BUILD_DIR = build
CC = riscv64-linux-gnu-gcc
# CFLAGS = -march=rv32i -mabi=ilp32
CFLAGS = -march=rv64i -mabi=lp64

AS = riscv64-linux-gnu-as
ASFLAGS = $(CFLAGS)

LD = riscv64-linux-gnu-ld
LDFLAGS = -T test.ld

all: $(BUILD_DIR)/text.hex $(BUILD_DIR)/data.hex

$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)
	
$(BUILD_DIR)/%.o: %.S | $(BUILD_DIR)
	$(AS) $(ASFLAGS) $^ -o $@

$(BUILD_DIR)/%.o: %.c | $(BUILD_DIR)
	$(CC) $(CFLAGS) $^ -o $@

$(BUILD_DIR)/%.elf: $(BUILD_DIR)/%.o %.ld
	$(LD) $(LDFLAGS) $< -o $@

$(BUILD_DIR)/text.hex: $(BUILD_DIR)/test.elf
	riscv64-linux-gnu-objdump -s $^ | sed -n '/.text/,$$p' | tail -n+2 | sed -n '/.data/,$$!p' | cut -f3-6 -d ' ' | sed -e 's/ /\n/g' | sed 's/^\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/' > $@

$(BUILD_DIR)/data.hex: $(BUILD_DIR)/test.elf
	riscv64-linux-gnu-objdump -s $^ | sed -n '/.data/,$$p' | tail -n+2 | sed -n '/.bss/,$$!p' | cut -f3-6 -d ' ' | sed -e 's/ /\n/g' | sed 's/^\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/' > $@

clean:
	rm -rf $(BUILD_DIR)