1 /*
   2  * Copyright (c) 2008, 2016, Oracle and/or its affiliates. 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_LINUX_ARM_VM_THREAD_LINUX_ARM_HPP
  26 #define OS_CPU_LINUX_ARM_VM_THREAD_LINUX_ARM_HPP
  27 
  28  private:
  29   // The following thread-local variables replicate corresponding global variables.
  30   // They are used for a quick access from compiled code via Rthread register.
  31   address _heap_top_addr;
  32   address _heap_lock_addr;
  33   address _card_table_base;
  34 
  35   void pd_initialize() {
  36     _anchor.clear();
  37   }
  38 
  39   frame pd_last_frame() {
  40     assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
  41 #ifdef AARCH64
  42     assert (_anchor.last_Java_pc() != NULL, "pc should be stored");
  43     return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
  44 #else
  45     if (_anchor.last_Java_pc() != NULL) {
  46       return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
  47     } else {
  48       // This will pick up pc from sp
  49       return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp());
  50     }
  51 #endif // AARCH64
  52   }
  53 
  54  public:
  55   intptr_t* last_Java_fp()                       { return _anchor.last_Java_fp(); }
  56   void  set_last_Java_fp(intptr_t* fp)           { _anchor.set_last_Java_fp(fp);  }
  57   void  set_last_Java_pc(address pc)             { _anchor.set_last_Java_pc(pc);  }
  58 
  59   static ByteSize last_Java_fp_offset()          {
  60     return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_fp_offset();
  61   }
  62 
  63   void set_base_of_stack_pointer(intptr_t* base_sp) {
  64     // Nothing to do
  65   }
  66 
  67   intptr_t* base_of_stack_pointer() {
  68     return NULL;
  69   }
  70 
  71   void record_base_of_stack_pointer() {
  72     // Nothing to do
  73   }
  74 
  75   static ByteSize heap_top_addr_offset()         { return byte_offset_of(JavaThread, _heap_top_addr); }
  76   static ByteSize card_table_base_offset()       { return byte_offset_of(JavaThread, _card_table_base); }
  77 
  78   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava);
  79 
  80   bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);
  81 private:
  82   bool pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava);
  83 public:
  84 
  85   // These routines are only used on cpu architectures that
  86   // have separate register stacks (Itanium).
  87   static bool register_stack_overflow() { return false; }
  88   static void enable_register_stack_guard() {}
  89   static void disable_register_stack_guard() {}
  90 
  91 #endif // OS_CPU_LINUX_ARM_VM_THREAD_LINUX_ARM_HPP