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_X86_64_CONSTANTS_X86_64_H_
18 #define ART_COMPILER_UTILS_X86_64_CONSTANTS_X86_64_H_
19 
20 #include <iosfwd>
21 
22 #include <android-base/logging.h>
23 
24 #include "arch/x86_64/registers_x86_64.h"
25 #include "base/globals.h"
26 #include "base/macros.h"
27 
28 namespace art HIDDEN {
29 namespace x86_64 {
30 
31 class CpuRegister {
32  public:
CpuRegister(Register r)33   explicit constexpr CpuRegister(Register r) : reg_(r) {}
CpuRegister(int r)34   explicit constexpr CpuRegister(int r) : reg_(Register(r)) {}
AsRegister()35   constexpr Register AsRegister() const {
36     return reg_;
37   }
38   bool operator==(const CpuRegister& other) const {
39     return reg_ == other.reg_;
40   }
LowBits()41   constexpr uint8_t LowBits() const {
42     return reg_ & 7;
43   }
NeedsRex()44   constexpr bool NeedsRex() const {
45     return reg_ > 7;
46   }
47  private:
48   const Register reg_;
49 };
50 std::ostream& operator<<(std::ostream& os, const CpuRegister& reg);
51 
52 class XmmRegister {
53  public:
XmmRegister(FloatRegister r)54   explicit constexpr XmmRegister(FloatRegister r) : reg_(r) {}
XmmRegister(int r)55   explicit constexpr XmmRegister(int r) : reg_(FloatRegister(r)) {}
AsFloatRegister()56   constexpr FloatRegister AsFloatRegister() const {
57     return reg_;
58   }
LowBits()59   constexpr uint8_t LowBits() const {
60     return reg_ & 7;
61   }
NeedsRex()62   constexpr bool NeedsRex() const {
63     return reg_ > 7;
64   }
65   bool operator==(const XmmRegister& other) const {
66     return reg_ == other.reg_;
67   }
68  private:
69   const FloatRegister reg_;
70 };
71 std::ostream& operator<<(std::ostream& os, const XmmRegister& reg);
72 
73 enum X87Register {
74   ST0 = 0,
75   ST1 = 1,
76   ST2 = 2,
77   ST3 = 3,
78   ST4 = 4,
79   ST5 = 5,
80   ST6 = 6,
81   ST7 = 7,
82   kNumberOfX87Registers = 8,
83   kNoX87Register = -1  // Signals an illegal register.
84 };
85 std::ostream& operator<<(std::ostream& os, const X87Register& reg);
86 
87 enum Condition {
88   kOverflow     =  0,
89   kNoOverflow   =  1,
90   kBelow        =  2,
91   kAboveEqual   =  3,
92   kEqual        =  4,
93   kNotEqual     =  5,
94   kBelowEqual   =  6,
95   kAbove        =  7,
96   kSign         =  8,
97   kNotSign      =  9,
98   kParityEven   = 10,
99   kParityOdd    = 11,
100   kLess         = 12,
101   kGreaterEqual = 13,
102   kLessEqual    = 14,
103   kGreater      = 15,
104 
105   kZero         = kEqual,
106   kNotZero      = kNotEqual,
107   kNegative     = kSign,
108   kPositive     = kNotSign,
109   kCarrySet     = kBelow,
110   kCarryClear   = kAboveEqual,
111   kUnordered    = kParityEven
112 };
113 
114 
115 class Instr {
116  public:
117   static const uint8_t kHltInstruction = 0xF4;
118   // We prefer not to use the int3 instruction since it conflicts with gdb.
119   static const uint8_t kBreakPointInstruction = kHltInstruction;
120 
IsBreakPoint()121   bool IsBreakPoint() {
122     return (*reinterpret_cast<const uint8_t*>(this)) == kBreakPointInstruction;
123   }
124 
125   // Instructions are read out of a code stream. The only way to get a
126   // reference to an instruction is to convert a pointer. There is no way
127   // to allocate or create instances of class Instr.
128   // Use the At(pc) function to create references to Instr.
At(uintptr_t pc)129   static Instr* At(uintptr_t pc) { return reinterpret_cast<Instr*>(pc); }
130 
131  private:
132   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
133 };
134 
135 }  // namespace x86_64
136 }  // namespace art
137 
138 #endif  // ART_COMPILER_UTILS_X86_64_CONSTANTS_X86_64_H_
139