60#include "cpu/cpuevent.hh"
61#include "cpu/profile.hh"
62#include "cpu/thread_context.hh"
63#include "debug/Mwait.hh"
64#include "debug/SyscallVerbose.hh"
65#include "mem/page_table.hh"
66#include "params/BaseCPU.hh"
67#include "sim/clocked_object.hh"
68#include "sim/full_system.hh"
69#include "sim/process.hh"
70#include "sim/sim_events.hh"
71#include "sim/sim_exit.hh"
72#include "sim/system.hh"
73
74// Hack
75#include "sim/stat_control.hh"
76
77using namespace std;
78
79vector<BaseCPU *> BaseCPU::cpuList;
80
81// This variable reflects the max number of threads in any CPU. Be
82// careful to only use it once all the CPUs that you care about have
83// been initialized
84int maxThreadsPerCPU = 1;
85
86CPUProgressEvent::CPUProgressEvent(BaseCPU *_cpu, Tick ival)
87 : Event(Event::Progress_Event_Pri), _interval(ival), lastNumInst(0),
88 cpu(_cpu), _repeatEvent(true)
89{
90 if (_interval)
91 cpu->schedule(this, curTick() + _interval);
92}
93
94void
95CPUProgressEvent::process()
96{
97 Counter temp = cpu->totalOps();
98
99 if (_repeatEvent)
100 cpu->schedule(this, curTick() + _interval);
101
102 if (cpu->switchedOut()) {
103 return;
104 }
105
106#ifndef NDEBUG
107 double ipc = double(temp - lastNumInst) / (_interval / cpu->clockPeriod());
108
109 DPRINTFN("%s progress event, total committed:%i, progress insts committed: "
110 "%lli, IPC: %0.8d\n", cpu->name(), temp, temp - lastNumInst,
111 ipc);
112 ipc = 0.0;
113#else
114 cprintf("%lli: %s progress event, total committed:%i, progress insts "
115 "committed: %lli\n", curTick(), cpu->name(), temp,
116 temp - lastNumInst);
117#endif
118 lastNumInst = temp;
119}
120
121const char *
122CPUProgressEvent::description() const
123{
124 return "CPU Progress";
125}
126
127BaseCPU::BaseCPU(Params *p, bool is_checker)
128 : MemObject(p), instCnt(0), _cpuId(p->cpu_id), _socketId(p->socket_id),
129 _instMasterId(p->system->getMasterId(name() + ".inst")),
130 _dataMasterId(p->system->getMasterId(name() + ".data")),
131 _taskId(ContextSwitchTaskId::Unknown), _pid(invldPid),
132 _switchedOut(p->switched_out), _cacheLineSize(p->system->cacheLineSize()),
133 interrupts(p->interrupts), profileEvent(NULL),
134 numThreads(p->numThreads), system(p->system),
135 functionTraceStream(nullptr), currentFunctionStart(0),
136 currentFunctionEnd(0), functionEntryTick(0),
137 addressMonitor(p->numThreads)
138{
139 // if Python did not provide a valid ID, do it here
140 if (_cpuId == -1 ) {
141 _cpuId = cpuList.size();
142 }
143
144 // add self to global list of CPUs
145 cpuList.push_back(this);
146
147 DPRINTF(SyscallVerbose, "Constructing CPU with id %d, socket id %d\n",
148 _cpuId, _socketId);
149
150 if (numThreads > maxThreadsPerCPU)
151 maxThreadsPerCPU = numThreads;
152
153 // allocate per-thread instruction-based event queues
154 comInstEventQueue = new EventQueue *[numThreads];
155 for (ThreadID tid = 0; tid < numThreads; ++tid)
156 comInstEventQueue[tid] =
157 new EventQueue("instruction-based event queue");
158
159 //
160 // set up instruction-count-based termination events, if any
161 //
162 if (p->max_insts_any_thread != 0) {
163 const char *cause = "a thread reached the max instruction count";
164 for (ThreadID tid = 0; tid < numThreads; ++tid)
165 scheduleInstStop(tid, p->max_insts_any_thread, cause);
166 }
167
168 // Set up instruction-count-based termination events for SimPoints
169 // Typically, there are more than one action points.
170 // Simulation.py is responsible to take the necessary actions upon
171 // exitting the simulation loop.
172 if (!p->simpoint_start_insts.empty()) {
173 const char *cause = "simpoint starting point found";
174 for (size_t i = 0; i < p->simpoint_start_insts.size(); ++i)
175 scheduleInstStop(0, p->simpoint_start_insts[i], cause);
176 }
177
178 if (p->max_insts_all_threads != 0) {
179 const char *cause = "all threads reached the max instruction count";
180
181 // allocate & initialize shared downcounter: each event will
182 // decrement this when triggered; simulation will terminate
183 // when counter reaches 0
184 int *counter = new int;
185 *counter = numThreads;
186 for (ThreadID tid = 0; tid < numThreads; ++tid) {
187 Event *event = new CountedExitEvent(cause, *counter);
188 comInstEventQueue[tid]->schedule(event, p->max_insts_all_threads);
189 }
190 }
191
192 // allocate per-thread load-based event queues
193 comLoadEventQueue = new EventQueue *[numThreads];
194 for (ThreadID tid = 0; tid < numThreads; ++tid)
195 comLoadEventQueue[tid] = new EventQueue("load-based event queue");
196
197 //
198 // set up instruction-count-based termination events, if any
199 //
200 if (p->max_loads_any_thread != 0) {
201 const char *cause = "a thread reached the max load count";
202 for (ThreadID tid = 0; tid < numThreads; ++tid)
203 scheduleLoadStop(tid, p->max_loads_any_thread, cause);
204 }
205
206 if (p->max_loads_all_threads != 0) {
207 const char *cause = "all threads reached the max load count";
208 // allocate & initialize shared downcounter: each event will
209 // decrement this when triggered; simulation will terminate
210 // when counter reaches 0
211 int *counter = new int;
212 *counter = numThreads;
213 for (ThreadID tid = 0; tid < numThreads; ++tid) {
214 Event *event = new CountedExitEvent(cause, *counter);
215 comLoadEventQueue[tid]->schedule(event, p->max_loads_all_threads);
216 }
217 }
218
219 functionTracingEnabled = false;
220 if (p->function_trace) {
221 const string fname = csprintf("ftrace.%s", name());
222 functionTraceStream = simout.findOrCreate(fname)->stream();
223
224 currentFunctionStart = currentFunctionEnd = 0;
225 functionEntryTick = p->function_trace_start;
226
227 if (p->function_trace_start == 0) {
228 functionTracingEnabled = true;
229 } else {
230 typedef EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace> wrap;
231 Event *event = new wrap(this, true);
232 schedule(event, p->function_trace_start);
233 }
234 }
235
236 // The interrupts should always be present unless this CPU is
237 // switched in later or in case it is a checker CPU
238 if (!params()->switched_out && !is_checker) {
239 fatal_if(interrupts.size() != numThreads,
240 "CPU %s has %i interrupt controllers, but is expecting one "
241 "per thread (%i)\n",
242 name(), interrupts.size(), numThreads);
243 for (ThreadID tid = 0; tid < numThreads; tid++)
244 interrupts[tid]->setCPU(this);
245 }
246
247 if (FullSystem) {
248 if (params()->profile)
249 profileEvent = new ProfileEvent(this, params()->profile);
250 }
251 tracer = params()->tracer;
252
253 if (params()->isa.size() != numThreads) {
254 fatal("Number of ISAs (%i) assigned to the CPU does not equal number "
255 "of threads (%i).\n", params()->isa.size(), numThreads);
256 }
257}
258
259void
260BaseCPU::enableFunctionTrace()
261{
262 functionTracingEnabled = true;
263}
264
265BaseCPU::~BaseCPU()
266{
267 delete profileEvent;
268 delete[] comLoadEventQueue;
269 delete[] comInstEventQueue;
270}
271
272void
273BaseCPU::armMonitor(ThreadID tid, Addr address)
274{
275 assert(tid < numThreads);
276 AddressMonitor &monitor = addressMonitor[tid];
277
278 monitor.armed = true;
279 monitor.vAddr = address;
280 monitor.pAddr = 0x0;
281 DPRINTF(Mwait,"[tid:%d] Armed monitor (vAddr=0x%lx)\n", tid, address);
282}
283
284bool
285BaseCPU::mwait(ThreadID tid, PacketPtr pkt)
286{
287 assert(tid < numThreads);
288 AddressMonitor &monitor = addressMonitor[tid];
289
290 if (!monitor.gotWakeup) {
291 int block_size = cacheLineSize();
292 uint64_t mask = ~((uint64_t)(block_size - 1));
293
294 assert(pkt->req->hasPaddr());
295 monitor.pAddr = pkt->getAddr() & mask;
296 monitor.waiting = true;
297
298 DPRINTF(Mwait,"[tid:%d] mwait called (vAddr=0x%lx, "
299 "line's paddr=0x%lx)\n", tid, monitor.vAddr, monitor.pAddr);
300 return true;
301 } else {
302 monitor.gotWakeup = false;
303 return false;
304 }
305}
306
307void
308BaseCPU::mwaitAtomic(ThreadID tid, ThreadContext *tc, TheISA::TLB *dtb)
309{
310 assert(tid < numThreads);
311 AddressMonitor &monitor = addressMonitor[tid];
312
313 Request req;
314 Addr addr = monitor.vAddr;
315 int block_size = cacheLineSize();
316 uint64_t mask = ~((uint64_t)(block_size - 1));
317 int size = block_size;
318
319 //The address of the next line if it crosses a cache line boundary.
320 Addr secondAddr = roundDown(addr + size - 1, block_size);
321
322 if (secondAddr > addr)
323 size = secondAddr - addr;
324
325 req.setVirt(0, addr, size, 0x0, dataMasterId(), tc->instAddr());
326
327 // translate to physical address
328 Fault fault = dtb->translateAtomic(&req, tc, BaseTLB::Read);
329 assert(fault == NoFault);
330
331 monitor.pAddr = req.getPaddr() & mask;
332 monitor.waiting = true;
333
334 DPRINTF(Mwait,"[tid:%d] mwait called (vAddr=0x%lx, line's paddr=0x%lx)\n",
335 tid, monitor.vAddr, monitor.pAddr);
336}
337
338void
339BaseCPU::init()
340{
341 if (!params()->switched_out) {
342 registerThreadContexts();
343
344 verifyMemoryMode();
345 }
346}
347
348void
349BaseCPU::startup()
350{
351 if (FullSystem) {
352 if (!params()->switched_out && profileEvent)
353 schedule(profileEvent, curTick());
354 }
355
356 if (params()->progress_interval) {
357 new CPUProgressEvent(this, params()->progress_interval);
358 }
359
360 // Assumption CPU start to operate instantaneously without any latency
361 if (ClockedObject::pwrState() == Enums::PwrState::UNDEFINED)
362 ClockedObject::pwrState(Enums::PwrState::ON);
363
364}
365
366ProbePoints::PMUUPtr
367BaseCPU::pmuProbePoint(const char *name)
368{
369 ProbePoints::PMUUPtr ptr;
370 ptr.reset(new ProbePoints::PMU(getProbeManager(), name));
371
372 return ptr;
373}
374
375void
376BaseCPU::regProbePoints()
377{
378 ppCycles = pmuProbePoint("Cycles");
379
380 ppRetiredInsts = pmuProbePoint("RetiredInsts");
381 ppRetiredLoads = pmuProbePoint("RetiredLoads");
382 ppRetiredStores = pmuProbePoint("RetiredStores");
383 ppRetiredBranches = pmuProbePoint("RetiredBranches");
384}
385
386void
387BaseCPU::probeInstCommit(const StaticInstPtr &inst)
388{
389 if (!inst->isMicroop() || inst->isLastMicroop())
390 ppRetiredInsts->notify(1);
391
392
393 if (inst->isLoad())
394 ppRetiredLoads->notify(1);
395
396 if (inst->isStore())
397 ppRetiredStores->notify(1);
398
399 if (inst->isControl())
400 ppRetiredBranches->notify(1);
401}
402
403void
404BaseCPU::regStats()
405{
406 MemObject::regStats();
407
408 using namespace Stats;
409
410 numCycles
411 .name(name() + ".numCycles")
412 .desc("number of cpu cycles simulated")
413 ;
414
415 numWorkItemsStarted
416 .name(name() + ".numWorkItemsStarted")
417 .desc("number of work items this cpu started")
418 ;
419
420 numWorkItemsCompleted
421 .name(name() + ".numWorkItemsCompleted")
422 .desc("number of work items this cpu completed")
423 ;
424
425 int size = threadContexts.size();
426 if (size > 1) {
427 for (int i = 0; i < size; ++i) {
428 stringstream namestr;
429 ccprintf(namestr, "%s.ctx%d", name(), i);
430 threadContexts[i]->regStats(namestr.str());
431 }
432 } else if (size == 1)
433 threadContexts[0]->regStats(name());
434}
435
436BaseMasterPort &
437BaseCPU::getMasterPort(const string &if_name, PortID idx)
438{
439 // Get the right port based on name. This applies to all the
440 // subclasses of the base CPU and relies on their implementation
441 // of getDataPort and getInstPort. In all cases there methods
442 // return a MasterPort pointer.
443 if (if_name == "dcache_port")
444 return getDataPort();
445 else if (if_name == "icache_port")
446 return getInstPort();
447 else
448 return MemObject::getMasterPort(if_name, idx);
449}
450
451void
452BaseCPU::registerThreadContexts()
453{
454 assert(system->multiThread || numThreads == 1);
455
456 ThreadID size = threadContexts.size();
457 for (ThreadID tid = 0; tid < size; ++tid) {
458 ThreadContext *tc = threadContexts[tid];
459
460 if (system->multiThread) {
461 tc->setContextId(system->registerThreadContext(tc));
462 } else {
463 tc->setContextId(system->registerThreadContext(tc, _cpuId));
464 }
465
466 if (!FullSystem)
467 tc->getProcessPtr()->assignThreadContext(tc->contextId());
468 }
469}
470
471
472int
473BaseCPU::findContext(ThreadContext *tc)
474{
475 ThreadID size = threadContexts.size();
476 for (ThreadID tid = 0; tid < size; ++tid) {
477 if (tc == threadContexts[tid])
478 return tid;
479 }
480 return 0;
481}
482
483void
484BaseCPU::activateContext(ThreadID thread_num)
485{
486 // For any active thread running, update CPU power state to active (ON)
487 ClockedObject::pwrState(Enums::PwrState::ON);
488}
489
490void
491BaseCPU::suspendContext(ThreadID thread_num)
492{
493 // Check if all threads are suspended
494 for (auto t : threadContexts) {
495 if (t->status() != ThreadContext::Suspended) {
496 return;
497 }
498 }
499
500 // All CPU threads suspended, enter lower power state for the CPU
501 ClockedObject::pwrState(Enums::PwrState::CLK_GATED);
502}
503
504void
505BaseCPU::switchOut()
506{
507 assert(!_switchedOut);
508 _switchedOut = true;
509 if (profileEvent && profileEvent->scheduled())
510 deschedule(profileEvent);
511
512 // Flush all TLBs in the CPU to avoid having stale translations if
513 // it gets switched in later.
514 flushTLBs();
515}
516
517void
518BaseCPU::takeOverFrom(BaseCPU *oldCPU)
519{
520 assert(threadContexts.size() == oldCPU->threadContexts.size());
521 assert(_cpuId == oldCPU->cpuId());
522 assert(_switchedOut);
523 assert(oldCPU != this);
524 _pid = oldCPU->getPid();
525 _taskId = oldCPU->taskId();
526 _switchedOut = false;
527
528 ThreadID size = threadContexts.size();
529 for (ThreadID i = 0; i < size; ++i) {
530 ThreadContext *newTC = threadContexts[i];
531 ThreadContext *oldTC = oldCPU->threadContexts[i];
532
533 newTC->takeOverFrom(oldTC);
534
535 CpuEvent::replaceThreadContext(oldTC, newTC);
536
537 assert(newTC->contextId() == oldTC->contextId());
538 assert(newTC->threadId() == oldTC->threadId());
539 system->replaceThreadContext(newTC, newTC->contextId());
540
541 /* This code no longer works since the zero register (e.g.,
542 * r31 on Alpha) doesn't necessarily contain zero at this
543 * point.
544 if (DTRACE(Context))
545 ThreadContext::compare(oldTC, newTC);
546 */
547
548 BaseMasterPort *old_itb_port = oldTC->getITBPtr()->getMasterPort();
549 BaseMasterPort *old_dtb_port = oldTC->getDTBPtr()->getMasterPort();
550 BaseMasterPort *new_itb_port = newTC->getITBPtr()->getMasterPort();
551 BaseMasterPort *new_dtb_port = newTC->getDTBPtr()->getMasterPort();
552
553 // Move over any table walker ports if they exist
554 if (new_itb_port) {
555 assert(!new_itb_port->isConnected());
556 assert(old_itb_port);
557 assert(old_itb_port->isConnected());
558 BaseSlavePort &slavePort = old_itb_port->getSlavePort();
559 old_itb_port->unbind();
560 new_itb_port->bind(slavePort);
561 }
562 if (new_dtb_port) {
563 assert(!new_dtb_port->isConnected());
564 assert(old_dtb_port);
565 assert(old_dtb_port->isConnected());
566 BaseSlavePort &slavePort = old_dtb_port->getSlavePort();
567 old_dtb_port->unbind();
568 new_dtb_port->bind(slavePort);
569 }
570 newTC->getITBPtr()->takeOverFrom(oldTC->getITBPtr());
571 newTC->getDTBPtr()->takeOverFrom(oldTC->getDTBPtr());
572
573 // Checker whether or not we have to transfer CheckerCPU
574 // objects over in the switch
575 CheckerCPU *oldChecker = oldTC->getCheckerCpuPtr();
576 CheckerCPU *newChecker = newTC->getCheckerCpuPtr();
577 if (oldChecker && newChecker) {
578 BaseMasterPort *old_checker_itb_port =
579 oldChecker->getITBPtr()->getMasterPort();
580 BaseMasterPort *old_checker_dtb_port =
581 oldChecker->getDTBPtr()->getMasterPort();
582 BaseMasterPort *new_checker_itb_port =
583 newChecker->getITBPtr()->getMasterPort();
584 BaseMasterPort *new_checker_dtb_port =
585 newChecker->getDTBPtr()->getMasterPort();
586
587 newChecker->getITBPtr()->takeOverFrom(oldChecker->getITBPtr());
588 newChecker->getDTBPtr()->takeOverFrom(oldChecker->getDTBPtr());
589
590 // Move over any table walker ports if they exist for checker
591 if (new_checker_itb_port) {
592 assert(!new_checker_itb_port->isConnected());
593 assert(old_checker_itb_port);
594 assert(old_checker_itb_port->isConnected());
595 BaseSlavePort &slavePort =
596 old_checker_itb_port->getSlavePort();
597 old_checker_itb_port->unbind();
598 new_checker_itb_port->bind(slavePort);
599 }
600 if (new_checker_dtb_port) {
601 assert(!new_checker_dtb_port->isConnected());
602 assert(old_checker_dtb_port);
603 assert(old_checker_dtb_port->isConnected());
604 BaseSlavePort &slavePort =
605 old_checker_dtb_port->getSlavePort();
606 old_checker_dtb_port->unbind();
607 new_checker_dtb_port->bind(slavePort);
608 }
609 }
610 }
611
612 interrupts = oldCPU->interrupts;
613 for (ThreadID tid = 0; tid < numThreads; tid++) {
614 interrupts[tid]->setCPU(this);
615 }
616 oldCPU->interrupts.clear();
617
618 if (FullSystem) {
619 for (ThreadID i = 0; i < size; ++i)
620 threadContexts[i]->profileClear();
621
622 if (profileEvent)
623 schedule(profileEvent, curTick());
624 }
625
626 // All CPUs have an instruction and a data port, and the new CPU's
627 // ports are dangling while the old CPU has its ports connected
628 // already. Unbind the old CPU and then bind the ports of the one
629 // we are switching to.
630 assert(!getInstPort().isConnected());
631 assert(oldCPU->getInstPort().isConnected());
632 BaseSlavePort &inst_peer_port = oldCPU->getInstPort().getSlavePort();
633 oldCPU->getInstPort().unbind();
634 getInstPort().bind(inst_peer_port);
635
636 assert(!getDataPort().isConnected());
637 assert(oldCPU->getDataPort().isConnected());
638 BaseSlavePort &data_peer_port = oldCPU->getDataPort().getSlavePort();
639 oldCPU->getDataPort().unbind();
640 getDataPort().bind(data_peer_port);
641}
642
643void
644BaseCPU::flushTLBs()
645{
646 for (ThreadID i = 0; i < threadContexts.size(); ++i) {
647 ThreadContext &tc(*threadContexts[i]);
648 CheckerCPU *checker(tc.getCheckerCpuPtr());
649
650 tc.getITBPtr()->flushAll();
651 tc.getDTBPtr()->flushAll();
652 if (checker) {
653 checker->getITBPtr()->flushAll();
654 checker->getDTBPtr()->flushAll();
655 }
656 }
657}
658
659
660BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, Tick _interval)
661 : cpu(_cpu), interval(_interval)
662{ }
663
664void
665BaseCPU::ProfileEvent::process()
666{
667 ThreadID size = cpu->threadContexts.size();
668 for (ThreadID i = 0; i < size; ++i) {
669 ThreadContext *tc = cpu->threadContexts[i];
670 tc->profileSample();
671 }
672
673 cpu->schedule(this, curTick() + interval);
674}
675
676void
677BaseCPU::serialize(CheckpointOut &cp) const
678{
679 SERIALIZE_SCALAR(instCnt);
680
681 if (!_switchedOut) {
682 /* Unlike _pid, _taskId is not serialized, as they are dynamically
683 * assigned unique ids that are only meaningful for the duration of
684 * a specific run. We will need to serialize the entire taskMap in
685 * system. */
686 SERIALIZE_SCALAR(_pid);
687
688 // Serialize the threads, this is done by the CPU implementation.
689 for (ThreadID i = 0; i < numThreads; ++i) {
690 ScopedCheckpointSection sec(cp, csprintf("xc.%i", i));
691 interrupts[i]->serialize(cp);
692 serializeThread(cp, i);
693 }
694 }
695}
696
697void
698BaseCPU::unserialize(CheckpointIn &cp)
699{
700 UNSERIALIZE_SCALAR(instCnt);
701
702 if (!_switchedOut) {
703 UNSERIALIZE_SCALAR(_pid);
704
705 // Unserialize the threads, this is done by the CPU implementation.
706 for (ThreadID i = 0; i < numThreads; ++i) {
707 ScopedCheckpointSection sec(cp, csprintf("xc.%i", i));
708 interrupts[i]->unserialize(cp);
709 unserializeThread(cp, i);
710 }
711 }
712}
713
714void
715BaseCPU::scheduleInstStop(ThreadID tid, Counter insts, const char *cause)
716{
717 const Tick now(comInstEventQueue[tid]->getCurTick());
718 Event *event(new LocalSimLoopExitEvent(cause, 0));
719
720 comInstEventQueue[tid]->schedule(event, now + insts);
721}
722
723uint64_t
724BaseCPU::getCurrentInstCount(ThreadID tid)
725{
726 return Tick(comInstEventQueue[tid]->getCurTick());
727}
728
729AddressMonitor::AddressMonitor() {
730 armed = false;
731 waiting = false;
732 gotWakeup = false;
733}
734
735bool AddressMonitor::doMonitor(PacketPtr pkt) {
736 assert(pkt->req->hasPaddr());
737 if (armed && waiting) {
738 if (pAddr == pkt->getAddr()) {
739 DPRINTF(Mwait,"pAddr=0x%lx invalidated: waking up core\n",
740 pkt->getAddr());
741 waiting = false;
742 return true;
743 }
744 }
745 return false;
746}
747
748void
749BaseCPU::scheduleLoadStop(ThreadID tid, Counter loads, const char *cause)
750{
751 const Tick now(comLoadEventQueue[tid]->getCurTick());
752 Event *event(new LocalSimLoopExitEvent(cause, 0));
753
754 comLoadEventQueue[tid]->schedule(event, now + loads);
755}
756
757
758void
759BaseCPU::traceFunctionsInternal(Addr pc)
760{
761 if (!debugSymbolTable)
762 return;
763
764 // if pc enters different function, print new function symbol and
765 // update saved range. Otherwise do nothing.
766 if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
767 string sym_str;
768 bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
769 currentFunctionStart,
770 currentFunctionEnd);
771
772 if (!found) {
773 // no symbol found: use addr as label
774 sym_str = csprintf("0x%x", pc);
775 currentFunctionStart = pc;
776 currentFunctionEnd = pc + 1;
777 }
778
779 ccprintf(*functionTraceStream, " (%d)\n%d: %s",
780 curTick() - functionEntryTick, curTick(), sym_str);
781 functionEntryTick = curTick();
782 }
783}
| 61#include "cpu/cpuevent.hh"
62#include "cpu/profile.hh"
63#include "cpu/thread_context.hh"
64#include "debug/Mwait.hh"
65#include "debug/SyscallVerbose.hh"
66#include "mem/page_table.hh"
67#include "params/BaseCPU.hh"
68#include "sim/clocked_object.hh"
69#include "sim/full_system.hh"
70#include "sim/process.hh"
71#include "sim/sim_events.hh"
72#include "sim/sim_exit.hh"
73#include "sim/system.hh"
74
75// Hack
76#include "sim/stat_control.hh"
77
78using namespace std;
79
80vector<BaseCPU *> BaseCPU::cpuList;
81
82// This variable reflects the max number of threads in any CPU. Be
83// careful to only use it once all the CPUs that you care about have
84// been initialized
85int maxThreadsPerCPU = 1;
86
87CPUProgressEvent::CPUProgressEvent(BaseCPU *_cpu, Tick ival)
88 : Event(Event::Progress_Event_Pri), _interval(ival), lastNumInst(0),
89 cpu(_cpu), _repeatEvent(true)
90{
91 if (_interval)
92 cpu->schedule(this, curTick() + _interval);
93}
94
95void
96CPUProgressEvent::process()
97{
98 Counter temp = cpu->totalOps();
99
100 if (_repeatEvent)
101 cpu->schedule(this, curTick() + _interval);
102
103 if (cpu->switchedOut()) {
104 return;
105 }
106
107#ifndef NDEBUG
108 double ipc = double(temp - lastNumInst) / (_interval / cpu->clockPeriod());
109
110 DPRINTFN("%s progress event, total committed:%i, progress insts committed: "
111 "%lli, IPC: %0.8d\n", cpu->name(), temp, temp - lastNumInst,
112 ipc);
113 ipc = 0.0;
114#else
115 cprintf("%lli: %s progress event, total committed:%i, progress insts "
116 "committed: %lli\n", curTick(), cpu->name(), temp,
117 temp - lastNumInst);
118#endif
119 lastNumInst = temp;
120}
121
122const char *
123CPUProgressEvent::description() const
124{
125 return "CPU Progress";
126}
127
128BaseCPU::BaseCPU(Params *p, bool is_checker)
129 : MemObject(p), instCnt(0), _cpuId(p->cpu_id), _socketId(p->socket_id),
130 _instMasterId(p->system->getMasterId(name() + ".inst")),
131 _dataMasterId(p->system->getMasterId(name() + ".data")),
132 _taskId(ContextSwitchTaskId::Unknown), _pid(invldPid),
133 _switchedOut(p->switched_out), _cacheLineSize(p->system->cacheLineSize()),
134 interrupts(p->interrupts), profileEvent(NULL),
135 numThreads(p->numThreads), system(p->system),
136 functionTraceStream(nullptr), currentFunctionStart(0),
137 currentFunctionEnd(0), functionEntryTick(0),
138 addressMonitor(p->numThreads)
139{
140 // if Python did not provide a valid ID, do it here
141 if (_cpuId == -1 ) {
142 _cpuId = cpuList.size();
143 }
144
145 // add self to global list of CPUs
146 cpuList.push_back(this);
147
148 DPRINTF(SyscallVerbose, "Constructing CPU with id %d, socket id %d\n",
149 _cpuId, _socketId);
150
151 if (numThreads > maxThreadsPerCPU)
152 maxThreadsPerCPU = numThreads;
153
154 // allocate per-thread instruction-based event queues
155 comInstEventQueue = new EventQueue *[numThreads];
156 for (ThreadID tid = 0; tid < numThreads; ++tid)
157 comInstEventQueue[tid] =
158 new EventQueue("instruction-based event queue");
159
160 //
161 // set up instruction-count-based termination events, if any
162 //
163 if (p->max_insts_any_thread != 0) {
164 const char *cause = "a thread reached the max instruction count";
165 for (ThreadID tid = 0; tid < numThreads; ++tid)
166 scheduleInstStop(tid, p->max_insts_any_thread, cause);
167 }
168
169 // Set up instruction-count-based termination events for SimPoints
170 // Typically, there are more than one action points.
171 // Simulation.py is responsible to take the necessary actions upon
172 // exitting the simulation loop.
173 if (!p->simpoint_start_insts.empty()) {
174 const char *cause = "simpoint starting point found";
175 for (size_t i = 0; i < p->simpoint_start_insts.size(); ++i)
176 scheduleInstStop(0, p->simpoint_start_insts[i], cause);
177 }
178
179 if (p->max_insts_all_threads != 0) {
180 const char *cause = "all threads reached the max instruction count";
181
182 // allocate & initialize shared downcounter: each event will
183 // decrement this when triggered; simulation will terminate
184 // when counter reaches 0
185 int *counter = new int;
186 *counter = numThreads;
187 for (ThreadID tid = 0; tid < numThreads; ++tid) {
188 Event *event = new CountedExitEvent(cause, *counter);
189 comInstEventQueue[tid]->schedule(event, p->max_insts_all_threads);
190 }
191 }
192
193 // allocate per-thread load-based event queues
194 comLoadEventQueue = new EventQueue *[numThreads];
195 for (ThreadID tid = 0; tid < numThreads; ++tid)
196 comLoadEventQueue[tid] = new EventQueue("load-based event queue");
197
198 //
199 // set up instruction-count-based termination events, if any
200 //
201 if (p->max_loads_any_thread != 0) {
202 const char *cause = "a thread reached the max load count";
203 for (ThreadID tid = 0; tid < numThreads; ++tid)
204 scheduleLoadStop(tid, p->max_loads_any_thread, cause);
205 }
206
207 if (p->max_loads_all_threads != 0) {
208 const char *cause = "all threads reached the max load count";
209 // allocate & initialize shared downcounter: each event will
210 // decrement this when triggered; simulation will terminate
211 // when counter reaches 0
212 int *counter = new int;
213 *counter = numThreads;
214 for (ThreadID tid = 0; tid < numThreads; ++tid) {
215 Event *event = new CountedExitEvent(cause, *counter);
216 comLoadEventQueue[tid]->schedule(event, p->max_loads_all_threads);
217 }
218 }
219
220 functionTracingEnabled = false;
221 if (p->function_trace) {
222 const string fname = csprintf("ftrace.%s", name());
223 functionTraceStream = simout.findOrCreate(fname)->stream();
224
225 currentFunctionStart = currentFunctionEnd = 0;
226 functionEntryTick = p->function_trace_start;
227
228 if (p->function_trace_start == 0) {
229 functionTracingEnabled = true;
230 } else {
231 typedef EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace> wrap;
232 Event *event = new wrap(this, true);
233 schedule(event, p->function_trace_start);
234 }
235 }
236
237 // The interrupts should always be present unless this CPU is
238 // switched in later or in case it is a checker CPU
239 if (!params()->switched_out && !is_checker) {
240 fatal_if(interrupts.size() != numThreads,
241 "CPU %s has %i interrupt controllers, but is expecting one "
242 "per thread (%i)\n",
243 name(), interrupts.size(), numThreads);
244 for (ThreadID tid = 0; tid < numThreads; tid++)
245 interrupts[tid]->setCPU(this);
246 }
247
248 if (FullSystem) {
249 if (params()->profile)
250 profileEvent = new ProfileEvent(this, params()->profile);
251 }
252 tracer = params()->tracer;
253
254 if (params()->isa.size() != numThreads) {
255 fatal("Number of ISAs (%i) assigned to the CPU does not equal number "
256 "of threads (%i).\n", params()->isa.size(), numThreads);
257 }
258}
259
260void
261BaseCPU::enableFunctionTrace()
262{
263 functionTracingEnabled = true;
264}
265
266BaseCPU::~BaseCPU()
267{
268 delete profileEvent;
269 delete[] comLoadEventQueue;
270 delete[] comInstEventQueue;
271}
272
273void
274BaseCPU::armMonitor(ThreadID tid, Addr address)
275{
276 assert(tid < numThreads);
277 AddressMonitor &monitor = addressMonitor[tid];
278
279 monitor.armed = true;
280 monitor.vAddr = address;
281 monitor.pAddr = 0x0;
282 DPRINTF(Mwait,"[tid:%d] Armed monitor (vAddr=0x%lx)\n", tid, address);
283}
284
285bool
286BaseCPU::mwait(ThreadID tid, PacketPtr pkt)
287{
288 assert(tid < numThreads);
289 AddressMonitor &monitor = addressMonitor[tid];
290
291 if (!monitor.gotWakeup) {
292 int block_size = cacheLineSize();
293 uint64_t mask = ~((uint64_t)(block_size - 1));
294
295 assert(pkt->req->hasPaddr());
296 monitor.pAddr = pkt->getAddr() & mask;
297 monitor.waiting = true;
298
299 DPRINTF(Mwait,"[tid:%d] mwait called (vAddr=0x%lx, "
300 "line's paddr=0x%lx)\n", tid, monitor.vAddr, monitor.pAddr);
301 return true;
302 } else {
303 monitor.gotWakeup = false;
304 return false;
305 }
306}
307
308void
309BaseCPU::mwaitAtomic(ThreadID tid, ThreadContext *tc, TheISA::TLB *dtb)
310{
311 assert(tid < numThreads);
312 AddressMonitor &monitor = addressMonitor[tid];
313
314 Request req;
315 Addr addr = monitor.vAddr;
316 int block_size = cacheLineSize();
317 uint64_t mask = ~((uint64_t)(block_size - 1));
318 int size = block_size;
319
320 //The address of the next line if it crosses a cache line boundary.
321 Addr secondAddr = roundDown(addr + size - 1, block_size);
322
323 if (secondAddr > addr)
324 size = secondAddr - addr;
325
326 req.setVirt(0, addr, size, 0x0, dataMasterId(), tc->instAddr());
327
328 // translate to physical address
329 Fault fault = dtb->translateAtomic(&req, tc, BaseTLB::Read);
330 assert(fault == NoFault);
331
332 monitor.pAddr = req.getPaddr() & mask;
333 monitor.waiting = true;
334
335 DPRINTF(Mwait,"[tid:%d] mwait called (vAddr=0x%lx, line's paddr=0x%lx)\n",
336 tid, monitor.vAddr, monitor.pAddr);
337}
338
339void
340BaseCPU::init()
341{
342 if (!params()->switched_out) {
343 registerThreadContexts();
344
345 verifyMemoryMode();
346 }
347}
348
349void
350BaseCPU::startup()
351{
352 if (FullSystem) {
353 if (!params()->switched_out && profileEvent)
354 schedule(profileEvent, curTick());
355 }
356
357 if (params()->progress_interval) {
358 new CPUProgressEvent(this, params()->progress_interval);
359 }
360
361 // Assumption CPU start to operate instantaneously without any latency
362 if (ClockedObject::pwrState() == Enums::PwrState::UNDEFINED)
363 ClockedObject::pwrState(Enums::PwrState::ON);
364
365}
366
367ProbePoints::PMUUPtr
368BaseCPU::pmuProbePoint(const char *name)
369{
370 ProbePoints::PMUUPtr ptr;
371 ptr.reset(new ProbePoints::PMU(getProbeManager(), name));
372
373 return ptr;
374}
375
376void
377BaseCPU::regProbePoints()
378{
379 ppCycles = pmuProbePoint("Cycles");
380
381 ppRetiredInsts = pmuProbePoint("RetiredInsts");
382 ppRetiredLoads = pmuProbePoint("RetiredLoads");
383 ppRetiredStores = pmuProbePoint("RetiredStores");
384 ppRetiredBranches = pmuProbePoint("RetiredBranches");
385}
386
387void
388BaseCPU::probeInstCommit(const StaticInstPtr &inst)
389{
390 if (!inst->isMicroop() || inst->isLastMicroop())
391 ppRetiredInsts->notify(1);
392
393
394 if (inst->isLoad())
395 ppRetiredLoads->notify(1);
396
397 if (inst->isStore())
398 ppRetiredStores->notify(1);
399
400 if (inst->isControl())
401 ppRetiredBranches->notify(1);
402}
403
404void
405BaseCPU::regStats()
406{
407 MemObject::regStats();
408
409 using namespace Stats;
410
411 numCycles
412 .name(name() + ".numCycles")
413 .desc("number of cpu cycles simulated")
414 ;
415
416 numWorkItemsStarted
417 .name(name() + ".numWorkItemsStarted")
418 .desc("number of work items this cpu started")
419 ;
420
421 numWorkItemsCompleted
422 .name(name() + ".numWorkItemsCompleted")
423 .desc("number of work items this cpu completed")
424 ;
425
426 int size = threadContexts.size();
427 if (size > 1) {
428 for (int i = 0; i < size; ++i) {
429 stringstream namestr;
430 ccprintf(namestr, "%s.ctx%d", name(), i);
431 threadContexts[i]->regStats(namestr.str());
432 }
433 } else if (size == 1)
434 threadContexts[0]->regStats(name());
435}
436
437BaseMasterPort &
438BaseCPU::getMasterPort(const string &if_name, PortID idx)
439{
440 // Get the right port based on name. This applies to all the
441 // subclasses of the base CPU and relies on their implementation
442 // of getDataPort and getInstPort. In all cases there methods
443 // return a MasterPort pointer.
444 if (if_name == "dcache_port")
445 return getDataPort();
446 else if (if_name == "icache_port")
447 return getInstPort();
448 else
449 return MemObject::getMasterPort(if_name, idx);
450}
451
452void
453BaseCPU::registerThreadContexts()
454{
455 assert(system->multiThread || numThreads == 1);
456
457 ThreadID size = threadContexts.size();
458 for (ThreadID tid = 0; tid < size; ++tid) {
459 ThreadContext *tc = threadContexts[tid];
460
461 if (system->multiThread) {
462 tc->setContextId(system->registerThreadContext(tc));
463 } else {
464 tc->setContextId(system->registerThreadContext(tc, _cpuId));
465 }
466
467 if (!FullSystem)
468 tc->getProcessPtr()->assignThreadContext(tc->contextId());
469 }
470}
471
472
473int
474BaseCPU::findContext(ThreadContext *tc)
475{
476 ThreadID size = threadContexts.size();
477 for (ThreadID tid = 0; tid < size; ++tid) {
478 if (tc == threadContexts[tid])
479 return tid;
480 }
481 return 0;
482}
483
484void
485BaseCPU::activateContext(ThreadID thread_num)
486{
487 // For any active thread running, update CPU power state to active (ON)
488 ClockedObject::pwrState(Enums::PwrState::ON);
489}
490
491void
492BaseCPU::suspendContext(ThreadID thread_num)
493{
494 // Check if all threads are suspended
495 for (auto t : threadContexts) {
496 if (t->status() != ThreadContext::Suspended) {
497 return;
498 }
499 }
500
501 // All CPU threads suspended, enter lower power state for the CPU
502 ClockedObject::pwrState(Enums::PwrState::CLK_GATED);
503}
504
505void
506BaseCPU::switchOut()
507{
508 assert(!_switchedOut);
509 _switchedOut = true;
510 if (profileEvent && profileEvent->scheduled())
511 deschedule(profileEvent);
512
513 // Flush all TLBs in the CPU to avoid having stale translations if
514 // it gets switched in later.
515 flushTLBs();
516}
517
518void
519BaseCPU::takeOverFrom(BaseCPU *oldCPU)
520{
521 assert(threadContexts.size() == oldCPU->threadContexts.size());
522 assert(_cpuId == oldCPU->cpuId());
523 assert(_switchedOut);
524 assert(oldCPU != this);
525 _pid = oldCPU->getPid();
526 _taskId = oldCPU->taskId();
527 _switchedOut = false;
528
529 ThreadID size = threadContexts.size();
530 for (ThreadID i = 0; i < size; ++i) {
531 ThreadContext *newTC = threadContexts[i];
532 ThreadContext *oldTC = oldCPU->threadContexts[i];
533
534 newTC->takeOverFrom(oldTC);
535
536 CpuEvent::replaceThreadContext(oldTC, newTC);
537
538 assert(newTC->contextId() == oldTC->contextId());
539 assert(newTC->threadId() == oldTC->threadId());
540 system->replaceThreadContext(newTC, newTC->contextId());
541
542 /* This code no longer works since the zero register (e.g.,
543 * r31 on Alpha) doesn't necessarily contain zero at this
544 * point.
545 if (DTRACE(Context))
546 ThreadContext::compare(oldTC, newTC);
547 */
548
549 BaseMasterPort *old_itb_port = oldTC->getITBPtr()->getMasterPort();
550 BaseMasterPort *old_dtb_port = oldTC->getDTBPtr()->getMasterPort();
551 BaseMasterPort *new_itb_port = newTC->getITBPtr()->getMasterPort();
552 BaseMasterPort *new_dtb_port = newTC->getDTBPtr()->getMasterPort();
553
554 // Move over any table walker ports if they exist
555 if (new_itb_port) {
556 assert(!new_itb_port->isConnected());
557 assert(old_itb_port);
558 assert(old_itb_port->isConnected());
559 BaseSlavePort &slavePort = old_itb_port->getSlavePort();
560 old_itb_port->unbind();
561 new_itb_port->bind(slavePort);
562 }
563 if (new_dtb_port) {
564 assert(!new_dtb_port->isConnected());
565 assert(old_dtb_port);
566 assert(old_dtb_port->isConnected());
567 BaseSlavePort &slavePort = old_dtb_port->getSlavePort();
568 old_dtb_port->unbind();
569 new_dtb_port->bind(slavePort);
570 }
571 newTC->getITBPtr()->takeOverFrom(oldTC->getITBPtr());
572 newTC->getDTBPtr()->takeOverFrom(oldTC->getDTBPtr());
573
574 // Checker whether or not we have to transfer CheckerCPU
575 // objects over in the switch
576 CheckerCPU *oldChecker = oldTC->getCheckerCpuPtr();
577 CheckerCPU *newChecker = newTC->getCheckerCpuPtr();
578 if (oldChecker && newChecker) {
579 BaseMasterPort *old_checker_itb_port =
580 oldChecker->getITBPtr()->getMasterPort();
581 BaseMasterPort *old_checker_dtb_port =
582 oldChecker->getDTBPtr()->getMasterPort();
583 BaseMasterPort *new_checker_itb_port =
584 newChecker->getITBPtr()->getMasterPort();
585 BaseMasterPort *new_checker_dtb_port =
586 newChecker->getDTBPtr()->getMasterPort();
587
588 newChecker->getITBPtr()->takeOverFrom(oldChecker->getITBPtr());
589 newChecker->getDTBPtr()->takeOverFrom(oldChecker->getDTBPtr());
590
591 // Move over any table walker ports if they exist for checker
592 if (new_checker_itb_port) {
593 assert(!new_checker_itb_port->isConnected());
594 assert(old_checker_itb_port);
595 assert(old_checker_itb_port->isConnected());
596 BaseSlavePort &slavePort =
597 old_checker_itb_port->getSlavePort();
598 old_checker_itb_port->unbind();
599 new_checker_itb_port->bind(slavePort);
600 }
601 if (new_checker_dtb_port) {
602 assert(!new_checker_dtb_port->isConnected());
603 assert(old_checker_dtb_port);
604 assert(old_checker_dtb_port->isConnected());
605 BaseSlavePort &slavePort =
606 old_checker_dtb_port->getSlavePort();
607 old_checker_dtb_port->unbind();
608 new_checker_dtb_port->bind(slavePort);
609 }
610 }
611 }
612
613 interrupts = oldCPU->interrupts;
614 for (ThreadID tid = 0; tid < numThreads; tid++) {
615 interrupts[tid]->setCPU(this);
616 }
617 oldCPU->interrupts.clear();
618
619 if (FullSystem) {
620 for (ThreadID i = 0; i < size; ++i)
621 threadContexts[i]->profileClear();
622
623 if (profileEvent)
624 schedule(profileEvent, curTick());
625 }
626
627 // All CPUs have an instruction and a data port, and the new CPU's
628 // ports are dangling while the old CPU has its ports connected
629 // already. Unbind the old CPU and then bind the ports of the one
630 // we are switching to.
631 assert(!getInstPort().isConnected());
632 assert(oldCPU->getInstPort().isConnected());
633 BaseSlavePort &inst_peer_port = oldCPU->getInstPort().getSlavePort();
634 oldCPU->getInstPort().unbind();
635 getInstPort().bind(inst_peer_port);
636
637 assert(!getDataPort().isConnected());
638 assert(oldCPU->getDataPort().isConnected());
639 BaseSlavePort &data_peer_port = oldCPU->getDataPort().getSlavePort();
640 oldCPU->getDataPort().unbind();
641 getDataPort().bind(data_peer_port);
642}
643
644void
645BaseCPU::flushTLBs()
646{
647 for (ThreadID i = 0; i < threadContexts.size(); ++i) {
648 ThreadContext &tc(*threadContexts[i]);
649 CheckerCPU *checker(tc.getCheckerCpuPtr());
650
651 tc.getITBPtr()->flushAll();
652 tc.getDTBPtr()->flushAll();
653 if (checker) {
654 checker->getITBPtr()->flushAll();
655 checker->getDTBPtr()->flushAll();
656 }
657 }
658}
659
660
661BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, Tick _interval)
662 : cpu(_cpu), interval(_interval)
663{ }
664
665void
666BaseCPU::ProfileEvent::process()
667{
668 ThreadID size = cpu->threadContexts.size();
669 for (ThreadID i = 0; i < size; ++i) {
670 ThreadContext *tc = cpu->threadContexts[i];
671 tc->profileSample();
672 }
673
674 cpu->schedule(this, curTick() + interval);
675}
676
677void
678BaseCPU::serialize(CheckpointOut &cp) const
679{
680 SERIALIZE_SCALAR(instCnt);
681
682 if (!_switchedOut) {
683 /* Unlike _pid, _taskId is not serialized, as they are dynamically
684 * assigned unique ids that are only meaningful for the duration of
685 * a specific run. We will need to serialize the entire taskMap in
686 * system. */
687 SERIALIZE_SCALAR(_pid);
688
689 // Serialize the threads, this is done by the CPU implementation.
690 for (ThreadID i = 0; i < numThreads; ++i) {
691 ScopedCheckpointSection sec(cp, csprintf("xc.%i", i));
692 interrupts[i]->serialize(cp);
693 serializeThread(cp, i);
694 }
695 }
696}
697
698void
699BaseCPU::unserialize(CheckpointIn &cp)
700{
701 UNSERIALIZE_SCALAR(instCnt);
702
703 if (!_switchedOut) {
704 UNSERIALIZE_SCALAR(_pid);
705
706 // Unserialize the threads, this is done by the CPU implementation.
707 for (ThreadID i = 0; i < numThreads; ++i) {
708 ScopedCheckpointSection sec(cp, csprintf("xc.%i", i));
709 interrupts[i]->unserialize(cp);
710 unserializeThread(cp, i);
711 }
712 }
713}
714
715void
716BaseCPU::scheduleInstStop(ThreadID tid, Counter insts, const char *cause)
717{
718 const Tick now(comInstEventQueue[tid]->getCurTick());
719 Event *event(new LocalSimLoopExitEvent(cause, 0));
720
721 comInstEventQueue[tid]->schedule(event, now + insts);
722}
723
724uint64_t
725BaseCPU::getCurrentInstCount(ThreadID tid)
726{
727 return Tick(comInstEventQueue[tid]->getCurTick());
728}
729
730AddressMonitor::AddressMonitor() {
731 armed = false;
732 waiting = false;
733 gotWakeup = false;
734}
735
736bool AddressMonitor::doMonitor(PacketPtr pkt) {
737 assert(pkt->req->hasPaddr());
738 if (armed && waiting) {
739 if (pAddr == pkt->getAddr()) {
740 DPRINTF(Mwait,"pAddr=0x%lx invalidated: waking up core\n",
741 pkt->getAddr());
742 waiting = false;
743 return true;
744 }
745 }
746 return false;
747}
748
749void
750BaseCPU::scheduleLoadStop(ThreadID tid, Counter loads, const char *cause)
751{
752 const Tick now(comLoadEventQueue[tid]->getCurTick());
753 Event *event(new LocalSimLoopExitEvent(cause, 0));
754
755 comLoadEventQueue[tid]->schedule(event, now + loads);
756}
757
758
759void
760BaseCPU::traceFunctionsInternal(Addr pc)
761{
762 if (!debugSymbolTable)
763 return;
764
765 // if pc enters different function, print new function symbol and
766 // update saved range. Otherwise do nothing.
767 if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
768 string sym_str;
769 bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
770 currentFunctionStart,
771 currentFunctionEnd);
772
773 if (!found) {
774 // no symbol found: use addr as label
775 sym_str = csprintf("0x%x", pc);
776 currentFunctionStart = pc;
777 currentFunctionEnd = pc + 1;
778 }
779
780 ccprintf(*functionTraceStream, " (%d)\n%d: %s",
781 curTick() - functionEntryTick, curTick(), sym_str);
782 functionEntryTick = curTick();
783 }
784}
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