1 /*
   2  * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any 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 enum platform_dependent_constants {
  30   code_size1 =  9000,           // simply increase if too small (assembler will crash if too small)
  31   code_size2 = 22000            // simply increase if too small (assembler will crash if too small)
  32 };
  33 
  34 class x86 {
  35  friend class StubGenerator;
  36  friend class VMStructs;
  37 
  38  private:
  39   // If we call compiled code directly from the call stub we will
  40   // need to adjust the return back to the call stub to a specialized
  41   // piece of code that can handle compiled results and cleaning the fpu
  42   // stack. The variable holds that location.
  43   static address _call_stub_compiled_return;
  44   static address _verify_mxcsr_entry;
  45   static address _verify_fpu_cntrl_wrd_entry;
  46   static jint    _mxcsr_std;
  47 
  48  public:
  49   static address verify_mxcsr_entry()                        { return _verify_mxcsr_entry; }
  50   static address verify_fpu_cntrl_wrd_entry()                { return _verify_fpu_cntrl_wrd_entry; }
  51 
  52   static address get_call_stub_compiled_return()             { return _call_stub_compiled_return; }
  53   static void set_call_stub_compiled_return(address ret)     { _call_stub_compiled_return = ret; }
  54 };
  55 
  56   static bool    returns_to_call_stub(address return_pc)     { return (return_pc == _call_stub_return_address) ||
  57                                                                        return_pc == x86::get_call_stub_compiled_return(); }