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/*
* Copyright (c) 2010-2012, 2015, 2017, 2018, 2020 ARM Limited
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* 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) 2002-2005 The Regents of The University of Michigan
* All rights reserved.
*
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* 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
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*/
#include "cpu/simple/base.hh"
#include "arch/generic/decoder.hh"
#include "base/cprintf.hh"
#include "base/inifile.hh"
#include "base/loader/symtab.hh"
#include "base/logging.hh"
#include "base/pollevent.hh"
#include "base/trace.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/checker/cpu.hh"
#include "cpu/checker/thread_context.hh"
#include "cpu/exetrace.hh"
#include "cpu/null_static_inst.hh"
#include "cpu/pred/bpred_unit.hh"
#include "cpu/simple/exec_context.hh"
#include "cpu/simple_thread.hh"
#include "cpu/smt.hh"
#include "cpu/static_inst.hh"
#include "cpu/thread_context.hh"
#include "debug/Decode.hh"
#include "debug/ExecFaulting.hh"
#include "debug/Fetch.hh"
#include "debug/HtmCpu.hh"
#include "debug/Quiesce.hh"
#include "mem/packet.hh"
#include "mem/request.hh"
#include "params/BaseSimpleCPU.hh"
#include "sim/byteswap.hh"
#include "sim/debug.hh"
#include "sim/faults.hh"
#include "sim/full_system.hh"
#include "sim/sim_events.hh"
#include "sim/sim_object.hh"
#include "sim/stats.hh"
#include "sim/system.hh"
namespace gem5
{
BaseSimpleCPU::BaseSimpleCPU(const BaseSimpleCPUParams &p)
: BaseCPU(p),
curThread(0),
branchPred(p.branchPred),
zeroReg(p.isa[0]->regClasses().at(IntRegClass).zeroReg()),
traceData(NULL),
_status(Idle)
{
SimpleThread *thread;
for (unsigned i = 0; i < numThreads; i++) {
if (FullSystem) {
thread = new SimpleThread(
this, i, p.system, p.mmu, p.isa[i], p.decoder[i]);
} else {
thread = new SimpleThread(
this, i, p.system, p.workload[i], p.mmu, p.isa[i],
p.decoder[i]);
}
threadInfo.push_back(new SimpleExecContext(this, thread));
ThreadContext *tc = thread->getTC();
threadContexts.push_back(tc);
}
if (p.checker) {
if (numThreads != 1)
fatal("Checker currently does not support SMT");
BaseCPU *temp_checker = p.checker;
checker = dynamic_cast<CheckerCPU *>(temp_checker);
checker->setSystem(p.system);
// Manipulate thread context
ThreadContext *cpu_tc = threadContexts[0];
threadContexts[0] = new CheckerThreadContext<ThreadContext>(
cpu_tc, this->checker);
} else {
checker = NULL;
}
}
void
BaseSimpleCPU::checkPcEventQueue()
{
Addr oldpc, pc = threadInfo[curThread]->thread->pcState().instAddr();
do {
oldpc = pc;
threadInfo[curThread]->thread->pcEventQueue.service(
oldpc, threadContexts[curThread]);
pc = threadInfo[curThread]->thread->pcState().instAddr();
} while (oldpc != pc);
}
void
BaseSimpleCPU::swapActiveThread()
{
if (numThreads > 1) {
if ((!curStaticInst || !curStaticInst->isDelayedCommit()) &&
!threadInfo[curThread]->stayAtPC) {
// Swap active threads
if (!activeThreads.empty()) {
curThread = activeThreads.front();
activeThreads.pop_front();
activeThreads.push_back(curThread);
}
}
}
}
void
BaseSimpleCPU::countInst()
{
SimpleExecContext& t_info = *threadInfo[curThread];
if (!curStaticInst->isMicroop() || curStaticInst->isLastMicroop()) {
t_info.numInst++;
t_info.execContextStats.numInsts++;
}
t_info.numOp++;
t_info.execContextStats.numOps++;
}
Counter
BaseSimpleCPU::totalInsts() const
{
Counter total_inst = 0;
for (auto& t_info : threadInfo) {
total_inst += t_info->numInst;
}
return total_inst;
}
Counter
BaseSimpleCPU::totalOps() const
{
Counter total_op = 0;
for (auto& t_info : threadInfo) {
total_op += t_info->numOp;
}
return total_op;
}
BaseSimpleCPU::~BaseSimpleCPU()
{
}
void
BaseSimpleCPU::haltContext(ThreadID thread_num)
{
// for now, these are equivalent
suspendContext(thread_num);
updateCycleCounters(BaseCPU::CPU_STATE_SLEEP);
}
void
BaseSimpleCPU::resetStats()
{
BaseCPU::resetStats();
for (auto &thread_info : threadInfo) {
thread_info->execContextStats.notIdleFraction = (_status != Idle);
}
}
void
BaseSimpleCPU::serializeThread(CheckpointOut &cp, ThreadID tid) const
{
assert(_status == Idle || _status == Running);
threadInfo[tid]->thread->serialize(cp);
}
void
BaseSimpleCPU::unserializeThread(CheckpointIn &cp, ThreadID tid)
{
threadInfo[tid]->thread->unserialize(cp);
}
void
change_thread_state(ThreadID tid, int activate, int priority)
{
}
void
BaseSimpleCPU::wakeup(ThreadID tid)
{
getCpuAddrMonitor(tid)->gotWakeup = true;
if (threadInfo[tid]->thread->status() == ThreadContext::Suspended) {
DPRINTF(Quiesce,"[tid:%d] Suspended Processor awoke\n", tid);
threadInfo[tid]->thread->activate();
}
}
void
BaseSimpleCPU::traceFault()
{
if (debug::ExecFaulting) {
traceData->setFaulting(true);
} else {
delete traceData;
traceData = NULL;
}
}
void
BaseSimpleCPU::checkForInterrupts()
{
SimpleExecContext&t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
ThreadContext* tc = thread->getTC();
if (checkInterrupts(curThread)) {
Fault interrupt = interrupts[curThread]->getInterrupt();
if (interrupt != NoFault) {
// hardware transactional memory
// Postpone taking interrupts while executing transactions.
assert(!std::dynamic_pointer_cast<GenericHtmFailureFault>(
interrupt));
if (t_info.inHtmTransactionalState()) {
DPRINTF(HtmCpu, "Deferring pending interrupt - %s -"
"due to transactional state\n",
interrupt->name());
return;
}
t_info.fetchOffset = 0;
interrupts[curThread]->updateIntrInfo();
interrupt->invoke(tc);
thread->decoder->reset();
}
}
}
void
BaseSimpleCPU::setupFetchRequest(const RequestPtr &req)
{
SimpleExecContext &t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
auto &decoder = thread->decoder;
Addr instAddr = thread->pcState().instAddr();
Addr fetchPC = (instAddr & decoder->pcMask()) + t_info.fetchOffset;
// set up memory request for instruction fetch
DPRINTF(Fetch, "Fetch: Inst PC:%08p, Fetch PC:%08p\n", instAddr, fetchPC);
req->setVirt(fetchPC, decoder->moreBytesSize(), Request::INST_FETCH,
instRequestorId(), instAddr);
}
void
BaseSimpleCPU::serviceInstCountEvents()
{
SimpleExecContext &t_info = *threadInfo[curThread];
t_info.thread->comInstEventQueue.serviceEvents(t_info.numInst);
}
void
BaseSimpleCPU::preExecute()
{
SimpleExecContext &t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
// resets predicates
t_info.setPredicate(true);
t_info.setMemAccPredicate(true);
// decode the instruction
set(preExecuteTempPC, thread->pcState());
auto &pc_state = *preExecuteTempPC;
auto &decoder = thread->decoder;
if (isRomMicroPC(pc_state.microPC())) {
t_info.stayAtPC = false;
curStaticInst = decoder->fetchRomMicroop(
pc_state.microPC(), curMacroStaticInst);
} else if (!curMacroStaticInst) {
//We're not in the middle of a macro instruction
StaticInstPtr instPtr = NULL;
//Predecode, ie bundle up an ExtMachInst
//If more fetch data is needed, pass it in.
Addr fetch_pc =
(pc_state.instAddr() & decoder->pcMask()) + t_info.fetchOffset;
decoder->moreBytes(pc_state, fetch_pc);
//Decode an instruction if one is ready. Otherwise, we'll have to
//fetch beyond the MachInst at the current pc.
instPtr = decoder->decode(pc_state);
if (instPtr) {
t_info.stayAtPC = false;
thread->pcState(pc_state);
} else {
t_info.stayAtPC = true;
t_info.fetchOffset += decoder->moreBytesSize();
}
//If we decoded an instruction and it's microcoded, start pulling
//out micro ops
if (instPtr && instPtr->isMacroop()) {
curMacroStaticInst = instPtr;
curStaticInst =
curMacroStaticInst->fetchMicroop(pc_state.microPC());
} else {
curStaticInst = instPtr;
}
} else {
//Read the next micro op from the macro op
curStaticInst = curMacroStaticInst->fetchMicroop(pc_state.microPC());
}
//If we decoded an instruction this "tick", record information about it.
if (curStaticInst) {
#if TRACING_ON
traceData = tracer->getInstRecord(curTick(), thread->getTC(),
curStaticInst, thread->pcState(), curMacroStaticInst);
#endif // TRACING_ON
}
if (branchPred && curStaticInst &&
curStaticInst->isControl()) {
// Use a fake sequence number since we only have one
// instruction in flight at the same time.
const InstSeqNum cur_sn(0);
set(t_info.predPC, thread->pcState());
const bool predict_taken(
branchPred->predict(curStaticInst, cur_sn, *t_info.predPC,
curThread));
if (predict_taken)
++t_info.execContextStats.numPredictedBranches;
}
}
void
BaseSimpleCPU::postExecute()
{
SimpleExecContext &t_info = *threadInfo[curThread];
assert(curStaticInst);
Addr instAddr = threadContexts[curThread]->pcState().instAddr();
if (curStaticInst->isMemRef()) {
t_info.execContextStats.numMemRefs++;
}
if (curStaticInst->isLoad()) {
++t_info.numLoad;
}
if (curStaticInst->isControl()) {
++t_info.execContextStats.numBranches;
}
/* Power model statistics */
//integer alu accesses
if (curStaticInst->isInteger()){
t_info.execContextStats.numIntAluAccesses++;
t_info.execContextStats.numIntInsts++;
}
//float alu accesses
if (curStaticInst->isFloating()){
t_info.execContextStats.numFpAluAccesses++;
t_info.execContextStats.numFpInsts++;
}
//vector alu accesses
if (curStaticInst->isVector()){
t_info.execContextStats.numVecAluAccesses++;
t_info.execContextStats.numVecInsts++;
}
//number of function calls/returns to get window accesses
if (curStaticInst->isCall() || curStaticInst->isReturn()){
t_info.execContextStats.numCallsReturns++;
}
//the number of branch predictions that will be made
if (curStaticInst->isCondCtrl()){
t_info.execContextStats.numCondCtrlInsts++;
}
//result bus acceses
if (curStaticInst->isLoad()){
t_info.execContextStats.numLoadInsts++;
}
if (curStaticInst->isStore() || curStaticInst->isAtomic()){
t_info.execContextStats.numStoreInsts++;
}
/* End power model statistics */
t_info.execContextStats.statExecutedInstType[curStaticInst->opClass()]++;
if (FullSystem)
traceFunctions(instAddr);
if (traceData) {
traceData->dump();
delete traceData;
traceData = NULL;
}
// Call CPU instruction commit probes
probeInstCommit(curStaticInst, instAddr);
}
void
BaseSimpleCPU::advancePC(const Fault &fault)
{
SimpleExecContext &t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
const bool branching = thread->pcState().branching();
//Since we're moving to a new pc, zero out the offset
t_info.fetchOffset = 0;
if (fault != NoFault) {
curMacroStaticInst = nullStaticInstPtr;
fault->invoke(threadContexts[curThread], curStaticInst);
thread->decoder->reset();
} else {
if (curStaticInst) {
if (curStaticInst->isLastMicroop())
curMacroStaticInst = nullStaticInstPtr;
curStaticInst->advancePC(thread);
}
}
if (branchPred && curStaticInst && curStaticInst->isControl()) {
// Use a fake sequence number since we only have one
// instruction in flight at the same time.
const InstSeqNum cur_sn(0);
if (*t_info.predPC == thread->pcState()) {
// Correctly predicted branch
branchPred->update(cur_sn, curThread);
} else {
// Mis-predicted branch
branchPred->squash(cur_sn, thread->pcState(), branching,
curThread);
++t_info.execContextStats.numBranchMispred;
}
}
}
} // namespace gem5