newlib/include/elf/external.h

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/* ELF support for BFD.
Copyright 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2001, 2003, 2005
Free Software Foundation, Inc.
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Written by Fred Fish @ Cygnus Support, from information published
in "UNIX System V Release 4, Programmers Guide: ANSI C and
Programming Support Tools".
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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/* This file is part of ELF support for BFD, and contains the portions
that describe how ELF is represented externally by the BFD library.
I.E. it describes the in-file representation of ELF. It requires
the elf/common.h file which contains the portions that are common to
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both the internal and external representations. */
/* The 64-bit stuff is kind of random. Perhaps someone will publish a
spec someday. */
#ifndef _ELF_EXTERNAL_H
#define _ELF_EXTERNAL_H
/* ELF Header (32-bit implementations) */
typedef struct {
unsigned char e_ident[16]; /* ELF "magic number" */
unsigned char e_type[2]; /* Identifies object file type */
unsigned char e_machine[2]; /* Specifies required architecture */
unsigned char e_version[4]; /* Identifies object file version */
unsigned char e_entry[4]; /* Entry point virtual address */
unsigned char e_phoff[4]; /* Program header table file offset */
unsigned char e_shoff[4]; /* Section header table file offset */
unsigned char e_flags[4]; /* Processor-specific flags */
unsigned char e_ehsize[2]; /* ELF header size in bytes */
unsigned char e_phentsize[2]; /* Program header table entry size */
unsigned char e_phnum[2]; /* Program header table entry count */
unsigned char e_shentsize[2]; /* Section header table entry size */
unsigned char e_shnum[2]; /* Section header table entry count */
unsigned char e_shstrndx[2]; /* Section header string table index */
} Elf32_External_Ehdr;
typedef struct {
unsigned char e_ident[16]; /* ELF "magic number" */
unsigned char e_type[2]; /* Identifies object file type */
unsigned char e_machine[2]; /* Specifies required architecture */
unsigned char e_version[4]; /* Identifies object file version */
unsigned char e_entry[8]; /* Entry point virtual address */
unsigned char e_phoff[8]; /* Program header table file offset */
unsigned char e_shoff[8]; /* Section header table file offset */
unsigned char e_flags[4]; /* Processor-specific flags */
unsigned char e_ehsize[2]; /* ELF header size in bytes */
unsigned char e_phentsize[2]; /* Program header table entry size */
unsigned char e_phnum[2]; /* Program header table entry count */
unsigned char e_shentsize[2]; /* Section header table entry size */
unsigned char e_shnum[2]; /* Section header table entry count */
unsigned char e_shstrndx[2]; /* Section header string table index */
} Elf64_External_Ehdr;
/* Program header */
typedef struct {
unsigned char p_type[4]; /* Identifies program segment type */
unsigned char p_offset[4]; /* Segment file offset */
unsigned char p_vaddr[4]; /* Segment virtual address */
unsigned char p_paddr[4]; /* Segment physical address */
unsigned char p_filesz[4]; /* Segment size in file */
unsigned char p_memsz[4]; /* Segment size in memory */
unsigned char p_flags[4]; /* Segment flags */
unsigned char p_align[4]; /* Segment alignment, file & memory */
} Elf32_External_Phdr;
typedef struct {
unsigned char p_type[4]; /* Identifies program segment type */
unsigned char p_flags[4]; /* Segment flags */
unsigned char p_offset[8]; /* Segment file offset */
unsigned char p_vaddr[8]; /* Segment virtual address */
unsigned char p_paddr[8]; /* Segment physical address */
unsigned char p_filesz[8]; /* Segment size in file */
unsigned char p_memsz[8]; /* Segment size in memory */
unsigned char p_align[8]; /* Segment alignment, file & memory */
} Elf64_External_Phdr;
/* Section header */
typedef struct {
unsigned char sh_name[4]; /* Section name, index in string tbl */
unsigned char sh_type[4]; /* Type of section */
unsigned char sh_flags[4]; /* Miscellaneous section attributes */
unsigned char sh_addr[4]; /* Section virtual addr at execution */
unsigned char sh_offset[4]; /* Section file offset */
unsigned char sh_size[4]; /* Size of section in bytes */
unsigned char sh_link[4]; /* Index of another section */
unsigned char sh_info[4]; /* Additional section information */
unsigned char sh_addralign[4]; /* Section alignment */
unsigned char sh_entsize[4]; /* Entry size if section holds table */
} Elf32_External_Shdr;
typedef struct {
unsigned char sh_name[4]; /* Section name, index in string tbl */
unsigned char sh_type[4]; /* Type of section */
unsigned char sh_flags[8]; /* Miscellaneous section attributes */
unsigned char sh_addr[8]; /* Section virtual addr at execution */
unsigned char sh_offset[8]; /* Section file offset */
unsigned char sh_size[8]; /* Size of section in bytes */
unsigned char sh_link[4]; /* Index of another section */
unsigned char sh_info[4]; /* Additional section information */
unsigned char sh_addralign[8]; /* Section alignment */
unsigned char sh_entsize[8]; /* Entry size if section holds table */
} Elf64_External_Shdr;
/* Symbol table entry */
typedef struct {
unsigned char st_name[4]; /* Symbol name, index in string tbl */
unsigned char st_value[4]; /* Value of the symbol */
unsigned char st_size[4]; /* Associated symbol size */
unsigned char st_info[1]; /* Type and binding attributes */
unsigned char st_other[1]; /* No defined meaning, 0 */
unsigned char st_shndx[2]; /* Associated section index */
} Elf32_External_Sym;
typedef struct {
unsigned char st_name[4]; /* Symbol name, index in string tbl */
unsigned char st_info[1]; /* Type and binding attributes */
unsigned char st_other[1]; /* No defined meaning, 0 */
unsigned char st_shndx[2]; /* Associated section index */
unsigned char st_value[8]; /* Value of the symbol */
unsigned char st_size[8]; /* Associated symbol size */
} Elf64_External_Sym;
Support for more than 64k ELF sections. include/elf/ChangeLog * external.h (Elf_External_Sym_Shndx): Declare. * internal.h (struct elf_internal_sym <st_shndx>): Make it an unsigned int. * common.h (SHN_BAD): Define. bfd/ChangeLog * configure.in: Bump bfd version. * configure: Regenerate. * elf-bfd.h (elf_size_info <swap_symbol_out>): Add shndx param. (bfd_elf32_swap_symbol_in): Likewise. (bfd_elf32_swap_symbol_out): Likewise. (bfd_elf64_swap_symbol_in): Likewise. (bfd_elf64_swap_symbol_out): Likewise. (elf_reloc_cookie): Add locsym_shndx field. Make locsyms a PTR. (elf_obj_tdata): Add num_elf_sections, symtab_shndx_hdr and symtab_shndx_section. (elf_numsections): Define. (elf_symtab_shndx): Define. * elf.c (setup_group): Use elf_numsections rather than header e_shnum. (bfd_elf_find_section): Likewise. (bfd_section_from_elf_index): Likewise. (bfd_section_from_shdr): Likewise. Handle SHT_SYMTAB_SHNDX. (bfd_section_from_r_symndx): Read symbol shndx extension, and translate st_shndx for > SHN_HIRESERVE. (assign_section_numbers): Skip reserved sections. Assign symtab_shndx_section and elf_numsections. Exclude reserved sections from e_shnum. Set up symtab_shndx_hdr. (_bfd_elf_compute_section_file_positions): Handle symtab_shndx_hdr. (map_sections_to_segments): Don't map eh_frame_hdr unless required. (assign_file_positions_except_relocs): Use elf_numsections rather than header e_shnum. Skip reserved sections and symtab_shndx_section. (prep_headers): Set name for symtab_shndx_hdr. (_bfd_elf_assign_file_positions_for_relocs): Use elf_numsections. (_bfd_elf_write_object_contents): Likewise. Skip reserved sections. (_bfd_elf_section_from_bfd_section): Check bfd_{abs,com,und}_section first. Use elf_section_data if available. Use elf_numsections. Start scan at index 1. (copy_private_bfd_data ): Comment fixes. (MAP_ONESYMTAB): Define above SHN_HIOS. (MAP_DYNSYMTAB): Likewise. (MAP_STRTAB): Likewise. (MAP_SHSTRTAB): Likewise. (MAP_SYM_SHNDX): New define. (_bfd_elf_copy_private_symbol_data): Handle symtab_shndx_section. (swap_out_syms): Swap out SHT_SYMTAB_SHNDX section too. * elfcode.h (elf_swap_symbol_in): Add shndx param, and handle shndx extension. (elf_swap_symbol_out): Likewise. (elf_object_p): Set elf_numsections, and use instead of e_shnum. Initialialise reserved elf_elfsections to point at shdr[0]. Remove redundant bfd_release calls. (elf_slurp_symbol_table): Read symbol shndx extension, and use with elf_swap_symbol_in. Translate st_shndx for > SHN_HIRESERVE too. * elflink.h (elf_link_is_defined_archive_symbol): Read symbol shndx extension, and use with elf_swap_symbol_in. (elf_link_record_local_dynamic_symbol): Likewise. (elf_link_add_object_symbols): Likewise. Also translate st_shndx for elf sections > SHN_HIRESERVE. (NAME(bfd_elf,size_dynamic_sections)): Adjust elf_swap_symbol_out call. (struct elf_final_link_info): Add locsym_shndx and symshndxbuf. (elf_bfd_final_link): Allocate the above, and tidy code allocating other buffers. Use elf_numsections instead of e_shnum. Adjust elf_swap_symbol_out calls. (elf_link_output_sym): Swap out symbol shndx extension too. (elf_link_flush_output_syms): And flush them to disk. (elf_link_output_extsym): Use SHN_BAD. Adjust elf_swap_symbol_out calls. (elf_gc_mark): Read symbol shndx extension, and use with elf_swap_symbol_in. (elf_link_input_bfd): Likewise, Translate st_shndx for elf sections > SHN_HIRESERVE too. Use SHN_BAD. (elf_reloc_symbol_deleted_p): Use symbol shndx extensions with elf_swap_symbol_in. Translate st_shndx > SHN_HIRESERVE too. (elf_bfd_discard_info): Read symbol shndx extension. Don't attempt to continue after a bfd error. * elf-m10200.c (mn10200_elf_relax_section): Only read local syms. Stash them immediately to symtab_hdr->contents rather than later in multiple places. Clean up afterwards. Read symbol shndx extension, and use with swap_symbol_in. Translate SHN_UNDEF, SHN_ABS, SHN_COMMON and elf sections > SHN_HIRESERVE to bfd sections too. Remove dead code. (mn10200_elf_relax_delete_bytes): Use symbol shndx extension when swapping in symbols. Tidy code adjusting global syms. Don't swap in global syms. (mn10200_elf_symbol_address_p): Likewise. Remove extsyms param. (mn10200_elf_get_relocated_section_contents): Read symbol shndx extension, and use with swap_symbol_in. Rename "size" -> "amt" to maximize code in common with other files. Translate st_shndx for > SHN_HIRESERVE too. Remove dead code. * elf-m10300.c (mn10300_elf_relax_section): Only read local syms. Stash them immediately to symtab_hdr->contents rather than later in multiple places. Clean up afterwards. Read symbol shndx extension, and use with swap_symbol_in. Remove dead code. (mn10300_elf_relax_delete_bytes): As for elf-m10200.c. (mn10300_elf_symbol_address_p): Likewise. (mn10300_elf_get_relocated_section_contents): Likewise. * elf32-h8300.c (elf32_h8_relax_section): As for elf-m10300.c. (elf32_h8_relax_delete_bytes): Likewise. (elf32_h8_symbol_address_p): Likewise. (elf32_h8_get_relocated_section_contents): Likewise. * elf32-hppa.c (elf32_hppa_size_stubs): Read symbol shndx extension, and use with swap_symbol_in. * elf64-hppa.c (elf64_hppa_check_relocs): Likewise. * elf32-i370.c (i370_elf_finish_dynamic_sections): Adjust call to bfd_elf32_swap_symbol_out. * elf32-m32r.c (m32r_elf_get_relocated_section_contents): Translate elf sections > SHN_HIRESERVE too. * elf32-m68k.c (bfd_m68k_elf32_create_embedded_relocs): Only read local syms. Read symbol shndx extension, and use with swap_symbol_in. * elf32-mips.c (_bfd_mips_elf_final_write_processing): Use elf_numsections rather than header e_shnum. * elf32-sh.c (sh_elf_relax_section): As for elf-m10300.c. (sh_elf_relax_delete_bytes): Likewise. (sh_elf_get_relocated_section_contents): Likewise. Only read local symbols. * elf32-v850.c (v850_elf_symbol_processing): Use an unsigned int to hold section index. Use elf_numsections rather than e_shnum. Rename "index" -> "indx" to avoid shadowing warning. (v850_elf_add_symbol_hook): Likewise. * elf64-alpha.c (elf64_alpha_relax_section): Only read local syms. Read symbol shndx extension, and use with swap_symbol_in. * elf32-xstormy16.c (xstormy16_elf_relax_section): Likewise. Translate SHN_COMMON and elf sections > SHN_HIRESERVE too. * elfxx-ia64.c (elfNN_ia64_relax_section): Likewise. (elfNN_ia64_aix_add_symbol_hook): Use elf_numsections. * elf-m10300.c (mn10300_elf_gc_mark_hook): Remove unnecessary checks before calling bfd_section_from_elf_index on local syms. * elf32-arm.h (elf32_arm_gc_mark_hook): Likewise. * elf32-avr.c (elf32_avr_gc_mark_hook): Likewise. * elf32-cris.c (cris_elf_gc_mark_hook): Likewise. * elf32-d10v.c (elf32_d10v_gc_mark_hook): Likewise. * elf32-fr30.c (fr30_elf_gc_mark_hook): Likewise. * elf32-hppa.c (elf32_hppa_gc_mark_hook): Likewise. * elf32-i386.c (elf_i386_gc_mark_hook): Likewise. * elf32-m32r.c (m32r_elf_gc_mark_hook): Likewise. * elf32-m68k.c (elf_m68k_gc_mark_hook): Likewise. * elf32-mcore.c (mcore_elf_gc_mark_hook): Likewise. * elf32-mips.c (_bfd_mips_elf_gc_mark_hook): Likewise. * elf32-openrisc.c (openrisc_elf_gc_mark_hook): Likewise. * elf32-ppc.c (ppc_elf_gc_mark_hook): Likewise. * elf32-s390.c (elf_s390_gc_mark_hook): Likewise. * elf32-sh.c (sh_elf_gc_mark_hook): Likewise. * elf32-sparc.c (elf32_sparc_gc_mark_hook): Likewise. * elf32-v850.c (v850_elf_gc_mark_hook): Likewise. * elf32-xstormy16.c (xstormy16_elf_gc_mark_hook): Likewise. * elf64-mips.c (mips_elf64_gc_mark_hook): Likewise. * elf64-mmix.c (mmix_elf_gc_mark_hook): Likewise. * elf64-ppc.c (ppc64_elf_gc_mark_hook): Likewise. * elf64-s390.c (elf_s390_gc_mark_hook): Likewise. * elf64-x86-64.c (elf64_x86_64_gc_mark_hook): Likewise. binutils/ChangeLog * readelf.c (symtab_shndx_hdr): New global. (SECTION_HEADER_INDEX): Define. (SECTION_HEADER_NUM): Define. (SECTION_HEADER): Define. (GET_ELF_SYMBOLS): Pass two params rather than three. (get_32bit_elf_symbols): Take file and section args. Read and use SHT_SYMTAB_SHNDX. (get_64bit_elf_symbols): Likewise. (dump_relocations): Use SECTION_HEADER to index "section_headers". (process_section_headers): Likewise. Use SECTION_HEADER_NUM too. Remember symtab_shdx_hdr. (process_program_headers): Scan from index 1 for segment map. (slurp_ia64_unwind_table): Use SECTION_HEADER to index "section_headers". (process_relocs): Likewise. Also adjust call to GET_ELF_SYMBOLS. (process_unwind): Likewise. (process_version_sections): Likewise. (process_symbol_table): Likewise. (display_debug_info): Likewise. (process_dynamic_segment): Fake up a symtab section for changed GET_ELF_SYMBOLS. (get_symbol_index_type): Check SHN_LOOS before SHN_LORESERVE. (process_program_headers): Kill signed/unsigned warning. (load_debug_str): Likewise. (display_debug_info): Likewise.
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typedef struct {
unsigned char est_shndx[4]; /* Section index */
} Elf_External_Sym_Shndx;
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/* Note segments */
typedef struct {
unsigned char namesz[4]; /* Size of entry's owner string */
unsigned char descsz[4]; /* Size of the note descriptor */
unsigned char type[4]; /* Interpretation of the descriptor */
char name[1]; /* Start of the name+desc data */
} Elf_External_Note;
/* Relocation Entries */
typedef struct {
unsigned char r_offset[4]; /* Location at which to apply the action */
unsigned char r_info[4]; /* index and type of relocation */
} Elf32_External_Rel;
typedef struct {
unsigned char r_offset[4]; /* Location at which to apply the action */
unsigned char r_info[4]; /* index and type of relocation */
unsigned char r_addend[4]; /* Constant addend used to compute value */
} Elf32_External_Rela;
typedef struct {
unsigned char r_offset[8]; /* Location at which to apply the action */
unsigned char r_info[8]; /* index and type of relocation */
} Elf64_External_Rel;
typedef struct {
unsigned char r_offset[8]; /* Location at which to apply the action */
unsigned char r_info[8]; /* index and type of relocation */
unsigned char r_addend[8]; /* Constant addend used to compute value */
} Elf64_External_Rela;
/* dynamic section structure */
typedef struct {
unsigned char d_tag[4]; /* entry tag value */
union {
unsigned char d_val[4];
unsigned char d_ptr[4];
} d_un;
} Elf32_External_Dyn;
typedef struct {
unsigned char d_tag[8]; /* entry tag value */
union {
unsigned char d_val[8];
unsigned char d_ptr[8];
} d_un;
} Elf64_External_Dyn;
/* The version structures are currently size independent. They are
named without a 32 or 64. If that ever changes, these structures
will need to be renamed. */
/* This structure appears in a SHT_GNU_verdef section. */
typedef struct {
unsigned char vd_version[2];
unsigned char vd_flags[2];
unsigned char vd_ndx[2];
unsigned char vd_cnt[2];
unsigned char vd_hash[4];
unsigned char vd_aux[4];
unsigned char vd_next[4];
} Elf_External_Verdef;
/* This structure appears in a SHT_GNU_verdef section. */
typedef struct {
unsigned char vda_name[4];
unsigned char vda_next[4];
} Elf_External_Verdaux;
/* This structure appears in a SHT_GNU_verneed section. */
typedef struct {
unsigned char vn_version[2];
unsigned char vn_cnt[2];
unsigned char vn_file[4];
unsigned char vn_aux[4];
unsigned char vn_next[4];
} Elf_External_Verneed;
/* This structure appears in a SHT_GNU_verneed section. */
typedef struct {
unsigned char vna_hash[4];
unsigned char vna_flags[2];
unsigned char vna_other[2];
unsigned char vna_name[4];
unsigned char vna_next[4];
} Elf_External_Vernaux;
/* This structure appears in a SHT_GNU_versym section. This is not a
standard ELF structure; ELF just uses Elf32_Half. */
typedef struct {
unsigned char vs_vers[2];
} ATTRIBUTE_PACKED Elf_External_Versym;
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/* Structure for syminfo section. */
typedef struct
{
unsigned char si_boundto[2];
unsigned char si_flags[2];
} Elf_External_Syminfo;
/* This structure appears on the stack and in NT_AUXV core file notes. */
typedef struct
{
unsigned char a_type[4];
unsigned char a_val[4];
} Elf32_External_Auxv;
typedef struct
{
unsigned char a_type[8];
unsigned char a_val[8];
} Elf64_External_Auxv;
/* Size of SHT_GROUP section entry. */
#define GRP_ENTRY_SIZE 4
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#endif /* _ELF_EXTERNAL_H */