253 lines
9.1 KiB
C
253 lines
9.1 KiB
C
/*
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* File elf_private.h - definitions for processing of ELF files
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*
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* Copyright (C) 1996, Eric Youngdale.
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* 1999-2007 Eric Pouech
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#define IMAGE_NO_MAP ((void*)-1)
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struct elf_header
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{
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UINT8 e_ident[16]; /* Magic number and other info */
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UINT16 e_type; /* Object file type */
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UINT16 e_machine; /* Architecture */
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UINT32 e_version; /* Object file version */
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UINT64 e_entry; /* Entry point virtual address */
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UINT64 e_phoff; /* Program header table file offset */
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UINT64 e_shoff; /* Section header table file offset */
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UINT32 e_flags; /* Processor-specific flags */
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UINT16 e_ehsize; /* ELF header size in bytes */
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UINT16 e_phentsize; /* Program header table entry size */
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UINT16 e_phnum; /* Program header table entry count */
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UINT16 e_shentsize; /* Section header table entry size */
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UINT16 e_shnum; /* Section header table entry count */
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UINT16 e_shstrndx; /* Section header string table index */
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};
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struct elf_section_header
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{
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UINT32 sh_name; /* Section name (string tbl index) */
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UINT32 sh_type; /* Section type */
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UINT64 sh_flags; /* Section flags */
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UINT64 sh_addr; /* Section virtual addr at execution */
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UINT64 sh_offset; /* Section file offset */
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UINT64 sh_size; /* Section size in bytes */
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UINT32 sh_link; /* Link to another section */
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UINT32 sh_info; /* Additional section information */
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UINT64 sh_addralign; /* Section alignment */
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UINT64 sh_entsize; /* Entry size if section holds table */
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};
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struct macho_load_command
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{
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UINT32 cmd; /* type of load command */
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UINT32 cmdsize; /* total size of command in bytes */
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};
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struct macho_uuid_command
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{
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UINT32 cmd; /* LC_UUID */
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UINT32 cmdsize;
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UINT8 uuid[16];
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};
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struct macho_section
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{
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char sectname[16]; /* name of this section */
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char segname[16]; /* segment this section goes in */
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UINT64 addr; /* memory address of this section */
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UINT64 size; /* size in bytes of this section */
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UINT32 offset; /* file offset of this section */
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UINT32 align; /* section alignment (power of 2) */
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UINT32 reloff; /* file offset of relocation entries */
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UINT32 nreloc; /* number of relocation entries */
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UINT32 flags; /* flags (section type and attributes)*/
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UINT32 reserved1; /* reserved (for offset or index) */
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UINT32 reserved2; /* reserved (for count or sizeof) */
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UINT32 reserved3; /* reserved */
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};
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struct macho_section32
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{
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char sectname[16]; /* name of this section */
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char segname[16]; /* segment this section goes in */
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UINT32 addr; /* memory address of this section */
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UINT32 size; /* size in bytes of this section */
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UINT32 offset; /* file offset of this section */
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UINT32 align; /* section alignment (power of 2) */
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UINT32 reloff; /* file offset of relocation entries */
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UINT32 nreloc; /* number of relocation entries */
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UINT32 flags; /* flags (section type and attributes)*/
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UINT32 reserved1; /* reserved (for offset or index) */
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UINT32 reserved2; /* reserved (for count or sizeof) */
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};
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/* structure holding information while handling an ELF image
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* allows one by one section mapping for memory savings
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*/
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struct image_file_map
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{
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enum module_type modtype;
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const struct image_file_map_ops *ops;
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unsigned addr_size; /* either 16 (not used), 32 or 64 */
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struct image_file_map* alternate; /* another file linked to this one */
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union
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{
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struct elf_file_map
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{
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size_t elf_size;
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size_t elf_start;
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HANDLE handle;
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const char* shstrtab;
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char* target_copy;
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struct elf_header elfhdr;
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struct
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{
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struct elf_section_header shdr;
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const char* mapped;
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}* sect;
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} elf;
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struct macho_file_map
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{
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size_t segs_size;
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size_t segs_start;
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HANDLE handle;
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struct image_file_map* dsym; /* the debug symbols file associated with this one */
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size_t header_size; /* size of real header in file */
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size_t commands_size;
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unsigned int commands_count;
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const struct macho_load_command* load_commands;
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const struct macho_uuid_command* uuid;
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/* The offset in the file which is this architecture. mach_header was
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* read from arch_offset. */
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unsigned arch_offset;
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int num_sections;
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struct
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{
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struct macho_section section;
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const char* mapped;
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unsigned int ignored : 1;
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}* sect;
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} macho;
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struct pe_file_map
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{
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HANDLE hMap;
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IMAGE_FILE_HEADER file_header;
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union
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{
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IMAGE_OPTIONAL_HEADER32 header32;
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IMAGE_OPTIONAL_HEADER64 header64;
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} opt;
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BOOL builtin;
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unsigned full_count;
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void* full_map;
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struct
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{
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IMAGE_SECTION_HEADER shdr;
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const char* mapped;
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}* sect;
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const char* strtable;
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} pe;
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} u;
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};
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struct image_section_map
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{
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struct image_file_map* fmap;
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LONG_PTR sidx;
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};
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struct stab_nlist
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{
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unsigned n_strx;
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unsigned char n_type;
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char n_other;
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short n_desc;
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unsigned n_value;
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};
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struct macho64_nlist
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{
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unsigned n_strx;
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unsigned char n_type;
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char n_other;
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short n_desc;
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UINT64 n_value;
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};
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BOOL image_check_alternate(struct image_file_map* fmap, const struct module* module) DECLSPEC_HIDDEN;
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struct image_file_map* image_load_debugaltlink(struct image_file_map* fmap, struct module* module) DECLSPEC_HIDDEN;
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BOOL elf_map_handle(HANDLE handle, struct image_file_map* fmap) DECLSPEC_HIDDEN;
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BOOL pe_map_file(HANDLE file, struct image_file_map* fmap, enum module_type mt) DECLSPEC_HIDDEN;
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struct image_file_map_ops
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{
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const char* (*map_section)(struct image_section_map* ism);
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void (*unmap_section)(struct image_section_map* ism);
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BOOL (*find_section)(struct image_file_map* fmap, const char* name, struct image_section_map* ism);
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DWORD_PTR (*get_map_rva)(const struct image_section_map* ism);
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unsigned (*get_map_size)(const struct image_section_map* ism);
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void (*unmap_file)(struct image_file_map *fmap);
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};
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static inline BOOL image_find_section(struct image_file_map* fmap, const char* name,
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struct image_section_map* ism)
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{
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while (fmap)
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{
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if (fmap->ops->find_section(fmap, name, ism)) return TRUE;
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fmap = fmap->alternate;
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}
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ism->fmap = NULL;
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ism->sidx = -1;
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return FALSE;
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}
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static inline void image_unmap_file(struct image_file_map* fmap)
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{
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while (fmap)
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{
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fmap->ops->unmap_file(fmap);
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fmap = fmap->alternate;
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}
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}
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static inline const char* image_map_section(struct image_section_map* ism)
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{
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return ism->fmap ? ism->fmap->ops->map_section(ism) : NULL;
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}
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static inline void image_unmap_section(struct image_section_map* ism)
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{
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if (ism->fmap) ism->fmap->ops->unmap_section(ism);
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}
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static inline DWORD_PTR image_get_map_rva(const struct image_section_map* ism)
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{
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return ism->fmap ? ism->fmap->ops->get_map_rva(ism) : 0;
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}
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static inline unsigned image_get_map_size(const struct image_section_map* ism)
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{
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return ism->fmap ? ism->fmap->ops->get_map_size(ism) : 0;
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}
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