doom/Makefile at main · kosude/doom · GitHub

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UNAME := $(shell uname)# doesn't work on Windows, but obviously we don't care

BUILD_DIR := build
OBJ_DIR := $(BUILD_DIR)/obj
BIN_DIR := $(BUILD_DIR)/bin

SCRIPTS_DIR := scripts

INC_DIRS := kernel/include game/include

AS := nasm
# TODO: cross-compiled ld
ifeq ($(UNAME),Darwin)
# GNU ld doesn't exist on macoS
LD := x86_64-elf-ld
else
LD := ld
endif
OBJCOPY := objcopy
DD := dd

ASFLAGS := -felf32 $(addprefix -I,$(INC_DIRS))
LDFLAGS := -nostdlib -melf_i386 -static -n

BSRC_DIRS := \
	boot/src
KSRC_DIRS := \
	arch/i386 \
	game/src \
	game/src/renderer \
	kernel/src \
	kernel/src/drivers/vga

BSRCS := $(shell find $(BSRC_DIRS) -name "*.asm")
BOBJS := $(BSRCS:%=$(OBJ_DIR)/%.o)
KSRCS := $(shell find $(KSRC_DIRS) -name "*.asm")
KOBJS := $(KSRCS:%=$(OBJ_DIR)/%.o)

OBJ_SUBDIRS := \
	$(addsuffix /,$(addprefix $(OBJ_DIR)/,$(BSRC_DIRS))) \
	$(addsuffix /,$(addprefix $(OBJ_DIR)/,$(KSRC_DIRS)))

# run with DEBUG=1 to use debug configuration
ifeq "$(DEBUG)" "1"
ASFLAGS += -g -Fdwarf -D_DEBUG
else
LDFLAGS += -s
endif

.PHONY: all
all: $(BUILD_DIR)/doom.iso $(OBJ_SUBDIRS)

.PHONY: clean
clean:
	rm -rf $(BUILD_DIR)
	rm -rf kernel/include/isr_definitions.inc

.PHONY: rebuild
rebuild:
	$(MAKE) clean
	$(MAKE) all

# assemble unlinked machine code objects
$(OBJ_DIR)/%.asm.o: %.asm kernel/include/isr_definitions.inc | $(OBJ_SUBDIRS)
	$(AS) $(ASFLAGS) -o $@ $<

# link bootloader ELF32 binary
$(BIN_DIR)/boot.elf: $(BOBJS) | $(BIN_DIR)
	$(LD) $(LDFLAGS) -Tboot/linker.ld -o $@ $^
# translate bootloader from ELF32 to raw/flat binary
$(BIN_DIR)/boot.bin: $(BIN_DIR)/boot.elf
	$(OBJCOPY) --gap-fill=0 -Obinary $< $@

# link kernel ELF32 binary
$(BIN_DIR)/kernel.elf: $(KOBJS) | $(BIN_DIR)
	$(LD) $(LDFLAGS) -Tkernel/linker.ld -o $@ $^
# translate kernel from ELF32 to raw/flat binary
$(BIN_DIR)/kernel.bin: $(BIN_DIR)/kernel.elf
	$(OBJCOPY) --gap-fill=0 -Obinary $< $@

# generate bootable disk image with bootloader and kernel
$(BUILD_DIR)/doom.iso: $(BIN_DIR)/boot.bin $(BIN_DIR)/kernel.bin
	$(DD) if=/dev/zero of=$@ bs=512 count=16

	$(DD) if=$(BIN_DIR)/boot.bin of=$@ seek=0 count=1 conv=notrunc
	$(DD) if=$(BIN_DIR)/kernel.bin of=$@ seek=1 count=15 conv=notrunc

# generate ISR stub definitions file
kernel/include/isr_definitions.inc: $(SCRIPTS_DIR)/isr_gen.sh
	./$< &> $@

# director(y/ies)
$(BIN_DIR):
	mkdir -p $@
$(OBJ_DIR)/%/: %
	mkdir -p $@