1 /*

     2  * Copyright 1997-2007 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 i486 {

    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 == i486::get_call_stub_compiled_return(); }