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##
# 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
##
# 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. Hence
# no `-mcpu`, no `-mtune`, no funny business.
CC = $(CROSS_COMPILE)gcc$(CC_SUFFIX)
LD = $(CROSS_COMPILE)ld
QEMU ?= qemu-system-riscv64
ISA ?= rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb
ASFLAGS = -march=$(ISA) -mabi=lp64d -mcmodel=medany
CCFLAGS = $(ASFLAGS) -Iinclude/
CCFLAGS += -Werror -Wpedantic -Wall -Wextra -Wcast-align -Wcast-qual -Winit-self \
-Wmissing-include-dirs -Wredundant-decls -Wshadow -Wsign-conversion \
-Wswitch-default -Wundef -Wunreachable-code \
-nostdinc -nostdlib -std=gnu17
LDFLAGS = -Iinclude/ -static -melf64lriscv -z noexecstack
USRFLAGS = -static -melf64lriscv
##
# Optional parameters for QEMU and gdb.
QEMU_FLAGS ?=
QEMU_BIOS ?=
GDB_EXTRA_FLAGS ?=
##
# You can pass an optional `DEBUG` variable to manipulate the build type. This
# will also affect how QEMU is run.
DEBUG =
ifeq ($(strip $(DEBUG)),)
CCFLAGS += -O3
QEMU_FLAGS += -nographic
else
ASFLAGS += -g
CCFLAGS += -g
QEMU_FLAGS += -s -S
endif
##
# Paths
SRC = $(filter-out kernel/fbos.ld.S, $(wildcard kernel/*.S kernel/*.c))
OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(SRC)))
LINKER = kernel/fbos.ld
KRNL = fbos
USR = usr/bin/foo
INIT = usr/initramfs.cpio
LDFLAGS += -T $(LINKER)
##
# Kernel
.PHONY: all
all: clean $(KRNL) usr
.PHONY: $(KRNL)
$(KRNL): $(OBJ) $(LINKER).S
$(Q) $(CC) -E $(LINKER).S -Iinclude/ -o $(LINKER)
$(E) " LD " $@
$(Q) $(LD) $(LDFLAGS) $(OBJ) -o $(KRNL)
.c.o:
$(E) " CC " $(*F)
$(Q) $(CC) $(CCFLAGS) -c $< -o $@
.S.o:
$(E) " CC " $(*F)
$(Q) $(CC) $(CCFLAGS) -D__ASSEMBLY__ -c $< -o $@
##
# User space
.PHONY: usr
usr: $(USR)
$(E) " CPIO " $(INIT)
$(Q) find usr/bin/ -type f -executable | cpio -o --quiet -H newc > $(INIT)
usr/src/%.o: usr/src/%.S
$(E) " CC " $(basename $@)
$(Q) $(CC) $(ASFLAGS) -D__ASSEMBLY__ -c $< -o $@
usr/bin/%: usr/src/%.o
$(Q) mkdir -p usr/bin/
$(E) " LD " $@
$(Q) $(LD) $(USRFLAGS) $< -o $@
# HACK: do not remove object files from usr/src/.
.SECONDARY:
##
# Hacking
.PHONY: qemu
qemu: $(KRNL) usr
ifeq ($(strip $(QEMU_BIOS)),)
$(Q) $(QEMU) $(QEMU_FLAGS) -machine virt -kernel $(KRNL) -initrd $(INIT)
else
$(Q) $(QEMU) $(QEMU_FLAGS) -machine virt -bios $(QEMU_BIOS) -kernel $(KRNL) -initrd $(INIT)
endif
.PHONY: gdb
gdb:
$(Q) gdb --command utils/init.gdb $(GDB_EXTRA_FLAGS) $(KRNL)
.PHONY: clean
clean:
$(Q) rm -f $(OBJ) $(KRNL) $(LINKER) $(USR) usr/src/*.o $(INIT)
.PHONY: lint
lint:
$(Q) git ls-files *.c *.h | xargs clang-format --dry-run --Werror
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