TOOLCHAIN = riscv64-linux-gnu-
QEMU=qemu-system-riscv64
KERNEL = kernel.elf

CFLAGS=-march=rv64i_zicsr_d -mabi=lp64d -Wall -Wextra -Werror -O2 -Iinclude -g
LDFLAGS=-T linker.ld --no-dynamic-linker -m elf64lriscv -static -nostdlib
QEMUFLAGS=-nographic -serial mon:stdio --no-reboot

CFILES = $(shell find -L -type f -name "*.c")
SFILES = $(shell find -L -type f -iname "*.s")
OBJ := $(addsuffix .o,$(CFILES)) $(addsuffix .o,$(SFILES))

$(KERNEL): $(OBJ) linker.ld
	${TOOLCHAIN}ld $(LDFLAGS) -o $(KERNEL) $(OBJ)

%.c.o: %.c
	$(TOOLCHAIN)gcc $(CFLAGS) -o $@ -c $<

%.s.o: %.s
	$(TOOLCHAIN)gcc $(CFLAGS) -o $@ -c $<

%.S.o: %.S
	$(TOOLCHAIN)gcc $(CFLAGS) -o $@ -c $<

run: $(KERNEL)
	qemu-system-riscv64 $(QEMUFLAGS) -kernel $(KERNEL)

run-debug: $(KERNEL)
	$(QEMU) -monitor none -s -S -kernel $(KERNEL) &
	$(TOOLCHAIN)gdb $(KERNEL) -q -ex "target remote :1234" -ex "b *_start" -ex "c" -tui
	killall $(QEMU)

clean:
	@rm $(OBJ) $(KERNEL)