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libsrc/common/setjmp.s

@@ -0,0 +1,52 @@
+;
+; Ullrich von Bassewitz, 06.06.1998
+;
+; int setjmp (jmp_buf buf);
+;
+
+	.export		__setjmp
+	.importzp	sp, ptr1
+
+__setjmp:
+	sta	ptr1		; Save buf
+	stx	ptr1+1
+	ldy	#0
+
+; The parameter stack is now empty, put it into buf
+
+	lda	sp
+	sta	(ptr1),y
+	iny
+	lda	sp+1
+	sta    	(ptr1),y
+	iny
+
+; Put the return stack pointer next
+
+	tsx
+	inx
+	inx			; drop return address
+	txa
+	sta	(ptr1),y
+	iny
+
+; Last thing is the return address.
+
+	pla
+	tax
+	pla
+	sta	(ptr1),y	; high byte first
+	iny
+	pha
+	txa
+	sta	(ptr1),y
+	pha
+
+; Return zero
+
+	lda	#0
+	tax
+	rts
+
+
+