SRCS=main.c leds.c

CC=mipsel-elf-gcc
LD=mipsel-elf-ld
OBJCOPY=mipsel-elf-objcopy
CFLAGS=-Wall -Wextra -mips1 -mno-abicalls
LFLAGS=-mips1

BASES=$(patsubst %.c,%,$(SRCS))
DEPS=$(addsuffix .d,$(BASES))
OBJS=$(addsuffix .o,$(BASES))

.PHONY: all clean

all: rom.vhd

ifneq ($(MAKECMDGOALS),clean)
  include deps
endif

deps: $(DEPS)
	cat /dev/null $^ >$@

%.d: %.c Makefile
	$(CC) $(CFLAGS) -M -o $@ $<

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

%.o: %.s Makefile
	$(CC) $(CFLAGS) -c -o $@ $<

fw.o: $(OBJS)
	$(LD) $(LFLAGS) -r -o $@ $^

fw: lnk.cmd boot.o fw.o
	$(LD) $(LFLAGS) -T lnk.cmd -o $@ boot.o fw.o

fw.bin: fw
	$(OBJCOPY) -j .text -O binary $< $@

rom.vhd: rom.head.vhd rom.tail.vhd fw.bin
	cat rom.head.vhd >$@
	hexdump -e '1/4 "%08X\n"' -v fw.bin | \
	  sed 's/^/=> X"/;s/$$/",/' | \
	  nl -p -v 0 | \
	  sed 's/^/        /' >>$@
	cat rom.tail.vhd >>$@

clean:
	rm -f $(OBJS) boot.o fw.o fw fw.bin rom.vhd