| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_ZUCCHINI_TYPE_ELF_H_ |
| #define COMPONENTS_ZUCCHINI_TYPE_ELF_H_ |
| |
| #include <stdint.h> |
| |
| namespace zucchini { |
| |
| // Structures and constants taken from linux/elf.h and following identical |
| // layout. This is used for parsing of Executable and Linkable Format (ELF). |
| namespace elf { |
| // Supported by MSVC, g++, and clang++. Ensures no gaps in packing. |
| #pragma pack(push, 1) |
| |
| // This header defines various types from the ELF file spec, but no code |
| // related to using them. |
| |
| typedef uint32_t Elf32_Addr; // Unsigned program address. |
| typedef uint16_t Elf32_Half; // Unsigned medium integer. |
| typedef uint32_t Elf32_Off; // Unsigned file offset. |
| typedef int32_t Elf32_Sword; // Signed large integer. |
| typedef uint32_t Elf32_Word; // Unsigned large integer. |
| |
| typedef uint64_t Elf64_Addr; // Unsigned program address. |
| typedef uint16_t Elf64_Half; // Unsigned medium integer. |
| typedef uint64_t Elf64_Off; // Unsigned file offset. |
| typedef int32_t Elf64_Sword; // Signed large integer. |
| typedef uint32_t Elf64_Word; // Unsigned large integer. |
| typedef int64_t Elf64_Sxword; // Signed extra large integer. |
| typedef uint64_t Elf64_Xword; // Unsigned extra large integer. |
| |
| // The header at the top of the file. |
| struct Elf32_Ehdr { |
| unsigned char e_ident[16]; |
| Elf32_Half e_type; |
| Elf32_Half e_machine; |
| Elf32_Word e_version; |
| Elf32_Addr e_entry; |
| Elf32_Off e_phoff; |
| Elf32_Off e_shoff; |
| Elf32_Word e_flags; |
| Elf32_Half e_ehsize; |
| Elf32_Half e_phentsize; |
| Elf32_Half e_phnum; |
| Elf32_Half e_shentsize; |
| Elf32_Half e_shnum; |
| Elf32_Half e_shstrndx; |
| }; |
| |
| struct Elf64_Ehdr { |
| unsigned char e_ident[16]; |
| Elf64_Half e_type; |
| Elf64_Half e_machine; |
| Elf64_Word e_version; |
| Elf64_Addr e_entry; |
| Elf64_Off e_phoff; |
| Elf64_Off e_shoff; |
| Elf64_Word e_flags; |
| Elf64_Half e_ehsize; |
| Elf64_Half e_phentsize; |
| Elf64_Half e_phnum; |
| Elf64_Half e_shentsize; |
| Elf64_Half e_shnum; |
| Elf64_Half e_shstrndx; |
| }; |
| |
| // Identification Indexes in header->e_ident. |
| enum IdentificationIndex { |
| EI_MAG0 = 0, // File identification. |
| EI_MAG1 = 1, // File identification. |
| EI_MAG2 = 2, // File identification. |
| EI_MAG3 = 3, // File identification. |
| EI_CLASS = 4, // File class. |
| EI_DATA = 5, // Data encoding. |
| EI_VERSION = 6, // File version. |
| EI_OSABI = 7, // Operating system/ABI identification. |
| EI_ABIVERSION = 8, // ABI version. |
| EI_PAD = 9, // Start of padding bytes. |
| EI_NIDENT = 16 // Size of e_ident[]. |
| }; |
| |
| // Values for header->e_ident[EI_CLASS]. |
| enum FileClass { |
| ELFCLASSNONE = 0, // Invalid class. |
| ELFCLASS32 = 1, // 32-bit objects. |
| ELFCLASS64 = 2 // 64-bit objects. |
| }; |
| |
| // Values for header->e_type. |
| enum FileType { |
| ET_NONE = 0, // No file type |
| ET_REL = 1, // Relocatable file |
| ET_EXEC = 2, // Executable file |
| ET_DYN = 3, // Shared object file |
| ET_CORE = 4, // Core file |
| ET_LOPROC = 0xFF00, // Processor-specific |
| ET_HIPROC = 0xFFFF // Processor-specific |
| }; |
| |
| // Values for header->e_machine. |
| enum MachineArchitecture { |
| EM_NONE = 0, // No machine. |
| EM_386 = 3, // Intel Architecture. |
| EM_ARM = 40, // ARM Architecture. |
| EM_X86_64 = 62, // Intel x86-64 Architecture. |
| EM_AARCH64 = 183, // ARM Architecture, 64-bit. |
| // Other values skipped. |
| }; |
| |
| // A section header in the section header table. |
| struct Elf32_Shdr { |
| Elf32_Word sh_name; |
| Elf32_Word sh_type; |
| Elf32_Word sh_flags; |
| Elf32_Addr sh_addr; |
| Elf32_Off sh_offset; |
| Elf32_Word sh_size; |
| Elf32_Word sh_link; |
| Elf32_Word sh_info; |
| Elf32_Word sh_addralign; |
| Elf32_Word sh_entsize; |
| }; |
| |
| struct Elf64_Shdr { |
| Elf64_Word sh_name; |
| Elf64_Word sh_type; |
| Elf64_Xword sh_flags; |
| Elf64_Addr sh_addr; |
| Elf64_Off sh_offset; |
| Elf64_Xword sh_size; |
| Elf64_Word sh_link; |
| Elf64_Word sh_info; |
| Elf64_Xword sh_addralign; |
| Elf64_Xword sh_entsize; |
| }; |
| |
| // Values for the section type field in a section header. |
| enum sh_type_values { |
| SHT_NULL = 0, |
| SHT_PROGBITS = 1, |
| SHT_SYMTAB = 2, |
| SHT_STRTAB = 3, |
| SHT_RELA = 4, |
| SHT_HASH = 5, |
| SHT_DYNAMIC = 6, |
| SHT_NOTE = 7, |
| SHT_NOBITS = 8, |
| SHT_REL = 9, |
| SHT_SHLIB = 10, |
| SHT_DYNSYM = 11, |
| SHT_INIT_ARRAY = 14, |
| SHT_FINI_ARRAY = 15, |
| SHT_LOPROC = 0x70000000, |
| SHT_HIPROC = 0x7FFFFFFF, |
| SHT_LOUSER = 0x80000000, |
| SHT_HIUSER = 0xFFFFFFFF |
| }; |
| |
| enum sh_flag_masks { |
| SHF_WRITE = 1 << 0, |
| SHF_ALLOC = 1 << 1, |
| SHF_EXECINSTR = 1 << 2, |
| // 1 << 3 is reserved. |
| SHF_MERGE = 1 << 4, |
| SHF_STRINGS = 1 << 5, |
| SHF_INFO_LINK = 1 << 6, |
| SHF_LINK_ORDER = 1 << 7, |
| SHF_OS_NONCONFORMING = 1 << 8, |
| SHF_GROUP = 1 << 9, |
| SHF_TLS = 1 << 10, |
| SHF_COMPRESSED = 1 << 11, |
| }; |
| |
| struct Elf32_Phdr { |
| Elf32_Word p_type; |
| Elf32_Off p_offset; |
| Elf32_Addr p_vaddr; |
| Elf32_Addr p_paddr; |
| Elf32_Word p_filesz; |
| Elf32_Word p_memsz; |
| Elf32_Word p_flags; |
| Elf32_Word p_align; |
| }; |
| |
| struct Elf64_Phdr { |
| Elf64_Word p_type; |
| Elf64_Word p_flags; |
| Elf64_Off p_offset; |
| Elf64_Addr p_vaddr; |
| Elf64_Addr p_paddr; |
| Elf64_Xword p_filesz; |
| Elf64_Xword p_memsz; |
| Elf64_Xword p_align; |
| }; |
| |
| // Values for the segment type field in a program segment header. |
| enum ph_type_values { |
| PT_NULL = 0, |
| PT_LOAD = 1, |
| PT_DYNAMIC = 2, |
| PT_INTERP = 3, |
| PT_NOTE = 4, |
| PT_SHLIB = 5, |
| PT_PHDR = 6, |
| PT_LOPROC = 0x70000000, |
| PT_HIPROC = 0x7FFFFFFF |
| }; |
| |
| struct Elf32_Rel { |
| Elf32_Addr r_offset; |
| Elf32_Word r_info; |
| }; |
| |
| struct Elf64_Rel { |
| Elf64_Addr r_offset; |
| Elf64_Xword r_info; |
| }; |
| |
| struct Elf32_Rela { |
| Elf32_Addr r_offset; |
| Elf32_Word r_info; |
| Elf32_Sword r_addend; |
| }; |
| |
| struct Elf64_Rela { |
| Elf64_Addr r_offset; |
| Elf64_Xword r_info; |
| Elf64_Sxword r_addend; |
| }; |
| |
| enum elf32_rel_386_type_values { |
| R_386_NONE = 0, |
| R_386_32 = 1, |
| R_386_PC32 = 2, |
| R_386_GOT32 = 3, |
| R_386_PLT32 = 4, |
| R_386_COPY = 5, |
| R_386_GLOB_DAT = 6, |
| R_386_JMP_SLOT = 7, |
| R_386_RELATIVE = 8, |
| R_386_GOTOFF = 9, |
| R_386_GOTPC = 10, |
| R_386_TLS_TPOFF = 14, |
| }; |
| |
| enum elf32_rel_x86_64_type_values { |
| R_X86_64_NONE = 0, |
| R_X86_64_64 = 1, |
| R_X86_64_PC32 = 2, |
| R_X86_64_GOT32 = 3, |
| R_X86_64_PLT32 = 4, |
| R_X86_64_COPY = 5, |
| R_X86_64_GLOB_DAT = 6, |
| R_X86_64_JUMP_SLOT = 7, |
| R_X86_64_RELATIVE = 8, |
| R_X86_64_GOTPCREL = 9, |
| R_X86_64_32 = 10, |
| R_X86_64_32S = 11, |
| R_X86_64_16 = 12, |
| R_X86_64_PC16 = 13, |
| R_X86_64_8 = 14, |
| R_X86_64_PC8 = 15, |
| }; |
| |
| enum elf32_rel_arm_type_values { |
| R_ARM_RELATIVE = 23, |
| }; |
| |
| enum elf64_rel_aarch64_type_values { |
| R_AARCH64_GLOB_DAT = 0x401, |
| R_AARCH64_JUMP_SLOT = 0x402, |
| R_AARCH64_RELATIVE = 0x403, |
| }; |
| |
| #pragma pack(pop) |
| |
| } // namespace elf |
| } // namespace zucchini |
| |
| #endif // COMPONENTS_ZUCCHINI_TYPE_ELF_H_ |