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/*
* Copyright (c) 2010-2012, 2015, 2017 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.
*
* 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: Steve Reinhardt
*/
#include "cpu/simple/base.hh"
#include "arch/kernel_stats.hh"
#include "arch/stacktrace.hh"
#include "arch/utility.hh"
#include "arch/vtophys.hh"
#include "base/cp_annotate.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/pred/bpred_unit.hh"
#include "cpu/profile.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/Fetch.hh"
#include "debug/Quiesce.hh"
#include "mem/mem_object.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"
using namespace std;
using namespace TheISA;
BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
: BaseCPU(p),
curThread(0),
branchPred(p->branchPred),
traceData(NULL),
inst(),
_status(Idle)
{
SimpleThread *thread;
for (unsigned i = 0; i < numThreads; i++) {
if (FullSystem) {
thread = new SimpleThread(this, i, p->system,
p->itb, p->dtb, p->isa[i]);
} else {
thread = new SimpleThread(this, i, p->system, p->workload[i],
p->itb, p->dtb, p->isa[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::init()
{
BaseCPU::init();
for (auto tc : threadContexts) {
// Initialise the ThreadContext's memory proxies
tc->initMemProxies(tc);
if (FullSystem && !params()->switched_out) {
// initialize CPU, including PC
TheISA::initCPU(tc, tc->contextId());
}
}
}
void
BaseSimpleCPU::checkPcEventQueue()
{
Addr oldpc, pc = threadInfo[curThread]->thread->instAddr();
do {
oldpc = pc;
system->pcEventQueue.service(threadContexts[curThread]);
pc = threadInfo[curThread]->thread->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.numInsts++;
}
t_info.numOp++;
t_info.numOps++;
system->totalNumInsts++;
t_info.thread->funcExeInst++;
}
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::regStats()
{
using namespace Stats;
BaseCPU::regStats();
for (ThreadID tid = 0; tid < numThreads; tid++) {
SimpleExecContext& t_info = *threadInfo[tid];
std::string thread_str = name();
if (numThreads > 1)
thread_str += ".thread" + std::to_string(tid);
t_info.numInsts
.name(thread_str + ".committedInsts")
.desc("Number of instructions committed")
;
t_info.numOps
.name(thread_str + ".committedOps")
.desc("Number of ops (including micro ops) committed")
;
t_info.numIntAluAccesses
.name(thread_str + ".num_int_alu_accesses")
.desc("Number of integer alu accesses")
;
t_info.numFpAluAccesses
.name(thread_str + ".num_fp_alu_accesses")
.desc("Number of float alu accesses")
;
t_info.numVecAluAccesses
.name(thread_str + ".num_vec_alu_accesses")
.desc("Number of vector alu accesses")
;
t_info.numCallsReturns
.name(thread_str + ".num_func_calls")
.desc("number of times a function call or return occured")
;
t_info.numCondCtrlInsts
.name(thread_str + ".num_conditional_control_insts")
.desc("number of instructions that are conditional controls")
;
t_info.numIntInsts
.name(thread_str + ".num_int_insts")
.desc("number of integer instructions")
;
t_info.numFpInsts
.name(thread_str + ".num_fp_insts")
.desc("number of float instructions")
;
t_info.numVecInsts
.name(thread_str + ".num_vec_insts")
.desc("number of vector instructions")
;
t_info.numIntRegReads
.name(thread_str + ".num_int_register_reads")
.desc("number of times the integer registers were read")
;
t_info.numIntRegWrites
.name(thread_str + ".num_int_register_writes")
.desc("number of times the integer registers were written")
;
t_info.numFpRegReads
.name(thread_str + ".num_fp_register_reads")
.desc("number of times the floating registers were read")
;
t_info.numFpRegWrites
.name(thread_str + ".num_fp_register_writes")
.desc("number of times the floating registers were written")
;
t_info.numVecRegReads
.name(thread_str + ".num_vec_register_reads")
.desc("number of times the vector registers were read")
;
t_info.numVecRegWrites
.name(thread_str + ".num_vec_register_writes")
.desc("number of times the vector registers were written")
;
t_info.numCCRegReads
.name(thread_str + ".num_cc_register_reads")
.desc("number of times the CC registers were read")
.flags(nozero)
;
t_info.numCCRegWrites
.name(thread_str + ".num_cc_register_writes")
.desc("number of times the CC registers were written")
.flags(nozero)
;
t_info.numMemRefs
.name(thread_str + ".num_mem_refs")
.desc("number of memory refs")
;
t_info.numStoreInsts
.name(thread_str + ".num_store_insts")
.desc("Number of store instructions")
;
t_info.numLoadInsts
.name(thread_str + ".num_load_insts")
.desc("Number of load instructions")
;
t_info.notIdleFraction
.name(thread_str + ".not_idle_fraction")
.desc("Percentage of non-idle cycles")
;
t_info.idleFraction
.name(thread_str + ".idle_fraction")
.desc("Percentage of idle cycles")
;
t_info.numBusyCycles
.name(thread_str + ".num_busy_cycles")
.desc("Number of busy cycles")
;
t_info.numIdleCycles
.name(thread_str + ".num_idle_cycles")
.desc("Number of idle cycles")
;
t_info.icacheStallCycles
.name(thread_str + ".icache_stall_cycles")
.desc("ICache total stall cycles")
.prereq(t_info.icacheStallCycles)
;
t_info.dcacheStallCycles
.name(thread_str + ".dcache_stall_cycles")
.desc("DCache total stall cycles")
.prereq(t_info.dcacheStallCycles)
;
t_info.statExecutedInstType
.init(Enums::Num_OpClass)
.name(thread_str + ".op_class")
.desc("Class of executed instruction")
.flags(total | pdf | dist)
;
for (unsigned i = 0; i < Num_OpClasses; ++i) {
t_info.statExecutedInstType.subname(i, Enums::OpClassStrings[i]);
}
t_info.idleFraction = constant(1.0) - t_info.notIdleFraction;
t_info.numIdleCycles = t_info.idleFraction * numCycles;
t_info.numBusyCycles = t_info.notIdleFraction * numCycles;
t_info.numBranches
.name(thread_str + ".Branches")
.desc("Number of branches fetched")
.prereq(t_info.numBranches);
t_info.numPredictedBranches
.name(thread_str + ".predictedBranches")
.desc("Number of branches predicted as taken")
.prereq(t_info.numPredictedBranches);
t_info.numBranchMispred
.name(thread_str + ".BranchMispred")
.desc("Number of branch mispredictions")
.prereq(t_info.numBranchMispred);
}
}
void
BaseSimpleCPU::resetStats()
{
for (auto &thread_info : threadInfo) {
thread_info->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)
{
}
Addr
BaseSimpleCPU::dbg_vtophys(Addr addr)
{
return vtophys(threadContexts[curThread], addr);
}
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::checkForInterrupts()
{
SimpleExecContext&t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
ThreadContext* tc = thread->getTC();
if (checkInterrupts(tc)) {
Fault interrupt = interrupts[curThread]->getInterrupt(tc);
if (interrupt != NoFault) {
t_info.fetchOffset = 0;
interrupts[curThread]->updateIntrInfo(tc);
interrupt->invoke(tc);
thread->decoder.reset();
}
}
}
void
BaseSimpleCPU::setupFetchRequest(const RequestPtr &req)
{
SimpleExecContext &t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
Addr instAddr = thread->instAddr();
Addr fetchPC = (instAddr & 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(0, fetchPC, sizeof(MachInst), Request::INST_FETCH,
instMasterId(), instAddr);
}
void
BaseSimpleCPU::preExecute()
{
SimpleExecContext &t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
// maintain $r0 semantics
thread->setIntReg(ZeroReg, 0);
#if THE_ISA == ALPHA_ISA
thread->setFloatReg(ZeroReg, 0);
#endif // ALPHA_ISA
// check for instruction-count-based events
comInstEventQueue[curThread]->serviceEvents(t_info.numInst);
system->instEventQueue.serviceEvents(system->totalNumInsts);
// decode the instruction
inst = gtoh(inst);
TheISA::PCState pcState = thread->pcState();
if (isRomMicroPC(pcState.microPC())) {
t_info.stayAtPC = false;
curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(),
curMacroStaticInst);
} else if (!curMacroStaticInst) {
//We're not in the middle of a macro instruction
StaticInstPtr instPtr = NULL;
TheISA::Decoder *decoder = &(thread->decoder);
//Predecode, ie bundle up an ExtMachInst
//If more fetch data is needed, pass it in.
Addr fetchPC = (pcState.instAddr() & PCMask) + t_info.fetchOffset;
//if (decoder->needMoreBytes())
decoder->moreBytes(pcState, fetchPC, inst);
//else
// decoder->process();
//Decode an instruction if one is ready. Otherwise, we'll have to
//fetch beyond the MachInst at the current pc.
instPtr = decoder->decode(pcState);
if (instPtr) {
t_info.stayAtPC = false;
thread->pcState(pcState);
} else {
t_info.stayAtPC = true;
t_info.fetchOffset += sizeof(MachInst);
}
//If we decoded an instruction and it's microcoded, start pulling
//out micro ops
if (instPtr && instPtr->isMacroop()) {
curMacroStaticInst = instPtr;
curStaticInst =
curMacroStaticInst->fetchMicroop(pcState.microPC());
} else {
curStaticInst = instPtr;
}
} else {
//Read the next micro op from the macro op
curStaticInst = curMacroStaticInst->fetchMicroop(pcState.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);
DPRINTF(Decode,"Decode: Decoded %s instruction: %#x\n",
curStaticInst->getName(), curStaticInst->machInst);
#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);
t_info.predPC = thread->pcState();
const bool predict_taken(
branchPred->predict(curStaticInst, cur_sn, t_info.predPC,
curThread));
if (predict_taken)
++t_info.numPredictedBranches;
}
}
void
BaseSimpleCPU::postExecute()
{
SimpleExecContext &t_info = *threadInfo[curThread];
SimpleThread* thread = t_info.thread;
assert(curStaticInst);
TheISA::PCState pc = threadContexts[curThread]->pcState();
Addr instAddr = pc.instAddr();
if (FullSystem && thread->profile) {
bool usermode = TheISA::inUserMode(threadContexts[curThread]);
thread->profilePC = usermode ? 1 : instAddr;
ProfileNode *node = thread->profile->consume(threadContexts[curThread],
curStaticInst);
if (node)
thread->profileNode = node;
}
if (curStaticInst->isMemRef()) {
t_info.numMemRefs++;
}
if (curStaticInst->isLoad()) {
++t_info.numLoad;
comLoadEventQueue[curThread]->serviceEvents(t_info.numLoad);
}
if (CPA::available()) {
CPA::cpa()->swAutoBegin(threadContexts[curThread], pc.nextInstAddr());
}
if (curStaticInst->isControl()) {
++t_info.numBranches;
}
/* Power model statistics */
//integer alu accesses
if (curStaticInst->isInteger()){
t_info.numIntAluAccesses++;
t_info.numIntInsts++;
}
//float alu accesses
if (curStaticInst->isFloating()){
t_info.numFpAluAccesses++;
t_info.numFpInsts++;
}
//vector alu accesses
if (curStaticInst->isVector()){
t_info.numVecAluAccesses++;
t_info.numVecInsts++;
}
//number of function calls/returns to get window accesses
if (curStaticInst->isCall() || curStaticInst->isReturn()){
t_info.numCallsReturns++;
}
//the number of branch predictions that will be made
if (curStaticInst->isCondCtrl()){
t_info.numCondCtrlInsts++;
}
//result bus acceses
if (curStaticInst->isLoad()){
t_info.numLoadInsts++;
}
if (curStaticInst->isStore() || curStaticInst->isAtomic()){
t_info.numStoreInsts++;
}
/* End power model statistics */
t_info.statExecutedInstType[curStaticInst->opClass()]++;
if (FullSystem)
traceFunctions(instAddr);
if (traceData) {
traceData->dump();
delete traceData;
traceData = NULL;
}
// Call CPU instruction commit probes
probeInstCommit(curStaticInst);
}
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 = StaticInst::nullStaticInstPtr;
fault->invoke(threadContexts[curThread], curStaticInst);
thread->decoder.reset();
} else {
if (curStaticInst) {
if (curStaticInst->isLastMicroop())
curMacroStaticInst = StaticInst::nullStaticInstPtr;
TheISA::PCState pcState = thread->pcState();
TheISA::advancePC(pcState, curStaticInst);
thread->pcState(pcState);
}
}
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.numBranchMispred;
}
}
}
void
BaseSimpleCPU::startup()
{
BaseCPU::startup();
for (auto& t_info : threadInfo)
t_info->thread->startup();
}