tasking: add simple base for running things in ring 3

Makefile

@@ -2,7 +2,7 @@
 OBJS = bin/boot.o bin/kernel.o bin/idt.o bin/isr.o bin/screen.o \
 	bin/utils.o bin/string.o bin/stdio.o bin/disk.o bin/pic.o bin/pit.o \
 	bin/keyboard.o bin/paging.o bin/heap.o bin/page_alloc.o bin/page_tables.o \
-	bin/fat.o bin/task.o bin/switch.o
+	bin/fat.o bin/task.o bin/switch.o bin/sys_exit.o
 
 # Define the compiler and assembler
 CC = gcc -D__is_katauos
@@ -114,6 +114,9 @@ bin/switch.o: src/tasking/switch.asm
 bin/task.o: src/tasking/task.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
+bin/sys_exit.o: src/tasking/sys_exit.asm
+	$(AS) $(ASFLAGS) $< -o $@
+
 clean:
 	rm -rf bin/
 	rm -f $(OUTPUT)