text: /*
   * Copyright (c) 1998, 2018, 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.
   *
   */
  
  #ifndef OS_CPU_SOLARIS_SPARC_VM_THREAD_SOLARIS_SPARC_HPP
  #define OS_CPU_SOLARIS_SPARC_VM_THREAD_SOLARIS_SPARC_HPP
  private:
  
    void pd_initialize() {
      _anchor.clear();
      _base_of_stack_pointer        = NULL;
    }
  
    frame pd_last_frame();
  
    // 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); }
  
    static ByteSize saved_exception_npc_offset() { return byte_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);
  
    bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);
  private:
    bool pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava, bool makeWalkable);
  public:
  
    // 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() {}
  
  #endif // OS_CPU_SOLARIS_SPARC_VM_THREAD_SOLARIS_SPARC_HPP
  