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binutils-gdb/bfd/elf64-target.h
Ian Lance Taylor 374d2ef905 Add support for creating shared libraries under i386 ELF and SPARC 
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.
1994-07-26 17:18:37 +00:00

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/* Target definitions for 64-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_elf64_close_and_cleanup _bfd_generic_close_and_cleanup
#define bfd_elf64_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
#ifndef bfd_elf64_get_section_contents
#define bfd_elf64_get_section_contents _bfd_generic_get_section_contents
#endif
#define bfd_elf64_bfd_debug_info_start bfd_void
#define bfd_elf64_bfd_debug_info_end bfd_void
#define bfd_elf64_bfd_debug_info_accumulate (PROTO(void,(*),(bfd*, struct sec *))) bfd_void
#define bfd_elf64_bfd_get_relocated_section_contents \
bfd_generic_get_relocated_section_contents
#define bfd_elf64_bfd_relax_section bfd_generic_relax_section
#define bfd_elf64_bfd_make_debug_symbol \
((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
#ifndef bfd_elf64_bfd_copy_private_section_data
#define bfd_elf64_bfd_copy_private_section_data \
((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_true)
#endif
#ifndef bfd_elf64_bfd_copy_private_bfd_data
#define bfd_elf64_bfd_copy_private_bfd_data \
((boolean (*) PARAMS ((bfd *, bfd *))) bfd_true)
#endif
#ifndef bfd_elf64_bfd_is_local_label
#define bfd_elf64_bfd_is_local_label bfd_generic_is_local_label
#endif
#ifndef bfd_elf64_get_dynamic_reloc_upper_bound
#define bfd_elf64_get_dynamic_reloc_upper_bound \
_bfd_nodynamic_get_dynamic_reloc_upper_bound
#endif
#ifndef bfd_elf64_canonicalize_dynamic_reloc
#define bfd_elf64_canonicalize_dynamic_reloc \
_bfd_nodynamic_canonicalize_dynamic_reloc
#endif
#ifdef elf_backend_relocate_section
#ifndef bfd_elf64_bfd_link_hash_table_create
#define bfd_elf64_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_elf64_bfd_link_hash_table_create
#define bfd_elf64_bfd_link_hash_table_create \
_bfd_generic_link_hash_table_create
#endif
#ifndef bfd_elf64_bfd_link_add_symbols
#define bfd_elf64_bfd_link_add_symbols _bfd_generic_link_add_symbols
#endif
#ifndef bfd_elf64_bfd_final_link
#define bfd_elf64_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 elf64_bed =
{
#ifdef USE_REL
0, /* use_rela_p */
#else
1, /* use_rela_p */
#endif
1, /* 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_elf64_object_p, /* assembler/linker output (object file) */
bfd_generic_archive_p, /* an archive */
bfd_elf64_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_elf64_write_object_contents,
_bfd_write_archive_contents,
bfd_false
},
BFD_JUMP_TABLE_GENERIC (bfd_elf64),
BFD_JUMP_TABLE_COPY (bfd_elf64),
BFD_JUMP_TABLE_CORE (bfd_elf64),
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
BFD_JUMP_TABLE_SYMBOLS (bfd_elf64),
BFD_JUMP_TABLE_RELOCS (bfd_elf64),
BFD_JUMP_TABLE_WRITE (bfd_elf64),
BFD_JUMP_TABLE_LINK (bfd_elf64),
BFD_JUMP_TABLE_DYNAMIC (bfd_elf64),
/* backend_data: */
(PTR) &elf64_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_elf64_object_p, /* assembler/linker output (object file) */
bfd_generic_archive_p, /* an archive */
bfd_elf64_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_elf64_write_object_contents,
_bfd_write_archive_contents,
bfd_false
},
BFD_JUMP_TABLE_GENERIC (bfd_elf64),
BFD_JUMP_TABLE_COPY (bfd_elf64),
BFD_JUMP_TABLE_CORE (bfd_elf64),
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
BFD_JUMP_TABLE_SYMBOLS (bfd_elf64),
BFD_JUMP_TABLE_RELOCS (bfd_elf64),
BFD_JUMP_TABLE_WRITE (bfd_elf64),
BFD_JUMP_TABLE_LINK (bfd_elf64),
BFD_JUMP_TABLE_DYNAMIC (bfd_elf64),
/* backend_data: */
(PTR) &elf64_bed,
};
#endif
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