CROSS_COMPILE ?= mipsel-linux-gnu-
CC             = ${CROSS_COMPILE}gcc
LD             = ${CROSS_COMPILE}ld
OBJCOPY        = ${CROSS_COMPILE}objcopy
OBJDUMP        = ${CROSS_COMPILE}objdump
AR             = ${CROSS_COMPILE}ar

CFLAGS = -O3 -fno-pic -mno-branch-likely -mno-abicalls -msoft-float -fno-builtin -mno-shared -mips1 -EL -nostdinc -nostdlib

OBJ_DIR = obj

USER_DIR      = src
USER_OBJ_DIR  = obj/user
USER_SRC      = $(wildcard $(USER_DIR)/*.S) $(wildcard $(USER_DIR)/*.c)
USER_OBJ     := $(patsubst $(USER_DIR)/%.S, $(USER_OBJ_DIR)/%.o, $(USER_SRC))
USER_OBJ     := $(patsubst $(USER_DIR)/%.c, $(USER_OBJ_DIR)/%.o, $(USER_OBJ))

TINY_C_DIR      = lib
TINY_C_OBJ_DIR  = obj/tinyc
TINY_C_SRC      = $(wildcard $(TINY_C_DIR)/*.S) $(wildcard $(TINY_C_DIR)/*.c)
TINY_C_OBJ     := $(patsubst $(TINY_C_DIR)/%.S, $(TINY_C_OBJ_DIR)/%.o, $(TINY_C_SRC))
TINY_C_OBJ     := $(patsubst $(TINY_C_DIR)/%.c, $(TINY_C_OBJ_DIR)/%.o, $(TINY_C_OBJ))
TINY_C_TARGET   = $(TINY_C_OBJ_DIR)/libtinyc.a

default: all

%.o : %.S
	$(CC) -c -I include $(CFLAGS) -o $@ $<

%.o : %.c
	$(CC) -c -I include $(CFLAGS) -o $@ $<

$(TINY_C_TARGET): $(TINY_C_OBJ)
	$(AR) -cr $@ $^

bin.lds: bin.lds.S
	$(CC) -EL -E -P -o $@ $<

main.elf: start.o bin.lds $(TINY_C_TARGET) $(USER_OBJ)
	$(LD) -g -EL -T bin.lds start.o $(USER_OBJ) $(TINY_C_TARGET) -o $(OBJ_DIR)/$@
	$(OBJDUMP) -alD $(OBJ_DIR)/$@ > $(OBJ_DIR)/test.s

axi_ram.bin: main.elf
	$(OBJCOPY) -O binary -j .text -j .data  $(OBJ_DIR)/$< $(OBJ_DIR)/$@

all: env convert axi_ram.bin
	./convert axi_ram.bin $(OBJ_DIR)/

convert: convert.c
	clang -o convert convert.c

env:
	mkdir -p $(USER_OBJ_DIR)
	mkdir -p $(TINY_C_OBJ_DIR)

clean:
	rm -f *.o *.bin *.elf *.a testbin *.s *.vlog *.coe *.data *.mif
	rm -f bin.lds convert
	rm -rf obj

help:
	@echo "####################################################################"
	@echo "### help for compiling our awesome project                       ###"
	@echo "####################################################################"
	@echo "### options:                                                     ###"
	@echo "###     make      : get compiled result, which is saved in ./obj ###"
	@echo "###     make clean: remove *.o, *.a, and ./obj                   ###"
	@echo "###     make help : show help information                        ###"
	@echo "####################################################################"