1/*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016 SAP SE. 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.
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24 */
25
26#ifndef CPU_S390_VM_REGISTERSAVER_S390_HPP
27#define CPU_S390_VM_REGISTERSAVER_S390_HPP
28
29class RegisterSaver {
30  // Used for saving volatile registers.
31
32  // Class declaration moved to separate file to make it available elsewhere.
33  // Implementation remains in sharedRuntime_s390.cpp
34
35 public:
36
37  // Set of registers to be saved.
38  typedef enum {
39    all_registers,
40    all_registers_except_r2,
41    all_integer_registers,
42    all_volatile_registers, // According to ABI calling convention.
43    arg_registers
44  } RegisterSet;
45
46  // Boolean flags to force only argument registers to be saved.
47  static int live_reg_save_size(RegisterSet reg_set);
48  static int live_reg_frame_size(RegisterSet reg_set);
49  // Specify the register that should be stored as the return pc in the current frame.
50  static OopMap* save_live_registers(MacroAssembler* masm, RegisterSet reg_set, Register return_pc = Z_R14);
51  static void restore_live_registers(MacroAssembler* masm, RegisterSet reg_set);
52
53  // Generate the OopMap (again, regs where saved before).
54  static OopMap* generate_oop_map(MacroAssembler* masm, RegisterSet reg_set);
55
56  // During deoptimization only the result register need to be restored
57  // all the other values have already been extracted.
58  static void restore_result_registers(MacroAssembler* masm);
59
60  // Constants and data structures:
61
62  typedef enum {
63    int_reg           = 0,
64    float_reg         = 1,
65    excluded_reg      = 2,  // Not saved/restored.
66  } RegisterType;
67
68  typedef enum {
69    reg_size          = 8,
70    half_reg_size     = reg_size / 2,
71  } RegisterConstants;
72
73  // Remember type, number, and VMReg.
74  typedef struct {
75    RegisterType        reg_type;
76    int                 reg_num;
77    VMReg               vmreg;
78  } LiveRegType;
79
80};
81
82#endif // CPU_S390_VM_REGISTERSAVER_S390_HPP
83