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.

    23  *

    24  */

    25 

    26 #ifndef CPU_S390_VM_REGISTERSAVER_S390_HPP

    27 #define CPU_S390_VM_REGISTERSAVER_S390_HPP

    28 

    29 class 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