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1562 lines
48 KiB
C
1562 lines
48 KiB
C
/* ELF executable support for BFD.
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Copyright 1991, 92, 93, 94, 95, 96, 97, 98, 1999, 2000 Free
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Software Foundation, Inc.
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Written by Fred Fish @ Cygnus Support, from information published
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in "UNIX System V Release 4, Programmers Guide: ANSI C and
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Programming Support Tools". Sufficient support for gdb.
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Rewritten by Mark Eichin @ Cygnus Support, from information
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published in "System V Application Binary Interface", chapters 4
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and 5, as well as the various "Processor Supplement" documents
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derived from it. Added support for assembler and other object file
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utilities. Further work done by Ken Raeburn (Cygnus Support), Michael
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Meissner (Open Software Foundation), and Peter Hoogenboom (University
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of Utah) to finish and extend this.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Problems and other issues to resolve.
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(1) BFD expects there to be some fixed number of "sections" in
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the object file. I.E. there is a "section_count" variable in the
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bfd structure which contains the number of sections. However, ELF
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supports multiple "views" of a file. In particular, with current
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implementations, executable files typically have two tables, a
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program header table and a section header table, both of which
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partition the executable.
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In ELF-speak, the "linking view" of the file uses the section header
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table to access "sections" within the file, and the "execution view"
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uses the program header table to access "segments" within the file.
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"Segments" typically may contain all the data from one or more
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"sections".
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Note that the section header table is optional in ELF executables,
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but it is this information that is most useful to gdb. If the
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section header table is missing, then gdb should probably try
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to make do with the program header table. (FIXME)
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(2) The code in this file is compiled twice, once in 32-bit mode and
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once in 64-bit mode. More of it should be made size-independent
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and moved into elf.c.
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(3) ELF section symbols are handled rather sloppily now. This should
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be cleaned up, and ELF section symbols reconciled with BFD section
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symbols.
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(4) We need a published spec for 64-bit ELF. We've got some stuff here
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that we're using for SPARC V9 64-bit chips, but don't assume that
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it's cast in stone.
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*/
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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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/* Renaming structures, typedefs, macros and functions to be size-specific. */
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#define Elf_External_Ehdr NAME(Elf,External_Ehdr)
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#define Elf_External_Sym NAME(Elf,External_Sym)
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#define Elf_External_Shdr NAME(Elf,External_Shdr)
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#define Elf_External_Phdr NAME(Elf,External_Phdr)
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#define Elf_External_Rel NAME(Elf,External_Rel)
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#define Elf_External_Rela NAME(Elf,External_Rela)
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#define Elf_External_Dyn NAME(Elf,External_Dyn)
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#define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command)
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#define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal)
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#define elf_core_file_matches_executable_p \
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NAME(bfd_elf,core_file_matches_executable_p)
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#define elf_object_p NAME(bfd_elf,object_p)
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#define elf_core_file_p NAME(bfd_elf,core_file_p)
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#define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound)
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#define elf_get_dynamic_symtab_upper_bound \
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NAME(bfd_elf,get_dynamic_symtab_upper_bound)
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#define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in)
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#define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in)
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#define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out)
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#define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out)
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#define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in)
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#define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out)
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#define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in)
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#define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out)
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#define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in)
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#define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out)
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#define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound)
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#define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc)
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#define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table)
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#define elf_get_symtab NAME(bfd_elf,get_symtab)
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#define elf_canonicalize_dynamic_symtab \
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NAME(bfd_elf,canonicalize_dynamic_symtab)
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#define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol)
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#define elf_get_symbol_info NAME(bfd_elf,get_symbol_info)
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#define elf_get_lineno NAME(bfd_elf,get_lineno)
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#define elf_set_arch_mach NAME(bfd_elf,set_arch_mach)
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#define elf_find_nearest_line NAME(bfd_elf,find_nearest_line)
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#define elf_sizeof_headers NAME(bfd_elf,sizeof_headers)
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#define elf_set_section_contents NAME(bfd_elf,set_section_contents)
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#define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto)
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#define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel)
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#define elf_find_section NAME(bfd_elf,find_section)
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#define elf_bfd_link_add_symbols NAME(bfd_elf,bfd_link_add_symbols)
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#define elf_add_dynamic_entry NAME(bfd_elf,add_dynamic_entry)
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#define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr)
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#define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs)
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#define elf_write_relocs NAME(bfd_elf,write_relocs)
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#define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table)
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#define elf_link_create_dynamic_sections \
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NAME(bfd_elf,link_create_dynamic_sections)
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#define elf_link_record_dynamic_symbol _bfd_elf_link_record_dynamic_symbol
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#define elf_bfd_final_link NAME(bfd_elf,bfd_final_link)
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#define elf_create_pointer_linker_section NAME(bfd_elf,create_pointer_linker_section)
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#define elf_finish_pointer_linker_section NAME(bfd_elf,finish_pointer_linker_section)
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#define elf_gc_sections NAME(_bfd_elf,gc_sections)
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#define elf_gc_common_finalize_got_offsets \
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NAME(_bfd_elf,gc_common_finalize_got_offsets)
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#define elf_gc_common_final_link NAME(_bfd_elf,gc_common_final_link)
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#define elf_gc_record_vtinherit NAME(_bfd_elf,gc_record_vtinherit)
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#define elf_gc_record_vtentry NAME(_bfd_elf,gc_record_vtentry)
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#define elf_link_record_local_dynamic_symbol \
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NAME(_bfd_elf,link_record_local_dynamic_symbol)
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#if ARCH_SIZE == 64
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#define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y)
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#define ELF_R_SYM(X) ELF64_R_SYM(X)
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#define ELF_R_TYPE(X) ELF64_R_TYPE(X)
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#define ELFCLASS ELFCLASS64
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#define FILE_ALIGN 8
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#define LOG_FILE_ALIGN 3
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#endif
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#if ARCH_SIZE == 32
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#define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y)
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#define ELF_R_SYM(X) ELF32_R_SYM(X)
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#define ELF_R_TYPE(X) ELF32_R_TYPE(X)
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#define ELFCLASS ELFCLASS32
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#define FILE_ALIGN 4
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#define LOG_FILE_ALIGN 2
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#endif
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/* Static functions */
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static void elf_swap_ehdr_in
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PARAMS ((bfd *, const Elf_External_Ehdr *, Elf_Internal_Ehdr *));
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static void elf_swap_ehdr_out
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PARAMS ((bfd *, const Elf_Internal_Ehdr *, Elf_External_Ehdr *));
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static void elf_swap_shdr_in
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PARAMS ((bfd *, const Elf_External_Shdr *, Elf_Internal_Shdr *));
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static void elf_swap_shdr_out
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PARAMS ((bfd *, const Elf_Internal_Shdr *, Elf_External_Shdr *));
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#define elf_stringtab_init _bfd_elf_stringtab_init
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#define section_from_elf_index bfd_section_from_elf_index
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static boolean elf_slurp_reloc_table_from_section
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PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, bfd_size_type,
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arelent *, asymbol **, boolean));
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static boolean elf_file_p PARAMS ((Elf_External_Ehdr *));
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#ifdef DEBUG
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static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *));
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static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *));
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static char *elf_symbol_flags PARAMS ((flagword));
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#endif
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/* Structure swapping routines */
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/* Should perhaps use put_offset, put_word, etc. For now, the two versions
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can be handled by explicitly specifying 32 bits or "the long type". */
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#if ARCH_SIZE == 64
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#define put_word bfd_h_put_64
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#define put_signed_word bfd_h_put_signed_64
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#define get_word bfd_h_get_64
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#define get_signed_word bfd_h_get_signed_64
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#endif
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#if ARCH_SIZE == 32
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#define put_word bfd_h_put_32
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#define put_signed_word bfd_h_put_signed_32
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#define get_word bfd_h_get_32
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#define get_signed_word bfd_h_get_signed_32
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#endif
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/* Translate an ELF symbol in external format into an ELF symbol in internal
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format. */
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void
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elf_swap_symbol_in (abfd, src, dst)
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bfd *abfd;
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const Elf_External_Sym *src;
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Elf_Internal_Sym *dst;
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{
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int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
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dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name);
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if (signed_vma)
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dst->st_value = get_signed_word (abfd, (bfd_byte *) src->st_value);
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else
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dst->st_value = get_word (abfd, (bfd_byte *) src->st_value);
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dst->st_size = get_word (abfd, (bfd_byte *) src->st_size);
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dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info);
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dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other);
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dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx);
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}
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/* Translate an ELF symbol in internal format into an ELF symbol in external
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format. */
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void
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elf_swap_symbol_out (abfd, src, cdst)
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bfd *abfd;
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const Elf_Internal_Sym *src;
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PTR cdst;
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{
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Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
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bfd_h_put_32 (abfd, src->st_name, dst->st_name);
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put_word (abfd, src->st_value, dst->st_value);
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put_word (abfd, src->st_size, dst->st_size);
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bfd_h_put_8 (abfd, src->st_info, dst->st_info);
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bfd_h_put_8 (abfd, src->st_other, dst->st_other);
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bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx);
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}
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/* Translate an ELF file header in external format into an ELF file header in
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internal format. */
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static void
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elf_swap_ehdr_in (abfd, src, dst)
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bfd *abfd;
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const Elf_External_Ehdr *src;
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Elf_Internal_Ehdr *dst;
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{
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int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
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memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
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dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type);
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dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine);
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dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version);
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if (signed_vma)
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dst->e_entry = get_signed_word (abfd, (bfd_byte *) src->e_entry);
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else
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dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry);
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dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff);
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dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff);
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dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags);
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dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize);
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dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize);
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dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum);
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dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize);
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dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum);
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dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx);
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}
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/* Translate an ELF file header in internal format into an ELF file header in
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external format. */
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static void
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elf_swap_ehdr_out (abfd, src, dst)
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bfd *abfd;
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const Elf_Internal_Ehdr *src;
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Elf_External_Ehdr *dst;
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{
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int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
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memcpy (dst->e_ident, src->e_ident, EI_NIDENT);
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/* note that all elements of dst are *arrays of unsigned char* already... */
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bfd_h_put_16 (abfd, src->e_type, dst->e_type);
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bfd_h_put_16 (abfd, src->e_machine, dst->e_machine);
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bfd_h_put_32 (abfd, src->e_version, dst->e_version);
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if (signed_vma)
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put_signed_word (abfd, src->e_entry, dst->e_entry);
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else
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put_word (abfd, src->e_entry, dst->e_entry);
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put_word (abfd, src->e_phoff, dst->e_phoff);
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put_word (abfd, src->e_shoff, dst->e_shoff);
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bfd_h_put_32 (abfd, src->e_flags, dst->e_flags);
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bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize);
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bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize);
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bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum);
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bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize);
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bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum);
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bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx);
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}
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/* Translate an ELF section header table entry in external format into an
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ELF section header table entry in internal format. */
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static void
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elf_swap_shdr_in (abfd, src, dst)
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bfd *abfd;
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const Elf_External_Shdr *src;
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Elf_Internal_Shdr *dst;
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{
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int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
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dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name);
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dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type);
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dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags);
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if (signed_vma)
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dst->sh_addr = get_signed_word (abfd, (bfd_byte *) src->sh_addr);
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else
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dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr);
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dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset);
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dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size);
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dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link);
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dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info);
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dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign);
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dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize);
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dst->bfd_section = NULL;
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dst->contents = NULL;
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}
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/* Translate an ELF section header table entry in internal format into an
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ELF section header table entry in external format. */
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static void
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elf_swap_shdr_out (abfd, src, dst)
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bfd *abfd;
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const Elf_Internal_Shdr *src;
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Elf_External_Shdr *dst;
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{
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/* note that all elements of dst are *arrays of unsigned char* already... */
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bfd_h_put_32 (abfd, src->sh_name, dst->sh_name);
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bfd_h_put_32 (abfd, src->sh_type, dst->sh_type);
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put_word (abfd, src->sh_flags, dst->sh_flags);
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put_word (abfd, src->sh_addr, dst->sh_addr);
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put_word (abfd, src->sh_offset, dst->sh_offset);
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put_word (abfd, src->sh_size, dst->sh_size);
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bfd_h_put_32 (abfd, src->sh_link, dst->sh_link);
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bfd_h_put_32 (abfd, src->sh_info, dst->sh_info);
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put_word (abfd, src->sh_addralign, dst->sh_addralign);
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put_word (abfd, src->sh_entsize, dst->sh_entsize);
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}
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||
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/* Translate an ELF program header table entry in external format into an
|
||
ELF program header table entry in internal format. */
|
||
|
||
void
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elf_swap_phdr_in (abfd, src, dst)
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||
bfd *abfd;
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const Elf_External_Phdr *src;
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Elf_Internal_Phdr *dst;
|
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{
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||
int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
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dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type);
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dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags);
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||
dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset);
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if (signed_vma)
|
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{
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||
dst->p_vaddr = get_signed_word (abfd, (bfd_byte *) src->p_vaddr);
|
||
dst->p_paddr = get_signed_word (abfd, (bfd_byte *) src->p_paddr);
|
||
}
|
||
else
|
||
{
|
||
dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr);
|
||
dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr);
|
||
}
|
||
dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz);
|
||
dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz);
|
||
dst->p_align = get_word (abfd, (bfd_byte *) src->p_align);
|
||
}
|
||
|
||
void
|
||
elf_swap_phdr_out (abfd, src, dst)
|
||
bfd *abfd;
|
||
const Elf_Internal_Phdr *src;
|
||
Elf_External_Phdr *dst;
|
||
{
|
||
/* note that all elements of dst are *arrays of unsigned char* already... */
|
||
bfd_h_put_32 (abfd, src->p_type, dst->p_type);
|
||
put_word (abfd, src->p_offset, dst->p_offset);
|
||
put_word (abfd, src->p_vaddr, dst->p_vaddr);
|
||
put_word (abfd, src->p_paddr, dst->p_paddr);
|
||
put_word (abfd, src->p_filesz, dst->p_filesz);
|
||
put_word (abfd, src->p_memsz, dst->p_memsz);
|
||
bfd_h_put_32 (abfd, src->p_flags, dst->p_flags);
|
||
put_word (abfd, src->p_align, dst->p_align);
|
||
}
|
||
|
||
/* Translate an ELF reloc from external format to internal format. */
|
||
INLINE void
|
||
elf_swap_reloc_in (abfd, src, dst)
|
||
bfd *abfd;
|
||
const Elf_External_Rel *src;
|
||
Elf_Internal_Rel *dst;
|
||
{
|
||
dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
|
||
dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
|
||
}
|
||
|
||
INLINE void
|
||
elf_swap_reloca_in (abfd, src, dst)
|
||
bfd *abfd;
|
||
const Elf_External_Rela *src;
|
||
Elf_Internal_Rela *dst;
|
||
{
|
||
dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset);
|
||
dst->r_info = get_word (abfd, (bfd_byte *) src->r_info);
|
||
dst->r_addend = get_signed_word (abfd, (bfd_byte *) src->r_addend);
|
||
}
|
||
|
||
/* Translate an ELF reloc from internal format to external format. */
|
||
INLINE void
|
||
elf_swap_reloc_out (abfd, src, dst)
|
||
bfd *abfd;
|
||
const Elf_Internal_Rel *src;
|
||
Elf_External_Rel *dst;
|
||
{
|
||
put_word (abfd, src->r_offset, dst->r_offset);
|
||
put_word (abfd, src->r_info, dst->r_info);
|
||
}
|
||
|
||
INLINE void
|
||
elf_swap_reloca_out (abfd, src, dst)
|
||
bfd *abfd;
|
||
const Elf_Internal_Rela *src;
|
||
Elf_External_Rela *dst;
|
||
{
|
||
put_word (abfd, src->r_offset, dst->r_offset);
|
||
put_word (abfd, src->r_info, dst->r_info);
|
||
put_signed_word (abfd, src->r_addend, dst->r_addend);
|
||
}
|
||
|
||
INLINE void
|
||
elf_swap_dyn_in (abfd, p, dst)
|
||
bfd *abfd;
|
||
const PTR p;
|
||
Elf_Internal_Dyn *dst;
|
||
{
|
||
const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
|
||
|
||
dst->d_tag = get_word (abfd, src->d_tag);
|
||
dst->d_un.d_val = get_word (abfd, src->d_un.d_val);
|
||
}
|
||
|
||
INLINE void
|
||
elf_swap_dyn_out (abfd, src, p)
|
||
bfd *abfd;
|
||
const Elf_Internal_Dyn *src;
|
||
PTR p;
|
||
{
|
||
Elf_External_Dyn *dst = (Elf_External_Dyn *) p;
|
||
|
||
put_word (abfd, src->d_tag, dst->d_tag);
|
||
put_word (abfd, src->d_un.d_val, dst->d_un.d_val);
|
||
}
|
||
|
||
/* ELF .o/exec file reading */
|
||
|
||
|
||
/* Begin processing a given object.
|
||
|
||
First we validate the file by reading in the ELF header and checking
|
||
the magic number. */
|
||
|
||
static INLINE boolean
|
||
elf_file_p (x_ehdrp)
|
||
Elf_External_Ehdr *x_ehdrp;
|
||
{
|
||
return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0)
|
||
&& (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1)
|
||
&& (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2)
|
||
&& (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3));
|
||
}
|
||
|
||
/* Check to see if the file associated with ABFD matches the target vector
|
||
that ABFD points to.
|
||
|
||
Note that we may be called several times with the same ABFD, but different
|
||
target vectors, most of which will not match. We have to avoid leaving
|
||
any side effects in ABFD, or any data it points to (like tdata), if the
|
||
file does not match the target vector. */
|
||
|
||
const bfd_target *
|
||
elf_object_p (abfd)
|
||
bfd *abfd;
|
||
{
|
||
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
|
||
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
|
||
Elf_External_Shdr x_shdr; /* Section header table entry, external form */
|
||
Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */
|
||
unsigned int shindex;
|
||
char *shstrtab; /* Internal copy of section header stringtab */
|
||
struct elf_backend_data *ebd;
|
||
struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd);
|
||
struct sec *preserved_sections = abfd->sections;
|
||
unsigned int preserved_section_count = abfd->section_count;
|
||
struct elf_obj_tdata *new_tdata = NULL;
|
||
asection *s;
|
||
|
||
/* Clear section information, since there might be a recognized bfd that
|
||
we now check if we can replace, and we don't want to append to it. */
|
||
abfd->sections = NULL;
|
||
abfd->section_count = 0;
|
||
|
||
/* Read in the ELF header in external format. */
|
||
|
||
if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
|
||
{
|
||
if (bfd_get_error () != bfd_error_system_call)
|
||
goto got_wrong_format_error;
|
||
else
|
||
goto got_no_match;
|
||
}
|
||
|
||
/* Now check to see if we have a valid ELF file, and one that BFD can
|
||
make use of. The magic number must match, the address size ('class')
|
||
and byte-swapping must match our XVEC entry, and it must have a
|
||
section header table (FIXME: See comments re sections at top of this
|
||
file). */
|
||
|
||
if ((elf_file_p (&x_ehdr) == false) ||
|
||
(x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) ||
|
||
(x_ehdr.e_ident[EI_CLASS] != ELFCLASS))
|
||
goto got_wrong_format_error;
|
||
|
||
/* Check that file's byte order matches xvec's */
|
||
switch (x_ehdr.e_ident[EI_DATA])
|
||
{
|
||
case ELFDATA2MSB: /* Big-endian */
|
||
if (! bfd_header_big_endian (abfd))
|
||
goto got_wrong_format_error;
|
||
break;
|
||
case ELFDATA2LSB: /* Little-endian */
|
||
if (! bfd_header_little_endian (abfd))
|
||
goto got_wrong_format_error;
|
||
break;
|
||
case ELFDATANONE: /* No data encoding specified */
|
||
default: /* Unknown data encoding specified */
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
|
||
the tdata pointer in the bfd. */
|
||
|
||
new_tdata = ((struct elf_obj_tdata *)
|
||
bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)));
|
||
if (new_tdata == NULL)
|
||
goto got_no_match;
|
||
elf_tdata (abfd) = new_tdata;
|
||
|
||
/* Now that we know the byte order, swap in the rest of the header */
|
||
i_ehdrp = elf_elfheader (abfd);
|
||
elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp);
|
||
#if DEBUG & 1
|
||
elf_debug_file (i_ehdrp);
|
||
#endif
|
||
|
||
/* Reject ET_CORE (header indicates core file, not object file) */
|
||
if (i_ehdrp->e_type == ET_CORE)
|
||
goto got_wrong_format_error;
|
||
|
||
/* If there is no section header table, we're hosed. */
|
||
if (i_ehdrp->e_shoff == 0)
|
||
goto got_wrong_format_error;
|
||
|
||
/* As a simple sanity check, verify that the what BFD thinks is the
|
||
size of each section header table entry actually matches the size
|
||
recorded in the file. */
|
||
if (i_ehdrp->e_shentsize != sizeof (x_shdr))
|
||
goto got_wrong_format_error;
|
||
|
||
ebd = get_elf_backend_data (abfd);
|
||
|
||
/* Check that the ELF e_machine field matches what this particular
|
||
BFD format expects. */
|
||
if (ebd->elf_machine_code != i_ehdrp->e_machine
|
||
&& (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1)
|
||
&& (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2))
|
||
{
|
||
const bfd_target * const *target_ptr;
|
||
|
||
if (ebd->elf_machine_code != EM_NONE)
|
||
goto got_wrong_format_error;
|
||
|
||
/* This is the generic ELF target. Let it match any ELF target
|
||
for which we do not have a specific backend. */
|
||
for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++)
|
||
{
|
||
struct elf_backend_data *back;
|
||
|
||
if ((*target_ptr)->flavour != bfd_target_elf_flavour)
|
||
continue;
|
||
back = (struct elf_backend_data *) (*target_ptr)->backend_data;
|
||
if (back->elf_machine_code == i_ehdrp->e_machine
|
||
|| (back->elf_machine_alt1 != 0
|
||
&& back->elf_machine_alt1 == i_ehdrp->e_machine)
|
||
|| (back->elf_machine_alt2 != 0
|
||
&& back->elf_machine_alt2 == i_ehdrp->e_machine))
|
||
{
|
||
/* target_ptr is an ELF backend which matches this
|
||
object file, so reject the generic ELF target. */
|
||
goto got_wrong_format_error;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (i_ehdrp->e_type == ET_EXEC)
|
||
abfd->flags |= EXEC_P;
|
||
else if (i_ehdrp->e_type == ET_DYN)
|
||
abfd->flags |= DYNAMIC;
|
||
|
||
if (i_ehdrp->e_phnum > 0)
|
||
abfd->flags |= D_PAGED;
|
||
|
||
if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0))
|
||
{
|
||
/* It's OK if this fails for the generic target. */
|
||
if (ebd->elf_machine_code != EM_NONE)
|
||
goto got_no_match;
|
||
}
|
||
|
||
/* Remember the entry point specified in the ELF file header. */
|
||
bfd_set_start_address (abfd, i_ehdrp->e_entry);
|
||
|
||
/* Allocate space for a copy of the section header table in
|
||
internal form, seek to the section header table in the file,
|
||
read it in, and convert it to internal form. */
|
||
i_shdrp = ((Elf_Internal_Shdr *)
|
||
bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum));
|
||
elf_elfsections (abfd) = ((Elf_Internal_Shdr **)
|
||
bfd_alloc (abfd,
|
||
sizeof (i_shdrp) * i_ehdrp->e_shnum));
|
||
if (!i_shdrp || !elf_elfsections (abfd))
|
||
goto got_no_match;
|
||
if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0)
|
||
goto got_no_match;
|
||
for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++)
|
||
{
|
||
if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr))
|
||
goto got_no_match;
|
||
elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
|
||
elf_elfsections (abfd)[shindex] = i_shdrp + shindex;
|
||
|
||
/* If the section is loaded, but not page aligned, clear
|
||
D_PAGED. */
|
||
if ((i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0
|
||
&& i_shdrp[shindex].sh_type != SHT_NOBITS
|
||
&& (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset)
|
||
% ebd->maxpagesize)
|
||
!= 0))
|
||
abfd->flags &= ~D_PAGED;
|
||
}
|
||
if (i_ehdrp->e_shstrndx)
|
||
{
|
||
if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx))
|
||
goto got_no_match;
|
||
}
|
||
|
||
/* Read in the program headers. */
|
||
if (i_ehdrp->e_phnum == 0)
|
||
elf_tdata (abfd)->phdr = NULL;
|
||
else
|
||
{
|
||
Elf_Internal_Phdr *i_phdr;
|
||
unsigned int i;
|
||
|
||
elf_tdata (abfd)->phdr = ((Elf_Internal_Phdr *)
|
||
bfd_alloc (abfd,
|
||
(i_ehdrp->e_phnum
|
||
* sizeof (Elf_Internal_Phdr))));
|
||
if (elf_tdata (abfd)->phdr == NULL)
|
||
goto got_no_match;
|
||
if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0)
|
||
goto got_no_match;
|
||
i_phdr = elf_tdata (abfd)->phdr;
|
||
for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++)
|
||
{
|
||
Elf_External_Phdr x_phdr;
|
||
|
||
if (bfd_read ((PTR) &x_phdr, sizeof x_phdr, 1, abfd)
|
||
!= sizeof x_phdr)
|
||
goto got_no_match;
|
||
elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
|
||
}
|
||
}
|
||
|
||
/* Read in the string table containing the names of the sections. We
|
||
will need the base pointer to this table later. */
|
||
/* We read this inline now, so that we don't have to go through
|
||
bfd_section_from_shdr with it (since this particular strtab is
|
||
used to find all of the ELF section names.) */
|
||
|
||
shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx);
|
||
if (!shstrtab)
|
||
goto got_no_match;
|
||
|
||
/* Once all of the section headers have been read and converted, we
|
||
can start processing them. Note that the first section header is
|
||
a dummy placeholder entry, so we ignore it. */
|
||
|
||
for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
|
||
{
|
||
if (! bfd_section_from_shdr (abfd, shindex))
|
||
goto got_no_match;
|
||
}
|
||
|
||
/* Let the backend double check the format and override global
|
||
information. */
|
||
if (ebd->elf_backend_object_p)
|
||
{
|
||
if ((*ebd->elf_backend_object_p) (abfd) == false)
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* If we have created any reloc sections that are associated with
|
||
debugging sections, mark the reloc sections as debugging as well. */
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL
|
||
|| elf_section_data (s)->this_hdr.sh_type == SHT_RELA)
|
||
&& elf_section_data (s)->this_hdr.sh_info > 0)
|
||
{
|
||
unsigned long targ_index;
|
||
asection *targ_sec;
|
||
|
||
targ_index = elf_section_data (s)->this_hdr.sh_info;
|
||
targ_sec = bfd_section_from_elf_index (abfd, targ_index);
|
||
if (targ_sec != NULL
|
||
&& (targ_sec->flags & SEC_DEBUGGING) != 0)
|
||
s->flags |= SEC_DEBUGGING;
|
||
}
|
||
}
|
||
|
||
return (abfd->xvec);
|
||
|
||
got_wrong_format_error:
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
got_no_match:
|
||
if (new_tdata != NULL
|
||
&& new_tdata->elf_sect_ptr != NULL)
|
||
bfd_release (abfd, new_tdata->elf_sect_ptr);
|
||
if (i_shdrp != NULL)
|
||
bfd_release (abfd, i_shdrp);
|
||
if (new_tdata != NULL)
|
||
bfd_release (abfd, new_tdata);
|
||
elf_tdata (abfd) = preserved_tdata;
|
||
abfd->sections = preserved_sections;
|
||
abfd->section_count = preserved_section_count;
|
||
return (NULL);
|
||
}
|
||
|
||
/* ELF .o/exec file writing */
|
||
|
||
/* Write out the relocs. */
|
||
|
||
void
|
||
elf_write_relocs (abfd, sec, data)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
PTR data;
|
||
{
|
||
boolean *failedp = (boolean *) data;
|
||
Elf_Internal_Shdr *rela_hdr;
|
||
Elf_External_Rela *outbound_relocas;
|
||
Elf_External_Rel *outbound_relocs;
|
||
unsigned int idx;
|
||
int use_rela_p;
|
||
asymbol *last_sym = 0;
|
||
int last_sym_idx = 0;
|
||
|
||
/* If we have already failed, don't do anything. */
|
||
if (*failedp)
|
||
return;
|
||
|
||
if ((sec->flags & SEC_RELOC) == 0)
|
||
return;
|
||
|
||
/* The linker backend writes the relocs out itself, and sets the
|
||
reloc_count field to zero to inhibit writing them here. Also,
|
||
sometimes the SEC_RELOC flag gets set even when there aren't any
|
||
relocs. */
|
||
if (sec->reloc_count == 0)
|
||
return;
|
||
|
||
rela_hdr = &elf_section_data (sec)->rel_hdr;
|
||
|
||
rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
|
||
rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
|
||
if (rela_hdr->contents == NULL)
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
|
||
/* Figure out whether the relocations are RELA or REL relocations. */
|
||
if (rela_hdr->sh_type == SHT_RELA)
|
||
use_rela_p = true;
|
||
else if (rela_hdr->sh_type == SHT_REL)
|
||
use_rela_p = false;
|
||
else
|
||
/* Every relocation section should be either an SHT_RELA or an
|
||
SHT_REL section. */
|
||
abort ();
|
||
|
||
/* orelocation has the data, reloc_count has the count... */
|
||
if (use_rela_p)
|
||
{
|
||
outbound_relocas = (Elf_External_Rela *) rela_hdr->contents;
|
||
|
||
for (idx = 0; idx < sec->reloc_count; idx++)
|
||
{
|
||
Elf_Internal_Rela dst_rela;
|
||
Elf_External_Rela *src_rela;
|
||
arelent *ptr;
|
||
asymbol *sym;
|
||
int n;
|
||
|
||
ptr = sec->orelocation[idx];
|
||
src_rela = outbound_relocas + idx;
|
||
|
||
/* The address of an ELF reloc is section relative for an object
|
||
file, and absolute for an executable file or shared library.
|
||
The address of a BFD reloc is always section relative. */
|
||
if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
|
||
dst_rela.r_offset = ptr->address;
|
||
else
|
||
dst_rela.r_offset = ptr->address + sec->vma;
|
||
|
||
sym = *ptr->sym_ptr_ptr;
|
||
if (sym == last_sym)
|
||
n = last_sym_idx;
|
||
else if (bfd_is_abs_section (sym->section) && sym->value == 0)
|
||
n = STN_UNDEF;
|
||
else
|
||
{
|
||
last_sym = sym;
|
||
n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
|
||
if (n < 0)
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
last_sym_idx = n;
|
||
}
|
||
|
||
if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
|
||
&& (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
|
||
&& ! _bfd_elf_validate_reloc (abfd, ptr))
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
|
||
dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
|
||
|
||
dst_rela.r_addend = ptr->addend;
|
||
elf_swap_reloca_out (abfd, &dst_rela, src_rela);
|
||
}
|
||
}
|
||
else
|
||
/* REL relocations */
|
||
{
|
||
outbound_relocs = (Elf_External_Rel *) rela_hdr->contents;
|
||
|
||
for (idx = 0; idx < sec->reloc_count; idx++)
|
||
{
|
||
Elf_Internal_Rel dst_rel;
|
||
Elf_External_Rel *src_rel;
|
||
arelent *ptr;
|
||
int n;
|
||
asymbol *sym;
|
||
|
||
ptr = sec->orelocation[idx];
|
||
sym = *ptr->sym_ptr_ptr;
|
||
src_rel = outbound_relocs + idx;
|
||
|
||
/* The address of an ELF reloc is section relative for an object
|
||
file, and absolute for an executable file or shared library.
|
||
The address of a BFD reloc is always section relative. */
|
||
if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
|
||
dst_rel.r_offset = ptr->address;
|
||
else
|
||
dst_rel.r_offset = ptr->address + sec->vma;
|
||
|
||
if (sym == last_sym)
|
||
n = last_sym_idx;
|
||
else if (bfd_is_abs_section (sym->section) && sym->value == 0)
|
||
n = STN_UNDEF;
|
||
else
|
||
{
|
||
last_sym = sym;
|
||
n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
|
||
if (n < 0)
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
last_sym_idx = n;
|
||
}
|
||
|
||
if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
|
||
&& (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
|
||
&& ! _bfd_elf_validate_reloc (abfd, ptr))
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
|
||
dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type);
|
||
|
||
elf_swap_reloc_out (abfd, &dst_rel, src_rel);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Write out the program headers. */
|
||
|
||
int
|
||
elf_write_out_phdrs (abfd, phdr, count)
|
||
bfd *abfd;
|
||
const Elf_Internal_Phdr *phdr;
|
||
int count;
|
||
{
|
||
while (count--)
|
||
{
|
||
Elf_External_Phdr extphdr;
|
||
elf_swap_phdr_out (abfd, phdr, &extphdr);
|
||
if (bfd_write (&extphdr, sizeof (Elf_External_Phdr), 1, abfd)
|
||
!= sizeof (Elf_External_Phdr))
|
||
return -1;
|
||
phdr++;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Write out the section headers and the ELF file header. */
|
||
|
||
boolean
|
||
elf_write_shdrs_and_ehdr (abfd)
|
||
bfd *abfd;
|
||
{
|
||
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
|
||
Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */
|
||
Elf_External_Shdr *x_shdrp; /* Section header table, external form */
|
||
Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
|
||
unsigned int count;
|
||
|
||
i_ehdrp = elf_elfheader (abfd);
|
||
i_shdrp = elf_elfsections (abfd);
|
||
|
||
/* swap the header before spitting it out... */
|
||
|
||
#if DEBUG & 1
|
||
elf_debug_file (i_ehdrp);
|
||
#endif
|
||
elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr);
|
||
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
|
||
|| (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd)
|
||
!= sizeof (x_ehdr)))
|
||
return false;
|
||
|
||
/* at this point we've concocted all the ELF sections... */
|
||
x_shdrp = (Elf_External_Shdr *)
|
||
bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum));
|
||
if (!x_shdrp)
|
||
return false;
|
||
|
||
for (count = 0; count < i_ehdrp->e_shnum; count++)
|
||
{
|
||
#if DEBUG & 2
|
||
elf_debug_section (count, i_shdrp[count]);
|
||
#endif
|
||
elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count);
|
||
}
|
||
if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
|
||
|| (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd)
|
||
!= sizeof (*x_shdrp) * i_ehdrp->e_shnum))
|
||
return false;
|
||
|
||
/* need to dump the string table too... */
|
||
|
||
return true;
|
||
}
|
||
|
||
long
|
||
elf_slurp_symbol_table (abfd, symptrs, dynamic)
|
||
bfd *abfd;
|
||
asymbol **symptrs; /* Buffer for generated bfd symbols */
|
||
boolean dynamic;
|
||
{
|
||
Elf_Internal_Shdr *hdr;
|
||
Elf_Internal_Shdr *verhdr;
|
||
unsigned long symcount; /* Number of external ELF symbols */
|
||
elf_symbol_type *sym; /* Pointer to current bfd symbol */
|
||
elf_symbol_type *symbase; /* Buffer for generated bfd symbols */
|
||
Elf_Internal_Sym i_sym;
|
||
Elf_External_Sym *x_symp = NULL;
|
||
Elf_External_Versym *x_versymp = NULL;
|
||
|
||
/* Read each raw ELF symbol, converting from external ELF form to
|
||
internal ELF form, and then using the information to create a
|
||
canonical bfd symbol table entry.
|
||
|
||
Note that we allocate the initial bfd canonical symbol buffer
|
||
based on a one-to-one mapping of the ELF symbols to canonical
|
||
symbols. We actually use all the ELF symbols, so there will be no
|
||
space left over at the end. When we have all the symbols, we
|
||
build the caller's pointer vector. */
|
||
|
||
if (! dynamic)
|
||
{
|
||
hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
verhdr = NULL;
|
||
}
|
||
else
|
||
{
|
||
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
|
||
if (elf_dynversym (abfd) == 0)
|
||
verhdr = NULL;
|
||
else
|
||
verhdr = &elf_tdata (abfd)->dynversym_hdr;
|
||
if ((elf_tdata (abfd)->dynverdef_section != 0
|
||
&& elf_tdata (abfd)->verdef == NULL)
|
||
|| (elf_tdata (abfd)->dynverref_section != 0
|
||
&& elf_tdata (abfd)->verref == NULL))
|
||
{
|
||
if (! _bfd_elf_slurp_version_tables (abfd))
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
|
||
return -1;
|
||
|
||
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
|
||
|
||
if (symcount == 0)
|
||
sym = symbase = NULL;
|
||
else
|
||
{
|
||
unsigned long i;
|
||
|
||
if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1)
|
||
return -1;
|
||
|
||
symbase = ((elf_symbol_type *)
|
||
bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type)));
|
||
if (symbase == (elf_symbol_type *) NULL)
|
||
return -1;
|
||
sym = symbase;
|
||
|
||
/* Temporarily allocate room for the raw ELF symbols. */
|
||
x_symp = ((Elf_External_Sym *)
|
||
bfd_malloc (symcount * sizeof (Elf_External_Sym)));
|
||
if (x_symp == NULL && symcount != 0)
|
||
goto error_return;
|
||
|
||
if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd)
|
||
!= symcount * sizeof (Elf_External_Sym))
|
||
goto error_return;
|
||
|
||
/* Read the raw ELF version symbol information. */
|
||
|
||
if (verhdr != NULL
|
||
&& verhdr->sh_size / sizeof (Elf_External_Versym) != symcount)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: version count (%ld) does not match symbol count (%ld)"),
|
||
abfd->filename,
|
||
(long) (verhdr->sh_size / sizeof (Elf_External_Versym)),
|
||
symcount);
|
||
|
||
/* Slurp in the symbols without the version information,
|
||
since that is more helpful than just quitting. */
|
||
verhdr = NULL;
|
||
}
|
||
|
||
if (verhdr != NULL)
|
||
{
|
||
if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0)
|
||
goto error_return;
|
||
|
||
x_versymp = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size);
|
||
if (x_versymp == NULL && verhdr->sh_size != 0)
|
||
goto error_return;
|
||
|
||
if (bfd_read ((PTR) x_versymp, 1, verhdr->sh_size, abfd)
|
||
!= verhdr->sh_size)
|
||
goto error_return;
|
||
}
|
||
|
||
/* Skip first symbol, which is a null dummy. */
|
||
for (i = 1; i < symcount; i++)
|
||
{
|
||
elf_swap_symbol_in (abfd, x_symp + i, &i_sym);
|
||
memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym));
|
||
#ifdef ELF_KEEP_EXTSYM
|
||
memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym));
|
||
#endif
|
||
sym->symbol.the_bfd = abfd;
|
||
|
||
sym->symbol.name = bfd_elf_string_from_elf_section (abfd,
|
||
hdr->sh_link,
|
||
i_sym.st_name);
|
||
|
||
sym->symbol.value = i_sym.st_value;
|
||
|
||
if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE)
|
||
{
|
||
sym->symbol.section = section_from_elf_index (abfd,
|
||
i_sym.st_shndx);
|
||
if (sym->symbol.section == NULL)
|
||
{
|
||
/* This symbol is in a section for which we did not
|
||
create a BFD section. Just use bfd_abs_section,
|
||
although it is wrong. FIXME. */
|
||
sym->symbol.section = bfd_abs_section_ptr;
|
||
}
|
||
}
|
||
else if (i_sym.st_shndx == SHN_ABS)
|
||
{
|
||
sym->symbol.section = bfd_abs_section_ptr;
|
||
}
|
||
else if (i_sym.st_shndx == SHN_COMMON)
|
||
{
|
||
sym->symbol.section = bfd_com_section_ptr;
|
||
/* Elf puts the alignment into the `value' field, and
|
||
the size into the `size' field. BFD wants to see the
|
||
size in the value field, and doesn't care (at the
|
||
moment) about the alignment. */
|
||
sym->symbol.value = i_sym.st_size;
|
||
}
|
||
else if (i_sym.st_shndx == SHN_UNDEF)
|
||
{
|
||
sym->symbol.section = bfd_und_section_ptr;
|
||
}
|
||
else
|
||
sym->symbol.section = bfd_abs_section_ptr;
|
||
|
||
/* If this is a relocateable file, then the symbol value is
|
||
already section relative. */
|
||
if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
sym->symbol.value -= sym->symbol.section->vma;
|
||
|
||
switch (ELF_ST_BIND (i_sym.st_info))
|
||
{
|
||
case STB_LOCAL:
|
||
sym->symbol.flags |= BSF_LOCAL;
|
||
break;
|
||
case STB_GLOBAL:
|
||
if (i_sym.st_shndx != SHN_UNDEF
|
||
&& i_sym.st_shndx != SHN_COMMON)
|
||
sym->symbol.flags |= BSF_GLOBAL;
|
||
break;
|
||
case STB_WEAK:
|
||
sym->symbol.flags |= BSF_WEAK;
|
||
break;
|
||
}
|
||
|
||
switch (ELF_ST_TYPE (i_sym.st_info))
|
||
{
|
||
case STT_SECTION:
|
||
sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
|
||
break;
|
||
case STT_FILE:
|
||
sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
|
||
break;
|
||
case STT_FUNC:
|
||
sym->symbol.flags |= BSF_FUNCTION;
|
||
break;
|
||
case STT_OBJECT:
|
||
sym->symbol.flags |= BSF_OBJECT;
|
||
break;
|
||
}
|
||
|
||
if (dynamic)
|
||
sym->symbol.flags |= BSF_DYNAMIC;
|
||
|
||
if (x_versymp != NULL)
|
||
{
|
||
Elf_Internal_Versym iversym;
|
||
|
||
_bfd_elf_swap_versym_in (abfd, x_versymp + i, &iversym);
|
||
sym->version = iversym.vs_vers;
|
||
}
|
||
|
||
/* Do some backend-specific processing on this symbol. */
|
||
{
|
||
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
|
||
if (ebd->elf_backend_symbol_processing)
|
||
(*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
|
||
}
|
||
|
||
sym++;
|
||
}
|
||
}
|
||
|
||
/* Do some backend-specific processing on this symbol table. */
|
||
{
|
||
struct elf_backend_data *ebd = get_elf_backend_data (abfd);
|
||
if (ebd->elf_backend_symbol_table_processing)
|
||
(*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount);
|
||
}
|
||
|
||
/* We rely on the zalloc to clear out the final symbol entry. */
|
||
|
||
symcount = sym - symbase;
|
||
|
||
/* Fill in the user's symbol pointer vector if needed. */
|
||
if (symptrs)
|
||
{
|
||
long l = symcount;
|
||
|
||
sym = symbase;
|
||
while (l-- > 0)
|
||
{
|
||
*symptrs++ = &sym->symbol;
|
||
sym++;
|
||
}
|
||
*symptrs = 0; /* Final null pointer */
|
||
}
|
||
|
||
if (x_versymp != NULL)
|
||
free (x_versymp);
|
||
if (x_symp != NULL)
|
||
free (x_symp);
|
||
return symcount;
|
||
error_return:
|
||
if (x_versymp != NULL)
|
||
free (x_versymp);
|
||
if (x_symp != NULL)
|
||
free (x_symp);
|
||
return -1;
|
||
}
|
||
|
||
/* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
|
||
them. */
|
||
|
||
static boolean
|
||
elf_slurp_reloc_table_from_section (abfd, asect, rel_hdr, reloc_count,
|
||
relents, symbols, dynamic)
|
||
bfd *abfd;
|
||
asection *asect;
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
bfd_size_type reloc_count;
|
||
arelent *relents;
|
||
asymbol **symbols;
|
||
boolean dynamic;
|
||
{
|
||
struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
|
||
PTR allocated = NULL;
|
||
bfd_byte *native_relocs;
|
||
arelent *relent;
|
||
unsigned int i;
|
||
int entsize;
|
||
|
||
allocated = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size);
|
||
if (allocated == NULL)
|
||
goto error_return;
|
||
|
||
if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_read (allocated, 1, rel_hdr->sh_size, abfd)
|
||
!= rel_hdr->sh_size))
|
||
goto error_return;
|
||
|
||
native_relocs = (bfd_byte *) allocated;
|
||
|
||
entsize = rel_hdr->sh_entsize;
|
||
BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
|
||
|| entsize == sizeof (Elf_External_Rela));
|
||
|
||
for (i = 0, relent = relents;
|
||
i < reloc_count;
|
||
i++, relent++, native_relocs += entsize)
|
||
{
|
||
Elf_Internal_Rela rela;
|
||
Elf_Internal_Rel rel;
|
||
|
||
if (entsize == sizeof (Elf_External_Rela))
|
||
elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela);
|
||
else
|
||
{
|
||
elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel);
|
||
rela.r_offset = rel.r_offset;
|
||
rela.r_info = rel.r_info;
|
||
rela.r_addend = 0;
|
||
}
|
||
|
||
/* The address of an ELF reloc is section relative for an object
|
||
file, and absolute for an executable file or shared library.
|
||
The address of a normal BFD reloc is always section relative,
|
||
and the address of a dynamic reloc is absolute.. */
|
||
if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic)
|
||
relent->address = rela.r_offset;
|
||
else
|
||
relent->address = rela.r_offset - asect->vma;
|
||
|
||
if (ELF_R_SYM (rela.r_info) == 0)
|
||
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
|
||
else
|
||
{
|
||
asymbol **ps, *s;
|
||
|
||
ps = symbols + ELF_R_SYM (rela.r_info) - 1;
|
||
s = *ps;
|
||
|
||
/* Canonicalize ELF section symbols. FIXME: Why? */
|
||
if ((s->flags & BSF_SECTION_SYM) == 0)
|
||
relent->sym_ptr_ptr = ps;
|
||
else
|
||
relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
|
||
}
|
||
|
||
relent->addend = rela.r_addend;
|
||
|
||
if (entsize == sizeof (Elf_External_Rela))
|
||
(*ebd->elf_info_to_howto) (abfd, relent, &rela);
|
||
else
|
||
(*ebd->elf_info_to_howto_rel) (abfd, relent, &rel);
|
||
}
|
||
|
||
if (allocated != NULL)
|
||
free (allocated);
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (allocated != NULL)
|
||
free (allocated);
|
||
return false;
|
||
}
|
||
|
||
/* Read in and swap the external relocs. */
|
||
|
||
boolean
|
||
elf_slurp_reloc_table (abfd, asect, symbols, dynamic)
|
||
bfd *abfd;
|
||
asection *asect;
|
||
asymbol **symbols;
|
||
boolean dynamic;
|
||
{
|
||
struct bfd_elf_section_data * const d = elf_section_data (asect);
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
Elf_Internal_Shdr *rel_hdr2;
|
||
bfd_size_type reloc_count;
|
||
bfd_size_type reloc_count2;
|
||
arelent *relents;
|
||
|
||
if (asect->relocation != NULL)
|
||
return true;
|
||
|
||
if (! dynamic)
|
||
{
|
||
if ((asect->flags & SEC_RELOC) == 0
|
||
|| asect->reloc_count == 0)
|
||
return true;
|
||
|
||
rel_hdr = &d->rel_hdr;
|
||
reloc_count = rel_hdr->sh_size / rel_hdr->sh_entsize;
|
||
rel_hdr2 = d->rel_hdr2;
|
||
reloc_count2 = (rel_hdr2
|
||
? (rel_hdr2->sh_size / rel_hdr2->sh_entsize)
|
||
: 0);
|
||
|
||
BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2);
|
||
BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset
|
||
|| (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));
|
||
|
||
}
|
||
else
|
||
{
|
||
/* Note that ASECT->RELOC_COUNT tends not to be accurate in this
|
||
case because relocations against this section may use the
|
||
dynamic symbol table, and in that case bfd_section_from_shdr
|
||
in elf.c does not update the RELOC_COUNT. */
|
||
if (asect->_raw_size == 0)
|
||
return true;
|
||
|
||
rel_hdr = &d->this_hdr;
|
||
reloc_count = rel_hdr->sh_size / rel_hdr->sh_entsize;
|
||
rel_hdr2 = NULL;
|
||
reloc_count2 = 0;
|
||
}
|
||
|
||
relents = ((arelent *)
|
||
bfd_alloc (abfd,
|
||
(reloc_count + reloc_count2) * sizeof (arelent)));
|
||
if (relents == NULL)
|
||
return false;
|
||
|
||
if (!elf_slurp_reloc_table_from_section (abfd, asect,
|
||
rel_hdr, reloc_count,
|
||
relents,
|
||
symbols, dynamic))
|
||
return false;
|
||
|
||
if (rel_hdr2
|
||
&& !elf_slurp_reloc_table_from_section (abfd, asect,
|
||
rel_hdr2, reloc_count2,
|
||
relents + reloc_count,
|
||
symbols, dynamic))
|
||
return false;
|
||
|
||
|
||
asect->relocation = relents;
|
||
return true;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
static void
|
||
elf_debug_section (num, hdr)
|
||
int num;
|
||
Elf_Internal_Shdr *hdr;
|
||
{
|
||
fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num,
|
||
hdr->bfd_section != NULL ? hdr->bfd_section->name : "",
|
||
(long) hdr);
|
||
fprintf (stderr,
|
||
"sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n",
|
||
(long) hdr->sh_name,
|
||
(long) hdr->sh_type,
|
||
(long) hdr->sh_flags);
|
||
fprintf (stderr,
|
||
"sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n",
|
||
(long) hdr->sh_addr,
|
||
(long) hdr->sh_offset,
|
||
(long) hdr->sh_size);
|
||
fprintf (stderr,
|
||
"sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n",
|
||
(long) hdr->sh_link,
|
||
(long) hdr->sh_info,
|
||
(long) hdr->sh_addralign);
|
||
fprintf (stderr, "sh_entsize = %ld\n",
|
||
(long) hdr->sh_entsize);
|
||
fflush (stderr);
|
||
}
|
||
|
||
static void
|
||
elf_debug_file (ehdrp)
|
||
Elf_Internal_Ehdr *ehdrp;
|
||
{
|
||
fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry);
|
||
fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff);
|
||
fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum);
|
||
fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize);
|
||
fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff);
|
||
fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum);
|
||
fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize);
|
||
}
|
||
|
||
static char *
|
||
elf_symbol_flags (flags)
|
||
flagword flags;
|
||
{
|
||
static char buffer[1024];
|
||
|
||
buffer[0] = '\0';
|
||
if (flags & BSF_LOCAL)
|
||
strcat (buffer, " local");
|
||
|
||
if (flags & BSF_GLOBAL)
|
||
strcat (buffer, " global");
|
||
|
||
if (flags & BSF_DEBUGGING)
|
||
strcat (buffer, " debug");
|
||
|
||
if (flags & BSF_FUNCTION)
|
||
strcat (buffer, " function");
|
||
|
||
if (flags & BSF_KEEP)
|
||
strcat (buffer, " keep");
|
||
|
||
if (flags & BSF_KEEP_G)
|
||
strcat (buffer, " keep_g");
|
||
|
||
if (flags & BSF_WEAK)
|
||
strcat (buffer, " weak");
|
||
|
||
if (flags & BSF_SECTION_SYM)
|
||
strcat (buffer, " section-sym");
|
||
|
||
if (flags & BSF_OLD_COMMON)
|
||
strcat (buffer, " old-common");
|
||
|
||
if (flags & BSF_NOT_AT_END)
|
||
strcat (buffer, " not-at-end");
|
||
|
||
if (flags & BSF_CONSTRUCTOR)
|
||
strcat (buffer, " constructor");
|
||
|
||
if (flags & BSF_WARNING)
|
||
strcat (buffer, " warning");
|
||
|
||
if (flags & BSF_INDIRECT)
|
||
strcat (buffer, " indirect");
|
||
|
||
if (flags & BSF_FILE)
|
||
strcat (buffer, " file");
|
||
|
||
if (flags & DYNAMIC)
|
||
strcat (buffer, " dynamic");
|
||
|
||
if (flags & ~(BSF_LOCAL
|
||
| BSF_GLOBAL
|
||
| BSF_DEBUGGING
|
||
| BSF_FUNCTION
|
||
| BSF_KEEP
|
||
| BSF_KEEP_G
|
||
| BSF_WEAK
|
||
| BSF_SECTION_SYM
|
||
| BSF_OLD_COMMON
|
||
| BSF_NOT_AT_END
|
||
| BSF_CONSTRUCTOR
|
||
| BSF_WARNING
|
||
| BSF_INDIRECT
|
||
| BSF_FILE
|
||
| BSF_DYNAMIC))
|
||
strcat (buffer, " unknown-bits");
|
||
|
||
return buffer;
|
||
}
|
||
#endif
|
||
|
||
#include "elfcore.h"
|
||
#include "elflink.h"
|
||
|
||
/* Size-dependent data and functions. */
|
||
const struct elf_size_info NAME(_bfd_elf,size_info) = {
|
||
sizeof (Elf_External_Ehdr),
|
||
sizeof (Elf_External_Phdr),
|
||
sizeof (Elf_External_Shdr),
|
||
sizeof (Elf_External_Rel),
|
||
sizeof (Elf_External_Rela),
|
||
sizeof (Elf_External_Sym),
|
||
sizeof (Elf_External_Dyn),
|
||
sizeof (Elf_External_Note),
|
||
4,
|
||
1,
|
||
ARCH_SIZE, FILE_ALIGN,
|
||
ELFCLASS, EV_CURRENT,
|
||
elf_write_out_phdrs,
|
||
elf_write_shdrs_and_ehdr,
|
||
elf_write_relocs,
|
||
elf_swap_symbol_out,
|
||
elf_slurp_reloc_table,
|
||
elf_slurp_symbol_table,
|
||
elf_swap_dyn_in,
|
||
elf_swap_dyn_out,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
NULL
|
||
};
|