Implement elfloader/module support

Makefile

@@ -6,7 +6,9 @@ include $(DEVKITARM)/base_rules
 
 TARGET := ipl
 BUILD := build_ipl
+OUTPUT := output
 SOURCEDIR := ipl
+
 OBJS = $(addprefix $(BUILD)/, \
 	start.o \
 	main.o \
@@ -43,27 +45,34 @@ OBJS = $(addprefix $(BUILD)/, \
 	uart.o \
 	ini.o \
 )
+
 OBJS += $(addprefix $(BUILD)/, diskio.o ff.o ffunicode.o ffsystem.o)
+OBJS += $(addprefix $(BUILD)/elfloader/, elfload.o elfreloc_arm.o)
 
 ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
-CUSTOMDEFINES := -DMENU_LOGO_ENABLE
+CUSTOMDEFINES := -DMENU_LOGO_ENABLE #-DDEBUG
 CFLAGS = $(ARCH) -O2 -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-inline -std=gnu11 -Wall $(CUSTOMDEFINES)
 LDFLAGS = $(ARCH) -nostartfiles -lgcc -Wl,--nmagic,--gc-sections
 
-.PHONY: all clean
+MODULEDIRS := $(wildcard modules/*)
+
+.PHONY: all clean $(MODULEDIRS)
 
 all: $(TARGET).bin
 	@echo -n "Payload size is "
-	@wc -c < $(TARGET).bin
+	@wc -c < $(OUTPUT)/$(TARGET).bin
 	@echo "Max size is 126296 Bytes."
 
 clean:
 	@rm -rf $(OBJS)
 	@rm -rf $(BUILD)
-	@rm -rf $(TARGET).bin
+	@rm -rf $(OUTPUT)
 
-$(TARGET).bin: $(BUILD)/$(TARGET).elf
-	$(OBJCOPY) -S -O binary $< $@
+$(MODULEDIRS):
+	$(MAKE) -C $@ $(MAKECMDGOALS)
+
+$(TARGET).bin: $(BUILD)/$(TARGET).elf $(MODULEDIRS)
+	$(OBJCOPY) -S -O binary $< $(OUTPUT)/$@
 
 $(BUILD)/$(TARGET).elf: $(OBJS)
 	$(CC) $(LDFLAGS) -T ipl/link.ld $^ -o $@
@@ -73,4 +82,6 @@ $(BUILD)/%.o: $(SOURCEDIR)/%.c
 
 $(BUILD)/%.o: $(SOURCEDIR)/%.S
 	@mkdir -p "$(BUILD)"
+	@mkdir -p "$(BUILD)/elfloader"
+	@mkdir -p "$(OUTPUT)"
 	$(CC) $(CFLAGS) -c $< -o $@