CVEXEFMT.H
/*** cvexefmt.h - format of CodeView information in exe
*
* Structures, constants, etc. for reading CodeView information
* from the executable.
*
*/
/*** The master copy of this file resides in the CodeView project.
* All Microsoft projects are required to use the master copy without
* modification. Modification of the master version or a copy
* without consultation with all parties concerned is extremely
* risky.
*
*/
// The following structures and constants describe the format of the
// CodeView Debug OMF for that will be accepted by CodeView 4.0 and
// later. These are executables with signatures of NB05, NB06 and NB07.
// There is some confusion about the signatures NB03 and NB04 so none
// of the utilites will accept executables with these signatures.
// All of the structures described below must start on a long word boundary
// to maintain natural alignment. Pad space can be inserted during the
// write operation and the addresses adjusted without affecting the contents
// of the structures.
// Type of subsection entry.
#define sstModule 0x120
#define sstTypes 0x121
#define sstPublic 0x122
#define sstPublicSym 0x123 // publics as symbol (waiting for link)
#define sstSymbols 0x124
#define sstAlignSym 0x125
#define sstSrcLnSeg 0x126 // because link doesn't emit SrcModule
#define sstSrcModule 0x127
#define sstLibraries 0x128
#define sstGlobalSym 0x129
#define sstGlobalPub 0x12a
#define sstGlobalTypes 0x12b
#define sstMPC 0x12c
#define sstSegMap 0x12d
#define sstSegName 0x12e
#define sstPreComp 0x12f // precompiled types
#define sstPreCompMap 0x130 // map precompiled types in global types
#define sstOffsetMap16 0x131
#define sstOffsetMap32 0x132
#define sstFileIndex 0x133
#define sstStaticSym 0x134
typedef enum OMFHash {
OMFHASH_NONE, // no hashing
OMFHASH_SUMUC16, // upper case sum of chars in 16 bit table
OMFHASH_SUMUC32, // upper case sum of chars in 32 bit table
OMFHASH_ADDR16, // sorted by increasing address in 16 bit table
OMFHASH_ADDR32 // sorted by increasing address in 32 bit table
} OMFHASH;
// CodeView Debug OMF signature. The signature at the end of the file is
// a negative offset from the end of the file to another signature. At
// the negative offset (base address) is another signature whose filepos
// field points to the first OMFDirHeader in a chain of directories.
// The NB05 signature is used by the link utility to indicated a completely
// unpacked file. The NB06 signature is used by ilink to indicate that the
// executable has had CodeView information from an incremental link appended
// to the executable. The NB07 signature is used by cvpack to indicate that
// the CodeView Debug OMF has been packed. CodeView will only process
// executables with the NB07 signature.
typedef struct OMFSignature {
char Signature[4]; // "NB05", "NB06" or "NB07"
long filepos; // offset in file
} OMFSignature;
// directory information structure
// This structure contains the information describing the directory.
// It is pointed to by the signature at the base address or the directory
// link field of a preceeding directory. The directory entries immediately
// follow this structure.
typedef struct OMFDirHeader {
unsigned short cbDirHeader; // length of this structure
unsigned short cbDirEntry; // number of bytes in each directory entry
unsigned long cDir; // number of directorie entries
long lfoNextDir; // offset from base of next directory
unsigned long flags; // status flags
} OMFDirHeader;
// directory structure
// The data in this structure is used to reference the data for each
// subsection of the CodeView Debug OMF information. Tables that are
// not associated with a specific module will have a module index of
// oxffff. These tables are the global types table, the global symbol
// table, the global public table and the library table.
typedef struct OMFDirEntry {
unsigned short SubSection; // subsection type (sst...)
unsigned short iMod; // module index
long lfo; // large file offset of subsection
unsigned long cb; // number of bytes in subsection
} OMFDirEntry;
// information decribing each segment in a module
typedef struct OMFSegDesc {
unsigned short Seg; // segment index
unsigned short pad; // pad to maintain alignment
unsigned long Off; // offset of code in segment
unsigned long cbSeg; // number of bytes in segment
} OMFSegDesc;
// per module information
// There is one of these subsection entries for each module
// in the executable. The entry is generated by link/ilink.
// This table will probably require padding because of the
// variable length module name.
typedef struct OMFModule {
unsigned short ovlNumber; // overlay number
unsigned short iLib; // library that the module was linked from
unsigned short cSeg; // count of number of segments in module
char Style[2]; // debugging style "CV"
OMFSegDesc SegInfo[1]; // describes segments in module
char Name[]; // length prefixed module name padded to
// long word boundary
} OMFModule;
// Symbol hash table format
// This structure immediately preceeds the global publics table
// and global symbol tables.
typedef struct OMFSymHash {
unsigned short symhash; // symbol hash function index
unsigned short addrhash; // address hash function index
unsigned long cbSymbol; // length of symbol information
unsigned long cbHSym; // length of symbol hash data
unsigned long cbHAddr; // length of address hashdata
} OMFSymHash;
// Global types subsection format
// This structure immediately preceeds the global types table.
// The offsets in the typeOffset array are relative to the address
// of ctypes. Each type entry following the typeOffset array must
// begin on a long word boundary.
typedef struct OMFTypeFlags {
unsigned long sig :8;
unsigned long unused :24;
} OMFTypeFlags;
typedef struct OMFGlobalTypes {
OMFTypeFlags flags;
unsigned long cTypes; // number of types
unsigned long typeOffset[]; // array of offsets to types
} OMFGlobalTypes;
// Precompiled types mapping table
// This table should be ignored by all consumers except the incremental
// packer.
typedef struct OMFPreCompMap {
unsigned short FirstType; // first precompiled type index
unsigned short cTypes; // number of precompiled types
unsigned long signature; // precompiled types signature
unsigned short pad;
CV_typ_t map[]; // mapping of precompiled types
} OMFPreCompMap;
// Source line to address mapping table.
// This table is generated by the link/ilink utility from line number
// information contained in the object file OMF data. This table contains
// only the code contribution for one segment from one source file.
typedef struct OMFSourceLine {
unsigned short Seg; // linker segment index
unsigned short cLnOff; // count of line/offset pairs
unsigned long offset[1]; // array of offsets in segment
unsigned short lineNbr[1]; // array of line lumber in source
} OMFSourceLine;
typedef OMFSourceLine FAR * LPSL;
// Source file description
// This table is generated by the linker
typedef struct OMFSourceFile {
unsigned short cSeg; // number of segments from source file
unsigned short reserved; // reserved
unsigned long baseSrcLn[1]; // base of OMFSourceLine tables
// this array is followed by array
// of segment start/end pairs followed by
// an array of linker indices
// for each segment in the file
unsigned short cFName; // length of source file name
char Name; // name of file padded to long boundary
} OMFSourceFile;
typedef OMFSourceFile FAR * LPSF;
// Source line to address mapping header structure
// This structure describes the number and location of the
// OMFAddrLine tables for a module. The offSrcLine entries are
// relative to the beginning of this structure.
typedef struct OMFSourceModule {
unsigned short cFile; // number of OMFSourceTables
unsigned short cSeg; // number of segments in module
unsigned long baseSrcFile[1]; // base of OMFSourceFile table
// this array is followed by array
// of segment start/end pairs followed
// by an array of linker indices
// for each segment in the module
} OMFSourceModule;
typedef OMFSourceModule FAR * LPSM;
// sstLibraries
typedef struct OMFLibrary {
unsigned char cbLibs; // count of library names
char Libs[1]; // array of length prefixed lib names (first entry zero length)
} OMFLibrary;
// Pcode support. This subsection contains debug information generated
// by the MPC utility used to process Pcode executables. Currently
// it contains a mapping table from segment index (zero based) to
// frame paragraph. MPC converts segmented exe's to non-segmented
// exe's for DOS support. To avoid backpatching all CV info, this
// table is provided for the mapping. Additional info may be provided
// in the future for profiler support.
typedef struct OMFMpcDebugInfo {
unsigned short cSeg; // number of segments in module
unsigned short mpSegFrame[1]; // map seg (zero based) to frame
} OMFMpcDebugInfo;
// The following structures and constants describe the format of the
// CodeView Debug OMF for linkers that emit executables with the NB02
// signature. Current utilities with the exception of cvpack and cvdump
// will not accept or emit executables with the NB02 signature. Cvdump
// will dump an unpacked executable with the NB02 signature. Cvpack will
// read an executable with the NB02 signature but the packed executable
// will be written with the table format, contents and signature of NB07.
// subsection type constants
#define SSTMODULE 0x101 // Basic info. about object module
#define SSTPUBLIC 0x102 // Public symbols
#define SSTTYPES 0x103 // Type information
#define SSTSYMBOLS 0x104 // Symbol Data
#define SSTSRCLINES 0x105 // Source line information
#define SSTLIBRARIES 0x106 // Names of all library files used
#define SSTIMPORTS 0x107 // Symbols for DLL fixups
#define SSTCOMPACTED 0x108 // Compacted types section
#define SSTSRCLNSEG 0x109 // Same as source lines, contains segment
typedef struct DirEntry{
unsigned short SubSectionType;
unsigned short ModuleIndex;
long lfoStart;
unsigned short Size;
} DirEntry;
// information decribing each segment in a module
typedef struct oldnsg {
unsigned short Seg; // segment index
unsigned short Off; // offset of code in segment
unsigned short cbSeg; // number of bytes in segment
} oldnsg;
// old subsection module information
typedef struct oldsmd {
oldnsg SegInfo; // describes first segment in module
unsigned short ovlNbr; // overlay number
unsigned short iLib;
unsigned char cSeg; // Number of segments in module
char reserved;
unsigned char cbName[1]; // length prefixed name of module
oldnsg arnsg[]; // cSeg-1 structures exist for alloc text or comdat code
} oldsmd;
typedef struct{
unsigned short Seg;
unsigned long Off;
unsigned long cbSeg;
} oldnsg32;
typedef struct {
oldnsg32 SegInfo; // describes first segment in module
unsigned short ovlNbr; // overlay number
unsigned short iLib;
unsigned char cSeg; // Number of segments in module
char reserved;
unsigned char cbName[1]; // length prefixed name of module
oldnsg32 arnsg[]; // cSeg-1 structures exist for alloc text or comdat code
} oldsmd32;