dyn_inst.hh revision 13582:989577bf6abc
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 74 enum { 75 MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs 76 MaxInstDestRegs = TheISA::MaxInstDestRegs //< Max dest regs 77 }; 78 79 public: 80 /** BaseDynInst constructor given a binary instruction. */ 81 BaseO3DynInst(const StaticInstPtr &staticInst, const StaticInstPtr 82 ¯oop, TheISA::PCState pc, TheISA::PCState predPC, 83 InstSeqNum seq_num, O3CPU *cpu); 84 85 /** BaseDynInst constructor given a static inst pointer. */ 86 BaseO3DynInst(const StaticInstPtr &_staticInst, 87 const StaticInstPtr &_macroop); 88 89 ~BaseO3DynInst(); 90 91 /** Executes the instruction.*/ 92 Fault execute(); 93 94 /** Initiates the access. Only valid for memory operations. */ 95 Fault initiateAcc(); 96 97 /** Completes the access. Only valid for memory operations. */ 98 Fault completeAcc(PacketPtr pkt); 99 100 private: 101 /** Initializes variables. */ 102 void initVars(); 103 104 protected: 105 /** Explicitation of dependent names. */ 106 using BaseDynInst<Impl>::cpu; 107 using BaseDynInst<Impl>::_srcRegIdx; 108 using BaseDynInst<Impl>::_destRegIdx; 109 110 /** Values to be written to the destination misc. registers. */ 111 std::array<RegVal, TheISA::MaxMiscDestRegs> _destMiscRegVal; 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 std::array<short, TheISA::MaxMiscDestRegs> _destMiscRegIdx; 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 RegVal 140 readMiscReg(int misc_reg) 141 { 142 return this->cpu->readMiscReg(misc_reg, this->threadNumber); 143 } 144 145 /** Sets a misc. register, including any side-effects the write 146 * might have as defined by the architecture. 147 */ 148 void 149 setMiscReg(int misc_reg, RegVal val) 150 { 151 /** Writes to misc. registers are recorded and deferred until the 152 * commit stage, when updateMiscRegs() is called. First, check if 153 * the misc reg has been written before and update its value to be 154 * committed instead of making a new entry. If not, make a new 155 * entry and record the write. 156 */ 157 for (int idx = 0; idx < _numDestMiscRegs; idx++) { 158 if (_destMiscRegIdx[idx] == misc_reg) { 159 _destMiscRegVal[idx] = val; 160 return; 161 } 162 } 163 164 assert(_numDestMiscRegs < TheISA::MaxMiscDestRegs); 165 _destMiscRegIdx[_numDestMiscRegs] = misc_reg; 166 _destMiscRegVal[_numDestMiscRegs] = val; 167 _numDestMiscRegs++; 168 } 169 170 /** Reads a misc. register, including any side-effects the read 171 * might have as defined by the architecture. 172 */ 173 RegVal 174 readMiscRegOperand(const StaticInst *si, int idx) 175 { 176 const RegId& reg = si->srcRegIdx(idx); 177 assert(reg.isMiscReg()); 178 return this->cpu->readMiscReg(reg.index(), this->threadNumber); 179 } 180 181 /** Sets a misc. register, including any side-effects the write 182 * might have as defined by the architecture. 183 */ 184 void 185 setMiscRegOperand(const StaticInst *si, int idx, RegVal val) 186 { 187 const RegId& reg = si->destRegIdx(idx); 188 assert(reg.isMiscReg()); 189 setMiscReg(reg.index(), val); 190 } 191 192 /** Called at the commit stage to update the misc. registers. */ 193 void 194 updateMiscRegs() 195 { 196 // @todo: Pretty convoluted way to avoid squashing from happening when 197 // using the TC during an instruction's execution (specifically for 198 // instructions that have side-effects that use the TC). Fix this. 199 // See cpu/o3/dyn_inst_impl.hh. 200 bool no_squash_from_TC = this->thread->noSquashFromTC; 201 this->thread->noSquashFromTC = true; 202 203 for (int i = 0; i < _numDestMiscRegs; i++) 204 this->cpu->setMiscReg( 205 _destMiscRegIdx[i], _destMiscRegVal[i], this->threadNumber); 206 207 this->thread->noSquashFromTC = no_squash_from_TC; 208 } 209 210 void forwardOldRegs() 211 { 212 213 for (int idx = 0; idx < this->numDestRegs(); idx++) { 214 PhysRegIdPtr prev_phys_reg = this->prevDestRegIdx(idx); 215 const RegId& original_dest_reg = 216 this->staticInst->destRegIdx(idx); 217 switch (original_dest_reg.classValue()) { 218 case IntRegClass: 219 this->setIntRegOperand(this->staticInst.get(), idx, 220 this->cpu->readIntReg(prev_phys_reg)); 221 break; 222 case FloatRegClass: 223 this->setFloatRegOperandBits(this->staticInst.get(), idx, 224 this->cpu->readFloatRegBits(prev_phys_reg)); 225 break; 226 case VecRegClass: 227 this->setVecRegOperand(this->staticInst.get(), idx, 228 this->cpu->readVecReg(prev_phys_reg)); 229 break; 230 case VecElemClass: 231 this->setVecElemOperand(this->staticInst.get(), idx, 232 this->cpu->readVecElem(prev_phys_reg)); 233 break; 234 case CCRegClass: 235 this->setCCRegOperand(this->staticInst.get(), idx, 236 this->cpu->readCCReg(prev_phys_reg)); 237 break; 238 case MiscRegClass: 239 // no need to forward misc reg values 240 break; 241 default: 242 panic("Unknown register class: %d", 243 (int)original_dest_reg.classValue()); 244 } 245 } 246 } 247 /** Calls hardware return from error interrupt. */ 248 Fault hwrei(); 249 /** Traps to handle specified fault. */ 250 void trap(const Fault &fault); 251 bool simPalCheck(int palFunc); 252 253 /** Emulates a syscall. */ 254 void syscall(int64_t callnum, Fault *fault); 255 256 public: 257 258 // The register accessor methods provide the index of the 259 // instruction's operand (e.g., 0 or 1), not the architectural 260 // register index, to simplify the implementation of register 261 // renaming. We find the architectural register index by indexing 262 // into the instruction's own operand index table. Note that a 263 // raw pointer to the StaticInst is provided instead of a 264 // ref-counted StaticInstPtr to redice overhead. This is fine as 265 // long as these methods don't copy the pointer into any long-term 266 // storage (which is pretty hard to imagine they would have reason 267 // to do). 268 269 RegVal 270 readIntRegOperand(const StaticInst *si, int idx) 271 { 272 return this->cpu->readIntReg(this->_srcRegIdx[idx]); 273 } 274 275 RegVal 276 readFloatRegOperandBits(const StaticInst *si, int idx) 277 { 278 return this->cpu->readFloatRegBits(this->_srcRegIdx[idx]); 279 } 280 281 const VecRegContainer& 282 readVecRegOperand(const StaticInst *si, int idx) const 283 { 284 return this->cpu->readVecReg(this->_srcRegIdx[idx]); 285 } 286 287 /** 288 * Read destination vector register operand for modification. 289 */ 290 VecRegContainer& 291 getWritableVecRegOperand(const StaticInst *si, int idx) 292 { 293 return this->cpu->getWritableVecReg(this->_destRegIdx[idx]); 294 } 295 296 /** Vector Register Lane Interfaces. */ 297 /** @{ */ 298 /** Reads source vector 8bit operand. */ 299 ConstVecLane8 300 readVec8BitLaneOperand(const StaticInst *si, int idx) const 301 { 302 return cpu->template readVecLane<uint8_t>(_srcRegIdx[idx]); 303 } 304 305 /** Reads source vector 16bit operand. */ 306 ConstVecLane16 307 readVec16BitLaneOperand(const StaticInst *si, int idx) const 308 { 309 return cpu->template readVecLane<uint16_t>(_srcRegIdx[idx]); 310 } 311 312 /** Reads source vector 32bit operand. */ 313 ConstVecLane32 314 readVec32BitLaneOperand(const StaticInst *si, int idx) const 315 { 316 return cpu->template readVecLane<uint32_t>(_srcRegIdx[idx]); 317 } 318 319 /** Reads source vector 64bit operand. */ 320 ConstVecLane64 321 readVec64BitLaneOperand(const StaticInst *si, int idx) const 322 { 323 return cpu->template readVecLane<uint64_t>(_srcRegIdx[idx]); 324 } 325 326 /** Write a lane of the destination vector operand. */ 327 template <typename LD> 328 void 329 setVecLaneOperandT(const StaticInst *si, int idx, const LD& val) 330 { 331 return cpu->template setVecLane(_destRegIdx[idx], val); 332 } 333 virtual void 334 setVecLaneOperand(const StaticInst *si, int idx, 335 const LaneData<LaneSize::Byte>& val) 336 { 337 return setVecLaneOperandT(si, idx, val); 338 } 339 virtual void 340 setVecLaneOperand(const StaticInst *si, int idx, 341 const LaneData<LaneSize::TwoByte>& val) 342 { 343 return setVecLaneOperandT(si, idx, val); 344 } 345 virtual void 346 setVecLaneOperand(const StaticInst *si, int idx, 347 const LaneData<LaneSize::FourByte>& val) 348 { 349 return setVecLaneOperandT(si, idx, val); 350 } 351 virtual void 352 setVecLaneOperand(const StaticInst *si, int idx, 353 const LaneData<LaneSize::EightByte>& val) 354 { 355 return setVecLaneOperandT(si, idx, val); 356 } 357 /** @} */ 358 359 VecElem readVecElemOperand(const StaticInst *si, int idx) const 360 { 361 return this->cpu->readVecElem(this->_srcRegIdx[idx]); 362 } 363 364 CCReg readCCRegOperand(const StaticInst *si, int idx) 365 { 366 return this->cpu->readCCReg(this->_srcRegIdx[idx]); 367 } 368 369 /** @todo: Make results into arrays so they can handle multiple dest 370 * registers. 371 */ 372 void 373 setIntRegOperand(const StaticInst *si, int idx, RegVal val) 374 { 375 this->cpu->setIntReg(this->_destRegIdx[idx], val); 376 BaseDynInst<Impl>::setIntRegOperand(si, idx, val); 377 } 378 379 void 380 setFloatRegOperandBits(const StaticInst *si, int idx, RegVal val) 381 { 382 this->cpu->setFloatRegBits(this->_destRegIdx[idx], val); 383 BaseDynInst<Impl>::setFloatRegOperandBits(si, idx, val); 384 } 385 386 void 387 setVecRegOperand(const StaticInst *si, int idx, 388 const VecRegContainer& val) 389 { 390 this->cpu->setVecReg(this->_destRegIdx[idx], val); 391 BaseDynInst<Impl>::setVecRegOperand(si, idx, val); 392 } 393 394 void setVecElemOperand(const StaticInst *si, int idx, 395 const VecElem val) 396 { 397 int reg_idx = idx; 398 this->cpu->setVecElem(this->_destRegIdx[reg_idx], val); 399 BaseDynInst<Impl>::setVecElemOperand(si, idx, val); 400 } 401 402 void setCCRegOperand(const StaticInst *si, int idx, CCReg val) 403 { 404 this->cpu->setCCReg(this->_destRegIdx[idx], val); 405 BaseDynInst<Impl>::setCCRegOperand(si, idx, val); 406 } 407 408#if THE_ISA == MIPS_ISA 409 RegVal 410 readRegOtherThread(const RegId& misc_reg, ThreadID tid) 411 { 412 panic("MIPS MT not defined for O3 CPU.\n"); 413 return 0; 414 } 415 416 void 417 setRegOtherThread(const RegId& misc_reg, RegVal val, ThreadID tid) 418 { 419 panic("MIPS MT not defined for O3 CPU.\n"); 420 } 421#endif 422}; 423 424#endif // __CPU_O3_ALPHA_DYN_INST_HH__ 425 426