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|
CC = clang
LD = ld.lld
OBJCOPY = llvm-objcopy
ARCH_FLAG = \
--target=riscv32-unknown-elf \
-march=rv32im \
-mabi=ilp32 \
-D__SYS_LITTLE_ENDIAN__
COMMON_FLAGS = \
-ffreestanding \
-fno-builtin \
-fno-stack-protector \
-fno-exceptions \
-fno-rtti \
-fno-unwind-tables \
-fno-asynchronous-unwind-tables \
-nostdlib \
-nostdinc \
-nodefaultlibs \
KERNEL_FLAG = $(COMMON_FLAGS) -static
MODULE_FLAG = $(COMMON_FLAGS) -fPIC -fpie
SECTION_FLAG = \
-ffunction-sections \
-fdata-sections \
-fno-common
INCLUDE_FLAG = -Iinclude -Ikernel
OPT_FLAG = -O2 -g3
WARN_FLAG = -Wall -Wextra -Werror -Wundef
KERNEL_LD_FLAG = -T linker.ld -fuse-ld=lld -Wl,-nostdlib -Wl,-melf32lriscv -Wl,--gc-sections -Wl,-Map=$(MAP_FILE)
MODULE_LD_FLAG = -fuse-ld=lld -Wl,-nostdlib -Wl,-shared -Wl,-melf32lriscv -Wl,--gc-sections
KERNEL_OBJCOPY_FLAG = -O binary \
--strip-all \
--remove-section=.comment \
--remove-section=.debug* \
--remove-section=.note* \
--remove-section=.eh_frame \
--remove-section=.eh_frame_ptr \
--remove-section=.eh_frame_hdr
MODULE_OBJCOPY_FLAG = \
--strip-debug \
--remove-section=.comment \
--remove-section=.note*
KERNEL_CFLAGS = $(ARCH_FLAG) $(KERNEL_FLAG) $(SECTION_FLAG) $(INCLUDE_FLAG) $(OPT_FLAG) $(WARN_FLAG)
MODULE_CFLAGS = $(ARCH_FLAG) $(MODULE_FLAG) $(SECTION_FLAG) $(INCLUDE_FLAG) $(OPT_FLAG) $(WARN_FLAG) -D__KERNEL_MODULE__
INCLUDE_DIR = include
KERNEL_DIR = kernel
OBJ_DIR = out/objects
BIN_DIR = out/bin
MODULE_BIN_DIR = out/modules
MODULES = $(filter-out kernel include out, $(shell find . -maxdepth 1 -type d -printf "%f\n" | grep -v "^\."))
MODULE_OBJ_DIR = $(addprefix $(OBJ_DIR)/, $(MODULES))
KERNEL_OBJ_DIR = $(OBJ_DIR)/kernel
KERNEL_C_SRCS = $(wildcard kernel/*.c)
KERNEL_ASM_SRCS = $(wildcard kernel/*.S)
KERNEL_C_OBJS = $(addprefix $(OBJ_DIR)/kernel/, $(notdir $(KERNEL_C_SRCS:.c=.o)))
KERNEL_ASM_OBJS = $(addprefix $(OBJ_DIR)/kernel/, $(notdir $(KERNEL_ASM_SRCS:.S=.o)))
KERNEL_OBJS = $(KERNEL_C_OBJS) $(KERNEL_ASM_OBJS)
define module_template
MODULE_$(1)_C_SRCS = $$(wildcard $(1)/*.c)
MODULE_$(1)_ASM_SRCS = $$(wildcard $(1)/*.S)
MODULE_$(1)_C_OBJS = $$(addprefix $(OBJ_DIR)/$(1)/, $$(notdir $$(MODULE_$(1)_C_SRCS:.c=.o)))
MODULE_$(1)_ASM_OBJS = $$(addprefix $(OBJ_DIR)/$(1)/, $$(notdir $$(MODULE_$(1)_ASM_SRCS:.S=.o)))
MODULE_$(1)_OBJS = $$(MODULE_$(1)_C_OBJS) $$(MODULE_$(1)_ASM_OBJS)
MODULE_$(1)_KO = $(MODULE_BIN_DIR)/$(1).ko
endef
$(foreach module,$(MODULES),$(eval $(call module_template,$(module))))
ALL_MODULES = $(foreach module,$(MODULES),$(MODULE_BIN_DIR)/$(module).ko)
KERNEL_ELF = $(BIN_DIR)/wkern.elf
KERNEL_BIN = $(BIN_DIR)/wkern.bin
MAP_FILE = $(BIN_DIR)/kernel.map
ALL_MOODULES = $(foreach module,$(MODULES),$(MODULE_BIN_DIR)/$(module).ko)
MODULE_OBJ_DIRS = $(addprefix $(OBJ_DIR)/, $(MODULES))
ALL_DIRS = $(OBJ_DIR)/kernel $(MODULE_OBJ_DIRS) $(BIN_DIR) $(MODULE_BIN_DIR)
.PHONY: all clean kernel modules $(MODULES)
all: kernel modules
kernel: $(KERNEL_BIN)
modules: $(ALL_MODULES)
$(MODULES): %: $(MODULE_BIN_DIR)/%.ko
$(OBJ_DIR)/kernel/%.o: $(KERNEL_DIR)/%.c | $(OBJ_DIR)/kernel
@echo " CC $<"
$(CC) $(KERNEL_CFLAGS) -c $< -o $@
$(OBJ_DIR)/kernel/%.o: $(KERNEL_DIR)/%.S | $(OBJ_DIR)/kernel
@echo " AS $<"
$(CC) $(KERNEL_CFLAGS) -c $< -o $@
$(KERNEL_ELF): $(KERNEL_OBJS) linker.ld | $(BIN_DIR)
@echo " LD $@"
$(CC) $(KERNEL_CFLAGS) $(KERNEL_LD_FLAG) $(KERNEL_OBJS) -o $@
$(KERNEL_BIN): $(KERNEL_ELF) | $(BIN_DIR)
@echo " OBJCOPY $@"
$(OBJCOPY) $(KERNEL_OBJCOPY_FLAG) $(KERNEL_ELF) $(KERNEL_BIN)
$(OBJ_DIR)/%.o: %.c# | $(OBJ_DIR)/%
@mkdir -p $(dir $@)
@echo " CC $@"
$(CC) $(MODULE_CFLAGS) -c $< -o $@
$(OBJ_DIR)/%.o: %.S# | $(OBJ_DIR)/%
@mkdir -p $(dir $@)
@echo " AS $@"
$(CC) $(MODULE_CFLAGS) -c $< -o $@
define module_link_rule
$(MODULE_BIN_DIR)/$(1).ko: $$(MODULE_$(1)_OBJS) | $(MODULE_BIN_DIR)
@echo " LD $$@"
$$(CC) $$(MODULE_CFLAGS) $$(MODULE_LD_FLAG) $$^ -o $$@
$$(OBJCOPY) $$(MODULE_OBJCOPY_FLAG) $$@ $$@
endef
$(foreach module,$(MODULES),$(eval $(call module_link_rule,$(module))))
$(ALL_DIRS):
mkdir -p $@
clean:
rm -rf out
|
