Description

On-disk format of DOS file header.

Definition at line 28313 of file binaryInstruction.C.

Public Attributes
unsigned char	e_magic [2]
	0x00 "MZ"

uint16_t	e_last_page_size
	0x02 bytes used on last page of file (1 page == 512 bytes); zero implies if last page is full.

uint16_t	e_total_pages
	0x04 number of pages (inc.

uint16_t	e_nrelocs
	0x06 number of relocation entries stored after this header.

uint16_t	e_header_paragraphs
	0x08 header size in paragraphs (16-byte blocks) inc.

uint16_t	e_minalloc
	0x0a number of extra paragraphs needed, similar to BSS in Unix.

uint16_t	e_maxalloc
	0x0c max paragraphs to allocate for BSS.

uint16_t	e_ss
	0x0e initial value of SS register relative to program load segment.

uint16_t	e_sp
	0x10 initial value for SP register.

uint16_t	e_cksum
	0x12 checksum; 16-bit sum of all words in file should be zero (usually not filled in).

uint16_t	e_ip
	0x14 initial value for IP register.

uint16_t	e_cs
	0x16 initial value for CS register relative to program load segment.

uint16_t	e_relocs_offset
	0x18 file address of relocation table.

uint16_t	e_overlay
	0x1a overlay number (zero indicates main program).

uint32_t	e_res1
	0x1c unknown purpose.

Member Data Documentation

◆ e_magic

unsigned char SgAsmDOSFileHeader::DOSFileHeader_disk::e_magic[2]

0x00 "MZ"

Definition at line 28314 of file binaryInstruction.C.

◆ e_last_page_size

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_last_page_size

0x02 bytes used on last page of file (1 page == 512 bytes); zero implies if last page is full.

Definition at line 28315 of file binaryInstruction.C.

◆ e_total_pages

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_total_pages

0x04 number of pages (inc.

last possibly partial page) in file.

Definition at line 28317 of file binaryInstruction.C.

◆ e_nrelocs

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_nrelocs

0x06 number of relocation entries stored after this header.

Definition at line 28318 of file binaryInstruction.C.

◆ e_header_paragraphs

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_header_paragraphs

0x08 header size in paragraphs (16-byte blocks) inc.

relocations.

Definition at line 28319 of file binaryInstruction.C.

◆ e_minalloc

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_minalloc

0x0a number of extra paragraphs needed, similar to BSS in Unix.

Definition at line 28320 of file binaryInstruction.C.

◆ e_maxalloc

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_maxalloc

0x0c max paragraphs to allocate for BSS.

Definition at line 28321 of file binaryInstruction.C.

◆ e_ss

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_ss

0x0e initial value of SS register relative to program load segment.

Definition at line 28322 of file binaryInstruction.C.

◆ e_sp

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_sp

0x10 initial value for SP register.

Definition at line 28323 of file binaryInstruction.C.

◆ e_cksum

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_cksum

0x12 checksum; 16-bit sum of all words in file should be zero (usually not filled in).

Definition at line 28324 of file binaryInstruction.C.

◆ e_ip

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_ip

0x14 initial value for IP register.

Definition at line 28326 of file binaryInstruction.C.

◆ e_cs

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_cs

0x16 initial value for CS register relative to program load segment.

Definition at line 28327 of file binaryInstruction.C.

◆ e_relocs_offset

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_relocs_offset

0x18 file address of relocation table.

Definition at line 28328 of file binaryInstruction.C.

◆ e_overlay

uint16_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_overlay

0x1a overlay number (zero indicates main program).

Definition at line 28329 of file binaryInstruction.C.

◆ e_res1

uint32_t SgAsmDOSFileHeader::DOSFileHeader_disk::e_res1

0x1c unknown purpose.

Definition at line 28330 of file binaryInstruction.C.

The documentation for this struct was generated from the following file:

binaryInstruction.C