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ARCH = x86_64-elf-
CC = $(ARCH)gcc
AS = $(ARCH)as
LD = $(ARCH)ld
OBJDUMP = $(ARCH)objcopy
OBJCOPY = $(ARCH)objdump
CFLAGS = -Wall -Werror -Wno-error=infinite-recursion -O -fno-omit-frame-pointer
# -mgeneral-regs-only disables SIMD instructions
CFLAGS += -MD -O3 -mgeneral-regs-only
CFLAGS += -ffreestanding -fno-common -nostdlib
CFLAGS += -I include
CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
CFLAGS += -fno-pie -no-pie -fno-pic
LDFLAGS = -z max-page-size=4096
K=kernel
OBJS = \
$K/header.o \
$K/boot.o \
$K/boot64.o \
$K/main.o \
$K/graphics.o \
$K/multiboot2.o \
$K/debug.o \
kernel.iso: kernel.bin $K/grub.cfg
mkdir -p isodir/boot/grub
cp kernel.bin isodir/boot/kernel.bin
cp $K/grub.cfg isodir/boot/grub/grub.cfg
grub-mkrescue -o kernel.iso isodir
kernel.bin: $(OBJS) $K/kernel.ld Makefile
$(LD) $(LDFLAGS) -T $K/kernel.ld $(OBJS) -o kernel.bin
%.o: %.c
$(CC) $(CFLAGS) -c $< -o $@
%.o: %.S
$(CC) $(CFLAGS) -c $< -o $@
.PHONY: qemu clean run
QEMU = qemu-system-x86_64
QEMUFLAGS =
qemu: kernel.iso
$(QEMU) $(QEMUFLAGS) -cdrom kernel.iso
clean:
rm -f kernel.bin kernel.iso $K/*.o $K/*.d xbochs.log bx_enh_dbg.ini
rm -rf isodir
run: qemu
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