dyn_inst.hh revision 10259
1/* 2 * Copyright (c) 2010 ARM Limited 3 * Copyright (c) 2013 Advanced Micro Devices, Inc. 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Copyright (c) 2004-2006 The Regents of The University of Michigan 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Kevin Lim 42 */ 43 44#ifndef __CPU_O3_DYN_INST_HH__ 45#define __CPU_O3_DYN_INST_HH__ 46 47#include "arch/isa_traits.hh" 48#include "config/the_isa.hh" 49#include "cpu/o3/cpu.hh" 50#include "cpu/o3/isa_specific.hh" 51#include "cpu/base_dyn_inst.hh" 52#include "cpu/inst_seq.hh" 53#include "cpu/reg_class.hh" 54 55class Packet; 56 57template <class Impl> 58class BaseO3DynInst : public BaseDynInst<Impl> 59{ 60 public: 61 /** Typedef for the CPU. */ 62 typedef typename Impl::O3CPU O3CPU; 63 64 /** Binary machine instruction type. */ 65 typedef TheISA::MachInst MachInst; 66 /** Extended machine instruction type. */ 67 typedef TheISA::ExtMachInst ExtMachInst; 68 /** Logical register index type. */ 69 typedef TheISA::RegIndex RegIndex; 70 /** Integer register index type. */ 71 typedef TheISA::IntReg IntReg; 72 typedef TheISA::FloatReg FloatReg; 73 typedef TheISA::FloatRegBits FloatRegBits; 74#ifdef ISA_HAS_CC_REGS 75 typedef TheISA::CCReg CCReg; 76#endif 77 /** Misc register index type. */ 78 typedef TheISA::MiscReg MiscReg; 79 80 enum { 81 MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs 82 MaxInstDestRegs = TheISA::MaxInstDestRegs //< Max dest regs 83 }; 84 85 public: 86 /** BaseDynInst constructor given a binary instruction. */ 87 BaseO3DynInst(StaticInstPtr staticInst, StaticInstPtr macroop, 88 TheISA::PCState pc, TheISA::PCState predPC, 89 InstSeqNum seq_num, O3CPU *cpu); 90 91 /** BaseDynInst constructor given a static inst pointer. */ 92 BaseO3DynInst(StaticInstPtr _staticInst, StaticInstPtr _macroop); 93 94 ~BaseO3DynInst(); 95 96 /** Executes the instruction.*/ 97 Fault execute(); 98 99 /** Initiates the access. Only valid for memory operations. */ 100 Fault initiateAcc(); 101 102 /** Completes the access. Only valid for memory operations. */ 103 Fault completeAcc(PacketPtr pkt); 104 105 private: 106 /** Initializes variables. */ 107 void initVars(); 108 109 protected: 110 /** Values to be written to the destination misc. registers. */ 111 MiscReg _destMiscRegVal[TheISA::MaxMiscDestRegs]; 112 113 /** Indexes of the destination misc. registers. They are needed to defer 114 * the write accesses to the misc. registers until the commit stage, when 115 * the instruction is out of its speculative state. 116 */ 117 short _destMiscRegIdx[TheISA::MaxMiscDestRegs]; 118 119 /** Number of destination misc. registers. */ 120 uint8_t _numDestMiscRegs; 121 122 123 public: 124#if TRACING_ON 125 /** Tick records used for the pipeline activity viewer. */ 126 Tick fetchTick; // instruction fetch is completed. 127 int32_t decodeTick; // instruction enters decode phase 128 int32_t renameTick; // instruction enters rename phase 129 int32_t dispatchTick; 130 int32_t issueTick; 131 int32_t completeTick; 132 int32_t commitTick; 133 int32_t storeTick; 134#endif 135 136 /** Reads a misc. register, including any side-effects the read 137 * might have as defined by the architecture. 138 */ 139 MiscReg readMiscReg(int misc_reg) 140 { 141 return this->cpu->readMiscReg(misc_reg, this->threadNumber); 142 } 143 144 /** Sets a misc. register, including any side-effects the write 145 * might have as defined by the architecture. 146 */ 147 void setMiscReg(int misc_reg, const MiscReg &val) 148 { 149 /** Writes to misc. registers are recorded and deferred until the 150 * commit stage, when updateMiscRegs() is called. First, check if 151 * the misc reg has been written before and update its value to be 152 * committed instead of making a new entry. If not, make a new 153 * entry and record the write. 154 */ 155 for (int idx = 0; idx < _numDestMiscRegs; idx++) { 156 if (_destMiscRegIdx[idx] == misc_reg) { 157 _destMiscRegVal[idx] = val; 158 return; 159 } 160 } 161 162 assert(_numDestMiscRegs < TheISA::MaxMiscDestRegs); 163 _destMiscRegIdx[_numDestMiscRegs] = misc_reg; 164 _destMiscRegVal[_numDestMiscRegs] = val; 165 _numDestMiscRegs++; 166 } 167 168 /** Reads a misc. register, including any side-effects the read 169 * might have as defined by the architecture. 170 */ 171 TheISA::MiscReg readMiscRegOperand(const StaticInst *si, int idx) 172 { 173 return this->cpu->readMiscReg( 174 si->srcRegIdx(idx) - TheISA::Misc_Reg_Base, 175 this->threadNumber); 176 } 177 178 /** Sets a misc. register, including any side-effects the write 179 * might have as defined by the architecture. 180 */ 181 void setMiscRegOperand(const StaticInst *si, int idx, 182 const MiscReg &val) 183 { 184 int misc_reg = si->destRegIdx(idx) - TheISA::Misc_Reg_Base; 185 setMiscReg(misc_reg, val); 186 } 187 188 /** Called at the commit stage to update the misc. registers. */ 189 void updateMiscRegs() 190 { 191 // @todo: Pretty convoluted way to avoid squashing from happening when 192 // using the TC during an instruction's execution (specifically for 193 // instructions that have side-effects that use the TC). Fix this. 194 // See cpu/o3/dyn_inst_impl.hh. 195 bool no_squash_from_TC = this->thread->noSquashFromTC; 196 this->thread->noSquashFromTC = true; 197 198 for (int i = 0; i < _numDestMiscRegs; i++) 199 this->cpu->setMiscReg( 200 _destMiscRegIdx[i], _destMiscRegVal[i], this->threadNumber); 201 202 this->thread->noSquashFromTC = no_squash_from_TC; 203 } 204 205 void forwardOldRegs() 206 { 207 208 for (int idx = 0; idx < this->numDestRegs(); idx++) { 209 PhysRegIndex prev_phys_reg = this->prevDestRegIdx(idx); 210 TheISA::RegIndex original_dest_reg = 211 this->staticInst->destRegIdx(idx); 212 switch (regIdxToClass(original_dest_reg)) { 213 case IntRegClass: 214 this->setIntRegOperand(this->staticInst.get(), idx, 215 this->cpu->readIntReg(prev_phys_reg)); 216 break; 217 case FloatRegClass: 218 this->setFloatRegOperandBits(this->staticInst.get(), idx, 219 this->cpu->readFloatRegBits(prev_phys_reg)); 220 break; 221 case CCRegClass: 222 this->setCCRegOperand(this->staticInst.get(), idx, 223 this->cpu->readCCReg(prev_phys_reg)); 224 break; 225 case MiscRegClass: 226 // no need to forward misc reg values 227 break; 228 } 229 } 230 } 231 /** Calls hardware return from error interrupt. */ 232 Fault hwrei(); 233 /** Traps to handle specified fault. */ 234 void trap(Fault fault); 235 bool simPalCheck(int palFunc); 236 237 /** Emulates a syscall. */ 238 void syscall(int64_t callnum); 239 240 public: 241 242 // The register accessor methods provide the index of the 243 // instruction's operand (e.g., 0 or 1), not the architectural 244 // register index, to simplify the implementation of register 245 // renaming. We find the architectural register index by indexing 246 // into the instruction's own operand index table. Note that a 247 // raw pointer to the StaticInst is provided instead of a 248 // ref-counted StaticInstPtr to redice overhead. This is fine as 249 // long as these methods don't copy the pointer into any long-term 250 // storage (which is pretty hard to imagine they would have reason 251 // to do). 252 253 uint64_t readIntRegOperand(const StaticInst *si, int idx) 254 { 255 return this->cpu->readIntReg(this->_srcRegIdx[idx]); 256 } 257 258 FloatReg readFloatRegOperand(const StaticInst *si, int idx) 259 { 260 return this->cpu->readFloatReg(this->_srcRegIdx[idx]); 261 } 262 263 FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx) 264 { 265 return this->cpu->readFloatRegBits(this->_srcRegIdx[idx]); 266 } 267 268 uint64_t readCCRegOperand(const StaticInst *si, int idx) 269 { 270 return this->cpu->readCCReg(this->_srcRegIdx[idx]); 271 } 272 273 /** @todo: Make results into arrays so they can handle multiple dest 274 * registers. 275 */ 276 void setIntRegOperand(const StaticInst *si, int idx, uint64_t val) 277 { 278 this->cpu->setIntReg(this->_destRegIdx[idx], val); 279 BaseDynInst<Impl>::setIntRegOperand(si, idx, val); 280 } 281 282 void setFloatRegOperand(const StaticInst *si, int idx, FloatReg val) 283 { 284 this->cpu->setFloatReg(this->_destRegIdx[idx], val); 285 BaseDynInst<Impl>::setFloatRegOperand(si, idx, val); 286 } 287 288 void setFloatRegOperandBits(const StaticInst *si, int idx, 289 FloatRegBits val) 290 { 291 this->cpu->setFloatRegBits(this->_destRegIdx[idx], val); 292 BaseDynInst<Impl>::setFloatRegOperandBits(si, idx, val); 293 } 294 295 void setCCRegOperand(const StaticInst *si, int idx, uint64_t val) 296 { 297 this->cpu->setCCReg(this->_destRegIdx[idx], val); 298 BaseDynInst<Impl>::setCCRegOperand(si, idx, val); 299 } 300 301#if THE_ISA == MIPS_ISA 302 uint64_t readRegOtherThread(int misc_reg) 303 { 304 panic("MIPS MT not defined for O3 CPU.\n"); 305 return 0; 306 } 307 308 void setRegOtherThread(int misc_reg, const TheISA::MiscReg &val) 309 { 310 panic("MIPS MT not defined for O3 CPU.\n"); 311 } 312#endif 313 314 public: 315 /** Calculates EA part of a memory instruction. Currently unused, 316 * though it may be useful in the future if we want to split 317 * memory operations into EA calculation and memory access parts. 318 */ 319 Fault calcEA() 320 { 321 return this->staticInst->eaCompInst()->execute(this, this->traceData); 322 } 323 324 /** Does the memory access part of a memory instruction. Currently unused, 325 * though it may be useful in the future if we want to split 326 * memory operations into EA calculation and memory access parts. 327 */ 328 Fault memAccess() 329 { 330 return this->staticInst->memAccInst()->execute(this, this->traceData); 331 } 332}; 333 334#endif // __CPU_O3_ALPHA_DYN_INST_HH__ 335 336