#include "bfd_stdint.h"
#include "hashtab.h"
+#define PLT_CIE_LENGTH 20
+#define PLT_FDE_LENGTH 36
+#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
+#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
+
#define ABI_64_P(abfd) \
(get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
#define ELIMINATE_COPY_RELOCS 1
#define elf_x86_hash_table(p, id) \
- (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
+ (is_elf_hash_table ((p)->hash) \
+ && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)
+/* Will references to this symbol always be local in this object? */
+#define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \
+ _bfd_x86_elf_link_symbol_references_local ((INFO), (H))
+
/* Is a undefined weak symbol which is resolved to 0. Reference to an
undefined weak symbol is resolved to 0 when building executable if
it isn't dynamic and
2. Has no GOT/PLT relocation.
Local undefined weak symbol is always resolved to 0.
*/
-#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, ID, GOT_RELOC, EH) \
+#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
((EH)->elf.root.type == bfd_link_hash_undefweak \
- && ((EH)->elf.forced_local \
+ && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \
|| (bfd_link_executable (INFO) \
- && (elf_x86_hash_table ((INFO), (ID))->interp == NULL \
- || !(GOT_RELOC) \
- || (EH)->has_non_got_reloc \
- || !(INFO)->dynamic_undefined_weak))))
+ && (!(EH)->has_got_reloc \
+ || (EH)->has_non_got_reloc))))
/* Should copy relocation be generated for a symbol. Don't generate
copy relocation against a protected symbol defined in a shared
&& ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
&& ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
+/* TRUE if dynamic relocation is needed. If we are creating a shared
+ library, and this is a reloc against a global symbol, or a non PC
+ relative reloc against a local symbol, then we need to copy the reloc
+ 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.
+
+ 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
+ manage to avoid copy relocs for the symbol.
+
+ 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) \
+ ((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)))
+
+/* 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 input relocation should be copied to output. H->dynindx
+ may be -1 if this symbol was marked to become local. */
+#define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
+ ((H) != NULL \
+ && (H)->dynindx != -1 \
+ && (X86_PCREL_TYPE_P (R_TYPE) \
+ || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
+ || !(H)->def_regular))
+
+/* 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
+ local because of a version file. */
+#define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
+ (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
+ bfd_link_pic (INFO), (H)) \
+ || (bfd_link_pic (INFO) \
+ && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
+ || (ELF_ST_VISIBILITY ((H)->other) \
+ && (H)->root.type == bfd_link_hash_undefweak))
+
+/* TRUE if relative relocation should be generated. GOT reference to
+ global symbol in PIC will lead to dynamic symbol. It becomes a
+ problem when "time" or "times" is defined as a variable in an
+ executable, clashing with functions of the same name in libc. If a
+ symbol isn't undefined weak symbol, don't make it dynamic in PIC and
+ generate relative relocation. */
+#define GENERATE_RELATIVE_RELOC_P(INFO, H) \
+ ((H)->dynindx == -1 \
+ && !(H)->forced_local \
+ && (H)->root.type != bfd_link_hash_undefweak \
+ && bfd_link_pic (INFO))
+
+/* TRUE if this is a pointer reference to a local IFUNC. */
+#define POINTER_LOCAL_IFUNC_P(INFO, H) \
+ ((H)->dynindx == -1 \
+ || (H)->forced_local \
+ || bfd_link_executable (INFO))
+
+/* TRUE if this is a PLT reference to a local IFUNC. */
+#define PLT_LOCAL_IFUNC_P(INFO, H) \
+ ((H)->dynindx == -1 \
+ || ((bfd_link_executable (INFO) \
+ || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
+ && (H)->def_regular \
+ && (H)->type == STT_GNU_IFUNC))
+
+/* TRUE if TLS IE->LE transition is OK. */
+#define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
+ (bfd_link_executable (INFO) \
+ && (H) != NULL \
+ && (H)->dynindx == -1 \
+ && (TLS_TYPE & GOT_TLS_IE))
+
+/* Verify that the symbol has an entry in the procedure linkage table. */
+#define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
+ do \
+ { \
+ if (((H)->dynindx == -1 \
+ && !LOCAL_UNDEFWEAK \
+ && !(((H)->forced_local || bfd_link_executable (INFO)) \
+ && (H)->def_regular \
+ && (H)->type == STT_GNU_IFUNC)) \
+ || (PLT) == NULL \
+ || (GOTPLT) == NULL \
+ || (RELPLT) == NULL) \
+ abort (); \
+ } \
+ while (0);
+
+/* Verify that the symbol supports copy relocation. */
+#define VERIFY_COPY_RELOC(H, HTAB) \
+ do \
+ { \
+ if ((H)->dynindx == -1 \
+ || ((H)->root.type != bfd_link_hash_defined \
+ && (H)->root.type != bfd_link_hash_defweak) \
+ || (HTAB)->elf.srelbss == NULL \
+ || (HTAB)->elf.sreldynrelro == NULL) \
+ abort (); \
+ } \
+ while (0);
+
/* x86 ELF linker hash entry. */
struct elf_x86_link_hash_entry
/* TRUE if symbol is defined as a protected symbol. */
unsigned int def_protected : 1;
- /* Symbol is referenced by R_386_GOTOFF relocation. This is only used
- by i386. */
+ /* 0: Symbol references are unknown.
+ 1: Symbol references aren't local.
+ 2: Symbol references are local.
+ */
+ unsigned int local_ref : 2;
+
+ /* TRUE if symbol is defined by linker. */
+ unsigned int linker_def : 1;
+
+ /* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is
+ only used by i386. */
unsigned int gotoff_ref : 1;
/* TRUE if a weak symbol with a real definition needs a copy reloc.
unsigned int eh_frame_plt_size;
};
-/* The first 3 values in tls_type of x86 ELF linker hash entry. */
+/* Values in tls_type of x86 ELF linker hash entry. */
#define GOT_UNKNOWN 0
#define GOT_NORMAL 1
#define GOT_TLS_GD 2
+#define GOT_TLS_IE 4
+#define GOT_TLS_IE_POS 5
+#define GOT_TLS_IE_NEG 6
+#define GOT_TLS_IE_BOTH 7
+#define GOT_TLS_GDESC 8
+#define GOT_TLS_GD_BOTH_P(type) \
+ ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
+#define GOT_TLS_GD_P(type) \
+ ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
+#define GOT_TLS_GDESC_P(type) \
+ ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
+#define GOT_TLS_GD_ANY_P(type) \
+ (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
#define elf_x86_hash_entry(ent) \
((struct elf_x86_link_hash_entry *)(ent))
htab_t loc_hash_table;
void * loc_hash_memory;
- /* The offset into splt of the PLT entry for the TLS descriptor
- resolver. Special values are 0, if not necessary (or not found
- to be necessary yet), and -1 if needed but not determined
- yet. */
- bfd_vma tlsdesc_plt;
-
/* The offset into sgot of the GOT entry used by the PLT entry
above. */
bfd_vma tlsdesc_got;
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;
/* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This
- is used for i386 only. */
+ is only used for i386. */
bfd_vma next_tls_desc_index;
+ /* The offset into splt of the PLT entry for the TLS descriptor
+ resolver. Special values are 0, if not necessary (or not found
+ to be necessary yet), and -1 if needed but not determined
+ yet. This is only used for x86-64. */
+ bfd_vma tlsdesc_plt;
+
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;
+ unsigned int sizeof_reloc;
+ unsigned int dt_reloc;
+ unsigned int dt_reloc_sz;
+ unsigned int dt_reloc_ent;
+ unsigned int got_entry_size;
unsigned int pointer_r_type;
int dynamic_interpreter_size;
const char *dynamic_interpreter;
const char *tls_get_addr;
};
-struct elf_x86_plt_layout_table
+struct elf_x86_init_table
{
/* The lazy PLT layout. */
const struct elf_x86_lazy_plt_layout *lazy_plt;
/* The non-lazy PLT layout for IBT. */
const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
- /* TRUE if this is an normal x86 target. */
+ /* 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_vma (*r_info) (bfd_vma, bfd_vma);
+ bfd_vma (*r_sym) (bfd_vma);
};
struct elf_x86_obj_tdata
#define elf_x86_local_tlsdesc_gotent(abfd) \
(elf_x86_tdata (abfd)->local_tlsdesc_gotent)
+#define elf_x86_compute_jump_table_size(htab) \
+ ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
+
+#define is_x86_elf(bfd, htab) \
+ (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
+ && elf_tdata (bfd) != NULL \
+ && elf_object_id (bfd) == (htab)->target_id)
+
+extern bfd_boolean _bfd_x86_elf_mkobject
+ (bfd *);
+
extern void _bfd_x86_elf_set_tls_module_base
(struct bfd_link_info *);
extern bfd_boolean _bfd_x86_elf_link_check_relocs
(bfd *, struct bfd_link_info *);
+extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
+ (bfd *, struct bfd_link_info *);
+
extern bfd_boolean _bfd_x86_elf_always_size_sections
(bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_x86_elf_hash_symbol
(struct elf_link_hash_entry *);
+extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
+ (struct bfd_link_info *, struct elf_link_hash_entry *);
+
+extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
+ (struct bfd_link_info *, struct elf_link_hash_entry *);
+
+extern asection * _bfd_x86_elf_gc_mark_hook
+ (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
+ struct elf_link_hash_entry *, Elf_Internal_Sym *);
+
extern long _bfd_x86_elf_get_synthetic_symtab
(bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
asymbol **);
(struct bfd_link_info *, bfd *, elf_property *, elf_property *);
extern bfd * _bfd_x86_elf_link_setup_gnu_properties
- (struct bfd_link_info *, struct elf_x86_plt_layout_table *);
+ (struct bfd_link_info *, struct elf_x86_init_table *);
+#define bfd_elf64_mkobject \
+ _bfd_x86_elf_mkobject
+#define bfd_elf32_mkobject \
+ _bfd_x86_elf_mkobject
#define bfd_elf64_bfd_link_hash_table_create \
_bfd_x86_elf_link_hash_table_create
#define bfd_elf32_bfd_link_hash_table_create \
#define bfd_elf32_bfd_link_check_relocs \
_bfd_x86_elf_link_check_relocs
+#define elf_backend_size_dynamic_sections \
+ _bfd_x86_elf_size_dynamic_sections
#define elf_backend_always_size_sections \
_bfd_x86_elf_always_size_sections
#define elf_backend_merge_symbol_attribute \
_bfd_x86_elf_fixup_symbol
#define elf_backend_hash_symbol \
_bfd_x86_elf_hash_symbol
+#define elf_backend_adjust_dynamic_symbol \
+ _bfd_x86_elf_adjust_dynamic_symbol
+#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)
#define elf_backend_parse_gnu_properties \
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