base.cc revision 9983
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/profile.hh" 64#include "cpu/simple_thread.hh" 65#include "cpu/smt.hh" 66#include "cpu/static_inst.hh" 67#include "cpu/thread_context.hh" 68#include "debug/Decode.hh" 69#include "debug/Fetch.hh" 70#include "debug/Quiesce.hh" 71#include "mem/mem_object.hh" 72#include "mem/packet.hh" 73#include "mem/request.hh" 74#include "params/BaseSimpleCPU.hh" 75#include "sim/byteswap.hh" 76#include "sim/debug.hh" 77#include "sim/faults.hh" 78#include "sim/full_system.hh" 79#include "sim/sim_events.hh" 80#include "sim/sim_object.hh" 81#include "sim/stats.hh" 82#include "sim/system.hh" 83 84using namespace std; 85using namespace TheISA; 86 87BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p) 88 : BaseCPU(p), traceData(NULL), thread(NULL) 89{ 90 if (FullSystem) 91 thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb, 92 p->isa[0]); 93 else 94 thread = new SimpleThread(this, /* thread_num */ 0, p->system, 95 p->workload[0], p->itb, p->dtb, p->isa[0]); 96 97 thread->setStatus(ThreadContext::Halted); 98 99 tc = thread->getTC(); 100 101 if (p->checker) { 102 BaseCPU *temp_checker = p->checker; 103 checker = dynamic_cast<CheckerCPU *>(temp_checker); 104 checker->setSystem(p->system); 105 // Manipulate thread context 106 ThreadContext *cpu_tc = tc; 107 tc = new CheckerThreadContext<ThreadContext>(cpu_tc, this->checker); 108 } else { 109 checker = NULL; 110 } 111 112 numInst = 0; 113 startNumInst = 0; 114 numOp = 0; 115 startNumOp = 0; 116 numLoad = 0; 117 startNumLoad = 0; 118 lastIcacheStall = 0; 119 lastDcacheStall = 0; 120 121 threadContexts.push_back(tc); 122 123 124 fetchOffset = 0; 125 stayAtPC = false; 126} 127 128BaseSimpleCPU::~BaseSimpleCPU() 129{ 130} 131 132void 133BaseSimpleCPU::deallocateContext(ThreadID thread_num) 134{ 135 // for now, these are equivalent 136 suspendContext(thread_num); 137} 138 139 140void 141BaseSimpleCPU::haltContext(ThreadID thread_num) 142{ 143 // for now, these are equivalent 144 suspendContext(thread_num); 145} 146 147 148void 149BaseSimpleCPU::regStats() 150{ 151 using namespace Stats; 152 153 BaseCPU::regStats(); 154 155 numInsts 156 .name(name() + ".committedInsts") 157 .desc("Number of instructions committed") 158 ; 159 160 numOps 161 .name(name() + ".committedOps") 162 .desc("Number of ops (including micro ops) committed") 163 ; 164 165 numIntAluAccesses 166 .name(name() + ".num_int_alu_accesses") 167 .desc("Number of integer alu accesses") 168 ; 169 170 numFpAluAccesses 171 .name(name() + ".num_fp_alu_accesses") 172 .desc("Number of float alu accesses") 173 ; 174 175 numCallsReturns 176 .name(name() + ".num_func_calls") 177 .desc("number of times a function call or return occured") 178 ; 179 180 numCondCtrlInsts 181 .name(name() + ".num_conditional_control_insts") 182 .desc("number of instructions that are conditional controls") 183 ; 184 185 numIntInsts 186 .name(name() + ".num_int_insts") 187 .desc("number of integer instructions") 188 ; 189 190 numFpInsts 191 .name(name() + ".num_fp_insts") 192 .desc("number of float instructions") 193 ; 194 195 numIntRegReads 196 .name(name() + ".num_int_register_reads") 197 .desc("number of times the integer registers were read") 198 ; 199 200 numIntRegWrites 201 .name(name() + ".num_int_register_writes") 202 .desc("number of times the integer registers were written") 203 ; 204 205 numFpRegReads 206 .name(name() + ".num_fp_register_reads") 207 .desc("number of times the floating registers were read") 208 ; 209 210 numFpRegWrites 211 .name(name() + ".num_fp_register_writes") 212 .desc("number of times the floating registers were written") 213 ; 214 215 numCCRegReads 216 .name(name() + ".num_cc_register_reads") 217 .desc("number of times the CC registers were read") 218 .flags(nozero) 219 ; 220 221 numCCRegWrites 222 .name(name() + ".num_cc_register_writes") 223 .desc("number of times the CC registers were written") 224 .flags(nozero) 225 ; 226 227 numMemRefs 228 .name(name()+".num_mem_refs") 229 .desc("number of memory refs") 230 ; 231 232 numStoreInsts 233 .name(name() + ".num_store_insts") 234 .desc("Number of store instructions") 235 ; 236 237 numLoadInsts 238 .name(name() + ".num_load_insts") 239 .desc("Number of load instructions") 240 ; 241 242 notIdleFraction 243 .name(name() + ".not_idle_fraction") 244 .desc("Percentage of non-idle cycles") 245 ; 246 247 idleFraction 248 .name(name() + ".idle_fraction") 249 .desc("Percentage of idle cycles") 250 ; 251 252 numBusyCycles 253 .name(name() + ".num_busy_cycles") 254 .desc("Number of busy cycles") 255 ; 256 257 numIdleCycles 258 .name(name()+".num_idle_cycles") 259 .desc("Number of idle cycles") 260 ; 261 262 icacheStallCycles 263 .name(name() + ".icache_stall_cycles") 264 .desc("ICache total stall cycles") 265 .prereq(icacheStallCycles) 266 ; 267 268 dcacheStallCycles 269 .name(name() + ".dcache_stall_cycles") 270 .desc("DCache total stall cycles") 271 .prereq(dcacheStallCycles) 272 ; 273 274 icacheRetryCycles 275 .name(name() + ".icache_retry_cycles") 276 .desc("ICache total retry cycles") 277 .prereq(icacheRetryCycles) 278 ; 279 280 dcacheRetryCycles 281 .name(name() + ".dcache_retry_cycles") 282 .desc("DCache total retry cycles") 283 .prereq(dcacheRetryCycles) 284 ; 285 286 idleFraction = constant(1.0) - notIdleFraction; 287 numIdleCycles = idleFraction * numCycles; 288 numBusyCycles = (notIdleFraction)*numCycles; 289} 290 291void 292BaseSimpleCPU::resetStats() 293{ 294// startNumInst = numInst; 295 notIdleFraction = (_status != Idle); 296} 297 298void 299BaseSimpleCPU::serializeThread(ostream &os, ThreadID tid) 300{ 301 assert(_status == Idle || _status == Running); 302 assert(tid == 0); 303 304 thread->serialize(os); 305} 306 307void 308BaseSimpleCPU::unserializeThread(Checkpoint *cp, const string §ion, 309 ThreadID tid) 310{ 311 if (tid != 0) 312 fatal("Trying to load more than one thread into a SimpleCPU\n"); 313 thread->unserialize(cp, section); 314} 315 316void 317change_thread_state(ThreadID tid, int activate, int priority) 318{ 319} 320 321Addr 322BaseSimpleCPU::dbg_vtophys(Addr addr) 323{ 324 return vtophys(tc, addr); 325} 326 327void 328BaseSimpleCPU::wakeup() 329{ 330 if (thread->status() != ThreadContext::Suspended) 331 return; 332 333 DPRINTF(Quiesce,"Suspended Processor awoke\n"); 334 thread->activate(); 335} 336 337void 338BaseSimpleCPU::checkForInterrupts() 339{ 340 if (checkInterrupts(tc)) { 341 Fault interrupt = interrupts->getInterrupt(tc); 342 343 if (interrupt != NoFault) { 344 fetchOffset = 0; 345 interrupts->updateIntrInfo(tc); 346 interrupt->invoke(tc); 347 thread->decoder.reset(); 348 } 349 } 350} 351 352 353void 354BaseSimpleCPU::setupFetchRequest(Request *req) 355{ 356 Addr instAddr = thread->instAddr(); 357 358 // set up memory request for instruction fetch 359 DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr); 360 361 Addr fetchPC = (instAddr & PCMask) + fetchOffset; 362 req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instMasterId(), 363 instAddr); 364} 365 366 367void 368BaseSimpleCPU::preExecute() 369{ 370 // maintain $r0 semantics 371 thread->setIntReg(ZeroReg, 0); 372#if THE_ISA == ALPHA_ISA 373 thread->setFloatReg(ZeroReg, 0.0); 374#endif // ALPHA_ISA 375 376 // check for instruction-count-based events 377 comInstEventQueue[0]->serviceEvents(numInst); 378 system->instEventQueue.serviceEvents(system->totalNumInsts); 379 380 // decode the instruction 381 inst = gtoh(inst); 382 383 TheISA::PCState pcState = thread->pcState(); 384 385 if (isRomMicroPC(pcState.microPC())) { 386 stayAtPC = false; 387 curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(), 388 curMacroStaticInst); 389 } else if (!curMacroStaticInst) { 390 //We're not in the middle of a macro instruction 391 StaticInstPtr instPtr = NULL; 392 393 TheISA::Decoder *decoder = &(thread->decoder); 394 395 //Predecode, ie bundle up an ExtMachInst 396 //If more fetch data is needed, pass it in. 397 Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset; 398 //if(decoder->needMoreBytes()) 399 decoder->moreBytes(pcState, fetchPC, inst); 400 //else 401 // decoder->process(); 402 403 //Decode an instruction if one is ready. Otherwise, we'll have to 404 //fetch beyond the MachInst at the current pc. 405 instPtr = decoder->decode(pcState); 406 if (instPtr) { 407 stayAtPC = false; 408 thread->pcState(pcState); 409 } else { 410 stayAtPC = true; 411 fetchOffset += sizeof(MachInst); 412 } 413 414 //If we decoded an instruction and it's microcoded, start pulling 415 //out micro ops 416 if (instPtr && instPtr->isMacroop()) { 417 curMacroStaticInst = instPtr; 418 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); 419 } else { 420 curStaticInst = instPtr; 421 } 422 } else { 423 //Read the next micro op from the macro op 424 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); 425 } 426 427 //If we decoded an instruction this "tick", record information about it. 428 if (curStaticInst) { 429#if TRACING_ON 430 traceData = tracer->getInstRecord(curTick(), tc, 431 curStaticInst, thread->pcState(), curMacroStaticInst); 432 433 DPRINTF(Decode,"Decode: Decoded %s instruction: %#x\n", 434 curStaticInst->getName(), curStaticInst->machInst); 435#endif // TRACING_ON 436 } 437} 438 439void 440BaseSimpleCPU::postExecute() 441{ 442 assert(curStaticInst); 443 444 TheISA::PCState pc = tc->pcState(); 445 Addr instAddr = pc.instAddr(); 446 if (FullSystem && thread->profile) { 447 bool usermode = TheISA::inUserMode(tc); 448 thread->profilePC = usermode ? 1 : instAddr; 449 ProfileNode *node = thread->profile->consume(tc, curStaticInst); 450 if (node) 451 thread->profileNode = node; 452 } 453 454 if (curStaticInst->isMemRef()) { 455 numMemRefs++; 456 } 457 458 if (curStaticInst->isLoad()) { 459 ++numLoad; 460 comLoadEventQueue[0]->serviceEvents(numLoad); 461 } 462 463 if (CPA::available()) { 464 CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr()); 465 } 466 467 /* Power model statistics */ 468 //integer alu accesses 469 if (curStaticInst->isInteger()){ 470 numIntAluAccesses++; 471 numIntInsts++; 472 } 473 474 //float alu accesses 475 if (curStaticInst->isFloating()){ 476 numFpAluAccesses++; 477 numFpInsts++; 478 } 479 480 //number of function calls/returns to get window accesses 481 if (curStaticInst->isCall() || curStaticInst->isReturn()){ 482 numCallsReturns++; 483 } 484 485 //the number of branch predictions that will be made 486 if (curStaticInst->isCondCtrl()){ 487 numCondCtrlInsts++; 488 } 489 490 //result bus acceses 491 if (curStaticInst->isLoad()){ 492 numLoadInsts++; 493 } 494 495 if (curStaticInst->isStore()){ 496 numStoreInsts++; 497 } 498 /* End power model statistics */ 499 500 if (FullSystem) 501 traceFunctions(instAddr); 502 503 if (traceData) { 504 traceData->dump(); 505 delete traceData; 506 traceData = NULL; 507 } 508} 509 510 511void 512BaseSimpleCPU::advancePC(Fault fault) 513{ 514 //Since we're moving to a new pc, zero out the offset 515 fetchOffset = 0; 516 if (fault != NoFault) { 517 curMacroStaticInst = StaticInst::nullStaticInstPtr; 518 fault->invoke(tc, curStaticInst); 519 thread->decoder.reset(); 520 } else { 521 if (curStaticInst) { 522 if (curStaticInst->isLastMicroop()) 523 curMacroStaticInst = StaticInst::nullStaticInstPtr; 524 TheISA::PCState pcState = thread->pcState(); 525 TheISA::advancePC(pcState, curStaticInst); 526 thread->pcState(pcState); 527 } 528 } 529} 530 531void 532BaseSimpleCPU::startup() 533{ 534 BaseCPU::startup(); 535 thread->startup(); 536} 537