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libsrc/common/longjmp.s

@@ -0,0 +1,48 @@
+;
+; Ullrich von Bassewitz, 06.06.1998
+;
+; void longjmp (jmp_buf buf, int retval);
+;
+
+	.export		_longjmp
+	.import		popax
+	.importzp	sp, ptr1, ptr2
+
+_longjmp:
+	sta	ptr2	     	; Save retval
+	stx	ptr2+1
+	jsr	popax		; get buf
+	sta	ptr1
+	stx	ptr1+1
+	ldy	#0
+	   
+; Get the old parameter stack
+
+       	lda	(ptr1),y
+	iny
+       	sta	sp
+	lda	(ptr1),y
+	iny
+	sta	sp+1
+
+; Get the old stack pointer
+
+	lda	(ptr1),y
+	iny
+	tax
+	txs
+
+; Get the return address and push it on the stack
+
+	lda	(ptr1),y
+	iny
+	pha
+	lda	(ptr1),y
+	pha
+
+; Load the return value and return to the caller
+
+	lda	ptr2
+	ldx	ptr2+1
+	rts
+