diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..387810e --- /dev/null +++ b/Makefile @@ -0,0 +1,113 @@ +## +# By default everything is silent. If you want to change this behavior, simply +# assign V=1 when calling make. + +V = +ifeq ($(strip $(V)),) + E = @echo + Q = @ +else + E = @\# + Q = +endif + +## +# Paths. + +SRC = $(wildcard src/*.S src/*.c) +OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(SRC))) +EXE = init +ARCH = riscv +LINUX_SOURCE ?= +KERNEL = $(LINUX_SOURCE)/arch/$(ARCH)/boot/Image + +## +# Compile options. You can use CROSS_COMPILE just like on the Linux Kernel. You +# can also determine the ISA to be used, which defaults to my VisionFive2 board. +# I did not go too much into the rabbit hole of platform-specific flags because +# everything is in assembly anyways and everything is statically linked. Hence +# no `-mcpu`, no `-mtune`, no funny business. + +CC = $(CROSS_COMPILE)gcc +LD = $(CROSS_COMPILE)gcc +ISA ?= rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb +INCLUDES = -Iinclude/ +ASFLAGS = -march=$(ISA) -mabi=lp64d $(INCLUDES) +CCFLAGS = $(ASFLAGS) -std=gnu17 +WARNINGS = -Werror -Wall -Wextra -Wcast-align -Wcast-qual -Winit-self \ + -Wmissing-include-dirs -Wredundant-decls -Wshadow -Wsign-conversion \ + -Wswitch-default -Wundef -Wunreachable-code +CCFLAGS += $(WARNINGS) +LDFLAGS = -static $(INCLUDES) + +## +# Optional parameters for QEMU and gdb. + +QEMU_FLAGS ?= +GDB_EXTRA_FLAGS ?= + +# You can pass an optional `DEBUG` variable to manipulate the build type. +DEBUG ?= +ifeq ($(strip $(DEBUG)),) + CCFLAGS += -O3 +else + CCFLAGS += -g -O0 -D__DEBUG__ +endif + +# Image being mounted for QEMU's consumption. +MOUNT_DEST_DIR ?= /mnt/pudc +MOUNT_DEST_IMG ?= disk.img + +## +# Targets + +.PHONY: all +all: clean $(EXE) + +.PHONY: $(EXE) +$(EXE): $(OBJ) + $(E) " LD " $@ + $(Q) $(LD) $(LDFLAGS) $+ -o $(EXE) + +.c.o: + $(E) " CC " $(basename $@) + $(Q) $(CC) $(CCFLAGS) -c $< -o $@ + +.S.o: + $(E) " CC " $(*F) + $(Q) $(CC) $(ASFLAGS) -c $< -o $@ + +# Ensure that we have LINUX_SOURCE defined. +.PHONY: qemu_env +qemu_env: + $(if $(wildcard $(LINUX_SOURCE)),,$(error The 'LINUX_SOURCE' environment variable must be set to a non-empty value.)) + +# Insert the built $(EXE) into the image to be mounted via QEMU. +.PHONY: qemu_prepare_disk +qemu_prepare_disk: + $(E) " DISK $(MOUNT_DEST_IMG)" + $(Q) sudo mkdir -p $(MOUNT_DEST_DIR) + $(Q) sudo mount -o loop $(MOUNT_DEST_IMG) $(MOUNT_DEST_DIR) + $(Q) sudo mkdir -p $(MOUNT_DEST_DIR)/bin/ $(MOUNT_DEST_DIR)/dev/ \ + $(MOUNT_DEST_DIR)/etc/ $(MOUNT_DEST_DIR)/proc/ $(MOUNT_DEST_DIR)/run/pudc/ \ + $(MOUNT_DEST_DIR)/sbin/ $(MOUNT_DEST_DIR)/sys/ $(MOUNT_DEST_DIR)/tmp/ + $(Q) sudo cp $(EXE) $(MOUNT_DEST_DIR)/sbin/$(EXE) + $(Q) sudo umount $(MOUNT_DEST_DIR) + +# Run QEMU by using the built $(KERNEL) and the $(MOUNT_DEST_IMG), which +# contains the $(EXE) binary as '/sbin/init'. +.PHONY: qemu +qemu: qemu_env $(EXE) qemu_prepare_disk + $(E) " QEMU kernel=$(KERNEL)" + $(Q) qemu-system-riscv64 -machine virt -smp 4 -m 8G -kernel $(KERNEL) \ + -nographic $(QEMU_FLAGS) \ + -drive file=$(MOUNT_DEST_IMG),format=raw,if=virtio \ + -append "root=/dev/vda rw console=ttyS0" + +.PHONY: clean +clean: + $(Q) rm -f $(OBJ) $(EXE) + +.PHONY: lint +lint: + $(Q) git ls-files *.c *.h | xargs clang-format --dry-run --Werror |