base.cc revision 9462:116396961ad1 
1/*
2 * Copyright (c) 2010-2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Steve Reinhardt
41 */
42
43#include "arch/kernel_stats.hh"
44#include "arch/stacktrace.hh"
45#include "arch/tlb.hh"
46#include "arch/utility.hh"
47#include "arch/vtophys.hh"
48#include "base/loader/symtab.hh"
49#include "base/cp_annotate.hh"
50#include "base/cprintf.hh"
51#include "base/inifile.hh"
52#include "base/misc.hh"
53#include "base/pollevent.hh"
54#include "base/trace.hh"
55#include "base/types.hh"
56#include "config/the_isa.hh"
57#include "cpu/simple/base.hh"
58#include "cpu/base.hh"
59#include "cpu/checker/cpu.hh"
60#include "cpu/checker/thread_context.hh"
61#include "cpu/exetrace.hh"
62#include "cpu/profile.hh"
63#include "cpu/simple_thread.hh"
64#include "cpu/smt.hh"
65#include "cpu/static_inst.hh"
66#include "cpu/thread_context.hh"
67#include "debug/Decode.hh"
68#include "debug/Fetch.hh"
69#include "debug/Quiesce.hh"
70#include "mem/mem_object.hh"
71#include "mem/packet.hh"
72#include "mem/request.hh"
73#include "params/BaseSimpleCPU.hh"
74#include "sim/byteswap.hh"
75#include "sim/debug.hh"
76#include "sim/faults.hh"
77#include "sim/full_system.hh"
78#include "sim/sim_events.hh"
79#include "sim/sim_object.hh"
80#include "sim/stats.hh"
81#include "sim/system.hh"
82
83using namespace std;
84using namespace TheISA;
85
86BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
87    : BaseCPU(p), traceData(NULL), thread(NULL)
88{
89    if (FullSystem)
90        thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb,
91                                  p->isa[0]);
92    else
93        thread = new SimpleThread(this, /* thread_num */ 0, p->system,
94                                  p->workload[0], p->itb, p->dtb, p->isa[0]);
95
96    thread->setStatus(ThreadContext::Halted);
97
98    tc = thread->getTC();
99
100    if (p->checker) {
101        BaseCPU *temp_checker = p->checker;
102        checker = dynamic_cast<CheckerCPU *>(temp_checker);
103        checker->setSystem(p->system);
104        // Manipulate thread context
105        ThreadContext *cpu_tc = tc;
106        tc = new CheckerThreadContext<ThreadContext>(cpu_tc, this->checker);
107    } else {
108        checker = NULL;
109    }
110
111    numInst = 0;
112    startNumInst = 0;
113    numOp = 0;
114    startNumOp = 0;
115    numLoad = 0;
116    startNumLoad = 0;
117    lastIcacheStall = 0;
118    lastDcacheStall = 0;
119
120    threadContexts.push_back(tc);
121
122
123    fetchOffset = 0;
124    stayAtPC = false;
125}
126
127BaseSimpleCPU::~BaseSimpleCPU()
128{
129}
130
131void
132BaseSimpleCPU::deallocateContext(ThreadID thread_num)
133{
134    // for now, these are equivalent
135    suspendContext(thread_num);
136}
137
138
139void
140BaseSimpleCPU::haltContext(ThreadID thread_num)
141{
142    // for now, these are equivalent
143    suspendContext(thread_num);
144}
145
146
147void
148BaseSimpleCPU::regStats()
149{
150    using namespace Stats;
151
152    BaseCPU::regStats();
153
154    numInsts
155        .name(name() + ".committedInsts")
156        .desc("Number of instructions committed")
157        ;
158
159    numOps
160        .name(name() + ".committedOps")
161        .desc("Number of ops (including micro ops) committed")
162        ;
163
164    numIntAluAccesses
165        .name(name() + ".num_int_alu_accesses")
166        .desc("Number of integer alu accesses")
167        ;
168
169    numFpAluAccesses
170        .name(name() + ".num_fp_alu_accesses")
171        .desc("Number of float alu accesses")
172        ;
173
174    numCallsReturns
175        .name(name() + ".num_func_calls")
176        .desc("number of times a function call or return occured")
177        ;
178
179    numCondCtrlInsts
180        .name(name() + ".num_conditional_control_insts")
181        .desc("number of instructions that are conditional controls")
182        ;
183
184    numIntInsts
185        .name(name() + ".num_int_insts")
186        .desc("number of integer instructions")
187        ;
188
189    numFpInsts
190        .name(name() + ".num_fp_insts")
191        .desc("number of float instructions")
192        ;
193
194    numIntRegReads
195        .name(name() + ".num_int_register_reads")
196        .desc("number of times the integer registers were read")
197        ;
198
199    numIntRegWrites
200        .name(name() + ".num_int_register_writes")
201        .desc("number of times the integer registers were written")
202        ;
203
204    numFpRegReads
205        .name(name() + ".num_fp_register_reads")
206        .desc("number of times the floating registers were read")
207        ;
208
209    numFpRegWrites
210        .name(name() + ".num_fp_register_writes")
211        .desc("number of times the floating registers were written")
212        ;
213
214    numMemRefs
215        .name(name()+".num_mem_refs")
216        .desc("number of memory refs")
217        ;
218
219    numStoreInsts
220        .name(name() + ".num_store_insts")
221        .desc("Number of store instructions")
222        ;
223
224    numLoadInsts
225        .name(name() + ".num_load_insts")
226        .desc("Number of load instructions")
227        ;
228
229    notIdleFraction
230        .name(name() + ".not_idle_fraction")
231        .desc("Percentage of non-idle cycles")
232        ;
233
234    idleFraction
235        .name(name() + ".idle_fraction")
236        .desc("Percentage of idle cycles")
237        ;
238
239    numBusyCycles
240        .name(name() + ".num_busy_cycles")
241        .desc("Number of busy cycles")
242        ;
243
244    numIdleCycles
245        .name(name()+".num_idle_cycles")
246        .desc("Number of idle cycles")
247        ;
248
249    icacheStallCycles
250        .name(name() + ".icache_stall_cycles")
251        .desc("ICache total stall cycles")
252        .prereq(icacheStallCycles)
253        ;
254
255    dcacheStallCycles
256        .name(name() + ".dcache_stall_cycles")
257        .desc("DCache total stall cycles")
258        .prereq(dcacheStallCycles)
259        ;
260
261    icacheRetryCycles
262        .name(name() + ".icache_retry_cycles")
263        .desc("ICache total retry cycles")
264        .prereq(icacheRetryCycles)
265        ;
266
267    dcacheRetryCycles
268        .name(name() + ".dcache_retry_cycles")
269        .desc("DCache total retry cycles")
270        .prereq(dcacheRetryCycles)
271        ;
272
273    idleFraction = constant(1.0) - notIdleFraction;
274    numIdleCycles = idleFraction * numCycles;
275    numBusyCycles = (notIdleFraction)*numCycles;
276}
277
278void
279BaseSimpleCPU::resetStats()
280{
281//    startNumInst = numInst;
282     notIdleFraction = (_status != Idle);
283}
284
285void
286BaseSimpleCPU::serializeThread(ostream &os, ThreadID tid)
287{
288    assert(_status == Idle || _status == Running);
289    assert(tid == 0);
290
291    thread->serialize(os);
292}
293
294void
295BaseSimpleCPU::unserializeThread(Checkpoint *cp, const string &section,
296                                 ThreadID tid)
297{
298    if (tid != 0)
299        fatal("Trying to load more than one thread into a SimpleCPU\n");
300    thread->unserialize(cp, section);
301}
302
303void
304change_thread_state(ThreadID tid, int activate, int priority)
305{
306}
307
308Addr
309BaseSimpleCPU::dbg_vtophys(Addr addr)
310{
311    return vtophys(tc, addr);
312}
313
314void
315BaseSimpleCPU::wakeup()
316{
317    if (thread->status() != ThreadContext::Suspended)
318        return;
319
320    DPRINTF(Quiesce,"Suspended Processor awoke\n");
321    thread->activate();
322}
323
324void
325BaseSimpleCPU::checkForInterrupts()
326{
327    if (checkInterrupts(tc)) {
328        Fault interrupt = interrupts->getInterrupt(tc);
329
330        if (interrupt != NoFault) {
331            fetchOffset = 0;
332            interrupts->updateIntrInfo(tc);
333            interrupt->invoke(tc);
334            thread->decoder.reset();
335        }
336    }
337}
338
339
340void
341BaseSimpleCPU::setupFetchRequest(Request *req)
342{
343    Addr instAddr = thread->instAddr();
344
345    // set up memory request for instruction fetch
346    DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr);
347
348    Addr fetchPC = (instAddr & PCMask) + fetchOffset;
349    req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instMasterId(),
350            instAddr);
351}
352
353
354void
355BaseSimpleCPU::preExecute()
356{
357    // maintain $r0 semantics
358    thread->setIntReg(ZeroReg, 0);
359#if THE_ISA == ALPHA_ISA
360    thread->setFloatReg(ZeroReg, 0.0);
361#endif // ALPHA_ISA
362
363    // check for instruction-count-based events
364    comInstEventQueue[0]->serviceEvents(numInst);
365    system->instEventQueue.serviceEvents(system->totalNumInsts);
366
367    // decode the instruction
368    inst = gtoh(inst);
369
370    TheISA::PCState pcState = thread->pcState();
371
372    if (isRomMicroPC(pcState.microPC())) {
373        stayAtPC = false;
374        curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(),
375                                                  curMacroStaticInst);
376    } else if (!curMacroStaticInst) {
377        //We're not in the middle of a macro instruction
378        StaticInstPtr instPtr = NULL;
379
380        TheISA::Decoder *decoder = &(thread->decoder);
381
382        //Predecode, ie bundle up an ExtMachInst
383        //If more fetch data is needed, pass it in.
384        Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset;
385        //if(decoder->needMoreBytes())
386            decoder->moreBytes(pcState, fetchPC, inst);
387        //else
388        //    decoder->process();
389
390        //Decode an instruction if one is ready. Otherwise, we'll have to
391        //fetch beyond the MachInst at the current pc.
392        instPtr = decoder->decode(pcState);
393        if (instPtr) {
394            stayAtPC = false;
395            thread->pcState(pcState);
396        } else {
397            stayAtPC = true;
398            fetchOffset += sizeof(MachInst);
399        }
400
401        //If we decoded an instruction and it's microcoded, start pulling
402        //out micro ops
403        if (instPtr && instPtr->isMacroop()) {
404            curMacroStaticInst = instPtr;
405            curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC());
406        } else {
407            curStaticInst = instPtr;
408        }
409    } else {
410        //Read the next micro op from the macro op
411        curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC());
412    }
413
414    //If we decoded an instruction this "tick", record information about it.
415    if (curStaticInst) {
416#if TRACING_ON
417        traceData = tracer->getInstRecord(curTick(), tc,
418                curStaticInst, thread->pcState(), curMacroStaticInst);
419
420        DPRINTF(Decode,"Decode: Decoded %s instruction: %#x\n",
421                curStaticInst->getName(), curStaticInst->machInst);
422#endif // TRACING_ON
423    }
424}
425
426void
427BaseSimpleCPU::postExecute()
428{
429    assert(curStaticInst);
430
431    TheISA::PCState pc = tc->pcState();
432    Addr instAddr = pc.instAddr();
433    if (FullSystem && thread->profile) {
434        bool usermode = TheISA::inUserMode(tc);
435        thread->profilePC = usermode ? 1 : instAddr;
436        ProfileNode *node = thread->profile->consume(tc, curStaticInst);
437        if (node)
438            thread->profileNode = node;
439    }
440
441    if (curStaticInst->isMemRef()) {
442        numMemRefs++;
443    }
444
445    if (curStaticInst->isLoad()) {
446        ++numLoad;
447        comLoadEventQueue[0]->serviceEvents(numLoad);
448    }
449
450    if (CPA::available()) {
451        CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr());
452    }
453
454    /* Power model statistics */
455    //integer alu accesses
456    if (curStaticInst->isInteger()){
457        numIntAluAccesses++;
458        numIntInsts++;
459    }
460
461    //float alu accesses
462    if (curStaticInst->isFloating()){
463        numFpAluAccesses++;
464        numFpInsts++;
465    }
466
467    //number of function calls/returns to get window accesses
468    if (curStaticInst->isCall() || curStaticInst->isReturn()){
469        numCallsReturns++;
470    }
471
472    //the number of branch predictions that will be made
473    if (curStaticInst->isCondCtrl()){
474        numCondCtrlInsts++;
475    }
476
477    //result bus acceses
478    if (curStaticInst->isLoad()){
479        numLoadInsts++;
480    }
481
482    if (curStaticInst->isStore()){
483        numStoreInsts++;
484    }
485    /* End power model statistics */
486
487    if (FullSystem)
488        traceFunctions(instAddr);
489
490    if (traceData) {
491        traceData->dump();
492        delete traceData;
493        traceData = NULL;
494    }
495}
496
497
498void
499BaseSimpleCPU::advancePC(Fault fault)
500{
501    //Since we're moving to a new pc, zero out the offset
502    fetchOffset = 0;
503    if (fault != NoFault) {
504        curMacroStaticInst = StaticInst::nullStaticInstPtr;
505        fault->invoke(tc, curStaticInst);
506        thread->decoder.reset();
507    } else {
508        if (curStaticInst) {
509            if (curStaticInst->isLastMicroop())
510                curMacroStaticInst = StaticInst::nullStaticInstPtr;
511            TheISA::PCState pcState = thread->pcState();
512            TheISA::advancePC(pcState, curStaticInst);
513            thread->pcState(pcState);
514        }
515    }
516}
517
518void
519BaseSimpleCPU::startup()
520{
521    BaseCPU::startup();
522    thread->startup();
523}
524