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cc65/libsrc/runtime/enter.s

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;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: function prologue
;
.export enter
.importzp sp
enter: tya ; get arg size
ldy sp
bne L1
dec sp+1
L1: dec sp
ldy #0
sta (sp),y ; Store the arg count
rts