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libsrc/runtime/leave.s

@@ -0,0 +1,37 @@
+;  
+; Ullrich von Bassewitz, 06.08.1998
+;
+; CC65 runtime: function epilogue
+;
+
+; exit a function.  pop stack and rts. The function comes in different
+; flavours that provide default values for the return val, or drop a local
+; stack frame with size in y.
+
+ 	.export		leave00, leave0, leavey00, leavey0, leavey
+	.export		leave
+	.import	       	addysp
+	.importzp	sp
+
+leave00:
+	lda	#0
+leave0:	ldx	#0
+     	beq	leave
+
+leavey00:
+     	lda	#0     	     	; "return 0"
+leavey0:
+     	ldx	#0     	     	; return < 256
+leavey:
+     	jsr	addysp 	     	; drop stack frame
+leave:	pha	       	     	; save A a sec
+ 	ldy	#0
+ 	lda	(sp),y 	     	; that's the pushed arg size
+	sec			; Count the byte, the count's stored in
+	adc	sp
+	sta	sp
+	bcc	L1
+	inc	sp+1
+L1:	pla	  		; Get return value back
+       	rts
+