NASM Map Unix Sections to DOS Segments

Makefile

.SUFFIXES : .asm .obj

AS=nasm
ASPPFLAGS=-DAPI=MSDOS_API -DCPU_TARGET=8086
ASFLAGS=-fobj
LINK=wcl
LINKFLAGS=-zq -bcl=dos -fm
RM=rm
RMFLAGS=-rf


sec2seg.exe: sec2seg.obj
	$(LINK) $(LINKFLAGS) -fe=sec2seg.exe sec2seg.obj

.asm.obj:
	$(AS) $(ASPPFLAGS) $(ASFLAGS) -o$@ -l$*.lst $<
	
clean:
	$(RM) $(RMFLAGS) *.exe *.obj *.map *.lst

sec2seg.asm

CPU CPU_TARGET

;Macros to define sections- see http://www.siliconkit.com/rebecca/help/masmpguide/Appendix_E.htm
GROUP DGROUP _DATA _BSS

%macro .text 0-1.nolist
	%if %0 == 0
		segment _TEXT public align=2 class=CODE
	%else
		segment %1 public align=2 class=CODE
	%endif
%endm

%define .code .text


%macro .data 0-1.nolist
	%if %0 == 0
		segment _DATA public align=2 class=DATA
	%else
		segment %1 public align=16 class=%1
	%endif
%endm

%macro .const 0-1.nolist
	%if %0 == 0
		segment CONST public align=2 class=CONST
	%else
		segment %1 public align=16 class=%1
	%endif
%endm

%macro .bss 0-1.nolist
	%if %0 == 0
		segment _BSS public align=2 class=BSS
	%else
		segment %1 public align=16 class=%1
	%endif
%endm

%define .data? .bss


%macro .fardata 0-1.nolist
	%if %0 == 0
		segment FAR_DATA private align=16 class=FAR_DATA
	%else
		segment %1 private align=16 class=FAR_DATA
	%endif
%endm

%macro .farbss 0-1.nolist
	%if %0 == 0
		segment FAR_BSS private align=16 class=FAR_BSS
	%else
		segment %1 private align=16 class=FAR_BSS
	%endif
%endm

%define .fardata? .farbss

;Shut up OMF linkers by declaring a stack segment
%macro .stack 0
	segment STACK stack align=16 class=STACK
%endm




.text
..start:

	
	mov ax, 4c00h
	int 21h
	
.data
dw 0

.bss
resw 1

.const
db 'Hello world!'

.data MY_DATA
dw 0

.bss MY_BSS
resw 1

.fardata
dw 0

.farbss
resw 1

.fardata MY_FARDATA
dw 0

.farbss MY_FARBSS
resb 1

;Cause unsuppressible warning, though safe to ignore.
;.data
;dw 1

.stack