1 /*
   2  * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2012, 2013 SAP AG. 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_PPC_VM_THREAD_LINUX_PPC_HPP
  27 #define OS_CPU_LINUX_PPC_VM_THREAD_LINUX_PPC_HPP
  28 
  29  private:
  30 
  31   void pd_initialize() {
  32     _anchor.clear();
  33     _last_interpreter_fp = NULL;
  34   }
  35 
  36   // The `last' frame is the youngest Java frame on the thread's stack.
  37   frame pd_last_frame() {
  38     assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
  39 
  40     intptr_t* sp = last_Java_sp();
  41     address pc = _anchor.last_Java_pc();
  42 
  43     // Last_Java_pc ist not set, if we come here from compiled code.
  44     if (pc == NULL) {
  45       pc = (address) *(sp + 2);
  46     }
  47 
  48     return frame(sp, pc);
  49   }
  50 
  51  public:
  52 
  53   void set_base_of_stack_pointer(intptr_t* base_sp) {}
  54   intptr_t* base_of_stack_pointer() { return NULL; }
  55   void record_base_of_stack_pointer() {}
  56 
  57   // These routines are only used on cpu architectures that
  58   // have separate register stacks (Itanium).
  59   static bool register_stack_overflow() { return false; }
  60   static void enable_register_stack_guard() {}
  61   static void disable_register_stack_guard() {}
  62 
  63   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava);
  64 
  65   bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);
  66 
  67  protected:
  68 
  69   // -Xprof support
  70   //
  71   // In order to find the last Java fp from an async profile
  72   // tick, we store the current interpreter fp in the thread.
  73   // This value is only valid while we are in the C++ interpreter
  74   // and profiling.
  75   intptr_t *_last_interpreter_fp;
  76 
  77  public:
  78 
  79   static ByteSize last_interpreter_fp_offset() {
  80     return byte_offset_of(JavaThread, _last_interpreter_fp);
  81   }
  82 
  83   intptr_t* last_interpreter_fp() { return _last_interpreter_fp; }
  84 
  85 #endif // OS_CPU_LINUX_PPC_VM_THREAD_LINUX_PPC_HPP