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/*
* Copyright (c) 2011,2013 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) 2006 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: Kevin Lim
* Geoffrey Blake
*/
#include "cpu/checker/cpu.hh"
#include <list>
#include <string>
#include "arch/generic/tlb.hh"
#include "arch/kernel_stats.hh"
#include "arch/vtophys.hh"
#include "cpu/base.hh"
#include "cpu/simple_thread.hh"
#include "cpu/static_inst.hh"
#include "cpu/thread_context.hh"
#include "params/CheckerCPU.hh"
#include "sim/full_system.hh"
using namespace std;
using namespace TheISA;
void
CheckerCPU::init()
{
masterId = systemPtr->getMasterId(name());
}
CheckerCPU::CheckerCPU(Params *p)
: BaseCPU(p, true), systemPtr(NULL), icachePort(NULL), dcachePort(NULL),
tc(NULL), thread(NULL)
{
memReq = NULL;
curStaticInst = NULL;
curMacroStaticInst = NULL;
numInst = 0;
startNumInst = 0;
numLoad = 0;
startNumLoad = 0;
youngestSN = 0;
changedPC = willChangePC = false;
exitOnError = p->exitOnError;
warnOnlyOnLoadError = p->warnOnlyOnLoadError;
itb = p->itb;
dtb = p->dtb;
workload = p->workload;
updateOnError = true;
}
CheckerCPU::~CheckerCPU()
{
}
void
CheckerCPU::setSystem(System *system)
{
const Params *p(dynamic_cast<const Params *>(_params));
systemPtr = system;
if (FullSystem) {
thread = new SimpleThread(this, 0, systemPtr, itb, dtb,
p->isa[0], false);
} else {
thread = new SimpleThread(this, 0, systemPtr,
workload.size() ? workload[0] : NULL,
itb, dtb, p->isa[0]);
}
tc = thread->getTC();
threadContexts.push_back(tc);
thread->kernelStats = NULL;
// Thread should never be null after this
assert(thread != NULL);
}
void
CheckerCPU::setIcachePort(MasterPort *icache_port)
{
icachePort = icache_port;
}
void
CheckerCPU::setDcachePort(MasterPort *dcache_port)
{
dcachePort = dcache_port;
}
void
CheckerCPU::serialize(ostream &os) const
{
}
void
CheckerCPU::unserialize(CheckpointIn &cp)
{
}
Fault
CheckerCPU::readMem(Addr addr, uint8_t *data, unsigned size,
Request::Flags flags)
{
Fault fault = NoFault;
int fullSize = size;
Addr secondAddr = roundDown(addr + size - 1, cacheLineSize());
bool checked_flags = false;
bool flags_match = true;
Addr pAddr = 0x0;
if (secondAddr > addr)
size = secondAddr - addr;
// Need to account for multiple accesses like the Atomic and TimingSimple
while (1) {
memReq = new Request(0, addr, size, flags, masterId,
thread->pcState().instAddr(), tc->contextId());
// translate to physical address
fault = dtb->translateFunctional(memReq, tc, BaseTLB::Read);
if (!checked_flags && fault == NoFault && unverifiedReq) {
flags_match = checkFlags(unverifiedReq, memReq->getVaddr(),
memReq->getPaddr(), memReq->getFlags());
pAddr = memReq->getPaddr();
checked_flags = true;
}
// Now do the access
if (fault == NoFault &&
!memReq->getFlags().isSet(Request::NO_ACCESS)) {
PacketPtr pkt = Packet::createRead(memReq);
pkt->dataStatic(data);
if (!(memReq->isUncacheable() || memReq->isMmappedIpr())) {
// Access memory to see if we have the same data
dcachePort->sendFunctional(pkt);
} else {
// Assume the data is correct if it's an uncached access
memcpy(data, unverifiedMemData, size);
}
delete memReq;
memReq = NULL;
delete pkt;
}
if (fault != NoFault) {
if (memReq->isPrefetch()) {
fault = NoFault;
}
delete memReq;
memReq = NULL;
break;
}
if (memReq != NULL) {
delete memReq;
}
//If we don't need to access a second cache line, stop now.
if (secondAddr <= addr)
{
break;
}
// Setup for accessing next cache line
data += size;
unverifiedMemData += size;
size = addr + fullSize - secondAddr;
addr = secondAddr;
}
if (!flags_match) {
warn("%lli: Flags do not match CPU:%#x %#x %#x Checker:%#x %#x %#x\n",
curTick(), unverifiedReq->getVaddr(), unverifiedReq->getPaddr(),
unverifiedReq->getFlags(), addr, pAddr, flags);
handleError();
}
return fault;
}
Fault
CheckerCPU::writeMem(uint8_t *data, unsigned size,
Addr addr, Request::Flags flags, uint64_t *res)
{
Fault fault = NoFault;
bool checked_flags = false;
bool flags_match = true;
Addr pAddr = 0x0;
static uint8_t zero_data[64] = {};
int fullSize = size;
Addr secondAddr = roundDown(addr + size - 1, cacheLineSize());
if (secondAddr > addr)
size = secondAddr - addr;
// Need to account for a multiple access like Atomic and Timing CPUs
while (1) {
memReq = new Request(0, addr, size, flags, masterId,
thread->pcState().instAddr(), tc->contextId());
// translate to physical address
fault = dtb->translateFunctional(memReq, tc, BaseTLB::Write);
if (!checked_flags && fault == NoFault && unverifiedReq) {
flags_match = checkFlags(unverifiedReq, memReq->getVaddr(),
memReq->getPaddr(), memReq->getFlags());
pAddr = memReq->getPaddr();
checked_flags = true;
}
/*
* We don't actually check memory for the store because there
* is no guarantee it has left the lsq yet, and therefore we
* can't verify the memory on stores without lsq snooping
* enabled. This is left as future work for the Checker: LSQ snooping
* and memory validation after stores have committed.
*/
bool was_prefetch = memReq->isPrefetch();
delete memReq;
//If we don't need to access a second cache line, stop now.
if (fault != NoFault || secondAddr <= addr)
{
if (fault != NoFault && was_prefetch) {
fault = NoFault;
}
break;
}
//Update size and access address
size = addr + fullSize - secondAddr;
//And access the right address.
addr = secondAddr;
}
if (!flags_match) {
warn("%lli: Flags do not match CPU:%#x %#x Checker:%#x %#x %#x\n",
curTick(), unverifiedReq->getVaddr(), unverifiedReq->getPaddr(),
unverifiedReq->getFlags(), addr, pAddr, flags);
handleError();
}
// Assume the result was the same as the one passed in. This checker
// doesn't check if the SC should succeed or fail, it just checks the
// value.
if (unverifiedReq && res && unverifiedReq->extraDataValid())
*res = unverifiedReq->getExtraData();
// Entire purpose here is to make sure we are getting the
// same data to send to the mem system as the CPU did.
// Cannot check this is actually what went to memory because
// there stores can be in ld/st queue or coherent operations
// overwriting values.
bool extraData = false;
if (unverifiedReq) {
extraData = unverifiedReq->extraDataValid() ?
unverifiedReq->getExtraData() : true;
}
// If the request is to ZERO a cache block, there is no data to check
// against, but it's all zero. We need something to compare to, so use a
// const set of zeros.
if (flags & Request::CACHE_BLOCK_ZERO) {
assert(!data);
assert(sizeof(zero_data) <= fullSize);
data = zero_data;
}
if (unverifiedReq && unverifiedMemData &&
memcmp(data, unverifiedMemData, fullSize) && extraData) {
warn("%lli: Store value does not match value sent to memory! "
"data: %#x inst_data: %#x", curTick(), data,
unverifiedMemData);
handleError();
}
return fault;
}
Addr
CheckerCPU::dbg_vtophys(Addr addr)
{
return vtophys(tc, addr);
}
/**
* Checks if the flags set by the Checker and Checkee match.
*/
bool
CheckerCPU::checkFlags(Request *unverified_req, Addr vAddr,
Addr pAddr, int flags)
{
Addr unverifiedVAddr = unverified_req->getVaddr();
Addr unverifiedPAddr = unverified_req->getPaddr();
int unverifiedFlags = unverified_req->getFlags();
if (unverifiedVAddr != vAddr ||
unverifiedPAddr != pAddr ||
unverifiedFlags != flags) {
return false;
}
return true;
}
void
CheckerCPU::dumpAndExit()
{
warn("%lli: Checker PC:%s",
curTick(), thread->pcState());
panic("Checker found an error!");
}