TOOLCHAIN = riscv32-unknown-elf-
CC = $(TOOLCHAIN)gcc
OBJCOPY = $(TOOLCHAIN)objcopy
SIZE = $(TOOLCHAIN)size

FLAGS = -mabi=ilp32 -march=rv32i $(USER_FLAGS)
CFLAGS = -Os -Wall -ffunction-sections -fdata-sections -ffreestanding -MMD -MP
LDFLAGS = -nostartfiles -Wl,--gc-sections

SRC_DIR = src
BUILD_DIR = build

SRCS = $(wildcard $(patsubst %, %/*.c, . $(SRC_DIR)))
OBJS = $(addprefix $(BUILD_DIR)/, $(notdir $(SRCS:.c=.o)))
DEPS = $(OBJS:.o=.d)

VPATH = $(SRC_DIR)

$(@info $(shell mkdir -p ./$(BUILD_DIR) &> /dev/null))

all: $(BUILD_DIR)/cpu_bootloader.sv $(BUILD_DIR)/controller.rom

$(BUILD_DIR)/%.o: %.c
	$(CC) $(FLAGS) $(CFLAGS) -c $< -o $@

$(BUILD_DIR)/uc.elf: $(OBJS) SC64.ld
	$(CC) $(FLAGS) $(LDFLAGS) -TSC64.ld $(OBJS) -o $@

$(BUILD_DIR)/controller.rom: $(BUILD_DIR)/uc.elf
	$(OBJCOPY) -R .bootloader $(BUILD_DIR)/uc.elf $(BUILD_DIR)/controller.elf
	$(OBJCOPY) -O binary --set-section-flags .bss=alloc,contents $(BUILD_DIR)/controller.elf $(BUILD_DIR)/controller.bin
	$(OBJCOPY) -I binary -O ihex $(BUILD_DIR)/controller.bin $(BUILD_DIR)/controller.hex
	python3 tools/bin2rom.py $@ < $(BUILD_DIR)/controller.bin
	@echo 'Size of controller modules:'
	@$(SIZE) -B -t --common $(OBJS)
	@echo 'Size of controller:'
	@$(SIZE) -B $(BUILD_DIR)/controller.elf

$(BUILD_DIR)/cpu_bootloader.sv: $(BUILD_DIR)/uc.elf
	$(OBJCOPY) -j .bootloader $(BUILD_DIR)/uc.elf $(BUILD_DIR)/bootloader.elf
	$(OBJCOPY) -O binary $(BUILD_DIR)/bootloader.elf $(BUILD_DIR)/bootloader.bin
	python3 tools/bin2sv.py tools/cpu_bootloader_template.sv $@ < $(BUILD_DIR)/bootloader.bin
	@echo 'Size of bootloader:'
	@$(SIZE) -B $(BUILD_DIR)/bootloader.elf

clean:
	rm -rf ./$(BUILD_DIR)/*

.PHONY: all clean

-include $(DEPS)