le.h

/*****************************************************************************
;*                                                                           *
;*    This structure define format of LE header for OS/2,Windows exe files   *
;*       ----------------------------------------------------------          *
;*                                                                           *
;*    Author Trigub Serge. B&M&T Corp.                                       *
;*           10 January 1993                                                 *
;*                                                                           *
;*****************************************************************************/

enum CPU_Type {
  i80286 = 0x01,
  i80386 = 0x02,
  i80486 = 0x03,
  i80586 = 0x04,
  i860_N10 = 0x20,
  i860_N11 = 0x21,
  MIPS_Mark_I = 0x40,
  MIPS_Mark_II = 0x41,
  MIPS_Mark_III = 0x42
};

struct Module_Type_Flags {
  unsigned long Module_Is_DLL : 1;
  unsigned long Reserved1 : 1;
  unsigned long Errors_In_Module : 1;
  unsigned long Reserved2 : 1;
  unsigned long Code_Load_Application : 1;
  unsigned long Application_Type : 3;

  unsigned long Reserved3 : 2;
  unsigned long No_External_FIXUP : 1;
  unsigned long No_Internal_FIXUP : 1;
  unsigned long Protected_Mode_Only : 1;
  unsigned long Global_Initialization : 1;
  unsigned long Multipledata : 1;
  unsigned long Singledata : 1;
};

struct LE_Header {
  unsigned char Signature[2]; // Signature 'LE' for exe header
  unsigned char Byte_Order;
  unsigned char Word_Order;
  unsigned long Exec_Format_Level;
  unsigned short CPU_Type;
  unsigned short Target_OS;
  unsigned long Module_Version;
  union {
    unsigned long Type_Flags;
    Module_Type_Flags Flags;
  };
  unsigned long Number_Of_Memory_Pages;
  unsigned long Initial_CS;
  unsigned long Initial_EI;
  unsigned long Initial_SS;
  unsigned long Initial_ESP;
  unsigned long Memory_Page_Size;
  unsigned long Bytes_On_Last_Page;
  unsigned long Fixup_Section_Size;
  unsigned long Fixup_Section_Checksum;
  unsigned long Loader_Section_Size;
  unsigned long Loader_Section_CheckSum;
  unsigned long Object_Table_Offset;
  unsigned long Object_Table_Entries;
  unsigned long Object_Page_Map_Table_Offset;
  unsigned long Object_Iterate_Data_Map_Offset;
  unsigned long Resource_Table_Offset;
  unsigned long Resource_Table_Entries;
  unsigned long Resident_Names_Table_Offset;
  unsigned long Entry_Table_Offset;
  unsigned long Module_Directives_Table_Offset;
  unsigned long Module_Directives_Table_Entries;
  unsigned long Fixup_Page_Table_Offset;
  unsigned long Fixup_Record_Table_Offset;
  unsigned long Imported_Module_Names_Table_Offset;
  unsigned long Imported_Modules_Count;
  unsigned long Imported_Procedure_Name_Table_Offset;
  unsigned long Per_page_Checksum_Table_Offset;
  unsigned long Data_Pages_Offset;
  unsigned long Preload_Page_Count;
  unsigned long Nonresident_Names_Table_Offset;
  unsigned long Nonresident_Names_Table_Length;
  unsigned long Nonresident_Names_Table_Checksum;
  unsigned long Automatic_Data_Object;
  unsigned long Debug_Information_Offset;
  unsigned long Debug_Information_Length;
  unsigned long Preload_Instance_Pages_Number;
  unsigned long Demand_Instance_Pages_Number;
  unsigned long Extra_Heap_Allocation;
  unsigned long Unknown[1];
};

struct OBJ_FLAGS {
  unsigned long I_O_Privilage_Level : 1;
  unsigned long Conforming_Segment : 1;
  unsigned long BIG_Segment : 1;
  unsigned long Alias_16_16 : 1;
  unsigned long Reserved : 1;
  unsigned long Resident_Long_Locable : 1;
  unsigned long Segment_Type : 2;
  unsigned long Segment_Invalid : 1;
  unsigned long Segment_Preloaded : 1;
  unsigned long Segment_Shared : 1;
  unsigned long Segment_Discardable : 1;
  unsigned long Segment_Resource : 1;
  unsigned long Segment_Executable : 1;
  unsigned long Segment_Writable : 1;
  unsigned long Segment_Readable : 1;
};

struct Object_Table {
  unsigned long Virtual_Segment_Size;
  unsigned long Relocation_Base_Address;
  union {
    unsigned long ObjTableFlags;
    OBJ_FLAGS FLAGS;
  };
  unsigned long Page_MAP_Index;
  unsigned long Page_MAP_Entries;
  unsigned long Reserved;
};

enum {
  Segment_Type_Normal,
  Segment_Zero_Filled,
  Segment_Resident,
  Segment_Resident_contiguous
};

struct PM_FLAGS {
  unsigned char Page_Type : 2;
  unsigned char Reserved : 6;
  unsigned char End_Page : 2;
};

struct Page_Map_Table {
  unsigned short High_Page_Number;
  unsigned char Low_Page_Number;
  //	union{
  //		PM_FLAGS SFLAGS;
  unsigned char FLAGS;
  //	};
};

enum { // LE_PM_FLG_Page_Type_Enum        ENUM    {
  Legal_Page = 0,
  Iterated_Page = 1,
  Invalid_Page = 2,
  Zero_Filled_Page = 3
};

struct Entry_Table {
  unsigned char Number_of_Entries;
  unsigned char Bungle_Flags;
  unsigned short Object_Index;
  // LE_Entry_First_Entry            equ     $
};

struct Entry {
  unsigned char Entry_Flags;
  union {
    unsigned short Word_Offset;
    unsigned long Dword_Offset;
  };
};

struct Entry_Bungle_Flags {
  unsigned char Bits_Entry : 1;
  unsigned char Valid_Entry : 1;
};

struct Fixup_Record_Table {
  unsigned char Relocation_Address_Type;
  unsigned char Relocation_Type;
  unsigned short Relocation_Page_Offset;
  unsigned char Segment_or_Module_Index;
  unsigned short Offset_Or_Ordinal_Value;
};

struct Rel_Addr_Type {
  unsigned char Repeat_Offset : 1;
  unsigned char Target_OFFSET_Absent : 1;
  unsigned char Type : 4;
};

enum // LE_Relocation_Address_Type_ENUM
{ RA_Low_Byte = 0,
  RA_16_bits_selector = 2,
  RA_32_bits_Far_Pointer = 3,
  RA_16_bits_Offset = 5,
  RA_48_bits_Far_Pointer = 6,
  RA_32_bits_Offset = 7,
  RA_32_bits_EIP_Rel = 8 };

struct Reloc_Type {
  unsigned char Ordinal_Byte : 1;
  unsigned char Reserv1 : 1;
  unsigned char ABS_Dword : 1;
  unsigned char Target_Offset_32 : 1;
  unsigned char Reserv2 : 1;
  unsigned char ADDITIVE_Type : 1;
  unsigned char Type : 2;
};

enum // LE_Relocation_Type_ENUM
{ Internal_Reference = 0,
  Imported_Ordinal = 1,
  Imported_Name = 2,
  OS_FIXUP = 3 };