1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software --- 354 unchanged lines hidden (view full) --- 363 } 364#endif 365} 366 367 368void 369BaseSimpleCPU::setupFetchRequest(Request *req) 370{ |
371 Addr instAddr = thread->instAddr(); |
372 373 // set up memory request for instruction fetch |
374 DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr); |
375 |
376 Addr fetchPC = (instAddr & PCMask) + fetchOffset; 377 req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instAddr); |
378} 379 380 381void 382BaseSimpleCPU::preExecute() 383{ 384 // maintain $r0 semantics 385 thread->setIntReg(ZeroReg, 0); 386#if THE_ISA == ALPHA_ISA 387 thread->setFloatReg(ZeroReg, 0.0); 388#endif // ALPHA_ISA 389 390 // check for instruction-count-based events 391 comInstEventQueue[0]->serviceEvents(numInst); 392 393 // decode the instruction 394 inst = gtoh(inst); 395 |
396 TheISA::PCState pcState = thread->pcState(); |
397 |
398 if (isRomMicroPC(pcState.microPC())) { |
399 stayAtPC = false; |
400 curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(), 401 curMacroStaticInst); |
402 } else if (!curMacroStaticInst) { 403 //We're not in the middle of a macro instruction 404 StaticInstPtr instPtr = NULL; 405 406 //Predecode, ie bundle up an ExtMachInst 407 //This should go away once the constructor can be set up properly 408 predecoder.setTC(thread->getTC()); 409 //If more fetch data is needed, pass it in. |
410 Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset; |
411 //if(predecoder.needMoreBytes()) |
412 predecoder.moreBytes(pcState, fetchPC, inst); |
413 //else 414 // predecoder.process(); 415 416 //If an instruction is ready, decode it. Otherwise, we'll have to 417 //fetch beyond the MachInst at the current pc. 418 if (predecoder.extMachInstReady()) { |
419 stayAtPC = false; |
420 ExtMachInst machInst = predecoder.getExtMachInst(pcState); 421 thread->pcState(pcState); 422 instPtr = StaticInst::decode(machInst, pcState.instAddr()); |
423 } else { 424 stayAtPC = true; 425 fetchOffset += sizeof(MachInst); 426 } 427 428 //If we decoded an instruction and it's microcoded, start pulling 429 //out micro ops 430 if (instPtr && instPtr->isMacroop()) { 431 curMacroStaticInst = instPtr; |
432 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); |
433 } else { 434 curStaticInst = instPtr; 435 } 436 } else { 437 //Read the next micro op from the macro op |
438 curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC()); |
439 } 440 441 //If we decoded an instruction this "tick", record information about it. 442 if(curStaticInst) 443 { 444#if TRACING_ON 445 traceData = tracer->getInstRecord(curTick, tc, |
446 curStaticInst, thread->pcState(), curMacroStaticInst); |
447 448 DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n", 449 curStaticInst->getName(), curStaticInst->machInst); 450#endif // TRACING_ON 451 } 452} 453 454void 455BaseSimpleCPU::postExecute() 456{ |
457 assert(curStaticInst); 458 459 TheISA::PCState pc = tc->pcState(); 460 Addr instAddr = pc.instAddr(); |
461#if FULL_SYSTEM |
462 if (thread->profile) { |
463 bool usermode = TheISA::inUserMode(tc); |
464 thread->profilePC = usermode ? 1 : instAddr; |
465 ProfileNode *node = thread->profile->consume(tc, curStaticInst); 466 if (node) 467 thread->profileNode = node; 468 } 469#endif 470 471 if (curStaticInst->isMemRef()) { 472 numMemRefs++; 473 } 474 475 if (curStaticInst->isLoad()) { 476 ++numLoad; 477 comLoadEventQueue[0]->serviceEvents(numLoad); 478 } 479 480 if (CPA::available()) { |
481 CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr()); |
482 } 483 |
484 traceFunctions(instAddr); |
485 486 if (traceData) { 487 traceData->dump(); 488 delete traceData; 489 traceData = NULL; 490 } 491} 492 493 494void 495BaseSimpleCPU::advancePC(Fault fault) 496{ 497 //Since we're moving to a new pc, zero out the offset 498 fetchOffset = 0; 499 if (fault != NoFault) { 500 curMacroStaticInst = StaticInst::nullStaticInstPtr; 501 fault->invoke(tc, curStaticInst); 502 predecoder.reset(); 503 } else { |
504 if (curStaticInst) { 505 if (curStaticInst->isLastMicroop()) 506 curMacroStaticInst = StaticInst::nullStaticInstPtr; 507 TheISA::PCState pcState = thread->pcState(); 508 TheISA::advancePC(pcState, curStaticInst); 509 thread->pcState(pcState); |
510 } |
511 } 512} 513 514/*Fault 515BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr) 516{ 517 // translate to physical address 518 Fault fault = NoFault; --- 29 unchanged lines hidden --- |