mirror of
https://github.com/xomboverlord/ldc.git
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382 lines
18 KiB
C
382 lines
18 KiB
C
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/* ELF file format */
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typedef unsigned short elf_u16_f32;
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typedef unsigned int elf_u32_f32;
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typedef int elf_s32_f32;
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typedef unsigned int elf_add_f32;
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typedef unsigned int elf_off_f32;
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typedef unsigned char elf_u8_f32;
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#define EI_NIDENT 16
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typedef struct
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{
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// unsigned char EHident[EI_NIDENT]; /* Header identification info */
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#define EI_MAG0 0 /* Identification byte offset 0*/
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#define EI_MAG1 1 /* Identification byte offset 1*/
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#define EI_MAG2 2 /* Identification byte offset 2*/
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#define EI_MAG3 3 /* Identification byte offset 3*/
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#define ELFMAG0 0x7f /* Magic number byte 0 */
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#define ELFMAG1 'E' /* Magic number byte 1 */
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#define ELFMAG2 'L' /* Magic number byte 2 */
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#define ELFMAG3 'F' /* Magic number byte 3 */
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#define EI_CLASS 4 /* File class byte offset 4 */
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#define ELFCLASSNONE 0 // invalid
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#define ELFCLASS32 1 /* 32-bit objects */
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#define ELFCLASS64 2 /* 64-bit objects */
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#define EI_DATA 5 /* Data encoding byte offset 5 */
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#define ELFDATANONE 0 // invalid
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#define ELFDATA2LSB 1 /* 2's comp,lsb low address */
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#define ELFDATA2MSB 2 /* 2's comp,msb low address */
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#define EI_VERSION 6 /* Header version byte offset 6 */
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//#define EV_CURRENT 1 /* Current header format */
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#define EI_OSABI 7 /* OS ABI byte offset 7 */
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#define ELFOSABI_SYSV 0 /* UNIX System V ABI */
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#define ELFOSABI_HPUX 1 /* HP-UX */
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#define ELFOSABI_NETBSD 2
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#define ELFOSABI_LINUX 3
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#define ELFOSABI_FREEBSD 9
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#define ELFOSABI_ARM 97 /* ARM */
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#define ELFOSABI_STANDALONE 255 /* Standalone/embedded */
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#define EI_ABIVERSION 8 /* ABI version byte offset 8 */
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#define EI_PAD 9 /* Byte to start of padding */
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elf_u16_f32 e_type; /* Object file type */
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#define ET_NONE 0 /* No specified file type */
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#define ET_REL 1 /* Relocatable object file */
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#define ET_EXEC 2 /* Executable file */
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#define ET_DYN 3 /* Dynamic link object file */
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#define ET_CORE 4 /* Core file */
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#define ET_LOPROC 0xff00 /* Processor low index */
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#define ET_HIPROC 0xffff /* Processor hi index */
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elf_u16_f32 e_machine; /* Machine architecture */
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#define EM_386 3 /* Intel 80386 */
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#define EM_486 6 /* Intel 80486 */
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#define EM_X86_64 62 // Advanced Micro Devices X86-64 processor
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elf_u32_f32 e_version; /* File format version */
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#define EV_NONE 0 // invalid version
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#define EV_CURRENT 1 // Current file format
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elf_add_f32 e_entry; /* Entry point virtual address */
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elf_off_f32 e_phoff; /* Program header table(PHT)offset */
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elf_off_f32 e_shoff; /* Section header table(SHT)offset */
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elf_u32_f32 e_flags; /* Processor-specific flags */
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elf_u16_f32 e_ehsize; /* Size of ELF header (bytes) */
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#define EH_HEADER_SIZE 0x34
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elf_u16_f32 e_phentsize; /* Size of PHT (bytes) */
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#define EH_PHTENT_SIZE 0x20
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elf_u16_f32 e_phnum; /* Number of PHT entries */
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elf_u16_f32 e_shentsize; /* Size of SHT entry in bytes */
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#define EH_SHTENT_SIZE 0x28
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elf_u16_f32 e_shnum; /* Number of SHT entries */
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elf_u16_f32 e_shstrndx; /* SHT index for string table */
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} Elf32_Hdr;
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/* Section header. */
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typedef struct
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{
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elf_u32_f32 sh_name; /* String table offset for section name */
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elf_u32_f32 sh_type; /* Section type */
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#define SHT_NULL 0 /* SHT entry unused */
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#define SHT_PROGDEF 1 /* Program defined data */
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#define SHT_SYMTAB 2 /* Symbol table */
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#define SHT_STRTAB 3 /* String table */
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#define SHT_RELA 4 /* Relocations with addends */
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#define SHT_HASHTAB 5 /* Symbol hash table */
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#define SHT_DYNAMIC 6 /* String table for dynamic symbols */
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#define SHT_NOTE 7 /* Notes */
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#define SHT_RESDATA 8 /* Reserved data space */
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#define SHT_NOBITS SHT_RESDATA
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#define SHT_REL 9 /* Relocations no addends */
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#define SHT_RESTYPE 10 /* Reserved section type*/
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#define SHT_DYNTAB 11 /* Dynamic linker symbol table */
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#define SHT_GROUP 17 /* Section group (COMDAT) */
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elf_u32_f32 sh_flags; /* Section attribute flags */
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#define SHF_WRITE (1 << 0) /* Writable during execution */
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#define SHF_ALLOC (1 << 1) /* In memory during execution */
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#define SHF_EXECINSTR (1 << 2) /* Executable machine instructions*/
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#define SHF_TLS (1 << 10) /* Thread local */
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#define SHF_MASKPROC 0xf0000000 /* Mask for processor-specific */
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elf_add_f32 sh_addr; /* Starting virtual memory address */
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elf_off_f32 sh_offset; /* Offset to section in file */
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elf_u32_f32 sh_size; /* Size of section */
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elf_u32_f32 sh_link; /* Index to optional related section */
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elf_u32_f32 sh_info; /* Optional extra section information */
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elf_u32_f32 sh_addralign; /* Required section alignment */
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elf_u32_f32 sh_entsize; /* Size of fixed size section entries */
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} Elf32_Shdr;
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// Special Section Header Table Indices
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#define SHT_UNDEF 0 /* Undefined section */
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#define SHT_ABS 0xfff1 /* Absolute value for symbol references */
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#define SHT_COMMON 0xfff2 /* Symbol defined in common section */
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#define SHT_RESVSTART 0xff00 /* Start of reserved indices */
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#define SHT_PROCSTART 0xff00 /* Start of processor-specific */
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#define SHT_PROCEND 0xff1f /* End of processor-specific */
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#define SHT_RESVEND 0xffff /* End of reserved indices */
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/* Symbol Table */
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typedef struct
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{
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elf_u32_f32 st_name; /* string table index for symbol name */
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elf_add_f32 st_value; /* Associated symbol value */
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elf_u32_f32 st_size; /* Symbol size */
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unsigned char st_info; /* Symbol type and binding */
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#define ELF_ST_BIND(s) ((s)>>4)
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#define ELF_ST_TYPE(s) ((s)&0xf)
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#define ELF_ST_INFO(b,t) (((b) << 4) + ((t) & 0xf))
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#define STB_LOCAL 0 /* Local symbol */
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#define STB_GLOBAL 1 /* Global symbol */
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#define STB_WEAK 2 /* Weak symbol */
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#define ST_NUM_BINDINGS 3 /* Number of defined types. */
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#define STB_LOOS 10 /* Start of OS-specific */
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#define STB_HIOS 12 /* End of OS-specific */
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#define STB_LOPROC 13 /* Start of processor-specific */
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#define STB_HIPROC 15 /* End of processor-specific */
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#define STT_NOTYPE 0 /* Symbol type is unspecified */
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#define STT_OBJECT 1 /* Symbol is a data object */
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#define STT_FUNC 2 /* Symbol is a code object */
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#define STT_SECTION 3 /* Symbol associated with a section */
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#define STT_FILE 4 /* Symbol's name is file name */
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#define STT_COMMON 5
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#define STT_TLS 6
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#define STT_NUM 5 /* Number of defined types. */
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#define STT_LOOS 11 /* Start of OS-specific */
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#define STT_HIOS 12 /* End of OS-specific */
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#define STT_LOPROC 13 /* Start of processor-specific */
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#define STT_HIPROC 15 /* End of processor-specific */
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unsigned char st_other; /* Currently not defined */
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elf_u16_f32 st_shndx; /* SHT index for symbol definition */
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} Elf32_Sym;
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/* Relocation table entry without addend (in section of type SHT_REL). */
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typedef struct
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{
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elf_add_f32 r_offset; /* Address */
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elf_u32_f32 r_info; /* Relocation type and symbol index */
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#define ELF32_R_IDX(i) ((i) >> 8) /* Symbol idx */
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#define ELF32_R_TYPE(i)((i) & 0xff) /* Type of relocation */
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#define ELF32_R_INFO(i, t) (((i) << 8) + ((t) & 0xff))
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#define RI_TYPE_NONE 0 /* No reloc */
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#define RI_TYPE_SYM32 1 /* Symbol value 32 bit */
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#define RI_TYPE_PC32 2 /* PC relative 32 bit */
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#define RI_TYPE_GOT32 3 /* 32 bit GOT entry */
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#define RI_TYPE_PLT32 4 /* 32 bit PLT address */
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#define RI_TYPE_COPY 5 /* Copy symbol at runtime */
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#define RI_TYPE_GLOBDAT 6 /* Create GOT entry */
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#define RI_TYPE_JMPSLOT 7 /* Create PLT entry */
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#define RI_TYPE_REL 8 /* Adjust by program base */
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#define RI_TYPE_GOTOFF 9 /* 32 bit offset to GOT */
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#define RI_TYPE_GOTPC 10 /* 32 bit PC relative offset to GOT */
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#define RI_TYPE_TLS_TPOFF 14
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#define RI_TYPE_TLS_IE 15
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#define RI_TYPE_TLS_GOTIE 16
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#define RI_TYPE_TLS_LE 17 /* negative offset relative to static TLS */
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#define RI_TYPE_TLS_GD 18
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#define RI_TYPE_TLS_LDM 19
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#define RI_TYPE_TLS_GD_32 24
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#define RI_TYPE_TLS_GD_PUSH 25
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#define RI_TYPE_TLS_GD_CALL 26
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#define RI_TYPE_TLS_GD_POP 27
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#define RI_TYPE_TLS_LDM_32 28
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#define RI_TYPE_TLS_LDM_PUSH 29
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#define RI_TYPE_TLS_LDM_CALL 30
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#define RI_TYPE_TLS_LDM_POP 31
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#define RI_TYPE_TLS_LDO_32 32
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#define RI_TYPE_TLS_IE_32 33
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#define RI_TYPE_TLS_LE_32 34
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#define RI_TYPE_TLS_DTPMOD32 35
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#define RI_TYPE_TLS_DTPOFF32 36
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#define RI_TYPE_TLS_TPOFF32 37
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} Elf32_Rel;
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/* stabs debug records */
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typedef struct
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{
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elf_u32_f32 DBstring; /* string table index for the symbol */
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elf_u8_f32 DBtype; /* type of the symbol */
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#define DBT_UNDEF 0x00 /* undefined symbol */
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#define DBT_EXT 0x01 /* exernal modifier */
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#define DBT_ABS 0x02 /* absolute */
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#define DBT_TEXT 0x04 /* code text */
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#define DBT_DATA 0x06 /* data */
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#define DBT_BSS 0x08 /* BSS */
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#define DBT_INDR 0x0a /* indirect to another symbol */
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#define DBT_COMM 0x12 /* common -visible after shr'd lib link */
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#define DBT_SETA 0x14 /* Absolue set element */
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#define DBT_SETT 0x16 /* code text segment set element */
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#define DBT_SETD 0x18 /* data segment set element */
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#define DBT_SETB 0x1a /* BSS segment set element */
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#define DBT_SETV 0x1c /* Pointer to set vector */
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#define DBT_WARNING 0x1e /* print warning during link */
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#define DBT_FN 0x1f /* name of object file */
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#define DBT_GSYM 0x20 /* global symbol */
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#define DBT_FUN 0x24 /* function name */
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#define DBT_STSYM 0x26 /* static data */
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#define DBT_LCSYM 0x28 /* static bss */
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#define DBT_MAIN 0x2a /* main routine */
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#define DBT_RO 0x2c /* read only */
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#define DBT_OPT 0x3c /* target option? */
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#define DBT_REG 0x40 /* register variable */
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#define DBT_TLINE 0x44 /* text line number */
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#define DBT_DLINE 0x46 /* dat line number */
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#define DBT_BLINE 0x48 /* bss line number */
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#define DBT_STUN 0x62 /* structure or union */
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#define DBT_SRCF 0x64 /* source file */
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#define DBT_AUTO 0x80 /* stack variable */
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#define DBT_TYPE 0x80 /* type definition */
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#define DBT_INCS 0x84 /* include file start */
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#define DBT_PARAM 0xa0 /* parameter */
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#define DBT_INCE 0xa2 /* include file end */
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elf_u8_f32 DBmisc; /* misc. info */
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elf_u16_f32 DBdesc; /* description field */
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elf_u32_f32 DBvalu; /* symbol value */
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} elf_stab;
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/* Program header. */
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typedef struct
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{
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elf_u32_f32 PHtype; /* Program type */
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#define PHT_NULL 0 /* SHT entry unused */
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elf_off_f32 PHoff; /* Offset to segment in file */
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elf_add_f32 PHvaddr; /* Starting virtual memory address */
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elf_add_f32 PHpaddr; /* Starting absolute memory address */
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elf_u32_f32 PHfilesz; /* Size of file image */
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elf_u32_f32 PHmemsz; /* Size of memory image */
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elf_u32_f32 PHflags; /* Program attribute flags */
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elf_u32_f32 PHalign; /* Program loading alignment */
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} elf_pht;
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/* Legal values for sh_flags (section flags). */
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/***************************** 64 bit Elf *****************************************/
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typedef unsigned long long Elf64_Addr;
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typedef unsigned long long Elf64_Off;
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typedef unsigned long long Elf64_Xword;
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typedef long long Elf64_Sxword;
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typedef int Elf64_Sword;
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typedef unsigned int Elf64_Word;
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typedef unsigned short Elf64_Half;
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typedef struct
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{
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Elf64_Half e_type;
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Elf64_Half e_machine;
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Elf64_Word e_version;
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Elf64_Addr e_entry;
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Elf64_Off e_phoff;
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Elf64_Off e_shoff;
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Elf64_Word e_flags;
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Elf64_Half e_ehsize;
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Elf64_Half e_phentsize;
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Elf64_Half e_phnum;
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Elf64_Half e_shentsize;
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Elf64_Half e_shnum;
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Elf64_Half e_shstrndx;
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} Elf64_Ehdr;
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typedef struct {
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Elf64_Word sh_name;
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Elf64_Word sh_type;
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Elf64_Xword sh_flags;
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Elf64_Addr sh_addr;
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Elf64_Off sh_offset;
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Elf64_Xword sh_size;
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Elf64_Word sh_link;
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Elf64_Word sh_info;
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Elf64_Xword sh_addralign;
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Elf64_Xword sh_entsize;
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} Elf64_Shdr;
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typedef struct {
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Elf64_Word p_type;
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Elf64_Word p_flags;
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Elf64_Off p_offset;
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Elf64_Addr p_vaddr;
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Elf64_Addr p_paddr;
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Elf64_Xword p_filesz;
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Elf64_Xword p_memsz;
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Elf64_Xword p_align;
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} Elf64_Phdr;
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typedef struct {
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Elf64_Word st_name;
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unsigned char st_info;
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unsigned char st_other;
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Elf64_Half st_shndx;
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Elf64_Addr st_value;
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Elf64_Xword st_size;
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} Elf64_Sym;
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typedef struct {
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Elf64_Addr r_offset;
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Elf64_Xword r_info;
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#define ELF64_R_SYM(i) ((Elf64_Word)((i)>>32))
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#define ELF64_R_TYPE(i) ((Elf64_Word)(i & 0xFFFFFFFF))
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#define ELF64_R_INFO(s,t) ((((Elf64_Xword)(s))<<32)|(Elf64_Word)(t))
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// X86-64 Relocation types
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#define R_X86_64_NONE 0 // -- No relocation
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#define R_X86_64_64 1 // 64 Direct 64 bit
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#define R_X86_64_PC32 2 // 32 PC relative 32 bit signed
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#define R_X86_64_GOT32 3 // 32 32 bit GOT entry
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#define R_X86_64_PLT32 4 // 32 bit PLT address
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#define R_X86_64_COPY 5 // -- Copy symbol at runtime
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#define R_X86_64_GLOB_DAT 6 // 64 Create GOT entry
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#define R_X86_64_JUMP_SLOT 7 // 64 Create PLT entry
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#define R_X86_64_RELATIVE 8 // 64 Adjust by program base
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#define R_X86_64_GOTPCREL 9 // 32 32 bit signed pc relative offset to GOT
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#define R_X86_64_32 10 // 32 Direct 32 bit zero extended
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#define R_X86_64_32S 11 // 32 Direct 32 bit sign extended
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#define R_X86_64_16 12 // 16 Direct 16 bit zero extended
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#define R_X86_64_PC16 13 // 16 16 bit sign extended pc relative
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#define R_X86_64_8 14 // 8 Direct 8 bit sign extended
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#define R_X86_64_PC8 15 // 8 8 bit sign extended pc relative
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#define R_X86_64_DTPMOD64 16 // 64 ID of module containing symbol
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#define R_X86_64_DTPOFF64 17 // 64 Offset in TLS block
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#define R_X86_64_TPOFF64 18 // 64 Offset in initial TLS block
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#define R_X86_64_TLSGD 19 // 32 PC relative offset to GD GOT block
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#define R_X86_64_TLSLD 20 // 32 PC relative offset to LD GOT block
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#define R_X86_64_DTPOFF32 21 // 32 Offset in TLS block
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#define R_X86_64_GOTTPOFF 22 // 32 PC relative offset to IE GOT entry
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#define R_X86_64_TPOFF32 23 // 32 Offset in initial TLS block
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#define R_X86_64_PC64 24 // 64
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#define R_X86_64_GOTOFF64 25 // 64
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#define R_X86_64_GOTPC32 26 // 32
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#define R_X86_64_GNU_VTINHERIT 250 // GNU C++ hack
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#define R_X86_64_GNU_VTENTRY 251 // GNU C++ hack
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} Elf64_Rel;
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typedef struct {
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Elf64_Addr r_offset;
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Elf64_Xword r_info;
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Elf64_Sxword r_addend;
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} Elf64_Rela;
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