base.cc revision 2462 
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
29#include <iostream>
30#include <string>
31#include <sstream>
32
33#include "base/cprintf.hh"
34#include "base/loader/symtab.hh"
35#include "base/misc.hh"
36#include "base/output.hh"
37#include "cpu/base.hh"
38#include "cpu/exec_context.hh"
39#include "cpu/profile.hh"
40#include "cpu/sampler/sampler.hh"
41#include "sim/param.hh"
42#include "sim/process.hh"
43#include "sim/sim_events.hh"
44#include "sim/system.hh"
45
46#include "base/trace.hh"
47
48#if FULL_SYSTEM
49#include "kern/kernel_stats.hh"
50#endif
51
52using namespace std;
53
54vector<BaseCPU *> BaseCPU::cpuList;
55
56// This variable reflects the max number of threads in any CPU.  Be
57// careful to only use it once all the CPUs that you care about have
58// been initialized
59int maxThreadsPerCPU = 1;
60
61#if FULL_SYSTEM
62BaseCPU::BaseCPU(Params *p)
63    : SimObject(p->name), clock(p->clock), checkInterrupts(true),
64      params(p), number_of_threads(p->numberOfThreads), system(p->system)
65#else
66BaseCPU::BaseCPU(Params *p)
67    : SimObject(p->name), clock(p->clock), params(p),
68      number_of_threads(p->numberOfThreads), system(p->system)
69#endif
70{
71    DPRINTF(FullCPU, "BaseCPU: Creating object, mem address %#x.\n", this);
72
73    // add self to global list of CPUs
74    cpuList.push_back(this);
75
76    DPRINTF(FullCPU, "BaseCPU: CPU added to cpuList, mem address %#x.\n",
77            this);
78
79    if (number_of_threads > maxThreadsPerCPU)
80        maxThreadsPerCPU = number_of_threads;
81
82    // allocate per-thread instruction-based event queues
83    comInstEventQueue = new EventQueue *[number_of_threads];
84    for (int i = 0; i < number_of_threads; ++i)
85        comInstEventQueue[i] = new EventQueue("instruction-based event queue");
86
87    //
88    // set up instruction-count-based termination events, if any
89    //
90    if (p->max_insts_any_thread != 0)
91        for (int i = 0; i < number_of_threads; ++i)
92            new SimExitEvent(comInstEventQueue[i], p->max_insts_any_thread,
93                "a thread reached the max instruction count");
94
95    if (p->max_insts_all_threads != 0) {
96        // allocate & initialize shared downcounter: each event will
97        // decrement this when triggered; simulation will terminate
98        // when counter reaches 0
99        int *counter = new int;
100        *counter = number_of_threads;
101        for (int i = 0; i < number_of_threads; ++i)
102            new CountedExitEvent(comInstEventQueue[i],
103                "all threads reached the max instruction count",
104                p->max_insts_all_threads, *counter);
105    }
106
107    // allocate per-thread load-based event queues
108    comLoadEventQueue = new EventQueue *[number_of_threads];
109    for (int i = 0; i < number_of_threads; ++i)
110        comLoadEventQueue[i] = new EventQueue("load-based event queue");
111
112    //
113    // set up instruction-count-based termination events, if any
114    //
115    if (p->max_loads_any_thread != 0)
116        for (int i = 0; i < number_of_threads; ++i)
117            new SimExitEvent(comLoadEventQueue[i], p->max_loads_any_thread,
118                "a thread reached the max load count");
119
120    if (p->max_loads_all_threads != 0) {
121        // allocate & initialize shared downcounter: each event will
122        // decrement this when triggered; simulation will terminate
123        // when counter reaches 0
124        int *counter = new int;
125        *counter = number_of_threads;
126        for (int i = 0; i < number_of_threads; ++i)
127            new CountedExitEvent(comLoadEventQueue[i],
128                "all threads reached the max load count",
129                p->max_loads_all_threads, *counter);
130    }
131
132#if FULL_SYSTEM
133    memset(interrupts, 0, sizeof(interrupts));
134    intstatus = 0;
135#endif
136
137    functionTracingEnabled = false;
138    if (p->functionTrace) {
139        functionTraceStream = simout.find(csprintf("ftrace.%s", name()));
140        currentFunctionStart = currentFunctionEnd = 0;
141        functionEntryTick = p->functionTraceStart;
142
143        if (p->functionTraceStart == 0) {
144            functionTracingEnabled = true;
145        } else {
146            Event *e =
147                new EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace>(this,
148                                                                         true);
149            e->schedule(p->functionTraceStart);
150        }
151    }
152#if FULL_SYSTEM
153    profileEvent = NULL;
154    if (params->profile)
155        profileEvent = new ProfileEvent(this, params->profile);
156
157    kernelStats = new Kernel::Statistics(system);
158#endif
159
160}
161
162BaseCPU::Params::Params()
163{
164#if FULL_SYSTEM
165    profile = false;
166#endif
167}
168
169void
170BaseCPU::enableFunctionTrace()
171{
172    functionTracingEnabled = true;
173}
174
175BaseCPU::~BaseCPU()
176{
177#if FULL_SYSTEM
178    if (kernelStats)
179        delete kernelStats;
180#endif
181}
182
183void
184BaseCPU::init()
185{
186    if (!params->deferRegistration)
187        registerExecContexts();
188}
189
190void
191BaseCPU::startup()
192{
193#if FULL_SYSTEM
194    if (!params->deferRegistration && profileEvent)
195        profileEvent->schedule(curTick);
196#endif
197}
198
199
200void
201BaseCPU::regStats()
202{
203    using namespace Stats;
204
205    numCycles
206        .name(name() + ".numCycles")
207        .desc("number of cpu cycles simulated")
208        ;
209
210    int size = execContexts.size();
211    if (size > 1) {
212        for (int i = 0; i < size; ++i) {
213            stringstream namestr;
214            ccprintf(namestr, "%s.ctx%d", name(), i);
215            execContexts[i]->regStats(namestr.str());
216        }
217    } else if (size == 1)
218        execContexts[0]->regStats(name());
219
220#if FULL_SYSTEM
221    if (kernelStats)
222        kernelStats->regStats(name() + ".kern");
223#endif
224}
225
226
227void
228BaseCPU::registerExecContexts()
229{
230    for (int i = 0; i < execContexts.size(); ++i) {
231        ExecContext *xc = execContexts[i];
232
233#if FULL_SYSTEM
234        int id = params->cpu_id;
235        if (id != -1)
236            id += i;
237
238        xc->setCpuId(system->registerExecContext(xc, id));
239#else
240        xc->setCpuId(xc->getProcessPtr()->registerExecContext(xc));
241#endif
242    }
243}
244
245
246void
247BaseCPU::switchOut(Sampler *sampler)
248{
249    panic("This CPU doesn't support sampling!");
250}
251
252void
253BaseCPU::takeOverFrom(BaseCPU *oldCPU)
254{
255    assert(execContexts.size() == oldCPU->execContexts.size());
256
257    for (int i = 0; i < execContexts.size(); ++i) {
258        ExecContext *newXC = execContexts[i];
259        ExecContext *oldXC = oldCPU->execContexts[i];
260
261        newXC->takeOverFrom(oldXC);
262        assert(newXC->readCpuId() == oldXC->readCpuId());
263#if FULL_SYSTEM
264        system->replaceExecContext(newXC, newXC->readCpuId());
265#else
266        assert(newXC->getProcessPtr() == oldXC->getProcessPtr());
267        newXC->getProcessPtr()->replaceExecContext(newXC, newXC->readCpuId());
268#endif
269    }
270
271#if FULL_SYSTEM
272    for (int i = 0; i < TheISA::NumInterruptLevels; ++i)
273        interrupts[i] = oldCPU->interrupts[i];
274    intstatus = oldCPU->intstatus;
275
276    for (int i = 0; i < execContexts.size(); ++i)
277        execContexts[i]->profileClear();
278
279    if (profileEvent)
280        profileEvent->schedule(curTick);
281#endif
282}
283
284
285#if FULL_SYSTEM
286BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, int _interval)
287    : Event(&mainEventQueue), cpu(_cpu), interval(_interval)
288{ }
289
290void
291BaseCPU::ProfileEvent::process()
292{
293    for (int i = 0, size = cpu->execContexts.size(); i < size; ++i) {
294        ExecContext *xc = cpu->execContexts[i];
295        xc->profileSample();
296    }
297
298    schedule(curTick + interval);
299}
300
301void
302BaseCPU::post_interrupt(int int_num, int index)
303{
304    DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
305
306    if (int_num < 0 || int_num >= TheISA::NumInterruptLevels)
307        panic("int_num out of bounds\n");
308
309    if (index < 0 || index >= sizeof(uint64_t) * 8)
310        panic("int_num out of bounds\n");
311
312    checkInterrupts = true;
313    interrupts[int_num] |= 1 << index;
314    intstatus |= (ULL(1) << int_num);
315}
316
317void
318BaseCPU::clear_interrupt(int int_num, int index)
319{
320    DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
321
322    if (int_num < 0 || int_num >= TheISA::NumInterruptLevels)
323        panic("int_num out of bounds\n");
324
325    if (index < 0 || index >= sizeof(uint64_t) * 8)
326        panic("int_num out of bounds\n");
327
328    interrupts[int_num] &= ~(1 << index);
329    if (interrupts[int_num] == 0)
330        intstatus &= ~(ULL(1) << int_num);
331}
332
333void
334BaseCPU::clear_interrupts()
335{
336    DPRINTF(Interrupt, "Interrupts all cleared\n");
337
338    memset(interrupts, 0, sizeof(interrupts));
339    intstatus = 0;
340}
341
342
343void
344BaseCPU::serialize(std::ostream &os)
345{
346    SERIALIZE_ARRAY(interrupts, TheISA::NumInterruptLevels);
347    SERIALIZE_SCALAR(intstatus);
348
349#if FULL_SYSTEM
350    if (kernelStats)
351        kernelStats->serialize(os);
352#endif
353
354}
355
356void
357BaseCPU::unserialize(Checkpoint *cp, const std::string &section)
358{
359    UNSERIALIZE_ARRAY(interrupts, TheISA::NumInterruptLevels);
360    UNSERIALIZE_SCALAR(intstatus);
361
362#if FULL_SYSTEM
363    if (kernelStats)
364        kernelStats->unserialize(cp, section);
365#endif
366}
367
368#endif // FULL_SYSTEM
369
370void
371BaseCPU::traceFunctionsInternal(Addr pc)
372{
373    if (!debugSymbolTable)
374        return;
375
376    // if pc enters different function, print new function symbol and
377    // update saved range.  Otherwise do nothing.
378    if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
379        string sym_str;
380        bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
381                                                         currentFunctionStart,
382                                                         currentFunctionEnd);
383
384        if (!found) {
385            // no symbol found: use addr as label
386            sym_str = csprintf("0x%x", pc);
387            currentFunctionStart = pc;
388            currentFunctionEnd = pc + 1;
389        }
390
391        ccprintf(*functionTraceStream, " (%d)\n%d: %s",
392                 curTick - functionEntryTick, curTick, sym_str);
393        functionEntryTick = curTick;
394    }
395}
396
397
398DEFINE_SIM_OBJECT_CLASS_NAME("BaseCPU", BaseCPU)
399