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/*
* Copyright (c) 2020-2021 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
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* modified or unmodified, in source code or in binary form.
*
* 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
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "arch/arm/faults.hh"
#include "arch/arm/htm.hh"
#include "arch/arm/insts/tme64.hh"
#include "arch/generic/memhelpers.hh"
#include "debug/ArmTme.hh"
#include "mem/packet_access.hh"
#include "mem/request.hh"
namespace gem5
{
using namespace ArmISA;
namespace ArmISAInst {
Fault
Tstart64::initiateAcc(ExecContext *xc,
Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
const uint64_t htm_depth = xc->getHtmTransactionalDepth();
DPRINTF(ArmTme, "tme depth is %d\n", htm_depth);
// Maximum TME nesting depth exceeded
if (htm_depth > ArmISA::HTMCheckpoint::MAX_HTM_DEPTH) {
const uint64_t htm_uid = xc->getHtmTransactionUid();
fault = std::make_shared<GenericHtmFailureFault>(
htm_uid, HtmFailureFaultCause::NEST);
}
if (fault == NoFault) {
Request::Flags memAccessFlags =
Request::STRICT_ORDER|Request::PHYSICAL|Request::HTM_START;
// Nested transaction start/stops never leave the core.
// These Requests are marked as NO_ACCESS to indicate that the request
// should not be sent to the cache controller.
if (htm_depth > 1) {
memAccessFlags = memAccessFlags | Request::NO_ACCESS;
}
fault = xc->initiateMemMgmtCmd(memAccessFlags);
}
return fault;
}
Fault
Tstart64::completeAcc(PacketPtr pkt, ExecContext *xc,
Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
uint64_t Mem;
uint64_t Dest64 = 0;
ThreadContext *tc = xc->tcBase();
const uint64_t htm_depth = xc->getHtmTransactionalDepth();
getMemLE(pkt, Mem, traceData);
// sanity check
if (Mem != 0) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
// sanity check
if (!xc->inHtmTransactionalState()) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
if (fault == NoFault) {
Dest64 = 0x0; // tstart returns 0 on success
// checkpointing occurs in the outer transaction only
if (htm_depth == 1) {
BaseHTMCheckpointPtr& cpt = xc->tcBase()->getHtmCheckpointPtr();
HTMCheckpoint *armcpt =
dynamic_cast<HTMCheckpoint*>(cpt.get());
assert(armcpt != nullptr);
armcpt->save(tc);
armcpt->destinationRegister(dest);
tc->getIsaPtr()->globalClearExclusive();
}
xc->setRegOperand(this, 0, (Dest64) & mask(intWidth));
uint64_t final_val = Dest64;
if (traceData) { traceData->setData(final_val); }
}
return fault;
}
Fault
Ttest64::execute(ExecContext *xc, Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
uint64_t Dest64 = 0;
const uint64_t htm_depth = xc->getHtmTransactionalDepth();
// sanity check
if (htm_depth > ArmISA::HTMCheckpoint::MAX_HTM_DEPTH) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
Dest64 = htm_depth;
// sanity check
if (Dest64 == 0)
assert(!xc->inHtmTransactionalState());
else
assert(xc->inHtmTransactionalState());
if (fault == NoFault) {
uint64_t final_val = Dest64;
xc->setRegOperand(this, 0, (Dest64) & mask(intWidth));
if (traceData) { traceData->setData(final_val); }
}
return fault;
}
Fault
Tcancel64::initiateAcc(ExecContext *xc, Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
// sanity check
if (!xc->inHtmTransactionalState()) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
Request::Flags memAccessFlags =
Request::STRICT_ORDER|Request::PHYSICAL|Request::HTM_CANCEL;
fault = xc->initiateMemMgmtCmd(memAccessFlags);
return fault;
}
Fault
Tcancel64::completeAcc(PacketPtr pkt, ExecContext *xc,
Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
uint64_t Mem;
getMemLE(pkt, Mem, traceData);
// sanity check
if (Mem != 0) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
if (fault == NoFault) {
auto tme_checkpoint = static_cast<HTMCheckpoint*>(
xc->tcBase()->getHtmCheckpointPtr().get());
tme_checkpoint->cancelReason(imm);
fault = std::make_shared<GenericHtmFailureFault>(
xc->getHtmTransactionUid(),
HtmFailureFaultCause::EXPLICIT);
}
return fault;
}
Fault
MicroTcommit64::initiateAcc(ExecContext *xc,
Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
const uint64_t htm_depth = xc->getHtmTransactionalDepth();
// sanity check
if (!xc->inHtmTransactionalState()) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
DPRINTF(ArmTme, "tme depth is %d\n", htm_depth);
Request::Flags memAccessFlags =
Request::STRICT_ORDER|Request::PHYSICAL|Request::HTM_COMMIT;
// Nested transaction start/stops never leave the core.
// These Requests are marked as NO_ACCESS to indicate that the request
// should not be sent to the cache controller.
if (htm_depth > 1) {
memAccessFlags = memAccessFlags | Request::NO_ACCESS;
}
fault = xc->initiateMemMgmtCmd(memAccessFlags);
return fault;
}
Fault
MicroTcommit64::completeAcc(PacketPtr pkt, ExecContext *xc,
Trace::InstRecord *traceData) const
{
Fault fault = NoFault;
uint64_t Mem;
ThreadContext *tc = xc->tcBase();
const uint64_t htm_depth = xc->getHtmTransactionalDepth();
getMemLE(pkt, Mem, traceData);
// sanity check
if (Mem != 0) {
fault = std::make_shared<IllegalInstSetStateFault>();
}
if (fault == NoFault) {
if (htm_depth == 1) {
auto tme_checkpoint = static_cast<HTMCheckpoint*>(
xc->tcBase()->getHtmCheckpointPtr().get());
assert(tme_checkpoint);
assert(tme_checkpoint->valid());
tme_checkpoint->reset();
tc->getIsaPtr()->globalClearExclusive();
}
}
return fault;
}
} // namespace ArmISAInst
} // namespace gem5