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 }
  52 
  53 
  54 int RegisterMap::link_offset() {
  55   return in_bytes(byte_offset_of(RegisterMap, _location)) + (int)(sizeof(intptr_t*) * rbp->as_VMReg()->value());
  56 }