mirror of
https://github.com/cc65/cc65.git
synced 2024-11-07 21:10:15 +00:00
34 lines
486 B
ArmAsm
34 lines
486 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 05.08.1998
|
||
|
|
;
|
||
|
|
; CC65 runtime: long sub reversed
|
||
|
|
;
|
||
|
|
|
||
|
|
;
|
||
|
|
; EAX = EAX - TOS
|
||
|
|
;
|
||
|
|
.export tosrsubeax
|
||
|
|
.import addysp1
|
||
|
|
.importzp sp, sreg, tmp1
|
||
|
|
|
||
|
|
tosrsubeax:
|
||
|
|
ldy #0
|
||
|
|
sec
|
||
|
|
sbc (sp),y ; byte 0
|
||
|
|
sta tmp1 ; use as temp storage
|
||
|
|
txa
|
||
|
|
iny
|
||
|
|
sbc (sp),y ; byte 1
|
||
|
|
tax
|
||
|
|
iny
|
||
|
|
lda sreg
|
||
|
|
sbc (sp),y ; byte 2
|
||
|
|
sta sreg
|
||
|
|
iny
|
||
|
|
lda sreg+1
|
||
|
|
sbc (sp),y ; byte 3
|
||
|
|
sta sreg+1
|
||
|
|
lda tmp1
|
||
|
|
jmp addysp1 ; drop TOS
|
||
|
|
|