1 /*

     2  * Copyright (c) 2015, 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 #include "precompiled.hpp"

    26 #include "runtime/registerMap.hpp"

    27 #include "vmreg_x86.inline.hpp"

    28 

    29 address RegisterMap::pd_location(VMReg reg) const {

    30   if (reg->is_XMMRegister()) {

    31     int regBase = reg->value() - ConcreteRegisterImpl::max_fpr;

    32     if (regBase % 4 == 0) {

    33       // Reads of the low and high 16 byte parts should be handled by location itself

    34       // because they have separate callee saved entries.

    35       // See RegisterSaver::save_live_registers().

    36       return NULL;

    37     }

    38     VMReg baseReg = as_XMMRegister(regBase / XMMRegisterImpl::max_slots_per_register)->as_VMReg();

    39     intptr_t offset = (reg->value() - baseReg->value()) * VMRegImpl::stack_slot_size; // offset in bytes

    40     if (offset >= 16) {

    41       // The high part of YMM registers are saved in a their own area in the frame

    42       baseReg = baseReg->next()->next()->next()->next();

    43       offset -= 16;

    44     }

    45     address baseLocation = location(baseReg);

    46     if (baseLocation != NULL) {

    47       return baseLocation + offset;

    48     }

    49   }

    50   return NULL;

    51 }