--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/zero/vm/stack_zero.inline.hpp	Fri Apr 16 05:05:53 2010 -0700
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2010 Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// This function should match SharkStack::CreateStackOverflowCheck
+inline void ZeroStack::overflow_check(int required_words, TRAPS) {
+  JavaThread *thread = (JavaThread *) THREAD;
+
+  // Check the Zero stack
+  if (required_words > available_words()) {
+    handle_overflow(THREAD);
+    return;
+  }
+
+  // Check the ABI stack
+  address stack_top = thread->stack_base() - thread->stack_size();
+  int free_stack = ((address) &stack_top) - stack_top;
+  if (free_stack < shadow_pages_size()) {
+    handle_overflow(THREAD);
+    return;
+  }
+}