export RV_ROOT = ${PWD}/../..
LLVMINSTALL = /home/colin/develop/llvm-build/install
GCC_PREFIX = /opt/riscv/bin/riscv32-unknown-elf

DEMODIR = ${PWD}
BUILD_DIR = ${DEMODIR}/build
RV_DESIGN = ${RV_ROOT}/design
RV_SOC = ${RV_ROOT}/soc

TEST = hello_world

ifdef debug
 DEBUG_PLUS = +dumpon
 VERILATOR_DEBUG = --trace
endif

LINK = $(DEMODIR)/link.ld

# CFLAGS for verilator generated Makefiles. Without -std=c++11 it complains for `auto` variables
CFLAGS += "-std=c++11"
# Optimization for better performance; alternative is nothing for slower runtime (faster compiles)
# -O2 for faster runtime (slower compiles), or -O for balance.
VERILATOR_MAKE_FLAGS = OPT_FAST="-Os"

# Targets
all: clean verilator

clean:
	rm -rf build obj_dir

swerv_define :
	BUILD_PATH=${BUILD_DIR} PERLLIB=${RV_SOC} ${RV_SOC}/swerv.config -target=default -set iccm_enable

##################### Verilog Builds #####################################

verilator-build: swerv_define
	echo '`undef ASSERT_ON' >> ${BUILD_DIR}/common_defines.vh
	verilator --cc -CFLAGS ${CFLAGS} \
	              $(BUILD_DIR)/common_defines.vh \
	              -I${BUILD_DIR} \
	              -Wno-UNOPTFLAT \
	              -F ${RV_SOC}/soc_top.mk \
	              -F ${RV_SOC}/soc_sim.mk \
	              $(RV_SOC)/soc_sim.sv \
	              --top-module soc_sim -exe test_soc_sim.cpp --autoflush $(VERILATOR_DEBUG)
	cp ${DEMODIR}/test_soc_sim.cpp obj_dir
	$(MAKE) -j -C obj_dir/ -f Vsoc_sim.mk $(VERILATOR_MAKE_FLAGS)

##################### Simulation Runs #####################################

verilator: program.hex verilator-build
	cd build && ../obj_dir/Vsoc_sim ${DEBUG_PLUS}

##################### Test hex Build #####################################

program.hex: $(TEST).out
	@echo Building $(TEST)
	$(GCC_PREFIX)-objcopy -O verilog $(BUILD_DIR)/$(TEST).out $(BUILD_DIR)/program.hex
	$(GCC_PREFIX)-objdump -S  $(BUILD_DIR)/$(TEST).out > $(BUILD_DIR)/$(TEST).dis

build: $(TEST).out
	@echo Completed building $(TEST)

%.out : %.c swerv_define
	$(LLVMINSTALL)/bin/clang --target=riscv32 -march=rv32gc $*.c -S -o $(BUILD_DIR)/$*.s -mno-relax
	$(LLVMINSTALL)/bin/clang --target=riscv32 -march=rv32gc $*.c -c -o $(BUILD_DIR)/$*.o -mno-relax
	$(LLVMINSTALL)/bin/ld.lld $(BUILD_DIR)/$*.o -Map=$(BUILD_DIR)/$(TEST).map -T$(LINK) -o $(BUILD_DIR)/$*.out
	@echo Completed building $(TEST)

help:
	@echo Possible targets: verilator help clean all verilator-build program.hex

.PHONY: help clean verilator