    const std = @import("std.zig");
    const io = std.io;
    const os = std.os;
    const math = std.math;
    const mem = std.mem;
    const assert = std.debug.assert;
    const File = std.fs.File;
    const native_endian = @import("builtin").target.cpu.arch.endian();

    pub const AT_NULL = 0;
    pub const AT_IGNORE = 1;
    pub const AT_EXECFD = 2;
    pub const AT_PHDR = 3;
    pub const AT_PHENT = 4;
    pub const AT_PHNUM = 5;
    pub const AT_PAGESZ = 6;
    pub const AT_BASE = 7;
    pub const AT_FLAGS = 8;
    pub const AT_ENTRY = 9;
    pub const AT_NOTELF = 10;
    pub const AT_UID = 11;
    pub const AT_EUID = 12;
    pub const AT_GID = 13;
    pub const AT_EGID = 14;
    pub const AT_CLKTCK = 17;
    pub const AT_PLATFORM = 15;
    pub const AT_HWCAP = 16;
    pub const AT_FPUCW = 18;
    pub const AT_DCACHEBSIZE = 19;
    pub const AT_ICACHEBSIZE = 20;
    pub const AT_UCACHEBSIZE = 21;
    pub const AT_IGNOREPPC = 22;
    pub const AT_SECURE = 23;
    pub const AT_BASE_PLATFORM = 24;
    pub const AT_RANDOM = 25;
    pub const AT_HWCAP2 = 26;
    pub const AT_EXECFN = 31;
    pub const AT_SYSINFO = 32;
    pub const AT_SYSINFO_EHDR = 33;
    pub const AT_L1I_CACHESHAPE = 34;
    pub const AT_L1D_CACHESHAPE = 35;
    pub const AT_L2_CACHESHAPE = 36;
    pub const AT_L3_CACHESHAPE = 37;
    pub const AT_L1I_CACHESIZE = 40;
    pub const AT_L1I_CACHEGEOMETRY = 41;
    pub const AT_L1D_CACHESIZE = 42;
    pub const AT_L1D_CACHEGEOMETRY = 43;
    pub const AT_L2_CACHESIZE = 44;
    pub const AT_L2_CACHEGEOMETRY = 45;
    pub const AT_L3_CACHESIZE = 46;
    pub const AT_L3_CACHEGEOMETRY = 47;

    pub const DT_NULL = 0;
    pub const DT_NEEDED = 1;
    pub const DT_PLTRELSZ = 2;
    pub const DT_PLTGOT = 3;
    pub const DT_HASH = 4;
    pub const DT_STRTAB = 5;
    pub const DT_SYMTAB = 6;
    pub const DT_RELA = 7;
    pub const DT_RELASZ = 8;
    pub const DT_RELAENT = 9;
    pub const DT_STRSZ = 10;
    pub const DT_SYMENT = 11;
    pub const DT_INIT = 12;
    pub const DT_FINI = 13;
    pub const DT_SONAME = 14;
    pub const DT_RPATH = 15;
    pub const DT_SYMBOLIC = 16;
    pub const DT_REL = 17;
    pub const DT_RELSZ = 18;
    pub const DT_RELENT = 19;
    pub const DT_PLTREL = 20;
    pub const DT_DEBUG = 21;
    pub const DT_TEXTREL = 22;
    pub const DT_JMPREL = 23;
    pub const DT_BIND_NOW = 24;
    pub const DT_INIT_ARRAY = 25;
    pub const DT_FINI_ARRAY = 26;
    pub const DT_INIT_ARRAYSZ = 27;
    pub const DT_FINI_ARRAYSZ = 28;
    pub const DT_RUNPATH = 29;
    pub const DT_FLAGS = 30;
    pub const DT_ENCODING = 32;
    pub const DT_PREINIT_ARRAY = 32;
    pub const DT_PREINIT_ARRAYSZ = 33;
    pub const DT_SYMTAB_SHNDX = 34;
    pub const DT_NUM = 35;
    pub const DT_LOOS = 0x6000000d;
    pub const DT_HIOS = 0x6ffff000;
    pub const DT_LOPROC = 0x70000000;
    pub const DT_HIPROC = 0x7fffffff;
    pub const DT_PROCNUM = DT_MIPS_NUM;

    pub const DT_VALRNGLO = 0x6ffffd00;
    pub const DT_GNU_PRELINKED = 0x6ffffdf5;
    pub const DT_GNU_CONFLICTSZ = 0x6ffffdf6;
    pub const DT_GNU_LIBLISTSZ = 0x6ffffdf7;
    pub const DT_CHECKSUM = 0x6ffffdf8;
    pub const DT_PLTPADSZ = 0x6ffffdf9;
    pub const DT_MOVEENT = 0x6ffffdfa;
    pub const DT_MOVESZ = 0x6ffffdfb;
    pub const DT_FEATURE_1 = 0x6ffffdfc;
    pub const DT_POSFLAG_1 = 0x6ffffdfd;

    pub const DT_SYMINSZ = 0x6ffffdfe;
    pub const DT_SYMINENT = 0x6ffffdff;
    pub const DT_VALRNGHI = 0x6ffffdff;
    pub const DT_VALNUM = 12;

    pub const DT_ADDRRNGLO = 0x6ffffe00;
    pub const DT_GNU_HASH = 0x6ffffef5;
    pub const DT_TLSDESC_PLT = 0x6ffffef6;
    pub const DT_TLSDESC_GOT = 0x6ffffef7;
    pub const DT_GNU_CONFLICT = 0x6ffffef8;
    pub const DT_GNU_LIBLIST = 0x6ffffef9;
    pub const DT_CONFIG = 0x6ffffefa;
    pub const DT_DEPAUDIT = 0x6ffffefb;
    pub const DT_AUDIT = 0x6ffffefc;
    pub const DT_PLTPAD = 0x6ffffefd;
    pub const DT_MOVETAB = 0x6ffffefe;
    pub const DT_SYMINFO = 0x6ffffeff;
    pub const DT_ADDRRNGHI = 0x6ffffeff;
    pub const DT_ADDRNUM = 11;

    pub const DT_VERSYM = 0x6ffffff0;

    pub const DT_RELACOUNT = 0x6ffffff9;
    pub const DT_RELCOUNT = 0x6ffffffa;

    pub const DT_FLAGS_1 = 0x6ffffffb;
    pub const DT_VERDEF = 0x6ffffffc;

    pub const DT_VERDEFNUM = 0x6ffffffd;
    pub const DT_VERNEED = 0x6ffffffe;

    pub const DT_VERNEEDNUM = 0x6fffffff;
    pub const DT_VERSIONTAGNUM = 16;

    pub const DT_AUXILIARY = 0x7ffffffd;
    pub const DT_FILTER = 0x7fffffff;
    pub const DT_EXTRANUM = 3;

    pub const DT_SPARC_REGISTER = 0x70000001;
    pub const DT_SPARC_NUM = 2;

    pub const DT_MIPS_RLD_VERSION = 0x70000001;
    pub const DT_MIPS_TIME_STAMP = 0x70000002;
    pub const DT_MIPS_ICHECKSUM = 0x70000003;
    pub const DT_MIPS_IVERSION = 0x70000004;
    pub const DT_MIPS_FLAGS = 0x70000005;
    pub const DT_MIPS_BASE_ADDRESS = 0x70000006;
    pub const DT_MIPS_MSYM = 0x70000007;
    pub const DT_MIPS_CONFLICT = 0x70000008;
    pub const DT_MIPS_LIBLIST = 0x70000009;
    pub const DT_MIPS_LOCAL_GOTNO = 0x7000000a;
    pub const DT_MIPS_CONFLICTNO = 0x7000000b;
    pub const DT_MIPS_LIBLISTNO = 0x70000010;
    pub const DT_MIPS_SYMTABNO = 0x70000011;
    pub const DT_MIPS_UNREFEXTNO = 0x70000012;
    pub const DT_MIPS_GOTSYM = 0x70000013;
    pub const DT_MIPS_HIPAGENO = 0x70000014;
    pub const DT_MIPS_RLD_MAP = 0x70000016;
    pub const DT_MIPS_DELTA_CLASS = 0x70000017;
    pub const DT_MIPS_DELTA_CLASS_NO = 0x70000018;

    pub const DT_MIPS_DELTA_INSTANCE = 0x70000019;
    pub const DT_MIPS_DELTA_INSTANCE_NO = 0x7000001a;

    pub const DT_MIPS_DELTA_RELOC = 0x7000001b;
    pub const DT_MIPS_DELTA_RELOC_NO = 0x7000001c;

    pub const DT_MIPS_DELTA_SYM = 0x7000001d;

    pub const DT_MIPS_DELTA_SYM_NO = 0x7000001e;

    pub const DT_MIPS_DELTA_CLASSSYM = 0x70000020;

    pub const DT_MIPS_DELTA_CLASSSYM_NO = 0x70000021;

    pub const DT_MIPS_CXX_FLAGS = 0x70000022;
    pub const DT_MIPS_PIXIE_INIT = 0x70000023;
    pub const DT_MIPS_SYMBOL_LIB = 0x70000024;
    pub const DT_MIPS_LOCALPAGE_GOTIDX = 0x70000025;
    pub const DT_MIPS_LOCAL_GOTIDX = 0x70000026;
    pub const DT_MIPS_HIDDEN_GOTIDX = 0x70000027;
    pub const DT_MIPS_PROTECTED_GOTIDX = 0x70000028;
    pub const DT_MIPS_OPTIONS = 0x70000029;
    pub const DT_MIPS_INTERFACE = 0x7000002a;
    pub const DT_MIPS_DYNSTR_ALIGN = 0x7000002b;
    pub const DT_MIPS_INTERFACE_SIZE = 0x7000002c;
    pub const DT_MIPS_RLD_TEXT_RESOLVE_ADDR = 0x7000002d;

    pub const DT_MIPS_PERF_SUFFIX = 0x7000002e;

    pub const DT_MIPS_COMPACT_SIZE = 0x7000002f;
    pub const DT_MIPS_GP_VALUE = 0x70000030;
    pub const DT_MIPS_AUX_DYNAMIC = 0x70000031;

    pub const DT_MIPS_PLTGOT = 0x70000032;

    pub const DT_MIPS_RWPLT = 0x70000034;
    pub const DT_MIPS_RLD_MAP_REL = 0x70000035;
    pub const DT_MIPS_NUM = 0x36;

    pub const DT_ALPHA_PLTRO = (DT_LOPROC + 0);
    pub const DT_ALPHA_NUM = 1;

    pub const DT_PPC_GOT = (DT_LOPROC + 0);
    pub const DT_PPC_OPT = (DT_LOPROC + 1);
    pub const DT_PPC_NUM = 2;

    pub const DT_PPC64_GLINK = (DT_LOPROC + 0);
    pub const DT_PPC64_OPD = (DT_LOPROC + 1);
    pub const DT_PPC64_OPDSZ = (DT_LOPROC + 2);
    pub const DT_PPC64_OPT = (DT_LOPROC + 3);
    pub const DT_PPC64_NUM = 4;

    pub const DT_IA_64_PLT_RESERVE = (DT_LOPROC + 0);
    pub const DT_IA_64_NUM = 1;

    pub const DT_NIOS2_GP = 0x70000002;

    pub const DF_ORIGIN = 0x00000001;
    pub const DF_SYMBOLIC = 0x00000002;
    pub const DF_TEXTREL = 0x00000004;
    pub const DF_BIND_NOW = 0x00000008;
    pub const DF_STATIC_TLS = 0x00000010;

    pub const DF_1_NOW = 0x00000001;
    pub const DF_1_GLOBAL = 0x00000002;
    pub const DF_1_GROUP = 0x00000004;
    pub const DF_1_NODELETE = 0x00000008;
    pub const DF_1_LOADFLTR = 0x00000010;
    pub const DF_1_INITFIRST = 0x00000020;
    pub const DF_1_NOOPEN = 0x00000040;
    pub const DF_1_ORIGIN = 0x00000080;
    pub const DF_1_DIRECT = 0x00000100;
    pub const DF_1_TRANS = 0x00000200;
    pub const DF_1_INTERPOSE = 0x00000400;
    pub const DF_1_NODEFLIB = 0x00000800;
    pub const DF_1_NODUMP = 0x00001000;
    pub const DF_1_CONFALT = 0x00002000;
    pub const DF_1_ENDFILTEE = 0x00004000;
    pub const DF_1_DISPRELDNE = 0x00008000;
    pub const DF_1_DISPRELPND = 0x00010000;
    pub const DF_1_NODIRECT = 0x00020000;
    pub const DF_1_IGNMULDEF = 0x00040000;
    pub const DF_1_NOKSYMS = 0x00080000;
    pub const DF_1_NOHDR = 0x00100000;
    pub const DF_1_EDITED = 0x00200000;
    pub const DF_1_NORELOC = 0x00400000;
    pub const DF_1_SYMINTPOSE = 0x00800000;
    pub const DF_1_GLOBAUDIT = 0x01000000;
    pub const DF_1_SINGLETON = 0x02000000;
    pub const DF_1_STUB = 0x04000000;
    pub const DF_1_PIE = 0x08000000;

    pub const VERSYM_HIDDEN = 0x8000;
    pub const VERSYM_VERSION = 0x7fff;

    /// Symbol is local
    pub const VER_NDX_LOCAL = 0;
    /// Symbol is global
    pub const VER_NDX_GLOBAL = 1;
    /// Beginning of reserved entries
    pub const VER_NDX_LORESERVE = 0xff00;
    /// Symbol is to be eliminated
    pub const VER_NDX_ELIMINATE = 0xff01;

    /// Version definition of the file itself
    pub const VER_FLG_BASE = 1;
    /// Weak version identifier
    pub const VER_FLG_WEAK = 2;

    /// Program header table entry unused
    pub const PT_NULL = 0;
    /// Loadable program segment
    pub const PT_LOAD = 1;
    /// Dynamic linking information
    pub const PT_DYNAMIC = 2;
    /// Program interpreter
    pub const PT_INTERP = 3;
    /// Auxiliary information
    pub const PT_NOTE = 4;
    /// Reserved
    pub const PT_SHLIB = 5;
    /// Entry for header table itself
    pub const PT_PHDR = 6;
    /// Thread-local storage segment
    pub const PT_TLS = 7;
    /// Number of defined types
    pub const PT_NUM = 8;
    /// Start of OS-specific
    pub const PT_LOOS = 0x60000000;
    /// GCC .eh_frame_hdr segment
    pub const PT_GNU_EH_FRAME = 0x6474e550;
    /// Indicates stack executability
    pub const PT_GNU_STACK = 0x6474e551;
    /// Read-only after relocation
    pub const PT_GNU_RELRO = 0x6474e552;
    pub const PT_LOSUNW = 0x6ffffffa;
    /// Sun specific segment
    pub const PT_SUNWBSS = 0x6ffffffa;
    /// Stack segment
    pub const PT_SUNWSTACK = 0x6ffffffb;
    pub const PT_HISUNW = 0x6fffffff;
    /// End of OS-specific
    pub const PT_HIOS = 0x6fffffff;
    /// Start of processor-specific
    pub const PT_LOPROC = 0x70000000;
    /// End of processor-specific
    pub const PT_HIPROC = 0x7fffffff;

    /// Section header table entry unused
    pub const SHT_NULL = 0;
    /// Program data
    pub const SHT_PROGBITS = 1;
    /// Symbol table
    pub const SHT_SYMTAB = 2;
    /// String table
    pub const SHT_STRTAB = 3;
    /// Relocation entries with addends
    pub const SHT_RELA = 4;
    /// Symbol hash table
    pub const SHT_HASH = 5;
    /// Dynamic linking information
    pub const SHT_DYNAMIC = 6;
    /// Notes
    pub const SHT_NOTE = 7;
    /// Program space with no data (bss)
    pub const SHT_NOBITS = 8;
    /// Relocation entries, no addends
    pub const SHT_REL = 9;
    /// Reserved
    pub const SHT_SHLIB = 10;
    /// Dynamic linker symbol table
    pub const SHT_DYNSYM = 11;
    /// Array of constructors
    pub const SHT_INIT_ARRAY = 14;
    /// Array of destructors
    pub const SHT_FINI_ARRAY = 15;
    /// Array of pre-constructors
    pub const SHT_PREINIT_ARRAY = 16;
    /// Section group
    pub const SHT_GROUP = 17;
    /// Extended section indices
    pub const SHT_SYMTAB_SHNDX = 18;
    /// Start of OS-specific
    pub const SHT_LOOS = 0x60000000;
    /// LLVM address-significance table
    pub const SHT_LLVM_ADDRSIG = 0x6fff4c03;
    /// GNU hash table
    pub const SHT_GNU_HASH = 0x6ffffff6;
    /// GNU version definition table
    pub const SHT_GNU_VERDEF = 0x6ffffffd;
    /// GNU needed versions table
    pub const SHT_GNU_VERNEED = 0x6ffffffe;
    /// GNU symbol version table
    pub const SHT_GNU_VERSYM = 0x6fffffff;
    /// End of OS-specific
    pub const SHT_HIOS = 0x6fffffff;
    /// Start of processor-specific
    pub const SHT_LOPROC = 0x70000000;
    /// Unwind information
    pub const SHT_X86_64_UNWIND = 0x70000001;
    /// End of processor-specific
    pub const SHT_HIPROC = 0x7fffffff;
    /// Start of application-specific
    pub const SHT_LOUSER = 0x80000000;
    /// End of application-specific
    pub const SHT_HIUSER = 0xffffffff;

    // Note type for .note.gnu.build_id

    pub const NT_GNU_BUILD_ID = 3;

    /// Local symbol
    pub const STB_LOCAL = 0;
    /// Global symbol
    pub const STB_GLOBAL = 1;
    /// Weak symbol
    pub const STB_WEAK = 2;
    /// Number of defined types
    pub const STB_NUM = 3;
    /// Start of OS-specific
    pub const STB_LOOS = 10;
    /// Unique symbol
    pub const STB_GNU_UNIQUE = 10;
    /// End of OS-specific
    pub const STB_HIOS = 12;
    /// Start of processor-specific
    pub const STB_LOPROC = 13;
    /// End of processor-specific
    pub const STB_HIPROC = 15;

    pub const STB_MIPS_SPLIT_COMMON = 13;

    /// Symbol type is unspecified
    pub const STT_NOTYPE = 0;
    /// Symbol is a data object
    pub const STT_OBJECT = 1;
    /// Symbol is a code object
    pub const STT_FUNC = 2;
    /// Symbol associated with a section
    pub const STT_SECTION = 3;
    /// Symbol's name is file name
    pub const STT_FILE = 4;
    /// Symbol is a common data object
    pub const STT_COMMON = 5;
    /// Symbol is thread-local data object
    pub const STT_TLS = 6;
    /// Number of defined types
    pub const STT_NUM = 7;
    /// Start of OS-specific
    pub const STT_LOOS = 10;
    /// Symbol is indirect code object
    pub const STT_GNU_IFUNC = 10;
    /// End of OS-specific
    pub const STT_HIOS = 12;
    /// Start of processor-specific
    pub const STT_LOPROC = 13;
    /// End of processor-specific
    pub const STT_HIPROC = 15;

    pub const STT_SPARC_REGISTER = 13;

    pub const STT_PARISC_MILLICODE = 13;

    pub const STT_HP_OPAQUE = (STT_LOOS + 0x1);
    pub const STT_HP_STUB = (STT_LOOS + 0x2);

    pub const STT_ARM_TFUNC = STT_LOPROC;
    pub const STT_ARM_16BIT = STT_HIPROC;

    pub const MAGIC = "\x7fELF";

    /// File types
    pub const ET = enum(u16) {
        /// No file type
        NONE = 0,

        /// Relocatable file
        REL = 1,

        /// Executable file
        EXEC = 2,

        /// Shared object file
        DYN = 3,

        /// Core file
        CORE = 4,

        /// Beginning of processor-specific codes
        pub const LOPROC = 0xff00;

        /// Processor-specific
        pub const HIPROC = 0xffff;
    };

    /// All integers are native endian.
    pub const Header = struct {
        endian: std.builtin.Endian,
        machine: EM,
        is_64: bool,
        entry: u64,
        phoff: u64,
        shoff: u64,
        phentsize: u16,
        phnum: u16,
        shentsize: u16,
        shnum: u16,
        shstrndx: u16,

        pub fn program_header_iterator(self: Header, parse_source: anytype) ProgramHeaderIterator(@TypeOf(parse_source)) {
            return ProgramHeaderIterator(@TypeOf(parse_source)){
                .elf_header = self,
                .parse_source = parse_source,
            };
        }

        pub fn section_header_iterator(self: Header, parse_source: anytype) SectionHeaderIterator(@TypeOf(parse_source)) {
            return SectionHeaderIterator(@TypeOf(parse_source)){
                .elf_header = self,
                .parse_source = parse_source,
            };
        }

        pub fn read(parse_source: anytype) !Header {
            var hdr_buf: [@sizeOf(Elf64_Ehdr)]u8 align(@alignOf(Elf64_Ehdr)) = undefined;
            try parse_source.seekableStream().seekTo(0);
            try parse_source.reader().readNoEof(&hdr_buf);
            return Header.parse(&hdr_buf);
        }

        pub fn parse(hdr_buf: *align(@alignOf(Elf64_Ehdr)) const [@sizeOf(Elf64_Ehdr)]u8) !Header {
            const hdr32 = @as(*const Elf32_Ehdr, @ptrCast(hdr_buf));
            const hdr64 = @as(*const Elf64_Ehdr, @ptrCast(hdr_buf));
            if (!mem.eql(u8, hdr32.e_ident[0..4], MAGIC)) return error.InvalidElfMagic;
            if (hdr32.e_ident[EI_VERSION] != 1) return error.InvalidElfVersion;

            const endian: std.builtin.Endian = switch (hdr32.e_ident[EI_DATA]) {
                ELFDATA2LSB => .Little,
                ELFDATA2MSB => .Big,
                else => return error.InvalidElfEndian,
            };
            const need_bswap = endian != native_endian;

            const is_64 = switch (hdr32.e_ident[EI_CLASS]) {
                ELFCLASS32 => false,
                ELFCLASS64 => true,
                else => return error.InvalidElfClass,
            };

            const machine = if (need_bswap) blk: {
                const value = @intFromEnum(hdr32.e_machine);
                break :blk @as(EM, @enumFromInt(@byteSwap(value)));
            } else hdr32.e_machine;

            return @as(Header, .{
                .endian = endian,
                .machine = machine,
                .is_64 = is_64,
                .entry = int(is_64, need_bswap, hdr32.e_entry, hdr64.e_entry),
                .phoff = int(is_64, need_bswap, hdr32.e_phoff, hdr64.e_phoff),
                .shoff = int(is_64, need_bswap, hdr32.e_shoff, hdr64.e_shoff),
                .phentsize = int(is_64, need_bswap, hdr32.e_phentsize, hdr64.e_phentsize),
                .phnum = int(is_64, need_bswap, hdr32.e_phnum, hdr64.e_phnum),
                .shentsize = int(is_64, need_bswap, hdr32.e_shentsize, hdr64.e_shentsize),
                .shnum = int(is_64, need_bswap, hdr32.e_shnum, hdr64.e_shnum),
                .shstrndx = int(is_64, need_bswap, hdr32.e_shstrndx, hdr64.e_shstrndx),
            });
        }
    };

    pub fn ProgramHeaderIterator(comptime ParseSource: anytype) type {
        return struct {
            elf_header: Header,
            parse_source: ParseSource,
            index: usize = 0,

            pub fn next(self: *@This()) !?Elf64_Phdr {
                if (self.index >= self.elf_header.phnum) return null;
                defer self.index += 1;

                if (self.elf_header.is_64) {
                    var phdr: Elf64_Phdr = undefined;
                    const offset = self.elf_header.phoff + @sizeOf(@TypeOf(phdr)) * self.index;
                    try self.parse_source.seekableStream().seekTo(offset);
                    try self.parse_source.reader().readNoEof(mem.asBytes(&phdr));

                    // ELF endianness matches native endianness.

                    if (self.elf_header.endian == native_endian) return phdr;

                    // Convert fields to native endianness.

                    mem.byteSwapAllFields(Elf64_Phdr, &phdr);
                    return phdr;
                }

                var phdr: Elf32_Phdr = undefined;
                const offset = self.elf_header.phoff + @sizeOf(@TypeOf(phdr)) * self.index;
                try self.parse_source.seekableStream().seekTo(offset);
                try self.parse_source.reader().readNoEof(mem.asBytes(&phdr));

                // ELF endianness does NOT match native endianness.

                if (self.elf_header.endian != native_endian) {
                    // Convert fields to native endianness.

                    mem.byteSwapAllFields(Elf32_Phdr, &phdr);
                }

                // Convert 32-bit header to 64-bit.

                return Elf64_Phdr{
                    .p_type = phdr.p_type,
                    .p_offset = phdr.p_offset,
                    .p_vaddr = phdr.p_vaddr,
                    .p_paddr = phdr.p_paddr,
                    .p_filesz = phdr.p_filesz,
                    .p_memsz = phdr.p_memsz,
                    .p_flags = phdr.p_flags,
                    .p_align = phdr.p_align,
                };
            }
        };
    }

    pub fn SectionHeaderIterator(comptime ParseSource: anytype) type {
        return struct {
            elf_header: Header,
            parse_source: ParseSource,
            index: usize = 0,

            pub fn next(self: *@This()) !?Elf64_Shdr {
                if (self.index >= self.elf_header.shnum) return null;
                defer self.index += 1;

                if (self.elf_header.is_64) {
                    var shdr: Elf64_Shdr = undefined;
                    const offset = self.elf_header.shoff + @sizeOf(@TypeOf(shdr)) * self.index;
                    try self.parse_source.seekableStream().seekTo(offset);
                    try self.parse_source.reader().readNoEof(mem.asBytes(&shdr));

                    // ELF endianness matches native endianness.

                    if (self.elf_header.endian == native_endian) return shdr;

                    // Convert fields to native endianness.

                    mem.byteSwapAllFields(Elf64_Shdr, &shdr);
                    return shdr;
                }

                var shdr: Elf32_Shdr = undefined;
                const offset = self.elf_header.shoff + @sizeOf(@TypeOf(shdr)) * self.index;
                try self.parse_source.seekableStream().seekTo(offset);
                try self.parse_source.reader().readNoEof(mem.asBytes(&shdr));

                // ELF endianness does NOT match native endianness.

                if (self.elf_header.endian != native_endian) {
                    // Convert fields to native endianness.

                    mem.byteSwapAllFields(Elf32_Shdr, &shdr);
                }

                // Convert 32-bit header to 64-bit.

                return Elf64_Shdr{
                    .sh_name = shdr.sh_name,
                    .sh_type = shdr.sh_type,
                    .sh_flags = shdr.sh_flags,
                    .sh_addr = shdr.sh_addr,
                    .sh_offset = shdr.sh_offset,
                    .sh_size = shdr.sh_size,
                    .sh_link = shdr.sh_link,
                    .sh_info = shdr.sh_info,
                    .sh_addralign = shdr.sh_addralign,
                    .sh_entsize = shdr.sh_entsize,
                };
            }
        };
    }

    pub fn int(is_64: bool, need_bswap: bool, int_32: anytype, int_64: anytype) @TypeOf(int_64) {
        if (is_64) {
            if (need_bswap) {
                return @byteSwap(int_64);
            } else {
                return int_64;
            }
        } else {
            return int32(need_bswap, int_32, @TypeOf(int_64));
        }
    }

    pub fn int32(need_bswap: bool, int_32: anytype, comptime Int64: anytype) Int64 {
        if (need_bswap) {
            return @byteSwap(int_32);
        } else {
            return int_32;
        }
    }

    pub const EI_NIDENT = 16;

    pub const EI_CLASS = 4;
    pub const ELFCLASSNONE = 0;
    pub const ELFCLASS32 = 1;
    pub const ELFCLASS64 = 2;
    pub const ELFCLASSNUM = 3;

    pub const EI_DATA = 5;
    pub const ELFDATANONE = 0;
    pub const ELFDATA2LSB = 1;
    pub const ELFDATA2MSB = 2;
    pub const ELFDATANUM = 3;

    pub const EI_VERSION = 6;

    pub const Elf32_Half = u16;
    pub const Elf64_Half = u16;
    pub const Elf32_Word = u32;
    pub const Elf32_Sword = i32;
    pub const Elf64_Word = u32;
    pub const Elf64_Sword = i32;
    pub const Elf32_Xword = u64;
    pub const Elf32_Sxword = i64;
    pub const Elf64_Xword = u64;
    pub const Elf64_Sxword = i64;
    pub const Elf32_Addr = u32;
    pub const Elf64_Addr = u64;
    pub const Elf32_Off = u32;
    pub const Elf64_Off = u64;
    pub const Elf32_Section = u16;
    pub const Elf64_Section = u16;
    pub const Elf32_Versym = Elf32_Half;
    pub const Elf64_Versym = Elf64_Half;
    pub const Elf32_Ehdr = extern struct {
        e_ident: [EI_NIDENT]u8,
        e_type: ET,
        e_machine: EM,
        e_version: Elf32_Word,
        e_entry: Elf32_Addr,
        e_phoff: Elf32_Off,
        e_shoff: Elf32_Off,
        e_flags: Elf32_Word,
        e_ehsize: Elf32_Half,
        e_phentsize: Elf32_Half,
        e_phnum: Elf32_Half,
        e_shentsize: Elf32_Half,
        e_shnum: Elf32_Half,
        e_shstrndx: Elf32_Half,
    };
    pub const Elf64_Ehdr = extern struct {
        e_ident: [EI_NIDENT]u8,
        e_type: ET,
        e_machine: EM,
        e_version: Elf64_Word,
        e_entry: Elf64_Addr,
        e_phoff: Elf64_Off,
        e_shoff: Elf64_Off,
        e_flags: Elf64_Word,
        e_ehsize: Elf64_Half,
        e_phentsize: Elf64_Half,
        e_phnum: Elf64_Half,
        e_shentsize: Elf64_Half,
        e_shnum: Elf64_Half,
        e_shstrndx: Elf64_Half,
    };
    pub const Elf32_Phdr = extern struct {
        p_type: Elf32_Word,
        p_offset: Elf32_Off,
        p_vaddr: Elf32_Addr,
        p_paddr: Elf32_Addr,
        p_filesz: Elf32_Word,
        p_memsz: Elf32_Word,
        p_flags: Elf32_Word,
        p_align: Elf32_Word,
    };
    pub const Elf64_Phdr = extern struct {
        p_type: Elf64_Word,
        p_flags: Elf64_Word,
        p_offset: Elf64_Off,
        p_vaddr: Elf64_Addr,
        p_paddr: Elf64_Addr,
        p_filesz: Elf64_Xword,
        p_memsz: Elf64_Xword,
        p_align: Elf64_Xword,
    };
    pub const Elf32_Shdr = extern struct {
        sh_name: Elf32_Word,
        sh_type: Elf32_Word,
        sh_flags: Elf32_Word,
        sh_addr: Elf32_Addr,
        sh_offset: Elf32_Off,
        sh_size: Elf32_Word,
        sh_link: Elf32_Word,
        sh_info: Elf32_Word,
        sh_addralign: Elf32_Word,
        sh_entsize: Elf32_Word,
    };
    pub const Elf64_Shdr = extern struct {
        sh_name: Elf64_Word,
        sh_type: Elf64_Word,
        sh_flags: Elf64_Xword,
        sh_addr: Elf64_Addr,
        sh_offset: Elf64_Off,
        sh_size: Elf64_Xword,
        sh_link: Elf64_Word,
        sh_info: Elf64_Word,
        sh_addralign: Elf64_Xword,
        sh_entsize: Elf64_Xword,
    };
    pub const Elf32_Chdr = extern struct {
        ch_type: COMPRESS,
        ch_size: Elf32_Word,
        ch_addralign: Elf32_Word,
    };
    pub const Elf64_Chdr = extern struct {
        ch_type: COMPRESS,
        ch_reserved: Elf64_Word = 0,
        ch_size: Elf64_Xword,
        ch_addralign: Elf64_Xword,
    };
    pub const Elf32_Sym = extern struct {
        st_name: Elf32_Word,
        st_value: Elf32_Addr,
        st_size: Elf32_Word,
        st_info: u8,
        st_other: u8,
        st_shndx: Elf32_Section,

        pub inline fn st_type(self: @This()) u4 {
            return @as(u4, @truncate(self.st_info));
        }
        pub inline fn st_bind(self: @This()) u4 {
            return @as(u4, @truncate(self.st_info >> 4));
        }
    };
    pub const Elf64_Sym = extern struct {
        st_name: Elf64_Word,
        st_info: u8,
        st_other: u8,
        st_shndx: Elf64_Section,
        st_value: Elf64_Addr,
        st_size: Elf64_Xword,

        pub inline fn st_type(self: @This()) u4 {
            return @as(u4, @truncate(self.st_info));
        }
        pub inline fn st_bind(self: @This()) u4 {
            return @as(u4, @truncate(self.st_info >> 4));
        }
    };
    pub const Elf32_Syminfo = extern struct {
        si_boundto: Elf32_Half,
        si_flags: Elf32_Half,
    };
    pub const Elf64_Syminfo = extern struct {
        si_boundto: Elf64_Half,
        si_flags: Elf64_Half,
    };
    pub const Elf32_Rel = extern struct {
        r_offset: Elf32_Addr,
        r_info: Elf32_Word,

        pub inline fn r_sym(self: @This()) u24 {
            return @as(u24, @truncate(self.r_info >> 8));
        }
        pub inline fn r_type(self: @This()) u8 {
            return @as(u8, @truncate(self.r_info));
        }
    };
    pub const Elf64_Rel = extern struct {
        r_offset: Elf64_Addr,
        r_info: Elf64_Xword,

        pub inline fn r_sym(self: @This()) u32 {
            return @as(u32, @truncate(self.r_info >> 32));
        }
        pub inline fn r_type(self: @This()) u32 {
            return @as(u32, @truncate(self.r_info));
        }
    };
    pub const Elf32_Rela = extern struct {
        r_offset: Elf32_Addr,
        r_info: Elf32_Word,
        r_addend: Elf32_Sword,

        pub inline fn r_sym(self: @This()) u24 {
            return @as(u24, @truncate(self.r_info >> 8));
        }
        pub inline fn r_type(self: @This()) u8 {
            return @as(u8, @truncate(self.r_info));
        }
    };
    pub const Elf64_Rela = extern struct {
        r_offset: Elf64_Addr,
        r_info: Elf64_Xword,
        r_addend: Elf64_Sxword,

        pub inline fn r_sym(self: @This()) u32 {
            return @as(u32, @truncate(self.r_info >> 32));
        }
        pub inline fn r_type(self: @This()) u32 {
            return @as(u32, @truncate(self.r_info));
        }
    };
    pub const Elf32_Dyn = extern struct {
        d_tag: Elf32_Sword,
        d_val: Elf32_Addr,
    };
    pub const Elf64_Dyn = extern struct {
        d_tag: Elf64_Sxword,
        d_val: Elf64_Addr,
    };
    pub const Elf32_Verdef = extern struct {
        vd_version: Elf32_Half,
        vd_flags: Elf32_Half,
        vd_ndx: Elf32_Half,
        vd_cnt: Elf32_Half,
        vd_hash: Elf32_Word,
        vd_aux: Elf32_Word,
        vd_next: Elf32_Word,
    };
    pub const Elf64_Verdef = extern struct {
        vd_version: Elf64_Half,
        vd_flags: Elf64_Half,
        vd_ndx: Elf64_Half,
        vd_cnt: Elf64_Half,
        vd_hash: Elf64_Word,
        vd_aux: Elf64_Word,
        vd_next: Elf64_Word,
    };
    pub const Elf32_Verdaux = extern struct {
        vda_name: Elf32_Word,
        vda_next: Elf32_Word,
    };
    pub const Elf64_Verdaux = extern struct {
        vda_name: Elf64_Word,
        vda_next: Elf64_Word,
    };
    pub const Elf32_Verneed = extern struct {
        vn_version: Elf32_Half,
        vn_cnt: Elf32_Half,
        vn_file: Elf32_Word,
        vn_aux: Elf32_Word,
        vn_next: Elf32_Word,
    };
    pub const Elf64_Verneed = extern struct {
        vn_version: Elf64_Half,
        vn_cnt: Elf64_Half,
        vn_file: Elf64_Word,
        vn_aux: Elf64_Word,
        vn_next: Elf64_Word,
    };
    pub const Elf32_Vernaux = extern struct {
        vna_hash: Elf32_Word,
        vna_flags: Elf32_Half,
        vna_other: Elf32_Half,
        vna_name: Elf32_Word,
        vna_next: Elf32_Word,
    };
    pub const Elf64_Vernaux = extern struct {
        vna_hash: Elf64_Word,
        vna_flags: Elf64_Half,
        vna_other: Elf64_Half,
        vna_name: Elf64_Word,
        vna_next: Elf64_Word,
    };
    pub const Elf32_auxv_t = extern struct {
        a_type: u32,
        a_un: extern union {
            a_val: u32,
        },
    };
    pub const Elf64_auxv_t = extern struct {
        a_type: u64,
        a_un: extern union {
            a_val: u64,
        },
    };
    pub const Elf32_Nhdr = extern struct {
        n_namesz: Elf32_Word,
        n_descsz: Elf32_Word,
        n_type: Elf32_Word,
    };
    pub const Elf64_Nhdr = extern struct {
        n_namesz: Elf64_Word,
        n_descsz: Elf64_Word,
        n_type: Elf64_Word,
    };
    pub const Elf32_Move = extern struct {
        m_value: Elf32_Xword,
        m_info: Elf32_Word,
        m_poffset: Elf32_Word,
        m_repeat: Elf32_Half,
        m_stride: Elf32_Half,
    };
    pub const Elf64_Move = extern struct {
        m_value: Elf64_Xword,
        m_info: Elf64_Xword,
        m_poffset: Elf64_Xword,
        m_repeat: Elf64_Half,
        m_stride: Elf64_Half,
    };
    pub const Elf32_gptab = extern union {
        gt_header: extern struct {
            gt_current_g_value: Elf32_Word,
            gt_unused: Elf32_Word,
        },
        gt_entry: extern struct {
            gt_g_value: Elf32_Word,
            gt_bytes: Elf32_Word,
        },
    };
    pub const Elf32_RegInfo = extern struct {
        ri_gprmask: Elf32_Word,
        ri_cprmask: [4]Elf32_Word,
        ri_gp_value: Elf32_Sword,
    };
    pub const Elf_Options = extern struct {
        kind: u8,
        size: u8,
        section: Elf32_Section,
        info: Elf32_Word,
    };
    pub const Elf_Options_Hw = extern struct {
        hwp_flags1: Elf32_Word,
        hwp_flags2: Elf32_Word,
    };
    pub const Elf32_Lib = extern struct {
        l_name: Elf32_Word,
        l_time_stamp: Elf32_Word,
        l_checksum: Elf32_Word,
        l_version: Elf32_Word,
        l_flags: Elf32_Word,
    };
    pub const Elf64_Lib = extern struct {
        l_name: Elf64_Word,
        l_time_stamp: Elf64_Word,
        l_checksum: Elf64_Word,
        l_version: Elf64_Word,
        l_flags: Elf64_Word,
    };
    pub const Elf32_Conflict = Elf32_Addr;
    pub const Elf_MIPS_ABIFlags_v0 = extern struct {
        version: Elf32_Half,
        isa_level: u8,
        isa_rev: u8,
        gpr_size: u8,
        cpr1_size: u8,
        cpr2_size: u8,
        fp_abi: u8,
        isa_ext: Elf32_Word,
        ases: Elf32_Word,
        flags1: Elf32_Word,
        flags2: Elf32_Word,
    };

    comptime {
        assert(@sizeOf(Elf32_Ehdr) == 52);
        assert(@sizeOf(Elf64_Ehdr) == 64);

        assert(@sizeOf(Elf32_Phdr) == 32);
        assert(@sizeOf(Elf64_Phdr) == 56);

        assert(@sizeOf(Elf32_Shdr) == 40);
        assert(@sizeOf(Elf64_Shdr) == 64);
    }

    pub const Auxv = switch (@sizeOf(usize)) {
        4 => Elf32_auxv_t,
        8 => Elf64_auxv_t,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Ehdr = switch (@sizeOf(usize)) {
        4 => Elf32_Ehdr,
        8 => Elf64_Ehdr,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Phdr = switch (@sizeOf(usize)) {
        4 => Elf32_Phdr,
        8 => Elf64_Phdr,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Dyn = switch (@sizeOf(usize)) {
        4 => Elf32_Dyn,
        8 => Elf64_Dyn,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Rel = switch (@sizeOf(usize)) {
        4 => Elf32_Rel,
        8 => Elf64_Rel,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Rela = switch (@sizeOf(usize)) {
        4 => Elf32_Rela,
        8 => Elf64_Rela,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Shdr = switch (@sizeOf(usize)) {
        4 => Elf32_Shdr,
        8 => Elf64_Shdr,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Chdr = switch (@sizeOf(usize)) {
        4 => Elf32_Chdr,
        8 => Elf64_Chdr,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Sym = switch (@sizeOf(usize)) {
        4 => Elf32_Sym,
        8 => Elf64_Sym,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Verdef = switch (@sizeOf(usize)) {
        4 => Elf32_Verdef,
        8 => Elf64_Verdef,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Verdaux = switch (@sizeOf(usize)) {
        4 => Elf32_Verdaux,
        8 => Elf64_Verdaux,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Addr = switch (@sizeOf(usize)) {
        4 => Elf32_Addr,
        8 => Elf64_Addr,
        else => @compileError("expected pointer size of 32 or 64"),
    };
    pub const Half = switch (@sizeOf(usize)) {
        4 => Elf32_Half,
        8 => Elf64_Half,
        else => @compileError("expected pointer size of 32 or 64"),
    };

    /// Machine architectures.
    ///
    /// See current registered ELF machine architectures at:
    /// http://www.sco.com/developers/gabi/latest/ch4.eheader.html
    pub const EM = enum(u16) {
        /// No machine
        NONE = 0,

        /// AT&T WE 32100
        M32 = 1,

        /// SPARC
        SPARC = 2,

        /// Intel 386
        @"386" = 3,

        /// Motorola 68000
        @"68K" = 4,

        /// Motorola 88000
        @"88K" = 5,

        /// Intel MCU
        IAMCU = 6,

        /// Intel 80860
        @"860" = 7,

        /// MIPS R3000
        MIPS = 8,

        /// IBM System/370
        S370 = 9,

        /// MIPS RS3000 Little-endian
        MIPS_RS3_LE = 10,

        /// SPU Mark II
        SPU_2 = 13,

        /// Hewlett-Packard PA-RISC
        PARISC = 15,

        /// Fujitsu VPP500
        VPP500 = 17,

        /// Enhanced instruction set SPARC
        SPARC32PLUS = 18,

        /// Intel 80960
        @"960" = 19,

        /// PowerPC
        PPC = 20,

        /// PowerPC64
        PPC64 = 21,

        /// IBM System/390
        S390 = 22,

        /// IBM SPU/SPC
        SPU = 23,

        /// NEC V800
        V800 = 36,

        /// Fujitsu FR20
        FR20 = 37,

        /// TRW RH-32
        RH32 = 38,

        /// Motorola RCE
        RCE = 39,

        /// ARM
        ARM = 40,

        /// DEC Alpha
        ALPHA = 41,

        /// Hitachi SH
        SH = 42,

        /// SPARC V9
        SPARCV9 = 43,

        /// Siemens TriCore
        TRICORE = 44,

        /// Argonaut RISC Core
        ARC = 45,

        /// Hitachi H8/300
        H8_300 = 46,

        /// Hitachi H8/300H
        H8_300H = 47,

        /// Hitachi H8S
        H8S = 48,

        /// Hitachi H8/500
        H8_500 = 49,

        /// Intel IA-64 processor architecture
        IA_64 = 50,

        /// Stanford MIPS-X
        MIPS_X = 51,

        /// Motorola ColdFire
        COLDFIRE = 52,

        /// Motorola M68HC12
        @"68HC12" = 53,

        /// Fujitsu MMA Multimedia Accelerator
        MMA = 54,

        /// Siemens PCP
        PCP = 55,

        /// Sony nCPU embedded RISC processor
        NCPU = 56,

        /// Denso NDR1 microprocessor
        NDR1 = 57,

        /// Motorola Star*Core processor
        STARCORE = 58,

        /// Toyota ME16 processor
        ME16 = 59,

        /// STMicroelectronics ST100 processor
        ST100 = 60,

        /// Advanced Logic Corp. TinyJ embedded processor family
        TINYJ = 61,

        /// AMD x86-64 architecture
        X86_64 = 62,

        /// Sony DSP Processor
        PDSP = 63,

        /// Digital Equipment Corp. PDP-10
        PDP10 = 64,

        /// Digital Equipment Corp. PDP-11
        PDP11 = 65,

        /// Siemens FX66 microcontroller
        FX66 = 66,

        /// STMicroelectronics ST9+ 8/16 bit microcontroller
        ST9PLUS = 67,

        /// STMicroelectronics ST7 8-bit microcontroller
        ST7 = 68,

        /// Motorola MC68HC16 Microcontroller
        @"68HC16" = 69,

        /// Motorola MC68HC11 Microcontroller
        @"68HC11" = 70,

        /// Motorola MC68HC08 Microcontroller
        @"68HC08" = 71,

        /// Motorola MC68HC05 Microcontroller
        @"68HC05" = 72,

        /// Silicon Graphics SVx
        SVX = 73,

        /// STMicroelectronics ST19 8-bit microcontroller
        ST19 = 74,

        /// Digital VAX
        VAX = 75,

        /// Axis Communications 32-bit embedded processor
        CRIS = 76,

        /// Infineon Technologies 32-bit embedded processor
        JAVELIN = 77,

        /// Element 14 64-bit DSP Processor
        FIREPATH = 78,

        /// LSI Logic 16-bit DSP Processor
        ZSP = 79,

        /// Donald Knuth's educational 64-bit processor
        MMIX = 80,

        /// Harvard University machine-independent object files
        HUANY = 81,

        /// SiTera Prism
        PRISM = 82,

        /// Atmel AVR 8-bit microcontroller
        AVR = 83,

        /// Fujitsu FR30
        FR30 = 84,

        /// Mitsubishi D10V
        D10V = 85,

        /// Mitsubishi D30V
        D30V = 86,

        /// NEC v850
        V850 = 87,

        /// Mitsubishi M32R
        M32R = 88,

        /// Matsushita MN10300
        MN10300 = 89,

        /// Matsushita MN10200
        MN10200 = 90,

        /// picoJava
        PJ = 91,

        /// OpenRISC 32-bit embedded processor
        OPENRISC = 92,

        /// ARC International ARCompact processor (old spelling/synonym: EM_ARC_A5)
        ARC_COMPACT = 93,

        /// Tensilica Xtensa Architecture
        XTENSA = 94,

        /// Alphamosaic VideoCore processor
        VIDEOCORE = 95,

        /// Thompson Multimedia General Purpose Processor
        TMM_GPP = 96,

        /// National Semiconductor 32000 series
        NS32K = 97,

        /// Tenor Network TPC processor
        TPC = 98,

        /// Trebia SNP 1000 processor
        SNP1K = 99,

        /// STMicroelectronics (www.st.com) ST200
        ST200 = 100,

        /// Ubicom IP2xxx microcontroller family
        IP2K = 101,

        /// MAX Processor
        MAX = 102,

        /// National Semiconductor CompactRISC microprocessor
        CR = 103,

        /// Fujitsu F2MC16
        F2MC16 = 104,

        /// Texas Instruments embedded microcontroller msp430
        MSP430 = 105,

        /// Analog Devices Blackfin (DSP) processor
        BLACKFIN = 106,

        /// S1C33 Family of Seiko Epson processors
        SE_C33 = 107,

        /// Sharp embedded microprocessor
        SEP = 108,

        /// Arca RISC Microprocessor
        ARCA = 109,

        /// Microprocessor series from PKU-Unity Ltd. and MPRC of Peking University
        UNICORE = 110,

        /// eXcess: 16/32/64-bit configurable embedded CPU
        EXCESS = 111,

        /// Icera Semiconductor Inc. Deep Execution Processor
        DXP = 112,

        /// Altera Nios II soft-core processor
        ALTERA_NIOS2 = 113,

        /// National Semiconductor CompactRISC CRX
        CRX = 114,

        /// Motorola XGATE embedded processor
        XGATE = 115,

        /// Infineon C16x/XC16x processor
        C166 = 116,

        /// Renesas M16C series microprocessors
        M16C = 117,

        /// Microchip Technology dsPIC30F Digital Signal Controller
        DSPIC30F = 118,

        /// Freescale Communication Engine RISC core
        CE = 119,

        /// Renesas M32C series microprocessors
        M32C = 120,

        /// Altium TSK3000 core
        TSK3000 = 131,

        /// Freescale RS08 embedded processor
        RS08 = 132,

        /// Analog Devices SHARC family of 32-bit DSP processors
        SHARC = 133,

        /// Cyan Technology eCOG2 microprocessor
        ECOG2 = 134,

        /// Sunplus S+core7 RISC processor
        SCORE7 = 135,

        /// New Japan Radio (NJR) 24-bit DSP Processor
        DSP24 = 136,

        /// Broadcom VideoCore III processor
        VIDEOCORE3 = 137,

        /// RISC processor for Lattice FPGA architecture
        LATTICEMICO32 = 138,

        /// Seiko Epson C17 family
        SE_C17 = 139,

        /// The Texas Instruments TMS320C6000 DSP family
        TI_C6000 = 140,

        /// The Texas Instruments TMS320C2000 DSP family
        TI_C2000 = 141,

        /// The Texas Instruments TMS320C55x DSP family
        TI_C5500 = 142,

        /// STMicroelectronics 64bit VLIW Data Signal Processor
        MMDSP_PLUS = 160,

        /// Cypress M8C microprocessor
        CYPRESS_M8C = 161,

        /// Renesas R32C series microprocessors
        R32C = 162,

        /// NXP Semiconductors TriMedia architecture family
        TRIMEDIA = 163,

        /// Qualcomm Hexagon processor
        HEXAGON = 164,

        /// Intel 8051 and variants
        @"8051" = 165,

        /// STMicroelectronics STxP7x family of configurable and extensible RISC processors
        STXP7X = 166,

        /// Andes Technology compact code size embedded RISC processor family
        NDS32 = 167,

        /// Cyan Technology eCOG1X family
        ECOG1X = 168,

        /// Dallas Semiconductor MAXQ30 Core Micro-controllers
        MAXQ30 = 169,

        /// New Japan Radio (NJR) 16-bit DSP Processor
        XIMO16 = 170,

        /// M2000 Reconfigurable RISC Microprocessor
        MANIK = 171,

        /// Cray Inc. NV2 vector architecture
        CRAYNV2 = 172,

        /// Renesas RX family
        RX = 173,

        /// Imagination Technologies META processor architecture
        METAG = 174,

        /// MCST Elbrus general purpose hardware architecture
        MCST_ELBRUS = 175,

        /// Cyan Technology eCOG16 family
        ECOG16 = 176,

        /// National Semiconductor CompactRISC CR16 16-bit microprocessor
        CR16 = 177,

        /// Freescale Extended Time Processing Unit
        ETPU = 178,

        /// Infineon Technologies SLE9X core
        SLE9X = 179,

        /// Intel L10M
        L10M = 180,

        /// Intel K10M
        K10M = 181,

        /// ARM AArch64
        AARCH64 = 183,

        /// Atmel Corporation 32-bit microprocessor family
        AVR32 = 185,

        /// STMicroeletronics STM8 8-bit microcontroller
        STM8 = 186,

        /// Tilera TILE64 multicore architecture family
        TILE64 = 187,

        /// Tilera TILEPro multicore architecture family
        TILEPRO = 188,

        /// NVIDIA CUDA architecture
        CUDA = 190,

        /// Tilera TILE-Gx multicore architecture family
        TILEGX = 191,

        /// CloudShield architecture family
        CLOUDSHIELD = 192,

        /// KIPO-KAIST Core-A 1st generation processor family
        COREA_1ST = 193,

        /// KIPO-KAIST Core-A 2nd generation processor family
        COREA_2ND = 194,

        /// Synopsys ARCompact V2
        ARC_COMPACT2 = 195,

        /// Open8 8-bit RISC soft processor core
        OPEN8 = 196,

        /// Renesas RL78 family
        RL78 = 197,

        /// Broadcom VideoCore V processor
        VIDEOCORE5 = 198,

        /// Renesas 78KOR family
        @"78KOR" = 199,

        /// Freescale 56800EX Digital Signal Controller (DSC)
        @"56800EX" = 200,

        /// Beyond BA1 CPU architecture
        BA1 = 201,

        /// Beyond BA2 CPU architecture
        BA2 = 202,

        /// XMOS xCORE processor family
        XCORE = 203,

        /// Microchip 8-bit PIC(r) family
        MCHP_PIC = 204,

        /// Reserved by Intel
        INTEL205 = 205,

        /// Reserved by Intel
        INTEL206 = 206,

        /// Reserved by Intel
        INTEL207 = 207,

        /// Reserved by Intel
        INTEL208 = 208,

        /// Reserved by Intel
        INTEL209 = 209,

        /// KM211 KM32 32-bit processor
        KM32 = 210,

        /// KM211 KMX32 32-bit processor
        KMX32 = 211,

        /// KM211 KMX16 16-bit processor
        KMX16 = 212,

        /// KM211 KMX8 8-bit processor
        KMX8 = 213,

        /// KM211 KVARC processor
        KVARC = 214,

        /// Paneve CDP architecture family
        CDP = 215,

        /// Cognitive Smart Memory Processor
        COGE = 216,

        /// iCelero CoolEngine
        COOL = 217,

        /// Nanoradio Optimized RISC
        NORC = 218,

        /// CSR Kalimba architecture family
        CSR_KALIMBA = 219,

        /// AMD GPU architecture
        AMDGPU = 224,

        /// RISC-V
        RISCV = 243,

        /// Lanai 32-bit processor
        LANAI = 244,

        /// Linux kernel bpf virtual machine
        BPF = 247,

        /// C-SKY
        CSKY = 252,

        /// Fujitsu FR-V
        FRV = 0x5441,

        _,

        pub fn toTargetCpuArch(em: EM) ?std.Target.Cpu.Arch {
            return switch (em) {
                .AVR => .avr,
                .MSP430 => .msp430,
                .ARC => .arc,
                .ARM => .arm,
                .HEXAGON => .hexagon,
                .@"68K" => .m68k,
                .MIPS => .mips,
                .MIPS_RS3_LE => .mipsel,
                .PPC => .powerpc,
                .SPARC => .sparc,
                .@"386" => .x86,
                .XCORE => .xcore,
                .CSR_KALIMBA => .kalimba,
                .LANAI => .lanai,
                .AARCH64 => .aarch64,
                .PPC64 => .powerpc64,
                .RISCV => .riscv64,
                .X86_64 => .x86_64,
                .BPF => .bpfel,
                .SPARCV9 => .sparc64,
                .S390 => .s390x,
                .SPU_2 => .spu_2,
                // there's many cases we don't (yet) handle, or will never have a

                // zig target cpu arch equivalent (such as null).

                else => null,
            };
        }
    };

    /// Section data should be writable during execution.
    pub const SHF_WRITE = 0x1;

    /// Section occupies memory during program execution.
    pub const SHF_ALLOC = 0x2;

    /// Section contains executable machine instructions.
    pub const SHF_EXECINSTR = 0x4;

    /// The data in this section may be merged.
    pub const SHF_MERGE = 0x10;

    /// The data in this section is null-terminated strings.
    pub const SHF_STRINGS = 0x20;

    /// A field in this section holds a section header table index.
    pub const SHF_INFO_LINK = 0x40;

    /// Adds special ordering requirements for link editors.
    pub const SHF_LINK_ORDER = 0x80;

    /// This section requires special OS-specific processing to avoid incorrect
    /// behavior.
    pub const SHF_OS_NONCONFORMING = 0x100;

    /// This section is a member of a section group.
    pub const SHF_GROUP = 0x200;

    /// This section holds Thread-Local Storage.
    pub const SHF_TLS = 0x400;

    /// Identifies a section containing compressed data.
    pub const SHF_COMPRESSED = 0x800;

    /// Not to be GCed by the linker
    pub const SHF_GNU_RETAIN = 0x200000;

    /// This section is excluded from the final executable or shared library.
    pub const SHF_EXCLUDE = 0x80000000;

    /// Start of target-specific flags.
    pub const SHF_MASKOS = 0x0ff00000;

    /// Bits indicating processor-specific flags.
    pub const SHF_MASKPROC = 0xf0000000;

    /// All sections with the "d" flag are grouped together by the linker to form
    /// the data section and the dp register is set to the start of the section by
    /// the boot code.
    pub const XCORE_SHF_DP_SECTION = 0x10000000;

    /// All sections with the "c" flag are grouped together by the linker to form
    /// the constant pool and the cp register is set to the start of the constant
    /// pool by the boot code.
    pub const XCORE_SHF_CP_SECTION = 0x20000000;

    /// If an object file section does not have this flag set, then it may not hold
    /// more than 2GB and can be freely referred to in objects using smaller code
    /// models. Otherwise, only objects using larger code models can refer to them.
    /// For example, a medium code model object can refer to data in a section that
    /// sets this flag besides being able to refer to data in a section that does
    /// not set it; likewise, a small code model object can refer only to code in a
    /// section that does not set this flag.
    pub const SHF_X86_64_LARGE = 0x10000000;

    /// All sections with the GPREL flag are grouped into a global data area
    /// for faster accesses
    pub const SHF_HEX_GPREL = 0x10000000;

    /// Section contains text/data which may be replicated in other sections.
    /// Linker must retain only one copy.
    pub const SHF_MIPS_NODUPES = 0x01000000;

    /// Linker must generate implicit hidden weak names.
    pub const SHF_MIPS_NAMES = 0x02000000;

    /// Section data local to process.
    pub const SHF_MIPS_LOCAL = 0x04000000;

    /// Do not strip this section.
    pub const SHF_MIPS_NOSTRIP = 0x08000000;

    /// Section must be part of global data area.
    pub const SHF_MIPS_GPREL = 0x10000000;

    /// This section should be merged.
    pub const SHF_MIPS_MERGE = 0x20000000;

    /// Address size to be inferred from section entry size.
    pub const SHF_MIPS_ADDR = 0x40000000;

    /// Section data is string data by default.
    pub const SHF_MIPS_STRING = 0x80000000;

    /// Make code section unreadable when in execute-only mode
    pub const SHF_ARM_PURECODE = 0x2000000;

    /// Execute
    pub const PF_X = 1;

    /// Write
    pub const PF_W = 2;

    /// Read
    pub const PF_R = 4;

    /// Bits for operating system-specific semantics.
    pub const PF_MASKOS = 0x0ff00000;

    /// Bits for processor-specific semantics.
    pub const PF_MASKPROC = 0xf0000000;

    /// Undefined section
    pub const SHN_UNDEF = 0;
    /// Start of reserved indices
    pub const SHN_LORESERVE = 0xff00;
    /// Start of processor-specific
    pub const SHN_LOPROC = 0xff00;
    /// End of processor-specific
    pub const SHN_HIPROC = 0xff1f;
    pub const SHN_LIVEPATCH = 0xff20;
    /// Associated symbol is absolute
    pub const SHN_ABS = 0xfff1;
    /// Associated symbol is common
    pub const SHN_COMMON = 0xfff2;
    /// End of reserved indices
    pub const SHN_HIRESERVE = 0xffff;

    // Legal values for ch_type (compression algorithm).

    pub const COMPRESS = enum(u32) {
        ZLIB = 1,
        ZSTD = 2,
        LOOS = 0x60000000,
        HIOS = 0x6fffffff,
        LOPROC = 0x70000000,
        HIPROC = 0x7fffffff,
        _,
    };

    /// AMD x86-64 relocations.
    /// No reloc
    pub const R_X86_64_NONE = 0;
    /// Direct 64 bit
    pub const R_X86_64_64 = 1;
    /// PC relative 32 bit signed
    pub const R_X86_64_PC32 = 2;
    /// 32 bit GOT entry
    pub const R_X86_64_GOT32 = 3;
    /// 32 bit PLT address
    pub const R_X86_64_PLT32 = 4;
    /// Copy symbol at runtime
    pub const R_X86_64_COPY = 5;
    /// Create GOT entry
    pub const R_X86_64_GLOB_DAT = 6;
    /// Create PLT entry
    pub const R_X86_64_JUMP_SLOT = 7;
    /// Adjust by program base
    pub const R_X86_64_RELATIVE = 8;
    /// 32 bit signed PC relative offset to GOT
    pub const R_X86_64_GOTPCREL = 9;
    /// Direct 32 bit zero extended
    pub const R_X86_64_32 = 10;
    /// Direct 32 bit sign extended
    pub const R_X86_64_32S = 11;
    /// Direct 16 bit zero extended
    pub const R_X86_64_16 = 12;
    /// 16 bit sign extended pc relative
    pub const R_X86_64_PC16 = 13;
    /// Direct 8 bit sign extended
    pub const R_X86_64_8 = 14;
    /// 8 bit sign extended pc relative
    pub const R_X86_64_PC8 = 15;
    /// ID of module containing symbol
    pub const R_X86_64_DTPMOD64 = 16;
    /// Offset in module's TLS block
    pub const R_X86_64_DTPOFF64 = 17;
    /// Offset in initial TLS block
    pub const R_X86_64_TPOFF64 = 18;
    /// 32 bit signed PC relative offset to two GOT entries for GD symbol
    pub const R_X86_64_TLSGD = 19;
    /// 32 bit signed PC relative offset to two GOT entries for LD symbol
    pub const R_X86_64_TLSLD = 20;
    /// Offset in TLS block
    pub const R_X86_64_DTPOFF32 = 21;
    /// 32 bit signed PC relative offset to GOT entry for IE symbol
    pub const R_X86_64_GOTTPOFF = 22;
    /// Offset in initial TLS block
    pub const R_X86_64_TPOFF32 = 23;
    /// PC relative 64 bit
    pub const R_X86_64_PC64 = 24;
    /// 64 bit offset to GOT
    pub const R_X86_64_GOTOFF64 = 25;
    /// 32 bit signed pc relative offset to GOT
    pub const R_X86_64_GOTPC32 = 26;
    /// 64 bit GOT entry offset
    pub const R_X86_64_GOT64 = 27;
    /// 64 bit PC relative offset to GOT entry
    pub const R_X86_64_GOTPCREL64 = 28;
    /// 64 bit PC relative offset to GOT
    pub const R_X86_64_GOTPC64 = 29;
    /// Like GOT64, says PLT entry needed
    pub const R_X86_64_GOTPLT64 = 30;
    /// 64-bit GOT relative offset to PLT entry
    pub const R_X86_64_PLTOFF64 = 31;
    /// Size of symbol plus 32-bit addend
    pub const R_X86_64_SIZE32 = 32;
    /// Size of symbol plus 64-bit addend
    pub const R_X86_64_SIZE64 = 33;
    /// GOT offset for TLS descriptor
    pub const R_X86_64_GOTPC32_TLSDESC = 34;
    /// Marker for call through TLS descriptor
    pub const R_X86_64_TLSDESC_CALL = 35;
    /// TLS descriptor
    pub const R_X86_64_TLSDESC = 36;
    /// Adjust indirectly by program base
    pub const R_X86_64_IRELATIVE = 37;
    /// 64-bit adjust by program base
    pub const R_X86_64_RELATIVE64 = 38;
    /// 39 Reserved was R_X86_64_PC32_BND
    /// 40 Reserved was R_X86_64_PLT32_BND
    /// Load from 32 bit signed pc relative offset to GOT entry without REX prefix, relaxable
    pub const R_X86_64_GOTPCRELX = 41;
    /// Load from 32 bit signed PC relative offset to GOT entry with REX prefix, relaxable
    pub const R_X86_64_REX_GOTPCRELX = 42;
    pub const R_X86_64_NUM = 43;

    pub const STV = enum(u2) {
        DEFAULT = 0,
        INTERNAL = 1,
        HIDDEN = 2,
        PROTECTED = 3,
    };