48 lines
907 B
ArmAsm
48 lines
907 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 25.10.2000
|
|
;
|
|
; CC65 runtime: Increment the stackpointer by 2. For performance reasons,
|
|
; this module also contains the popax function.
|
|
|
|
.export popax, incsp2
|
|
.importzp spc
|
|
|
|
.macpack cpu
|
|
|
|
; Pop a/x from stack. This function will run directly into incsp2
|
|
|
|
.proc popax
|
|
|
|
ldy #1
|
|
lda (spc),y ; get hi byte
|
|
tax ; into x
|
|
.if (.cpu .bitand ::CPU_ISET_65SC02)
|
|
lda (spc) ; get lo byte
|
|
.else
|
|
dey
|
|
lda (spc),y ; get lo byte
|
|
.endif
|
|
|
|
.endproc
|
|
|
|
|
|
|
|
.proc incsp2
|
|
|
|
inc spc ; 5
|
|
beq @L1 ; 2
|
|
inc spc ; 5
|
|
beq @L2 ; 2
|
|
rts
|
|
|
|
@L1: inc spc ; 5
|
|
@L2: inc spc+1 ; 5
|
|
rts
|
|
|
|
.endproc
|
|
|
|
|
|
|
|
|
|
|