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# this could be done better
RELEASE ?= 0
OPTFLAGS != [ "$(RELEASE)" != "0" ] \
&& echo "-O2 -flto=auto" \
|| echo "-O0"
DEBUG ?= 1
DEBUGFLAGS != [ "$(DEBUG)" != "0" ] \
&& echo "-DDEBUG=1" \
|| echo "-DNDEBUG=1"
GENERIC_UBOOT ?= 0
UBOOTFLAGS != [ "$(GENERIC_UBOOT)" != "0" ] \
&& echo "-DGENERIC_UBOOT=1" \
|| echo
ASSERT ?= 1
ASSERTFLAGS != [ "$(ASSERT)" != "0" ] \
&& echo "-DASSERT=1" \
|| echo
DEPFLAGS = -MT $@ -MMD -MP -MF $@.d
LINTFLAGS = -fsyntax-only
PREPROCESS = -E
LLVM ?= 0
LDFLAGS != [ "$(LLVM)" = "0" ] \
&& echo -static-libgcc -lgcc \
|| echo
BUILD = build
ARCH_KERN_BUILD = $(BUILD)/kernel/arch/$(ARCH)
ARCH_SOURCE = arch/$(ARCH)
all: kmi.bin
# default values, overwrite if/when needed
ARCH ?= riscv64
CROSS_COMPILE ?= $(ARCH)-unknown-elf-
OBJCOPY != [ "$(LLVM)" != "0" ] \
&& echo llvm-objcopy \
|| echo $(CROSS_COMPILE)objcopy
COMPILER != [ "$(LLVM)" != "0" ] \
&& echo clang --target="$(CROSS_COMPILE)" \
|| echo $(CROSS_COMPILE)gcc
OBFLAGS = -ffreestanding -nostdlib -static -fno-pie -std=c17 -g
WARNFLAGS = -Wall -Wextra -Wvla
ARCH_CFLAGS = -D$(ARCH)
include arch/$(ARCH)/source.mk
COMPILE_FLAGS = $(CFLAGS) $(WARNFLAGS) $(OPTFLAGS) $(OBFLAGS) $(ASSERTFLAGS) \
$(DEBUGFLAGS) $(UBOOTFLAGS) $(ARCH_CFLAGS)
LINK_FLAGS = $(LDFLAGS) $(ARCH_LDFLAGS)
INCLUDE_FLAGS = -I include -include config.h -include arch/$(ARCH)/config.h
# This makes sure .bss is loaded into the binary
OBJCOPY_FLAGS ?= -Obinary -R .garbage \
--set-section-flags .bss=alloc,load,contents
COMPILE = $(COMPILER) \
$(COMPILE_FLAGS) $(DEPFLAGS) $(INCLUDE_FLAGS)
LINT = $(COMPILER) \
$(COMPILE_FLAGS) $(LINTFLAGS) $(INCLUDE_FLAGS)
GENELF = $(COMPILER) \
$(COMPILE_FLAGS) $(INCLUDE_FLAGS)
GENLINK = $(COMPILER) $(COMPILE_FLAGS) $(PREPROCESS) $(DEPFLAGS) $(INCLUDE_FLAGS)
STRIPLINK = sed -n '/^[^\#]/p'
KERN_SIZE = wc -c kernel.bin | awk '{print $$1}'
KERN_INFO = sed "s/<KERNEL_SIZE>/$$($(KERN_SIZE))/"
KERNEL_LINK = arch/$(ARCH)/conf/kernel-link.S
KERNEL_LD = build/kernel-link.ld
UBSAN ?= 0
KERN_FLAGS != [ "$(UBSAN)" != "0" ] \
&& echo -fsanitize=undefined \
|| echo
COMPILE_KERNEL = $(COMPILE) $(KERN_FLAGS)
COMPILE_INIT = $(COMPILE) $(INIT_FLAGS)
-include deps.mk
-include $(KERNEL_LD).d
$(KERNEL_LD): $(KERNEL_LINK)
$(GENLINK) $(KERNEL_LINK) | $(STRIPLINK) > $(KERNEL_LD)
kmi.elf: $(KERNEL_OBJS) $(KERNEL_LD)
$(GENELF) $(KERNEL_FLAGS) -T $(KERNEL_LD) $(KERNEL_OBJS) -o kmi.elf $(LINK_FLAGS)
kmi.bin: kmi.elf
$(OBJCOPY) $(OBJCOPY_FLAGS) kmi.elf kmi.bin
# might lint some common things twice
.PHONY:
lint: $(KERNEL_LINTS)
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