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https://github.com/gbowne1/ClassicOS.git
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59 lines
1.9 KiB
Makefile
59 lines
1.9 KiB
Makefile
AS = nasm
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ASFLAGS = -f elf32 -g -F dwarf
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CC = gcc
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LD = ld
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QEMU= qemu-system-i386
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BUILD_DIR = build
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DISK_IMG = $(BUILD_DIR)/disk.img
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STAGE2_SIZE = 2048
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KERNEL_C_SRC = $(wildcard kernel/*.c)
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KERNEL_ASM_SRC = $(wildcard kernel/*.asm)
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KERNEL_OBJ = $(patsubst kernel/%.c, $(BUILD_DIR)/%.o, $(KERNEL_C_SRC))
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KERNEL_OBJ += $(patsubst kernel/%.asm, $(BUILD_DIR)/asm_%.o, $(KERNEL_ASM_SRC))
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all: $(DISK_IMG)
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.PHONY: stage1 stage2 kernel run gdb clean
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stage1: $(BUILD_DIR)
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$(AS) $(ASFLAGS) -o $(BUILD_DIR)/$@.o bootloader/$@.asm
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$(LD) -Ttext=0x7c00 -melf_i386 -o $(BUILD_DIR)/$@.elf $(BUILD_DIR)/$@.o
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objcopy -O binary $(BUILD_DIR)/$@.elf $(BUILD_DIR)/$@.bin
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# NOTE: Stage2 final size should be checked against `$(STAGE2_SIZE)` by the build system to avoid an overflow.
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# Alternatively, convey the final stage2 size through other means to stage1.
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stage2: $(BUILD_DIR)
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$(AS) $(ASFLAGS) -o $(BUILD_DIR)/stage2.o bootloader/stage2.asm
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$(CC) -std=c11 -ffreestanding -nostdlib -fno-stack-protector -m32 -g -c -o $(BUILD_DIR)/stage2_load.o bootloader/stage2_load.c
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$(LD) -Tbootloader/stage2.ld -melf_i386 -o $(BUILD_DIR)/$@.elf $(BUILD_DIR)/stage2.o $(BUILD_DIR)/stage2_load.o
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objcopy -O binary $(BUILD_DIR)/$@.elf $(BUILD_DIR)/$@.bin
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truncate -s $(STAGE2_SIZE) $(BUILD_DIR)/$@.bin
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$(BUILD_DIR)/asm_%.o: kernel/%.asm
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$(AS) $(ASFLAGS) -o $@ $<
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$(BUILD_DIR)/%.o: kernel/%.c
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$(CC) -std=c11 -ffreestanding -nostdlib -fno-stack-protector -m32 -g -c -o $@ $<
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kernel: $(KERNEL_OBJ) | $(BUILD_DIR)
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$(LD) -melf_i386 -Tbootloader/linker.ld -o $(BUILD_DIR)/kernel.elf $(KERNEL_OBJ)
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$(DISK_IMG): stage1 stage2 kernel
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dd if=$(BUILD_DIR)/stage1.bin of=$@
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dd if=$(BUILD_DIR)/stage2.bin of=$@ oflag=append conv=notrunc
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dd if=$(BUILD_DIR)/kernel.elf of=$@ oflag=append conv=notrunc
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truncate -s 1M $@
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$(BUILD_DIR):
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mkdir -p $@
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run:
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qemu-system-i386 -s -S $(DISK_IMG)
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gdb:
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gdb -x gdb.txt
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clean:
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rm -rf $(BUILD_DIR)
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