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|
DO != echo -n > deps.mk
# this could be done better
DEBUGFLAGS != [ $(RELEASE) ] \
&& echo "-flto -O2 -g -DNDEBUG" \
|| echo "-O0 -g -DDEBUG"
CFLAGS = -ffreestanding -nostdlib -std=c17 -Wall -Wextra -Wvla
DEPFLAGS = -MT $@ -MMD -MP -MF $@.d
LINTFLAGS = -fsyntax-only
PREPROCESS = -E
LDFLAGS != [ $(LLVM) ] \
|| echo -static-libgcc -lgcc
BUILD = build
ARCH_BUILD = $(BUILD)/arch/$(ARCH)
ARCH_SOURCE = arch/$(ARCH)
all: apos.bin
# default values, overwrite if/when needed
ARCH ?= riscv64
CROSS_COMPILE ?= $(ARCH)-unknown-elf
OBJCOPY != [ $(LLVM) ] \
&& echo llvm-objcopy \
|| echo $(CROSS_COMPILE)-objcopy
COMPILER != [ $(LLVM) ] \
&& echo clang --target="$(CROSS_COMPILE)" \
|| echo $(CROSS_COMPILE)-gcc
KERNEL_SOURCES != echo common/*.c common/uapi/*.c lib/*.c
CLEANUP := build deps.mk kernel.* init.* apos.bin
CLEANUP_CMD :=
INIT_SOURCES :=
include arch/$(ARCH)/source.mk
COMPILE_FLAGS := $(CFLAGS) $(ARCH_CFLAGS)
LINK_FLAGS := $(LDFLAGS) $(ARCH_LDFLAGS)
INCLUDE_FLAGS := -I include -I arch/$(ARCH)/include\
-include config.h -include arch/$(ARCH)/config.h
# This makes sure .bss is loaded into the binary
OBJCOPY_FLAGS ?= -Obinary --set-section-flags .bss=alloc,load,contents
COMPILE = $(COMPILER) $(DEBUGFLAGS)\
$(COMPILE_FLAGS) $(DEPFLAGS) $(INCLUDE_FLAGS)
LINT = $(COMPILER) $(DEBUGFLAGS)\
$(COMPILE_FLAGS) $(LINTFLAGS) $(INCLUDE_FLAGS)
GENELF = $(COMPILER) $(DEBUGFLAGS)\
$(COMPILE_FLAGS) $(INCLUDE_FLAGS)
GENLINK = $(COMPILER) $(COMPILE_FLAGS) $(PREPROCESS) $(DEPFLAGS) $(INCLUDE_FLAGS)
STRIPLINK = sed -n '/^[^\#]/p'
KERN_SIZE = wc -c kernel.bin | cut -d ' ' -f 1
KERN_INFO = sed "s/<KERNEL_SIZE>/$$($(KERN_SIZE))/"
KERNEL_LINK := arch/$(ARCH)/conf/kernel-link
INIT_LINK := arch/$(ARCH)/conf/init-link
KERN_FLAGS != [ $(UBSAN) ] && echo -fsanitize=undefined
INIT_FLAGS :=
KERNEL_OBJECTS != ./scripts/gen-deps --kernel --compile "$(KERNEL_SOURCES)"
INIT_OBJECTS != ./scripts/gen-deps --init --compile "$(INIT_SOURCES)"
KERNEL_LD != ./scripts/gen-deps --kernel --link "$(KERNEL_LINK).S"
INIT_LD != ./scripts/gen-deps --init --link "$(INIT_LINK).S"
include deps.mk
$(INIT_LD): kernel.bin
lint: $(INIT_OBJECTS:.o=.o.l) $(KERNEL_OBJECTS:.o=.o.l)
init.elf: $(INIT_OBJECTS) $(INIT_LD)
$(GENELF) -T $(INIT_LD) $(INIT_OBJECTS) -o $@ $(LINK_FLAGS)
kernel.elf: $(KERNEL_OBJECTS) $(KERNEL_LD)
$(GENELF) -T $(KERNEL_LD) $(KERNEL_OBJECTS) -o $@ $(LINK_FLAGS)
init.bin: init.elf
$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@
kernel.bin: kernel.elf
$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@
apos.bin: init.bin kernel.bin
cat init.bin kernel.bin > apos.bin
format:
find arch lib common include -iname '*.[ch]' \
-exec clang-format -i -style=file {} \+
clean:
$(RM) -r $(CLEANUP)
clean_run: clean
$(CLEANUP_CMD)
|
