VTINHERIT
@ -2411,11 +2571,120 @@ elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
if (info->relocatable)
continue;
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle
it here if it is defined in a non-shared object. */
if (h != NULL
&& h->type == STT_GNU_IFUNC
&& h->def_regular)
{
asection *plt;
bfd_vma plt_index;
if ((input_section->flags & SEC_ALLOC) == 0
|| h->plt.offset == (bfd_vma) -1)
abort ();
/* STT_GNU_IFUNC symbol must go through PLT. */
plt = htab->splt ? htab->splt : htab->iplt;
relocation = (plt->output_section->vma
+ plt->output_offset + h->plt.offset);
switch (r_type)
{
default:
(*_bfd_error_handler)
(_("%B: relocation %s against STT_GNU_IFUNC "
"symbol `%s' isn't handled by %s"), input_bfd,
x86_64_elf_howto_table[r_type].name,
h->root.root.string, __FUNCTION__);
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_X86_64_32S:
if (!info->executable)
abort ();
case R_X86_64_32:
case R_X86_64_64:
case R_X86_64_PC32:
case R_X86_64_PC64:
case R_X86_64_PLT32:
goto do_relocation;
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCREL64:
base_got = htab->sgot;
off = h->got.offset;
if (base_got == NULL
|| off != (bfd_vma) -1)
abort ();
/* We can't use h->got.offset here to save state, or
even just remember the offset, as finish_dynamic_symbol
would use that as offset into .got. */
if (htab->splt != NULL)
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
off = (plt_index + 3) * GOT_ENTRY_SIZE;
base_got = htab->sgotplt;
}
else
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE;
off = plt_index * GOT_ENTRY_SIZE;
base_got = htab->igotplt;
}
if (h->dynindx == -1
|| h->forced_local
|| info->symbolic)
{
/* This references the local defitionion. We must
initialize this entry in the global offset table.
Since the offset must always be a multiple of 8, 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_64 (output_bfd, relocation,
base_got->contents + off);
/* Note that this is harmless for the GOTPLT64 case,
as -1 | 1 still is -1. */
h->got.offset |= 1;
}
}
relocation = (base_got->output_section->vma
+ base_got->output_offset + off);
if (r_type != R_X86_64_GOTPCREL
&& r_type != R_X86_64_GOTPCREL64)
{
asection *gotplt;
if (htab->splt != NULL)
gotplt = htab->sgotplt;
else
gotplt = htab->igotplt;
relocation -= (gotplt->output_section->vma
- gotplt->output_offset);
}
goto do_relocation;
}
}
/* When generating a shared object, the relocations handled here are
copied into the output file to be resolved at run time. */
switch (r_type)
{
asection *base_got;
case R_X86_64_GOT32:
case R_X86_64_GOT64:
/* Relocation is to the entry for this symbol in the global
@ -2700,12 +2969,6 @@ elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
|| h->root.type != bfd_link_hash_undefweak)
&& (! IS_X86_64_PCREL_TYPE (r_type)
|| ! SYMBOL_CALLS_LOCAL (info, h)))
|| (! info->shared
&& h != NULL
&& h->dynindx != -1
&& ! h->forced_local
&& ((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs != NULL
&& _bfd_elf_is_ifunc_symbol (output_bfd, h))
|| (ELIMINATE_COPY_RELOCS
&& !info->shared
&& h != NULL
@ -2797,16 +3060,7 @@ elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
}
}
if (! info->shared
&& h != NULL
&& h->dynindx != -1
&& ! h->forced_local
&& _bfd_elf_is_ifunc_symbol (output_bfd, h)
&& elf_section_data (input_section)->indirect_relocs != NULL
&& elf_section_data (input_section)->indirect_relocs->contents != NULL)
sreloc = elf_section_data (input_section)->indirect_relocs;
else
sreloc = elf_section_data (input_section)->sreloc;
sreloc = elf_section_data (input_section)->sreloc;
BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
@ -3253,6 +3507,7 @@ elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
howto->name,
h->root.root.string);
do_relocation:
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, rel->r_addend);
@ -3315,28 +3570,58 @@ elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
bfd_vma got_offset;
Elf_Internal_Rela rela;
bfd_byte *loc;
asection *plt, *gotplt, *relplt;
/* When building a static executable, use .iplt, .igot.plt and
.rela.iplt sections for STT_GNU_IFUNC symbols. */
if (htab->splt != 0)
{
plt = htab->splt;
gotplt = htab->sgotplt;
relplt = htab->srelplt;
}
else
{
plt = htab->iplt;
gotplt = htab->igotplt;
relplt = htab->irelplt;
}
/* This symbol has an entry in the procedure linkage table. Set
it up. */
if (h->dynindx == -1
|| htab->splt == NULL
|| htab->sgotplt == NULL
|| htab->srelplt == NULL)
if ((h->dynindx == -1
&& !((h->forced_local || info->executable)
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
|| plt == NULL
|| gotplt == NULL
|| relplt == NULL)
abort ();
/* Get the index in the procedure linkage table which
corresponds to this symbol. This is the index of this symbol
in all the symbols for which we are making plt entries. The
first entry in the procedure linkage table is reserved. */
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
/* Get the offset into the .got table of the entry that
first entry in the procedure linkage table is reserved.
Get the offset into the .got table of the entry that
corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
bytes. The first three are reserved for the dynamic linker. */
got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
bytes. The first three are reserved for the dynamic linker.
For static executables, we don't reserve anything. */
if (plt == htab->splt)
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
}
else
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE;
got_offset = plt_index * GOT_ENTRY_SIZE;
}
/* Fill in the entry in the procedure linkage table. */
memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
PLT_ENTRY_SIZE);
/* Insert the relocation positions of the plt section. The magic
@ -3345,35 +3630,56 @@ elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
/* Put offset for jmp *name@GOTPCREL(%rip), since the
instruction uses 6 bytes, subtract this value. */
bfd_put_32 (output_bfd,
(htab->sgotplt->output_section->vma
+ htab->sgotplt->output_offset
(gotplt->output_section->vma
+ gotplt->output_offset
+ got_offset
- htab->splt->output_section->vma
- htab->splt->output_offset
- plt->output_section->vma
- plt->output_offset
- h->plt.offset
- 6),
htab->splt->contents + h->plt.offset + 2);
/* Put relocation index. */
bfd_put_32 (output_bfd, plt_index,
htab->splt->contents + h->plt.offset + 7);
/* Put offset for jmp .PLT0. */
bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
htab->splt->contents + h->plt.offset + 12);
plt->contents + h->plt.offset + 2);
/* Don't fill PLT entry for static executables. */
if (plt == htab->splt)
{
/* Put relocation index. */
bfd_put_32 (output_bfd, plt_index,
plt->contents + h->plt.offset + 7);
/* Put offset for jmp .PLT0. */
bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
plt->contents + h->plt.offset + 12);
}
/* Fill in the entry in the global offset table, initially this
points to the pushq instruction in the PLT which is at offset 6. */
bfd_put_64 (output_bfd, (htab->splt->output_section->vma
+ htab->splt->output_offset
bfd_put_64 (output_bfd, (plt->output_section->vma
+ plt->output_offset
+ h->plt.offset + 6),
htab->sgotplt->contents + got_offset);
gotplt->contents + got_offset);
/* Fill in the entry in the .rela.plt section. */
rela.r_offset = (htab->sgotplt->output_section->vma
+ htab->sgotplt->output_offset
rela.r_offset = (gotplt->output_section->vma
+ gotplt->output_offset
+ got_offset);
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
rela.r_addend = 0;
loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
if (h->dynindx == -1
|| ((info->executable
|| ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
{
/* If an STT_GNU_IFUNC symbol is locally defined, generate
R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
rela.r_addend = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
}
else
{
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
rela.r_addend = 0;
}
loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
if (!h->def_regular)

2
bfd/libbfd.h
View File

@ -1104,6 +1104,7 @@ static const char *const bfd_reloc_code_real_names[] = { "@@uninitialized@@",
"BFD_RELOC_386_TLS_GOTDESC",
"BFD_RELOC_386_TLS_DESC_CALL",
"BFD_RELOC_386_TLS_DESC",
"BFD_RELOC_386_IRELATIVE",
"BFD_RELOC_X86_64_GOT32",
"BFD_RELOC_X86_64_PLT32",
"BFD_RELOC_X86_64_COPY",
@ -1130,6 +1131,7 @@ static const char *const bfd_reloc_code_real_names[] = { "@@uninitialized@@",
"BFD_RELOC_X86_64_GOTPC32_TLSDESC",
"BFD_RELOC_X86_64_TLSDESC_CALL",
"BFD_RELOC_X86_64_TLSDESC",
"BFD_RELOC_X86_64_IRELATIVE",
"BFD_RELOC_NS32K_IMM_8",
"BFD_RELOC_NS32K_IMM_16",
"BFD_RELOC_NS32K_IMM_32",

4
bfd/reloc.c
View File

@ -2492,6 +2492,8 @@ ENUMX
BFD_RELOC_386_TLS_DESC_CALL
ENUMX
BFD_RELOC_386_TLS_DESC
ENUMX
BFD_RELOC_386_IRELATIVE
ENUMDOC
i386/elf relocations
@ -2547,6 +2549,8 @@ ENUMX
BFD_RELOC_X86_64_TLSDESC_CALL
ENUMX
BFD_RELOC_X86_64_TLSDESC
ENUMX
BFD_RELOC_X86_64_IRELATIVE
ENUMDOC
x86-64/elf relocations

6
include/elf/ChangeLog
View File

@ -1,3 +1,9 @@
2009-06-01 H.J. Lu <hongjiu.lu@intel.com>
PR ld/10205
* i386.h (R_386_IRELATIVE): New.
* x86-64.h (R_X86_64_IRELATIVE): Likewise.
2009-05-27 H.J. Lu <hongjiu.lu@intel.com>
* common.h: Update comments for dynamic tag ranges.

1
include/elf/i386.h
View File

@ -66,6 +66,7 @@ START_RELOC_NUMBERS (elf_i386_reloc_type)
RELOC_NUMBER (R_386_TLS_GOTDESC, 39)
RELOC_NUMBER (R_386_TLS_DESC_CALL,40)
RELOC_NUMBER (R_386_TLS_DESC, 41)
RELOC_NUMBER (R_386_IRELATIVE, 42) /* Adjust indirectly by program base */
/* Used by Intel. */
RELOC_NUMBER (R_386_USED_BY_INTEL_200, 200)

1
include/elf/x86-64.h
View File

@ -71,6 +71,7 @@ START_RELOC_NUMBERS (elf_x86_64_reloc_type)
RELOC_NUMBER (R_X86_64_TLSDESC_CALL, 35) /* Relaxable call through TLS
descriptor. */
RELOC_NUMBER (R_X86_64_TLSDESC, 36) /* 2x64-bit TLS descriptor. */
RELOC_NUMBER (R_X86_64_IRELATIVE, 37) /* Adjust indirectly by program base */
RELOC_NUMBER (R_X86_64_GNU_VTINHERIT, 250) /* GNU C++ hack */
RELOC_NUMBER (R_X86_64_GNU_VTENTRY, 251) /* GNU C++ hack */
END_RELOC_NUMBERS (R_X86_64_max)

27
ld/testsuite/ChangeLog
View File

@ -1,3 +1,30 @@
2009-06-01 H.J. Lu <hongjiu.lu@intel.com>
PR ld/10205
* ld-ifunc/ifunc.exp (contains_irelative_reloc): New.
Use it on executable and shared library.
Run *.d.
* ld-ifunc/lib.c: Add a hidden alias, __GI_library_func2, for
library_func2.
(library_func): New.
* ld-ifunc/ifunc-1-x86.d: New.
* ld-ifunc/ifunc-1-x86.s: Likewise.
* ld-ifunc/ifunc-2-i386.d: Likewise.
* ld-ifunc/ifunc-2-i386.s: Likewise.
* ld-ifunc/ifunc-2-x86-64.d: Likewise.
* ld-ifunc/ifunc-2-x86-64.s: Likewise.
* ld-ifunc/ifunc-3a-x86.d: Likewise.
* ld-ifunc/ifunc-3b-x86.d: Likewise.
* ld-ifunc/ifunc-3-x86.s: Likewise.
* ld-ifunc/ifunc-4-x86.d: Likewise.
* ld-ifunc/ifunc-4-x86.s: Likewise.
* ld-ifunc/ifunc-5-i386.d: Likewise.
* ld-ifunc/ifunc-5-i386.s: Likewise.
* ld-ifunc/ifunc-5-x86-64.d: Likewise.
* ld-ifunc/ifunc-5-x86-64.s: Likewise.
2009-05-27 Dave Korn <dave.korn.cygwin@gmail.com>
* ld-pe/non-c-lang-syms.c: New dump test source file.

7
ld/testsuite/ld-ifunc/ifunc-1-x86.d Normal file
View File

@ -0,0 +1,7 @@
#ld: -shared
#objdump: -dw
#target: x86_64-*-* i?86-*-*
#...
[ \t0-9a-f]+:[ \t0-9a-f]+call[ \t0-9a-fq]+<\*ABS\*@plt>
#pass

16
ld/testsuite/ld-ifunc/ifunc-1-x86.s Normal file
View File

@ -0,0 +1,16 @@
.type foo, %gnu_indirect_function
.global __GI_foo
.hidden __GI_foo
.set __GI_foo, foo
.text
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.globl bar
.type bar, @function
bar:
call __GI_foo@PLT
ret
.size bar, .-bar

8
ld/testsuite/ld-ifunc/ifunc-2-i386.d Normal file
View File

@ -0,0 +1,8 @@
#ld: -m elf_i386 -shared
#as: --32
#objdump: -dw
#target: x86_64-*-* i?86-*-*
#...
[ \t0-9a-f]+:[ \t0-9a-f]+call[ \t0-9a-f]+<\*ABS\*@plt>
#pass

21
ld/testsuite/ld-ifunc/ifunc-2-i386.s Normal file
View File

@ -0,0 +1,21 @@
.type foo, %gnu_indirect_function
.global __GI_foo
.hidden __GI_foo
.set __GI_foo, foo
.text
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.globl bar
.type bar, @function
bar:
call .L6
.L6:
popl %ebx
addl $_GLOBAL_OFFSET_TABLE_+[.-.L6], %ebx
call __GI_foo
leal __GI_foo@GOTOFF(%ebx), %eax
ret
.size bar, .-bar

8
ld/testsuite/ld-ifunc/ifunc-2-x86-64.d Normal file
View File

@ -0,0 +1,8 @@
#ld: -shared
#objdump: -dw
#target: x86_64-*-*
#...
[ \t0-9a-f]+:[ \t0-9a-f]+call[ \t0-9a-fq]+<\*ABS\*@plt>
[ \t0-9a-f]+:[ \t0-9a-f]+lea[ \t]+.*\(%rip\),%rax.*[ \t0-9a-fq]+<\*ABS\*@plt>
#pass

17
ld/testsuite/ld-ifunc/ifunc-2-x86-64.s Normal file
View File

@ -0,0 +1,17 @@
.type foo, %gnu_indirect_function
.global __GI_foo
.hidden __GI_foo
.set __GI_foo, foo
.text
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.globl bar
.type bar, @function
bar:
call __GI_foo
leaq __GI_foo(%rip), %rax
ret
.size bar, .-bar

16
ld/testsuite/ld-ifunc/ifunc-3-x86.s Normal file
View File

@ -0,0 +1,16 @@
.type foo, %gnu_indirect_function
.global __GI_foo
.protected __GI_foo
.set __GI_foo, foo
.text
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.globl bar
.type bar, @function
bar:
call __GI_foo@PLT
ret
.size bar, .-bar

8
ld/testsuite/ld-ifunc/ifunc-3a-x86.d Normal file
View File

@ -0,0 +1,8 @@
#source: ifunc-3-x86.s
#ld: -shared
#objdump: -dw
#target: x86_64-*-* i?86-*-*
#...
[ \t0-9a-f]+:[ \t0-9a-f]+call[ \t0-9a-fq]+<\*ABS\*@plt>
#pass

8
ld/testsuite/ld-ifunc/ifunc-3b-x86.d Normal file
View File

@ -0,0 +1,8 @@
#source: ifunc-3-x86.s
#ld: -shared
#readelf: -r --wide
#target: x86_64-*-* i?86-*-*
#...
[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_[_0-9A-Z]+_IRELATIVE[ ]*[0-9a-f]*
#pass

7
ld/testsuite/ld-ifunc/ifunc-4-x86.d Normal file
View File

@ -0,0 +1,7 @@
#ld:
#readelf: -r --wide
#target: x86_64-*-* i?86-*-*
#...
[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_[_0-9A-Z]+_IRELATIVE[ ]*[0-9a-f]*
#pass

19
ld/testsuite/ld-ifunc/ifunc-4-x86.s Normal file
View File

@ -0,0 +1,19 @@
.text
.type foo, %gnu_indirect_function
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.type start,"function"
.global start
start:
.type _start,"function"
.global _start
_start:
.type __start,"function"
.global __start
__start:
.type __start,"function"
call foo
movl $foo,%eax

8
ld/testsuite/ld-ifunc/ifunc-5-i386.d Normal file
View File

@ -0,0 +1,8 @@
#ld: -m elf_i386
#as: --32
#readelf: -r --wide
#target: x86_64-*-* i?86-*-*
#...
[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_386_IRELATIVE[ ]*
#pass

23
ld/testsuite/ld-ifunc/ifunc-5-i386.s Normal file
View File

@ -0,0 +1,23 @@
.text
.type foo, %gnu_indirect_function
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.type start,"function"
.global start
start:
.type _start,"function"
.global _start
_start:
.type __start,"function"
.global __start
__start:
.type __start,"function"
call .L6
.L6:
popl %ebx
addl $_GLOBAL_OFFSET_TABLE_+[.-.L6], %ebx
call foo@PLT
leal foo@GOT(%ebx), %eax

7
ld/testsuite/ld-ifunc/ifunc-5-x86-64.d Normal file
View File

@ -0,0 +1,7 @@
#ld:
#readelf: -r --wide
#target: x86_64-*-*
#...
[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_X86_64_IRELATIVE[ ]+[0-9a-f]*
#pass

19
ld/testsuite/ld-ifunc/ifunc-5-x86-64.s Normal file
View File

@ -0,0 +1,19 @@
.text
.type foo, %gnu_indirect_function
.globl foo
.type foo, @function
foo:
ret
.size foo, .-foo
.type start,"function"
.global start
start:
.type _start,"function"
.global _start
_start:
.type __start,"function"
.global __start
__start:
.type __start,"function"
call foo@PLT
movq foo@GOTPCREL(%rip), %rax

69
ld/testsuite/ld-ifunc/ifunc.exp
View File

@ -98,6 +98,33 @@ proc contains_ifunc_symbol { binary_file } {
return 1
}
# A procedure to confirm that a file contains the R_*_IRELATIVE
# relocation.
# Returns -1 upon error, 0 if the relocation was not found and 1 if
# it was found.
proc contains_irelative_reloc { binary_file } {
global READELF
global READELFFLAGS
catch "exec $READELF $READELFFLAGS --relocs --wide $binary_file > readelf.out" got
if ![string match "" $got] then {
verbose "proc contains_irelative_reloc: Readelf produced unexpected out processing $binary_file: $got"
return -1
}
# Look for a line like this:
# 0000000000600ab0 0000000000000025 R_X86_64_IRELATIVE 000000000040061c
# 080496f4 0000002a R_386_IRELATIVE
if { ![regexp "\[0-9a-f\]+\[ \]+\[0-9a-f\]+\[ \]+R_\[_0-9A-Z\]+_IRELATIVE\[ \]*\[0-9a-f\]*\n" [file_contents readelf.out]] } {
return 0
}
return 1
}
# A procedure to confirm that a file contains a relocation that references an IFUNC symbol.
# Returns -1 upon error, 0 if the reloc was not found and 1 if it was found.
proc contains_ifunc_reloc { binary_file } {
@ -184,11 +211,16 @@ if { $fails == 0 } {
return
}
# Check the executables.
# Check the executables and shared libraries
#
# The linked ifunc using executables should have an OSABI field of LINUX
# The linked non-ifunc using executable should have an OSABI field of NONE (aka System V).
# The linked ifunc using executables and the shared library containing
# ifunc should have an OSABI field of LINUX. The linked non-ifunc using
# executable should have an OSABI field of NONE (aka System V).
if {! [check_osabi tmpdir/libshared_ifunc.so {UNIX - Linux}]} {
fail "Shared libraries containing ifunc does not have an OS/ABI field of LINUX"
set fails [expr $fails + 1]
}
if {! [check_osabi tmpdir/static_prog {UNIX - Linux}]} {
fail "Static ifunc-using executable does not have an OS/ABI field of LINUX"
set fails [expr $fails + 1]
@ -202,9 +234,14 @@ if {! [check_osabi tmpdir/static_nonifunc_prog {UNIX - System V}]} {
set fails [expr $fails + 1]
}
# The linked ifunc using executables should contain an IFUNC symbol,
# The non-ifunc using executable should not.
# The linked ifunc using executables and the shared library containing
# ifunc should contain an IFUNC symbol. The non-ifunc using executable
# should not.
if {[contains_ifunc_symbol tmpdir/libshared_ifunc.so] != 1} {
fail "Shared libraries containing ifunc does not contain an IFUNC symbol"
set fails [expr $fails + 1]
}
if {[contains_ifunc_symbol tmpdir/static_prog] != 1} {
fail "Static ifunc-using executable does not contain an IFUNC symbol"
set fails [expr $fails + 1]
@ -218,12 +255,17 @@ if {[contains_ifunc_symbol tmpdir/static_nonifunc_prog] != 0} {
set fails [expr $fails + 1]
}
# The linked ifunc using executablea should contain a dynamic reloc referencing the IFUNC symbol.
# (Even the static executable which should have a dynamic section created for it).
# The non-ifunc using executable should not.
# The linked ifunc using executables and shared libraries should contain
# a dynamic reloc referencing the IFUNC symbol. (Even the static
# executable which should have a dynamic section created for it). The
# non-ifunc using executable should not.
if {[contains_ifunc_reloc tmpdir/static_prog] != 1} {
fail "Static ifunc-using executable does not contain a reloc against an IFUNC symbol"
if {[contains_irelative_reloc tmpdir/libshared_ifunc.so] != 1} {
fail "ifunc-using shared library does not contain R_*_IRELATIVE relocation"
set fails [expr $fails + 1]
}
if {[contains_irelative_reloc tmpdir/static_prog] != 1} {
fail "Static ifunc-using executable does not contain R_*_IRELATIVE relocation"
set fails [expr $fails + 1]
}
if {[contains_ifunc_reloc tmpdir/dynamic_prog] != 1} {
@ -252,3 +294,10 @@ if { $verbose < 1 } {
remote_file host delete "tmpdir/static_prog"
remote_file host delete "tmpdir/static_nonifunc_prog"
}
set test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]]
foreach t $test_list {
# We need to strip the ".d", but can leave the dirname.
verbose [file rootname $t]
run_dump_test [file rootname $t]
}

13
ld/testsuite/ld-ifunc/lib.c
View File

@ -15,6 +15,19 @@ void * library_func2_ifunc (void) __asm__ ("library_func2");
void * library_func2_ifunc (void) { return global ? minus_one : zero ; }
__asm__(".type library_func2, %gnu_indirect_function");
extern int library_func2 (int);
extern __typeof (library_func2) library_func2 __asm__ ("__GI_library_func2");
__asm__(".global __GI_library_func2");
__asm__(".hidden __GI_library_func2");
__asm__(".set __GI_library_func2, library_func2");
int
library_func (int x)
{
return library_func2 (x);
}
#else /* WITHOUT_IFUNC */
int