1 /*
   2  * Copyright (c) 1998, 2008, 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 private:
  26 
  27   void pd_initialize() {
  28     _anchor.clear();
  29     _base_of_stack_pointer        = NULL;
  30   }
  31 
  32   frame pd_last_frame() {
  33     assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
  34     assert(_anchor.walkable(), "thread has not dumped its register windows yet");
  35 
  36     assert(_anchor.last_Java_pc() != NULL, "Ack no pc!");
  37     return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc());
  38   }
  39 
  40   // Sometimes the trap handler needs to record both PC and NPC.
  41   // This is a SPARC-specific companion to Thread::set_saved_exception_pc.
  42   address _saved_exception_npc;
  43 
  44   // In polling_page_safepoint_handler_blob(s) we have to tail call other
  45   // blobs without blowing any registers.  A tail call requires some
  46   // register to jump with and we can't blow any registers, so it must
  47   // be restored in the delay slot.  'restore' cannot be used as it
  48   // will chop the heads off of 64-bit %o registers in the 32-bit
  49   // build.  Instead we reload the registers using G2_thread and this
  50   // location.  Must be 64bits in the 32-bit LION build.
  51   jdouble _o_reg_temps[6];
  52 
  53   // a stack pointer older than any java frame stack pointer.  It is
  54   // used to validate stack pointers in frame::next_younger_sp (it
  55   // provides the upper bound in the range check).  This is necessary
  56   // on Solaris/SPARC since the ucontext passed to a signal handler is
  57   // sometimes corrupt and we need a way to check the extracted sp.
  58   intptr_t* _base_of_stack_pointer;
  59 
  60 public:
  61 
  62   static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); }
  63 
  64 #ifndef _LP64
  65   address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; }
  66 #endif
  67 
  68   static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); }
  69 
  70   address  saved_exception_npc()             { return _saved_exception_npc; }
  71   void set_saved_exception_npc(address a)    { _saved_exception_npc = a; }
  72 
  73 
  74 public:
  75 
  76   intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; }
  77 
  78   void set_base_of_stack_pointer(intptr_t* base_sp) {
  79     _base_of_stack_pointer = base_sp;
  80   }
  81 
  82   void record_base_of_stack_pointer() {
  83     intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()()));
  84     intptr_t *ysp;
  85     while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) {
  86       sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS);
  87     }
  88     _base_of_stack_pointer = sp;
  89   }
  90 
  91   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
  92     bool isInJava);
  93 
  94   // These routines are only used on cpu architectures that
  95   // have separate register stacks (Itanium).
  96   static bool register_stack_overflow() { return false; }
  97   static void enable_register_stack_guard() {}
  98   static void disable_register_stack_guard() {}