base.cc revision 10529:05b5a6cf3521
1/* 2 * Copyright (c) 2010-2012 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) 2002-2005 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: Steve Reinhardt 42 */ 43 44#include "arch/kernel_stats.hh" 45#include "arch/stacktrace.hh" 46#include "arch/tlb.hh" 47#include "arch/utility.hh" 48#include "arch/vtophys.hh" 49#include "base/loader/symtab.hh" 50#include "base/cp_annotate.hh" 51#include "base/cprintf.hh" 52#include "base/inifile.hh" 53#include "base/misc.hh" 54#include "base/pollevent.hh" 55#include "base/trace.hh" 56#include "base/types.hh" 57#include "config/the_isa.hh" 58#include "cpu/simple/base.hh" 59#include "cpu/base.hh" 60#include "cpu/checker/cpu.hh" 61#include "cpu/checker/thread_context.hh" 62#include "cpu/exetrace.hh" 63#include "cpu/pred/bpred_unit.hh" 64#include "cpu/profile.hh" 65#include "cpu/simple_thread.hh" 66#include "cpu/smt.hh" 67#include "cpu/static_inst.hh" 68#include "cpu/thread_context.hh" 69#include "debug/Decode.hh" 70#include "debug/Fetch.hh" 71#include "debug/Quiesce.hh" 72#include "mem/mem_object.hh" 73#include "mem/packet.hh" 74#include "mem/request.hh" 75#include "params/BaseSimpleCPU.hh" 76#include "sim/byteswap.hh" 77#include "sim/debug.hh" 78#include "sim/faults.hh" 79#include "sim/full_system.hh" 80#include "sim/sim_events.hh" 81#include "sim/sim_object.hh" 82#include "sim/stats.hh" 83#include "sim/system.hh" 84 85using namespace std; 86using namespace TheISA; 87 88BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p) 89 : BaseCPU(p), 90 branchPred(p->branchPred), 91 traceData(NULL), thread(NULL) 92{ 93 if (FullSystem) 94 thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb, 95 p->isa[0]); 96 else 97 thread = new SimpleThread(this, /* thread_num */ 0, p->system, 98 p->workload[0], p->itb, p->dtb, p->isa[0]); 99 100 thread->setStatus(ThreadContext::Halted); 101 102 tc = thread->getTC(); 103 104 if (p->checker) { 105 BaseCPU *temp_checker = p->checker; 106 checker = dynamic_cast<CheckerCPU *>(temp_checker); 107 checker->setSystem(p->system); 108 // Manipulate thread context 109 ThreadContext *cpu_tc = tc; 110 tc = new CheckerThreadContext<ThreadContext>(cpu_tc, this->checker); 111 } else { 112 checker = NULL; 113 } 114 115 numInst = 0; 116 startNumInst = 0; 117 numOp = 0; 118 startNumOp = 0; 119 numLoad = 0; 120 startNumLoad = 0; 121 lastIcacheStall = 0; 122 lastDcacheStall = 0; 123 124 threadContexts.push_back(tc); 125 126 127 fetchOffset = 0; 128 stayAtPC = false; 129} 130 131BaseSimpleCPU::~BaseSimpleCPU() 132{ 133} 134 135void 136BaseSimpleCPU::haltContext(ThreadID thread_num) 137{ 138 // for now, these are equivalent 139 suspendContext(thread_num); 140} 141 142 143void 144BaseSimpleCPU::regStats() 145{ 146 using namespace Stats; 147 148 BaseCPU::regStats(); 149 150 numInsts 151 .name(name() + ".committedInsts") 152 .desc("Number of instructions committed") 153 ; 154 155 numOps 156 .name(name() + ".committedOps") 157 .desc("Number of ops (including micro ops) committed") 158 ; 159 160 numIntAluAccesses 161 .name(name() + ".num_int_alu_accesses") 162 .desc("Number of integer alu accesses") 163 ; 164 165 numFpAluAccesses 166 .name(name() + ".num_fp_alu_accesses") 167 .desc("Number of float alu accesses") 168 ; 169 170 numCallsReturns 171 .name(name() + ".num_func_calls") 172 .desc("number of times a function call or return occured") 173 ; 174 175 numCondCtrlInsts 176 .name(name() + ".num_conditional_control_insts") 177 .desc("number of instructions that are conditional controls") 178 ; 179 180 numIntInsts 181 .name(name() + ".num_int_insts") 182 .desc("number of integer instructions") 183 ; 184 185 numFpInsts 186 .name(name() + ".num_fp_insts") 187 .desc("number of float instructions") 188 ; 189 190 numIntRegReads 191 .name(name() + ".num_int_register_reads") 192 .desc("number of times the integer registers were read") 193 ; 194 195 numIntRegWrites 196 .name(name() + ".num_int_register_writes") 197 .desc("number of times the integer registers were written") 198 ; 199 200 numFpRegReads 201 .name(name() + ".num_fp_register_reads") 202 .desc("number of times the floating registers were read") 203 ; 204 205 numFpRegWrites 206 .name(name() + ".num_fp_register_writes") 207 .desc("number of times the floating registers were written") 208 ; 209 210 numCCRegReads 211 .name(name() + ".num_cc_register_reads") 212 .desc("number of times the CC registers were read") 213 .flags(nozero) 214 ; 215 216 numCCRegWrites 217 .name(name() + ".num_cc_register_writes") 218 .desc("number of times the CC registers were written") 219 .flags(nozero) 220 ; 221 222 numMemRefs 223 .name(name()+".num_mem_refs") 224 .desc("number of memory refs") 225 ; 226 227 numStoreInsts 228 .name(name() + ".num_store_insts") 229 .desc("Number of store instructions") 230 ; 231 232 numLoadInsts 233 .name(name() + ".num_load_insts") 234 .desc("Number of load instructions") 235 ; 236 237 notIdleFraction 238 .name(name() + ".not_idle_fraction") 239 .desc("Percentage of non-idle cycles") 240 ; 241 242 idleFraction 243 .name(name() + ".idle_fraction") 244 .desc("Percentage of idle cycles") 245 ; 246 247 numBusyCycles 248 .name(name() + ".num_busy_cycles") 249 .desc("Number of busy cycles") 250 ; 251 252 numIdleCycles 253 .name(name()+".num_idle_cycles") 254 .desc("Number of idle cycles") 255 ; 256 257 icacheStallCycles 258 .name(name() + ".icache_stall_cycles") 259 .desc("ICache total stall cycles") 260 .prereq(icacheStallCycles) 261 ; 262 263 dcacheStallCycles 264 .name(name() + ".dcache_stall_cycles") 265 .desc("DCache total stall cycles") 266 .prereq(dcacheStallCycles) 267 ; 268 269 icacheRetryCycles 270 .name(name() + ".icache_retry_cycles") 271 .desc("ICache total retry cycles") 272 .prereq(icacheRetryCycles) 273 ; 274 275 dcacheRetryCycles 276 .name(name() + ".dcache_retry_cycles") 277 .desc("DCache total retry cycles") 278 .prereq(dcacheRetryCycles) 279 ; 280 281 statExecutedInstType 282 .init(Enums::Num_OpClass) 283 .name(name() + ".op_class") 284 .desc("Class of executed instruction") 285 .flags(total | pdf | dist) 286 ; 287 for (unsigned i = 0; i < Num_OpClasses; ++i) { 288 statExecutedInstType.subname(i, Enums::OpClassStrings[i]); 289 } 290 291 idleFraction = constant(1.0) - notIdleFraction; 292 numIdleCycles = idleFraction * numCycles; 293 numBusyCycles = (notIdleFraction)*numCycles; 294 295 numBranches 296 .name(name() + ".Branches") 297 .desc("Number of branches fetched") 298 .prereq(numBranches); 299 300 numPredictedBranches 301 .name(name() + ".predictedBranches") 302 .desc("Number of branches predicted as taken") 303 .prereq(numPredictedBranches); 304 305 numBranchMispred 306 .name(name() + ".BranchMispred") 307 .desc("Number of branch mispredictions") 308 .prereq(numBranchMispred); 309} 310 311void 312BaseSimpleCPU::resetStats() 313{ 314// startNumInst = numInst; 315 notIdleFraction = (_status != Idle); 316} 317 318void 319BaseSimpleCPU::serializeThread(ostream &os, ThreadID tid) 320{ 321 assert(_status == Idle || _status == Running); 322 assert(tid == 0); 323 324 thread->serialize(os); 325} 326 327void 328BaseSimpleCPU::unserializeThread(Checkpoint *cp, const string §ion, 329 ThreadID tid) 330{ 331 if (tid != 0) 332 fatal("Trying to load more than one thread into a SimpleCPU\n"); 333 thread->unserialize(cp, section); 334} 335 336void 337change_thread_state(ThreadID tid, int activate, int priority) 338{ 339} 340 341Addr 342BaseSimpleCPU::dbg_vtophys(Addr addr) 343{ 344 return vtophys(tc, addr); 345} 346 347void 348BaseSimpleCPU::wakeup() 349{ 350 getAddrMonitor()->gotWakeup = true; 351 352 if (thread->status() != ThreadContext::Suspended) 353 return; 354 355 DPRINTF(Quiesce,"Suspended Processor awoke\n"); 356 thread->activate(); 357} 358 359void 360BaseSimpleCPU::checkForInterrupts() 361{ 362 if (checkInterrupts(tc)) { 363 Fault interrupt = interrupts->getInterrupt(tc); 364 365 if (interrupt != NoFault) { 366 fetchOffset = 0; 367 interrupts->updateIntrInfo(tc); 368 interrupt->invoke(tc); 369 thread->decoder.reset(); 370 } 371 } 372} 373 374 375void 376BaseSimpleCPU::setupFetchRequest(Request *req) 377{ 378 Addr instAddr = thread->instAddr(); 379 380 // set up memory request for instruction fetch 381 DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr); 382 383 Addr fetchPC = (instAddr & PCMask) + fetchOffset; 384 req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instMasterId(), 385 instAddr); 386} 387 388 389void 390BaseSimpleCPU::preExecute() 391{ 392 // maintain $r0 semantics 393 thread->setIntReg(ZeroReg, 0); 394#if THE_ISA == ALPHA_ISA 395 thread->setFloatReg(ZeroReg, 0.0); 396#endif // ALPHA_ISA 397 398 // check for instruction-count-based events 399 comInstEventQueue[0]->serviceEvents(numInst); 400 system->instEventQueue.serviceEvents(system->totalNumInsts); 401 402 // decode the instruction 403 inst = gtoh(inst); 404 405 TheISA::PCState pcState = thread->pcState(); 406 407 if (isRomMicroPC(pcState.microPC())) { 408 stayAtPC = false; 409 curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(), 410 curMacroStaticInst); 411 } else if (!curMacroStaticInst) { 412 //We're not in the middle of a macro instruction 413 StaticInstPtr instPtr = NULL; 414 415 TheISA::Decoder *decoder = &(thread->decoder); 416 417 //Predecode, ie bundle up an ExtMachInst 418 //If more fetch data is needed, pass it in. 419 Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset; 420 //if(decoder->needMoreBytes()) 421 decoder->moreBytes(pcState, fetchPC, inst); 422 //else 423 // decoder->process(); 424 425 //Decode an instruction if one is ready. Otherwise, we'll have to 426 //fetch beyond the MachInst at the current pc. 427 instPtr = decoder->decode(pcState); 428 if (instPtr) { 429 stayAtPC = false; 430 thread->pcState(pcState); 431 } else { 432 stayAtPC = true; 433 fetchOffset += sizeof(MachInst); 434 } 435 436 //If we decoded an instruction and it's microcoded, start pulling 437 //out micro ops 438 if (instPtr && instPtr->isMacroop()) { 439 curMacroStaticInst = instPtr; 440 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); 441 } else { 442 curStaticInst = instPtr; 443 } 444 } else { 445 //Read the next micro op from the macro op 446 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); 447 } 448 449 //If we decoded an instruction this "tick", record information about it. 450 if (curStaticInst) { 451#if TRACING_ON 452 traceData = tracer->getInstRecord(curTick(), tc, 453 curStaticInst, thread->pcState(), curMacroStaticInst); 454 455 DPRINTF(Decode,"Decode: Decoded %s instruction: %#x\n", 456 curStaticInst->getName(), curStaticInst->machInst); 457#endif // TRACING_ON 458 } 459 460 if (branchPred && curStaticInst && curStaticInst->isControl()) { 461 // Use a fake sequence number since we only have one 462 // instruction in flight at the same time. 463 const InstSeqNum cur_sn(0); 464 const ThreadID tid(0); 465 pred_pc = thread->pcState(); 466 const bool predict_taken( 467 branchPred->predict(curStaticInst, cur_sn, pred_pc, tid)); 468 469 if (predict_taken) 470 ++numPredictedBranches; 471 } 472} 473 474void 475BaseSimpleCPU::postExecute() 476{ 477 assert(curStaticInst); 478 479 TheISA::PCState pc = tc->pcState(); 480 Addr instAddr = pc.instAddr(); 481 if (FullSystem && thread->profile) { 482 bool usermode = TheISA::inUserMode(tc); 483 thread->profilePC = usermode ? 1 : instAddr; 484 ProfileNode *node = thread->profile->consume(tc, curStaticInst); 485 if (node) 486 thread->profileNode = node; 487 } 488 489 if (curStaticInst->isMemRef()) { 490 numMemRefs++; 491 } 492 493 if (curStaticInst->isLoad()) { 494 ++numLoad; 495 comLoadEventQueue[0]->serviceEvents(numLoad); 496 } 497 498 if (CPA::available()) { 499 CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr()); 500 } 501 502 if (curStaticInst->isControl()) { 503 ++numBranches; 504 } 505 506 /* Power model statistics */ 507 //integer alu accesses 508 if (curStaticInst->isInteger()){ 509 numIntAluAccesses++; 510 numIntInsts++; 511 } 512 513 //float alu accesses 514 if (curStaticInst->isFloating()){ 515 numFpAluAccesses++; 516 numFpInsts++; 517 } 518 519 //number of function calls/returns to get window accesses 520 if (curStaticInst->isCall() || curStaticInst->isReturn()){ 521 numCallsReturns++; 522 } 523 524 //the number of branch predictions that will be made 525 if (curStaticInst->isCondCtrl()){ 526 numCondCtrlInsts++; 527 } 528 529 //result bus acceses 530 if (curStaticInst->isLoad()){ 531 numLoadInsts++; 532 } 533 534 if (curStaticInst->isStore()){ 535 numStoreInsts++; 536 } 537 /* End power model statistics */ 538 539 statExecutedInstType[curStaticInst->opClass()]++; 540 541 if (FullSystem) 542 traceFunctions(instAddr); 543 544 if (traceData) { 545 traceData->dump(); 546 delete traceData; 547 traceData = NULL; 548 } 549 550 // Call CPU instruction commit probes 551 probeInstCommit(curStaticInst); 552} 553 554void 555BaseSimpleCPU::advancePC(const Fault &fault) 556{ 557 const bool branching(thread->pcState().branching()); 558 559 //Since we're moving to a new pc, zero out the offset 560 fetchOffset = 0; 561 if (fault != NoFault) { 562 curMacroStaticInst = StaticInst::nullStaticInstPtr; 563 fault->invoke(tc, curStaticInst); 564 thread->decoder.reset(); 565 } else { 566 if (curStaticInst) { 567 if (curStaticInst->isLastMicroop()) 568 curMacroStaticInst = StaticInst::nullStaticInstPtr; 569 TheISA::PCState pcState = thread->pcState(); 570 TheISA::advancePC(pcState, curStaticInst); 571 thread->pcState(pcState); 572 } 573 } 574 575 if (branchPred && curStaticInst && curStaticInst->isControl()) { 576 // Use a fake sequence number since we only have one 577 // instruction in flight at the same time. 578 const InstSeqNum cur_sn(0); 579 const ThreadID tid(0); 580 581 if (pred_pc == thread->pcState()) { 582 // Correctly predicted branch 583 branchPred->update(cur_sn, tid); 584 } else { 585 // Mis-predicted branch 586 branchPred->squash(cur_sn, pcState(), 587 branching, tid); 588 ++numBranchMispred; 589 } 590 } 591} 592 593void 594BaseSimpleCPU::startup() 595{ 596 BaseCPU::startup(); 597 thread->startup(); 598} 599