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      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:
     32   explicit constexpr CpuRegister(Register r) : reg_(r) {}
     33   explicit constexpr CpuRegister(int r) : reg_(Register(r)) {}
     34   constexpr Register AsRegister() const {
     35     return reg_;
     36   }
     37   constexpr uint8_t LowBits() const {
     38     return reg_ & 7;
     39   }
     40   constexpr 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:
     50   explicit constexpr XmmRegister(FloatRegister r) : reg_(r) {}
     51   explicit constexpr XmmRegister(int r) : reg_(FloatRegister(r)) {}
     52   constexpr FloatRegister AsFloatRegister() const {
     53     return reg_;
     54   }
     55   constexpr uint8_t LowBits() const {
     56     return reg_ & 7;
     57   }
     58   constexpr 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   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 
    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.
    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