dyn_inst.hh revision 13611:c8b7847b4171
1/* 2 * Copyright (c) 2010, 2016 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 <array> 48 49#include "arch/isa_traits.hh" 50#include "config/the_isa.hh" 51#include "cpu/o3/cpu.hh" 52#include "cpu/o3/isa_specific.hh" 53#include "cpu/base_dyn_inst.hh" 54#include "cpu/inst_seq.hh" 55#include "cpu/reg_class.hh" 56 57class Packet; 58 59template <class Impl> 60class BaseO3DynInst : public BaseDynInst<Impl> 61{ 62 public: 63 /** Typedef for the CPU. */ 64 typedef typename Impl::O3CPU O3CPU; 65 66 /** Binary machine instruction type. */ 67 typedef TheISA::MachInst MachInst; 68 /** Register types. */ 69 typedef TheISA::CCReg CCReg; 70 using VecRegContainer = TheISA::VecRegContainer; 71 using VecElem = TheISA::VecElem; 72 static constexpr auto NumVecElemPerVecReg = TheISA::NumVecElemPerVecReg; 73 using VecPredRegContainer = TheISA::VecPredRegContainer; 74 75 enum { 76 MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs 77 MaxInstDestRegs = TheISA::MaxInstDestRegs //< Max dest regs 78 }; 79 80 public: 81 /** BaseDynInst constructor given a binary instruction. */ 82 BaseO3DynInst(const StaticInstPtr &staticInst, const StaticInstPtr 83 ¯oop, TheISA::PCState pc, TheISA::PCState predPC, 84 InstSeqNum seq_num, O3CPU *cpu); 85 86 /** BaseDynInst constructor given a static inst pointer. */ 87 BaseO3DynInst(const StaticInstPtr &_staticInst, 88 const StaticInstPtr &_macroop); 89 90 ~BaseO3DynInst(); 91 92 /** Executes the instruction.*/ 93 Fault execute(); 94 95 /** Initiates the access. Only valid for memory operations. */ 96 Fault initiateAcc(); 97 98 /** Completes the access. Only valid for memory operations. */ 99 Fault completeAcc(PacketPtr pkt); 100 101 private: 102 /** Initializes variables. */ 103 void initVars(); 104 105 protected: 106 /** Explicitation of dependent names. */ 107 using BaseDynInst<Impl>::cpu; 108 using BaseDynInst<Impl>::_srcRegIdx; 109 using BaseDynInst<Impl>::_destRegIdx; 110 111 /** Values to be written to the destination misc. registers. */ 112 std::array<RegVal, TheISA::MaxMiscDestRegs> _destMiscRegVal; 113 114 /** Indexes of the destination misc. registers. They are needed to defer 115 * the write accesses to the misc. registers until the commit stage, when 116 * the instruction is out of its speculative state. 117 */ 118 std::array<short, TheISA::MaxMiscDestRegs> _destMiscRegIdx; 119 120 /** Number of destination misc. registers. */ 121 uint8_t _numDestMiscRegs; 122 123 124 public: 125#if TRACING_ON 126 /** Tick records used for the pipeline activity viewer. */ 127 Tick fetchTick; // instruction fetch is completed. 128 int32_t decodeTick; // instruction enters decode phase 129 int32_t renameTick; // instruction enters rename phase 130 int32_t dispatchTick; 131 int32_t issueTick; 132 int32_t completeTick; 133 int32_t commitTick; 134 int32_t storeTick; 135#endif 136 137 /** Reads a misc. register, including any side-effects the read 138 * might have as defined by the architecture. 139 */ 140 RegVal 141 readMiscReg(int misc_reg) 142 { 143 return this->cpu->readMiscReg(misc_reg, this->threadNumber); 144 } 145 146 /** Sets a misc. register, including any side-effects the write 147 * might have as defined by the architecture. 148 */ 149 void 150 setMiscReg(int misc_reg, RegVal val) 151 { 152 /** Writes to misc. registers are recorded and deferred until the 153 * commit stage, when updateMiscRegs() is called. First, check if 154 * the misc reg has been written before and update its value to be 155 * committed instead of making a new entry. If not, make a new 156 * entry and record the write. 157 */ 158 for (int idx = 0; idx < _numDestMiscRegs; idx++) { 159 if (_destMiscRegIdx[idx] == misc_reg) { 160 _destMiscRegVal[idx] = val; 161 return; 162 } 163 } 164 165 assert(_numDestMiscRegs < TheISA::MaxMiscDestRegs); 166 _destMiscRegIdx[_numDestMiscRegs] = misc_reg; 167 _destMiscRegVal[_numDestMiscRegs] = val; 168 _numDestMiscRegs++; 169 } 170 171 /** Reads a misc. register, including any side-effects the read 172 * might have as defined by the architecture. 173 */ 174 RegVal 175 readMiscRegOperand(const StaticInst *si, int idx) 176 { 177 const RegId& reg = si->srcRegIdx(idx); 178 assert(reg.isMiscReg()); 179 return this->cpu->readMiscReg(reg.index(), this->threadNumber); 180 } 181 182 /** Sets a misc. register, including any side-effects the write 183 * might have as defined by the architecture. 184 */ 185 void 186 setMiscRegOperand(const StaticInst *si, int idx, RegVal val) 187 { 188 const RegId& reg = si->destRegIdx(idx); 189 assert(reg.isMiscReg()); 190 setMiscReg(reg.index(), val); 191 } 192 193 /** Called at the commit stage to update the misc. registers. */ 194 void 195 updateMiscRegs() 196 { 197 // @todo: Pretty convoluted way to avoid squashing from happening when 198 // using the TC during an instruction's execution (specifically for 199 // instructions that have side-effects that use the TC). Fix this. 200 // See cpu/o3/dyn_inst_impl.hh. 201 bool no_squash_from_TC = this->thread->noSquashFromTC; 202 this->thread->noSquashFromTC = true; 203 204 for (int i = 0; i < _numDestMiscRegs; i++) 205 this->cpu->setMiscReg( 206 _destMiscRegIdx[i], _destMiscRegVal[i], this->threadNumber); 207 208 this->thread->noSquashFromTC = no_squash_from_TC; 209 } 210 211 void forwardOldRegs() 212 { 213 214 for (int idx = 0; idx < this->numDestRegs(); idx++) { 215 PhysRegIdPtr prev_phys_reg = this->prevDestRegIdx(idx); 216 const RegId& original_dest_reg = 217 this->staticInst->destRegIdx(idx); 218 switch (original_dest_reg.classValue()) { 219 case IntRegClass: 220 this->setIntRegOperand(this->staticInst.get(), idx, 221 this->cpu->readIntReg(prev_phys_reg)); 222 break; 223 case FloatRegClass: 224 this->setFloatRegOperandBits(this->staticInst.get(), idx, 225 this->cpu->readFloatReg(prev_phys_reg)); 226 break; 227 case VecRegClass: 228 this->setVecRegOperand(this->staticInst.get(), idx, 229 this->cpu->readVecReg(prev_phys_reg)); 230 break; 231 case VecElemClass: 232 this->setVecElemOperand(this->staticInst.get(), idx, 233 this->cpu->readVecElem(prev_phys_reg)); 234 break; 235 case VecPredRegClass: 236 this->setVecPredRegOperand(this->staticInst.get(), idx, 237 this->cpu->readVecPredReg(prev_phys_reg)); 238 break; 239 case CCRegClass: 240 this->setCCRegOperand(this->staticInst.get(), idx, 241 this->cpu->readCCReg(prev_phys_reg)); 242 break; 243 case MiscRegClass: 244 // no need to forward misc reg values 245 break; 246 default: 247 panic("Unknown register class: %d", 248 (int)original_dest_reg.classValue()); 249 } 250 } 251 } 252 /** Calls hardware return from error interrupt. */ 253 Fault hwrei(); 254 /** Traps to handle specified fault. */ 255 void trap(const Fault &fault); 256 bool simPalCheck(int palFunc); 257 258 /** Emulates a syscall. */ 259 void syscall(int64_t callnum, Fault *fault); 260 261 public: 262 263 // The register accessor methods provide the index of the 264 // instruction's operand (e.g., 0 or 1), not the architectural 265 // register index, to simplify the implementation of register 266 // renaming. We find the architectural register index by indexing 267 // into the instruction's own operand index table. Note that a 268 // raw pointer to the StaticInst is provided instead of a 269 // ref-counted StaticInstPtr to redice overhead. This is fine as 270 // long as these methods don't copy the pointer into any long-term 271 // storage (which is pretty hard to imagine they would have reason 272 // to do). 273 274 RegVal 275 readIntRegOperand(const StaticInst *si, int idx) 276 { 277 return this->cpu->readIntReg(this->_srcRegIdx[idx]); 278 } 279 280 RegVal 281 readFloatRegOperandBits(const StaticInst *si, int idx) 282 { 283 return this->cpu->readFloatReg(this->_srcRegIdx[idx]); 284 } 285 286 const VecRegContainer& 287 readVecRegOperand(const StaticInst *si, int idx) const 288 { 289 return this->cpu->readVecReg(this->_srcRegIdx[idx]); 290 } 291 292 /** 293 * Read destination vector register operand for modification. 294 */ 295 VecRegContainer& 296 getWritableVecRegOperand(const StaticInst *si, int idx) 297 { 298 return this->cpu->getWritableVecReg(this->_destRegIdx[idx]); 299 } 300 301 /** Vector Register Lane Interfaces. */ 302 /** @{ */ 303 /** Reads source vector 8bit operand. */ 304 ConstVecLane8 305 readVec8BitLaneOperand(const StaticInst *si, int idx) const 306 { 307 return cpu->template readVecLane<uint8_t>(_srcRegIdx[idx]); 308 } 309 310 /** Reads source vector 16bit operand. */ 311 ConstVecLane16 312 readVec16BitLaneOperand(const StaticInst *si, int idx) const 313 { 314 return cpu->template readVecLane<uint16_t>(_srcRegIdx[idx]); 315 } 316 317 /** Reads source vector 32bit operand. */ 318 ConstVecLane32 319 readVec32BitLaneOperand(const StaticInst *si, int idx) const 320 { 321 return cpu->template readVecLane<uint32_t>(_srcRegIdx[idx]); 322 } 323 324 /** Reads source vector 64bit operand. */ 325 ConstVecLane64 326 readVec64BitLaneOperand(const StaticInst *si, int idx) const 327 { 328 return cpu->template readVecLane<uint64_t>(_srcRegIdx[idx]); 329 } 330 331 /** Write a lane of the destination vector operand. */ 332 template <typename LD> 333 void 334 setVecLaneOperandT(const StaticInst *si, int idx, const LD& val) 335 { 336 return cpu->template setVecLane(_destRegIdx[idx], val); 337 } 338 virtual void 339 setVecLaneOperand(const StaticInst *si, int idx, 340 const LaneData<LaneSize::Byte>& val) 341 { 342 return setVecLaneOperandT(si, idx, val); 343 } 344 virtual void 345 setVecLaneOperand(const StaticInst *si, int idx, 346 const LaneData<LaneSize::TwoByte>& val) 347 { 348 return setVecLaneOperandT(si, idx, val); 349 } 350 virtual void 351 setVecLaneOperand(const StaticInst *si, int idx, 352 const LaneData<LaneSize::FourByte>& val) 353 { 354 return setVecLaneOperandT(si, idx, val); 355 } 356 virtual void 357 setVecLaneOperand(const StaticInst *si, int idx, 358 const LaneData<LaneSize::EightByte>& val) 359 { 360 return setVecLaneOperandT(si, idx, val); 361 } 362 /** @} */ 363 364 VecElem readVecElemOperand(const StaticInst *si, int idx) const 365 { 366 return this->cpu->readVecElem(this->_srcRegIdx[idx]); 367 } 368 369 const VecPredRegContainer& 370 readVecPredRegOperand(const StaticInst *si, int idx) const override 371 { 372 return this->cpu->readVecPredReg(this->_srcRegIdx[idx]); 373 } 374 375 VecPredRegContainer& 376 getWritableVecPredRegOperand(const StaticInst *si, int idx) override 377 { 378 return this->cpu->getWritableVecPredReg(this->_destRegIdx[idx]); 379 } 380 381 CCReg readCCRegOperand(const StaticInst *si, int idx) 382 { 383 return this->cpu->readCCReg(this->_srcRegIdx[idx]); 384 } 385 386 /** @todo: Make results into arrays so they can handle multiple dest 387 * registers. 388 */ 389 void 390 setIntRegOperand(const StaticInst *si, int idx, RegVal val) 391 { 392 this->cpu->setIntReg(this->_destRegIdx[idx], val); 393 BaseDynInst<Impl>::setIntRegOperand(si, idx, val); 394 } 395 396 void 397 setFloatRegOperandBits(const StaticInst *si, int idx, RegVal val) 398 { 399 this->cpu->setFloatReg(this->_destRegIdx[idx], val); 400 BaseDynInst<Impl>::setFloatRegOperandBits(si, idx, val); 401 } 402 403 void 404 setVecRegOperand(const StaticInst *si, int idx, 405 const VecRegContainer& val) 406 { 407 this->cpu->setVecReg(this->_destRegIdx[idx], val); 408 BaseDynInst<Impl>::setVecRegOperand(si, idx, val); 409 } 410 411 void setVecElemOperand(const StaticInst *si, int idx, 412 const VecElem val) 413 { 414 int reg_idx = idx; 415 this->cpu->setVecElem(this->_destRegIdx[reg_idx], val); 416 BaseDynInst<Impl>::setVecElemOperand(si, idx, val); 417 } 418 419 void 420 setVecPredRegOperand(const StaticInst *si, int idx, 421 const VecPredRegContainer& val) override 422 { 423 this->cpu->setVecPredReg(this->_destRegIdx[idx], val); 424 BaseDynInst<Impl>::setVecPredRegOperand(si, idx, val); 425 } 426 427 void setCCRegOperand(const StaticInst *si, int idx, CCReg val) 428 { 429 this->cpu->setCCReg(this->_destRegIdx[idx], val); 430 BaseDynInst<Impl>::setCCRegOperand(si, idx, val); 431 } 432 433#if THE_ISA == MIPS_ISA 434 RegVal 435 readRegOtherThread(const RegId& misc_reg, ThreadID tid) 436 { 437 panic("MIPS MT not defined for O3 CPU.\n"); 438 return 0; 439 } 440 441 void 442 setRegOtherThread(const RegId& misc_reg, RegVal val, ThreadID tid) 443 { 444 panic("MIPS MT not defined for O3 CPU.\n"); 445 } 446#endif 447}; 448 449#endif // __CPU_O3_ALPHA_DYN_INST_HH__ 450 451