pred_inst.hh revision 7143
1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2007-2008 The Florida State University 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Stephen Hines 41 */ 42#ifndef __ARCH_ARM_INSTS_PREDINST_HH__ 43#define __ARCH_ARM_INSTS_PREDINST_HH__ 44 45#include "arch/arm/insts/static_inst.hh" 46#include "base/trace.hh" 47 48namespace ArmISA 49{ 50static inline uint32_t 51rotate_imm(uint32_t immValue, int rotateValue) 52{ 53 return ((immValue >> (rotateValue & 31)) | 54 (immValue << (32 - (rotateValue & 31)))); 55} 56 57static inline uint32_t 58modified_imm(uint8_t ctrlImm, uint8_t dataImm) 59{ 60 uint32_t bigData = dataImm; 61 uint32_t bigCtrl = ctrlImm; 62 if (bigCtrl < 4) { 63 switch (bigCtrl) { 64 case 0: 65 return bigData; 66 case 1: 67 return bigData | (bigData << 16); 68 case 2: 69 return (bigData << 8) | (bigData << 24); 70 case 3: 71 return (bigData << 0) | (bigData << 8) | 72 (bigData << 16) | (bigData << 24); 73 } 74 } 75 bigCtrl = (bigCtrl << 1) | ((bigData >> 7) & 0x1); 76 bigData |= (1 << 7); 77 return bigData << (32 - bigCtrl); 78} 79 80 81/** 82 * Base class for predicated integer operations. 83 */ 84class PredOp : public ArmStaticInst 85{ 86 protected: 87 88 ConditionCode condCode; 89 90 /// Constructor 91 PredOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 92 ArmStaticInst(mnem, _machInst, __opClass), 93 condCode((ConditionCode)(unsigned)machInst.condCode) 94 { 95 } 96}; 97 98/** 99 * Base class for predicated immediate operations. 100 */ 101class PredImmOp : public PredOp 102{ 103 protected: 104 105 uint32_t imm; 106 uint32_t rotated_imm; 107 uint32_t rotated_carry; 108 uint32_t rotate; 109 110 /// Constructor 111 PredImmOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 112 PredOp(mnem, _machInst, __opClass), 113 imm(machInst.imm), rotated_imm(0), rotated_carry(0), 114 rotate(machInst.rotate << 1) 115 { 116 rotated_imm = rotate_imm(imm, rotate); 117 if (rotate != 0) 118 rotated_carry = bits(rotated_imm, 31); 119 } 120 121 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 122}; 123 124/** 125 * Base class for predicated integer operations. 126 */ 127class PredIntOp : public PredOp 128{ 129 protected: 130 131 uint32_t shift_size; 132 uint32_t shift; 133 134 /// Constructor 135 PredIntOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 136 PredOp(mnem, _machInst, __opClass), 137 shift_size(machInst.shiftSize), shift(machInst.shift) 138 { 139 } 140 141 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 142}; 143 144class DataImmOp : public PredOp 145{ 146 protected: 147 IntRegIndex dest, op1; 148 uint32_t imm; 149 // Whether the carry flag should be modified if that's an option for 150 // this instruction. 151 bool rotC; 152 153 DataImmOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass, 154 IntRegIndex _dest, IntRegIndex _op1, uint32_t _imm, bool _rotC) : 155 PredOp(mnem, _machInst, __opClass), 156 dest(_dest), op1(_op1), imm(_imm), rotC(_rotC) 157 {} 158 159 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 160}; 161 162class DataRegOp : public PredOp 163{ 164 protected: 165 IntRegIndex dest, op1, op2; 166 int32_t shiftAmt; 167 ArmShiftType shiftType; 168 169 DataRegOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass, 170 IntRegIndex _dest, IntRegIndex _op1, IntRegIndex _op2, 171 int32_t _shiftAmt, ArmShiftType _shiftType) : 172 PredOp(mnem, _machInst, __opClass), 173 dest(_dest), op1(_op1), op2(_op2), 174 shiftAmt(_shiftAmt), shiftType(_shiftType) 175 {} 176 177 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 178}; 179 180class DataRegRegOp : public PredOp 181{ 182 protected: 183 IntRegIndex dest, op1, op2, shift; 184 ArmShiftType shiftType; 185 186 DataRegRegOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass, 187 IntRegIndex _dest, IntRegIndex _op1, IntRegIndex _op2, 188 IntRegIndex _shift, ArmShiftType _shiftType) : 189 PredOp(mnem, _machInst, __opClass), 190 dest(_dest), op1(_op1), op2(_op2), shift(_shift), 191 shiftType(_shiftType) 192 {} 193 194 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 195}; 196 197/** 198 * Base class for predicated macro-operations. 199 */ 200class PredMacroOp : public PredOp 201{ 202 protected: 203 204 uint32_t numMicroops; 205 StaticInstPtr * microOps; 206 207 /// Constructor 208 PredMacroOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 209 PredOp(mnem, _machInst, __opClass), 210 numMicroops(0) 211 { 212 // We rely on the subclasses of this object to handle the 213 // initialization of the micro-operations, since they are 214 // all of variable length 215 flags[IsMacroop] = true; 216 } 217 218 ~PredMacroOp() 219 { 220 if (numMicroops) 221 delete [] microOps; 222 } 223 224 StaticInstPtr 225 fetchMicroop(MicroPC microPC) 226 { 227 assert(microPC < numMicroops); 228 return microOps[microPC]; 229 } 230 231 std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; 232}; 233 234/** 235 * Base class for predicated micro-operations. 236 */ 237class PredMicroop : public PredOp 238{ 239 /// Constructor 240 PredMicroop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 241 PredOp(mnem, _machInst, __opClass) 242 { 243 flags[IsMicroop] = true; 244 } 245}; 246} 247 248#endif //__ARCH_ARM_INSTS_PREDINST_HH__ 249