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c45c3dba8c
Catch fuzzed segments where p_offset + p_filesz wraps, and limit error output. * elfcore.h (elf_core_file_p): Rewrite segment checks using bfd_get_file_size. Set read_only on file size errors. * elfcode.h (elf_swap_shdr_in): Don't repeat error message.
1985 lines
60 KiB
C
1985 lines
60 KiB
C
/* ELF executable support for BFD.
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Copyright (C) 1991-2021 Free 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, 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 "sysdep.h"
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#include "bfd.h"
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#include "libiberty.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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#include "libiberty.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_core_file_pid NAME(bfd_elf,core_file_pid)
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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_canonicalize_symtab NAME(bfd_elf,canonicalize_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_get_synthetic_symtab \
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NAME(bfd_elf,get_synthetic_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_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_checksum_contents NAME(bfd_elf,checksum_contents)
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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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#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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#if DEBUG & 2
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static void elf_debug_section (int, Elf_Internal_Shdr *);
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#endif
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#if DEBUG & 1
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static void elf_debug_file (Elf_Internal_Ehdr *);
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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 H_PUT_WORD H_PUT_64
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#define H_PUT_SIGNED_WORD H_PUT_S64
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#define H_GET_WORD H_GET_64
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#define H_GET_SIGNED_WORD H_GET_S64
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#endif
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#if ARCH_SIZE == 32
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#define H_PUT_WORD H_PUT_32
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#define H_PUT_SIGNED_WORD H_PUT_S32
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#define H_GET_WORD H_GET_32
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#define H_GET_SIGNED_WORD H_GET_S32
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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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bool
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elf_swap_symbol_in (bfd *abfd,
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const void *psrc,
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const void *pshn,
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Elf_Internal_Sym *dst)
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{
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const Elf_External_Sym *src = (const Elf_External_Sym *) psrc;
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const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn;
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int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma;
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dst->st_name = H_GET_32 (abfd, src->st_name);
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if (signed_vma)
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dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value);
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else
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dst->st_value = H_GET_WORD (abfd, src->st_value);
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dst->st_size = H_GET_WORD (abfd, src->st_size);
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dst->st_info = H_GET_8 (abfd, src->st_info);
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dst->st_other = H_GET_8 (abfd, src->st_other);
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dst->st_shndx = H_GET_16 (abfd, src->st_shndx);
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if (dst->st_shndx == (SHN_XINDEX & 0xffff))
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{
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if (shndx == NULL)
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return false;
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dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx);
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}
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else if (dst->st_shndx >= (SHN_LORESERVE & 0xffff))
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dst->st_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff);
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dst->st_target_internal = 0;
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return true;
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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 (bfd *abfd,
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const Elf_Internal_Sym *src,
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void *cdst,
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void *shndx)
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{
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unsigned int tmp;
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Elf_External_Sym *dst = (Elf_External_Sym *) cdst;
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H_PUT_32 (abfd, src->st_name, dst->st_name);
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H_PUT_WORD (abfd, src->st_value, dst->st_value);
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H_PUT_WORD (abfd, src->st_size, dst->st_size);
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H_PUT_8 (abfd, src->st_info, dst->st_info);
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H_PUT_8 (abfd, src->st_other, dst->st_other);
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tmp = src->st_shndx;
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if (tmp >= (SHN_LORESERVE & 0xffff) && tmp < SHN_LORESERVE)
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{
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if (shndx == NULL)
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abort ();
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H_PUT_32 (abfd, tmp, shndx);
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tmp = SHN_XINDEX & 0xffff;
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}
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H_PUT_16 (abfd, tmp, 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 (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 = H_GET_16 (abfd, src->e_type);
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dst->e_machine = H_GET_16 (abfd, src->e_machine);
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dst->e_version = H_GET_32 (abfd, src->e_version);
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if (signed_vma)
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dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry);
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else
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dst->e_entry = H_GET_WORD (abfd, src->e_entry);
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dst->e_phoff = H_GET_WORD (abfd, src->e_phoff);
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dst->e_shoff = H_GET_WORD (abfd, src->e_shoff);
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dst->e_flags = H_GET_32 (abfd, src->e_flags);
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dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize);
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dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize);
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dst->e_phnum = H_GET_16 (abfd, src->e_phnum);
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dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize);
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dst->e_shnum = H_GET_16 (abfd, src->e_shnum);
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dst->e_shstrndx = H_GET_16 (abfd, 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 (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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unsigned int tmp;
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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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H_PUT_16 (abfd, src->e_type, dst->e_type);
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H_PUT_16 (abfd, src->e_machine, dst->e_machine);
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H_PUT_32 (abfd, src->e_version, dst->e_version);
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if (signed_vma)
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H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry);
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else
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H_PUT_WORD (abfd, src->e_entry, dst->e_entry);
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H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff);
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H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff);
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H_PUT_32 (abfd, src->e_flags, dst->e_flags);
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H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize);
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H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize);
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tmp = src->e_phnum;
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if (tmp > PN_XNUM)
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tmp = PN_XNUM;
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H_PUT_16 (abfd, tmp, dst->e_phnum);
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H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize);
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tmp = src->e_shnum;
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if (tmp >= (SHN_LORESERVE & 0xffff))
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tmp = SHN_UNDEF;
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H_PUT_16 (abfd, tmp, dst->e_shnum);
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tmp = src->e_shstrndx;
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if (tmp >= (SHN_LORESERVE & 0xffff))
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tmp = SHN_XINDEX & 0xffff;
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H_PUT_16 (abfd, tmp, 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 (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 = H_GET_32 (abfd, src->sh_name);
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dst->sh_type = H_GET_32 (abfd, src->sh_type);
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dst->sh_flags = H_GET_WORD (abfd, src->sh_flags);
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if (signed_vma)
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dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr);
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else
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dst->sh_addr = H_GET_WORD (abfd, src->sh_addr);
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dst->sh_offset = H_GET_WORD (abfd, src->sh_offset);
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dst->sh_size = H_GET_WORD (abfd, src->sh_size);
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/* PR 23657. Check for invalid section size, in sections with contents.
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Note - we do not set an error value here because the contents
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of this particular section might not be needed by the consumer. */
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if (dst->sh_type != SHT_NOBITS)
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{
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ufile_ptr filesize = bfd_get_file_size (abfd);
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if (filesize != 0
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&& ((ufile_ptr) dst->sh_offset > filesize
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|| dst->sh_size > filesize - dst->sh_offset))
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{
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if (!abfd->read_only)
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_bfd_error_handler (_("warning: %pB has a section "
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"extending past end of file"), abfd);
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abfd->read_only = 1;
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}
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}
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dst->sh_link = H_GET_32 (abfd, src->sh_link);
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dst->sh_info = H_GET_32 (abfd, src->sh_info);
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dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign);
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dst->sh_entsize = H_GET_WORD (abfd, 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 (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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H_PUT_32 (abfd, src->sh_name, dst->sh_name);
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H_PUT_32 (abfd, src->sh_type, dst->sh_type);
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H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags);
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H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr);
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H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset);
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H_PUT_WORD (abfd, src->sh_size, dst->sh_size);
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H_PUT_32 (abfd, src->sh_link, dst->sh_link);
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H_PUT_32 (abfd, src->sh_info, dst->sh_info);
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H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign);
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H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize);
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}
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/* Translate an ELF program header table entry in external format into an
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ELF program header table entry in internal format. */
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void
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elf_swap_phdr_in (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 = H_GET_32 (abfd, src->p_type);
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dst->p_flags = H_GET_32 (abfd, src->p_flags);
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dst->p_offset = H_GET_WORD (abfd, src->p_offset);
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if (signed_vma)
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{
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dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr);
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dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr);
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}
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else
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{
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dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr);
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dst->p_paddr = H_GET_WORD (abfd, src->p_paddr);
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}
|
||
dst->p_filesz = H_GET_WORD (abfd, src->p_filesz);
|
||
dst->p_memsz = H_GET_WORD (abfd, src->p_memsz);
|
||
dst->p_align = H_GET_WORD (abfd, src->p_align);
|
||
}
|
||
|
||
void
|
||
elf_swap_phdr_out (bfd *abfd,
|
||
const Elf_Internal_Phdr *src,
|
||
Elf_External_Phdr *dst)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
bfd_vma p_paddr;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
p_paddr = bed->want_p_paddr_set_to_zero ? 0 : src->p_paddr;
|
||
|
||
/* note that all elements of dst are *arrays of unsigned char* already... */
|
||
H_PUT_32 (abfd, src->p_type, dst->p_type);
|
||
H_PUT_WORD (abfd, src->p_offset, dst->p_offset);
|
||
H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr);
|
||
H_PUT_WORD (abfd, p_paddr, dst->p_paddr);
|
||
H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz);
|
||
H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz);
|
||
H_PUT_32 (abfd, src->p_flags, dst->p_flags);
|
||
H_PUT_WORD (abfd, src->p_align, dst->p_align);
|
||
}
|
||
|
||
/* Translate an ELF reloc from external format to internal format. */
|
||
void
|
||
elf_swap_reloc_in (bfd *abfd,
|
||
const bfd_byte *s,
|
||
Elf_Internal_Rela *dst)
|
||
{
|
||
const Elf_External_Rel *src = (const Elf_External_Rel *) s;
|
||
dst->r_offset = H_GET_WORD (abfd, src->r_offset);
|
||
dst->r_info = H_GET_WORD (abfd, src->r_info);
|
||
dst->r_addend = 0;
|
||
}
|
||
|
||
void
|
||
elf_swap_reloca_in (bfd *abfd,
|
||
const bfd_byte *s,
|
||
Elf_Internal_Rela *dst)
|
||
{
|
||
const Elf_External_Rela *src = (const Elf_External_Rela *) s;
|
||
dst->r_offset = H_GET_WORD (abfd, src->r_offset);
|
||
dst->r_info = H_GET_WORD (abfd, src->r_info);
|
||
dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend);
|
||
}
|
||
|
||
/* Translate an ELF reloc from internal format to external format. */
|
||
void
|
||
elf_swap_reloc_out (bfd *abfd,
|
||
const Elf_Internal_Rela *src,
|
||
bfd_byte *d)
|
||
{
|
||
Elf_External_Rel *dst = (Elf_External_Rel *) d;
|
||
H_PUT_WORD (abfd, src->r_offset, dst->r_offset);
|
||
H_PUT_WORD (abfd, src->r_info, dst->r_info);
|
||
}
|
||
|
||
void
|
||
elf_swap_reloca_out (bfd *abfd,
|
||
const Elf_Internal_Rela *src,
|
||
bfd_byte *d)
|
||
{
|
||
Elf_External_Rela *dst = (Elf_External_Rela *) d;
|
||
H_PUT_WORD (abfd, src->r_offset, dst->r_offset);
|
||
H_PUT_WORD (abfd, src->r_info, dst->r_info);
|
||
H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend);
|
||
}
|
||
|
||
void
|
||
elf_swap_dyn_in (bfd *abfd,
|
||
const void *p,
|
||
Elf_Internal_Dyn *dst)
|
||
{
|
||
const Elf_External_Dyn *src = (const Elf_External_Dyn *) p;
|
||
|
||
dst->d_tag = H_GET_WORD (abfd, src->d_tag);
|
||
dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val);
|
||
}
|
||
|
||
void
|
||
elf_swap_dyn_out (bfd *abfd,
|
||
const Elf_Internal_Dyn *src,
|
||
void *p)
|
||
{
|
||
Elf_External_Dyn *dst = (Elf_External_Dyn *) p;
|
||
|
||
H_PUT_WORD (abfd, src->d_tag, dst->d_tag);
|
||
H_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 bool
|
||
elf_file_p (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. */
|
||
|
||
bfd_cleanup
|
||
elf_object_p (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_shdr;
|
||
Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
|
||
unsigned int shindex;
|
||
const struct elf_backend_data *ebd;
|
||
asection *s;
|
||
const bfd_target *target;
|
||
|
||
/* Read in the ELF header in external format. */
|
||
|
||
if (bfd_bread (&x_ehdr, sizeof (x_ehdr), 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)
|
||
|| 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;
|
||
}
|
||
|
||
target = abfd->xvec;
|
||
|
||
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
|
||
the tdata pointer in the bfd. */
|
||
|
||
if (! (*target->_bfd_set_format[bfd_object]) (abfd))
|
||
goto got_no_match;
|
||
|
||
/* 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 this is a relocatable file and there is no section header
|
||
table, then we're hosed. */
|
||
if (i_ehdrp->e_shoff < sizeof (x_ehdr) && i_ehdrp->e_type == ET_REL)
|
||
goto got_wrong_format_error;
|
||
|
||
/* As a simple sanity check, verify that what BFD thinks is the
|
||
size of each section header table entry actually matches the size
|
||
recorded in the file, but only if there are any sections. */
|
||
if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0)
|
||
goto got_wrong_format_error;
|
||
|
||
/* Further sanity check. */
|
||
if (i_ehdrp->e_shoff < sizeof (x_ehdr) && i_ehdrp->e_shnum != 0)
|
||
goto got_wrong_format_error;
|
||
|
||
ebd = get_elf_backend_data (abfd);
|
||
if (ebd->s->arch_size != ARCH_SIZE)
|
||
goto got_wrong_format_error;
|
||
|
||
/* 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)
|
||
&& ebd->elf_machine_code != EM_NONE)
|
||
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;
|
||
}
|
||
|
||
if (ebd->elf_machine_code != EM_NONE
|
||
&& i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi
|
||
&& ebd->elf_osabi != ELFOSABI_NONE)
|
||
goto got_wrong_format_error;
|
||
|
||
if (i_ehdrp->e_shoff >= sizeof (x_ehdr))
|
||
{
|
||
file_ptr where = (file_ptr) i_ehdrp->e_shoff;
|
||
|
||
/* Seek to the section header table in the file. */
|
||
if (bfd_seek (abfd, where, SEEK_SET) != 0)
|
||
goto got_no_match;
|
||
|
||
/* Read the first section header at index 0, and convert to internal
|
||
form. */
|
||
if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
|
||
goto got_no_match;
|
||
elf_swap_shdr_in (abfd, &x_shdr, &i_shdr);
|
||
|
||
/* If the section count is zero, the actual count is in the first
|
||
section header. */
|
||
if (i_ehdrp->e_shnum == SHN_UNDEF)
|
||
{
|
||
i_ehdrp->e_shnum = i_shdr.sh_size;
|
||
if (i_ehdrp->e_shnum >= SHN_LORESERVE
|
||
|| i_ehdrp->e_shnum != i_shdr.sh_size
|
||
|| i_ehdrp->e_shnum == 0)
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* And similarly for the string table index. */
|
||
if (i_ehdrp->e_shstrndx == (SHN_XINDEX & 0xffff))
|
||
{
|
||
i_ehdrp->e_shstrndx = i_shdr.sh_link;
|
||
if (i_ehdrp->e_shstrndx != i_shdr.sh_link)
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* And program headers. */
|
||
if (i_ehdrp->e_phnum == PN_XNUM && i_shdr.sh_info != 0)
|
||
{
|
||
i_ehdrp->e_phnum = i_shdr.sh_info;
|
||
if (i_ehdrp->e_phnum != i_shdr.sh_info)
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* Sanity check that we can read all of the section headers.
|
||
It ought to be good enough to just read the last one. */
|
||
if (i_ehdrp->e_shnum != 1)
|
||
{
|
||
/* Check that we don't have a totally silly number of sections. */
|
||
if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr)
|
||
|| i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr))
|
||
goto got_wrong_format_error;
|
||
|
||
where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr);
|
||
if ((bfd_size_type) where <= i_ehdrp->e_shoff)
|
||
goto got_wrong_format_error;
|
||
|
||
if (bfd_seek (abfd, where, SEEK_SET) != 0)
|
||
goto got_no_match;
|
||
if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
|
||
goto got_no_match;
|
||
|
||
/* Back to where we were. */
|
||
where = i_ehdrp->e_shoff + sizeof (x_shdr);
|
||
if (bfd_seek (abfd, where, SEEK_SET) != 0)
|
||
goto got_no_match;
|
||
}
|
||
}
|
||
|
||
/* Allocate space for a copy of the section header table in
|
||
internal form. */
|
||
if (i_ehdrp->e_shnum != 0)
|
||
{
|
||
Elf_Internal_Shdr *shdrp;
|
||
unsigned int num_sec;
|
||
size_t amt;
|
||
|
||
if (_bfd_mul_overflow (i_ehdrp->e_shnum, sizeof (*i_shdrp), &amt))
|
||
goto got_wrong_format_error;
|
||
i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt);
|
||
if (!i_shdrp)
|
||
goto got_no_match;
|
||
num_sec = i_ehdrp->e_shnum;
|
||
elf_numsections (abfd) = num_sec;
|
||
if (_bfd_mul_overflow (num_sec, sizeof (i_shdrp), &amt))
|
||
goto got_wrong_format_error;
|
||
elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt);
|
||
if (!elf_elfsections (abfd))
|
||
goto got_no_match;
|
||
elf_tdata (abfd)->being_created = bfd_zalloc (abfd, num_sec);
|
||
if (!elf_tdata (abfd)->being_created)
|
||
goto got_no_match;
|
||
|
||
memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp));
|
||
for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++)
|
||
elf_elfsections (abfd)[shindex] = shdrp++;
|
||
|
||
/* Read in the rest of the section header table and convert it
|
||
to internal form. */
|
||
for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++)
|
||
{
|
||
if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
|
||
goto got_no_match;
|
||
elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex);
|
||
|
||
/* Sanity check sh_link and sh_info. */
|
||
if (i_shdrp[shindex].sh_link >= num_sec)
|
||
{
|
||
/* PR 10478: Accept Solaris binaries with a sh_link
|
||
field set to SHN_BEFORE or SHN_AFTER. */
|
||
switch (ebd->elf_machine_code)
|
||
{
|
||
case EM_386:
|
||
case EM_IAMCU:
|
||
case EM_X86_64:
|
||
case EM_OLD_SPARCV9:
|
||
case EM_SPARC32PLUS:
|
||
case EM_SPARCV9:
|
||
case EM_SPARC:
|
||
if (i_shdrp[shindex].sh_link == (SHN_LORESERVE & 0xffff) /* SHN_BEFORE */
|
||
|| i_shdrp[shindex].sh_link == ((SHN_LORESERVE + 1) & 0xffff) /* SHN_AFTER */)
|
||
break;
|
||
/* Otherwise fall through. */
|
||
default:
|
||
goto got_wrong_format_error;
|
||
}
|
||
}
|
||
|
||
if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK)
|
||
|| i_shdrp[shindex].sh_type == SHT_RELA
|
||
|| i_shdrp[shindex].sh_type == SHT_REL)
|
||
&& i_shdrp[shindex].sh_info >= num_sec)
|
||
goto got_wrong_format_error;
|
||
|
||
/* If the section is loaded, but not page aligned, clear
|
||
D_PAGED. */
|
||
if (i_shdrp[shindex].sh_size != 0
|
||
&& (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->minpagesize)
|
||
!= 0))
|
||
abfd->flags &= ~D_PAGED;
|
||
}
|
||
|
||
if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)
|
||
|| i_shdrp[i_ehdrp->e_shstrndx].sh_type != SHT_STRTAB)
|
||
{
|
||
/* PR 2257:
|
||
We used to just goto got_wrong_format_error here
|
||
but there are binaries in existance for which this test
|
||
will prevent the binutils from working with them at all.
|
||
So we are kind, and reset the string index value to 0
|
||
so that at least some processing can be done. */
|
||
i_ehdrp->e_shstrndx = SHN_UNDEF;
|
||
abfd->read_only = 1;
|
||
_bfd_error_handler
|
||
(_("warning: %pB has a corrupt string table index - ignoring"),
|
||
abfd);
|
||
}
|
||
}
|
||
else if (i_ehdrp->e_shstrndx != SHN_UNDEF)
|
||
goto got_wrong_format_error;
|
||
|
||
/* 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;
|
||
ufile_ptr filesize;
|
||
size_t amt;
|
||
|
||
/* Check for a corrupt input file with an impossibly large number
|
||
of program headers. */
|
||
filesize = bfd_get_file_size (abfd);
|
||
if (filesize != 0
|
||
&& i_ehdrp->e_phnum > filesize / sizeof (Elf_External_Phdr))
|
||
goto got_wrong_format_error;
|
||
if (_bfd_mul_overflow (i_ehdrp->e_phnum, sizeof (*i_phdr), &amt))
|
||
goto got_wrong_format_error;
|
||
elf_tdata (abfd)->phdr
|
||
= (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
|
||
if (elf_tdata (abfd)->phdr == NULL)
|
||
goto got_no_match;
|
||
if (bfd_seek (abfd, (file_ptr) 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_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr)
|
||
goto got_no_match;
|
||
elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
|
||
/* Too much code in BFD relies on alignment being a power of
|
||
two, as required by the ELF spec. */
|
||
if (i_phdr->p_align != (i_phdr->p_align & -i_phdr->p_align))
|
||
{
|
||
abfd->read_only = 1;
|
||
_bfd_error_handler (_("warning: %pB has a program header "
|
||
"with invalid alignment"), abfd);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff >= sizeof (x_ehdr))
|
||
{
|
||
unsigned int num_sec;
|
||
|
||
/* 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. */
|
||
num_sec = elf_numsections (abfd);
|
||
for (shindex = 1; shindex < num_sec; shindex++)
|
||
if (!bfd_section_from_shdr (abfd, shindex))
|
||
goto got_no_match;
|
||
|
||
/* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */
|
||
if (! _bfd_elf_setup_sections (abfd))
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* Let the backend double check the format and override global
|
||
information. */
|
||
if (ebd->elf_backend_object_p)
|
||
{
|
||
if (! (*ebd->elf_backend_object_p) (abfd))
|
||
goto got_wrong_format_error;
|
||
}
|
||
|
||
/* Remember the entry point specified in the ELF file header. */
|
||
bfd_set_start_address (abfd, i_ehdrp->e_entry);
|
||
|
||
/* 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 _bfd_no_cleanup;
|
||
|
||
got_wrong_format_error:
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
|
||
got_no_match:
|
||
return NULL;
|
||
}
|
||
|
||
/* ELF .o/exec file writing */
|
||
|
||
/* Write out the relocs. */
|
||
|
||
void
|
||
elf_write_relocs (bfd *abfd, asection *sec, void *data)
|
||
{
|
||
const struct elf_backend_data * const bed = get_elf_backend_data (abfd);
|
||
bool *failedp = (bool *) data;
|
||
Elf_Internal_Shdr *rela_hdr;
|
||
bfd_vma addr_offset;
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
size_t extsize;
|
||
bfd_byte *dst_rela;
|
||
unsigned int idx;
|
||
asymbol *last_sym;
|
||
int last_sym_idx;
|
||
size_t amt;
|
||
|
||
/* 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;
|
||
|
||
/* If we have opened an existing file for update, reloc_count may be
|
||
set even though we are not linking. In that case we have nothing
|
||
to do. */
|
||
if (sec->orelocation == NULL)
|
||
return;
|
||
|
||
rela_hdr = elf_section_data (sec)->rela.hdr;
|
||
if (rela_hdr == NULL)
|
||
rela_hdr = elf_section_data (sec)->rel.hdr;
|
||
|
||
rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
|
||
if (_bfd_mul_overflow (sec->reloc_count, rela_hdr->sh_entsize, &amt)
|
||
|| (rela_hdr->contents = bfd_alloc (abfd, amt)) == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
|
||
/* Figure out whether the relocations are RELA or REL relocations. */
|
||
if (rela_hdr->sh_type == SHT_RELA)
|
||
{
|
||
swap_out = elf_swap_reloca_out;
|
||
extsize = sizeof (Elf_External_Rela);
|
||
}
|
||
else if (rela_hdr->sh_type == SHT_REL)
|
||
{
|
||
swap_out = elf_swap_reloc_out;
|
||
extsize = sizeof (Elf_External_Rel);
|
||
}
|
||
else
|
||
/* Every relocation section should be either an SHT_RELA or an
|
||
SHT_REL section. */
|
||
abort ();
|
||
|
||
/* 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. */
|
||
addr_offset = 0;
|
||
if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
addr_offset = sec->vma;
|
||
|
||
/* orelocation has the data, reloc_count has the count... */
|
||
last_sym = 0;
|
||
last_sym_idx = 0;
|
||
dst_rela = rela_hdr->contents;
|
||
|
||
for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize)
|
||
{
|
||
Elf_Internal_Rela src_rela;
|
||
arelent *ptr;
|
||
asymbol *sym;
|
||
int n;
|
||
|
||
ptr = sec->orelocation[idx];
|
||
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;
|
||
}
|
||
|
||
if (ptr->howto == NULL)
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
|
||
src_rela.r_offset = ptr->address + addr_offset;
|
||
src_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
|
||
src_rela.r_addend = ptr->addend;
|
||
(*swap_out) (abfd, &src_rela, dst_rela);
|
||
}
|
||
|
||
if (elf_section_data (sec)->has_secondary_relocs
|
||
&& !bed->write_secondary_relocs (abfd, sec))
|
||
{
|
||
*failedp = true;
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Write out the program headers. */
|
||
|
||
int
|
||
elf_write_out_phdrs (bfd *abfd,
|
||
const Elf_Internal_Phdr *phdr,
|
||
unsigned int count)
|
||
{
|
||
while (count--)
|
||
{
|
||
Elf_External_Phdr extphdr;
|
||
|
||
elf_swap_phdr_out (abfd, phdr, &extphdr);
|
||
if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd)
|
||
!= sizeof (Elf_External_Phdr))
|
||
return -1;
|
||
phdr++;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Write out the section headers and the ELF file header. */
|
||
|
||
bool
|
||
elf_write_shdrs_and_ehdr (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;
|
||
size_t amt;
|
||
|
||
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);
|
||
amt = sizeof (x_ehdr);
|
||
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
|
||
|| bfd_bwrite (&x_ehdr, amt, abfd) != amt)
|
||
return false;
|
||
|
||
/* Some fields in the first section header handle overflow of ehdr
|
||
fields. */
|
||
if (i_ehdrp->e_phnum >= PN_XNUM)
|
||
i_shdrp[0]->sh_info = i_ehdrp->e_phnum;
|
||
if (i_ehdrp->e_shnum >= (SHN_LORESERVE & 0xffff))
|
||
i_shdrp[0]->sh_size = i_ehdrp->e_shnum;
|
||
if (i_ehdrp->e_shstrndx >= (SHN_LORESERVE & 0xffff))
|
||
i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx;
|
||
|
||
/* at this point we've concocted all the ELF sections... */
|
||
if (_bfd_mul_overflow (i_ehdrp->e_shnum, sizeof (*x_shdrp), &amt))
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return false;
|
||
}
|
||
x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt);
|
||
if (!x_shdrp)
|
||
return false;
|
||
|
||
for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++)
|
||
{
|
||
#if DEBUG & 2
|
||
elf_debug_section (count, *i_shdrp);
|
||
#endif
|
||
elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count);
|
||
}
|
||
amt = (bfd_size_type) i_ehdrp->e_shnum * sizeof (*x_shdrp);
|
||
if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
|
||
|| bfd_bwrite (x_shdrp, amt, abfd) != amt)
|
||
return false;
|
||
|
||
/* need to dump the string table too... */
|
||
|
||
return true;
|
||
}
|
||
|
||
bool
|
||
elf_checksum_contents (bfd *abfd,
|
||
void (*process) (const void *, size_t, void *),
|
||
void *arg)
|
||
{
|
||
Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
|
||
Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd);
|
||
Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr;
|
||
unsigned int count, num;
|
||
|
||
{
|
||
Elf_External_Ehdr x_ehdr;
|
||
Elf_Internal_Ehdr i_ehdr;
|
||
|
||
i_ehdr = *i_ehdrp;
|
||
i_ehdr.e_phoff = i_ehdr.e_shoff = 0;
|
||
elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr);
|
||
(*process) (&x_ehdr, sizeof x_ehdr, arg);
|
||
}
|
||
|
||
num = i_ehdrp->e_phnum;
|
||
for (count = 0; count < num; count++)
|
||
{
|
||
Elf_External_Phdr x_phdr;
|
||
elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr);
|
||
(*process) (&x_phdr, sizeof x_phdr, arg);
|
||
}
|
||
|
||
num = elf_numsections (abfd);
|
||
for (count = 0; count < num; count++)
|
||
{
|
||
Elf_Internal_Shdr i_shdr;
|
||
Elf_External_Shdr x_shdr;
|
||
bfd_byte *contents, *free_contents;
|
||
|
||
i_shdr = *i_shdrp[count];
|
||
i_shdr.sh_offset = 0;
|
||
|
||
elf_swap_shdr_out (abfd, &i_shdr, &x_shdr);
|
||
(*process) (&x_shdr, sizeof x_shdr, arg);
|
||
|
||
/* Process the section's contents, if it has some.
|
||
PR ld/12451: Read them in if necessary. */
|
||
if (i_shdr.sh_type == SHT_NOBITS)
|
||
continue;
|
||
free_contents = NULL;
|
||
contents = i_shdr.contents;
|
||
if (contents == NULL)
|
||
{
|
||
asection *sec;
|
||
|
||
sec = bfd_section_from_elf_index (abfd, count);
|
||
if (sec != NULL)
|
||
{
|
||
contents = sec->contents;
|
||
if (contents == NULL)
|
||
{
|
||
/* Force rereading from file. */
|
||
sec->flags &= ~SEC_IN_MEMORY;
|
||
if (!bfd_malloc_and_get_section (abfd, sec, &free_contents))
|
||
continue;
|
||
contents = free_contents;
|
||
}
|
||
}
|
||
}
|
||
if (contents != NULL)
|
||
{
|
||
(*process) (contents, i_shdr.sh_size, arg);
|
||
free (free_contents);
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
long
|
||
elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bool 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 *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
Elf_External_Versym *xver;
|
||
Elf_External_Versym *xverbuf = NULL;
|
||
const struct elf_backend_data *ebd;
|
||
size_t amt;
|
||
|
||
/* 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_dynverdef (abfd) != 0
|
||
&& elf_tdata (abfd)->verdef == NULL)
|
||
|| (elf_dynverref (abfd) != 0
|
||
&& elf_tdata (abfd)->verref == NULL))
|
||
{
|
||
if (!_bfd_elf_slurp_version_tables (abfd, false))
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
ebd = get_elf_backend_data (abfd);
|
||
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
|
||
if (symcount == 0)
|
||
sym = symbase = NULL;
|
||
else
|
||
{
|
||
isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
return -1;
|
||
|
||
if (_bfd_mul_overflow (symcount, sizeof (elf_symbol_type), &amt))
|
||
{
|
||
bfd_set_error (bfd_error_file_too_big);
|
||
goto error_return;
|
||
}
|
||
symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt);
|
||
if (symbase == (elf_symbol_type *) NULL)
|
||
goto error_return;
|
||
|
||
/* Read the raw ELF version symbol information. */
|
||
if (verhdr != NULL
|
||
&& verhdr->sh_size / sizeof (Elf_External_Versym) != symcount)
|
||
{
|
||
_bfd_error_handler
|
||
/* xgettext:c-format */
|
||
(_("%pB: version count (%" PRId64 ")"
|
||
" does not match symbol count (%ld)"),
|
||
abfd,
|
||
(int64_t) (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;
|
||
xverbuf = (Elf_External_Versym *)
|
||
_bfd_malloc_and_read (abfd, verhdr->sh_size, verhdr->sh_size);
|
||
if (xverbuf == NULL && verhdr->sh_size != 0)
|
||
goto error_return;
|
||
}
|
||
|
||
/* Skip first symbol, which is a null dummy. */
|
||
xver = xverbuf;
|
||
if (xver != NULL)
|
||
++xver;
|
||
isymend = isymbuf + symcount;
|
||
for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++)
|
||
{
|
||
memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym));
|
||
|
||
sym->symbol.the_bfd = abfd;
|
||
sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL);
|
||
sym->symbol.value = isym->st_value;
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
{
|
||
sym->symbol.section = bfd_und_section_ptr;
|
||
}
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
{
|
||
sym->symbol.section = bfd_abs_section_ptr;
|
||
}
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
{
|
||
sym->symbol.section = bfd_com_section_ptr;
|
||
if ((abfd->flags & BFD_PLUGIN) != 0)
|
||
{
|
||
asection *xc = bfd_get_section_by_name (abfd, "COMMON");
|
||
|
||
if (xc == NULL)
|
||
{
|
||
flagword flags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
|
||
| SEC_EXCLUDE);
|
||
xc = bfd_make_section_with_flags (abfd, "COMMON", flags);
|
||
if (xc == NULL)
|
||
goto error_return;
|
||
}
|
||
sym->symbol.section = xc;
|
||
}
|
||
/* 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 = isym->st_size;
|
||
}
|
||
else
|
||
{
|
||
sym->symbol.section
|
||
= bfd_section_from_elf_index (abfd, isym->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. Note - there is
|
||
code in elf.c:swap_out_syms that calls
|
||
symbol_section_index() in the elf backend for
|
||
cases like this. */
|
||
sym->symbol.section = bfd_abs_section_ptr;
|
||
}
|
||
}
|
||
|
||
/* If this is a relocatable 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 (isym->st_info))
|
||
{
|
||
case STB_LOCAL:
|
||
sym->symbol.flags |= BSF_LOCAL;
|
||
break;
|
||
case STB_GLOBAL:
|
||
if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON)
|
||
sym->symbol.flags |= BSF_GLOBAL;
|
||
break;
|
||
case STB_WEAK:
|
||
sym->symbol.flags |= BSF_WEAK;
|
||
break;
|
||
case STB_GNU_UNIQUE:
|
||
sym->symbol.flags |= BSF_GNU_UNIQUE;
|
||
break;
|
||
}
|
||
|
||
switch (ELF_ST_TYPE (isym->st_info))
|
||
{
|
||
case STT_SECTION:
|
||
/* Mark the input section symbol as used since it may be
|
||
used for relocation and section group.
|
||
NB: BSF_SECTION_SYM_USED is ignored by linker and may
|
||
be cleared by objcopy for non-relocatable inputs. */
|
||
sym->symbol.flags |= (BSF_SECTION_SYM
|
||
| BSF_DEBUGGING
|
||
| BSF_SECTION_SYM_USED);
|
||
break;
|
||
case STT_FILE:
|
||
sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
|
||
break;
|
||
case STT_FUNC:
|
||
sym->symbol.flags |= BSF_FUNCTION;
|
||
break;
|
||
case STT_COMMON:
|
||
/* FIXME: Do we have to put the size field into the value field
|
||
as we do with symbols in SHN_COMMON sections (see above) ? */
|
||
sym->symbol.flags |= BSF_ELF_COMMON;
|
||
/* Fall through. */
|
||
case STT_OBJECT:
|
||
sym->symbol.flags |= BSF_OBJECT;
|
||
break;
|
||
case STT_TLS:
|
||
sym->symbol.flags |= BSF_THREAD_LOCAL;
|
||
break;
|
||
case STT_RELC:
|
||
sym->symbol.flags |= BSF_RELC;
|
||
break;
|
||
case STT_SRELC:
|
||
sym->symbol.flags |= BSF_SRELC;
|
||
break;
|
||
case STT_GNU_IFUNC:
|
||
sym->symbol.flags |= BSF_GNU_INDIRECT_FUNCTION;
|
||
break;
|
||
}
|
||
|
||
if (dynamic)
|
||
sym->symbol.flags |= BSF_DYNAMIC;
|
||
|
||
if (xver != NULL)
|
||
{
|
||
Elf_Internal_Versym iversym;
|
||
|
||
_bfd_elf_swap_versym_in (abfd, xver, &iversym);
|
||
sym->version = iversym.vs_vers;
|
||
xver++;
|
||
}
|
||
|
||
/* Do some backend-specific processing on this symbol. */
|
||
if (ebd->elf_backend_symbol_processing)
|
||
(*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol);
|
||
}
|
||
}
|
||
|
||
/* Do some backend-specific processing on this symbol table. */
|
||
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 */
|
||
}
|
||
|
||
free (xverbuf);
|
||
if (hdr->contents != (unsigned char *) isymbuf)
|
||
free (isymbuf);
|
||
return symcount;
|
||
|
||
error_return:
|
||
free (xverbuf);
|
||
if (hdr->contents != (unsigned char *) isymbuf)
|
||
free (isymbuf);
|
||
return -1;
|
||
}
|
||
|
||
/* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of
|
||
them. */
|
||
|
||
static bool
|
||
elf_slurp_reloc_table_from_section (bfd *abfd,
|
||
asection *asect,
|
||
Elf_Internal_Shdr *rel_hdr,
|
||
bfd_size_type reloc_count,
|
||
arelent *relents,
|
||
asymbol **symbols,
|
||
bool dynamic)
|
||
{
|
||
const struct elf_backend_data * const ebd = get_elf_backend_data (abfd);
|
||
void *allocated = NULL;
|
||
bfd_byte *native_relocs;
|
||
arelent *relent;
|
||
unsigned int i;
|
||
int entsize;
|
||
unsigned int symcount;
|
||
|
||
if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0)
|
||
return false;
|
||
allocated = _bfd_malloc_and_read (abfd, rel_hdr->sh_size, rel_hdr->sh_size);
|
||
if (allocated == NULL)
|
||
return false;
|
||
|
||
native_relocs = (bfd_byte *) allocated;
|
||
|
||
entsize = rel_hdr->sh_entsize;
|
||
BFD_ASSERT (entsize == sizeof (Elf_External_Rel)
|
||
|| entsize == sizeof (Elf_External_Rela));
|
||
|
||
if (dynamic)
|
||
symcount = bfd_get_dynamic_symcount (abfd);
|
||
else
|
||
symcount = bfd_get_symcount (abfd);
|
||
|
||
for (i = 0, relent = relents;
|
||
i < reloc_count;
|
||
i++, relent++, native_relocs += entsize)
|
||
{
|
||
bool res;
|
||
Elf_Internal_Rela rela;
|
||
|
||
if (entsize == sizeof (Elf_External_Rela))
|
||
elf_swap_reloca_in (abfd, native_relocs, &rela);
|
||
else
|
||
elf_swap_reloc_in (abfd, native_relocs, &rela);
|
||
|
||
/* 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) == STN_UNDEF)
|
||
/* FIXME: This and the error case below mean that we have a
|
||
symbol on relocs that is not elf_symbol_type. */
|
||
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
|
||
else if (ELF_R_SYM (rela.r_info) > symcount)
|
||
{
|
||
_bfd_error_handler
|
||
/* xgettext:c-format */
|
||
(_("%pB(%pA): relocation %d has invalid symbol index %ld"),
|
||
abfd, asect, i, (long) ELF_R_SYM (rela.r_info));
|
||
bfd_set_error (bfd_error_bad_value);
|
||
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
|
||
}
|
||
else
|
||
{
|
||
asymbol **ps;
|
||
|
||
ps = symbols + ELF_R_SYM (rela.r_info) - 1;
|
||
|
||
relent->sym_ptr_ptr = ps;
|
||
}
|
||
|
||
relent->addend = rela.r_addend;
|
||
|
||
if ((entsize == sizeof (Elf_External_Rela)
|
||
&& ebd->elf_info_to_howto != NULL)
|
||
|| ebd->elf_info_to_howto_rel == NULL)
|
||
res = ebd->elf_info_to_howto (abfd, relent, &rela);
|
||
else
|
||
res = ebd->elf_info_to_howto_rel (abfd, relent, &rela);
|
||
|
||
if (! res || relent->howto == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
free (allocated);
|
||
return true;
|
||
|
||
error_return:
|
||
free (allocated);
|
||
return false;
|
||
}
|
||
|
||
/* Read in and swap the external relocs. */
|
||
|
||
bool
|
||
elf_slurp_reloc_table (bfd *abfd,
|
||
asection *asect,
|
||
asymbol **symbols,
|
||
bool dynamic)
|
||
{
|
||
const struct elf_backend_data * const bed = get_elf_backend_data (abfd);
|
||
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;
|
||
size_t amt;
|
||
|
||
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 ? NUM_SHDR_ENTRIES (rel_hdr) : 0;
|
||
rel_hdr2 = d->rela.hdr;
|
||
reloc_count2 = rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0;
|
||
|
||
/* PR 17512: file: 0b4f81b7. */
|
||
if (asect->reloc_count != reloc_count + reloc_count2)
|
||
return false;
|
||
BFD_ASSERT ((rel_hdr && 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->size == 0)
|
||
return true;
|
||
|
||
rel_hdr = &d->this_hdr;
|
||
reloc_count = NUM_SHDR_ENTRIES (rel_hdr);
|
||
rel_hdr2 = NULL;
|
||
reloc_count2 = 0;
|
||
}
|
||
|
||
if (_bfd_mul_overflow (reloc_count + reloc_count2, sizeof (arelent), &amt))
|
||
{
|
||
bfd_set_error (bfd_error_file_too_big);
|
||
return false;
|
||
}
|
||
relents = (arelent *) bfd_alloc (abfd, amt);
|
||
if (relents == NULL)
|
||
return false;
|
||
|
||
if (rel_hdr
|
||
&& !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;
|
||
|
||
if (!bed->slurp_secondary_relocs (abfd, asect, symbols, dynamic))
|
||
return false;
|
||
|
||
asect->relocation = relents;
|
||
return true;
|
||
}
|
||
|
||
#if DEBUG & 2
|
||
static void
|
||
elf_debug_section (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);
|
||
}
|
||
#endif
|
||
|
||
#if DEBUG & 1
|
||
static void
|
||
elf_debug_file (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);
|
||
}
|
||
#endif
|
||
|
||
/* Create a new BFD as if by bfd_openr. Rather than opening a file,
|
||
reconstruct an ELF file by reading the segments out of remote
|
||
memory based on the ELF file header at EHDR_VMA and the ELF program
|
||
headers it points to. If non-zero, SIZE is the known extent of the
|
||
object. If not null, *LOADBASEP is filled in with the difference
|
||
between the VMAs from which the segments were read, and the VMAs
|
||
the file headers (and hence BFD's idea of each section's VMA) put
|
||
them at.
|
||
|
||
The function TARGET_READ_MEMORY is called to copy LEN bytes from
|
||
the remote memory at target address VMA into the local buffer at
|
||
MYADDR; it should return zero on success or an `errno' code on
|
||
failure. TEMPL must be a BFD for a target with the word size and
|
||
byte order found in the remote memory. */
|
||
|
||
bfd *
|
||
NAME(_bfd_elf,bfd_from_remote_memory)
|
||
(bfd *templ,
|
||
bfd_vma ehdr_vma /* Bytes. */,
|
||
bfd_size_type size /* Octets. */,
|
||
bfd_vma *loadbasep /* Bytes. */,
|
||
int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type))
|
||
/* (Bytes , , octets ). */
|
||
{
|
||
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
|
||
Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */
|
||
Elf_External_Phdr *x_phdrs;
|
||
Elf_Internal_Phdr *i_phdrs, *last_phdr, *first_phdr;
|
||
bfd *nbfd;
|
||
struct bfd_in_memory *bim;
|
||
bfd_byte *contents;
|
||
int err;
|
||
unsigned int i;
|
||
bfd_vma high_offset;
|
||
bfd_vma shdr_end;
|
||
bfd_vma loadbase; /* Bytes. */
|
||
size_t amt;
|
||
unsigned int opb = bfd_octets_per_byte (templ, NULL);
|
||
|
||
/* Read in the ELF header in external format. */
|
||
err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr);
|
||
if (err)
|
||
{
|
||
bfd_set_error (bfd_error_system_call);
|
||
errno = err;
|
||
return NULL;
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
if (! elf_file_p (&x_ehdr)
|
||
|| x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
|
||
|| x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
/* 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 (templ))
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
break;
|
||
case ELFDATA2LSB: /* Little-endian */
|
||
if (! bfd_header_little_endian (templ))
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
break;
|
||
case ELFDATANONE: /* No data encoding specified */
|
||
default: /* Unknown data encoding specified */
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr);
|
||
|
||
/* The file header tells where to find the program headers.
|
||
These are what we use to actually choose what to read. */
|
||
|
||
if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0)
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
if (_bfd_mul_overflow (i_ehdr.e_phnum,
|
||
sizeof (*x_phdrs) + sizeof (*i_phdrs), &amt))
|
||
{
|
||
bfd_set_error (bfd_error_file_too_big);
|
||
return NULL;
|
||
}
|
||
x_phdrs = (Elf_External_Phdr *) bfd_malloc (amt);
|
||
if (x_phdrs == NULL)
|
||
return NULL;
|
||
err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs,
|
||
i_ehdr.e_phnum * sizeof x_phdrs[0]);
|
||
if (err)
|
||
{
|
||
free (x_phdrs);
|
||
bfd_set_error (bfd_error_system_call);
|
||
errno = err;
|
||
return NULL;
|
||
}
|
||
i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum];
|
||
|
||
high_offset = 0;
|
||
loadbase = 0;
|
||
first_phdr = NULL;
|
||
last_phdr = NULL;
|
||
for (i = 0; i < i_ehdr.e_phnum; ++i)
|
||
{
|
||
elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]);
|
||
if (i_phdrs[i].p_type == PT_LOAD)
|
||
{
|
||
bfd_vma segment_end = i_phdrs[i].p_offset + i_phdrs[i].p_filesz;
|
||
|
||
if (segment_end > high_offset)
|
||
{
|
||
high_offset = segment_end;
|
||
last_phdr = &i_phdrs[i];
|
||
}
|
||
|
||
/* If this program header covers offset zero, where the file
|
||
header sits, then we can figure out the loadbase. */
|
||
if (first_phdr == NULL)
|
||
{
|
||
bfd_vma p_offset = i_phdrs[i].p_offset; /* Octets. */
|
||
bfd_vma p_vaddr = i_phdrs[i].p_vaddr; /* Octets. */
|
||
|
||
if (i_phdrs[i].p_align > 1)
|
||
{
|
||
p_offset &= -(i_phdrs[i].p_align * opb);
|
||
p_vaddr &= -(i_phdrs[i].p_align * opb);
|
||
}
|
||
if (p_offset == 0)
|
||
{
|
||
loadbase = ehdr_vma - p_vaddr / opb;
|
||
first_phdr = &i_phdrs[i];
|
||
}
|
||
}
|
||
}
|
||
}
|
||
if (high_offset == 0)
|
||
{
|
||
/* There were no PT_LOAD segments, so we don't have anything to read. */
|
||
free (x_phdrs);
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return NULL;
|
||
}
|
||
|
||
shdr_end = 0;
|
||
if (i_ehdr.e_shoff != 0 && i_ehdr.e_shnum != 0 && i_ehdr.e_shentsize != 0)
|
||
{
|
||
shdr_end = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize;
|
||
|
||
if (last_phdr->p_filesz != last_phdr->p_memsz)
|
||
{
|
||
/* If the last PT_LOAD header has a bss area then ld.so will
|
||
have cleared anything past p_filesz, zapping the section
|
||
headers. */
|
||
}
|
||
else if (size >= shdr_end)
|
||
high_offset = size;
|
||
else
|
||
{
|
||
bfd_vma page_size = get_elf_backend_data (templ)->minpagesize;
|
||
bfd_vma segment_end = last_phdr->p_offset + last_phdr->p_filesz;
|
||
|
||
/* Assume we loaded full pages, allowing us to sometimes see
|
||
section headers. */
|
||
if (page_size > 1 && shdr_end > segment_end)
|
||
{
|
||
bfd_vma page_end = (segment_end + page_size - 1) & -page_size;
|
||
|
||
if (page_end >= shdr_end)
|
||
/* Whee, section headers covered. */
|
||
high_offset = shdr_end;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Now we know the size of the whole image we want read in. */
|
||
contents = (bfd_byte *) bfd_zmalloc (high_offset);
|
||
if (contents == NULL)
|
||
{
|
||
free (x_phdrs);
|
||
return NULL;
|
||
}
|
||
|
||
for (i = 0; i < i_ehdr.e_phnum; ++i)
|
||
if (i_phdrs[i].p_type == PT_LOAD)
|
||
{
|
||
bfd_vma start = i_phdrs[i].p_offset; /* Octets. */
|
||
bfd_vma end = start + i_phdrs[i].p_filesz; /* Octets. */
|
||
bfd_vma vaddr = i_phdrs[i].p_vaddr; /* Octets. */
|
||
|
||
/* Extend the beginning of the first pt_load to cover file
|
||
header and program headers, if we proved earlier that its
|
||
aligned offset is 0. */
|
||
if (first_phdr == &i_phdrs[i])
|
||
{
|
||
vaddr -= start;
|
||
start = 0;
|
||
}
|
||
/* Extend the end of the last pt_load to cover section headers. */
|
||
if (last_phdr == &i_phdrs[i])
|
||
end = high_offset;
|
||
err = target_read_memory (loadbase + vaddr / opb,
|
||
contents + start, end - start);
|
||
if (err)
|
||
{
|
||
free (x_phdrs);
|
||
free (contents);
|
||
bfd_set_error (bfd_error_system_call);
|
||
errno = err;
|
||
return NULL;
|
||
}
|
||
}
|
||
free (x_phdrs);
|
||
|
||
/* If the segments visible in memory didn't include the section headers,
|
||
then clear them from the file header. */
|
||
if (high_offset < shdr_end)
|
||
{
|
||
memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff);
|
||
memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum);
|
||
memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx);
|
||
}
|
||
|
||
/* This will normally have been in the first PT_LOAD segment. But it
|
||
conceivably could be missing, and we might have just changed it. */
|
||
memcpy (contents, &x_ehdr, sizeof x_ehdr);
|
||
|
||
/* Now we have a memory image of the ELF file contents. Make a BFD. */
|
||
bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory));
|
||
if (bim == NULL)
|
||
{
|
||
free (contents);
|
||
return NULL;
|
||
}
|
||
nbfd = _bfd_new_bfd ();
|
||
if (nbfd == NULL
|
||
|| !bfd_set_filename (nbfd, "<in-memory>"))
|
||
{
|
||
free (bim);
|
||
free (contents);
|
||
return NULL;
|
||
}
|
||
nbfd->xvec = templ->xvec;
|
||
bim->size = high_offset;
|
||
bim->buffer = contents;
|
||
nbfd->iostream = bim;
|
||
nbfd->flags = BFD_IN_MEMORY;
|
||
nbfd->iovec = &_bfd_memory_iovec;
|
||
nbfd->origin = 0;
|
||
nbfd->direction = read_direction;
|
||
nbfd->mtime = time (NULL);
|
||
nbfd->mtime_set = true;
|
||
|
||
if (loadbasep)
|
||
*loadbasep = loadbase;
|
||
return nbfd;
|
||
}
|
||
|
||
/* Function for ELF_R_INFO. */
|
||
|
||
bfd_vma
|
||
NAME(elf,r_info) (bfd_vma sym, bfd_vma type)
|
||
{
|
||
return ELF_R_INFO (sym, type);
|
||
}
|
||
|
||
/* Function for ELF_R_SYM. */
|
||
|
||
bfd_vma
|
||
NAME(elf,r_sym) (bfd_vma r_info)
|
||
{
|
||
return ELF_R_SYM (r_info);
|
||
}
|
||
|
||
#include "elfcore.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, LOG_FILE_ALIGN,
|
||
ELFCLASS, EV_CURRENT,
|
||
elf_write_out_phdrs,
|
||
elf_write_shdrs_and_ehdr,
|
||
elf_checksum_contents,
|
||
elf_write_relocs,
|
||
elf_swap_symbol_in,
|
||
elf_swap_symbol_out,
|
||
elf_slurp_reloc_table,
|
||
elf_slurp_symbol_table,
|
||
elf_swap_dyn_in,
|
||
elf_swap_dyn_out,
|
||
elf_swap_reloc_in,
|
||
elf_swap_reloc_out,
|
||
elf_swap_reloca_in,
|
||
elf_swap_reloca_out
|
||
};
|