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374d2ef905
ELF. Based on patches by Eric Youngdale <ericy@cais.cais.com>.
* libelf.h (struct elf_link_hash_entry): Remove copy_offset field.
Add got_offset and plt_offset fields.
(ELF_LINK_HASH_REF_DYNAMIC_MULTIPLE): Don't define.
(ELF_LINK_HASH_DEF_DYNAMIC_MULTIPLE): Don't define.
(ELF_LINK_HASH_NEEDS_COPY): Define.
(struct elf_backend_data): Add check_relocs field.
(struct bfd_elf_section_data): Change relocs from PTR to
Elf_Internal_Rela *.
(struct elf_obj_tdata): Add local_got_offsets field.
(elf_local_got_offsets): Define accessor macro.
(bfd_elf32_link_create_dynamic_sections): Declare.
(bfd_elf32_link_record_dynamic_symbol): Declare.
(bfd_elf64_link_create_dynamic_sections): Declare.
(bfd_elf64_link_record_dynamic_symbol): Declare.
* elfcode.h (elf_slurp_reloc_table): Don't use the section data
relocs field.
(elf_link_record_dynamic_symbol): Make globally visible. Use
macro to rename to NAME(bfd_elf,link_record_dynamic_symbol).
(elf_link_add_object_symbols): If creating a shared library, put
make all local symbols dynamic. Don't bother with the
DYNAMIC_MULTIPLE flags. Call the check_relocs backend function if
it is defined.
(elf_link_create_dynamic_sections): Make globally visible. Use
macro to rename to NAME(bfd_elf,link_create_dynamic_sections). If
creating a shared library, make sure that _DYNAMIC is added as a
dynamic symbol.
(elf_link_read_relocs): New function.
(NAME(bfd_elf,record_link_assignment)): If creating a shared
library, always create symbols, and always make them dynamic.
(elf_bfd_final_link): Permit creation of shared libraries.
(elf_link_input_bfd): Use elf_link_read_relocs to get the relocs.
* elf.c (_bfd_elf_link_hash_newfunc): Don't initialize
copy_offset. Initialize got_offset and plt_offset.
* elf32-target.h (elf_backend_check_relocs): Define as 0 if not
defined.
(elf32_bed): Initialize check_relocs field.
* elf64-target.h (elf_backend_check_relocs): Define as 0 if not
defined.
(elf64_bed): Initialize check_relocs field.
* elf32-i386.c (elf_howto_table): Change R_386_PLT32 and
R_386_GOTPC to be pc_relative and pcrel_offset.
(elf_i386_pic_plt0_entry): Define.
(elf_i386_pic_plt_entry): Define.
(elf_i386_create_dynamic_sections): Create a .got.plt section, and
define _GLOBAL_OFFSET_TABLE_ at the start of it. If creating a
shared library, make sure that _GLOBAL_OFFSET_TABLE_ is added as a
dynamic symbol. Don't create .rel.bss if creating a shared
library.
(elf_i386_check_relocs): New function.
(elf_i386_adjust_dynamic_symbol): Don't make a PLT entry if the
symbol already has one. When making a PLT entry, set plt_offset.
Don't create a copy reloc when creating a shared library. Don't
set copy_offset, just set ELF_LINK_HASH_NEEDS_COPY.
(elf_i386_allocate_dynamic_section): Remove.
(elf_i386_size_dynamic_sections): Look through all the sections
rather than assuming we know their names. Remove any empty reloc
or plt sections. Only add a DT_DEBUG entry if not creating a
shared library. Only add a DT_PLTGOT entry if there is a PLT.
Add a DT_TEXTREL entry if required.
(elf_i386_relocate_section): Permit undefined symbols when
creating a shared library. Handle the special relocation types
specially.
(elf_i386_finish_dynamic_symbol): Create a PLT entry if plt_offset
is set. If creating a shared library, produce a PIC PLT entry.
Only mark a PLT symbol as undefined if it was not defined by a
regular object file. Create a GOT entry if got_offset is set.
Create a copy reloc if ELF_LINK_HASH_NEEDS_COPY is set.
(elf_i386_finish_dynamic_sections): Change the handling of
DT_RELSZ to simply subtract out the size of .rel.plt. If creating
a shared library, produce PIC PLT code.
(elf_backend_check_relocs): Define.
* elf32-sparc.c (elf_sparc_howto_table): Change R_SPARC_GOT10,
R_SPARC_GOT22, and R_SPARC_PC10 to not warn about reloc overflow.
(elf32_sparc_create_dynamic_sections): If creating a shared
library, make sure that _GLOBAL_OFFSET_TABLE_ is added as a
dynamic symbol, and set the type to STT_OBJECT. Likewise for
_PROCEDURE_LINKAGE_TABLE_. Don't create .rel.bss if creating a
shared library.
(elf32_sparc_check_relocs): New function.
(elf32_sparc_adjust_dynamic_symbol): Don't make a PLT entry if the
symbol already has one. When making a PLT entry, set plt_offset.
Don't create a copy reloc when creating a shared library. Don't
set copy_offset, just set ELF_LINK_HASH_NEEDS_COPY.
(elf32_sparc_allocate_dynamic_section): Remove.
(elf32_sparc_size_dynamic_sections): Look through all the sections
rather than assuming we know their names. Only add a DT_DEBUG
entry if not creating a shared library. Add a DT_TEXTREL entry if
required.
(elf32_sparc_relocate_section): Permit undefined symbols when
creating a shared library. Handle the special relocation types
specially.
(elf32_sparc_finish_dynamic_symbol): Create a PLT entry if plt_offset
is set. Only mark a PLT symbol as undefined if it was not defined
by a regular object file. Create a GOT entry if got_offset is
set. Create a copy reloc if ELF_LINK_HASH_NEEDS_COPY is set.
(elf32_sparc_finish_dynamic_sections): Store dynobj in a local
variable.
(elf_backend_check_relocs): Define.
363 lines
12 KiB
C
363 lines
12 KiB
C
/* Target definitions for 32-bit ELF
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Copyright 1993, 1994 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This structure contains everything that BFD knows about a target.
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It includes things like its byte order, name, what routines to call
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to do various operations, etc. Every BFD points to a target structure
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with its "xvec" member.
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There are two such structures here: one for big-endian machines and
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one for little-endian machines. */
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#define bfd_elf32_close_and_cleanup _bfd_generic_close_and_cleanup
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#define bfd_elf32_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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#ifndef bfd_elf32_get_section_contents
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#define bfd_elf32_get_section_contents _bfd_generic_get_section_contents
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#endif
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#define bfd_elf32_bfd_get_relocated_section_contents \
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bfd_generic_get_relocated_section_contents
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#define bfd_elf32_bfd_relax_section bfd_generic_relax_section
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#define bfd_elf32_bfd_make_debug_symbol \
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((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
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#ifndef bfd_elf32_bfd_copy_private_section_data
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#define bfd_elf32_bfd_copy_private_section_data \
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((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_true)
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#endif
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#ifndef bfd_elf32_bfd_copy_private_bfd_data
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#define bfd_elf32_bfd_copy_private_bfd_data \
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((boolean (*) PARAMS ((bfd *, bfd *))) bfd_true)
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#endif
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#ifndef bfd_elf32_bfd_is_local_label
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#define bfd_elf32_bfd_is_local_label bfd_generic_is_local_label
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#endif
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#ifndef bfd_elf32_get_dynamic_reloc_upper_bound
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#define bfd_elf32_get_dynamic_reloc_upper_bound \
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_bfd_nodynamic_get_dynamic_reloc_upper_bound
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#endif
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#ifndef bfd_elf32_canonicalize_dynamic_reloc
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#define bfd_elf32_canonicalize_dynamic_reloc \
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_bfd_nodynamic_canonicalize_dynamic_reloc
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#endif
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#ifdef elf_backend_relocate_section
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#ifndef bfd_elf32_bfd_link_hash_table_create
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#define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
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#endif
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#else /* ! defined (elf_backend_relocate_section) */
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/* If no backend relocate_section routine, use the generic linker. */
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#ifndef bfd_elf32_bfd_link_hash_table_create
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#define bfd_elf32_bfd_link_hash_table_create \
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_bfd_generic_link_hash_table_create
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#endif
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#ifndef bfd_elf32_bfd_link_add_symbols
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#define bfd_elf32_bfd_link_add_symbols _bfd_generic_link_add_symbols
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#endif
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#ifndef bfd_elf32_bfd_final_link
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#define bfd_elf32_bfd_final_link _bfd_generic_final_link
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#endif
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#endif /* ! defined (elf_backend_relocate_section) */
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#ifndef elf_info_to_howto_rel
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#define elf_info_to_howto_rel 0
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#endif
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#ifndef ELF_MAXPAGESIZE
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#define ELF_MAXPAGESIZE 1
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#endif
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#ifndef elf_backend_collect
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#define elf_backend_collect false
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#endif
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#ifndef elf_backend_sym_is_global
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#define elf_backend_sym_is_global 0
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#endif
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#ifndef elf_backend_object_p
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#define elf_backend_object_p 0
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#endif
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#ifndef elf_backend_symbol_processing
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#define elf_backend_symbol_processing 0
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#endif
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#ifndef elf_backend_symbol_table_processing
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#define elf_backend_symbol_table_processing 0
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#endif
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#ifndef elf_backend_section_processing
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#define elf_backend_section_processing 0
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#endif
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#ifndef elf_backend_section_from_shdr
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#define elf_backend_section_from_shdr 0
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#endif
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#ifndef elf_backend_fake_sections
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#define elf_backend_fake_sections 0
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#endif
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#ifndef elf_backend_section_from_bfd_section
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#define elf_backend_section_from_bfd_section 0
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#endif
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#ifndef elf_backend_add_symbol_hook
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#define elf_backend_add_symbol_hook 0
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#endif
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#ifndef elf_backend_link_output_symbol_hook
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#define elf_backend_link_output_symbol_hook 0
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#endif
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#ifndef elf_backend_create_dynamic_sections
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#define elf_backend_create_dynamic_sections 0
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#endif
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#ifndef elf_backend_check_relocs
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#define elf_backend_check_relocs 0
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#endif
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#ifndef elf_backend_adjust_dynamic_symbol
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#define elf_backend_adjust_dynamic_symbol 0
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#endif
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#ifndef elf_backend_size_dynamic_sections
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#define elf_backend_size_dynamic_sections 0
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#endif
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#ifndef elf_backend_relocate_section
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#define elf_backend_relocate_section 0
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#endif
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#ifndef elf_backend_finish_dynamic_symbol
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#define elf_backend_finish_dynamic_symbol 0
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#endif
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#ifndef elf_backend_finish_dynamic_sections
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#define elf_backend_finish_dynamic_sections 0
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#endif
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#ifndef elf_backend_begin_write_processing
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#define elf_backend_begin_write_processing 0
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#endif
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#ifndef elf_backend_final_write_processing
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#define elf_backend_final_write_processing 0
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#endif
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#ifndef elf_backend_ecoff_debug_swap
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#define elf_backend_ecoff_debug_swap 0
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#endif
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static CONST struct elf_backend_data elf32_bed =
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{
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#ifdef USE_REL
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0, /* use_rela_p */
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#else
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1, /* use_rela_p */
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#endif
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0, /* elf_64_p */
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ELF_ARCH, /* arch */
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ELF_MACHINE_CODE, /* elf_machine_code */
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ELF_MAXPAGESIZE, /* maxpagesize */
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elf_backend_collect,
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elf_info_to_howto,
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elf_info_to_howto_rel,
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elf_backend_sym_is_global,
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elf_backend_object_p,
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elf_backend_symbol_processing,
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elf_backend_symbol_table_processing,
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elf_backend_section_processing,
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elf_backend_section_from_shdr,
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elf_backend_fake_sections,
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elf_backend_section_from_bfd_section,
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elf_backend_add_symbol_hook,
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elf_backend_link_output_symbol_hook,
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elf_backend_create_dynamic_sections,
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elf_backend_check_relocs,
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elf_backend_adjust_dynamic_symbol,
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elf_backend_size_dynamic_sections,
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elf_backend_relocate_section,
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elf_backend_finish_dynamic_symbol,
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elf_backend_finish_dynamic_sections,
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elf_backend_begin_write_processing,
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elf_backend_final_write_processing,
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elf_backend_ecoff_debug_swap
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};
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#ifdef TARGET_BIG_SYM
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const bfd_target TARGET_BIG_SYM =
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{
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/* name: identify kind of target */
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TARGET_BIG_NAME,
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/* flavour: general indication about file */
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bfd_target_elf_flavour,
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/* byteorder_big_p: data is big endian */
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true,
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/* header_byteorder_big_p: header is also big endian */
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true,
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/* object_flags: mask of all file flags */
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(HAS_RELOC | EXEC_P | HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS |
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DYNAMIC | WP_TEXT | D_PAGED),
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/* section_flags: mask of all section flags */
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_READONLY |
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SEC_CODE | SEC_DATA | SEC_DEBUGGING),
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/* leading_symbol_char: is the first char of a user symbol
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predictable, and if so what is it */
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0,
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/* ar_pad_char: pad character for filenames within an archive header
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FIXME: this really has nothing to do with ELF, this is a characteristic
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of the archiver and/or os and should be independently tunable */
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'/',
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/* ar_max_namelen: maximum number of characters in an archive header
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FIXME: this really has nothing to do with ELF, this is a characteristic
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of the archiver and should be independently tunable. This value is
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a WAG (wild a** guess) */
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14,
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/* align_power_min: minimum alignment restriction for any section
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FIXME: this value may be target machine dependent */
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3,
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/* Routines to byte-swap various sized integers from the data sections */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16,
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/* Routines to byte-swap various sized integers from the file headers */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16,
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/* bfd_check_format: check the format of a file being read */
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{ _bfd_dummy_target, /* unknown format */
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bfd_elf32_object_p, /* assembler/linker output (object file) */
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bfd_generic_archive_p, /* an archive */
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bfd_elf32_core_file_p /* a core file */
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},
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/* bfd_set_format: set the format of a file being written */
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{ bfd_false,
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bfd_elf_mkobject,
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_bfd_generic_mkarchive,
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bfd_false
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},
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/* bfd_write_contents: write cached information into a file being written */
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{ bfd_false,
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bfd_elf32_write_object_contents,
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_bfd_write_archive_contents,
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bfd_false
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},
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BFD_JUMP_TABLE_GENERIC (bfd_elf32),
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BFD_JUMP_TABLE_COPY (bfd_elf32),
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BFD_JUMP_TABLE_CORE (bfd_elf32),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
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BFD_JUMP_TABLE_SYMBOLS (bfd_elf32),
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BFD_JUMP_TABLE_RELOCS (bfd_elf32),
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BFD_JUMP_TABLE_WRITE (bfd_elf32),
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BFD_JUMP_TABLE_LINK (bfd_elf32),
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BFD_JUMP_TABLE_DYNAMIC (bfd_elf32),
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/* backend_data: */
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(PTR) &elf32_bed,
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};
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#endif
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#ifdef TARGET_LITTLE_SYM
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const bfd_target TARGET_LITTLE_SYM =
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{
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/* name: identify kind of target */
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TARGET_LITTLE_NAME,
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/* flavour: general indication about file */
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bfd_target_elf_flavour,
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/* byteorder_big_p: data is big endian */
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false, /* Nope -- this one's little endian */
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/* header_byteorder_big_p: header is also big endian */
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false, /* Nope -- this one's little endian */
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/* object_flags: mask of all file flags */
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(HAS_RELOC | EXEC_P | HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS |
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DYNAMIC | WP_TEXT | D_PAGED),
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/* section_flags: mask of all section flags */
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_READONLY |
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SEC_CODE | SEC_DATA | SEC_DEBUGGING),
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/* leading_symbol_char: is the first char of a user symbol
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predictable, and if so what is it */
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0,
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/* ar_pad_char: pad character for filenames within an archive header
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FIXME: this really has nothing to do with ELF, this is a characteristic
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of the archiver and/or os and should be independently tunable */
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'/',
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/* ar_max_namelen: maximum number of characters in an archive header
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FIXME: this really has nothing to do with ELF, this is a characteristic
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of the archiver and should be independently tunable. This value is
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a WAG (wild a** guess) */
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14,
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/* align_power_min: minimum alignment restriction for any section
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FIXME: this value may be target machine dependent */
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3,
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/* Routines to byte-swap various sized integers from the data sections */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16,
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/* Routines to byte-swap various sized integers from the file headers */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16,
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/* bfd_check_format: check the format of a file being read */
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{ _bfd_dummy_target, /* unknown format */
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bfd_elf32_object_p, /* assembler/linker output (object file) */
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bfd_generic_archive_p, /* an archive */
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bfd_elf32_core_file_p /* a core file */
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},
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/* bfd_set_format: set the format of a file being written */
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{ bfd_false,
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bfd_elf_mkobject,
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_bfd_generic_mkarchive,
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bfd_false
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},
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/* bfd_write_contents: write cached information into a file being written */
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{ bfd_false,
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bfd_elf32_write_object_contents,
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_bfd_write_archive_contents,
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bfd_false
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},
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BFD_JUMP_TABLE_GENERIC (bfd_elf32),
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BFD_JUMP_TABLE_COPY (bfd_elf32),
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BFD_JUMP_TABLE_CORE (bfd_elf32),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
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BFD_JUMP_TABLE_SYMBOLS (bfd_elf32),
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BFD_JUMP_TABLE_RELOCS (bfd_elf32),
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BFD_JUMP_TABLE_WRITE (bfd_elf32),
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BFD_JUMP_TABLE_LINK (bfd_elf32),
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BFD_JUMP_TABLE_DYNAMIC (bfd_elf32),
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/* backend_data: */
|
|
(PTR) &elf32_bed,
|
|
};
|
|
#endif
|