2000-10-25 19:53:22 +00:00
|
|
|
;
|
|
|
|
|
; Ullrich von Bassewitz, 25.10.2000
|
|
|
|
|
;
|
|
|
|
|
; CC65 runtime: Increment the stackpointer by 2. For performance reasons,
|
|
|
|
|
; this modules does also contain the popax function.
|
|
|
|
|
|
|
|
|
|
.export popax, incsp2
|
|
|
|
|
.importzp sp
|
|
|
|
|
|
|
|
|
|
; Pop a/x from stack. This function will run directly into incsp2
|
|
|
|
|
|
|
|
|
|
.proc popax
|
|
|
|
|
|
|
|
|
|
ldy #1
|
|
|
|
|
lda (sp),y ; get hi byte
|
|
|
|
|
tax ; into x
|
2000-11-27 23:37:53 +00:00
|
|
|
.ifpc02
|
|
|
|
|
lda (sp) ; get lo byte
|
|
|
|
|
.else
|
2000-10-25 19:53:22 +00:00
|
|
|
dey
|
|
|
|
|
lda (sp),y ; get lo byte
|
2000-11-27 23:37:53 +00:00
|
|
|
.endif
|
2000-10-25 19:53:22 +00:00
|
|
|
|
|
|
|
|
.endproc
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
.proc incsp2
|
|
|
|
|
|
|
|
|
|
ldy sp ; 3
|
|
|
|
|
iny ; 2
|
|
|
|
|
beq @L1 ; 2
|
|
|
|
|
iny ; 2
|
|
|
|
|
beq @L2 ; 2
|
|
|
|
|
sty sp ; 3
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
@L1: iny ; 2
|
|
|
|
|
@L2: sty sp ; 3
|
|
|
|
|
inc sp+1 ; 5
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
.endproc
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
