Makefile

RISCV_PREFIX ?= riscv64-elf-
# 若默认前缀不可用（旧环境），回退到 riscv-none-elf-
ifeq (, $(shell command -v $(RISCV_PREFIX)gcc 2>/dev/null))
RISCV_PREFIX := riscv-none-elf-
endif
CC            = $(RISCV_PREFIX)gcc
OBJCOPY       = $(RISCV_PREFIX)objcopy

ARCH_DIR      = arch/riscv
KERNEL_DIR    = kernel
BUILD_DIR     = build

CFLAGS        = -march=rv64imac_zicsr -mabi=lp64 -mcmodel=medany
CFLAGS       += -nostdlib -ffreestanding -fno-builtin -fno-stack-protector
CFLAGS       += -Wall -Wextra -Werror
CFLAGS       += -I$(KERNEL_DIR)/include -I$(ARCH_DIR)/include

LDFLAGS       = -T linker.ld -nostdlib -z max-page-size=4096

SRCS_C        = \
	$(KERNEL_DIR)/main.c \
	$(KERNEL_DIR)/handle.c \
	$(KERNEL_DIR)/trap/trap.c \
	$(KERNEL_DIR)/syscall/syscall.c \
	$(KERNEL_DIR)/fs/namesvc.c \
	$(KERNEL_DIR)/fs/ramfs.c \
	$(KERNEL_DIR)/dev/plic.c \
	$(KERNEL_DIR)/dev/virtio_blk.c \
	$(KERNEL_DIR)/proc.c \
	$(KERNEL_DIR)/idle.c \
	$(KERNEL_DIR)/mm/kalloc.c \
	$(KERNEL_DIR)/mm/vm.c \
	$(KERNEL_DIR)/async/async.c \
	$(ARCH_DIR)/sbi.c \
	$(ARCH_DIR)/mmu/sv39.c

SRCS_S        = \
	$(ARCH_DIR)/boot/start.S \
	$(ARCH_DIR)/boot/trap.S

OBJS          = $(SRCS_C:%.c=$(BUILD_DIR)/%.o) \
	            $(SRCS_S:%.S=$(BUILD_DIR)/%.o)

TARGET_ELF    = $(BUILD_DIR)/kernel.elf
TARGET_BIN    = $(BUILD_DIR)/kernel.bin

.PHONY: all clean dirs

all: dirs $(TARGET_BIN)

DIRS := \
	$(BUILD_DIR) \
	$(BUILD_DIR)/arch/riscv/boot \
	$(BUILD_DIR)/arch/riscv/mmu \
	$(BUILD_DIR)/kernel/trap \
	$(BUILD_DIR)/kernel/mm \
	$(BUILD_DIR)/kernel/dev \
	$(BUILD_DIR)/kernel/fs \
	$(BUILD_DIR)/kernel/async \
	$(BUILD_DIR)/kernel/syscall

dirs:
	@mkdir -p $(DIRS)

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

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

$(TARGET_ELF): $(OBJS) linker.ld
	$(CC) $(CFLAGS) $(OBJS) $(LDFLAGS) -o $@

$(TARGET_BIN): $(TARGET_ELF)
	$(OBJCOPY) -O binary $< $@

clean:
	rm -rf $(BUILD_DIR)