mscoff.h

/* Microsoft COFF object file format */

#include <time.h>
#include <stdint.h>

#ifdef _MSC_VER
#pragma pack(push,1)
#elif defined(__DMC__)
#pragma ZTC align 1
#endif

/***********************************************/

struct BIGOBJ_HEADER
{
    uint16_t Sig1;                 // IMAGE_FILE_MACHINE_UNKNOWN
    uint16_t Sig2;                 // 0xFFFF
    uint16_t Version;              // 2
    uint16_t Machine;              // identifies type of target machine
    uint32_t TimeDateStamp;        // creation date, number of seconds since 1970
    uint8_t  UUID[16];             //  { '\xc7', '\xa1', '\xba', '\xd1', '\xee', '\xba', '\xa9', '\x4b',
                                   //    '\xaf', '\x20', '\xfa', '\xf6', '\x6a', '\xa4', '\xdc', '\xb8' };
    uint32_t unused[4];            // { 0, 0, 0, 0 }
    uint32_t NumberOfSections;     // number of sections
    uint32_t PointerToSymbolTable; // file offset of symbol table
    uint32_t NumberOfSymbols;      // number of entries in the symbol table
};

enum
{
    IMAGE_FILE_MACHINE_UNKNOWN            = 0,           // applies to any machine type
    IMAGE_FILE_MACHINE_I386               = 0x14C,       // x86
    IMAGE_FILE_MACHINE_AMD64              = 0x8664,      // x86_64

    IMAGE_FILE_RELOCS_STRIPPED            = 1,
    IMAGE_FILE_EXECUTABLE_IMAGE           = 2,
    IMAGE_FILE_LINE_NUMS_STRIPPED         = 4,
    IMAGE_FILE_LOCAL_SYMS_STRIPPED        = 8,
    IMAGE_FILE_AGGRESSIVE_WS_TRIM         = 0x10,
    IMAGE_FILE_LARGE_ADDRESS_AWARE        = 0x20,
    IMAGE_FILE_BYTES_REVERSED_LO          = 0x80,
    IMAGE_FILE_32BIT_MACHINE              = 0x100,
    IMAGE_FILE_DEBUG_STRIPPED             = 0x200,
    IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP    = 0x400,
    IMAGE_FILE_NET_RUN_FROM_SWAP          = 0x800,
    IMAGE_FILE_SYSTEM                     = 0x1000,
    IMAGE_FILE_DLL                        = 0x2000,
    IMAGE_FILE_UP_SYSTEM_ONLY             = 0x4000,
    IMAGE_FILE_BYTES_REVERSED_HI          = 0x8000,
};

struct IMAGE_FILE_HEADER
{
    uint16_t Machine;
    uint16_t NumberOfSections;
    uint32_t TimeDateStamp;
    uint32_t PointerToSymbolTable;
    uint32_t NumberOfSymbols;
    uint16_t SizeOfOptionalHeader;
    uint16_t Characteristics;
};

/***********************************************/

#define IMAGE_SIZEOF_SHORT_NAME 8

struct IMAGE_SECTION_HEADER
{
    uint8_t Name[IMAGE_SIZEOF_SHORT_NAME];
    uint32_t VirtualSize;
    uint32_t VirtualAddress;
    uint32_t SizeOfRawData;
    uint32_t PointerToRawData;
    uint32_t PointerToRelocations;
    uint32_t PointerToLinenumbers;
    uint16_t NumberOfRelocations;
    uint16_t NumberOfLinenumbers;
    uint32_t Characteristics;
};

enum
{
    IMAGE_SCN_TYPE_NO_PAD           = 8,       // obsolete
    IMAGE_SCN_CNT_CODE              = 0x20,    // code section
    IMAGE_SCN_CNT_INITIALIZED_DATA  = 0x40,
    IMAGE_SCN_CNT_UNINITIALIZED_DATA = 0x80,
    IMAGE_SCN_LNK_OTHER             = 0x100,
    IMAGE_SCN_LNK_INFO              = 0x200,   // comments; for .drectve section
    IMAGE_SCN_LNK_REMOVE            = 0x800,   // do not put in image file
    IMAGE_SCN_LNK_COMDAT            = 0x1000,  // COMDAT section
    IMAGE_SCN_GPREL                 = 0x8000,  // data referenced through global pointer GP
    IMAGE_SCN_MEM_PURGEABLE         = 0x20000,
    IMAGE_SCN_MEM_16BIT             = 0x20000,
    IMAGE_SCN_MEM_LOCKED            = 0x40000,
    IMAGE_SCN_MEM_PRELOAD           = 0x80000,
    IMAGE_SCN_ALIGN_1BYTES          = 0x100000,
    IMAGE_SCN_ALIGN_2BYTES          = 0x200000,
    IMAGE_SCN_ALIGN_4BYTES          = 0x300000,
    IMAGE_SCN_ALIGN_8BYTES          = 0x400000,
    IMAGE_SCN_ALIGN_16BYTES         = 0x500000,
    IMAGE_SCN_ALIGN_32BYTES         = 0x600000,
    IMAGE_SCN_ALIGN_64BYTES         = 0x700000,
    IMAGE_SCN_ALIGN_128BYTES        = 0x800000,
    IMAGE_SCN_ALIGN_256BYTES        = 0x900000,
    IMAGE_SCN_ALIGN_512BYTES        = 0xA00000,
    IMAGE_SCN_ALIGN_1024BYTES       = 0xB00000,
    IMAGE_SCN_ALIGN_2048BYTES       = 0xC00000,
    IMAGE_SCN_ALIGN_4096BYTES       = 0xD00000,
    IMAGE_SCN_ALIGN_8192BYTES       = 0xE00000,
    IMAGE_SCN_LNK_NRELOC_OVFL       = 0x1000000,     // more than 0xFFFF relocations
    IMAGE_SCN_MEM_DISCARDABLE       = 0x2000000,     // can be discarded
    IMAGE_SCN_MEM_NOT_CACHED        = 0x4000000,     // cannot be cached
    IMAGE_SCN_MEM_NOT_PAGED         = 0x8000000,     // cannot be paged
    IMAGE_SCN_MEM_SHARED            = 0x10000000,    // can be shared
    IMAGE_SCN_MEM_EXECUTE           = 0x20000000,    // executable code
    IMAGE_SCN_MEM_READ              = 0x40000000,    // readable
    IMAGE_SCN_MEM_WRITE             = 0x80000000,    // writeable
};

/***********************************************/

#define SYMNMLEN        8

enum
{
    IMAGE_SYM_DEBUG                 = -2,
    IMAGE_SYM_ABSOLUTE              = -1,
    IMAGE_SYM_UNDEFINED             = 0,

/* Values for n_sclass  */
    IMAGE_SYM_CLASS_EXTERNAL        = 2,
    IMAGE_SYM_CLASS_STATIC          = 3,
    IMAGE_SYM_CLASS_LABEL           = 6,
    IMAGE_SYM_CLASS_FUNCTION        = 101,
    IMAGE_SYM_CLASS_FILE            = 103,
};

struct SymbolTable32
{
    union
    {
        uint8_t Name[SYMNMLEN];
        struct
        {
            uint32_t Zeros;
            uint32_t Offset;
        };
    };
    uint32_t Value;
    int32_t SectionNumber;
    uint16_t Type;
    uint8_t StorageClass;
    uint8_t NumberOfAuxSymbols;
};

struct SymbolTable
{
    uint8_t Name[SYMNMLEN];
    uint32_t Value;
    int16_t SectionNumber;
    uint16_t Type;
    uint8_t StorageClass;
    uint8_t NumberOfAuxSymbols;
};

/***********************************************/

struct reloc
{
#pragma pack(1)
    unsigned r_vaddr;           // file offset of relocation
    unsigned r_symndx;          // symbol table index
    unsigned short r_type;      // IMAGE_REL_XXX kind of relocation to be performed
#pragma pack()
};

enum
{
    IMAGE_REL_AMD64_ABSOLUTE        = 0,
    IMAGE_REL_AMD64_ADDR64          = 1,
    IMAGE_REL_AMD64_ADDR32          = 2,
    IMAGE_REL_AMD64_ADDR32NB        = 3,
    IMAGE_REL_AMD64_REL32           = 4,
    IMAGE_REL_AMD64_REL32_1         = 5,
    IMAGE_REL_AMD64_REL32_2         = 6,
    IMAGE_REL_AMD64_REL32_3         = 7,
    IMAGE_REL_AMD64_REL32_4         = 8,
    IMAGE_REL_AMD64_REL32_5         = 9,
    IMAGE_REL_AMD64_SECTION         = 0xA,
    IMAGE_REL_AMD64_SECREL          = 0xB,
    IMAGE_REL_AMD64_SECREL7         = 0xC,
    IMAGE_REL_AMD64_TOKEN           = 0xD,
    IMAGE_REL_AMD64_SREL32          = 0xE,
    IMAGE_REL_AMD64_PAIR            = 0xF,
    IMAGE_REL_AMD64_SSPAN32         = 0x10,

    IMAGE_REL_I386_ABSOLUTE         = 0,
    IMAGE_REL_I386_DIR16            = 1,
    IMAGE_REL_I386_REL16            = 2,
    IMAGE_REL_I386_DIR32            = 6,
    IMAGE_REL_I386_DIR32NB          = 7,
    IMAGE_REL_I386_SEG12            = 9,
    IMAGE_REL_I386_SECTION          = 0xA,
    IMAGE_REL_I386_SECREL           = 0xB,
    IMAGE_REL_I386_TOKEN            = 0xC,
    IMAGE_REL_I386_SECREL7          = 0xD,
    IMAGE_REL_I386_REL32            = 0x14,
};

/***********************************************/

struct lineno
{
    union
    {
        unsigned l_symndx;
        unsigned l_paddr;
    } l_addr;
    unsigned short l_lnno;
};


/***********************************************/

#pragma pack(1)
union auxent
{
    // Function definitions
    struct
    {   unsigned TagIndex;
        unsigned TotalSize;
        unsigned PointerToLinenumber;
        unsigned PointerToNextFunction;
        unsigned short Zeros;
    } x_fd;

    // .bf symbols
    struct
    {
        unsigned Unused;
        unsigned short Linenumber;
        char filler[6];
        unsigned PointerToNextFunction;
        unsigned short Zeros;
    } x_bf;

    // .ef symbols
    struct
    {   unsigned Unused;
        unsigned short Linenumber;
        unsigned short Zeros;
    } x_ef;

    // Weak externals
    struct
    {   unsigned TagIndex;
        unsigned Characteristics;
        unsigned short Zeros;
#define IMAGE_WEAK_EXTERN_SEARCH_NOLIBRARY
#define IMAGE_WEAK_EXTERN_SEARCH_LIBRARY
#define IMAGE_WEAK_EXTERN_SEARCH_ALIAS
    } x_weak;

    // Section definitions
    struct
    {
        unsigned length;
        unsigned short NumberOfRelocations;
        unsigned short NumberOfLinenumbers;
        unsigned CheckSum;
        unsigned short NumberLowPart;
        unsigned char Selection;
        unsigned char Unused;
        unsigned short NumberHighPart;
        unsigned short Zeros;
    } x_section;

    char filler[18];
};
#pragma pack()

// auxent.x_section.Zeros
enum
{
    IMAGE_COMDAT_SELECT_NODUPLICATES        = 1,
    IMAGE_COMDAT_SELECT_ANY                 = 2,
    IMAGE_COMDAT_SELECT_SAME_SIZE           = 3,
    IMAGE_COMDAT_SELECT_EXACT_MATCH         = 4,
    IMAGE_COMDAT_SELECT_ASSOCIATIVE         = 5,
    IMAGE_COMDAT_SELECT_LARGEST             = 6,
};

/***********************************************/

#ifdef _MSC_VER
#pragma pack(pop)
#elif defined(__DMC__)
#pragma ZTC align
#endif