fault_address isn't always aligned properly for reading of pointer
(i.e. OOP, which is struct OOP *) - so read only one byte.
--- smalltalk-2.1.8/libgst/oop.c.orig	2004-01-09 13:05:15.000000000 +0100
+++ smalltalk-2.1.8/libgst/oop.c	2004-07-15 16:58:13.000000000 +0200
@@ -856,7 +856,7 @@
     }
 
   /* Try accessing the page */
-  (void) *(volatile OOP *) fault_address;
+  (void) *(volatile char *) fault_address;
   reentering = 0;
 
 #if defined (MMAN_DEBUGGING)