/* x86 specific support for ELF
- Copyright (C) 2017 Free Software Foundation, Inc.
+ Copyright (C) 2017-2018 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
into the shared library. However, if we are linking with -Bsymbolic,
we do not need to copy a reloc against a global symbol which is
defined in an object we are including in the link (i.e., DEF_REGULAR
- is set). At this point we have not seen all the input files, so it
- is possible that DEF_REGULAR is not set now but will be set later (it
- is never cleared). In case of a weak definition, DEF_REGULAR may be
- cleared later by a strong definition in a shared library. We account
- for that possibility below by storing information in the relocs_copied
- field of the hash table entry. A similar situation occurs when
- creating shared libraries and symbol visibility changes render the
- symbol local.
+ is set).
+
+ If PCREL_PLT is true, don't generate dynamic relocation in PIE for
+ PC-relative relocation against a dynamic function definition in data
+ section when PLT address can be used.
If on the other hand, we are creating an executable, we may need to
keep relocations for symbols satisfied by a dynamic library if we
We also need to generate dynamic pointer relocation against
STT_GNU_IFUNC symbol in the non-code section. */
-#define NEED_DYNAMIC_RELOCATION_P(INFO, H, SEC, R_TYPE, POINTER_TYPE) \
+#define NEED_DYNAMIC_RELOCATION_P(INFO, PCREL_PLT, H, SEC, R_TYPE, \
+ POINTER_TYPE) \
((bfd_link_pic (INFO) \
&& (! X86_PCREL_TYPE_P (R_TYPE) \
|| ((H) != NULL \
&& (! (bfd_link_pie (INFO) \
|| SYMBOLIC_BIND ((INFO), (H))) \
|| (H)->root.type == bfd_link_hash_defweak \
- || !(H)->def_regular)))) \
- || ((H) != NULL \
- && (H)->type == STT_GNU_IFUNC \
- && (R_TYPE) == POINTER_TYPE \
- && ((SEC)->flags & SEC_CODE) == 0) \
- || (ELIMINATE_COPY_RELOCS \
- && !bfd_link_pic (INFO) \
- && (H) != NULL \
- && ((H)->root.type == bfd_link_hash_defweak \
- || !(H)->def_regular)))
+ || (!(bfd_link_pie (INFO) \
+ && (PCREL_PLT) \
+ && (H)->plt.refcount > 0 \
+ && ((SEC)->flags & SEC_CODE) == 0 \
+ && (H)->type == STT_FUNC \
+ && (H)->def_dynamic) \
+ && !(H)->def_regular))))) \
+ || ((H) != NULL \
+ && (H)->type == STT_GNU_IFUNC \
+ && (R_TYPE) == POINTER_TYPE \
+ && ((SEC)->flags & SEC_CODE) == 0) \
+ || (ELIMINATE_COPY_RELOCS \
+ && !bfd_link_pic (INFO) \
+ && (H) != NULL \
+ && ((H)->root.type == bfd_link_hash_defweak \
+ || !(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
&& (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) \
is only used by x86-64. */
unsigned int needs_copy : 1;
- /* Reference count of C/C++ function pointer relocations in read-write
- section which can be resolved at run-time. */
- bfd_signed_vma func_pointer_refcount;
-
/* Information about the GOT PLT entry. Filled when there are both
GOT and PLT relocations against the same function. */
union gotplt_union plt_got;
/* The first entry in an absolute lazy procedure linkage table looks
like this. */
const bfd_byte *plt0_entry;
- unsigned int plt0_entry_size; /* Size of PLT0 entry. */
+ unsigned int plt0_entry_size; /* Size of PLT0 entry. */
/* Later entries in an absolute lazy procedure linkage table look
like this. */
const bfd_byte *plt_entry;
- unsigned int plt_entry_size; /* Size of each PLT entry. */
+ unsigned int plt_entry_size; /* Size of each PLT entry. */
/* Offsets into plt0_entry that are to be replaced with GOT[1] and
GOT[2]. */
/* Entries in a PIC non-lazy procedure linkage table look like this. */
const bfd_byte *pic_plt_entry;
- unsigned int plt_entry_size; /* Size of each PLT entry. */
+ unsigned int plt_entry_size; /* Size of each PLT entry. */
/* Offsets into plt_entry that are to be replaced with... */
unsigned int plt_got_offset; /* ... address of this symbol in .got. */
const bfd_byte *plt0_entry;
/* Entries in a procedure linkage table look like this. */
const bfd_byte *plt_entry;
- unsigned int plt_entry_size; /* Size of each PLT entry. */
+ unsigned int plt_entry_size; /* Size of each PLT entry. */
/* 1 has PLT0. */
unsigned int has_plt0;
#define elf_x86_hash_entry(ent) \
((struct elf_x86_link_hash_entry *)(ent))
+enum elf_x86_target_os
+{
+ is_normal,
+ is_solaris,
+ is_vxworks,
+ is_nacl
+};
+
/* x86 ELF linker hash table. */
struct elf_x86_link_hash_table
to read-only sections. */
bfd_boolean readonly_dynrelocs_against_ifunc;
- /* TRUE if this is a VxWorks x86 target. This is only used for
- i386. */
- bfd_boolean is_vxworks;
-
/* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
This is used for i386 only. */
asection *srelplt2;
yet. This is only used for x86-64. */
bfd_vma tlsdesc_plt;
+ /* Value used to fill the unused bytes of the first PLT entry. This
+ is only used for i386. */
+ bfd_byte plt0_pad_byte;
+
+ /* TRUE if GOT is referenced. */
+ unsigned int got_referenced : 1;
+
+ /* TRUE if PLT is PC-relative. PLT in PDE and PC-relative PLT in PIE
+ can be used as function address.
+
+ NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can
+ be used as function address. PIC PLT in PIE can't be used as
+ function address. */
+ unsigned int pcrel_plt : 1;
+
bfd_vma (*r_info) (bfd_vma, bfd_vma);
bfd_vma (*r_sym) (bfd_vma);
bfd_boolean (*is_reloc_section) (const char *);
enum elf_target_id target_id;
+ enum elf_x86_target_os target_os;
unsigned int sizeof_reloc;
unsigned int dt_reloc;
unsigned int dt_reloc_sz;
const char *tls_get_addr;
};
+/* Architecture-specific backend data for x86. */
+
+struct elf_x86_backend_data
+{
+ /* Target system. */
+ enum elf_x86_target_os target_os;
+};
+
+#define get_elf_x86_backend_data(abfd) \
+ ((const struct elf_x86_backend_data *) \
+ get_elf_backend_data (abfd)->arch_data)
+
struct elf_x86_init_table
{
/* The lazy PLT layout. */
/* The non-lazy PLT layout for IBT. */
const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
- /* TRUE if this is a normal x86 target. */
- bfd_boolean normal_target;
-
- /* TRUE if this is a VxWorks x86 target. */
- bfd_boolean is_vxworks;
+ bfd_byte plt0_pad_byte;
bfd_vma (*r_info) (bfd_vma, bfd_vma);
bfd_vma (*r_sym) (bfd_vma);
extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
(bfd *, struct bfd_link_info *);
+extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
+ (bfd *, struct bfd_link_info *);
+
extern bfd_boolean _bfd_x86_elf_always_size_sections
(bfd *, struct bfd_link_info *);
#define elf_backend_gc_mark_hook \
_bfd_x86_elf_gc_mark_hook
#define elf_backend_omit_section_dynsym \
- ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
+ ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) (bfd_boolean (*)) bfd_true)
#define elf_backend_parse_gnu_properties \
_bfd_x86_elf_parse_gnu_properties
#define elf_backend_merge_gnu_properties \
projects / deliverable / binutils-gdb.git / blobdiff