Int 21 Fn 4B - Dos 2+ - "exec" - Load And/or Execute Program (Cont.)
bit 0: non-empty bundle
bit 1: 32-bit entry
01h WORD object number
03h BYTE entry type flags
bit 0: exported
bit 1: uses single data rather than instance
bit 2: reserved
bits 3-7: number of stack parameters
04h DWORD offset of entry point
08h 2 BYTEs ???
Note: empty bundles (bit flags at 00h = 00h) are used to skip unused indices,
and do not contain the remaining nine bytes
Format of LX linear executable entry table [array]:
Offset Size Description (Table 1302)
00h BYTE number of bundles following (00h = end of entry table)
01h BYTE bundle type
00h empty
01h 16-bit entry
02h 286 callgate entry
03h 32-bit entry
04h forwarder entry
bit 7 set if additional parameter typing information is present
---bundle type 00h---
no additional fields
---bundle type 01h---
02h WORD object number
04h BYTE entry flags
bit 0: exported
bits 7-3: number of stack parameters
05h WORD offset of entry point in object (shifted by page size shift)
---bundle type 02h---
02h WORD object number
04h BYTE entry flags
bit 0: exported
bits 7-3: number of stack parameters
05h WORD offset of entry point in object
07h WORD reserved for callgate selector (used by loader)
---bundle type 03h---
02h WORD object number
04h BYTE entry flags
bit 0: exported
bits 7-3: number of stack parameters
05h DWORD offset of entry point in object
---bundle type 04h---
02h WORD reserved
04h BYTE forwarder flags
bit 0: import by ordinal
bits 7-1 reserved
05h WORD module ordinal
(forwarder's index into Import Module Name table)
07h DWORD procedure name offset or import ordinal number
Note: all fields after the first two bytes are repeated N times
Bitfields for linear executable fixup type:
Bit(s) Description (Table 1303)
7 ordinal is BYTE rather than WORD
6 16-rather than 8-object number/module ordinal
5 addition with DWORD rather than WORD
4 relocation info has size with new two bytes at end
3 reserved (0)
2 set if add to destination, clear to replace destination
1-0 type
00 internal fixup
01 external fixup, imported by ordinal
10 external fixup, imported by name
11 internal fixup via entry table
Format of linear executable fixup record:
Offset Size Description (Table 1304)
00h BYTE type
bits 7-4: modifier (0001 single, 0011 multiple)
bits 3-0: type
0000 byte offset
0010 word segment
0011 16-bit far pointer (DWORD)
0101 16-bit offset
0110 32-bit far pointer (PWORD)
0111 32-bit offset
1000 near call or jump, WORD/DWORD based on seg attrib
01h BYTE linear executable fixup type (see #1303)
---if single type---
02h WORD offset within page
04h relocation information
---internal fixup---
BYTE object number
---external,ordinal---
BYTE one-based module number in Import Module table
BYTE/WORD ordinal number
WORD/DWORD value to add (only present if modifier bit 4 set)
---external,name---
BYTE one-based module number in Import Module table
WORD offset in Import Procedure names
WORD/DWORD value to add (only present if modifier bit 4 set)
---if multiple type---
02h BYTE number of items
03h var relocation info as for "single" type (above)
N WORDs offsets of items to relocate
Format of old Phar Lap .EXP file header:
Offset Size Description (Table 1305)
00h 2 BYTEs "MP" (4Dh 50h) signature
02h WORD remainder of image size / page size (page size = 512h)
04h WORD size of image in pages
06h WORD number of relocation items
08h WORD header size in paragraphs
0Ah WORD minimum number of extra 4K pages to be allocated at the end
of program, when it is loaded
0Ch WORD maximum number of extra 4K pages to be allocated at the end
of program, when it is loaded
0Eh DWORD initial ESP
12h WORD word checksum of file
14h DWORD initial EIP
18h WORD offset of first relocation item
1Ah WORD overlay number
1Ch WORD ??? (wants to be 1)
See Also: #1306
Format of new Phar Lap .EXP file header:
Offset Size Description (Table 1306)
00h 2 BYTEs signature ("P2" for 286 .EXP executable, "P3" for 386 .EXP)
02h WORD level (01h flat-model file, 02h multisegmented file)
04h WORD header size
06h DWORD file size in bytes
0Ah WORD checksum
0Ch DWORD offset of run-time parameters within file (see #1308)
10h DWORD size of run-time parameters in bytes
14h DWORD offset of relocation table within file
18h DWORD size of relocation table in bytes
1Ch DWORD offset of segment information table within file (see #1307)
20h DWORD size of segment information table in bytes
24h WORD size of segment information table entry in bytes
26h DWORD offset of load image within file
2Ah DWORD size of load image on disk
2Eh DWORD offset of symbol table within file or 00000000h
32h DWORD size of symbol table in bytes
36h DWORD offset of GDT within load image
3Ah DWORD size of GDT in bytes
3Eh DWORD offset of LDT within load image
42h DWORD size of LDT in bytes
46h DWORD offset of IDT within load image
4Ah DWORD size of IDT in bytes
4Eh DWORD offset of TSS within load image
52h DWORD size of TSS in bytes
56h DWORD minimum number of extra bytes to be allocated at end of program
(level 1 executables only)
5Ah DWORD maximum number of extra bytes to be allocated at end of program
(level 1 executables only)
5Eh DWORD base load offset (level 1 executables only)
62h DWORD initial ESP
66h WORD initial SS
68h DWORD initial EIP
6Ch WORD initial CS
6Eh WORD initial LDT
70h WORD initial TSS
72h WORD flags
bit 0: load image is packed
bit 1: 32-bit checksum is present
bits 4-2: type of relocation table
74h DWORD memory requirements for load image
78h DWORD 32-bit checksum (optional)
7Ch DWORD size of stack segment in bytes
80h 256 BYTEs reserved (0)
See Also: #1305,#1309
Format of Phar Lap segment information table entry:
Offset Size Description (Table 1307)
00h WORD selector number
02h WORD flags
04h DWORD base offset of selector
08h DWORD minimum number of extra bytes to be allocated to the segment
Format of 386|DOS-Extender run-time parameters:
Offset Size Description (Table 1308)
00h 2 BYTEs signature "DX" (44h 58h)
02h WORD minimum number of real-mode params to leave free at run time
04h WORD maximum number of real-mode params to leave free at run time
06h WORD minimum interrupt buffer size in KB
08h WORD maximum interrupt buffer size in KB
0Ah WORD number of interrupt stacks
0Ch WORD size in KB of each interrupt stack
0Eh DWORD offset of byte past end of real-mode code and data
12h WORD size in KB of call buffers
14h WORD flags
bit 0: file is virtual memory manager
bit 1: file is a debugger
16h WORD unprivileged flag (if nonzero, executes at ring 1, 2, or 3)
18h 104 BYTEs reserved (0)
Format of Phar Lap repeat block header:
Offset Size Description (Table 1309)
00h WORD byte count
02h BYTE repeat string length
Format of Borland debugging information header (following load image):
Offset Size Description (Table 1310)
00h WORD signature 52FBh
02h WORD version ID
04h DWORD size of name pool in bytes
08h WORD number of names in name pool
0Ah WORD number of type entries
0Ch WORD number of structure members
0Eh WORD number of symbols
10h WORD number of global symbols
12h WORD number of modules
14h WORD number of locals (optional)
16h WORD number of scopes in table
18h WORD number of line-number entries
1Ah WORD number of include files
1Ch WORD number of segment records
1Eh WORD number of segment/file correlations
20h DWORD size of load image after removing uninitialized data and debug
information
24h DWORD debugger hook; pointer into debugged program whose meaning
depends on program flags
28h BYTE program flags
bit 0: case-sensitive link
bit 1: pascal overlay program
29h WORD no longer used
2Bh WORD size of data pool in bytes
2Dh BYTE padding
2Eh WORD size of following header extension (currently 00h, 10h, or 20h)
30h WORD number of classes
32h WORD number of parents
34h WORD number of global classes (currently unused)
36h WORD number of overloads (currently unused)
38h WORD number of scope classes
3Ah WORD number of module classes
3Ch WORD number of coverage offsets
3Eh DWORD offset relative to symbol base of name pool
42h WORD number of browser information records
44h WORD number of optimized symbol records
46h WORD debugging flags
48h 8 BYTEs padding
Note: additional information on the Borland debugging info may be found in
Borland's Open Architecture Handbook
See Also: #1286