mirror of
https://github.com/cc65/cc65.git
synced 2024-07-13 12:29:10 +00:00
27 lines
280 B
ArmAsm
27 lines
280 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 29.12.1999
|
||
|
|
;
|
||
|
|
; CC65 runtime: Decrement eax by value in Y
|
||
|
|
;
|
||
|
|
|
||
|
|
.export deceaxy
|
||
|
|
.importzp ptr4, sreg
|
||
|
|
|
||
|
|
deceaxy:
|
||
|
|
sty ptr4
|
||
|
|
sec
|
||
|
|
sbc ptr4
|
||
|
|
sta ptr4
|
||
|
|
txa
|
||
|
|
sbc #0
|
||
|
|
tax
|
||
|
|
lda sreg
|
||
|
|
sbc #0
|
||
|
|
sta sreg
|
||
|
|
lda sreg+1
|
||
|
|
sbc #0
|
||
|
|
sta sreg+1
|
||
|
|
lda ptr4
|
||
|
|
rts
|
||
|
|
|