1 /*
   2  * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
   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_LINUX_AARCH64_VM_THREAD_LINUX_AARCH64_HPP
  27 #define OS_CPU_LINUX_AARCH64_VM_THREAD_LINUX_AARCH64_HPP
  28 
  29  private:
  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     assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
  46     if (_anchor.last_Java_pc() != NULL) {
  47       return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
  48     } else {
  49       // This will pick up pc from sp
  50       return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp());
  51     }
  52   }
  53 
  54  public:
  55   // Mutators are highly dangerous....
  56   intptr_t* last_Java_fp()                       { return _anchor.last_Java_fp(); }
  57   void  set_last_Java_fp(intptr_t* fp)           { _anchor.set_last_Java_fp(fp);   }
  58 
  59   void set_base_of_stack_pointer(intptr_t* base_sp) {
  60   }
  61 
  62   static ByteSize last_Java_fp_offset()          {
  63     return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_fp_offset();
  64   }
  65 
  66   intptr_t* base_of_stack_pointer() {
  67     return NULL;
  68   }
  69   void record_base_of_stack_pointer() {
  70   }
  71 
  72   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
  73     bool isInJava);
  74 
  75   bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);
  76 private:
  77   bool pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava);
  78 public:
  79 
  80   // These routines are only used on cpu architectures that
  81   // have separate register stacks (Itanium).
  82   static bool register_stack_overflow() { return false; }
  83   static void enable_register_stack_guard() {}
  84   static void disable_register_stack_guard() {}
  85 
  86 #endif // OS_CPU_LINUX_AARCH64_VM_THREAD_LINUX_AARCH64_HPP