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x86: Add GENERATE_DYNAMIC_RELOCATION_P

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Add GENERATE_DYNAMIC_RELOCATION_P which returns TRUE if dynamic
relocation should be generated.

	* elf32-i386.c (X86_SIZE_TYPE_P): New.
	(elf_i386_relocate_section): Use GENERATE_DYNAMIC_RELOCATION_P.
	* elf64-x86-64.c (X86_SIZE_TYPE_P): New.
	(elf_x86_64_relocate_section): Use GENERATE_DYNAMIC_RELOCATION_P.
	* elfxx-x86.h (GENERATE_DYNAMIC_RELOCATION_P): New.
This commit is contained in:
H.J. Lu
2017-10-06 00:40:56 -07:00
parent cf1070f1a1
commit aebcc8ffd2
4 changed files with 59 additions and 57 deletions
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8
bfd/ChangeLog
View File

@ -1,3 +1,11 @@
2017-10-06 H.J. Lu <hongjiu.lu@intel.com>
* elf32-i386.c (X86_SIZE_TYPE_P): New.
(elf_i386_relocate_section): Use GENERATE_DYNAMIC_RELOCATION_P.
* elf64-x86-64.c (X86_SIZE_TYPE_P): New.
(elf_x86_64_relocate_section): Use GENERATE_DYNAMIC_RELOCATION_P.
* elfxx-x86.h (GENERATE_DYNAMIC_RELOCATION_P): New.
2017-10-06 H.J. Lu <hongjiu.lu@intel.com> 2017-10-06 H.J. Lu <hongjiu.lu@intel.com>
* elfxx-x86.h (POINTER_LOCAL_IFUNC_P): New. * elfxx-x86.h (POINTER_LOCAL_IFUNC_P): New.

28
bfd/elf32-i386.c
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@ -184,6 +184,8 @@ static reloc_howto_type elf_howto_table[]=
#define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32) #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
#define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
#ifdef DEBUG_GEN_RELOC #ifdef DEBUG_GEN_RELOC
#define TRACE(str) \ #define TRACE(str) \
fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
@ -2749,29 +2751,9 @@ disallow_got32:
|| is_vxworks_tls) || is_vxworks_tls)
break; break;
/* Copy dynamic function pointer relocations. Don't generate if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
dynamic relocations against resolved undefined weak symbols FALSE, resolved_to_zero,
in PIE, except for R_386_PC32. */ (r_type == R_386_PC32)))
if ((bfd_link_pic (info)
&& (h == NULL
|| ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
&& (!resolved_to_zero
|| r_type == R_386_PC32))
|| h->root.type != bfd_link_hash_undefweak))
&& ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
|| !SYMBOL_CALLS_LOCAL (info, h)))
|| (ELIMINATE_COPY_RELOCS
&& !bfd_link_pic (info)
&& h != NULL
&& h->dynindx != -1
&& (!h->non_got_ref
|| eh->func_pointer_refcount > 0
|| (h->root.type == bfd_link_hash_undefweak
&& !resolved_to_zero))
&& ((h->def_dynamic && !h->def_regular)
/* Undefined weak symbol is bound locally when
PIC is false. */
|| h->root.type == bfd_link_hash_undefweak)))
{ {
Elf_Internal_Rela outrel; Elf_Internal_Rela outrel;
bfd_boolean skip, relocate; bfd_boolean skip, relocate;

42
bfd/elf64-x86-64.c
View File

@ -206,6 +206,9 @@ static reloc_howto_type x86_64_elf_howto_table[] =
|| ((TYPE) == R_X86_64_PC32_BND) \ || ((TYPE) == R_X86_64_PC32_BND) \
|| ((TYPE) == R_X86_64_PC64)) || ((TYPE) == R_X86_64_PC64))
#define X86_SIZE_TYPE_P(TYPE) \
((TYPE) == R_X86_64_SIZE32 || (TYPE) == R_X86_64_SIZE64)
/* Map BFD relocs to the x86_64 elf relocs. */ /* Map BFD relocs to the x86_64 elf relocs. */
struct elf_reloc_map struct elf_reloc_map
{ {
@ -2393,6 +2396,7 @@ elf_x86_64_relocate_section (bfd *output_bfd,
bfd_boolean resolved_to_zero; bfd_boolean resolved_to_zero;
bfd_boolean relative_reloc; bfd_boolean relative_reloc;
bfd_boolean converted_reloc; bfd_boolean converted_reloc;
bfd_boolean need_copy_reloc_in_pie;
r_type = ELF32_R_TYPE (rel->r_info); r_type = ELF32_R_TYPE (rel->r_info);
if (r_type == (int) R_X86_64_GNU_VTINHERIT if (r_type == (int) R_X86_64_GNU_VTINHERIT
@ -3085,40 +3089,18 @@ direct:
if ((input_section->flags & SEC_ALLOC) == 0) if ((input_section->flags & SEC_ALLOC) == 0)
break; break;
/* Don't copy a pc-relative relocation into the output file need_copy_reloc_in_pie = (bfd_link_pie (info)
if the symbol needs copy reloc or the symbol is undefined
when building executable. Copy dynamic function pointer
relocations. Don't generate dynamic relocations against
resolved undefined weak symbols in PIE. */
if ((bfd_link_pic (info)
&& !(bfd_link_pie (info)
&& h != NULL && h != NULL
&& (h->needs_copy && (h->needs_copy
|| eh->needs_copy || eh->needs_copy
|| h->root.type == bfd_link_hash_undefined) || (h->root.type
== bfd_link_hash_undefined))
&& (X86_PCREL_TYPE_P (r_type) && (X86_PCREL_TYPE_P (r_type)
|| r_type == R_X86_64_SIZE32 || X86_SIZE_TYPE_P (r_type)));
|| r_type == R_X86_64_SIZE64))
&& (h == NULL if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
|| ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT need_copy_reloc_in_pie,
&& !resolved_to_zero) resolved_to_zero, FALSE))
|| h->root.type != bfd_link_hash_undefweak))
&& ((! X86_PCREL_TYPE_P (r_type)
&& r_type != R_X86_64_SIZE32
&& r_type != R_X86_64_SIZE64)
|| ! SYMBOL_CALLS_LOCAL (info, h)))
|| (ELIMINATE_COPY_RELOCS
&& !bfd_link_pic (info)
&& h != NULL
&& h->dynindx != -1
&& (!h->non_got_ref
|| eh->func_pointer_refcount > 0
|| (h->root.type == bfd_link_hash_undefweak
&& !resolved_to_zero))
&& ((h->def_dynamic && !h->def_regular)
/* Undefined weak symbol is bound locally when
PIC is false. */
|| h->root.type == bfd_link_hash_undefined)))
{ {
Elf_Internal_Rela outrel; Elf_Internal_Rela outrel;
bfd_boolean skip, relocate; bfd_boolean skip, relocate;

30
bfd/elfxx-x86.h
View File

@ -113,6 +113,36 @@
&& ((H)->root.type == bfd_link_hash_defweak \ && ((H)->root.type == bfd_link_hash_defweak \
|| !(H)->def_regular))) || !(H)->def_regular)))
/* TRUE if dynamic relocation should be generated. Don't copy a
pc-relative relocation into the output file if the symbol needs
copy reloc or the symbol is undefined when building executable.
Copy dynamic function pointer relocations. Don't generate dynamic
relocations against resolved undefined weak symbols in PIE, except
when PC32_RELOC is TRUE. Undefined weak symbol is bound locally
when PIC is false. */
#define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \
NEED_COPY_RELOC_IN_PIE, \
RESOLVED_TO_ZERO, PC32_RELOC) \
((bfd_link_pic (INFO) \
&& !(NEED_COPY_RELOC_IN_PIE) \
&& ((EH) == NULL \
|| ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \
&& (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \
|| (EH)->elf.root.type != bfd_link_hash_undefweak)) \
&& ((!X86_PCREL_TYPE_P (R_TYPE) \
&& !X86_SIZE_TYPE_P (R_TYPE)) \
|| ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \
|| (ELIMINATE_COPY_RELOCS \
&& !bfd_link_pic (INFO) \
&& (EH) != NULL \
&& (EH)->elf.dynindx != -1 \
&& (!(EH)->elf.non_got_ref \
|| (EH)->func_pointer_refcount > 0 \
|| ((EH)->elf.root.type == bfd_link_hash_undefweak \
&& !(RESOLVED_TO_ZERO))) \
&& (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
|| (EH)->elf.root.type == bfd_link_hash_undefined)))
/* TRUE if this is actually a static link, or it is a -Bsymbolic link /* TRUE if this is actually a static link, or it is a -Bsymbolic link
and the symbol is defined locally, or the symbol was forced to be and the symbol is defined locally, or the symbol was forced to be
local because of a version file. */ local because of a version file. */