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TOOLCHAIN := $(HOME)/bin/arm-gnu-toolchain-14.2.rel1-x86_64-aarch64-none-elf
TOOLCHAIN_BIN := $(TOOLCHAIN)/bin
TOOLCHAIN_LIB := $(TOOLCHAIN)/lib/gcc/aarch64-none-elf/14.2.1/include
AS := $(TOOLCHAIN_BIN)/aarch64-none-elf-as
CC := $(TOOLCHAIN_BIN)/aarch64-none-elf-gcc
LD := $(TOOLCHAIN_BIN)/aarch64-none-elf-ld
OBJCOPY := $(TOOLCHAIN_BIN)/aarch64-none-elf-objcopy
SRC_DIR := src
BUILD_DIR := build
OBJ_DIR := $(BUILD_DIR)
BIN_DIR := $(BUILD_DIR)/bin
IMG := $(BIN_DIR)/kernel8.img
ELF := $(BIN_DIR)/kernel8.elf
SRC := $(wildcard $(SRC_DIR)/*.c)
OBJ := $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
DEP := $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.d)
ASM_SRC := $(wildcard $(SRC_DIR)/*.s)
ASM_OBJ := $(ASM_SRC:$(SRC_DIR)/%.s=$(OBJ_DIR)/%.o)
LINK := $(SRC_DIR)/link.ld
CPPFLAGS := -MMD -MP -I$(TOOLCHAIN_LIB) -I$(SRC_DIR)
CFLAGS := -Wall -Wextra -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
LDFLAGS := -nostdlib
.PHONY: all clean
all: $(IMG)
$(IMG): $(ELF) | $(BIN_DIR)
@echo Building $@
$(OBJCOPY) -O binary $(ELF) $@
$(ELF): $(OBJ) $(ASM_OBJ) | $(BIN_DIR)
@echo Building $@
$(LD) $(LDFLAGS) $^ -T $(LINK) -o $@
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
@echo Building $< "->" $@
$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.s | $(BUILD_DIR)
@echo Building $< "->" $@
$(AS) $< -o $@
clean:
rm -rf $(BUILD_DIR)
$(BUILD_DIR):
mkdir -p $(BUILD_DIR)
$(BIN_DIR):
mkdir -p $(BIN_DIR)
-include $(DEP)
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