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 "arch/x86_64/registers_x86_64.h"
23 #include "base/logging.h"
24 #include "base/macros.h"
25 #include "globals.h"
26 
27 namespace art {
28 namespace x86_64 {
29 
30 class CpuRegister {
31  public:
CpuRegister(Register r)32   explicit CpuRegister(Register r) : reg_(r) {}
CpuRegister(int r)33   explicit CpuRegister(int r) : reg_(Register(r)) {}
AsRegister()34   Register AsRegister() const {
35     return reg_;
36   }
LowBits()37   uint8_t LowBits() const {
38     return reg_ & 7;
39   }
NeedsRex()40   bool NeedsRex() const {
41     return reg_ > 7;
42   }
43  private:
44   const Register reg_;
45 };
46 std::ostream& operator<<(std::ostream& os, const CpuRegister& reg);
47 
48 class XmmRegister {
49  public:
XmmRegister(FloatRegister r)50   explicit XmmRegister(FloatRegister r) : reg_(r) {}
XmmRegister(int r)51   explicit XmmRegister(int r) : reg_(FloatRegister(r)) {}
AsFloatRegister()52   FloatRegister AsFloatRegister() const {
53     return reg_;
54   }
LowBits()55   uint8_t LowBits() const {
56     return reg_ & 7;
57   }
NeedsRex()58   bool NeedsRex() const {
59     return reg_ > 7;
60   }
61  private:
62   const FloatRegister reg_;
63 };
64 std::ostream& operator<<(std::ostream& os, const XmmRegister& reg);
65 
66 enum X87Register {
67   ST0 = 0,
68   ST1 = 1,
69   ST2 = 2,
70   ST3 = 3,
71   ST4 = 4,
72   ST5 = 5,
73   ST6 = 6,
74   ST7 = 7,
75   kNumberOfX87Registers = 8,
76   kNoX87Register = -1  // Signals an illegal register.
77 };
78 std::ostream& operator<<(std::ostream& os, const X87Register& reg);
79 
80 enum ScaleFactor {
81   TIMES_1 = 0,
82   TIMES_2 = 1,
83   TIMES_4 = 2,
84   TIMES_8 = 3
85 };
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   kUnordered    = kParityEven
110 };
111 
112 
113 class Instr {
114  public:
115   static const uint8_t kHltInstruction = 0xF4;
116   // We prefer not to use the int3 instruction since it conflicts with gdb.
117   static const uint8_t kBreakPointInstruction = kHltInstruction;
118 
IsBreakPoint()119   bool IsBreakPoint() {
120     return (*reinterpret_cast<const uint8_t*>(this)) == kBreakPointInstruction;
121   }
122 
123   // Instructions are read out of a code stream. The only way to get a
124   // reference to an instruction is to convert a pointer. There is no way
125   // to allocate or create instances of class Instr.
126   // Use the At(pc) function to create references to Instr.
At(uintptr_t pc)127   static Instr* At(uintptr_t pc) { return reinterpret_cast<Instr*>(pc); }
128 
129  private:
130   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
131 };
132 
133 }  // namespace x86_64
134 }  // namespace art
135 
136 #endif  // ART_COMPILER_UTILS_X86_64_CONSTANTS_X86_64_H_
137