add regression tests to makefile

Makefrag

@@ -46,3 +46,37 @@ $(FIRRTL_FILE) $(ANNO_FILE): $(rocketchip_stamp) $(extra_stamps) $(call lookup_s
 
 $(VERILOG_FILE): $(FIRRTL_FILE) $(ANNO_FILE) $(FIRRTL_JAR)
 	$(FIRRTL) -i $(FIRRTL_FILE) -o $(VERILOG_FILE) -X verilog -faf $(ANNO_FILE)
+
+regression-tests = \
+	rv64ud-v-fcvt \
+        rv64ud-p-fdiv \
+        rv64ud-v-fadd \
+        rv64uf-v-fadd \
+        rv64um-v-mul \
+        rv64mi-p-breakpoint \
+        rv64uc-v-rvc \
+        rv64ud-v-structural \
+        rv64si-p-wfi \
+        rv64um-v-divw \
+        rv64ua-v-lrsc \
+        rv64ui-v-fence_i \
+        rv64ud-v-fcvt_w \
+        rv64uf-v-fmin \
+        rv64ui-v-sb \
+        rv64ua-v-amomax_d \
+        rv64ud-v-move \
+        rv64ud-v-fclass \
+        rv64ua-v-amoand_d \
+        rv64ua-v-amoxor_d \
+        rv64si-p-sbreak \
+        rv64ud-v-fmadd \
+        rv64uf-v-ldst \
+        rv64um-v-mulh \
+        rv64si-p-dirty
+
+output_dir=$(sim_dir)/output
+
+$(output_dir)/%: $(RISCV)/riscv64-unknown-elf/share/riscv-tests/isa/%
+	mkdir -p $(output_dir)
+	ln -sf $< $@
+