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DO != echo > deps.mk
# this could be done better
DEBUGFLAGS != [ $(DEBUG) ] && echo "-O0 -ggdb3 -DDEBUG" || echo "-flto -O2"
CFLAGS = -fno-pie -ffreestanding -nostdlib -std=c17 -Wall -Wextra
DEPFLAGS = -MT $@ -MMD -MP -MF $@.d
all: apos.bin
ARCH ?= riscv
CROSS_COMPILE ?= riscv64-unknown-elf-
# Common programs
CC := gcc
AR := ar
CPP := cpp
OBJCOPY ?= objcopy
# This makes sure .bss is loaded into the binary
OBJCOPY_FLAGS ?= -Obinary --set-section-flags .bss=alloc,load,contents
COMMON_SOURCES != echo common/*.c
KERNEL_SOURCES != echo kernel/*.c $(COMMON_SOURCES)
INIT_SOURCES := $(COMMON_SOURCES)
CLEANUP := build deps.mk kernel.* init.* apos.bin
CLEANUP_CMD :=
include arch/$(ARCH)/source.mk
INCLUDE_FLAGS := -I include -I arch/$(ARCH)/include\
-include config.h -include arch/$(ARCH)/config.h
COMPILE = $(CROSS_COMPILE)$(CC) $(DEBUGFLAGS)\
$(CFLAGS) $(ARCH_FLAGS) $(DEPFLAGS) $(INCLUDE_FLAGS)
GENELF = $(CROSS_COMPILE)$(CC) $(DEBUGFLAGS)\
$(CFLAGS) $(ARCH_FLAGS) $(INCLUDE_FLAGS)
GENLINK = $(CROSS_COMPILE)$(CPP) $(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/$(ARCH)/conf/init-link
KERNEL_OBJECTS != ./scripts/gen-deps --kern "$(KERNEL_SOURCES)"
INIT_OBJECTS != ./scripts/gen-deps --init "$(INIT_SOURCES)"
KERNEL_LD != ./scripts/gen-deps --kern-link "$(KERNEL_LINK).S"
INIT_LD != ./scripts/gen-deps --init-link "$(INIT_LINK).S"
include deps.mk
apos.bin: kernel.bin init.bin
cat init.bin kernel.bin > $@
kernel.elf: $(KERNEL_OBJECTS) $(KERNEL_LD)
$(GENELF) -T $(KERNEL_LD) $(KERNEL_OBJECTS) -o $@
$(INIT_LD): kernel.bin
init.elf: $(INIT_OBJECTS) $(INIT_LD)
$(GENELF) -T $(INIT_LD) $(INIT_OBJECTS) -o $@
kernel.bin: kernel.elf
$(CROSS_COMPILE)$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@
init.bin: init.elf
$(CROSS_COMPILE)$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@
clean:
$(RM) -r $(CLEANUP)
clean_run: clean
$(CLEANUP_CMD)
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