K=kernel M=mkfs U=user P=programs # riscv64-unknown-elf- or riscv64-linux-gnu- # perhaps in /opt/riscv/bin #TOOLPREFIX = # Try to infer the correct TOOLPREFIX if not set ifndef TOOLPREFIX TOOLPREFIX := $(shell if riscv64-unknown-elf-objdump -i 2>&1 | grep 'elf64-big' >/dev/null 2>&1; \ then echo 'riscv64-unknown-elf-'; \ elif riscv64-linux-gnu-objdump -i 2>&1 | grep 'elf64-big' >/dev/null 2>&1; \ then echo 'riscv64-linux-gnu-'; \ elif riscv64-unknown-linux-gnu-objdump -i 2>&1 | grep 'elf64-big' >/dev/null 2>&1; \ then echo 'riscv64-unknown-linux-gnu-'; \ else echo "***" 1>&2; \ echo "*** Error: Couldn't find a riscv64 version of GCC/binutils." 1>&2; \ echo "*** To turn off this error, run 'gmake TOOLPREFIX= ...'." 1>&2; \ echo "***" 1>&2; exit 1; fi) endif QEMU = qemu-system-riscv64 CC = $(TOOLPREFIX)gcc AS = $(TOOLPREFIX)gas LD = $(TOOLPREFIX)ld OBJCOPY = $(TOOLPREFIX)objcopy OBJDUMP = $(TOOLPREFIX)objdump CFLAGS = -Wall -Werror -O -fno-omit-frame-pointer -ggdb -gdwarf-2 CFLAGS += -MD CFLAGS += -mcmodel=medany CFLAGS += -ffreestanding -fno-common -nostdlib -mno-relax CFLAGS += -I. CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector) # Disable PIE when possible (for Ubuntu 16.10 toolchain) ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]no-pie'),) CFLAGS += -fno-pie -no-pie endif ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]nopie'),) CFLAGS += -fno-pie -nopie endif LDFLAGS = -z max-page-size=4096 .PHONY: build kernel ulib mkfs clean build: kernel fs.img kernel: $(MAKE) -C $K ulib: $(MAKE) -C $U mkfs: $(MAKE) -C $M USERLIBS = $U/ulib.o $U/usys.o $U/printf.o $U/umalloc.o %.o: %.c *.h $(CC) $(CFLAGS) -c $< _%: %.o ulib $(LD) $(LDFLAGS) -T $U/user.ld -o $@ $< $(USERLIBS) # $(OBJDUMP) -S $@ > $*.asm # $(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $*.sym $U/_forktest: $U/forktest.o ulib # forktest has less library code linked in - needs to be small # in order to be able to max out the proc table. $(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $U/_forktest $U/forktest.o $U/ulib.o $U/usys.o # $(OBJDUMP) -S $U/_forktest > $U/forktest.asm # Prevent deletion of intermediate files, e.g. cat.o, after first build, so # that disk image changes after first build are persistent until clean. More # details: # http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html .PRECIOUS: %.o UPROGS=\ $P/_cat\ $P/_echo\ $P/_forktest\ $P/_grep\ $P/_grind\ $P/_init\ $P/_kill\ $P/_ln\ $P/_ls\ $P/_mkdir\ $P/_rm\ $P/_sh\ $P/_stressfs\ $P/_usertests\ $P/_wc\ $P/_zombie\ $P/_shutdown\ fs.img: mkfs README $(UPROGS) mkfs/mkfs fs.img README $(UPROGS) -include kernel/*.d user/*.d clean: $(MAKE) -C $K clean $(MAKE) -C $M clean $(MAKE) -C $U clean rm -f *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \ */*.o */*.a */*.d */*.asm */*.sym fs.img .gdbinit \ $(UPROGS) # try to generate a unique GDB port GDBPORT = $(shell expr `id -u` % 5000 + 25000) # QEMU's gdb stub command line changed in 0.11 QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \ then echo "-gdb tcp::$(GDBPORT)"; \ else echo "-s -p $(GDBPORT)"; fi) ifndef CPUS CPUS := 3 endif QEMUOPTS = -machine virt -bios none -kernel kernel/kernel -m 128M -smp $(CPUS) -nographic QEMUOPTS += -global virtio-mmio.force-legacy=false QEMUOPTS += -drive file=fs.img,if=none,format=raw,id=x0 QEMUOPTS += -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0 qemu: kernel fs.img $(QEMU) $(QEMUOPTS) .gdbinit: .gdbinit.tmpl-riscv sed "s/:1234/:$(GDBPORT)/" < $^ > $@ qemu-gdb: kernel .gdbinit fs.img @echo "*** Now run 'gdb' in another window." 1>&2 $(QEMU) $(QEMUOPTS) -S $(QEMUGDB)