/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016 SAP SE. 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.

 *

 */

#ifndef OS_CPU_LINUX_S390_VM_THREAD_LINUX_S390_HPP

#define OS_CPU_LINUX_S390_VM_THREAD_LINUX_S390_HPP

 private:

  void pd_initialize() {

    _anchor.clear();

    _last_interpreter_fp = NULL;

  }

  // The `last' frame is the youngest Java frame on the thread's stack.

  frame pd_last_frame() {

    assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");

    intptr_t* sp = last_Java_sp();

    address pc = _anchor.last_Java_pc();

    // Last_Java_pc ist not set if we come here from compiled code.

    if (pc == NULL) {

      pc = (address) *(sp + 14);

    }

    return frame(sp, pc);

  }

 public:

  void set_base_of_stack_pointer(intptr_t* base_sp) {}

  intptr_t* base_of_stack_pointer() { return NULL; }

  void record_base_of_stack_pointer() {}

  // These routines are only used on cpu architectures that

  // have separate register stacks (Itanium).

  static bool register_stack_overflow() { return false; }

  static void enable_register_stack_guard() {}

  static void disable_register_stack_guard() {}

  bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava);

 protected:

  // -Xprof support

  //

  // In order to find the last Java fp from an async profile

  // tick, we store the current interpreter fp in the thread.

  // This value is only valid while we are in the C++ interpreter

  // and profiling.

  intptr_t *_last_interpreter_fp;

 public:

  static ByteSize last_interpreter_fp_offset() {

    return byte_offset_of(JavaThread, _last_interpreter_fp);

  }

  intptr_t* last_interpreter_fp() { return _last_interpreter_fp; }

#endif // OS_CPU_LINUX_S390_VM_THREAD_LINUX_S390_HPP