selftest mode caller

x1/selftester/Makefile

@@ -0,0 +1,33 @@
+CROSS_COMPILE := arm-linux-gnueabihf-
+AS := $(CROSS_COMPILE)as
+CC := $(CROSS_COMPILE)gcc
+LD := $(CROSS_COMPILE)ld
+OBJCOPY := $(CROSS_COMPILE)objcopy
+
+TARGET := AppMain
+OBJS := ../linkerscript/crt0.o selftester.o
+
+LIBS := ../linkerscript/libbrain/libbrain.a
+
+ASFLAGS := -W
+CFLAGS := -Wall -ffreestanding -fomit-frame-pointer -Os -I../linkerscript/libbrain
+LDFLAGS := -T ../linkerscript/x1.ld
+
+.PHONY:
+all: $(TARGET).bin
+
+.PHONY:
+clean:
+	-rm -f $(TARGET).bin $(TARGET).elf $(OBJS)
+
+%.o: %.s
+	$(AS) $(ASFLAGS) $< -o $@
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $<
+
+$(TARGET).elf: $(OBJS)
+	$(LD) $(LDFLAGS) $^ $(LIBS) -o $@
+
+$(TARGET).bin: $(TARGET).elf
+	$(OBJCOPY) -O binary $< $@

x1/selftester/selftester.c

@@ -0,0 +1,9 @@
+#include <libbrain.h>
+
+int main(void *arg)
+{
+    typedef void (*FUNC_POINTER)();
+    FUNC_POINTER func = (FUNC_POINTER)0x60198000;
+    func();
+    return 0;
+}