; -*- nasm -*-

; NASM macro file to allow the `bin' output format to generate

; simple .EXE files by constructing the EXE header by hand.

; Adapted from a contribution by Yann Guidon <whygee_corp@hol.fr>



%define EXE_stack_size EXE_realstacksize



%macro EXE_begin 0

	  ORG 0E0h

	  section .text



header_start:

	  db 4Dh,5Ah		; EXE file signature

	  dw EXE_allocsize % 512

	  dw (EXE_allocsize + 511) / 512

	  dw 0			; relocation information: none

	  dw (header_end-header_start)/16 ; header size in paragraphs

	  dw (EXE_absssize + EXE_realstacksize) / 16 ; min extra mem

	  dw (EXE_absssize + EXE_realstacksize) / 16 ; max extra mem

	  dw -10h		; Initial SS (before fixup)

	  dw EXE_endbss + EXE_realstacksize ; Initial SP (1K DPMI+1K STACK)

	  dw 0			; (no) Checksum

	  dw 100h		; Initial IP - start just after the header

	  dw -10h		; Initial CS (before fixup)

	  dw 0			; file offset to relocation table: none

	  dw 0			; (no overlay)

	  align 16,db 0

header_end:



EXE_startcode:

	  section .data

EXE_startdata:

	  section .bss

EXE_startbss:

%endmacro



%macro EXE_stack 1

EXE_realstacksize equ %1

%define EXE_stack_size EXE_bogusstacksize ; defeat EQU in EXE_end

%endmacro



%macro EXE_end 0

	  section .text

EXE_endcode:

	  section .data

EXE_enddata:

	  section .bss

	  alignb 4

EXE_endbss:



EXE_acodesize equ (EXE_endcode-EXE_startcode+3) & (~3)

EXE_datasize equ EXE_enddata-EXE_startdata

EXE_absssize equ (EXE_endbss-EXE_startbss+3) & (~3)

EXE_allocsize equ EXE_acodesize + EXE_datasize



EXE_stack_size equ 0x800	; default if nothing else was used

%endmacro