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
pd_location(VMReg reg) const29 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