1 /*
   2  * Copyright (c) 2020, Microsoft Corporation. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef OS_CPU_WINDOWS_AARCH64_THREAD_WINDOWS_AARCH64_HPP
  26 #define OS_CPU_WINDOWS_AARCH64_THREAD_WINDOWS_AARCH64_HPP
  27 
  28  private:
  29 
  30 #ifdef ASSERT
  31   // spill stack holds N callee-save registers at each Java call and
  32   // grows downwards towards limit
  33   // we need limit to check we have space for a spill and base so we
  34   // can identify all live spill frames at GC (eventually)
  35   address          _spill_stack;
  36   address          _spill_stack_base;
  37   address          _spill_stack_limit;
  38 #endif // ASSERT
  39 
  40   void pd_initialize() {
  41     _anchor.clear();
  42   }
  43 
  44   frame pd_last_frame();
  45 
  46  public:
  47   // Mutators are highly dangerous....
  48   intptr_t* last_Java_fp()                       { return _anchor.last_Java_fp(); }
  49   void  set_last_Java_fp(intptr_t* fp)           { _anchor.set_last_Java_fp(fp);   }
  50 
  51   void set_base_of_stack_pointer(intptr_t* base_sp) {
  52   }
  53 
  54   static ByteSize last_Java_fp_offset()          {
  55     return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_fp_offset();
  56   }
  57 
  58   intptr_t* base_of_stack_pointer() {
  59     return NULL;
  60   }
  61   void record_base_of_stack_pointer() {
  62   }
  63 
  64   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
  65     bool isInJava);
  66 
  67   bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);
  68 private:
  69   bool pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava);
  70 public:
  71 
  72   static Thread *aarch64_get_thread_helper() {
  73      return Thread::current();
  74   }
  75 
  76   // These routines are only used on cpu architectures that
  77   // have separate register stacks (Itanium).
  78   static bool register_stack_overflow() { return false; }
  79   static void enable_register_stack_guard() {}
  80   static void disable_register_stack_guard() {}
  81 
  82 #endif // OS_CPU_WINDOWS_AARCH64_THREAD_WINDOWS_AARCH64_HPP