1 files changed, 126 insertions, 0 deletions
diff --git a/scripts/makefile b/scripts/makefile
new file mode 100644
index 0000000..762c5c9
--- /dev/null
+++ b/scripts/makefile
@@ -0,0 +1,126 @@
+# this could be done better
+RELEASE		?= 0
+OPTFLAGS	!= [ "$(RELEASE)" != "0" ] \
+			&& echo "-O3 -flto" \
+			|| echo "-O0"
+
+DEBUG		?= 1
+DEBUGFLAGS	!= [ "$(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_INIT_BUILD = $(BUILD)/init/arch/$(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
+INIT_LINK	= arch/$(ARCH)/conf/init-link.S
+
+KERNEL_LD	= build/kernel-link.ld
+INIT_LD		= build/init-link.ld
+
+UBSAN		?= 0
+KERN_FLAGS	!= [ "$(UBSAN)" != "0" ] \
+			&& echo -fsanitize=undefined \
+			|| echo
+
+INIT_FLAGS	:= -fpic
+
+COMPILE_KERNEL	= $(COMPILE) $(KERN_FLAGS)
+COMPILE_INIT	= $(COMPILE) $(INIT_FLAGS)
+
+-include deps.mk
+
+-include $(KERNEL_LD).d
+$(INIT_LD): kernel.bin
+$(INIT_LD): $(INIT_LINK)
+	$(GENLINK) $(INIT_LINK) | $(STRIPLINK) | $(KERN_INFO) > $(INIT_LD)
+
+-include $(KERNEL_LD).d
+$(KERNEL_LD): $(KERNEL_LINK)
+	$(GENLINK) $(KERNEL_LINK) | $(STRIPLINK) > $(KERNEL_LD)
+
+init.elf: $(INIT_OBJS) $(INIT_LD)
+	$(GENELF) $(INIT_FLAGS) -T $(INIT_LD) $(INIT_OBJS) -o init.elf $(LINK_FLAGS)
+
+kernel.elf: $(KERNEL_OBJS) $(KERNEL_LD)
+	$(GENELF) $(KERNEL_FLAGS) -T $(KERNEL_LD) $(KERNEL_OBJS) -o kernel.elf $(LINK_FLAGS)
+
+init.bin: init.elf
+	$(OBJCOPY) $(OBJCOPY_FLAGS) init.elf init.bin
+
+kernel.bin: kernel.elf
+	$(OBJCOPY) $(OBJCOPY_FLAGS) kernel.elf kernel.bin
+
+kmi.bin: init.bin kernel.bin
+	cat init.bin kernel.bin > kmi.bin
+
+# might lint some common things twice
+.PHONY:
+lint: $(INIT_LINTS) $(KERNEL_LINTS)