53 lines
1.5 KiB
Makefile
53 lines
1.5 KiB
Makefile
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C_SOURCES = $(wildcard kernel/*.c drivers/*.c)
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HEADERS = $(wildcard kernel/*.h drivers/*.h)
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# Nice syntax for file extension replacement
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OBJ = ${C_SOURCES:.c=.o}
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# Change this if your cross-compiler is somewhere else
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CC = /usr/bin/gcc
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GDB = /usr/bin/gdb
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# -g: Use debugging symbols in gcc
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CFLAGS = -g -m32 -fno-pie -ffreestanding
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# First rule is run by default
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all: run
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# concatanate the binary files to make kernel image
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os-image.bin: boot/bootsect.bin kernel.bin
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cat $^ > os-image.bin
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# '--oformat binary' deletes all symbols as a collateral, so we don't need
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# to 'strip' them manually on this case
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kernel.bin: boot/kernel_entry.o ${OBJ}
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/usr/bin/ld -m elf_i386 -o $@ -Ttext 0x1000 $^ --oformat binary
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# Used for debugging purposes
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kernel.elf: boot/kernel_entry.o ${OBJ}
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/usr/bin/ld -m elf_i386 -o $@ -Ttext 0x1000 $^
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run: os-image.bin
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qemu-system-i386 -vga std -drive file=$<,index=0,if=floppy,format=raw
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curses: os-image.bin
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qemu-system-i386 -curses -drive file=$<,index=0,if=floppy,format=raw
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# Open the connection to qemu and load our kernel-object file with symbols
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debug: os-image.bin kernel.elf
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qemu-system-i386 -curses -s -drive file=os-image.bin,index=0,if=floppy,format=raw &
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${GDB} -ex "target remote localhost:1234" -ex "symbol-file kernel.elf"
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# Generic rules for wildcards
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# To make an object, always compile from its .c
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%.o: %.c ${HEADERS}
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${CC} ${CFLAGS} -c $< -o $@
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%.o: %.asm
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nasm $< -f elf -o $@
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%.bin: %.asm
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nasm $< -f bin -o $@
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clean:
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rm -rf *.bin *.dis *.o os-image.bin *.elf
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rm -rf kernel/*.o boot/*.bin drivers/*.o boot/*.o
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