en:docs:tk:formats:newexe

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Offset Size Name Description
00h WORD e_magic 0x4d, 0x5a. This is the “magic number” of an EXE file. The first byte of the file is 0x4d and the second is 0x5a.
02h WORD e_cblp The number of bytes in the last block of the program that are actually used. If this value is zero, that means the entire last block is used (i.e. the effective value is 512).
04h WORD e_cp Number of blocks in the file that are part of the EXE file. If [02-03] is non-zero, only that much of the last block is used.
06h WORD e_crlc Number of relocation entries stored after the header. May be zero.
08h WORD e_cparhdr Number of paragraphs in the header. The program's data begins just after the header, and this field can be used to calculate the appropriate file offset. The header includes the relocation entries. Note that some OSs and/or programs may fail if the header is not a multiple of 512 bytes.
0Ah WORD e_minalloc Number of paragraphs of additional memory that the program will need. This is the equivalent of the BSS size in a Unix program. The program can't be loaded if there isn't at least this much memory available to it.
0Ch WORD e_maxalloc Maximum number of paragraphs of additional memory. Normally, the OS reserves all the remaining conventional memory for your program, but you can limit it with this field.
0EH WORD e_ss Relative value of the stack segment. This value is added to the segment the program was loaded at, and the result is used to initialize the SS register.
10h WORD e_sp Initial value of the SP register.
12h WORD e_csum Word checksum. If set properly, the 16-bit sum of all words in the file should be zero. Usually, this isn't filled in.
14h WORD e_ip Initial value of the IP register.
16h WORD e_cs Initial value of the CS register, relative to the segment the program was loaded at.
18h WORD e_lfarlc Offset of the first relocation item in the file.
1Ah WORD e_ovno Overlay number. Normally zero, meaning that it's the main program.
1Ch WORD e_res[ERES1WDS]
WORD e_oemid
WORD e_oeminfo
WORD e_res2[ERES2WDS]
DWORD e_lfanew

/* In-disk and In-memory module structure. See 'Windows Internals' p. 219 */

struct new_exe {

  WORD  ne_magic;					/* Signature word EMAGIC */
union {
	struct {
		BYTE   ne_ver;			/* Version number of the linker */
		BYTE   ne_rev;			/* Revision number of the linker */
	};
	WORD  count;				/* Usage count (ne_ver/ne_rev on disk) */
};
  WORD  ne_enttab;				/* Entry Table file offset, relative to the beginning of
								   the segmented EXE header */
union {
	WORD  ne_cbenttab;			/* Number of bytes in the entry table */
	WORD  next;					/* Selector to next module */
};
union {
	DWORD            ne_crc;	/* 32-bit CRC of entire contents of file.
								   These words are taken as 00 during the calculation */
	struct {
		WORD	dgroup_entry;	/* Near ptr to segment entry for DGROUP */
		WORD	fileinfo;		/* Near ptr to file info (OFSTRUCT)*/
	};
};
  WORD  ne_flags;					/* Flag word */
  WORD  ne_autodata;				/* Segment number of automatic data segment.
								   This value is set to zero if SINGLEDATA and
								   MULTIPLEDATA flag bits are clear, NOAUTODATA is
								   indicated in the flags word.
								   A Segment number is an index into the module's segment
								   table. The first entry in the segment table is segment
								   number 1 */
  WORD  ne_heap;					/* Initial size, in bytes, of dynamic heap added to the
								   data segment. This value is zero if no initial local
								   heap is allocated */
  WORD  ne_stack;					/* Initial size, in bytes, of stack added to the data
								   segment. This value is zero to indicate no initial
								   stack allocation, or when SS is not equal to DS */
  DWORD            ne_csip;		/* Segment number:offset of CS:IP */
DWORD            ne_sssp;		/* Segment number:offset of SS:SP.
								   If SS equals the automatic data segment and SP equals
								   zero, the stack pointer is set to the top of the
								   automatic data segment just below the additional heap
								   area.
								   +--------------------------+
								   | additional dynamic heap  |
								   +--------------------------+ <- SP
								   |    additional stack      |
								   +--------------------------+
								   | loaded auto data segment |
								   +--------------------------+ <- DS, SS */
  WORD  ne_cseg;					/* Number of entries in the Segment Table */
  WORD  ne_cmod;					/* Number of entries in the Module Reference Table */
  WORD  ne_cbnrestab;				/* Number of bytes in the Non-Resident Name Table */
  WORD  ne_segtab;				/* Segment Table file offset, relative to the beginning
								   of the segmented EXE header */
  WORD  ne_rsrctab;				/* Resource Table file offset, relative to the beginning
								   of the segmented EXE header */
WORD  ne_restab;				/* Resident Name Table file offset, relative to the
								   beginning of the segmented EXE header */
  WORD  ne_modtab;				/* Module Reference Table file offset, relative to the
								   beginning of the segmented EXE header */
  WORD  ne_imptab;				/* Imported Names Table file offset, relative to the
								   beginning of the segmented EXE header */
  DWORD	ne_nrestab;				/* Non-Resident Name Table offset, relative to the
								   beginning of the file */
  WORD	ne_cmovent;				/* Number of movable entries in the Entry Table */
  WORD	ne_align;				/* Logical sector alignment shift count, log(base 2) of
								   the segment sector size (default 9) */
  WORD	ne_cres;				/* Number of resource entries */
  BYTE	ne_exetyp;				/* Executable type, used by loader.
								   02h = WINDOWS */
  BYTE	ne_flagsothers;			/* Operating system flags */
  char	ne_res[NERESBYTES];		/* Reserved */ 

};

On-disk segment entry struct new_seg { WORD ns_sector; /* Logical-sector offset (n byte) to the contents of the segment data, relative to the beginning of the file. Zero means no file data */ WORD ns_cbseg; /* Length of the segment in the file, in bytes. Zero means 64K */ WORD ns_flags; /* Flag word */ WORD ns_minalloc; /* Minimum allocation size of the segment, in bytes. Total size of the segment. Zero means 64K */ }; In-memory segment entry struct new_seg1 {

  WORD  ns1_sector;				/* Logical-sector offset (n byte) to the contents of the segment
								   data, relative to the beginning of the file. Zero means no
								   file data */
  WORD  ns1_cbseg;				/* Length of the segment in the file, in bytes. Zero means 64K */
  WORD  ns1_flags;				/* Flag word */
  WORD  ns1_minalloc;				/* Minimum allocation size of the segment, in bytes. Total size
								   of the segment. Zero means 64K */
  WORD  ns1_handle;				/* Selector or handle (selector - 1) of segment in memory */

};

struct new_segdata {

  union {
      struct {
          WORD      ns_niter;
          WORD      ns_nbytes;
          char      ns_iterdata;
      } ns_iter;
      struct {
          char      ns_data;
      } ns_noniter;
  } ns_union;

};

struct new_rlcinfo {

  WORD  nr_nreloc;

};

struct new_rlc {

  char            nr_stype;
  char            nr_flags;
  WORD  nr_soff;
  union {
      struct {
          char            nr_segno;
          char            nr_res;
          WORD  nr_entry;
        } nr_intref;
      struct {
          WORD  nr_mod;
          WORD  nr_proc;
        } nr_import;
      struct {
          WORD  nr_ostype;
          WORD  nr_osres;
        } nr_osfix;
    } nr_union;

};

#define NR_STYPE(x) (x).nr_stype #define NR_FLAGS(x) (x).nr_flags #define NR_SOFF(x) (x).nr_soff #define NR_SEGNO(x) (x).nr_union.nr_intref.nr_segno #define NR_RES(x) (x).nr_union.nr_intref.nr_res #define NR_ENTRY(x) (x).nr_union.nr_intref.nr_entry #define NR_MOD(x) (x).nr_union.nr_import.nr_mod #define NR_PROC(x) (x).nr_union.nr_import.nr_proc #define NR_OSTYPE(x) (x).nr_union.nr_osfix.nr_ostype #define NR_OSRES(x) (x).nr_union.nr_osfix.nr_osres

#define NRSTYP 0x0f #define NRSBYT 0x00 #define NRSSEG 0x02 #define NRSPTR 0x03 #define NRSOFF 0x05 #define NRPTR48 0x06 #define NROFF32 0x07 #define NRSOFF32 0x08

#define NRADD 0x04 #define NRRTYP 0x03 #define NRRINT 0x00 #define NRRORD 0x01 #define NRRNAM 0x02 #define NRROSF 0x03 #define NRICHAIN 0x08

#if (EXE386 == 0)

#define RS_LEN(x) (x).rs_len #define RS_STRING(x) (x).rs_string #define RS_ALIGN(x) (x).rs_align

#define RT_ID(x) (x).rt_id #define RT_NRES(x) (x).rt_nres #define RT_PROC(x) (x).rt_proc

#define RN_OFFSET(x) (x).rn_offset #define RN_LENGTH(x) (x).rn_length #define RN_FLAGS(x) (x).rn_flags #define RN_ID(x) (x).rn_id #define RN_HANDLE(x) (x).rn_handle #define RN_USAGE(x) (x).rn_usage

#define RSORDID 0x8000

#define RNMOVE 0x0010 #define RNPURE 0x0020 #define RNPRELOAD 0x0040 #define RNDISCARD 0xF000

#define NE_FFLAGS_LIBMODULE 0x8000

struct rsrc_string {

  char    rs_len;
  char    rs_string[1];

};

struct rsrc_typeinfo {

  WORD  rt_id;
  WORD  rt_nres;
  DWORD            rt_proc;

};

struct rsrc_nameinfo {

  WORD  rn_offset;
  WORD  rn_length;
  WORD  rn_flags;
  WORD  rn_id;
  WORD  rn_handle;
  WORD  rn_usage;

};

struct new_rsrc {

  WORD          rs_align;
  struct rsrc_typeinfo    rs_typeinfo;

};

#endif

#pragma pack(pop)

#ifdef __cplusplus } /* extern “C” */ #endif

#endif