diff options
Diffstat (limited to 'binutils-2.25/include/elf/internal.h')
| -rw-r--r-- | binutils-2.25/include/elf/internal.h | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/binutils-2.25/include/elf/internal.h b/binutils-2.25/include/elf/internal.h new file mode 100644 index 00000000..46150378 --- /dev/null +++ b/binutils-2.25/include/elf/internal.h @@ -0,0 +1,360 @@ +/* ELF support for BFD. + Copyright 1991, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2001, 2002, + 2003, 2006, 2007, 2008, 2010, 2011 Free Software Foundation, Inc. + + 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 3 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. */ + +/* This file is part of ELF support for BFD, and contains the portions + that describe how ELF is represented internally in the BFD library. + I.E. it describes the in-memory representation of ELF. It requires + the elf-common.h file which contains the portions that are common to + both the internal and external representations. */ + +/* NOTE that these structures are not kept in the same order as they appear + in the object file. In some cases they've been reordered for more optimal + packing under various circumstances. */ + +#ifndef _ELF_INTERNAL_H +#define _ELF_INTERNAL_H + +/* Special section indices, which may show up in st_shndx fields, among + other places. */ + +#undef SHN_UNDEF +#undef SHN_LORESERVE +#undef SHN_LOPROC +#undef SHN_HIPROC +#undef SHN_LOOS +#undef SHN_HIOS +#undef SHN_ABS +#undef SHN_COMMON +#undef SHN_XINDEX +#undef SHN_HIRESERVE +#define SHN_UNDEF 0 /* Undefined section reference */ +#define SHN_LORESERVE (-0x100u) /* Begin range of reserved indices */ +#define SHN_LOPROC (-0x100u) /* Begin range of appl-specific */ +#define SHN_HIPROC (-0xE1u) /* End range of appl-specific */ +#define SHN_LOOS (-0xE0u) /* OS specific semantics, lo */ +#define SHN_HIOS (-0xC1u) /* OS specific semantics, hi */ +#define SHN_ABS (-0xFu) /* Associated symbol is absolute */ +#define SHN_COMMON (-0xEu) /* Associated symbol is in common */ +#define SHN_XINDEX (-0x1u) /* Section index is held elsewhere */ +#define SHN_HIRESERVE (-0x1u) /* End range of reserved indices */ +#define SHN_BAD (-0x101u) /* Used internally by bfd */ + +/* ELF Header */ + +#define EI_NIDENT 16 /* Size of e_ident[] */ + +typedef struct elf_internal_ehdr { + unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ + bfd_vma e_entry; /* Entry point virtual address */ + bfd_size_type e_phoff; /* Program header table file offset */ + bfd_size_type e_shoff; /* Section header table file offset */ + unsigned long e_version; /* Identifies object file version */ + unsigned long e_flags; /* Processor-specific flags */ + unsigned short e_type; /* Identifies object file type */ + unsigned short e_machine; /* Specifies required architecture */ + unsigned int e_ehsize; /* ELF header size in bytes */ + unsigned int e_phentsize; /* Program header table entry size */ + unsigned int e_phnum; /* Program header table entry count */ + unsigned int e_shentsize; /* Section header table entry size */ + unsigned int e_shnum; /* Section header table entry count */ + unsigned int e_shstrndx; /* Section header string table index */ +} Elf_Internal_Ehdr; + +/* Program header */ + +struct elf_internal_phdr { + unsigned long p_type; /* Identifies program segment type */ + unsigned long p_flags; /* Segment flags */ + bfd_vma p_offset; /* Segment file offset */ + bfd_vma p_vaddr; /* Segment virtual address */ + bfd_vma p_paddr; /* Segment physical address */ + bfd_vma p_filesz; /* Segment size in file */ + bfd_vma p_memsz; /* Segment size in memory */ + bfd_vma p_align; /* Segment alignment, file & memory */ +}; + +typedef struct elf_internal_phdr Elf_Internal_Phdr; + +/* Section header */ + +typedef struct elf_internal_shdr { + unsigned int sh_name; /* Section name, index in string tbl */ + unsigned int sh_type; /* Type of section */ + bfd_vma sh_flags; /* Miscellaneous section attributes */ + bfd_vma sh_addr; /* Section virtual addr at execution */ + file_ptr sh_offset; /* Section file offset */ + bfd_size_type sh_size; /* Size of section in bytes */ + unsigned int sh_link; /* Index of another section */ + unsigned int sh_info; /* Additional section information */ + bfd_vma sh_addralign; /* Section alignment */ + bfd_size_type sh_entsize; /* Entry size if section holds table */ + + /* The internal rep also has some cached info associated with it. */ + asection * bfd_section; /* Associated BFD section. */ + unsigned char *contents; /* Section contents. */ +} Elf_Internal_Shdr; + +/* Symbol table entry */ + +struct elf_internal_sym { + bfd_vma st_value; /* Value of the symbol */ + bfd_vma st_size; /* Associated symbol size */ + unsigned long st_name; /* Symbol name, index in string tbl */ + unsigned char st_info; /* Type and binding attributes */ + unsigned char st_other; /* Visibilty, and target specific */ + unsigned char st_target_internal; /* Internal-only information */ + unsigned int st_shndx; /* Associated section index */ +}; + +typedef struct elf_internal_sym Elf_Internal_Sym; + +/* Note segments */ + +typedef struct elf_internal_note { + unsigned long namesz; /* Size of entry's owner string */ + unsigned long descsz; /* Size of the note descriptor */ + unsigned long type; /* Interpretation of the descriptor */ + char * namedata; /* Start of the name+desc data */ + char * descdata; /* Start of the desc data */ + bfd_vma descpos; /* File offset of the descdata */ +} Elf_Internal_Note; + +/* Relocation Entries */ + +typedef struct elf_internal_rela { + bfd_vma r_offset; /* Location at which to apply the action */ + bfd_vma r_info; /* Index and Type of relocation */ + bfd_vma r_addend; /* Constant addend used to compute value */ +} Elf_Internal_Rela; + +/* dynamic section structure */ + +typedef struct elf_internal_dyn { + /* This needs to support 64-bit values in elf64. */ + bfd_vma d_tag; /* entry tag value */ + union { + /* This needs to support 64-bit values in elf64. */ + bfd_vma d_val; + bfd_vma d_ptr; + } d_un; +} Elf_Internal_Dyn; + +/* This structure appears in a SHT_GNU_verdef section. */ + +typedef struct elf_internal_verdef { + unsigned short vd_version; /* Version number of structure. */ + unsigned short vd_flags; /* Flags (VER_FLG_*). */ + unsigned short vd_ndx; /* Version index. */ + unsigned short vd_cnt; /* Number of verdaux entries. */ + unsigned long vd_hash; /* Hash of name. */ + unsigned long vd_aux; /* Offset to verdaux entries. */ + unsigned long vd_next; /* Offset to next verdef. */ + + /* These fields are set up when BFD reads in the structure. FIXME: + It would be cleaner to store these in a different structure. */ + bfd *vd_bfd; /* BFD. */ + const char *vd_nodename; /* Version name. */ + struct elf_internal_verdef *vd_nextdef; /* vd_next as pointer. */ + struct elf_internal_verdaux *vd_auxptr; /* vd_aux as pointer. */ + unsigned int vd_exp_refno; /* Used by the linker. */ +} Elf_Internal_Verdef; + +/* This structure appears in a SHT_GNU_verdef section. */ + +typedef struct elf_internal_verdaux { + unsigned long vda_name; /* String table offset of name. */ + unsigned long vda_next; /* Offset to next verdaux. */ + + /* These fields are set up when BFD reads in the structure. FIXME: + It would be cleaner to store these in a different structure. */ + const char *vda_nodename; /* vda_name as pointer. */ + struct elf_internal_verdaux *vda_nextptr; /* vda_next as pointer. */ +} Elf_Internal_Verdaux; + +/* This structure appears in a SHT_GNU_verneed section. */ + +typedef struct elf_internal_verneed { + unsigned short vn_version; /* Version number of structure. */ + unsigned short vn_cnt; /* Number of vernaux entries. */ + unsigned long vn_file; /* String table offset of library name. */ + unsigned long vn_aux; /* Offset to vernaux entries. */ + unsigned long vn_next; /* Offset to next verneed. */ + + /* These fields are set up when BFD reads in the structure. FIXME: + It would be cleaner to store these in a different structure. */ + bfd *vn_bfd; /* BFD. */ + const char *vn_filename; /* vn_file as pointer. */ + struct elf_internal_vernaux *vn_auxptr; /* vn_aux as pointer. */ + struct elf_internal_verneed *vn_nextref; /* vn_nextref as pointer. */ +} Elf_Internal_Verneed; + +/* This structure appears in a SHT_GNU_verneed section. */ + +typedef struct elf_internal_vernaux { + unsigned long vna_hash; /* Hash of dependency name. */ + unsigned short vna_flags; /* Flags (VER_FLG_*). */ + unsigned short vna_other; /* Unused. */ + unsigned long vna_name; /* String table offset to version name. */ + unsigned long vna_next; /* Offset to next vernaux. */ + + /* These fields are set up when BFD reads in the structure. FIXME: + It would be cleaner to store these in a different structure. */ + const char *vna_nodename; /* vna_name as pointer. */ + struct elf_internal_vernaux *vna_nextptr; /* vna_next as pointer. */ +} Elf_Internal_Vernaux; + +/* This structure appears in a SHT_GNU_versym section. This is not a + standard ELF structure; ELF just uses Elf32_Half. */ + +typedef struct elf_internal_versym { + unsigned short vs_vers; +} Elf_Internal_Versym; + +/* Structure for syminfo section. */ +typedef struct +{ + unsigned short int si_boundto; + unsigned short int si_flags; +} Elf_Internal_Syminfo; + +/* This structure appears on the stack and in NT_AUXV core file notes. */ +typedef struct +{ + bfd_vma a_type; + bfd_vma a_val; +} Elf_Internal_Auxv; + + +/* This structure is used to describe how sections should be assigned + to program segments. */ + +struct elf_segment_map +{ + /* Next program segment. */ + struct elf_segment_map *next; + /* Program segment type. */ + unsigned long p_type; + /* Program segment flags. */ + unsigned long p_flags; + /* Program segment physical address. */ + bfd_vma p_paddr; + /* Program segment virtual address offset from section vma. */ + bfd_vma p_vaddr_offset; + /* Program segment alignment. */ + bfd_vma p_align; + /* Segment size in file and memory */ + bfd_vma p_size; + /* Required size of filehdr + phdrs, if non-zero */ + bfd_vma header_size; + /* Whether the p_flags field is valid; if not, the flags are based + on the section flags. */ + unsigned int p_flags_valid : 1; + /* Whether the p_paddr field is valid; if not, the physical address + is based on the section lma values. */ + unsigned int p_paddr_valid : 1; + /* Whether the p_align field is valid; if not, PT_LOAD segment + alignment is based on the default maximum page size. */ + unsigned int p_align_valid : 1; + /* Whether the p_size field is valid; if not, the size are based + on the section sizes. */ + unsigned int p_size_valid : 1; + /* Whether this segment includes the file header. */ + unsigned int includes_filehdr : 1; + /* Whether this segment includes the program headers. */ + unsigned int includes_phdrs : 1; + /* Number of sections (may be 0). */ + unsigned int count; + /* Sections. Actual number of elements is in count field. */ + asection *sections[1]; +}; + +/* .tbss is special. It doesn't contribute memory space to normal + segments and it doesn't take file space in normal segments. */ +#define ELF_TBSS_SPECIAL(sec_hdr, segment) \ + (((sec_hdr)->sh_flags & SHF_TLS) != 0 \ + && (sec_hdr)->sh_type == SHT_NOBITS \ + && (segment)->p_type != PT_TLS) + +#define ELF_SECTION_SIZE(sec_hdr, segment) \ + (ELF_TBSS_SPECIAL(sec_hdr, segment) ? 0 : (sec_hdr)->sh_size) + +/* Decide if the section SEC_HDR is in SEGMENT. If CHECK_VMA, then + VMAs are checked for alloc sections. If STRICT, then a zero size + section won't match at the end of a segment, unless the segment + is also zero size. Regardless of STRICT and CHECK_VMA, zero size + sections won't match at the start or end of PT_DYNAMIC, unless + PT_DYNAMIC is itself zero sized. */ +#define ELF_SECTION_IN_SEGMENT_1(sec_hdr, segment, check_vma, strict) \ + ((/* Only PT_LOAD, PT_GNU_RELRO and PT_TLS segments can contain \ + SHF_TLS sections. */ \ + ((((sec_hdr)->sh_flags & SHF_TLS) != 0) \ + && ((segment)->p_type == PT_TLS \ + || (segment)->p_type == PT_GNU_RELRO \ + || (segment)->p_type == PT_LOAD)) \ + /* PT_TLS segment contains only SHF_TLS sections, PT_PHDR no \ + sections at all. */ \ + || (((sec_hdr)->sh_flags & SHF_TLS) == 0 \ + && (segment)->p_type != PT_TLS \ + && (segment)->p_type != PT_PHDR)) \ + /* Any section besides one of type SHT_NOBITS must have file \ + offsets within the segment. */ \ + && ((sec_hdr)->sh_type == SHT_NOBITS \ + || ((bfd_vma) (sec_hdr)->sh_offset >= (segment)->p_offset \ + && (!(strict) \ + || ((sec_hdr)->sh_offset - (segment)->p_offset \ + <= (segment)->p_filesz - 1)) \ + && (((sec_hdr)->sh_offset - (segment)->p_offset \ + + ELF_SECTION_SIZE(sec_hdr, segment)) \ + <= (segment)->p_filesz))) \ + /* SHF_ALLOC sections must have VMAs within the segment. */ \ + && (!(check_vma) \ + || ((sec_hdr)->sh_flags & SHF_ALLOC) == 0 \ + || ((sec_hdr)->sh_addr >= (segment)->p_vaddr \ + && (!(strict) \ + || ((sec_hdr)->sh_addr - (segment)->p_vaddr \ + <= (segment)->p_memsz - 1)) \ + && (((sec_hdr)->sh_addr - (segment)->p_vaddr \ + + ELF_SECTION_SIZE(sec_hdr, segment)) \ + <= (segment)->p_memsz))) \ + /* No zero size sections at start or end of PT_DYNAMIC. */ \ + && ((segment)->p_type != PT_DYNAMIC \ + || (sec_hdr)->sh_size != 0 \ + || (segment)->p_memsz == 0 \ + || (((sec_hdr)->sh_type == SHT_NOBITS \ + || ((bfd_vma) (sec_hdr)->sh_offset > (segment)->p_offset \ + && ((sec_hdr)->sh_offset - (segment)->p_offset \ + < (segment)->p_filesz))) \ + && (((sec_hdr)->sh_flags & SHF_ALLOC) == 0 \ + || ((sec_hdr)->sh_addr > (segment)->p_vaddr \ + && ((sec_hdr)->sh_addr - (segment)->p_vaddr \ + < (segment)->p_memsz)))))) + +#define ELF_SECTION_IN_SEGMENT(sec_hdr, segment) \ + (ELF_SECTION_IN_SEGMENT_1 (sec_hdr, segment, 1, 0)) + +#define ELF_SECTION_IN_SEGMENT_STRICT(sec_hdr, segment) \ + (ELF_SECTION_IN_SEGMENT_1 (sec_hdr, segment, 1, 1)) + +#endif /* _ELF_INTERNAL_H */ |