--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os_cpu/linux_arm/thread_linux_arm.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2008, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/shared/barrierSet.inline.hpp"
+#include "gc/shared/cardTableModRefBS.inline.hpp"
+#include "gc/shared/collectedHeap.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "runtime/frame.inline.hpp"
+
+void JavaThread::cache_global_variables() {
+  BarrierSet* bs = Universe::heap()->barrier_set();
+
+  const bool allow_shared_alloc =
+    Universe::heap()->supports_inline_contig_alloc();
+
+  if (allow_shared_alloc) {
+    _heap_top_addr = (address) Universe::heap()->top_addr();
+  } else {
+    _heap_top_addr = NULL;
+  }
+
+  if (bs->is_a(BarrierSet::CardTableModRef)) {
+    _card_table_base = (address) (barrier_set_cast<CardTableModRefBS>(bs)->byte_map_base);
+  } else {
+    _card_table_base = NULL;
+  }
+
+}
+
+// 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");
+  return pd_get_top_frame(fr_addr, ucontext, isInJava);
+}
+
+bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
+  return pd_get_top_frame(fr_addr, ucontext, isInJava);
+}
+
+bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
+  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 ucontext info.
+  if (jt->has_last_Java_frame() AARCH64_ONLY(&& jt->last_Java_pc() != NULL)) {
+    *fr_addr = jt->pd_last_frame();
+    return true;
+  }
+
+  // Could be in a code section that plays with the stack, like
+  // MacroAssembler::verify_heapbase()
+  if (jt->in_top_frame_unsafe_section()) {
+    return false;
+  }
+
+  // At this point, we don't have a last_Java_frame, so
+  // we try to glean some information out of the ucontext
+  // if we were running Java code when SIGPROF came in.
+  if (isInJava) {
+    ucontext_t* uc = (ucontext_t*) ucontext;
+
+    intptr_t* ret_fp;
+    intptr_t* ret_sp;
+    ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc,
+      &ret_sp, &ret_fp);
+    if (addr.pc() == NULL || ret_sp == NULL ) {
+      // ucontext wasn't useful
+      return false;
+    }
+
+    if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
+      // In the middle of a trampoline call. Bail out for safety.
+      // This happens rarely so shouldn't affect profiling.
+      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;
+}