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|
; align.asm
; (C) 2004 Julian Albo
; This code may be freely used.
;--------------------------------------------------------------------
; Sample of macro that can be used to align the current position to
; a multiple of some number, like the align and aligndata directives
; of some oher assemblers.
;--------------------------------------------------------------------
align macro n
local newpos, oldpos
oldpos equ $
newpos equ (oldpos + n - 1) / n * n
if newpos < oldpos
.error Align out of memory
endif
; The second method is faster, the first can be used to align code
; in 8086 generation mode (code of NOP is not 00).
; If align of data and code is needed can be better to define another
; macro called aligndata.
if defined ALIGN_WITH_NOP
rept newpos - oldpos
nop
endm
else
org newpos
endif
endm ; align
;--------------------------------------------------------------------
; Test program.
;--------------------------------------------------------------------
org 100h ; To view the result with a cp/m debugger.
ld a, a
align 8
ld a, b
ld a, c
ld a, d
align 64
align 16 ; Do nothing, already aligned.
ld a, e
if defined TESTERROR
org 0E000h
ld a, h
align 16384 ; Must generate an error.
ld a, l
endif
end
;--------------------------------------------------------------------
; End of align.asm
|
