1 /*
   2  * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef OS_CPU_BSD_ZERO_VM_THREAD_BSD_ZERO_HPP
  27 #define OS_CPU_BSD_ZERO_VM_THREAD_BSD_ZERO_HPP
  28 
  29  private:
  30   ZeroStack  _zero_stack;
  31   ZeroFrame* _top_zero_frame;
  32 
  33   void pd_initialize() {
  34     _top_zero_frame = NULL;
  35   }
  36 
  37  public:
  38   ZeroStack *zero_stack() {
  39     return &_zero_stack;
  40   }
  41 
  42  public:
  43   ZeroFrame *top_zero_frame() {
  44     return _top_zero_frame;
  45   }
  46   void push_zero_frame(ZeroFrame *frame) {
  47     *(ZeroFrame **) frame = _top_zero_frame;
  48     _top_zero_frame = frame;
  49   }
  50   void pop_zero_frame() {
  51     zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1);
  52     _top_zero_frame = *(ZeroFrame **) _top_zero_frame;
  53   }
  54 
  55  public:
  56   static ByteSize zero_stack_offset() {
  57     return byte_offset_of(JavaThread, _zero_stack);
  58   }
  59   static ByteSize top_zero_frame_offset() {
  60     return byte_offset_of(JavaThread, _top_zero_frame);
  61   }
  62 
  63  public:
  64   void record_base_of_stack_pointer() {
  65     assert(top_zero_frame() == NULL, "junk on stack prior to Java call");
  66   }
  67   void set_base_of_stack_pointer(intptr_t* base_sp) {
  68     assert(base_sp == NULL, "should be");
  69     assert(top_zero_frame() == NULL, "junk on stack after Java call");
  70   }
  71 
  72  public:
  73   void set_last_Java_frame() {
  74     set_last_Java_frame(top_zero_frame(), zero_stack()->sp());
  75   }
  76   void reset_last_Java_frame() {
  77     frame_anchor()->zap();
  78   }
  79   void set_last_Java_frame(ZeroFrame* fp, intptr_t* sp) {
  80     frame_anchor()->set(sp, NULL, fp);
  81   }
  82 
  83  public:
  84   ZeroFrame* last_Java_fp() {
  85     return frame_anchor()->last_Java_fp();
  86   }
  87 
  88  private:
  89   frame pd_last_frame();
  90 
  91  public:
  92   static ByteSize last_Java_fp_offset() {
  93     return byte_offset_of(JavaThread, _anchor) +
  94       JavaFrameAnchor::last_Java_fp_offset();
  95   }
  96 
  97  public:
  98   // Check for pending suspend requests and pending asynchronous
  99   // exceptions.  There are separate accessors for these, but
 100   // _suspend_flags is volatile so using them would be unsafe.
 101   bool has_special_condition_for_native_trans() {
 102     return _suspend_flags != 0;
 103   }
 104 
 105  public:
 106   bool pd_get_top_frame_for_signal_handler(frame* fr_addr,
 107                                            void* ucontext,
 108                                            bool isInJava) {
 109     ShouldNotCallThis();
 110     return false;
 111   }
 112 
 113   // These routines are only used on cpu architectures that
 114   // have separate register stacks (Itanium).
 115   static bool register_stack_overflow() { return false; }
 116   static void enable_register_stack_guard() {}
 117   static void disable_register_stack_guard() {}
 118 
 119 #endif // OS_CPU_BSD_ZERO_VM_THREAD_BSD_ZERO_HPP