base.cc revision 3814:33bd4ec9d66a 
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 *          Nathan Binkert
30 */
31
32#include <iostream>
33#include <string>
34#include <sstream>
35
36#include "base/cprintf.hh"
37#include "base/loader/symtab.hh"
38#include "base/misc.hh"
39#include "base/output.hh"
40#include "cpu/base.hh"
41#include "cpu/cpuevent.hh"
42#include "cpu/thread_context.hh"
43#include "cpu/profile.hh"
44#include "sim/sim_exit.hh"
45#include "sim/param.hh"
46#include "sim/process.hh"
47#include "sim/sim_events.hh"
48#include "sim/system.hh"
49
50#include "base/trace.hh"
51
52// Hack
53#include "sim/stat_control.hh"
54
55using namespace std;
56
57vector<BaseCPU *> BaseCPU::cpuList;
58
59// This variable reflects the max number of threads in any CPU.  Be
60// careful to only use it once all the CPUs that you care about have
61// been initialized
62int maxThreadsPerCPU = 1;
63
64CPUProgressEvent::CPUProgressEvent(EventQueue *q, Tick ival,
65                                   BaseCPU *_cpu)
66    : Event(q, Event::Stat_Event_Pri), interval(ival),
67      lastNumInst(0), cpu(_cpu)
68{
69    if (interval)
70        schedule(curTick + interval);
71}
72
73void
74CPUProgressEvent::process()
75{
76    Counter temp = cpu->totalInstructions();
77#ifndef NDEBUG
78    double ipc = double(temp - lastNumInst) / (interval / cpu->cycles(1));
79
80    DPRINTFN("%s progress event, instructions committed: %lli, IPC: %0.8d\n",
81             cpu->name(), temp - lastNumInst, ipc);
82    ipc = 0.0;
83#else
84    cprintf("%lli: %s progress event, instructions committed: %lli\n",
85            curTick, cpu->name(), temp - lastNumInst);
86#endif
87    lastNumInst = temp;
88    schedule(curTick + interval);
89}
90
91const char *
92CPUProgressEvent::description()
93{
94    return "CPU Progress event";
95}
96
97#if FULL_SYSTEM
98BaseCPU::BaseCPU(Params *p)
99    : MemObject(p->name), clock(p->clock), instCnt(0), checkInterrupts(true),
100      params(p), number_of_threads(p->numberOfThreads), system(p->system),
101      phase(p->phase)
102#else
103BaseCPU::BaseCPU(Params *p)
104    : MemObject(p->name), clock(p->clock), params(p),
105      number_of_threads(p->numberOfThreads), system(p->system),
106      phase(p->phase)
107#endif
108{
109//    currentTick = curTick;
110    DPRINTF(FullCPU, "BaseCPU: Creating object, mem address %#x.\n", this);
111
112    // add self to global list of CPUs
113    cpuList.push_back(this);
114
115    DPRINTF(FullCPU, "BaseCPU: CPU added to cpuList, mem address %#x.\n",
116            this);
117
118    if (number_of_threads > maxThreadsPerCPU)
119        maxThreadsPerCPU = number_of_threads;
120
121    // allocate per-thread instruction-based event queues
122    comInstEventQueue = new EventQueue *[number_of_threads];
123    for (int i = 0; i < number_of_threads; ++i)
124        comInstEventQueue[i] = new EventQueue("instruction-based event queue");
125
126    //
127    // set up instruction-count-based termination events, if any
128    //
129    if (p->max_insts_any_thread != 0)
130        for (int i = 0; i < number_of_threads; ++i)
131            schedExitSimLoop("a thread reached the max instruction count",
132                             p->max_insts_any_thread, 0,
133                             comInstEventQueue[i]);
134
135    if (p->max_insts_all_threads != 0) {
136        // allocate & initialize shared downcounter: each event will
137        // decrement this when triggered; simulation will terminate
138        // when counter reaches 0
139        int *counter = new int;
140        *counter = number_of_threads;
141        for (int i = 0; i < number_of_threads; ++i)
142            new CountedExitEvent(comInstEventQueue[i],
143                "all threads reached the max instruction count",
144                p->max_insts_all_threads, *counter);
145    }
146
147    // allocate per-thread load-based event queues
148    comLoadEventQueue = new EventQueue *[number_of_threads];
149    for (int i = 0; i < number_of_threads; ++i)
150        comLoadEventQueue[i] = new EventQueue("load-based event queue");
151
152    //
153    // set up instruction-count-based termination events, if any
154    //
155    if (p->max_loads_any_thread != 0)
156        for (int i = 0; i < number_of_threads; ++i)
157            schedExitSimLoop("a thread reached the max load count",
158                             p->max_loads_any_thread, 0,
159                             comLoadEventQueue[i]);
160
161    if (p->max_loads_all_threads != 0) {
162        // allocate & initialize shared downcounter: each event will
163        // decrement this when triggered; simulation will terminate
164        // when counter reaches 0
165        int *counter = new int;
166        *counter = number_of_threads;
167        for (int i = 0; i < number_of_threads; ++i)
168            new CountedExitEvent(comLoadEventQueue[i],
169                "all threads reached the max load count",
170                p->max_loads_all_threads, *counter);
171    }
172
173    functionTracingEnabled = false;
174    if (p->functionTrace) {
175        functionTraceStream = simout.find(csprintf("ftrace.%s", name()));
176        currentFunctionStart = currentFunctionEnd = 0;
177        functionEntryTick = p->functionTraceStart;
178
179        if (p->functionTraceStart == 0) {
180            functionTracingEnabled = true;
181        } else {
182            Event *e =
183                new EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace>(this,
184                                                                         true);
185            e->schedule(p->functionTraceStart);
186        }
187    }
188#if FULL_SYSTEM
189    profileEvent = NULL;
190    if (params->profile)
191        profileEvent = new ProfileEvent(this, params->profile);
192#endif
193}
194
195BaseCPU::Params::Params()
196{
197#if FULL_SYSTEM
198    profile = false;
199#endif
200    checker = NULL;
201}
202
203void
204BaseCPU::enableFunctionTrace()
205{
206    functionTracingEnabled = true;
207}
208
209BaseCPU::~BaseCPU()
210{
211}
212
213void
214BaseCPU::init()
215{
216    if (!params->deferRegistration)
217        registerThreadContexts();
218}
219
220void
221BaseCPU::startup()
222{
223#if FULL_SYSTEM
224    if (!params->deferRegistration && profileEvent)
225        profileEvent->schedule(curTick);
226#endif
227
228    if (params->progress_interval) {
229        new CPUProgressEvent(&mainEventQueue, params->progress_interval,
230                             this);
231    }
232}
233
234
235void
236BaseCPU::regStats()
237{
238    using namespace Stats;
239
240    numCycles
241        .name(name() + ".numCycles")
242        .desc("number of cpu cycles simulated")
243        ;
244
245    int size = threadContexts.size();
246    if (size > 1) {
247        for (int i = 0; i < size; ++i) {
248            stringstream namestr;
249            ccprintf(namestr, "%s.ctx%d", name(), i);
250            threadContexts[i]->regStats(namestr.str());
251        }
252    } else if (size == 1)
253        threadContexts[0]->regStats(name());
254
255#if FULL_SYSTEM
256#endif
257}
258
259Tick
260BaseCPU::nextCycle()
261{
262    Tick next_tick = curTick - phase + clock - 1;
263    next_tick -= (next_tick % clock);
264    next_tick += phase;
265    return next_tick;
266}
267
268Tick
269BaseCPU::nextCycle(Tick begin_tick)
270{
271    Tick next_tick = begin_tick;
272    next_tick -= (next_tick % clock);
273    next_tick += phase;
274
275    while (next_tick < curTick)
276        next_tick += clock;
277
278    assert(next_tick >= curTick);
279    return next_tick;
280}
281
282void
283BaseCPU::registerThreadContexts()
284{
285    for (int i = 0; i < threadContexts.size(); ++i) {
286        ThreadContext *tc = threadContexts[i];
287
288#if FULL_SYSTEM
289        int id = params->cpu_id;
290        if (id != -1)
291            id += i;
292
293        tc->setCpuId(system->registerThreadContext(tc, id));
294#else
295        tc->setCpuId(tc->getProcessPtr()->registerThreadContext(tc));
296#endif
297    }
298}
299
300
301void
302BaseCPU::switchOut()
303{
304//    panic("This CPU doesn't support sampling!");
305#if FULL_SYSTEM
306    if (profileEvent && profileEvent->scheduled())
307        profileEvent->deschedule();
308#endif
309}
310
311void
312BaseCPU::takeOverFrom(BaseCPU *oldCPU)
313{
314    assert(threadContexts.size() == oldCPU->threadContexts.size());
315
316    for (int i = 0; i < threadContexts.size(); ++i) {
317        ThreadContext *newTC = threadContexts[i];
318        ThreadContext *oldTC = oldCPU->threadContexts[i];
319
320        newTC->takeOverFrom(oldTC);
321
322        CpuEvent::replaceThreadContext(oldTC, newTC);
323
324        assert(newTC->readCpuId() == oldTC->readCpuId());
325#if FULL_SYSTEM
326        system->replaceThreadContext(newTC, newTC->readCpuId());
327#else
328        assert(newTC->getProcessPtr() == oldTC->getProcessPtr());
329        newTC->getProcessPtr()->replaceThreadContext(newTC, newTC->readCpuId());
330#endif
331
332//    TheISA::compareXCs(oldXC, newXC);
333    }
334
335#if FULL_SYSTEM
336    interrupts = oldCPU->interrupts;
337    checkInterrupts = oldCPU->checkInterrupts;
338
339    for (int i = 0; i < threadContexts.size(); ++i)
340        threadContexts[i]->profileClear();
341
342    // The Sampler must take care of this!
343//    if (profileEvent)
344//        profileEvent->schedule(curTick);
345#endif
346}
347
348
349#if FULL_SYSTEM
350BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, int _interval)
351    : Event(&mainEventQueue), cpu(_cpu), interval(_interval)
352{ }
353
354void
355BaseCPU::ProfileEvent::process()
356{
357    for (int i = 0, size = cpu->threadContexts.size(); i < size; ++i) {
358        ThreadContext *tc = cpu->threadContexts[i];
359        tc->profileSample();
360    }
361
362    schedule(curTick + interval);
363}
364
365void
366BaseCPU::post_interrupt(int int_num, int index)
367{
368    checkInterrupts = true;
369    interrupts.post(int_num, index);
370}
371
372void
373BaseCPU::clear_interrupt(int int_num, int index)
374{
375    interrupts.clear(int_num, index);
376}
377
378void
379BaseCPU::clear_interrupts()
380{
381    interrupts.clear_all();
382}
383
384
385void
386BaseCPU::serialize(std::ostream &os)
387{
388    interrupts.serialize(os);
389}
390
391void
392BaseCPU::unserialize(Checkpoint *cp, const std::string &section)
393{
394    interrupts.unserialize(cp, section);
395}
396
397#endif // FULL_SYSTEM
398
399void
400BaseCPU::traceFunctionsInternal(Addr pc)
401{
402    if (!debugSymbolTable)
403        return;
404
405    // if pc enters different function, print new function symbol and
406    // update saved range.  Otherwise do nothing.
407    if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
408        string sym_str;
409        bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
410                                                         currentFunctionStart,
411                                                         currentFunctionEnd);
412
413        if (!found) {
414            // no symbol found: use addr as label
415            sym_str = csprintf("0x%x", pc);
416            currentFunctionStart = pc;
417            currentFunctionEnd = pc + 1;
418        }
419
420        ccprintf(*functionTraceStream, " (%d)\n%d: %s",
421                 curTick - functionEntryTick, curTick, sym_str);
422        functionEntryTick = curTick;
423    }
424}
425
426
427DEFINE_SIM_OBJECT_CLASS_NAME("BaseCPU", BaseCPU)
428