Makefile

ARMGNU ?= ~/arm64/host/bin/aarch64-linux

COPS = -g -O0 -Wall -nostdlib -nostartfiles -ffreestanding -Iinclude -mgeneral-regs-only
ASMOPS = -Iinclude 

BUILD_DIR = build
SRC_DIR = src

all : kernel8.img

clean :
	rm -rf $(BUILD_DIR) *.img 123

$(BUILD_DIR)/%_s.o: $(SRC_DIR)/%.S
	mkdir -p $(@D)
	$(ARMGNU)-gcc $(ASMOPS) -MMD -c $< -o $@

$(BUILD_DIR)/%_c.o: $(SRC_DIR)/%.c
	$(ARMGNU)-gcc $(COPS) -MMD -c $< -o $@

C_FILES = $(wildcard $(SRC_DIR)/*.c)
ASM_FILES = $(wildcard $(SRC_DIR)/*.S)
OBJ_FILES += $(ASM_FILES:$(SRC_DIR)/%.S=$(BUILD_DIR)/%_s.o)
OBJ_FILES += $(C_FILES:$(SRC_DIR)/%.c=$(BUILD_DIR)/%_c.o)

#DEP_FILES = $(OBJ_FILES:%.o=%.d)
#-include $(DEP_FILES)

kernel8.img: $(SRC_DIR)/linker.ld $(OBJ_FILES)
	$(ARMGNU)-ld -T $(SRC_DIR)/linker.ld -o $(BUILD_DIR)/kernel8.elf  $(OBJ_FILES)
	$(ARMGNU)-objcopy $(BUILD_DIR)/kernel8.elf -O binary $(BUILD_DIR)/kernel8.bin
	$(ARMGNU)-objdump -d $(BUILD_DIR)/kernel8.elf > 123