--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/os_cpu/windows_x86/vm/thread_windows_x86.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * 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.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_thread_windows_x86.cpp.incl"
+
+// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
+// currently interrupted by SIGPROF
+bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
+  void* ucontext, bool isInJava) {
+
+  assert(Thread::current() == this, "caller must be current thread");
+  assert(this->is_Java_thread(), "must be JavaThread");
+
+  JavaThread* jt = (JavaThread *)this;
+
+  // If we have a last_Java_frame, then we should use it even if
+  // isInJava == true.  It should be more reliable than CONTEXT info.
+  if (jt->has_last_Java_frame()) {
+    *fr_addr = jt->pd_last_frame();
+    return true;
+  }
+
+  // At this point, we don't have a last_Java_frame, so
+  // we try to glean some information out of the CONTEXT
+  // if we were running Java code when SIGPROF came in.
+  if (isInJava) {
+    CONTEXT* uc = (CONTEXT*)ucontext;
+
+#ifdef AMD64
+    intptr_t* ret_fp = (intptr_t*) uc->Rbp;
+    intptr_t* ret_sp = (intptr_t*) uc->Rsp;
+    ExtendedPC addr = ExtendedPC((address)uc->Rip);
+#else
+    intptr_t* ret_fp = (intptr_t*) uc->Ebp;
+    intptr_t* ret_sp = (intptr_t*) uc->Esp;
+    ExtendedPC addr = ExtendedPC((address)uc->Eip);
+#endif // AMD64
+    if (addr.pc() == NULL || ret_sp == NULL ) {
+      // CONTEXT wasn't useful
+      return false;
+    }
+
+    frame ret_frame(ret_sp, ret_fp, addr.pc());
+    if (!ret_frame.safe_for_sender(jt)) {
+#ifdef COMPILER2
+      // C2 uses ebp as a general register see if NULL fp helps
+      frame ret_frame2(ret_sp, NULL, addr.pc());
+      if (!ret_frame2.safe_for_sender(jt)) {
+        // nothing else to try if the frame isn't good
+        return false;
+      }
+      ret_frame = ret_frame2;
+#else
+      // nothing else to try if the frame isn't good
+      return false;
+#endif /* COMPILER2 */
+    }
+    *fr_addr = ret_frame;
+    return true;
+  }
+
+  // nothing else to try
+  return false;
+}