Gem5 abstract_mem.cc (ongoing modification)

abstract_mem.cc

/*
 * Copyright (c) 2010-2012,2017 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2001-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Ron Dreslinski
 *          Ali Saidi
 *          Andreas Hansson
 */

#include "mem/abstract_mem.hh"

#include <vector>
#include <map>

#include "arch/locked_mem.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "debug/LLSC.hh"
#include "debug/ShadowMem.hh"
#include "debug/MemoryAccess.hh"
#include "mem/packet_access.hh"
#include "sim/system.hh"

//constants
#define N_DIR 8
#define M_IND 0xFC0
#define MASK 0xFFFF000
#define SHIFT 6

/*
 *
 *#define M_IND 0x7C0
 *#define MASK 0xFFFF800
 *#define M_IND 0xFC0
 *#define MASK 0xFFFF000
 *#define M_IND 0x1FC0
 *#define MASK 0xFFFE000
 *
 **/
using namespace std;

struct dirEntry{
    //PacketPtr pkt;
    Addr entryAddr;
    int ctrA;
    int ctrB;
    dirEntry ( Addr ENTRYADDR = 0, int CTRA=0, int CTRB=0 ) : entryAddr(ENTRYADDR), ctrA(CTRA), ctrB(CTRB){}
};

map<Addr,dirEntry> direc;

PacketPtr *di = (PacketPtr*)malloc(sizeof(PacketPtr)*(1<<SHIFT));

uint64_t noOfWrites = 1; //cause they will miss counting the last one
uint64_t noOfSwaps = 1;



AbstractMemory::AbstractMemory(const Params *p) :
    MemObject(p), range(params()->range), pmemAddr(NULL),
    confTableReported(p->conf_table_reported), inAddrMap(p->in_addr_map),
    kvmMap(p->kvm_map), _system(NULL)
{
}

void
AbstractMemory::init()
{
    assert(system());

    if (size() % _system->getPageBytes() != 0)
        panic("Memory Size not divisible by page size\n");
}

void
AbstractMemory::setBackingStore(uint8_t* pmem_addr)
{
    pmemAddr = pmem_addr;
}

void
AbstractMemory::regStats()
{
    MemObject::regStats();

    using namespace Stats;

    assert(system());

    bytesRead
        .init(system()->maxMasters())
        .name(name() + ".bytes_read")
        .desc("Number of bytes read from this memory")
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bytesRead.subname(i, system()->getMasterName(i));
    }
    bytesInstRead
        .init(system()->maxMasters())
        .name(name() + ".bytes_inst_read")
        .desc("Number of instructions bytes read from this memory")
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bytesInstRead.subname(i, system()->getMasterName(i));
    }
    bytesWritten
        .init(system()->maxMasters())
        .name(name() + ".bytes_written")
        .desc("Number of bytes written to this memory")
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bytesWritten.subname(i, system()->getMasterName(i));
    }
    numReads
        .init(system()->maxMasters())
        .name(name() + ".num_reads")
        .desc("Number of read requests responded to by this memory")
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        numReads.subname(i, system()->getMasterName(i));
    }
    numWrites
        .init(system()->maxMasters())
        .name(name() + ".num_writes")
        .desc("Number of write requests responded to by this memory")
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        numWrites.subname(i, system()->getMasterName(i));
    }
    numOther
        .init(system()->maxMasters())
        .name(name() + ".num_other")
        .desc("Number of other requests responded to by this memory")
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        numOther.subname(i, system()->getMasterName(i));
    }
    bwRead
        .name(name() + ".bw_read")
        .desc("Total read bandwidth from this memory (bytes/s)")
        .precision(0)
        .prereq(bytesRead)
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bwRead.subname(i, system()->getMasterName(i));
    }

    bwInstRead
        .name(name() + ".bw_inst_read")
        .desc("Instruction read bandwidth from this memory (bytes/s)")
        .precision(0)
        .prereq(bytesInstRead)
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bwInstRead.subname(i, system()->getMasterName(i));
    }
    bwWrite
        .name(name() + ".bw_write")
        .desc("Write bandwidth from this memory (bytes/s)")
        .precision(0)
        .prereq(bytesWritten)
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bwWrite.subname(i, system()->getMasterName(i));
    }
    bwTotal
        .name(name() + ".bw_total")
        .desc("Total bandwidth to/from this memory (bytes/s)")
        .precision(0)
        .prereq(bwTotal)
        .flags(total | nozero | nonan)
        ;
    for (int i = 0; i < system()->maxMasters(); i++) {
        bwTotal.subname(i, system()->getMasterName(i));
    }
    bwRead = bytesRead / simSeconds;
    bwInstRead = bytesInstRead / simSeconds;
    bwWrite = bytesWritten / simSeconds;
    bwTotal = (bytesRead + bytesWritten) / simSeconds;
}

AddrRange
AbstractMemory::getAddrRange() const
{
    return range;
}

// Add load-locked to tracking list.  Should only be called if the
// operation is a load and the LLSC flag is set.
void
AbstractMemory::trackLoadLocked(PacketPtr pkt)
{
    const RequestPtr &req = pkt->req;
    Addr paddr = LockedAddr::mask(req->getPaddr());

    // first we check if we already have a locked addr for this
    // xc.  Since each xc only gets one, we just update the
    // existing record with the new address.
    list<LockedAddr>::iterator i;

    for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) {
        if (i->matchesContext(req)) {
            DPRINTF(LLSC, "Modifying lock record: context %d addr %#x\n",
                    req->contextId(), paddr);
            i->addr = paddr;
            return;
        }
    }

    // no record for this xc: need to allocate a new one
    DPRINTF(LLSC, "Adding lock record: context %d addr %#x\n",
            req->contextId(), paddr);
    lockedAddrList.push_front(LockedAddr(req));
}


// Called on *writes* only... both regular stores and
// store-conditional operations.  Check for conventional stores which
// conflict with locked addresses, and for success/failure of store
// conditionals.
bool
AbstractMemory::checkLockedAddrList(PacketPtr pkt)
{
    const RequestPtr &req = pkt->req;
    Addr paddr = LockedAddr::mask(req->getPaddr());
    bool isLLSC = pkt->isLLSC();

    // Initialize return value.  Non-conditional stores always
    // succeed.  Assume conditional stores will fail until proven
    // otherwise.
    bool allowStore = !isLLSC;

    // Iterate over list.  Note that there could be multiple matching records,
    // as more than one context could have done a load locked to this location.
    // Only remove records when we succeed in finding a record for (xc, addr);
    // then, remove all records with this address.  Failed store-conditionals do
    // not blow unrelated reservations.
    list<LockedAddr>::iterator i = lockedAddrList.begin();

    if (isLLSC) {
        while (i != lockedAddrList.end()) {
            if (i->addr == paddr && i->matchesContext(req)) {
                // it's a store conditional, and as far as the memory system can
                // tell, the requesting context's lock is still valid.
                DPRINTF(LLSC, "StCond success: context %d addr %#x\n",
                        req->contextId(), paddr);
                allowStore = true;
                break;
            }
            // If we didn't find a match, keep searching!  Someone else may well
            // have a reservation on this line here but we may find ours in just
            // a little while.
            i++;
        }
        req->setExtraData(allowStore ? 1 : 0);
    }
    // LLSCs that succeeded AND non-LLSC stores both fall into here:
    if (allowStore) {
        // We write address paddr.  However, there may be several entries with a
        // reservation on this address (for other contextIds) and they must all
        // be removed.
        i = lockedAddrList.begin();
        while (i != lockedAddrList.end()) {
            if (i->addr == paddr) {
                DPRINTF(LLSC, "Erasing lock record: context %d addr %#x\n",
                        i->contextId, paddr);
                ContextID owner_cid = i->contextId;
                ContextID requester_cid = pkt->req->contextId();
                if (owner_cid != requester_cid) {
                    ThreadContext* ctx = system()->getThreadContext(owner_cid);
                    TheISA::globalClearExclusive(ctx);
                }
                i = lockedAddrList.erase(i);
            } else {
                i++;
            }
        }
    }

    return allowStore;
}


#if TRACING_ON

#define CASE(A, T)                                                        \
  case sizeof(T):                                                         \
    DPRINTF(MemoryAccess,"%s from %s of size %i on address 0x%x data " \
            "0x%x %c\n", A, system()->getMasterName(pkt->req->masterId()),\
            pkt->getSize(), pkt->getAddr(), pkt->get<T>(),                \
            pkt->req->isUncacheable() ? 'U' : 'C');                       \
  break


#define TRACE_PACKET(A)                                                 \
    do {                                                                \
        switch (pkt->getSize()) {                                       \
          CASE(A, uint64_t);                                            \
          CASE(A, uint32_t);                                            \
          CASE(A, uint16_t);                                            \
          CASE(A, uint8_t);                                             \
          default:                                                      \
            DPRINTF(MemoryAccess, "%s from %s of size %i on address 0x%x %c\n",\
                    A, system()->getMasterName(pkt->req->masterId()),          \
                    pkt->getSize(), pkt->getAddr(),                            \
                    pkt->req->isUncacheable() ? 'U' : 'C');                    \
            DDUMP(MemoryAccess, pkt->getConstPtr<uint8_t>(), pkt->getSize());  \
        }                                                                      \
    } while (0)

#else

#define TRACE_PACKET(A)

#endif

//PHASE_1_START
PacketPtr AbstractMemory::BeforeWrite(PacketPtr pkt,uint8_t *hostAddrNVRAM){
    int wid=0; //Write into dram
    //uint8_t *hostAddrDRAM = pmemAddr + ((pkt->getAddr()&M_IND)) + range.end(); //somwthing is wrong with this
    Addr dirAddr = ((pkt->getAddr()&M_IND)>>SHIFT);
    //*(di + dirAddr) = pkt;
    if(pkt->getSize() == 64){ //&& pkt->fromCache() 

        //DPRINTF(ShadowMem,"%x\n",(pkt->getAddr()));
        //DPRINTF(ShadowMem,"BeforeWrite-> dirAddr: %d Counter A: %d Counter B: %d Size: %d NOW: %x NOS: %x \n",dirAddr,direc[dirAddr].ctrA,direc[dirAddr].ctrB,pkt->getSize(),noOfWrites,noOfSwaps);
        noOfWrites++;
        if(direc[dirAddr].entryAddr != INT_MIN)
        {    //DPRINTF(ShadowMem,"hostA:%x dirA:%x ENTERED THE IF Stored address:%x\n",*hostAddr,dirAddr,direc[dirAddr].entryAddr);
            //DPRINTF(ShadowMem,"%x\n",(pkt->getAddr()));
            dirEntry temp = direc[dirAddr];
            //if both addr are same (temp = OperationalBuffer)
            //check anything is repeating

            if((pkt->getAddr()&MASK) == (temp.entryAddr&MASK)){

                temp.ctrA++;
                if(temp.ctrA >= N_DIR){
                    temp.ctrA = 1;
                    wid = 1;
                }
                else
                    wid = 1;
            }
            else{
                //DPRINTF(ShadowMem,"(pkt->getAddr()&0xFFFF000):%x (temp.entryAddr&0xFFFF000):%x ENTERED THE else :%d\n",(pkt->getAddr()&0xFFFF000),(temp.entryAddr&0xFFFF000),direc.size());
                temp.ctrB++;
                if(temp.ctrB >= N_DIR){
                    temp.ctrB = 1;
                    //DataSwap(); NEXT STEP IMPLEMENT THIS - DONE
                    //memcpy(hostAddrNVRAM,hostAddrDRAM, pkt->getSize()); //This may not be true always
		            memcpy(hostAddrNVRAM, (*(di + dirAddr))->getConstPtr<uint8_t>(), (*(di + dirAddr))->getSize());
                    temp.entryAddr = pkt->getAddr();
                    //temp.ctrA = 1;
                    noOfSwaps++;
                    //memcpy((di + dirAddr), pkt->getConstPtr<uint8_t>(), pkt->getSize());
		    *(di + dirAddr) = pkt;
                }
            }
            direc[dirAddr] = temp;
            temp = {0,0,0};
        }
        else{
            direc[dirAddr] = {pkt->getAddr(),1,1};
            //memcpy((di + dirAddr), pkt->getConstPtr<uint8_t>(), pkt->getSize());
	    	wid = 1;
        }
    }
    if(wid){
        //memcpy((di + dirAddr), pkt->getConstPtr<uint8_t>(), pkt->getSize());
	*(di + dirAddr) = pkt;
    }
    else{
        memcpy(hostAddrNVRAM, pkt->getConstPtr<uint8_t>(), pkt->getSize());
    }
    return pkt;
}

PacketPtr AbstractMemory::BeforeRead(PacketPtr pkt,uint8_t* hostAddrNVRAM){
    int rfd=0; //READ FROM DRAM
    //uint8_t *hostAddrDRAM = pmemAddr + ((pkt->getAddr()&M_IND)) + range.end();
    Addr dirAddr = ((pkt->getAddr()&M_IND)>>SHIFT);
    if(pkt->getSize() == 64){ //pkt->getSize() == 64 && && pkt->fromCache()
        if(direc[dirAddr].entryAddr != 0)
        {	dirEntry temp = direc[dirAddr];   
		//DPRINTF(ShadowMem,"hostA:%x dirA:%x dirA&MASK:%x temp&MASK:%x ENTERED THE IF Stored address:%x\n",*hostAddrDRAM,dirAddr,(pkt->getAddr()&MASK), (temp.entryAddr&MASK));
            
            //if both addr are same (temp = OperationalBuffer)
            //check anything is repeating
	    DPRINTF(ShadowMem,"Reading\n");
            if((pkt->getAddr()&MASK) == (temp.entryAddr&MASK)){
                    rfd = 1;
			DPRINTF(ShadowMem,"Reading: Both are semi same\n");
			if((pkt->getAddr()) == (temp.entryAddr))
				DPRINTF(ShadowMem,"Reading: Both are same\n");
				
            }
            else{
                    rfd = 0;
            }
            temp = {0,0,0};
        }
        else{
            //DPRINTF(ShadowMem,"Address doesnt exist in diectory\n");
        }
    }
    if(rfd){
        pkt = *(di + dirAddr);
    }
    else{
        memcpy(pkt->getPtr<uint8_t>(),hostAddrNVRAM, pkt->getSize());
    }
    return pkt;
}

void
AbstractMemory::access(PacketPtr pkt)
{
    if (pkt->cacheResponding()) {
        DPRINTF(MemoryAccess, "Cache responding to %#llx: not responding\n",
                pkt->getAddr());
        return;
    }

    if (pkt->cmd == MemCmd::CleanEvict || pkt->cmd == MemCmd::WritebackClean) {
        DPRINTF(MemoryAccess, "CleanEvict  on 0x%x: not responding\n",
                pkt->getAddr());
      return;
    }

    assert(AddrRange(pkt->getAddr(),
                     pkt->getAddr() + (pkt->getSize() - 1)).isSubset(range));

    uint8_t *hostAddr = pmemAddr + pkt->getAddr() - range.start();

    //DPRINTF(ShadowMem,"hostA:%x pmemA:%d pktA:%x Range:%x\n",*hostAddr,pmemAddr,pkt->getAddr(),range.start());


    if (pkt->cmd == MemCmd::SwapReq) {
        if (pkt->isAtomicOp()) {
            if (pmemAddr) {
                memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
                (*(pkt->getAtomicOp()))(hostAddr);
            }
        } else {
            std::vector<uint8_t> overwrite_val(pkt->getSize());
            uint64_t condition_val64;
            uint32_t condition_val32;

            if (!pmemAddr)
                panic("Swap only works if there is real memory (i.e. null=False)");

            bool overwrite_mem = true;
            // keep a copy of our possible write value, and copy what is at the
            // memory address into the packet
            std::memcpy(&overwrite_val[0], pkt->getConstPtr<uint8_t>(),
                        pkt->getSize());
            std::memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());

            if (pkt->req->isCondSwap()) {
                if (pkt->getSize() == sizeof(uint64_t)) {
                    condition_val64 = pkt->req->getExtraData();
                    overwrite_mem = !std::memcmp(&condition_val64, hostAddr,
                                                 sizeof(uint64_t));
                } else if (pkt->getSize() == sizeof(uint32_t)) {
                    condition_val32 = (uint32_t)pkt->req->getExtraData();
                    overwrite_mem = !std::memcmp(&condition_val32, hostAddr,
                                                 sizeof(uint32_t));
                } else
                    panic("Invalid size for conditional read/write\n");
            }

            if (overwrite_mem)
                std::memcpy(hostAddr, &overwrite_val[0], pkt->getSize());

            assert(!pkt->req->isInstFetch());
            TRACE_PACKET("Read/Write");
            numOther[pkt->req->masterId()]++;
        }
    } else if (pkt->isRead()) {
        assert(!pkt->isWrite());
        if (pkt->isLLSC()) {
            assert(!pkt->fromCache());
            // if the packet is not coming from a cache then we have
            // to do the LL/SC tracking here
            trackLoadLocked(pkt);
        }
        if (pmemAddr){
            //PHASE_1
            BeforeRead(pkt,hostAddr);

            //memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
            /*
            if(pkt->fromCache()){
                if(direc[((pkt->getAddr()&0xFC0) >> 6)].entryAddr != 0){
                    DPRINTF(ShadowMem,"In funcAcc Directory Addr:%x Counter B:%x Cmdstr:%s \n",pkt->getAddr(),direc[((pkt->getAddr()&&0xFC0))].ctrB,pkt->cmdString());
                }
            }*/

        }
        TRACE_PACKET(pkt->req->isInstFetch() ? "IFetch" : "Read");
        numReads[pkt->req->masterId()]++;
        bytesRead[pkt->req->masterId()] += pkt->getSize();
        if (pkt->req->isInstFetch())
            bytesInstRead[pkt->req->masterId()] += pkt->getSize();
    } else if (pkt->isInvalidate() || pkt->isClean()) {
        assert(!pkt->isWrite());
        // in a fastmem system invalidating and/or cleaning packets
        // can be seen due to cache maintenance requests

        // no need to do anything
    } else if (pkt->isWrite()) {
        if (writeOK(pkt)) {
            if (pmemAddr) {
                //PHASE_1
                pkt = BeforeWrite(pkt,hostAddr);

                //memcpy(hostAddr, pkt->getConstPtr<uint8_t>(), pkt->getSize());
                //DPRINTF(MemoryAccess, "%s wrote %i bytes to address %x\n",
                //        __func__, pkt->getSize(), pkt->getAddr());

                //DPRINTF(ShadowMem,"Entered AbstractMemory::Access::Write() :Size %d %s %x cmd:%s\n",
                //   pkt->getSize(),pkt->cmdString(),pkt->getAddr(),pkt->cmdString()); //PHASE_1


            }
            assert(!pkt->req->isInstFetch());
            TRACE_PACKET("Write");
            numWrites[pkt->req->masterId()]++;
            bytesWritten[pkt->req->masterId()] += pkt->getSize();
        }
    } else {
        panic("Unexpected packet %s", pkt->print());
    }

    if (pkt->needsResponse()) {
        pkt->makeResponse();
    }
}

void
AbstractMemory::functionalAccess(PacketPtr pkt)
{
    assert(AddrRange(pkt->getAddr(),
                     pkt->getAddr() + pkt->getSize() - 1).isSubset(range));

    uint8_t *hostAddr = pmemAddr + pkt->getAddr() - range.start();

    //DPRINTF(ShadowMem,"hostA:%x pmemA:%x pktA:%x Range:%x\n",*hostAddr,pmemAddr,pkt->getAddr(),range.start());
    if (pkt->isRead()) {
        if (pmemAddr){
            //PHASE_1
            BeforeRead(pkt,hostAddr);
            //memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
            /*
            if(pkt->fromCache()){
                if(direc[((pkt->getAddr()&0xFC0) >> 6)].entryAddr != 0){
                    //DPRINTF(ShadowMem,"In funcAcc Directory Addr:%x Counter A:%x Cmdstr:%s //\n",pkt->getAddr(),direc[pkt->getAddr()/S_DIR].ctrA,pkt->cmdString());
                }
            }
            */
        }
        TRACE_PACKET("Read");
        pkt->makeResponse();
    } else if (pkt->isWrite()) {
        if (pmemAddr){
            //PHASE_1
            BeforeWrite(pkt,hostAddr);

            //DPRINTF(ShadowMem,"Entered AbstractMemory::funcAccess::Write() :Size %d %s %x cmd:%s\n",
                   //pkt->getSize(),pkt->cmdString(),pkt->getAddr(),pkt->cmdString()); //PHASE_1

            /*if(pkt->getAddr()%S_DIR == 0 && pkt->fromCache()){
                if(direc[pkt->getAddr()/S_DIR].ctrA == 0){
                    direc[pkt->getAddr()/S_DIR] = {pkt,1,1};
                }
            }*/
            //memcpy(hostAddr, pkt->getConstPtr<uint8_t>(), pkt->getSize());
        }
        TRACE_PACKET("Write");
        pkt->makeResponse();
    } else if (pkt->isPrint()) {
        Packet::PrintReqState *prs =
            dynamic_cast<Packet::PrintReqState*>(pkt->senderState);
        assert(prs);
        // Need to call printLabels() explicitly since we're not going
        // through printObj().
        prs->printLabels();
        // Right now we just print the single byte at the specified address.
        ccprintf(prs->os, "%s%#x\n", prs->curPrefix(), *hostAddr);
    } else {
        panic("AbstractMemory: unimplemented functional command %s",
              pkt->cmdString());
    }
}
//build/X86/gem5.opt --debug-flag=ShadowMem configs/example/se.py --cmd='parsec/install/bin/blackscholes' --options="64 parsec/install/inputs/blackscholes/in_64K.txt parsec/install/inputs/blackscholes/prices.txt" --mem-size=512MB