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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 CpuRegister(Register r) : reg_(r) {}
     33   explicit CpuRegister(int r) : reg_(Register(r)) {}
     34   Register AsRegister() const {
     35     return reg_;
     36   }
     37   uint8_t LowBits() const {
     38     return reg_ & 7;
     39   }
     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:
     50   explicit XmmRegister(FloatRegister r) : reg_(r) {}
     51   FloatRegister AsFloatRegister() const {
     52     return reg_;
     53   }
     54   uint8_t LowBits() const {
     55     return reg_ & 7;
     56   }
     57   bool NeedsRex() const {
     58     return reg_ > 7;
     59   }
     60  private:
     61   const FloatRegister reg_;
     62 };
     63 std::ostream& operator<<(std::ostream& os, const XmmRegister& reg);
     64 
     65 enum X87Register {
     66   ST0 = 0,
     67   ST1 = 1,
     68   ST2 = 2,
     69   ST3 = 3,
     70   ST4 = 4,
     71   ST5 = 5,
     72   ST6 = 6,
     73   ST7 = 7,
     74   kNumberOfX87Registers = 8,
     75   kNoX87Register = -1  // Signals an illegal register.
     76 };
     77 std::ostream& operator<<(std::ostream& os, const X87Register& reg);
     78 
     79 enum ScaleFactor {
     80   TIMES_1 = 0,
     81   TIMES_2 = 1,
     82   TIMES_4 = 2,
     83   TIMES_8 = 3
     84 };
     85 
     86 enum Condition {
     87   kOverflow     =  0,
     88   kNoOverflow   =  1,
     89   kBelow        =  2,
     90   kAboveEqual   =  3,
     91   kEqual        =  4,
     92   kNotEqual     =  5,
     93   kBelowEqual   =  6,
     94   kAbove        =  7,
     95   kSign         =  8,
     96   kNotSign      =  9,
     97   kParityEven   = 10,
     98   kParityOdd    = 11,
     99   kLess         = 12,
    100   kGreaterEqual = 13,
    101   kLessEqual    = 14,
    102   kGreater      = 15,
    103 
    104   kZero         = kEqual,
    105   kNotZero      = kNotEqual,
    106   kNegative     = kSign,
    107   kPositive     = kNotSign
    108 };
    109 
    110 
    111 class Instr {
    112  public:
    113   static const uint8_t kHltInstruction = 0xF4;
    114   // We prefer not to use the int3 instruction since it conflicts with gdb.
    115   static const uint8_t kBreakPointInstruction = kHltInstruction;
    116 
    117   bool IsBreakPoint() {
    118     return (*reinterpret_cast<const uint8_t*>(this)) == kBreakPointInstruction;
    119   }
    120 
    121   // Instructions are read out of a code stream. The only way to get a
    122   // reference to an instruction is to convert a pointer. There is no way
    123   // to allocate or create instances of class Instr.
    124   // Use the At(pc) function to create references to Instr.
    125   static Instr* At(uintptr_t pc) { return reinterpret_cast<Instr*>(pc); }
    126 
    127  private:
    128   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
    129 };
    130 
    131 }  // namespace x86_64
    132 }  // namespace art
    133 
    134 #endif  // ART_COMPILER_UTILS_X86_64_CONSTANTS_X86_64_H_
    135