Changeset 14863

Timestamp:

Jul 5, 2011, 9:59:04 AM (13 years ago)

Author:

Gary Byers

Message:

In handle_fault: some OSes (you know who) don't bother to set
information about the fault address on certain kinds of memory
faults, so we can't compare it to tcr.safe_ref_address. If
tcr.save_ref_address is non-zero when we get a fault, behave
as if we'd accessed that address (how would we know what address
was accessed ?) and return a null pointer to %SAFE-GET-PTR.

File:

• trunk/source/lisp-kernel/x86-exceptions.c (modified) (1 diff)

trunk/source/lisp-kernel/x86-exceptions.c

@@ -866 +866 @@
   Boolean valid = IS_PAGE_FAULT(info,xp);
 
+  if (tcr->safe_ref_address != NULL) {
+    xpGPR(xp,Iimm0) = 0;
+    xpPC(xp) = xpGPR(xp,Ira0);
+    tcr->safe_ref_address = NULL;
+    return true;
+  }
+
   if (valid) {
-    if (addr && (addr == tcr->safe_ref_address)) {
-      xpGPR(xp,Iimm0) = 0;
-      xpPC(xp) = xpGPR(xp,Ira0);
-      return true;
-    }
-    
     {
       protected_area *a = find_protected_area(addr);