/*

 * Copyright 1998-2007 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.

 *

 */

private:

  void pd_initialize() {

    _anchor.clear();

    _base_of_stack_pointer        = NULL;

  }

  frame pd_last_frame() {

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

    assert(_anchor.walkable(), "thread has not dumped its register windows yet");

    assert(_anchor.last_Java_pc() != NULL, "Ack no pc!");

    return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc());

  }

  // Sometimes the trap handler needs to record both PC and NPC.

  // This is a SPARC-specific companion to Thread::set_saved_exception_pc.

  address _saved_exception_npc;

  // In polling_page_safepoint_handler_blob(s) we have to tail call other

  // blobs without blowing any registers.  A tail call requires some

  // register to jump with and we can't blow any registers, so it must

  // be restored in the delay slot.  'restore' cannot be used as it

  // will chop the heads off of 64-bit %o registers in the 32-bit

  // build.  Instead we reload the registers using G2_thread and this

  // location.  Must be 64bits in the 32-bit LION build.

  jdouble _o_reg_temps[6];

  // a stack pointer older than any java frame stack pointer.  It is

  // used to validate stack pointers in frame::next_younger_sp (it

  // provides the upper bound in the range check).  This is necessary

  // on Solaris/SPARC since the ucontext passed to a signal handler is

  // sometimes corrupt and we need a way to check the extracted sp.

  intptr_t* _base_of_stack_pointer;

public:

  static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); }

#ifndef _LP64

  address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; }

#endif

  static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); }

  address  saved_exception_npc()             { return _saved_exception_npc; }

  void set_saved_exception_npc(address a)    { _saved_exception_npc = a; }

public:

  intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; }

  void set_base_of_stack_pointer(intptr_t* base_sp) {

    _base_of_stack_pointer = base_sp;

  }

  void record_base_of_stack_pointer() {

    intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()()));

    intptr_t *ysp;

    while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) {

      sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS);

    }

    _base_of_stack_pointer = sp;

  }

  bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,

    bool isInJava);

  // 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() {}