1 /*
 2  * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
 3  * Copyright (c) 2021, Arm Limited. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  */
24 
25 #include "precompiled.hpp"
26 #include "runtime/registerMap.hpp"
27 #include "vmreg_aarch64.inline.hpp"
28 
29 address RegisterMap::pd_location(VMReg base_reg, int slot_idx) const {
30   if (base_reg->is_FloatRegister()) {
31     // Not all physical slots of an SVE register have corresponding
32     // VMRegs. However they are always saved to the stack in a
33     // contiguous region of memory so we can calculate the address of
34     // the upper slots by offsetting from the base address.
35     assert(base_reg->is_concrete(), "must pass base reg");
36     int base_reg_enc = (base_reg->value() - ConcreteRegisterImpl::max_gpr) /
37                        FloatRegisterImpl::max_slots_per_register;
38     intptr_t offset_in_bytes = slot_idx * VMRegImpl::stack_slot_size;
39     address base_location = location(base_reg, (intptr_t*)NULL);
40     if (base_location != NULL) {
41       return base_location + offset_in_bytes;
42     } else {
43       return NULL;
44     }
45   } else {
46     return location(base_reg->next(slot_idx), (intptr_t*)NULL);
47   }
48 }