Experimental implementation of map & write.

Data is still dummy.
Not even compiled.
	modified:   executer/kernel/mcctrl.h
	modified:   executer/kernel/syscall.c
	modified:   kernel/include/syscall.h
	modified:   kernel/mem.c

kernel/include/syscall.h

@@ -224,4 +224,9 @@ enum {
 #undef	SYSCALL_DELEGATED
 
 #define	__NR_coredump 999	/* pseudo syscall for coredump */
+struct coretable {
+	int len;
+	void *addr;
+}
+
 #endif