export RV_ROOT = ${PWD}/../..
LLVMINSTALL = /home/colin/develop/llvm-build/install
GCC_PREFIX = /opt/riscv/bin/riscv64-unknown-elf


TEST_CFLAGS = -g -O3 -funroll-all-loops
ABI = -mabi=ilp32 -march=rv32imc

# Allow tool override
VERILATOR = verilator
TESTDIR = ${PWD}
BUILD_DIR = ${TESTDIR}/build
SWERV_CONFIG = ${TESTDIR}/swerv.config
RV_DESIGN = ${RV_ROOT}/design

TEST = hello_world

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

LINK = $(TESTDIR)/link.ld

OFILES = $(TEST).o
OUTFILES = $(TEST).out

VPATH = $(BUILD_DIR) $(TESTDIR)
TESTFILES = $(TESTDIR)/tb_top.sv $(TESTDIR)/ahb_sif.sv

defines = $(BUILD_DIR)/common_defines.vh ${RV_DESIGN}/include/swerv_types.sv
includes = -I${RV_DESIGN}/include -I${RV_DESIGN}/lib  -I${BUILD_DIR}

# 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

# If define files do not exist, then run swerv.config.
${BUILD_DIR}/defines.h :
	BUILD_PATH=${BUILD_DIR} ${SWERV_CONFIG} -target=default -set iccm_enable

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

verilator-build: ${TESTFILES} ${BUILD_DIR}/defines.h test_tb_top.cpp
	echo '`undef ASSERT_ON' >> ${BUILD_DIR}/common_defines.vh
	$(VERILATOR) --cc -CFLAGS ${CFLAGS} $(defines) $(includes) \
	              -Wno-UNOPTFLAT \
	              -I${TESTDIR} \
		            -f ${TESTDIR}/flist \
	              ${TESTFILES} \
	              --top-module tb_top -exe test_tb_top.cpp --autoflush $(VERILATOR_DEBUG)
	cp ${TESTDIR}/test_tb_top.cpp obj_dir
	$(MAKE) -j -C obj_dir/ -f Vtb_top.mk $(VERILATOR_MAKE_FLAGS)

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

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

##################### Test Build #####################################

# program.hex: $(OFILES) $(LINK)
# 	@echo Building $(TEST)
# 	$(GCC_PREFIX)-gcc $(ABI) -Wl,-Map=$(BUILD_DIR)/$(TEST).map -lgcc -T$(LINK) -o $(BUILD_DIR)/$(TEST).bin $(BUILD_DIR)/$(OFILES) -nostartfiles  $(TEST_LIBS)
# 	$(GCC_PREFIX)-objcopy -O verilog $(BUILD_DIR)/$(TEST).bin $(BUILD_DIR)/program.hex
# 	$(GCC_PREFIX)-objdump -S  $(BUILD_DIR)/$(TEST).bin > $(BUILD_DIR)/$(TEST).dis
# 	@echo Completed building $(TEST)

# %.o : %.s ${BUILD_DIR}/defines.h
# 	$(GCC_PREFIX)-cpp -I${BUILD_DIR}  $<  > $(BUILD_DIR)/$*.cpp.s
# 	$(GCC_PREFIX)-as $(ABI) $(BUILD_DIR)/$*.cpp.s -o $(BUILD_DIR)/$@

program.hex: $(OUTFILES)
	@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

##################### llvm hex Build #####################################

build: $(OUTFILES)
	@echo Completed building $(TEST)

%.out : %.c ${BUILD_DIR}/defines.h
	$(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