upgrade to latest rocket-chip

tests/Makefile

@@ -1,8 +1,13 @@
 GCC=riscv64-unknown-elf-gcc
+OBJDUMP=riscv64-unknown-elf-objdump
 CFLAGS=-mcmodel=medany -std=gnu99 -O2 -fno-common -fno-builtin-printf
 LDFLAGS=-static -nostdlib -nostartfiles -lgcc
 
-default: pwm.riscv
+PROGRAMS = pwm
+
+default: $(addsuffix .riscv,$(PROGRAMS))
+
+dumps: $(addsuffix .dump,$(PROGRAMS))
 
 %.o: %.S
 	$(GCC) $(CFLAGS) -D__ASSEMBLY__=1 -c $< -o $@
@@ -13,5 +18,8 @@ default: pwm.riscv
 %.riscv: %.o crt.o syscalls.o
 	$(GCC) -T link.ld $(LDFLAGS) $^ -o $@
 
+%.dump: %.riscv
+	$(OBJDUMP) -D $< > $@
+
 clean:
-	rm -f *.riscv *.o
+	rm -f *.riscv *.o *.dump