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libsrc/common/stkcheck.s

@@ -0,0 +1,48 @@
+;
+; Ullrich von Bassewitz, 18.08.1998
+;
+; Stack checker
+;
+
+
+	.export		_stkcheck, __stksafety
+	.import		pushax, exit
+	.import		__hend
+	.importzp	sp
+
+.data
+__stksafety:
+     	.word	64			;
+
+.code
+_stkcheck:
+	clc
+	lda	__hend
+	adc	__stksafety
+	tax				; Remember low byte
+	lda	__hend+1
+	adc	__stksafety+1
+
+	cmp	sp+1
+	bcc	Ok
+       	bne	L1
+	cpx	sp
+	bcc	Ok
+
+; Stack overflow
+
+L1:    	inc	sp+1			; Create 256 bytes of space
+	ldx    	#0
+	lda	#4
+	jsr	pushax
+	jmp	exit
+
+; All is well
+
+Ok:	rts
+
+
+
+
+
+