1 /*
   2  * Copyright (c) 1997, 2010, 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 // This file holds the platform specific parts of the StubRoutines
  26 // definition. See stubRoutines.hpp for a description on how to
  27 // extend it.
  28 
  29 
  30 // So unfortunately c2 will call with a pc from a frame object
  31 // (already adjusted) and a raw pc (unadjusted), so we need to check both.
  32 // It didn't use to be like this before adapter removal.
  33 static bool returns_to_call_stub(address return_pc)   {
  34   return ((return_pc + frame::pc_return_offset) == _call_stub_return_address) ||
  35           (return_pc == _call_stub_return_address );
  36 }
  37 
  38 enum /* platform_dependent_constants */ {
  39   // %%%%%%%% May be able to shrink this a lot
  40   code_size1 = 20000,           // simply increase if too small (assembler will crash if too small)
  41   code_size2 = 20000            // simply increase if too small (assembler will crash if too small)
  42 };
  43 
  44 // MethodHandles adapters
  45 enum method_handles_platform_dependent_constants {
  46   method_handles_adapters_code_size = 12000
  47 };
  48 
  49 class Sparc {
  50  friend class StubGenerator;
  51 
  52  public:
  53   enum { nof_instance_allocators = 10 };
  54 
  55   // allocator lock values
  56   enum {
  57     unlocked = 0,
  58     locked   = 1
  59   };
  60 
  61   enum {
  62     v8_oop_lock_ignore_bits = 2,
  63     v8_oop_lock_bits = 4,
  64     nof_v8_oop_lock_cache_entries = 1 << (v8_oop_lock_bits+v8_oop_lock_ignore_bits),
  65     v8_oop_lock_mask = right_n_bits(v8_oop_lock_bits),
  66     v8_oop_lock_mask_in_place = v8_oop_lock_mask << v8_oop_lock_ignore_bits
  67   };
  68 
  69   static int _v8_oop_lock_cache[nof_v8_oop_lock_cache_entries];
  70 
  71  private:
  72   static address _test_stop_entry;
  73   static address _stop_subroutine_entry;
  74   static address _flush_callers_register_windows_entry;
  75 
  76   static int _atomic_memory_operation_lock;
  77 
  78   static address _partial_subtype_check;
  79 
  80  public:
  81   // %%% global lock for everyone who needs to use atomic_compare_and_exchange
  82   // %%% or atomic_increment -- should probably use more locks for more
  83   // %%% scalability-- for instance one for each eden space or group of
  84 
  85   // address of the lock for atomic_compare_and_exchange
  86   static int* atomic_memory_operation_lock_addr() { return &_atomic_memory_operation_lock; }
  87 
  88   // accessor and mutator for _atomic_memory_operation_lock
  89   static int atomic_memory_operation_lock() { return _atomic_memory_operation_lock; }
  90   static void set_atomic_memory_operation_lock(int value) { _atomic_memory_operation_lock = value; }
  91 
  92   // test assembler stop routine by setting registers
  93   static void (*test_stop_entry()) ()                     { return CAST_TO_FN_PTR(void (*)(void), _test_stop_entry); }
  94 
  95   // a subroutine for debugging assembler code
  96   static address stop_subroutine_entry_address()          { return (address)&_stop_subroutine_entry; }
  97 
  98   // flushes (all but current) register window
  99   static intptr_t* (*flush_callers_register_windows_func())() { return CAST_TO_FN_PTR(intptr_t* (*)(void), _flush_callers_register_windows_entry); }
 100 
 101   static address partial_subtype_check()                  { return _partial_subtype_check; }
 102 };