mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
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
|
|
Copyright 1993, 1994 Free Software Foundation, Inc.
|
|
|
|
This file is part of BFD, the Binary File Descriptor library.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/* This structure contains everything that BFD knows about a target.
|
|
It includes things like its byte order, name, what routines to call
|
|
to do various operations, etc. Every BFD points to a target structure
|
|
with its "xvec" member.
|
|
|
|
There are two such structures here: one for big-endian machines and
|
|
one for little-endian machines. */
|
|
|
|
#define bfd_elf32_close_and_cleanup _bfd_generic_close_and_cleanup
|
|
#define bfd_elf32_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
|
|
#ifndef bfd_elf32_get_section_contents
|
|
#define bfd_elf32_get_section_contents _bfd_generic_get_section_contents
|
|
#endif
|
|
|
|
#define bfd_elf32_bfd_get_relocated_section_contents \
|
|
bfd_generic_get_relocated_section_contents
|
|
#define bfd_elf32_bfd_relax_section bfd_generic_relax_section
|
|
#define bfd_elf32_bfd_make_debug_symbol \
|
|
((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
|
|
|
|
#ifndef bfd_elf32_bfd_copy_private_section_data
|
|
#define bfd_elf32_bfd_copy_private_section_data \
|
|
((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_true)
|
|
#endif
|
|
#ifndef bfd_elf32_bfd_copy_private_bfd_data
|
|
#define bfd_elf32_bfd_copy_private_bfd_data \
|
|
((boolean (*) PARAMS ((bfd *, bfd *))) bfd_true)
|
|
#endif
|
|
#ifndef bfd_elf32_bfd_is_local_label
|
|
#define bfd_elf32_bfd_is_local_label bfd_generic_is_local_label
|
|
#endif
|
|
|
|
#ifndef bfd_elf32_get_dynamic_reloc_upper_bound
|
|
#define bfd_elf32_get_dynamic_reloc_upper_bound \
|
|
_bfd_nodynamic_get_dynamic_reloc_upper_bound
|
|
#endif
|
|
#ifndef bfd_elf32_canonicalize_dynamic_reloc
|
|
#define bfd_elf32_canonicalize_dynamic_reloc \
|
|
_bfd_nodynamic_canonicalize_dynamic_reloc
|
|
#endif
|
|
|
|
#ifdef elf_backend_relocate_section
|
|
#ifndef bfd_elf32_bfd_link_hash_table_create
|
|
#define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
|
|
#endif
|
|
#else /* ! defined (elf_backend_relocate_section) */
|
|
/* If no backend relocate_section routine, use the generic linker. */
|
|
#ifndef bfd_elf32_bfd_link_hash_table_create
|
|
#define bfd_elf32_bfd_link_hash_table_create \
|
|
_bfd_generic_link_hash_table_create
|
|
#endif
|
|
#ifndef bfd_elf32_bfd_link_add_symbols
|
|
#define bfd_elf32_bfd_link_add_symbols _bfd_generic_link_add_symbols
|
|
#endif
|
|
#ifndef bfd_elf32_bfd_final_link
|
|
#define bfd_elf32_bfd_final_link _bfd_generic_final_link
|
|
#endif
|
|
#endif /* ! defined (elf_backend_relocate_section) */
|
|
|
|
#ifndef elf_info_to_howto_rel
|
|
#define elf_info_to_howto_rel 0
|
|
#endif
|
|
|
|
#ifndef ELF_MAXPAGESIZE
|
|
#define ELF_MAXPAGESIZE 1
|
|
#endif
|
|
|
|
#ifndef elf_backend_collect
|
|
#define elf_backend_collect false
|
|
#endif
|
|
|
|
#ifndef elf_backend_sym_is_global
|
|
#define elf_backend_sym_is_global 0
|
|
#endif
|
|
#ifndef elf_backend_object_p
|
|
#define elf_backend_object_p 0
|
|
#endif
|
|
#ifndef elf_backend_symbol_processing
|
|
#define elf_backend_symbol_processing 0
|
|
#endif
|
|
#ifndef elf_backend_symbol_table_processing
|
|
#define elf_backend_symbol_table_processing 0
|
|
#endif
|
|
#ifndef elf_backend_section_processing
|
|
#define elf_backend_section_processing 0
|
|
#endif
|
|
#ifndef elf_backend_section_from_shdr
|
|
#define elf_backend_section_from_shdr 0
|
|
#endif
|
|
#ifndef elf_backend_fake_sections
|
|
#define elf_backend_fake_sections 0
|
|
#endif
|
|
#ifndef elf_backend_section_from_bfd_section
|
|
#define elf_backend_section_from_bfd_section 0
|
|
#endif
|
|
#ifndef elf_backend_add_symbol_hook
|
|
#define elf_backend_add_symbol_hook 0
|
|
#endif
|
|
#ifndef elf_backend_link_output_symbol_hook
|
|
#define elf_backend_link_output_symbol_hook 0
|
|
#endif
|
|
#ifndef elf_backend_create_dynamic_sections
|
|
#define elf_backend_create_dynamic_sections 0
|
|
#endif
|
|
#ifndef elf_backend_check_relocs
|
|
#define elf_backend_check_relocs 0
|
|
#endif
|
|
#ifndef elf_backend_adjust_dynamic_symbol
|
|
#define elf_backend_adjust_dynamic_symbol 0
|
|
#endif
|
|
#ifndef elf_backend_size_dynamic_sections
|
|
#define elf_backend_size_dynamic_sections 0
|
|
#endif
|
|
#ifndef elf_backend_relocate_section
|
|
#define elf_backend_relocate_section 0
|
|
#endif
|
|
#ifndef elf_backend_finish_dynamic_symbol
|
|
#define elf_backend_finish_dynamic_symbol 0
|
|
#endif
|
|
#ifndef elf_backend_finish_dynamic_sections
|
|
#define elf_backend_finish_dynamic_sections 0
|
|
#endif
|
|
#ifndef elf_backend_begin_write_processing
|
|
#define elf_backend_begin_write_processing 0
|
|
#endif
|
|
#ifndef elf_backend_final_write_processing
|
|
#define elf_backend_final_write_processing 0
|
|
#endif
|
|
#ifndef elf_backend_ecoff_debug_swap
|
|
#define elf_backend_ecoff_debug_swap 0
|
|
#endif
|
|
|
|
static CONST struct elf_backend_data elf32_bed =
|
|
{
|
|
#ifdef USE_REL
|
|
0, /* use_rela_p */
|
|
#else
|
|
1, /* use_rela_p */
|
|
#endif
|
|
0, /* elf_64_p */
|
|
ELF_ARCH, /* arch */
|
|
ELF_MACHINE_CODE, /* elf_machine_code */
|
|
ELF_MAXPAGESIZE, /* maxpagesize */
|
|
elf_backend_collect,
|
|
elf_info_to_howto,
|
|
elf_info_to_howto_rel,
|
|
elf_backend_sym_is_global,
|
|
elf_backend_object_p,
|
|
elf_backend_symbol_processing,
|
|
elf_backend_symbol_table_processing,
|
|
elf_backend_section_processing,
|
|
elf_backend_section_from_shdr,
|
|
elf_backend_fake_sections,
|
|
elf_backend_section_from_bfd_section,
|
|
elf_backend_add_symbol_hook,
|
|
elf_backend_link_output_symbol_hook,
|
|
elf_backend_create_dynamic_sections,
|
|
elf_backend_check_relocs,
|
|
elf_backend_adjust_dynamic_symbol,
|
|
elf_backend_size_dynamic_sections,
|
|
elf_backend_relocate_section,
|
|
elf_backend_finish_dynamic_symbol,
|
|
elf_backend_finish_dynamic_sections,
|
|
elf_backend_begin_write_processing,
|
|
elf_backend_final_write_processing,
|
|
elf_backend_ecoff_debug_swap
|
|
};
|
|
|
|
#ifdef TARGET_BIG_SYM
|
|
const bfd_target TARGET_BIG_SYM =
|
|
{
|
|
/* name: identify kind of target */
|
|
TARGET_BIG_NAME,
|
|
|
|
/* flavour: general indication about file */
|
|
bfd_target_elf_flavour,
|
|
|
|
/* byteorder_big_p: data is big endian */
|
|
true,
|
|
|
|
/* header_byteorder_big_p: header is also big endian */
|
|
true,
|
|
|
|
/* object_flags: mask of all file flags */
|
|
(HAS_RELOC | EXEC_P | HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS |
|
|
DYNAMIC | WP_TEXT | D_PAGED),
|
|
|
|
/* section_flags: mask of all section flags */
|
|
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_READONLY |
|
|
SEC_CODE | SEC_DATA | SEC_DEBUGGING),
|
|
|
|
/* leading_symbol_char: is the first char of a user symbol
|
|
predictable, and if so what is it */
|
|
0,
|
|
|
|
/* ar_pad_char: pad character for filenames within an archive header
|
|
FIXME: this really has nothing to do with ELF, this is a characteristic
|
|
of the archiver and/or os and should be independently tunable */
|
|
'/',
|
|
|
|
/* ar_max_namelen: maximum number of characters in an archive header
|
|
FIXME: this really has nothing to do with ELF, this is a characteristic
|
|
of the archiver and should be independently tunable. This value is
|
|
a WAG (wild a** guess) */
|
|
14,
|
|
|
|
/* align_power_min: minimum alignment restriction for any section
|
|
FIXME: this value may be target machine dependent */
|
|
3,
|
|
|
|
/* Routines to byte-swap various sized integers from the data sections */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
|
|
|
|
/* Routines to byte-swap various sized integers from the file headers */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
|
|
|
|
/* bfd_check_format: check the format of a file being read */
|
|
{ _bfd_dummy_target, /* unknown format */
|
|
bfd_elf32_object_p, /* assembler/linker output (object file) */
|
|
bfd_generic_archive_p, /* an archive */
|
|
bfd_elf32_core_file_p /* a core file */
|
|
},
|
|
|
|
/* bfd_set_format: set the format of a file being written */
|
|
{ bfd_false,
|
|
bfd_elf_mkobject,
|
|
_bfd_generic_mkarchive,
|
|
bfd_false
|
|
},
|
|
|
|
/* bfd_write_contents: write cached information into a file being written */
|
|
{ bfd_false,
|
|
bfd_elf32_write_object_contents,
|
|
_bfd_write_archive_contents,
|
|
bfd_false
|
|
},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (bfd_elf32),
|
|
BFD_JUMP_TABLE_COPY (bfd_elf32),
|
|
BFD_JUMP_TABLE_CORE (bfd_elf32),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
|
|
BFD_JUMP_TABLE_SYMBOLS (bfd_elf32),
|
|
BFD_JUMP_TABLE_RELOCS (bfd_elf32),
|
|
BFD_JUMP_TABLE_WRITE (bfd_elf32),
|
|
BFD_JUMP_TABLE_LINK (bfd_elf32),
|
|
BFD_JUMP_TABLE_DYNAMIC (bfd_elf32),
|
|
|
|
/* backend_data: */
|
|
(PTR) &elf32_bed,
|
|
};
|
|
#endif
|
|
|
|
#ifdef TARGET_LITTLE_SYM
|
|
const bfd_target TARGET_LITTLE_SYM =
|
|
{
|
|
/* name: identify kind of target */
|
|
TARGET_LITTLE_NAME,
|
|
|
|
/* flavour: general indication about file */
|
|
bfd_target_elf_flavour,
|
|
|
|
/* byteorder_big_p: data is big endian */
|
|
false, /* Nope -- this one's little endian */
|
|
|
|
/* header_byteorder_big_p: header is also big endian */
|
|
false, /* Nope -- this one's little endian */
|
|
|
|
/* object_flags: mask of all file flags */
|
|
(HAS_RELOC | EXEC_P | HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS |
|
|
DYNAMIC | WP_TEXT | D_PAGED),
|
|
|
|
/* section_flags: mask of all section flags */
|
|
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_READONLY |
|
|
SEC_CODE | SEC_DATA | SEC_DEBUGGING),
|
|
|
|
/* leading_symbol_char: is the first char of a user symbol
|
|
predictable, and if so what is it */
|
|
0,
|
|
|
|
/* ar_pad_char: pad character for filenames within an archive header
|
|
FIXME: this really has nothing to do with ELF, this is a characteristic
|
|
of the archiver and/or os and should be independently tunable */
|
|
'/',
|
|
|
|
/* ar_max_namelen: maximum number of characters in an archive header
|
|
FIXME: this really has nothing to do with ELF, this is a characteristic
|
|
of the archiver and should be independently tunable. This value is
|
|
a WAG (wild a** guess) */
|
|
14,
|
|
|
|
/* align_power_min: minimum alignment restriction for any section
|
|
FIXME: this value may be target machine dependent */
|
|
3,
|
|
|
|
/* Routines to byte-swap various sized integers from the data sections */
|
|
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
|
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
|
bfd_getl16, bfd_getl_signed_16, bfd_putl16,
|
|
|
|
/* Routines to byte-swap various sized integers from the file headers */
|
|
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
|
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
|
bfd_getl16, bfd_getl_signed_16, bfd_putl16,
|
|
|
|
/* bfd_check_format: check the format of a file being read */
|
|
{ _bfd_dummy_target, /* unknown format */
|
|
bfd_elf32_object_p, /* assembler/linker output (object file) */
|
|
bfd_generic_archive_p, /* an archive */
|
|
bfd_elf32_core_file_p /* a core file */
|
|
},
|
|
|
|
/* bfd_set_format: set the format of a file being written */
|
|
{ bfd_false,
|
|
bfd_elf_mkobject,
|
|
_bfd_generic_mkarchive,
|
|
bfd_false
|
|
},
|
|
|
|
/* bfd_write_contents: write cached information into a file being written */
|
|
{ bfd_false,
|
|
bfd_elf32_write_object_contents,
|
|
_bfd_write_archive_contents,
|
|
bfd_false
|
|
},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (bfd_elf32),
|
|
BFD_JUMP_TABLE_COPY (bfd_elf32),
|
|
BFD_JUMP_TABLE_CORE (bfd_elf32),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
|
|
BFD_JUMP_TABLE_SYMBOLS (bfd_elf32),
|
|
BFD_JUMP_TABLE_RELOCS (bfd_elf32),
|
|
BFD_JUMP_TABLE_WRITE (bfd_elf32),
|
|
BFD_JUMP_TABLE_LINK (bfd_elf32),
|
|
BFD_JUMP_TABLE_DYNAMIC (bfd_elf32),
|
|
|
|
/* backend_data: */
|
|
(PTR) &elf32_bed,
|
|
};
|
|
#endif
|