dyn_inst.hh revision 12420
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 /** Extended machine instruction type. */ 69 typedef TheISA::ExtMachInst ExtMachInst; 70 /** Register types. */ 71 typedef TheISA::IntReg IntReg; 72 typedef TheISA::FloatReg FloatReg; 73 typedef TheISA::FloatRegBits FloatRegBits; 74 typedef TheISA::CCReg CCReg; 75 using VecRegContainer = TheISA::VecRegContainer; 76 using VecElem = TheISA::VecElem; 77 static constexpr auto NumVecElemPerVecReg = TheISA::NumVecElemPerVecReg; 78 79 /** Misc register type. */ 80 typedef TheISA::MiscReg MiscReg; 81 82 enum { 83 MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs 84 MaxInstDestRegs = TheISA::MaxInstDestRegs //< Max dest regs 85 }; 86 87 public: 88 /** BaseDynInst constructor given a binary instruction. */ 89 BaseO3DynInst(const StaticInstPtr &staticInst, const StaticInstPtr 90 ¯oop, TheISA::PCState pc, TheISA::PCState predPC, 91 InstSeqNum seq_num, O3CPU *cpu); 92 93 /** BaseDynInst constructor given a static inst pointer. */ 94 BaseO3DynInst(const StaticInstPtr &_staticInst, 95 const StaticInstPtr &_macroop); 96 97 ~BaseO3DynInst(); 98 99 /** Executes the instruction.*/ 100 Fault execute(); 101 102 /** Initiates the access. Only valid for memory operations. */ 103 Fault initiateAcc(); 104 105 /** Completes the access. Only valid for memory operations. */ 106 Fault completeAcc(PacketPtr pkt); 107 108 private: 109 /** Initializes variables. */ 110 void initVars(); 111 112 protected: 113 /** Explicitation of dependent names. */ 114 using BaseDynInst<Impl>::cpu; 115 using BaseDynInst<Impl>::_srcRegIdx; 116 using BaseDynInst<Impl>::_destRegIdx; 117 118 /** Values to be written to the destination misc. registers. */ 119 std::array<MiscReg, TheISA::MaxMiscDestRegs> _destMiscRegVal; 120 121 /** Indexes of the destination misc. registers. They are needed to defer 122 * the write accesses to the misc. registers until the commit stage, when 123 * the instruction is out of its speculative state. 124 */ 125 std::array<short, TheISA::MaxMiscDestRegs> _destMiscRegIdx; 126 127 /** Number of destination misc. registers. */ 128 uint8_t _numDestMiscRegs; 129 130 131 public: 132#if TRACING_ON 133 /** Tick records used for the pipeline activity viewer. */ 134 Tick fetchTick; // instruction fetch is completed. 135 int32_t decodeTick; // instruction enters decode phase 136 int32_t renameTick; // instruction enters rename phase 137 int32_t dispatchTick; 138 int32_t issueTick; 139 int32_t completeTick; 140 int32_t commitTick; 141 int32_t storeTick; 142#endif 143 144 /** Reads a misc. register, including any side-effects the read 145 * might have as defined by the architecture. 146 */ 147 MiscReg readMiscReg(int misc_reg) 148 { 149 return this->cpu->readMiscReg(misc_reg, this->threadNumber); 150 } 151 152 /** Sets a misc. register, including any side-effects the write 153 * might have as defined by the architecture. 154 */ 155 void setMiscReg(int misc_reg, const MiscReg &val) 156 { 157 /** Writes to misc. registers are recorded and deferred until the 158 * commit stage, when updateMiscRegs() is called. First, check if 159 * the misc reg has been written before and update its value to be 160 * committed instead of making a new entry. If not, make a new 161 * entry and record the write. 162 */ 163 for (int idx = 0; idx < _numDestMiscRegs; idx++) { 164 if (_destMiscRegIdx[idx] == misc_reg) { 165 _destMiscRegVal[idx] = val; 166 return; 167 } 168 } 169 170 assert(_numDestMiscRegs < TheISA::MaxMiscDestRegs); 171 _destMiscRegIdx[_numDestMiscRegs] = misc_reg; 172 _destMiscRegVal[_numDestMiscRegs] = val; 173 _numDestMiscRegs++; 174 } 175 176 /** Reads a misc. register, including any side-effects the read 177 * might have as defined by the architecture. 178 */ 179 TheISA::MiscReg readMiscRegOperand(const StaticInst *si, int idx) 180 { 181 const RegId& reg = si->srcRegIdx(idx); 182 assert(reg.isMiscReg()); 183 return this->cpu->readMiscReg(reg.index(), this->threadNumber); 184 } 185 186 /** Sets a misc. register, including any side-effects the write 187 * might have as defined by the architecture. 188 */ 189 void setMiscRegOperand(const StaticInst *si, int idx, 190 const MiscReg &val) 191 { 192 const RegId& reg = si->destRegIdx(idx); 193 assert(reg.isMiscReg()); 194 setMiscReg(reg.index(), val); 195 } 196 197 /** Called at the commit stage to update the misc. registers. */ 198 void updateMiscRegs() 199 { 200 // @todo: Pretty convoluted way to avoid squashing from happening when 201 // using the TC during an instruction's execution (specifically for 202 // instructions that have side-effects that use the TC). Fix this. 203 // See cpu/o3/dyn_inst_impl.hh. 204 bool no_squash_from_TC = this->thread->noSquashFromTC; 205 this->thread->noSquashFromTC = true; 206 207 for (int i = 0; i < _numDestMiscRegs; i++) 208 this->cpu->setMiscReg( 209 _destMiscRegIdx[i], _destMiscRegVal[i], this->threadNumber); 210 211 this->thread->noSquashFromTC = no_squash_from_TC; 212 } 213 214 void forwardOldRegs() 215 { 216 217 for (int idx = 0; idx < this->numDestRegs(); idx++) { 218 PhysRegIdPtr prev_phys_reg = this->prevDestRegIdx(idx); 219 const RegId& original_dest_reg = 220 this->staticInst->destRegIdx(idx); 221 switch (original_dest_reg.classValue()) { 222 case IntRegClass: 223 this->setIntRegOperand(this->staticInst.get(), idx, 224 this->cpu->readIntReg(prev_phys_reg)); 225 break; 226 case FloatRegClass: 227 this->setFloatRegOperandBits(this->staticInst.get(), idx, 228 this->cpu->readFloatRegBits(prev_phys_reg)); 229 break; 230 case VecRegClass: 231 this->setVecRegOperand(this->staticInst.get(), idx, 232 this->cpu->readVecReg(prev_phys_reg)); 233 break; 234 case VecElemClass: 235 this->setVecElemOperand(this->staticInst.get(), idx, 236 this->cpu->readVecElem(prev_phys_reg)); 237 break; 238 case CCRegClass: 239 this->setCCRegOperand(this->staticInst.get(), idx, 240 this->cpu->readCCReg(prev_phys_reg)); 241 break; 242 case MiscRegClass: 243 // no need to forward misc reg values 244 break; 245 default: 246 panic("Unknown register class: %d", 247 (int)original_dest_reg.classValue()); 248 } 249 } 250 } 251 /** Calls hardware return from error interrupt. */ 252 Fault hwrei(); 253 /** Traps to handle specified fault. */ 254 void trap(const Fault &fault); 255 bool simPalCheck(int palFunc); 256 257 /** Emulates a syscall. */ 258 void syscall(int64_t callnum, Fault *fault); 259 260 public: 261 262 // The register accessor methods provide the index of the 263 // instruction's operand (e.g., 0 or 1), not the architectural 264 // register index, to simplify the implementation of register 265 // renaming. We find the architectural register index by indexing 266 // into the instruction's own operand index table. Note that a 267 // raw pointer to the StaticInst is provided instead of a 268 // ref-counted StaticInstPtr to redice overhead. This is fine as 269 // long as these methods don't copy the pointer into any long-term 270 // storage (which is pretty hard to imagine they would have reason 271 // to do). 272 273 IntReg readIntRegOperand(const StaticInst *si, int idx) 274 { 275 return this->cpu->readIntReg(this->_srcRegIdx[idx]); 276 } 277 278 FloatReg readFloatRegOperand(const StaticInst *si, int idx) 279 { 280 return this->cpu->readFloatReg(this->_srcRegIdx[idx]); 281 } 282 283 FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx) 284 { 285 return this->cpu->readFloatRegBits(this->_srcRegIdx[idx]); 286 } 287 288 const VecRegContainer& 289 readVecRegOperand(const StaticInst *si, int idx) const 290 { 291 return this->cpu->readVecReg(this->_srcRegIdx[idx]); 292 } 293 294 /** 295 * Read destination vector register operand for modification. 296 */ 297 VecRegContainer& 298 getWritableVecRegOperand(const StaticInst *si, int idx) 299 { 300 return this->cpu->getWritableVecReg(this->_destRegIdx[idx]); 301 } 302 303 /** Vector Register Lane Interfaces. */ 304 /** @{ */ 305 /** Reads source vector 8bit operand. */ 306 ConstVecLane8 307 readVec8BitLaneOperand(const StaticInst *si, int idx) const 308 { 309 return cpu->template readVecLane<uint8_t>(_srcRegIdx[idx]); 310 } 311 312 /** Reads source vector 16bit operand. */ 313 ConstVecLane16 314 readVec16BitLaneOperand(const StaticInst *si, int idx) const 315 { 316 return cpu->template readVecLane<uint16_t>(_srcRegIdx[idx]); 317 } 318 319 /** Reads source vector 32bit operand. */ 320 ConstVecLane32 321 readVec32BitLaneOperand(const StaticInst *si, int idx) const 322 { 323 return cpu->template readVecLane<uint32_t>(_srcRegIdx[idx]); 324 } 325 326 /** Reads source vector 64bit operand. */ 327 ConstVecLane64 328 readVec64BitLaneOperand(const StaticInst *si, int idx) const 329 { 330 return cpu->template readVecLane<uint64_t>(_srcRegIdx[idx]); 331 } 332 333 /** Write a lane of the destination vector operand. */ 334 template <typename LD> 335 void 336 setVecLaneOperandT(const StaticInst *si, int idx, const LD& val) 337 { 338 return cpu->template setVecLane(_destRegIdx[idx], val); 339 } 340 virtual void 341 setVecLaneOperand(const StaticInst *si, int idx, 342 const LaneData<LaneSize::Byte>& val) 343 { 344 return setVecLaneOperandT(si, idx, val); 345 } 346 virtual void 347 setVecLaneOperand(const StaticInst *si, int idx, 348 const LaneData<LaneSize::TwoByte>& val) 349 { 350 return setVecLaneOperandT(si, idx, val); 351 } 352 virtual void 353 setVecLaneOperand(const StaticInst *si, int idx, 354 const LaneData<LaneSize::FourByte>& val) 355 { 356 return setVecLaneOperandT(si, idx, val); 357 } 358 virtual void 359 setVecLaneOperand(const StaticInst *si, int idx, 360 const LaneData<LaneSize::EightByte>& val) 361 { 362 return setVecLaneOperandT(si, idx, val); 363 } 364 /** @} */ 365 366 VecElem readVecElemOperand(const StaticInst *si, int idx) const 367 { 368 return this->cpu->readVecElem(this->_srcRegIdx[idx]); 369 } 370 371 CCReg readCCRegOperand(const StaticInst *si, int idx) 372 { 373 return this->cpu->readCCReg(this->_srcRegIdx[idx]); 374 } 375 376 /** @todo: Make results into arrays so they can handle multiple dest 377 * registers. 378 */ 379 void setIntRegOperand(const StaticInst *si, int idx, IntReg val) 380 { 381 this->cpu->setIntReg(this->_destRegIdx[idx], val); 382 BaseDynInst<Impl>::setIntRegOperand(si, idx, val); 383 } 384 385 void setFloatRegOperand(const StaticInst *si, int idx, FloatReg val) 386 { 387 this->cpu->setFloatReg(this->_destRegIdx[idx], val); 388 BaseDynInst<Impl>::setFloatRegOperand(si, idx, val); 389 } 390 391 void setFloatRegOperandBits(const StaticInst *si, int idx, 392 FloatRegBits val) 393 { 394 this->cpu->setFloatRegBits(this->_destRegIdx[idx], val); 395 BaseDynInst<Impl>::setFloatRegOperandBits(si, idx, val); 396 } 397 398 void 399 setVecRegOperand(const StaticInst *si, int idx, 400 const VecRegContainer& val) 401 { 402 this->cpu->setVecReg(this->_destRegIdx[idx], val); 403 BaseDynInst<Impl>::setVecRegOperand(si, idx, val); 404 } 405 406 void setVecElemOperand(const StaticInst *si, int idx, 407 const VecElem val) 408 { 409 int reg_idx = idx; 410 this->cpu->setVecElem(this->_destRegIdx[reg_idx], val); 411 BaseDynInst<Impl>::setVecElemOperand(si, idx, val); 412 } 413 414 void setCCRegOperand(const StaticInst *si, int idx, CCReg val) 415 { 416 this->cpu->setCCReg(this->_destRegIdx[idx], val); 417 BaseDynInst<Impl>::setCCRegOperand(si, idx, val); 418 } 419 420#if THE_ISA == MIPS_ISA 421 MiscReg readRegOtherThread(const RegId& misc_reg, ThreadID tid) 422 { 423 panic("MIPS MT not defined for O3 CPU.\n"); 424 return 0; 425 } 426 427 void setRegOtherThread(const RegId& misc_reg, MiscReg val, ThreadID tid) 428 { 429 panic("MIPS MT not defined for O3 CPU.\n"); 430 } 431#endif 432}; 433 434#endif // __CPU_O3_ALPHA_DYN_INST_HH__ 435 436