base.cc revision 10193
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::deallocateContext(ThreadID thread_num) 137{ 138 // for now, these are equivalent 139 suspendContext(thread_num); 140} 141 142 143void 144BaseSimpleCPU::haltContext(ThreadID thread_num) 145{ 146 // for now, these are equivalent 147 suspendContext(thread_num); 148} 149 150 151void 152BaseSimpleCPU::regStats() 153{ 154 using namespace Stats; 155 156 BaseCPU::regStats(); 157 158 numInsts 159 .name(name() + ".committedInsts") 160 .desc("Number of instructions committed") 161 ; 162 163 numOps 164 .name(name() + ".committedOps") 165 .desc("Number of ops (including micro ops) committed") 166 ; 167 168 numIntAluAccesses 169 .name(name() + ".num_int_alu_accesses") 170 .desc("Number of integer alu accesses") 171 ; 172 173 numFpAluAccesses 174 .name(name() + ".num_fp_alu_accesses") 175 .desc("Number of float alu accesses") 176 ; 177 178 numCallsReturns 179 .name(name() + ".num_func_calls") 180 .desc("number of times a function call or return occured") 181 ; 182 183 numCondCtrlInsts 184 .name(name() + ".num_conditional_control_insts") 185 .desc("number of instructions that are conditional controls") 186 ; 187 188 numIntInsts 189 .name(name() + ".num_int_insts") 190 .desc("number of integer instructions") 191 ; 192 193 numFpInsts 194 .name(name() + ".num_fp_insts") 195 .desc("number of float instructions") 196 ; 197 198 numIntRegReads 199 .name(name() + ".num_int_register_reads") 200 .desc("number of times the integer registers were read") 201 ; 202 203 numIntRegWrites 204 .name(name() + ".num_int_register_writes") 205 .desc("number of times the integer registers were written") 206 ; 207 208 numFpRegReads 209 .name(name() + ".num_fp_register_reads") 210 .desc("number of times the floating registers were read") 211 ; 212 213 numFpRegWrites 214 .name(name() + ".num_fp_register_writes") 215 .desc("number of times the floating registers were written") 216 ; 217 218 numCCRegReads 219 .name(name() + ".num_cc_register_reads") 220 .desc("number of times the CC registers were read") 221 .flags(nozero) 222 ; 223 224 numCCRegWrites 225 .name(name() + ".num_cc_register_writes") 226 .desc("number of times the CC registers were written") 227 .flags(nozero) 228 ; 229 230 numMemRefs 231 .name(name()+".num_mem_refs") 232 .desc("number of memory refs") 233 ; 234 235 numStoreInsts 236 .name(name() + ".num_store_insts") 237 .desc("Number of store instructions") 238 ; 239 240 numLoadInsts 241 .name(name() + ".num_load_insts") 242 .desc("Number of load instructions") 243 ; 244 245 notIdleFraction 246 .name(name() + ".not_idle_fraction") 247 .desc("Percentage of non-idle cycles") 248 ; 249 250 idleFraction 251 .name(name() + ".idle_fraction") 252 .desc("Percentage of idle cycles") 253 ; 254 255 numBusyCycles 256 .name(name() + ".num_busy_cycles") 257 .desc("Number of busy cycles") 258 ; 259 260 numIdleCycles 261 .name(name()+".num_idle_cycles") 262 .desc("Number of idle cycles") 263 ; 264 265 icacheStallCycles 266 .name(name() + ".icache_stall_cycles") 267 .desc("ICache total stall cycles") 268 .prereq(icacheStallCycles) 269 ; 270 271 dcacheStallCycles 272 .name(name() + ".dcache_stall_cycles") 273 .desc("DCache total stall cycles") 274 .prereq(dcacheStallCycles) 275 ; 276 277 icacheRetryCycles 278 .name(name() + ".icache_retry_cycles") 279 .desc("ICache total retry cycles") 280 .prereq(icacheRetryCycles) 281 ; 282 283 dcacheRetryCycles 284 .name(name() + ".dcache_retry_cycles") 285 .desc("DCache total retry cycles") 286 .prereq(dcacheRetryCycles) 287 ; 288 289 statExecutedInstType 290 .init(Enums::Num_OpClass) 291 .name(name() + ".op_class") 292 .desc("Class of executed instruction") 293 .flags(total | pdf | dist) 294 ; 295 for (unsigned i = 0; i < Num_OpClasses; ++i) { 296 statExecutedInstType.subname(i, Enums::OpClassStrings[i]); 297 } 298 299 idleFraction = constant(1.0) - notIdleFraction; 300 numIdleCycles = idleFraction * numCycles; 301 numBusyCycles = (notIdleFraction)*numCycles; 302 303 numBranches 304 .name(name() + ".Branches") 305 .desc("Number of branches fetched") 306 .prereq(numBranches); 307 308 numPredictedBranches 309 .name(name() + ".predictedBranches") 310 .desc("Number of branches predicted as taken") 311 .prereq(numPredictedBranches); 312 313 numBranchMispred 314 .name(name() + ".BranchMispred") 315 .desc("Number of branch mispredictions") 316 .prereq(numBranchMispred); 317} 318 319void 320BaseSimpleCPU::resetStats() 321{ 322// startNumInst = numInst; 323 notIdleFraction = (_status != Idle); 324} 325 326void 327BaseSimpleCPU::serializeThread(ostream &os, ThreadID tid) 328{ 329 assert(_status == Idle || _status == Running); 330 assert(tid == 0); 331 332 thread->serialize(os); 333} 334 335void 336BaseSimpleCPU::unserializeThread(Checkpoint *cp, const string §ion, 337 ThreadID tid) 338{ 339 if (tid != 0) 340 fatal("Trying to load more than one thread into a SimpleCPU\n"); 341 thread->unserialize(cp, section); 342} 343 344void 345change_thread_state(ThreadID tid, int activate, int priority) 346{ 347} 348 349Addr 350BaseSimpleCPU::dbg_vtophys(Addr addr) 351{ 352 return vtophys(tc, addr); 353} 354 355void 356BaseSimpleCPU::wakeup() 357{ 358 if (thread->status() != ThreadContext::Suspended) 359 return; 360 361 DPRINTF(Quiesce,"Suspended Processor awoke\n"); 362 thread->activate(); 363} 364 365void 366BaseSimpleCPU::checkForInterrupts() 367{ 368 if (checkInterrupts(tc)) { 369 Fault interrupt = interrupts->getInterrupt(tc); 370 371 if (interrupt != NoFault) { 372 fetchOffset = 0; 373 interrupts->updateIntrInfo(tc); 374 interrupt->invoke(tc); 375 thread->decoder.reset(); 376 } 377 } 378} 379 380 381void 382BaseSimpleCPU::setupFetchRequest(Request *req) 383{ 384 Addr instAddr = thread->instAddr(); 385 386 // set up memory request for instruction fetch 387 DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr); 388 389 Addr fetchPC = (instAddr & PCMask) + fetchOffset; 390 req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instMasterId(), 391 instAddr); 392} 393 394 395void 396BaseSimpleCPU::preExecute() 397{ 398 // maintain $r0 semantics 399 thread->setIntReg(ZeroReg, 0); 400#if THE_ISA == ALPHA_ISA 401 thread->setFloatReg(ZeroReg, 0.0); 402#endif // ALPHA_ISA 403 404 // check for instruction-count-based events 405 comInstEventQueue[0]->serviceEvents(numInst); 406 system->instEventQueue.serviceEvents(system->totalNumInsts); 407 408 // decode the instruction 409 inst = gtoh(inst); 410 411 TheISA::PCState pcState = thread->pcState(); 412 413 if (isRomMicroPC(pcState.microPC())) { 414 stayAtPC = false; 415 curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(), 416 curMacroStaticInst); 417 } else if (!curMacroStaticInst) { 418 //We're not in the middle of a macro instruction 419 StaticInstPtr instPtr = NULL; 420 421 TheISA::Decoder *decoder = &(thread->decoder); 422 423 //Predecode, ie bundle up an ExtMachInst 424 //If more fetch data is needed, pass it in. 425 Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset; 426 //if(decoder->needMoreBytes()) 427 decoder->moreBytes(pcState, fetchPC, inst); 428 //else 429 // decoder->process(); 430 431 //Decode an instruction if one is ready. Otherwise, we'll have to 432 //fetch beyond the MachInst at the current pc. 433 instPtr = decoder->decode(pcState); 434 if (instPtr) { 435 stayAtPC = false; 436 thread->pcState(pcState); 437 } else { 438 stayAtPC = true; 439 fetchOffset += sizeof(MachInst); 440 } 441 442 //If we decoded an instruction and it's microcoded, start pulling 443 //out micro ops 444 if (instPtr && instPtr->isMacroop()) { 445 curMacroStaticInst = instPtr; 446 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); 447 } else { 448 curStaticInst = instPtr; 449 } 450 } else { 451 //Read the next micro op from the macro op 452 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); 453 } 454 455 //If we decoded an instruction this "tick", record information about it. 456 if (curStaticInst) { 457#if TRACING_ON 458 traceData = tracer->getInstRecord(curTick(), tc, 459 curStaticInst, thread->pcState(), curMacroStaticInst); 460 461 DPRINTF(Decode,"Decode: Decoded %s instruction: %#x\n", 462 curStaticInst->getName(), curStaticInst->machInst); 463#endif // TRACING_ON 464 } 465 466 if (branchPred && curStaticInst && curStaticInst->isControl()) { 467 // Use a fake sequence number since we only have one 468 // instruction in flight at the same time. 469 const InstSeqNum cur_sn(0); 470 const ThreadID tid(0); 471 pred_pc = thread->pcState(); 472 const bool predict_taken( 473 branchPred->predict(curStaticInst, cur_sn, pred_pc, tid)); 474 475 if (predict_taken) 476 ++numPredictedBranches; 477 } 478} 479 480void 481BaseSimpleCPU::postExecute() 482{ 483 assert(curStaticInst); 484 485 TheISA::PCState pc = tc->pcState(); 486 Addr instAddr = pc.instAddr(); 487 if (FullSystem && thread->profile) { 488 bool usermode = TheISA::inUserMode(tc); 489 thread->profilePC = usermode ? 1 : instAddr; 490 ProfileNode *node = thread->profile->consume(tc, curStaticInst); 491 if (node) 492 thread->profileNode = node; 493 } 494 495 if (curStaticInst->isMemRef()) { 496 numMemRefs++; 497 } 498 499 if (curStaticInst->isLoad()) { 500 ++numLoad; 501 comLoadEventQueue[0]->serviceEvents(numLoad); 502 } 503 504 if (CPA::available()) { 505 CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr()); 506 } 507 508 if (curStaticInst->isControl()) { 509 ++numBranches; 510 } 511 512 /* Power model statistics */ 513 //integer alu accesses 514 if (curStaticInst->isInteger()){ 515 numIntAluAccesses++; 516 numIntInsts++; 517 } 518 519 //float alu accesses 520 if (curStaticInst->isFloating()){ 521 numFpAluAccesses++; 522 numFpInsts++; 523 } 524 525 //number of function calls/returns to get window accesses 526 if (curStaticInst->isCall() || curStaticInst->isReturn()){ 527 numCallsReturns++; 528 } 529 530 //the number of branch predictions that will be made 531 if (curStaticInst->isCondCtrl()){ 532 numCondCtrlInsts++; 533 } 534 535 //result bus acceses 536 if (curStaticInst->isLoad()){ 537 numLoadInsts++; 538 } 539 540 if (curStaticInst->isStore()){ 541 numStoreInsts++; 542 } 543 /* End power model statistics */ 544 545 statExecutedInstType[curStaticInst->opClass()]++; 546 547 if (FullSystem) 548 traceFunctions(instAddr); 549 550 if (traceData) { 551 traceData->dump(); 552 delete traceData; 553 traceData = NULL; 554 } 555} 556 557void 558BaseSimpleCPU::advancePC(Fault fault) 559{ 560 const bool branching(thread->pcState().branching()); 561 562 //Since we're moving to a new pc, zero out the offset 563 fetchOffset = 0; 564 if (fault != NoFault) { 565 curMacroStaticInst = StaticInst::nullStaticInstPtr; 566 fault->invoke(tc, curStaticInst); 567 thread->decoder.reset(); 568 } else { 569 if (curStaticInst) { 570 if (curStaticInst->isLastMicroop()) 571 curMacroStaticInst = StaticInst::nullStaticInstPtr; 572 TheISA::PCState pcState = thread->pcState(); 573 TheISA::advancePC(pcState, curStaticInst); 574 thread->pcState(pcState); 575 } 576 } 577 578 if (branchPred && curStaticInst && curStaticInst->isControl()) { 579 // Use a fake sequence number since we only have one 580 // instruction in flight at the same time. 581 const InstSeqNum cur_sn(0); 582 const ThreadID tid(0); 583 584 if (pred_pc == thread->pcState()) { 585 // Correctly predicted branch 586 branchPred->update(cur_sn, tid); 587 } else { 588 // Mis-predicted branch 589 branchPred->squash(cur_sn, pcState(), 590 branching, tid); 591 ++numBranchMispred; 592 } 593 } 594} 595 596void 597BaseSimpleCPU::startup() 598{ 599 BaseCPU::startup(); 600 thread->startup(); 601} 602