Add original unix v6

source/s5/reset.s

@@ -0,0 +1,31 @@
+/ C library -- reset, setexit
+
+/	reset()
+/ will generate a "return" from
+/ the last call to
+/	setexit()
+/ by restoring sp, r5
+/ and doing a return.
+/
+/ useful for going back to the main loop
+/ after a horrible error in a lowlevel
+/ routine.
+
+.globl	_setexit
+.globl	_reset
+.globl	csv, cret
+
+_setexit:
+	jsr	r5,csv
+	mov	r5,sr5
+	mov	2(r5),spc
+	jmp	cret
+
+_reset:
+	mov	sr5,r5
+	mov	spc,2(r5)
+	jmp	cret
+
+.bss
+sr5:	.=.+2
+spc:	.=.+2