1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_COMPILER_UTILS_MIPS64_CONSTANTS_MIPS64_H_
18#define ART_COMPILER_UTILS_MIPS64_CONSTANTS_MIPS64_H_
19
20#include <iosfwd>
21
22#include "arch/mips64/registers_mips64.h"
23#include "base/logging.h"
24#include "base/macros.h"
25#include "globals.h"
26
27namespace art {
28namespace mips64 {
29
30// Constants used for the decoding or encoding of the individual fields of instructions.
31enum InstructionFields {
32  kOpcodeShift = 26,
33  kOpcodeBits = 6,
34  kRsShift = 21,
35  kRsBits = 5,
36  kRtShift = 16,
37  kRtBits = 5,
38  kRdShift = 11,
39  kRdBits = 5,
40  kShamtShift = 6,
41  kShamtBits = 5,
42  kFunctShift = 0,
43  kFunctBits = 6,
44
45  kFmtShift = 21,
46  kFmtBits = 5,
47  kFtShift = 16,
48  kFtBits = 5,
49  kFsShift = 11,
50  kFsBits = 5,
51  kFdShift = 6,
52  kFdBits = 5,
53
54  kBranchOffsetMask = 0x0000ffff,
55  kJumpOffsetMask = 0x03ffffff,
56};
57
58enum ScaleFactor {
59  TIMES_1 = 0,
60  TIMES_2 = 1,
61  TIMES_4 = 2,
62  TIMES_8 = 3
63};
64
65class Instr {
66 public:
67  static const uint32_t kBreakPointInstruction = 0x0000000D;
68
69  bool IsBreakPoint() {
70    return ((*reinterpret_cast<const uint32_t*>(this)) & 0xFC00003F) == kBreakPointInstruction;
71  }
72
73  // Instructions are read out of a code stream. The only way to get a
74  // reference to an instruction is to convert a pointer. There is no way
75  // to allocate or create instances of class Instr.
76  // Use the At(pc) function to create references to Instr.
77  static Instr* At(uintptr_t pc) { return reinterpret_cast<Instr*>(pc); }
78
79 private:
80  DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
81};
82
83}  // namespace mips64
84}  // namespace art
85
86#endif  // ART_COMPILER_UTILS_MIPS64_CONSTANTS_MIPS64_H_
87