1/* 2 * Copyright (c) 2010-2012 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 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2004-2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Kevin Lim 41 * Korey Sewell 42 */ 43 44#include "arch/generic/debugfaults.hh" 45#include "arch/locked_mem.hh" 46#include "base/str.hh" 47#include "config/the_isa.hh" 48#include "cpu/checker/cpu.hh" 49#include "cpu/o3/lsq.hh" 50#include "cpu/o3/lsq_unit.hh" 51#include "debug/Activity.hh" 52#include "debug/IEW.hh" 53#include "debug/LSQUnit.hh" 54#include "mem/packet.hh" 55#include "mem/request.hh" 56 57template<class Impl> 58LSQUnit<Impl>::WritebackEvent::WritebackEvent(DynInstPtr &_inst, PacketPtr _pkt, 59 LSQUnit *lsq_ptr) 60 : Event(Default_Pri, AutoDelete), 61 inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) 62{ 63} 64 65template<class Impl> 66void 67LSQUnit<Impl>::WritebackEvent::process() 68{
| 1/* 2 * Copyright (c) 2010-2012 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 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2004-2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Kevin Lim 41 * Korey Sewell 42 */ 43 44#include "arch/generic/debugfaults.hh" 45#include "arch/locked_mem.hh" 46#include "base/str.hh" 47#include "config/the_isa.hh" 48#include "cpu/checker/cpu.hh" 49#include "cpu/o3/lsq.hh" 50#include "cpu/o3/lsq_unit.hh" 51#include "debug/Activity.hh" 52#include "debug/IEW.hh" 53#include "debug/LSQUnit.hh" 54#include "mem/packet.hh" 55#include "mem/request.hh" 56 57template<class Impl> 58LSQUnit<Impl>::WritebackEvent::WritebackEvent(DynInstPtr &_inst, PacketPtr _pkt, 59 LSQUnit *lsq_ptr) 60 : Event(Default_Pri, AutoDelete), 61 inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) 62{ 63} 64 65template<class Impl> 66void 67LSQUnit<Impl>::WritebackEvent::process() 68{
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295} 296 297template<class Impl> 298void 299LSQUnit<Impl>::resizeLQ(unsigned size) 300{ 301 unsigned size_plus_sentinel = size + 1; 302 assert(size_plus_sentinel >= LQEntries); 303 304 if (size_plus_sentinel > LQEntries) { 305 while (size_plus_sentinel > loadQueue.size()) { 306 DynInstPtr dummy; 307 loadQueue.push_back(dummy); 308 LQEntries++; 309 } 310 } else { 311 LQEntries = size_plus_sentinel; 312 } 313 314} 315 316template<class Impl> 317void 318LSQUnit<Impl>::resizeSQ(unsigned size) 319{ 320 unsigned size_plus_sentinel = size + 1; 321 if (size_plus_sentinel > SQEntries) { 322 while (size_plus_sentinel > storeQueue.size()) { 323 SQEntry dummy; 324 storeQueue.push_back(dummy); 325 SQEntries++; 326 } 327 } else { 328 SQEntries = size_plus_sentinel; 329 } 330} 331 332template <class Impl> 333void 334LSQUnit<Impl>::insert(DynInstPtr &inst) 335{ 336 assert(inst->isMemRef()); 337 338 assert(inst->isLoad() || inst->isStore()); 339 340 if (inst->isLoad()) { 341 insertLoad(inst); 342 } else { 343 insertStore(inst); 344 } 345 346 inst->setInLSQ(); 347} 348 349template <class Impl> 350void 351LSQUnit<Impl>::insertLoad(DynInstPtr &load_inst) 352{ 353 assert((loadTail + 1) % LQEntries != loadHead); 354 assert(loads < LQEntries); 355 356 DPRINTF(LSQUnit, "Inserting load PC %s, idx:%i [sn:%lli]\n", 357 load_inst->pcState(), loadTail, load_inst->seqNum); 358 359 load_inst->lqIdx = loadTail; 360 361 if (stores == 0) { 362 load_inst->sqIdx = -1; 363 } else { 364 load_inst->sqIdx = storeTail; 365 } 366 367 loadQueue[loadTail] = load_inst; 368 369 incrLdIdx(loadTail); 370 371 ++loads; 372} 373 374template <class Impl> 375void 376LSQUnit<Impl>::insertStore(DynInstPtr &store_inst) 377{ 378 // Make sure it is not full before inserting an instruction. 379 assert((storeTail + 1) % SQEntries != storeHead); 380 assert(stores < SQEntries); 381 382 DPRINTF(LSQUnit, "Inserting store PC %s, idx:%i [sn:%lli]\n", 383 store_inst->pcState(), storeTail, store_inst->seqNum); 384 385 store_inst->sqIdx = storeTail; 386 store_inst->lqIdx = loadTail; 387 388 storeQueue[storeTail] = SQEntry(store_inst); 389 390 incrStIdx(storeTail); 391 392 ++stores; 393} 394 395template <class Impl> 396typename Impl::DynInstPtr 397LSQUnit<Impl>::getMemDepViolator() 398{ 399 DynInstPtr temp = memDepViolator; 400 401 memDepViolator = NULL; 402 403 return temp; 404} 405 406template <class Impl> 407unsigned 408LSQUnit<Impl>::numFreeEntries() 409{ 410 unsigned free_lq_entries = LQEntries - loads; 411 unsigned free_sq_entries = SQEntries - stores; 412 413 // Both the LQ and SQ entries have an extra dummy entry to differentiate 414 // empty/full conditions. Subtract 1 from the free entries. 415 if (free_lq_entries < free_sq_entries) { 416 return free_lq_entries - 1; 417 } else { 418 return free_sq_entries - 1; 419 } 420} 421 422template <class Impl> 423void 424LSQUnit<Impl>::checkSnoop(PacketPtr pkt) 425{ 426 int load_idx = loadHead; 427 428 if (!cacheBlockMask) { 429 assert(dcachePort); 430 Addr bs = dcachePort->peerBlockSize(); 431 432 // Make sure we actually got a size 433 assert(bs != 0); 434 435 cacheBlockMask = ~(bs - 1); 436 } 437 438 // Unlock the cpu-local monitor when the CPU sees a snoop to a locked 439 // address. The CPU can speculatively execute a LL operation after a pending 440 // SC operation in the pipeline and that can make the cache monitor the CPU 441 // is connected to valid while it really shouldn't be. 442 for (int x = 0; x < cpu->numActiveThreads(); x++) { 443 ThreadContext *tc = cpu->getContext(x); 444 bool no_squash = cpu->thread[x]->noSquashFromTC; 445 cpu->thread[x]->noSquashFromTC = true; 446 TheISA::handleLockedSnoop(tc, pkt, cacheBlockMask); 447 cpu->thread[x]->noSquashFromTC = no_squash; 448 } 449 450 // If this is the only load in the LSQ we don't care 451 if (load_idx == loadTail) 452 return; 453 incrLdIdx(load_idx); 454 455 DPRINTF(LSQUnit, "Got snoop for address %#x\n", pkt->getAddr()); 456 Addr invalidate_addr = pkt->getAddr() & cacheBlockMask; 457 while (load_idx != loadTail) { 458 DynInstPtr ld_inst = loadQueue[load_idx]; 459 460 if (!ld_inst->effAddrValid() || ld_inst->uncacheable()) { 461 incrLdIdx(load_idx); 462 continue; 463 } 464 465 Addr load_addr = ld_inst->physEffAddr & cacheBlockMask; 466 DPRINTF(LSQUnit, "-- inst [sn:%lli] load_addr: %#x to pktAddr:%#x\n", 467 ld_inst->seqNum, load_addr, invalidate_addr); 468 469 if (load_addr == invalidate_addr) { 470 if (ld_inst->possibleLoadViolation()) { 471 DPRINTF(LSQUnit, "Conflicting load at addr %#x [sn:%lli]\n", 472 ld_inst->physEffAddr, pkt->getAddr(), ld_inst->seqNum); 473 474 // Mark the load for re-execution 475 ld_inst->fault = new ReExec; 476 } else { 477 // If a older load checks this and it's true 478 // then we might have missed the snoop 479 // in which case we need to invalidate to be sure 480 ld_inst->hitExternalSnoop(true); 481 } 482 } 483 incrLdIdx(load_idx); 484 } 485 return; 486} 487 488template <class Impl> 489Fault 490LSQUnit<Impl>::checkViolations(int load_idx, DynInstPtr &inst) 491{ 492 Addr inst_eff_addr1 = inst->effAddr >> depCheckShift; 493 Addr inst_eff_addr2 = (inst->effAddr + inst->effSize - 1) >> depCheckShift; 494 495 /** @todo in theory you only need to check an instruction that has executed 496 * however, there isn't a good way in the pipeline at the moment to check 497 * all instructions that will execute before the store writes back. Thus, 498 * like the implementation that came before it, we're overly conservative. 499 */ 500 while (load_idx != loadTail) { 501 DynInstPtr ld_inst = loadQueue[load_idx]; 502 if (!ld_inst->effAddrValid() || ld_inst->uncacheable()) { 503 incrLdIdx(load_idx); 504 continue; 505 } 506 507 Addr ld_eff_addr1 = ld_inst->effAddr >> depCheckShift; 508 Addr ld_eff_addr2 = 509 (ld_inst->effAddr + ld_inst->effSize - 1) >> depCheckShift; 510 511 if (inst_eff_addr2 >= ld_eff_addr1 && inst_eff_addr1 <= ld_eff_addr2) { 512 if (inst->isLoad()) { 513 // If this load is to the same block as an external snoop 514 // invalidate that we've observed then the load needs to be 515 // squashed as it could have newer data 516 if (ld_inst->hitExternalSnoop()) { 517 if (!memDepViolator || 518 ld_inst->seqNum < memDepViolator->seqNum) { 519 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] " 520 "and [sn:%lli] at address %#x\n", 521 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 522 memDepViolator = ld_inst; 523 524 ++lsqMemOrderViolation; 525 526 return new GenericISA::M5PanicFault( 527 "Detected fault with inst [sn:%lli] and " 528 "[sn:%lli] at address %#x\n", 529 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 530 } 531 } 532 533 // Otherwise, mark the load has a possible load violation 534 // and if we see a snoop before it's commited, we need to squash 535 ld_inst->possibleLoadViolation(true); 536 DPRINTF(LSQUnit, "Found possible load violaiton at addr: %#x" 537 " between instructions [sn:%lli] and [sn:%lli]\n", 538 inst_eff_addr1, inst->seqNum, ld_inst->seqNum); 539 } else { 540 // A load/store incorrectly passed this store. 541 // Check if we already have a violator, or if it's newer 542 // squash and refetch. 543 if (memDepViolator && ld_inst->seqNum > memDepViolator->seqNum) 544 break; 545 546 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] and " 547 "[sn:%lli] at address %#x\n", 548 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 549 memDepViolator = ld_inst; 550 551 ++lsqMemOrderViolation; 552 553 return new GenericISA::M5PanicFault("Detected fault with " 554 "inst [sn:%lli] and [sn:%lli] at address %#x\n", 555 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 556 } 557 } 558 559 incrLdIdx(load_idx); 560 } 561 return NoFault; 562} 563 564 565 566 567template <class Impl> 568Fault 569LSQUnit<Impl>::executeLoad(DynInstPtr &inst) 570{ 571 using namespace TheISA; 572 // Execute a specific load. 573 Fault load_fault = NoFault; 574 575 DPRINTF(LSQUnit, "Executing load PC %s, [sn:%lli]\n", 576 inst->pcState(), inst->seqNum); 577 578 assert(!inst->isSquashed()); 579 580 load_fault = inst->initiateAcc(); 581 582 if (inst->isTranslationDelayed() && 583 load_fault == NoFault) 584 return load_fault; 585 586 // If the instruction faulted or predicated false, then we need to send it 587 // along to commit without the instruction completing. 588 if (load_fault != NoFault || inst->readPredicate() == false) { 589 // Send this instruction to commit, also make sure iew stage 590 // realizes there is activity. 591 // Mark it as executed unless it is an uncached load that 592 // needs to hit the head of commit. 593 if (inst->readPredicate() == false) 594 inst->forwardOldRegs(); 595 DPRINTF(LSQUnit, "Load [sn:%lli] not executed from %s\n", 596 inst->seqNum, 597 (load_fault != NoFault ? "fault" : "predication")); 598 if (!(inst->hasRequest() && inst->uncacheable()) || 599 inst->isAtCommit()) { 600 inst->setExecuted(); 601 } 602 iewStage->instToCommit(inst); 603 iewStage->activityThisCycle(); 604 } else if (!loadBlocked()) { 605 assert(inst->effAddrValid()); 606 int load_idx = inst->lqIdx; 607 incrLdIdx(load_idx); 608 609 if (checkLoads) 610 return checkViolations(load_idx, inst); 611 } 612 613 return load_fault; 614} 615 616template <class Impl> 617Fault 618LSQUnit<Impl>::executeStore(DynInstPtr &store_inst) 619{ 620 using namespace TheISA; 621 // Make sure that a store exists. 622 assert(stores != 0); 623 624 int store_idx = store_inst->sqIdx; 625 626 DPRINTF(LSQUnit, "Executing store PC %s [sn:%lli]\n", 627 store_inst->pcState(), store_inst->seqNum); 628 629 assert(!store_inst->isSquashed()); 630 631 // Check the recently completed loads to see if any match this store's 632 // address. If so, then we have a memory ordering violation. 633 int load_idx = store_inst->lqIdx; 634 635 Fault store_fault = store_inst->initiateAcc(); 636 637 if (store_inst->isTranslationDelayed() && 638 store_fault == NoFault) 639 return store_fault; 640 641 if (store_inst->readPredicate() == false) 642 store_inst->forwardOldRegs(); 643 644 if (storeQueue[store_idx].size == 0) { 645 DPRINTF(LSQUnit,"Fault on Store PC %s, [sn:%lli], Size = 0\n", 646 store_inst->pcState(), store_inst->seqNum); 647 648 return store_fault; 649 } else if (store_inst->readPredicate() == false) { 650 DPRINTF(LSQUnit, "Store [sn:%lli] not executed from predication\n", 651 store_inst->seqNum); 652 return store_fault; 653 } 654 655 assert(store_fault == NoFault); 656 657 if (store_inst->isStoreConditional()) { 658 // Store conditionals need to set themselves as able to 659 // writeback if we haven't had a fault by here. 660 storeQueue[store_idx].canWB = true; 661 662 ++storesToWB; 663 } 664 665 return checkViolations(load_idx, store_inst); 666 667} 668 669template <class Impl> 670void 671LSQUnit<Impl>::commitLoad() 672{ 673 assert(loadQueue[loadHead]); 674 675 DPRINTF(LSQUnit, "Committing head load instruction, PC %s\n", 676 loadQueue[loadHead]->pcState()); 677 678 loadQueue[loadHead] = NULL; 679 680 incrLdIdx(loadHead); 681 682 --loads; 683} 684 685template <class Impl> 686void 687LSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) 688{ 689 assert(loads == 0 || loadQueue[loadHead]); 690 691 while (loads != 0 && loadQueue[loadHead]->seqNum <= youngest_inst) { 692 commitLoad(); 693 } 694} 695 696template <class Impl> 697void 698LSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) 699{ 700 assert(stores == 0 || storeQueue[storeHead].inst); 701 702 int store_idx = storeHead; 703 704 while (store_idx != storeTail) { 705 assert(storeQueue[store_idx].inst); 706 // Mark any stores that are now committed and have not yet 707 // been marked as able to write back. 708 if (!storeQueue[store_idx].canWB) { 709 if (storeQueue[store_idx].inst->seqNum > youngest_inst) { 710 break; 711 } 712 DPRINTF(LSQUnit, "Marking store as able to write back, PC " 713 "%s [sn:%lli]\n", 714 storeQueue[store_idx].inst->pcState(), 715 storeQueue[store_idx].inst->seqNum); 716 717 storeQueue[store_idx].canWB = true; 718 719 ++storesToWB; 720 } 721 722 incrStIdx(store_idx); 723 } 724} 725 726template <class Impl> 727void 728LSQUnit<Impl>::writebackPendingStore() 729{ 730 if (hasPendingPkt) { 731 assert(pendingPkt != NULL); 732 733 // If the cache is blocked, this will store the packet for retry. 734 if (sendStore(pendingPkt)) { 735 storePostSend(pendingPkt); 736 } 737 pendingPkt = NULL; 738 hasPendingPkt = false; 739 } 740} 741 742template <class Impl> 743void 744LSQUnit<Impl>::writebackStores() 745{ 746 // First writeback the second packet from any split store that didn't 747 // complete last cycle because there weren't enough cache ports available. 748 if (TheISA::HasUnalignedMemAcc) { 749 writebackPendingStore(); 750 } 751 752 while (storesToWB > 0 && 753 storeWBIdx != storeTail && 754 storeQueue[storeWBIdx].inst && 755 storeQueue[storeWBIdx].canWB && 756 ((!needsTSO) || (!storeInFlight)) && 757 usedPorts < cachePorts) { 758 759 if (isStoreBlocked || lsq->cacheBlocked()) { 760 DPRINTF(LSQUnit, "Unable to write back any more stores, cache" 761 " is blocked!\n"); 762 break; 763 } 764 765 // Store didn't write any data so no need to write it back to 766 // memory. 767 if (storeQueue[storeWBIdx].size == 0) { 768 completeStore(storeWBIdx); 769 770 incrStIdx(storeWBIdx); 771 772 continue; 773 } 774 775 ++usedPorts; 776 777 if (storeQueue[storeWBIdx].inst->isDataPrefetch()) { 778 incrStIdx(storeWBIdx); 779 780 continue; 781 } 782 783 assert(storeQueue[storeWBIdx].req); 784 assert(!storeQueue[storeWBIdx].committed); 785 786 if (TheISA::HasUnalignedMemAcc && storeQueue[storeWBIdx].isSplit) { 787 assert(storeQueue[storeWBIdx].sreqLow); 788 assert(storeQueue[storeWBIdx].sreqHigh); 789 } 790 791 DynInstPtr inst = storeQueue[storeWBIdx].inst; 792 793 Request *req = storeQueue[storeWBIdx].req; 794 RequestPtr sreqLow = storeQueue[storeWBIdx].sreqLow; 795 RequestPtr sreqHigh = storeQueue[storeWBIdx].sreqHigh; 796 797 storeQueue[storeWBIdx].committed = true; 798 799 assert(!inst->memData); 800 inst->memData = new uint8_t[64]; 801 802 memcpy(inst->memData, storeQueue[storeWBIdx].data, req->getSize()); 803 804 MemCmd command = 805 req->isSwap() ? MemCmd::SwapReq : 806 (req->isLLSC() ? MemCmd::StoreCondReq : MemCmd::WriteReq); 807 PacketPtr data_pkt; 808 PacketPtr snd_data_pkt = NULL; 809 810 LSQSenderState *state = new LSQSenderState; 811 state->isLoad = false; 812 state->idx = storeWBIdx; 813 state->inst = inst; 814 815 if (!TheISA::HasUnalignedMemAcc || !storeQueue[storeWBIdx].isSplit) { 816 817 // Build a single data packet if the store isn't split. 818 data_pkt = new Packet(req, command); 819 data_pkt->dataStatic(inst->memData); 820 data_pkt->senderState = state; 821 } else { 822 // Create two packets if the store is split in two. 823 data_pkt = new Packet(sreqLow, command); 824 snd_data_pkt = new Packet(sreqHigh, command); 825 826 data_pkt->dataStatic(inst->memData); 827 snd_data_pkt->dataStatic(inst->memData + sreqLow->getSize()); 828 829 data_pkt->senderState = state; 830 snd_data_pkt->senderState = state; 831 832 state->isSplit = true; 833 state->outstanding = 2; 834 835 // Can delete the main request now. 836 delete req; 837 req = sreqLow; 838 } 839 840 DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%s " 841 "to Addr:%#x, data:%#x [sn:%lli]\n", 842 storeWBIdx, inst->pcState(), 843 req->getPaddr(), (int)*(inst->memData), 844 inst->seqNum); 845 846 // @todo: Remove this SC hack once the memory system handles it. 847 if (inst->isStoreConditional()) { 848 assert(!storeQueue[storeWBIdx].isSplit); 849 // Disable recording the result temporarily. Writing to 850 // misc regs normally updates the result, but this is not 851 // the desired behavior when handling store conditionals. 852 inst->recordResult(false); 853 bool success = TheISA::handleLockedWrite(inst.get(), req); 854 inst->recordResult(true); 855 856 if (!success) { 857 // Instantly complete this store. 858 DPRINTF(LSQUnit, "Store conditional [sn:%lli] failed. " 859 "Instantly completing it.\n", 860 inst->seqNum); 861 WritebackEvent *wb = new WritebackEvent(inst, data_pkt, this); 862 cpu->schedule(wb, curTick() + 1); 863 if (cpu->checker) { 864 // Make sure to set the LLSC data for verification 865 // if checker is loaded 866 inst->reqToVerify->setExtraData(0); 867 inst->completeAcc(data_pkt); 868 } 869 completeStore(storeWBIdx); 870 incrStIdx(storeWBIdx); 871 continue; 872 } 873 } else { 874 // Non-store conditionals do not need a writeback. 875 state->noWB = true; 876 } 877 878 bool split = 879 TheISA::HasUnalignedMemAcc && storeQueue[storeWBIdx].isSplit; 880 881 ThreadContext *thread = cpu->tcBase(lsqID); 882 883 if (req->isMmappedIpr()) { 884 assert(!inst->isStoreConditional()); 885 TheISA::handleIprWrite(thread, data_pkt); 886 delete data_pkt; 887 if (split) { 888 assert(snd_data_pkt->req->isMmappedIpr()); 889 TheISA::handleIprWrite(thread, snd_data_pkt); 890 delete snd_data_pkt; 891 delete sreqLow; 892 delete sreqHigh; 893 } 894 delete state; 895 delete req; 896 completeStore(storeWBIdx); 897 incrStIdx(storeWBIdx); 898 } else if (!sendStore(data_pkt)) { 899 DPRINTF(IEW, "D-Cache became blocked when writing [sn:%lli], will" 900 "retry later\n", 901 inst->seqNum); 902 903 // Need to store the second packet, if split. 904 if (split) { 905 state->pktToSend = true; 906 state->pendingPacket = snd_data_pkt; 907 } 908 } else { 909 910 // If split, try to send the second packet too 911 if (split) { 912 assert(snd_data_pkt); 913 914 // Ensure there are enough ports to use. 915 if (usedPorts < cachePorts) { 916 ++usedPorts; 917 if (sendStore(snd_data_pkt)) { 918 storePostSend(snd_data_pkt); 919 } else { 920 DPRINTF(IEW, "D-Cache became blocked when writing" 921 " [sn:%lli] second packet, will retry later\n", 922 inst->seqNum); 923 } 924 } else { 925 926 // Store the packet for when there's free ports. 927 assert(pendingPkt == NULL); 928 pendingPkt = snd_data_pkt; 929 hasPendingPkt = true; 930 } 931 } else { 932 933 // Not a split store. 934 storePostSend(data_pkt); 935 } 936 } 937 } 938 939 // Not sure this should set it to 0. 940 usedPorts = 0; 941 942 assert(stores >= 0 && storesToWB >= 0); 943} 944 945/*template <class Impl> 946void 947LSQUnit<Impl>::removeMSHR(InstSeqNum seqNum) 948{ 949 list<InstSeqNum>::iterator mshr_it = find(mshrSeqNums.begin(), 950 mshrSeqNums.end(), 951 seqNum); 952 953 if (mshr_it != mshrSeqNums.end()) { 954 mshrSeqNums.erase(mshr_it); 955 DPRINTF(LSQUnit, "Removing MSHR. count = %i\n",mshrSeqNums.size()); 956 } 957}*/ 958 959template <class Impl> 960void 961LSQUnit<Impl>::squash(const InstSeqNum &squashed_num) 962{ 963 DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" 964 "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); 965 966 int load_idx = loadTail; 967 decrLdIdx(load_idx); 968 969 while (loads != 0 && loadQueue[load_idx]->seqNum > squashed_num) { 970 DPRINTF(LSQUnit,"Load Instruction PC %s squashed, " 971 "[sn:%lli]\n", 972 loadQueue[load_idx]->pcState(), 973 loadQueue[load_idx]->seqNum); 974 975 if (isStalled() && load_idx == stallingLoadIdx) { 976 stalled = false; 977 stallingStoreIsn = 0; 978 stallingLoadIdx = 0; 979 } 980 981 // Clear the smart pointer to make sure it is decremented. 982 loadQueue[load_idx]->setSquashed(); 983 loadQueue[load_idx] = NULL; 984 --loads; 985 986 // Inefficient! 987 loadTail = load_idx; 988 989 decrLdIdx(load_idx); 990 ++lsqSquashedLoads; 991 } 992 993 if (isLoadBlocked) { 994 if (squashed_num < blockedLoadSeqNum) { 995 isLoadBlocked = false; 996 loadBlockedHandled = false; 997 blockedLoadSeqNum = 0; 998 } 999 } 1000 1001 if (memDepViolator && squashed_num < memDepViolator->seqNum) { 1002 memDepViolator = NULL; 1003 } 1004 1005 int store_idx = storeTail; 1006 decrStIdx(store_idx); 1007 1008 while (stores != 0 && 1009 storeQueue[store_idx].inst->seqNum > squashed_num) { 1010 // Instructions marked as can WB are already committed. 1011 if (storeQueue[store_idx].canWB) { 1012 break; 1013 } 1014 1015 DPRINTF(LSQUnit,"Store Instruction PC %s squashed, " 1016 "idx:%i [sn:%lli]\n", 1017 storeQueue[store_idx].inst->pcState(), 1018 store_idx, storeQueue[store_idx].inst->seqNum); 1019 1020 // I don't think this can happen. It should have been cleared 1021 // by the stalling load. 1022 if (isStalled() && 1023 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 1024 panic("Is stalled should have been cleared by stalling load!\n"); 1025 stalled = false; 1026 stallingStoreIsn = 0; 1027 } 1028 1029 // Clear the smart pointer to make sure it is decremented. 1030 storeQueue[store_idx].inst->setSquashed(); 1031 storeQueue[store_idx].inst = NULL; 1032 storeQueue[store_idx].canWB = 0; 1033 1034 // Must delete request now that it wasn't handed off to 1035 // memory. This is quite ugly. @todo: Figure out the proper 1036 // place to really handle request deletes. 1037 delete storeQueue[store_idx].req; 1038 if (TheISA::HasUnalignedMemAcc && storeQueue[store_idx].isSplit) { 1039 delete storeQueue[store_idx].sreqLow; 1040 delete storeQueue[store_idx].sreqHigh; 1041 1042 storeQueue[store_idx].sreqLow = NULL; 1043 storeQueue[store_idx].sreqHigh = NULL; 1044 } 1045 1046 storeQueue[store_idx].req = NULL; 1047 --stores; 1048 1049 // Inefficient! 1050 storeTail = store_idx; 1051 1052 decrStIdx(store_idx); 1053 ++lsqSquashedStores; 1054 } 1055} 1056 1057template <class Impl> 1058void 1059LSQUnit<Impl>::storePostSend(PacketPtr pkt) 1060{ 1061 if (isStalled() && 1062 storeQueue[storeWBIdx].inst->seqNum == stallingStoreIsn) { 1063 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1064 "load idx:%i\n", 1065 stallingStoreIsn, stallingLoadIdx); 1066 stalled = false; 1067 stallingStoreIsn = 0; 1068 iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 1069 } 1070 1071 if (!storeQueue[storeWBIdx].inst->isStoreConditional()) { 1072 // The store is basically completed at this time. This 1073 // only works so long as the checker doesn't try to 1074 // verify the value in memory for stores. 1075 storeQueue[storeWBIdx].inst->setCompleted(); 1076 1077 if (cpu->checker) { 1078 cpu->checker->verify(storeQueue[storeWBIdx].inst); 1079 } 1080 } 1081 1082 if (needsTSO) { 1083 storeInFlight = true; 1084 } 1085 1086 incrStIdx(storeWBIdx); 1087} 1088 1089template <class Impl> 1090void 1091LSQUnit<Impl>::writeback(DynInstPtr &inst, PacketPtr pkt) 1092{ 1093 iewStage->wakeCPU(); 1094 1095 // Squashed instructions do not need to complete their access. 1096 if (inst->isSquashed()) { 1097 iewStage->decrWb(inst->seqNum); 1098 assert(!inst->isStore()); 1099 ++lsqIgnoredResponses; 1100 return; 1101 } 1102 1103 if (!inst->isExecuted()) { 1104 inst->setExecuted(); 1105 1106 // Complete access to copy data to proper place. 1107 inst->completeAcc(pkt); 1108 } 1109 1110 // Need to insert instruction into queue to commit 1111 iewStage->instToCommit(inst); 1112 1113 iewStage->activityThisCycle(); 1114 1115 // see if this load changed the PC 1116 iewStage->checkMisprediction(inst); 1117} 1118 1119template <class Impl> 1120void 1121LSQUnit<Impl>::completeStore(int store_idx) 1122{ 1123 assert(storeQueue[store_idx].inst); 1124 storeQueue[store_idx].completed = true; 1125 --storesToWB; 1126 // A bit conservative because a store completion may not free up entries, 1127 // but hopefully avoids two store completions in one cycle from making 1128 // the CPU tick twice. 1129 cpu->wakeCPU(); 1130 cpu->activityThisCycle(); 1131 1132 if (store_idx == storeHead) { 1133 do { 1134 incrStIdx(storeHead); 1135 1136 --stores; 1137 } while (storeQueue[storeHead].completed && 1138 storeHead != storeTail); 1139 1140 iewStage->updateLSQNextCycle = true; 1141 } 1142 1143 DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " 1144 "idx:%i\n", 1145 storeQueue[store_idx].inst->seqNum, store_idx, storeHead); 1146 1147 if (isStalled() && 1148 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 1149 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1150 "load idx:%i\n", 1151 stallingStoreIsn, stallingLoadIdx); 1152 stalled = false; 1153 stallingStoreIsn = 0; 1154 iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 1155 } 1156 1157 storeQueue[store_idx].inst->setCompleted(); 1158 1159 if (needsTSO) { 1160 storeInFlight = false; 1161 } 1162 1163 // Tell the checker we've completed this instruction. Some stores 1164 // may get reported twice to the checker, but the checker can 1165 // handle that case. 1166 if (cpu->checker) { 1167 cpu->checker->verify(storeQueue[store_idx].inst); 1168 } 1169} 1170 1171template <class Impl> 1172bool 1173LSQUnit<Impl>::sendStore(PacketPtr data_pkt) 1174{ 1175 if (!dcachePort->sendTimingReq(data_pkt)) { 1176 // Need to handle becoming blocked on a store. 1177 isStoreBlocked = true; 1178 ++lsqCacheBlocked; 1179 assert(retryPkt == NULL); 1180 retryPkt = data_pkt; 1181 lsq->setRetryTid(lsqID); 1182 return false; 1183 } 1184 return true; 1185} 1186 1187template <class Impl> 1188void 1189LSQUnit<Impl>::recvRetry() 1190{ 1191 if (isStoreBlocked) { 1192 DPRINTF(LSQUnit, "Receiving retry: store blocked\n"); 1193 assert(retryPkt != NULL); 1194 1195 LSQSenderState *state = 1196 dynamic_cast<LSQSenderState *>(retryPkt->senderState); 1197 1198 if (dcachePort->sendTimingReq(retryPkt)) { 1199 // Don't finish the store unless this is the last packet. 1200 if (!TheISA::HasUnalignedMemAcc || !state->pktToSend || 1201 state->pendingPacket == retryPkt) { 1202 state->pktToSend = false; 1203 storePostSend(retryPkt); 1204 } 1205 retryPkt = NULL; 1206 isStoreBlocked = false; 1207 lsq->setRetryTid(InvalidThreadID); 1208 1209 // Send any outstanding packet. 1210 if (TheISA::HasUnalignedMemAcc && state->pktToSend) { 1211 assert(state->pendingPacket); 1212 if (sendStore(state->pendingPacket)) { 1213 storePostSend(state->pendingPacket); 1214 } 1215 } 1216 } else { 1217 // Still blocked! 1218 ++lsqCacheBlocked; 1219 lsq->setRetryTid(lsqID); 1220 } 1221 } else if (isLoadBlocked) { 1222 DPRINTF(LSQUnit, "Loads squash themselves and all younger insts, " 1223 "no need to resend packet.\n"); 1224 } else { 1225 DPRINTF(LSQUnit, "Retry received but LSQ is no longer blocked.\n"); 1226 } 1227} 1228 1229template <class Impl> 1230inline void 1231LSQUnit<Impl>::incrStIdx(int &store_idx) const 1232{ 1233 if (++store_idx >= SQEntries) 1234 store_idx = 0; 1235} 1236 1237template <class Impl> 1238inline void 1239LSQUnit<Impl>::decrStIdx(int &store_idx) const 1240{ 1241 if (--store_idx < 0) 1242 store_idx += SQEntries; 1243} 1244 1245template <class Impl> 1246inline void 1247LSQUnit<Impl>::incrLdIdx(int &load_idx) const 1248{ 1249 if (++load_idx >= LQEntries) 1250 load_idx = 0; 1251} 1252 1253template <class Impl> 1254inline void 1255LSQUnit<Impl>::decrLdIdx(int &load_idx) const 1256{ 1257 if (--load_idx < 0) 1258 load_idx += LQEntries; 1259} 1260 1261template <class Impl> 1262void 1263LSQUnit<Impl>::dumpInsts() const 1264{ 1265 cprintf("Load store queue: Dumping instructions.\n"); 1266 cprintf("Load queue size: %i\n", loads); 1267 cprintf("Load queue: "); 1268 1269 int load_idx = loadHead; 1270 1271 while (load_idx != loadTail && loadQueue[load_idx]) { 1272 const DynInstPtr &inst(loadQueue[load_idx]); 1273 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum); 1274 1275 incrLdIdx(load_idx); 1276 } 1277 cprintf("\n"); 1278 1279 cprintf("Store queue size: %i\n", stores); 1280 cprintf("Store queue: "); 1281 1282 int store_idx = storeHead; 1283 1284 while (store_idx != storeTail && storeQueue[store_idx].inst) { 1285 const DynInstPtr &inst(storeQueue[store_idx].inst); 1286 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum); 1287 1288 incrStIdx(store_idx); 1289 } 1290 1291 cprintf("\n"); 1292}
| 288} 289 290template<class Impl> 291void 292LSQUnit<Impl>::resizeLQ(unsigned size) 293{ 294 unsigned size_plus_sentinel = size + 1; 295 assert(size_plus_sentinel >= LQEntries); 296 297 if (size_plus_sentinel > LQEntries) { 298 while (size_plus_sentinel > loadQueue.size()) { 299 DynInstPtr dummy; 300 loadQueue.push_back(dummy); 301 LQEntries++; 302 } 303 } else { 304 LQEntries = size_plus_sentinel; 305 } 306 307} 308 309template<class Impl> 310void 311LSQUnit<Impl>::resizeSQ(unsigned size) 312{ 313 unsigned size_plus_sentinel = size + 1; 314 if (size_plus_sentinel > SQEntries) { 315 while (size_plus_sentinel > storeQueue.size()) { 316 SQEntry dummy; 317 storeQueue.push_back(dummy); 318 SQEntries++; 319 } 320 } else { 321 SQEntries = size_plus_sentinel; 322 } 323} 324 325template <class Impl> 326void 327LSQUnit<Impl>::insert(DynInstPtr &inst) 328{ 329 assert(inst->isMemRef()); 330 331 assert(inst->isLoad() || inst->isStore()); 332 333 if (inst->isLoad()) { 334 insertLoad(inst); 335 } else { 336 insertStore(inst); 337 } 338 339 inst->setInLSQ(); 340} 341 342template <class Impl> 343void 344LSQUnit<Impl>::insertLoad(DynInstPtr &load_inst) 345{ 346 assert((loadTail + 1) % LQEntries != loadHead); 347 assert(loads < LQEntries); 348 349 DPRINTF(LSQUnit, "Inserting load PC %s, idx:%i [sn:%lli]\n", 350 load_inst->pcState(), loadTail, load_inst->seqNum); 351 352 load_inst->lqIdx = loadTail; 353 354 if (stores == 0) { 355 load_inst->sqIdx = -1; 356 } else { 357 load_inst->sqIdx = storeTail; 358 } 359 360 loadQueue[loadTail] = load_inst; 361 362 incrLdIdx(loadTail); 363 364 ++loads; 365} 366 367template <class Impl> 368void 369LSQUnit<Impl>::insertStore(DynInstPtr &store_inst) 370{ 371 // Make sure it is not full before inserting an instruction. 372 assert((storeTail + 1) % SQEntries != storeHead); 373 assert(stores < SQEntries); 374 375 DPRINTF(LSQUnit, "Inserting store PC %s, idx:%i [sn:%lli]\n", 376 store_inst->pcState(), storeTail, store_inst->seqNum); 377 378 store_inst->sqIdx = storeTail; 379 store_inst->lqIdx = loadTail; 380 381 storeQueue[storeTail] = SQEntry(store_inst); 382 383 incrStIdx(storeTail); 384 385 ++stores; 386} 387 388template <class Impl> 389typename Impl::DynInstPtr 390LSQUnit<Impl>::getMemDepViolator() 391{ 392 DynInstPtr temp = memDepViolator; 393 394 memDepViolator = NULL; 395 396 return temp; 397} 398 399template <class Impl> 400unsigned 401LSQUnit<Impl>::numFreeEntries() 402{ 403 unsigned free_lq_entries = LQEntries - loads; 404 unsigned free_sq_entries = SQEntries - stores; 405 406 // Both the LQ and SQ entries have an extra dummy entry to differentiate 407 // empty/full conditions. Subtract 1 from the free entries. 408 if (free_lq_entries < free_sq_entries) { 409 return free_lq_entries - 1; 410 } else { 411 return free_sq_entries - 1; 412 } 413} 414 415template <class Impl> 416void 417LSQUnit<Impl>::checkSnoop(PacketPtr pkt) 418{ 419 int load_idx = loadHead; 420 421 if (!cacheBlockMask) { 422 assert(dcachePort); 423 Addr bs = dcachePort->peerBlockSize(); 424 425 // Make sure we actually got a size 426 assert(bs != 0); 427 428 cacheBlockMask = ~(bs - 1); 429 } 430 431 // Unlock the cpu-local monitor when the CPU sees a snoop to a locked 432 // address. The CPU can speculatively execute a LL operation after a pending 433 // SC operation in the pipeline and that can make the cache monitor the CPU 434 // is connected to valid while it really shouldn't be. 435 for (int x = 0; x < cpu->numActiveThreads(); x++) { 436 ThreadContext *tc = cpu->getContext(x); 437 bool no_squash = cpu->thread[x]->noSquashFromTC; 438 cpu->thread[x]->noSquashFromTC = true; 439 TheISA::handleLockedSnoop(tc, pkt, cacheBlockMask); 440 cpu->thread[x]->noSquashFromTC = no_squash; 441 } 442 443 // If this is the only load in the LSQ we don't care 444 if (load_idx == loadTail) 445 return; 446 incrLdIdx(load_idx); 447 448 DPRINTF(LSQUnit, "Got snoop for address %#x\n", pkt->getAddr()); 449 Addr invalidate_addr = pkt->getAddr() & cacheBlockMask; 450 while (load_idx != loadTail) { 451 DynInstPtr ld_inst = loadQueue[load_idx]; 452 453 if (!ld_inst->effAddrValid() || ld_inst->uncacheable()) { 454 incrLdIdx(load_idx); 455 continue; 456 } 457 458 Addr load_addr = ld_inst->physEffAddr & cacheBlockMask; 459 DPRINTF(LSQUnit, "-- inst [sn:%lli] load_addr: %#x to pktAddr:%#x\n", 460 ld_inst->seqNum, load_addr, invalidate_addr); 461 462 if (load_addr == invalidate_addr) { 463 if (ld_inst->possibleLoadViolation()) { 464 DPRINTF(LSQUnit, "Conflicting load at addr %#x [sn:%lli]\n", 465 ld_inst->physEffAddr, pkt->getAddr(), ld_inst->seqNum); 466 467 // Mark the load for re-execution 468 ld_inst->fault = new ReExec; 469 } else { 470 // If a older load checks this and it's true 471 // then we might have missed the snoop 472 // in which case we need to invalidate to be sure 473 ld_inst->hitExternalSnoop(true); 474 } 475 } 476 incrLdIdx(load_idx); 477 } 478 return; 479} 480 481template <class Impl> 482Fault 483LSQUnit<Impl>::checkViolations(int load_idx, DynInstPtr &inst) 484{ 485 Addr inst_eff_addr1 = inst->effAddr >> depCheckShift; 486 Addr inst_eff_addr2 = (inst->effAddr + inst->effSize - 1) >> depCheckShift; 487 488 /** @todo in theory you only need to check an instruction that has executed 489 * however, there isn't a good way in the pipeline at the moment to check 490 * all instructions that will execute before the store writes back. Thus, 491 * like the implementation that came before it, we're overly conservative. 492 */ 493 while (load_idx != loadTail) { 494 DynInstPtr ld_inst = loadQueue[load_idx]; 495 if (!ld_inst->effAddrValid() || ld_inst->uncacheable()) { 496 incrLdIdx(load_idx); 497 continue; 498 } 499 500 Addr ld_eff_addr1 = ld_inst->effAddr >> depCheckShift; 501 Addr ld_eff_addr2 = 502 (ld_inst->effAddr + ld_inst->effSize - 1) >> depCheckShift; 503 504 if (inst_eff_addr2 >= ld_eff_addr1 && inst_eff_addr1 <= ld_eff_addr2) { 505 if (inst->isLoad()) { 506 // If this load is to the same block as an external snoop 507 // invalidate that we've observed then the load needs to be 508 // squashed as it could have newer data 509 if (ld_inst->hitExternalSnoop()) { 510 if (!memDepViolator || 511 ld_inst->seqNum < memDepViolator->seqNum) { 512 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] " 513 "and [sn:%lli] at address %#x\n", 514 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 515 memDepViolator = ld_inst; 516 517 ++lsqMemOrderViolation; 518 519 return new GenericISA::M5PanicFault( 520 "Detected fault with inst [sn:%lli] and " 521 "[sn:%lli] at address %#x\n", 522 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 523 } 524 } 525 526 // Otherwise, mark the load has a possible load violation 527 // and if we see a snoop before it's commited, we need to squash 528 ld_inst->possibleLoadViolation(true); 529 DPRINTF(LSQUnit, "Found possible load violaiton at addr: %#x" 530 " between instructions [sn:%lli] and [sn:%lli]\n", 531 inst_eff_addr1, inst->seqNum, ld_inst->seqNum); 532 } else { 533 // A load/store incorrectly passed this store. 534 // Check if we already have a violator, or if it's newer 535 // squash and refetch. 536 if (memDepViolator && ld_inst->seqNum > memDepViolator->seqNum) 537 break; 538 539 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] and " 540 "[sn:%lli] at address %#x\n", 541 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 542 memDepViolator = ld_inst; 543 544 ++lsqMemOrderViolation; 545 546 return new GenericISA::M5PanicFault("Detected fault with " 547 "inst [sn:%lli] and [sn:%lli] at address %#x\n", 548 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 549 } 550 } 551 552 incrLdIdx(load_idx); 553 } 554 return NoFault; 555} 556 557 558 559 560template <class Impl> 561Fault 562LSQUnit<Impl>::executeLoad(DynInstPtr &inst) 563{ 564 using namespace TheISA; 565 // Execute a specific load. 566 Fault load_fault = NoFault; 567 568 DPRINTF(LSQUnit, "Executing load PC %s, [sn:%lli]\n", 569 inst->pcState(), inst->seqNum); 570 571 assert(!inst->isSquashed()); 572 573 load_fault = inst->initiateAcc(); 574 575 if (inst->isTranslationDelayed() && 576 load_fault == NoFault) 577 return load_fault; 578 579 // If the instruction faulted or predicated false, then we need to send it 580 // along to commit without the instruction completing. 581 if (load_fault != NoFault || inst->readPredicate() == false) { 582 // Send this instruction to commit, also make sure iew stage 583 // realizes there is activity. 584 // Mark it as executed unless it is an uncached load that 585 // needs to hit the head of commit. 586 if (inst->readPredicate() == false) 587 inst->forwardOldRegs(); 588 DPRINTF(LSQUnit, "Load [sn:%lli] not executed from %s\n", 589 inst->seqNum, 590 (load_fault != NoFault ? "fault" : "predication")); 591 if (!(inst->hasRequest() && inst->uncacheable()) || 592 inst->isAtCommit()) { 593 inst->setExecuted(); 594 } 595 iewStage->instToCommit(inst); 596 iewStage->activityThisCycle(); 597 } else if (!loadBlocked()) { 598 assert(inst->effAddrValid()); 599 int load_idx = inst->lqIdx; 600 incrLdIdx(load_idx); 601 602 if (checkLoads) 603 return checkViolations(load_idx, inst); 604 } 605 606 return load_fault; 607} 608 609template <class Impl> 610Fault 611LSQUnit<Impl>::executeStore(DynInstPtr &store_inst) 612{ 613 using namespace TheISA; 614 // Make sure that a store exists. 615 assert(stores != 0); 616 617 int store_idx = store_inst->sqIdx; 618 619 DPRINTF(LSQUnit, "Executing store PC %s [sn:%lli]\n", 620 store_inst->pcState(), store_inst->seqNum); 621 622 assert(!store_inst->isSquashed()); 623 624 // Check the recently completed loads to see if any match this store's 625 // address. If so, then we have a memory ordering violation. 626 int load_idx = store_inst->lqIdx; 627 628 Fault store_fault = store_inst->initiateAcc(); 629 630 if (store_inst->isTranslationDelayed() && 631 store_fault == NoFault) 632 return store_fault; 633 634 if (store_inst->readPredicate() == false) 635 store_inst->forwardOldRegs(); 636 637 if (storeQueue[store_idx].size == 0) { 638 DPRINTF(LSQUnit,"Fault on Store PC %s, [sn:%lli], Size = 0\n", 639 store_inst->pcState(), store_inst->seqNum); 640 641 return store_fault; 642 } else if (store_inst->readPredicate() == false) { 643 DPRINTF(LSQUnit, "Store [sn:%lli] not executed from predication\n", 644 store_inst->seqNum); 645 return store_fault; 646 } 647 648 assert(store_fault == NoFault); 649 650 if (store_inst->isStoreConditional()) { 651 // Store conditionals need to set themselves as able to 652 // writeback if we haven't had a fault by here. 653 storeQueue[store_idx].canWB = true; 654 655 ++storesToWB; 656 } 657 658 return checkViolations(load_idx, store_inst); 659 660} 661 662template <class Impl> 663void 664LSQUnit<Impl>::commitLoad() 665{ 666 assert(loadQueue[loadHead]); 667 668 DPRINTF(LSQUnit, "Committing head load instruction, PC %s\n", 669 loadQueue[loadHead]->pcState()); 670 671 loadQueue[loadHead] = NULL; 672 673 incrLdIdx(loadHead); 674 675 --loads; 676} 677 678template <class Impl> 679void 680LSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) 681{ 682 assert(loads == 0 || loadQueue[loadHead]); 683 684 while (loads != 0 && loadQueue[loadHead]->seqNum <= youngest_inst) { 685 commitLoad(); 686 } 687} 688 689template <class Impl> 690void 691LSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) 692{ 693 assert(stores == 0 || storeQueue[storeHead].inst); 694 695 int store_idx = storeHead; 696 697 while (store_idx != storeTail) { 698 assert(storeQueue[store_idx].inst); 699 // Mark any stores that are now committed and have not yet 700 // been marked as able to write back. 701 if (!storeQueue[store_idx].canWB) { 702 if (storeQueue[store_idx].inst->seqNum > youngest_inst) { 703 break; 704 } 705 DPRINTF(LSQUnit, "Marking store as able to write back, PC " 706 "%s [sn:%lli]\n", 707 storeQueue[store_idx].inst->pcState(), 708 storeQueue[store_idx].inst->seqNum); 709 710 storeQueue[store_idx].canWB = true; 711 712 ++storesToWB; 713 } 714 715 incrStIdx(store_idx); 716 } 717} 718 719template <class Impl> 720void 721LSQUnit<Impl>::writebackPendingStore() 722{ 723 if (hasPendingPkt) { 724 assert(pendingPkt != NULL); 725 726 // If the cache is blocked, this will store the packet for retry. 727 if (sendStore(pendingPkt)) { 728 storePostSend(pendingPkt); 729 } 730 pendingPkt = NULL; 731 hasPendingPkt = false; 732 } 733} 734 735template <class Impl> 736void 737LSQUnit<Impl>::writebackStores() 738{ 739 // First writeback the second packet from any split store that didn't 740 // complete last cycle because there weren't enough cache ports available. 741 if (TheISA::HasUnalignedMemAcc) { 742 writebackPendingStore(); 743 } 744 745 while (storesToWB > 0 && 746 storeWBIdx != storeTail && 747 storeQueue[storeWBIdx].inst && 748 storeQueue[storeWBIdx].canWB && 749 ((!needsTSO) || (!storeInFlight)) && 750 usedPorts < cachePorts) { 751 752 if (isStoreBlocked || lsq->cacheBlocked()) { 753 DPRINTF(LSQUnit, "Unable to write back any more stores, cache" 754 " is blocked!\n"); 755 break; 756 } 757 758 // Store didn't write any data so no need to write it back to 759 // memory. 760 if (storeQueue[storeWBIdx].size == 0) { 761 completeStore(storeWBIdx); 762 763 incrStIdx(storeWBIdx); 764 765 continue; 766 } 767 768 ++usedPorts; 769 770 if (storeQueue[storeWBIdx].inst->isDataPrefetch()) { 771 incrStIdx(storeWBIdx); 772 773 continue; 774 } 775 776 assert(storeQueue[storeWBIdx].req); 777 assert(!storeQueue[storeWBIdx].committed); 778 779 if (TheISA::HasUnalignedMemAcc && storeQueue[storeWBIdx].isSplit) { 780 assert(storeQueue[storeWBIdx].sreqLow); 781 assert(storeQueue[storeWBIdx].sreqHigh); 782 } 783 784 DynInstPtr inst = storeQueue[storeWBIdx].inst; 785 786 Request *req = storeQueue[storeWBIdx].req; 787 RequestPtr sreqLow = storeQueue[storeWBIdx].sreqLow; 788 RequestPtr sreqHigh = storeQueue[storeWBIdx].sreqHigh; 789 790 storeQueue[storeWBIdx].committed = true; 791 792 assert(!inst->memData); 793 inst->memData = new uint8_t[64]; 794 795 memcpy(inst->memData, storeQueue[storeWBIdx].data, req->getSize()); 796 797 MemCmd command = 798 req->isSwap() ? MemCmd::SwapReq : 799 (req->isLLSC() ? MemCmd::StoreCondReq : MemCmd::WriteReq); 800 PacketPtr data_pkt; 801 PacketPtr snd_data_pkt = NULL; 802 803 LSQSenderState *state = new LSQSenderState; 804 state->isLoad = false; 805 state->idx = storeWBIdx; 806 state->inst = inst; 807 808 if (!TheISA::HasUnalignedMemAcc || !storeQueue[storeWBIdx].isSplit) { 809 810 // Build a single data packet if the store isn't split. 811 data_pkt = new Packet(req, command); 812 data_pkt->dataStatic(inst->memData); 813 data_pkt->senderState = state; 814 } else { 815 // Create two packets if the store is split in two. 816 data_pkt = new Packet(sreqLow, command); 817 snd_data_pkt = new Packet(sreqHigh, command); 818 819 data_pkt->dataStatic(inst->memData); 820 snd_data_pkt->dataStatic(inst->memData + sreqLow->getSize()); 821 822 data_pkt->senderState = state; 823 snd_data_pkt->senderState = state; 824 825 state->isSplit = true; 826 state->outstanding = 2; 827 828 // Can delete the main request now. 829 delete req; 830 req = sreqLow; 831 } 832 833 DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%s " 834 "to Addr:%#x, data:%#x [sn:%lli]\n", 835 storeWBIdx, inst->pcState(), 836 req->getPaddr(), (int)*(inst->memData), 837 inst->seqNum); 838 839 // @todo: Remove this SC hack once the memory system handles it. 840 if (inst->isStoreConditional()) { 841 assert(!storeQueue[storeWBIdx].isSplit); 842 // Disable recording the result temporarily. Writing to 843 // misc regs normally updates the result, but this is not 844 // the desired behavior when handling store conditionals. 845 inst->recordResult(false); 846 bool success = TheISA::handleLockedWrite(inst.get(), req); 847 inst->recordResult(true); 848 849 if (!success) { 850 // Instantly complete this store. 851 DPRINTF(LSQUnit, "Store conditional [sn:%lli] failed. " 852 "Instantly completing it.\n", 853 inst->seqNum); 854 WritebackEvent *wb = new WritebackEvent(inst, data_pkt, this); 855 cpu->schedule(wb, curTick() + 1); 856 if (cpu->checker) { 857 // Make sure to set the LLSC data for verification 858 // if checker is loaded 859 inst->reqToVerify->setExtraData(0); 860 inst->completeAcc(data_pkt); 861 } 862 completeStore(storeWBIdx); 863 incrStIdx(storeWBIdx); 864 continue; 865 } 866 } else { 867 // Non-store conditionals do not need a writeback. 868 state->noWB = true; 869 } 870 871 bool split = 872 TheISA::HasUnalignedMemAcc && storeQueue[storeWBIdx].isSplit; 873 874 ThreadContext *thread = cpu->tcBase(lsqID); 875 876 if (req->isMmappedIpr()) { 877 assert(!inst->isStoreConditional()); 878 TheISA::handleIprWrite(thread, data_pkt); 879 delete data_pkt; 880 if (split) { 881 assert(snd_data_pkt->req->isMmappedIpr()); 882 TheISA::handleIprWrite(thread, snd_data_pkt); 883 delete snd_data_pkt; 884 delete sreqLow; 885 delete sreqHigh; 886 } 887 delete state; 888 delete req; 889 completeStore(storeWBIdx); 890 incrStIdx(storeWBIdx); 891 } else if (!sendStore(data_pkt)) { 892 DPRINTF(IEW, "D-Cache became blocked when writing [sn:%lli], will" 893 "retry later\n", 894 inst->seqNum); 895 896 // Need to store the second packet, if split. 897 if (split) { 898 state->pktToSend = true; 899 state->pendingPacket = snd_data_pkt; 900 } 901 } else { 902 903 // If split, try to send the second packet too 904 if (split) { 905 assert(snd_data_pkt); 906 907 // Ensure there are enough ports to use. 908 if (usedPorts < cachePorts) { 909 ++usedPorts; 910 if (sendStore(snd_data_pkt)) { 911 storePostSend(snd_data_pkt); 912 } else { 913 DPRINTF(IEW, "D-Cache became blocked when writing" 914 " [sn:%lli] second packet, will retry later\n", 915 inst->seqNum); 916 } 917 } else { 918 919 // Store the packet for when there's free ports. 920 assert(pendingPkt == NULL); 921 pendingPkt = snd_data_pkt; 922 hasPendingPkt = true; 923 } 924 } else { 925 926 // Not a split store. 927 storePostSend(data_pkt); 928 } 929 } 930 } 931 932 // Not sure this should set it to 0. 933 usedPorts = 0; 934 935 assert(stores >= 0 && storesToWB >= 0); 936} 937 938/*template <class Impl> 939void 940LSQUnit<Impl>::removeMSHR(InstSeqNum seqNum) 941{ 942 list<InstSeqNum>::iterator mshr_it = find(mshrSeqNums.begin(), 943 mshrSeqNums.end(), 944 seqNum); 945 946 if (mshr_it != mshrSeqNums.end()) { 947 mshrSeqNums.erase(mshr_it); 948 DPRINTF(LSQUnit, "Removing MSHR. count = %i\n",mshrSeqNums.size()); 949 } 950}*/ 951 952template <class Impl> 953void 954LSQUnit<Impl>::squash(const InstSeqNum &squashed_num) 955{ 956 DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" 957 "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); 958 959 int load_idx = loadTail; 960 decrLdIdx(load_idx); 961 962 while (loads != 0 && loadQueue[load_idx]->seqNum > squashed_num) { 963 DPRINTF(LSQUnit,"Load Instruction PC %s squashed, " 964 "[sn:%lli]\n", 965 loadQueue[load_idx]->pcState(), 966 loadQueue[load_idx]->seqNum); 967 968 if (isStalled() && load_idx == stallingLoadIdx) { 969 stalled = false; 970 stallingStoreIsn = 0; 971 stallingLoadIdx = 0; 972 } 973 974 // Clear the smart pointer to make sure it is decremented. 975 loadQueue[load_idx]->setSquashed(); 976 loadQueue[load_idx] = NULL; 977 --loads; 978 979 // Inefficient! 980 loadTail = load_idx; 981 982 decrLdIdx(load_idx); 983 ++lsqSquashedLoads; 984 } 985 986 if (isLoadBlocked) { 987 if (squashed_num < blockedLoadSeqNum) { 988 isLoadBlocked = false; 989 loadBlockedHandled = false; 990 blockedLoadSeqNum = 0; 991 } 992 } 993 994 if (memDepViolator && squashed_num < memDepViolator->seqNum) { 995 memDepViolator = NULL; 996 } 997 998 int store_idx = storeTail; 999 decrStIdx(store_idx); 1000 1001 while (stores != 0 && 1002 storeQueue[store_idx].inst->seqNum > squashed_num) { 1003 // Instructions marked as can WB are already committed. 1004 if (storeQueue[store_idx].canWB) { 1005 break; 1006 } 1007 1008 DPRINTF(LSQUnit,"Store Instruction PC %s squashed, " 1009 "idx:%i [sn:%lli]\n", 1010 storeQueue[store_idx].inst->pcState(), 1011 store_idx, storeQueue[store_idx].inst->seqNum); 1012 1013 // I don't think this can happen. It should have been cleared 1014 // by the stalling load. 1015 if (isStalled() && 1016 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 1017 panic("Is stalled should have been cleared by stalling load!\n"); 1018 stalled = false; 1019 stallingStoreIsn = 0; 1020 } 1021 1022 // Clear the smart pointer to make sure it is decremented. 1023 storeQueue[store_idx].inst->setSquashed(); 1024 storeQueue[store_idx].inst = NULL; 1025 storeQueue[store_idx].canWB = 0; 1026 1027 // Must delete request now that it wasn't handed off to 1028 // memory. This is quite ugly. @todo: Figure out the proper 1029 // place to really handle request deletes. 1030 delete storeQueue[store_idx].req; 1031 if (TheISA::HasUnalignedMemAcc && storeQueue[store_idx].isSplit) { 1032 delete storeQueue[store_idx].sreqLow; 1033 delete storeQueue[store_idx].sreqHigh; 1034 1035 storeQueue[store_idx].sreqLow = NULL; 1036 storeQueue[store_idx].sreqHigh = NULL; 1037 } 1038 1039 storeQueue[store_idx].req = NULL; 1040 --stores; 1041 1042 // Inefficient! 1043 storeTail = store_idx; 1044 1045 decrStIdx(store_idx); 1046 ++lsqSquashedStores; 1047 } 1048} 1049 1050template <class Impl> 1051void 1052LSQUnit<Impl>::storePostSend(PacketPtr pkt) 1053{ 1054 if (isStalled() && 1055 storeQueue[storeWBIdx].inst->seqNum == stallingStoreIsn) { 1056 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1057 "load idx:%i\n", 1058 stallingStoreIsn, stallingLoadIdx); 1059 stalled = false; 1060 stallingStoreIsn = 0; 1061 iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 1062 } 1063 1064 if (!storeQueue[storeWBIdx].inst->isStoreConditional()) { 1065 // The store is basically completed at this time. This 1066 // only works so long as the checker doesn't try to 1067 // verify the value in memory for stores. 1068 storeQueue[storeWBIdx].inst->setCompleted(); 1069 1070 if (cpu->checker) { 1071 cpu->checker->verify(storeQueue[storeWBIdx].inst); 1072 } 1073 } 1074 1075 if (needsTSO) { 1076 storeInFlight = true; 1077 } 1078 1079 incrStIdx(storeWBIdx); 1080} 1081 1082template <class Impl> 1083void 1084LSQUnit<Impl>::writeback(DynInstPtr &inst, PacketPtr pkt) 1085{ 1086 iewStage->wakeCPU(); 1087 1088 // Squashed instructions do not need to complete their access. 1089 if (inst->isSquashed()) { 1090 iewStage->decrWb(inst->seqNum); 1091 assert(!inst->isStore()); 1092 ++lsqIgnoredResponses; 1093 return; 1094 } 1095 1096 if (!inst->isExecuted()) { 1097 inst->setExecuted(); 1098 1099 // Complete access to copy data to proper place. 1100 inst->completeAcc(pkt); 1101 } 1102 1103 // Need to insert instruction into queue to commit 1104 iewStage->instToCommit(inst); 1105 1106 iewStage->activityThisCycle(); 1107 1108 // see if this load changed the PC 1109 iewStage->checkMisprediction(inst); 1110} 1111 1112template <class Impl> 1113void 1114LSQUnit<Impl>::completeStore(int store_idx) 1115{ 1116 assert(storeQueue[store_idx].inst); 1117 storeQueue[store_idx].completed = true; 1118 --storesToWB; 1119 // A bit conservative because a store completion may not free up entries, 1120 // but hopefully avoids two store completions in one cycle from making 1121 // the CPU tick twice. 1122 cpu->wakeCPU(); 1123 cpu->activityThisCycle(); 1124 1125 if (store_idx == storeHead) { 1126 do { 1127 incrStIdx(storeHead); 1128 1129 --stores; 1130 } while (storeQueue[storeHead].completed && 1131 storeHead != storeTail); 1132 1133 iewStage->updateLSQNextCycle = true; 1134 } 1135 1136 DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " 1137 "idx:%i\n", 1138 storeQueue[store_idx].inst->seqNum, store_idx, storeHead); 1139 1140 if (isStalled() && 1141 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 1142 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1143 "load idx:%i\n", 1144 stallingStoreIsn, stallingLoadIdx); 1145 stalled = false; 1146 stallingStoreIsn = 0; 1147 iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 1148 } 1149 1150 storeQueue[store_idx].inst->setCompleted(); 1151 1152 if (needsTSO) { 1153 storeInFlight = false; 1154 } 1155 1156 // Tell the checker we've completed this instruction. Some stores 1157 // may get reported twice to the checker, but the checker can 1158 // handle that case. 1159 if (cpu->checker) { 1160 cpu->checker->verify(storeQueue[store_idx].inst); 1161 } 1162} 1163 1164template <class Impl> 1165bool 1166LSQUnit<Impl>::sendStore(PacketPtr data_pkt) 1167{ 1168 if (!dcachePort->sendTimingReq(data_pkt)) { 1169 // Need to handle becoming blocked on a store. 1170 isStoreBlocked = true; 1171 ++lsqCacheBlocked; 1172 assert(retryPkt == NULL); 1173 retryPkt = data_pkt; 1174 lsq->setRetryTid(lsqID); 1175 return false; 1176 } 1177 return true; 1178} 1179 1180template <class Impl> 1181void 1182LSQUnit<Impl>::recvRetry() 1183{ 1184 if (isStoreBlocked) { 1185 DPRINTF(LSQUnit, "Receiving retry: store blocked\n"); 1186 assert(retryPkt != NULL); 1187 1188 LSQSenderState *state = 1189 dynamic_cast<LSQSenderState *>(retryPkt->senderState); 1190 1191 if (dcachePort->sendTimingReq(retryPkt)) { 1192 // Don't finish the store unless this is the last packet. 1193 if (!TheISA::HasUnalignedMemAcc || !state->pktToSend || 1194 state->pendingPacket == retryPkt) { 1195 state->pktToSend = false; 1196 storePostSend(retryPkt); 1197 } 1198 retryPkt = NULL; 1199 isStoreBlocked = false; 1200 lsq->setRetryTid(InvalidThreadID); 1201 1202 // Send any outstanding packet. 1203 if (TheISA::HasUnalignedMemAcc && state->pktToSend) { 1204 assert(state->pendingPacket); 1205 if (sendStore(state->pendingPacket)) { 1206 storePostSend(state->pendingPacket); 1207 } 1208 } 1209 } else { 1210 // Still blocked! 1211 ++lsqCacheBlocked; 1212 lsq->setRetryTid(lsqID); 1213 } 1214 } else if (isLoadBlocked) { 1215 DPRINTF(LSQUnit, "Loads squash themselves and all younger insts, " 1216 "no need to resend packet.\n"); 1217 } else { 1218 DPRINTF(LSQUnit, "Retry received but LSQ is no longer blocked.\n"); 1219 } 1220} 1221 1222template <class Impl> 1223inline void 1224LSQUnit<Impl>::incrStIdx(int &store_idx) const 1225{ 1226 if (++store_idx >= SQEntries) 1227 store_idx = 0; 1228} 1229 1230template <class Impl> 1231inline void 1232LSQUnit<Impl>::decrStIdx(int &store_idx) const 1233{ 1234 if (--store_idx < 0) 1235 store_idx += SQEntries; 1236} 1237 1238template <class Impl> 1239inline void 1240LSQUnit<Impl>::incrLdIdx(int &load_idx) const 1241{ 1242 if (++load_idx >= LQEntries) 1243 load_idx = 0; 1244} 1245 1246template <class Impl> 1247inline void 1248LSQUnit<Impl>::decrLdIdx(int &load_idx) const 1249{ 1250 if (--load_idx < 0) 1251 load_idx += LQEntries; 1252} 1253 1254template <class Impl> 1255void 1256LSQUnit<Impl>::dumpInsts() const 1257{ 1258 cprintf("Load store queue: Dumping instructions.\n"); 1259 cprintf("Load queue size: %i\n", loads); 1260 cprintf("Load queue: "); 1261 1262 int load_idx = loadHead; 1263 1264 while (load_idx != loadTail && loadQueue[load_idx]) { 1265 const DynInstPtr &inst(loadQueue[load_idx]); 1266 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum); 1267 1268 incrLdIdx(load_idx); 1269 } 1270 cprintf("\n"); 1271 1272 cprintf("Store queue size: %i\n", stores); 1273 cprintf("Store queue: "); 1274 1275 int store_idx = storeHead; 1276 1277 while (store_idx != storeTail && storeQueue[store_idx].inst) { 1278 const DynInstPtr &inst(storeQueue[store_idx].inst); 1279 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum); 1280 1281 incrStIdx(store_idx); 1282 } 1283 1284 cprintf("\n"); 1285}
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