add lestub.nasm

src/lestub.nasm

@@ -0,0 +1,148 @@
+[MAP ALL]
+[SECTION MZ start=0x0000]
+dw 'MZ'     ; 00 magic num
+dw 0x0000   ; 02 bytes in last block
+dw 0x0006   ; 04 blocks in EXE
+dw 0x0000   ; 06 relocations
+dw 0x0004   ; 08 paragraphs in header
+dw 0x0000   ; 0A paragraphs of additional memory (BSS)
+dw 0xffff   ; 0C max extra mem
+dw 0x0000   ; 0E stack segment relative value
+dw 0x0500   ; 10 inital value of SP
+dw 0x0000   ; 12 checksum (0)
+dw 0x0000   ; 14 inital value of IP
+dw 0x0000   ; 16 inital value of CS
+dw 0x0040   ; 18 offset of first relocation (0x40 for LE)
+dw 0x0000   ; 1A overlay num, 0 for main program
+
+TIMES 0x3C - ($ - $$) db 0
+dd 0x00000080 ; 3C LE header offset
+
+[SECTION MSDOS start=0x0040 vstart=0x0000]
+; MS-DOS Stub
+[BITS 16]
+push cs
+pop ds
+mov dx,stubtext
+mov ah,0x9
+int 0x21
+mov ax,0x4c01
+int 0x21
+stubtext: db `This program cannot be run in DOS mode. (idiot)\r\n$`
+
+[SECTION LE start=0x0080]
+; LE header
+LE_HEADER:
+dw 'LE'       ; 00 LE signature
+db 0x00       ; 02 Byte order (little-endian)
+db 0x00       ; 03 Word order (little-endian)
+dd 0x00000000 ; 04 executable format level
+dw 0x0002     ; 08 CPU type (i386)
+dw 0x0001     ; 0A Target OS (OS/2)
+dd 0x00000000 ; 0C Module version
+dd 0x00000200 ; 10 Module type flags
+dd 0x00000002 ; 14 Number of memory pages
+dd 0x00000001 ; 18 Inital object CS number
+dd 0x00000000 ; 1C Inital EIP
+dd 0x00000002 ; 20 Inital object SS number
+dd 0x00080008 ; 24 Inital ESP
+dd 0x00001000 ; 28 Memory page size
+dd 0x00001000 ; 2C Bytes on last page
+dd 0x00000100 ; 30 Fix-up section size
+dd 0x00000000 ; 34 Fix-up section checksum
+dd 0x00000000 ; 38 Loader section size
+dd 0x00000000 ; 3C Loader section checksum
+dd 0x000000c4 ; 40 Offset of object table
+dd 0x00000002 ; 44 Object table entries
+dd 0x000000f4 ; 48 Object page map offset
+dd 0x00000000 ; 4C Object iterate data map offset
+dd 0x000000fc ; 50 Resource table offset
+dd 0x00000000 ; 54 Resource table entries
+dd 0x000000fc ; 58 Resident name tables offset
+dd 0x00000105 ; 5C Entry table offset
+dd 0x00000000 ; 60 Module directives table offset
+dd 0x00000000 ; 64 Module directives entry
+dd 0x00000106 ; 68 Fix-up page table offset
+dd 0x00000112 ; 6C Fix-up record table offset
+dd 0x00000000 ; 70 Imported modules name table offset
+dd 0x00000000 ; 74 Imported modules count
+dd 0x00000000 ; 78 Imported procedure name table offset
+dd 0x00000000 ; 7C Per-page checksum table offset
+dd 0x00001000 ; 80 Data pages offset from top of file
+dd 0x00000000 ; 84 Preload page count
+dd 0x00000000 ; 88 Non-resident names table offset from top of file
+dd 0x00000000 ; 8C Non-resident names table length
+dd 0x00000000 ; 90 Non-resident names table checksum
+dd 0x00000000 ; 94 Automatic data object
+dd 0x00000000 ; 98 Debug information offset
+dd 0x00000000 ; 9C Debug information length
+dd 0x00000000 ; A0 Preload instance pages number
+dd 0x00000000 ; A4 Demand instance pages number
+dd 0x00000000 ; A8 Extra heap allocation
+dd 0x00000000 ; AC ???
+TIMES 0xC4 - ($ - LE_HEADER) db 0
+; Object Table
+; CS @ C4h
+dd 0x00080000 ; 00 Virtual segment size
+dd 0x00000000 ; 04 Relocation base address
+dd 0x00002045 ; 08 Object flags
+dd 0x00000001 ; 0C Page map index
+dd 0x00000001 ; 10 Page map entries
+dd 0x00000000 ; 14 ???
+; SS @ DCh
+dd 0x00080080 ; 00 Virtual segment size
+dd 0x00070000 ; 04 Relocation base address
+dd 0x00002043 ; 08 Object flags
+dd 0x00000002 ; 0C Page map index
+dd 0x00000001 ; 10 Page map entries
+dd 0x00000000 ; 14 ???
+; Page Map @ F4
+; 3 byte Page Number, 1 byte Flags
+; 1, Code
+db 0x00, 0x00, 0x01  ; 3 byte Page Number
+db 0x00              ; Flags
+db 0x00, 0x00, 0x02  ; 3 byte Page Number
+db 0x00              ; Flags
+; Resource Table (0) & Resident Name Table
+db 5 ; String Length
+db 'hello' ; ASCII string
+dw 0x0000 ; Ordinal Number
+db 0x00 ; ???
+; 105h Entry Table?
+db 0x00
+; 106h Fixup Page Table
+dd 0x00000000 ; Record Offset of Page 1
+dd 0x00000007 ; Record Offset of Page 2
+dd 0x0000000E ; End of Records
+; 112h Fixup Record Table
+fixup_table_start:
+db 0x07, 0x00 ; 32-bit internal relocation
+dw 0x0000 ; source offset in page
+db 0x01 ; target object
+dw 0x0000 ; text - entry ; target offset
+db 0x07, 0x00 ; 32-bit internal relocation
+dw 0x0000 ; source offset in page
+db 0x02 ; target object
+dw 0x0000 ; target offset
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+db 0x07, 0x00, 0xff, 0x00, 0x01, 0x01, 0x00
+fixup_table_end: