refined vector exception interface

rocket/src/main/scala/dpath.scala

@@ -384,7 +384,7 @@ class rocketDpath extends Component
     vec.io.wdata := wb_reg_vec_wdata
     vec.io.rs2 := wb_reg_rs2
     vec.io.vec_eaddr := pcr.io.vec_eaddr
-    vec.io.vec_exception := pcr.io.vec_exception
+    vec.io.vec_xcpt := pcr.io.vec_xcpt
 
     wb_wdata :=
       Mux(vec.io.wen, Cat(Bits(0,52), vec.io.appvl),