base.cc revision 8780:89e0822462a1 
1/*
2 * Copyright (c) 2010 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/faults.hh"
44#include "arch/kernel_stats.hh"
45#include "arch/stacktrace.hh"
46#include "arch/tlb.hh"
47#include "arch/utility.hh"
48#include "arch/vtophys.hh"
49#include "base/loader/symtab.hh"
50#include "base/cp_annotate.hh"
51#include "base/cprintf.hh"
52#include "base/inifile.hh"
53#include "base/misc.hh"
54#include "base/pollevent.hh"
55#include "base/range.hh"
56#include "base/trace.hh"
57#include "base/types.hh"
58#include "config/the_isa.hh"
59#include "cpu/simple/base.hh"
60#include "cpu/base.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/sim_events.hh"
77#include "sim/sim_object.hh"
78#include "sim/stats.hh"
79#include "sim/system.hh"
80
81using namespace std;
82using namespace TheISA;
83
84BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
85    : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL)
86{
87#if FULL_SYSTEM
88    thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
89#else
90    thread = new SimpleThread(this, /* thread_num */ 0, p->workload[0],
91            p->itb, p->dtb);
92#endif // !FULL_SYSTEM
93
94    thread->setStatus(ThreadContext::Halted);
95
96    tc = thread->getTC();
97
98    numInst = 0;
99    startNumInst = 0;
100    numLoad = 0;
101    startNumLoad = 0;
102    lastIcacheStall = 0;
103    lastDcacheStall = 0;
104
105    threadContexts.push_back(tc);
106
107
108    fetchOffset = 0;
109    stayAtPC = false;
110}
111
112BaseSimpleCPU::~BaseSimpleCPU()
113{
114}
115
116void
117BaseSimpleCPU::deallocateContext(int thread_num)
118{
119    // for now, these are equivalent
120    suspendContext(thread_num);
121}
122
123
124void
125BaseSimpleCPU::haltContext(int thread_num)
126{
127    // for now, these are equivalent
128    suspendContext(thread_num);
129}
130
131
132void
133BaseSimpleCPU::regStats()
134{
135    using namespace Stats;
136
137    BaseCPU::regStats();
138
139    numInsts
140        .name(name() + ".num_insts")
141        .desc("Number of instructions executed")
142        ;
143
144    numIntAluAccesses
145        .name(name() + ".num_int_alu_accesses")
146        .desc("Number of integer alu accesses")
147        ;
148
149    numFpAluAccesses
150        .name(name() + ".num_fp_alu_accesses")
151        .desc("Number of float alu accesses")
152        ;
153
154    numCallsReturns
155        .name(name() + ".num_func_calls")
156        .desc("number of times a function call or return occured")
157        ;
158
159    numCondCtrlInsts
160        .name(name() + ".num_conditional_control_insts")
161        .desc("number of instructions that are conditional controls")
162        ;
163
164    numIntInsts
165        .name(name() + ".num_int_insts")
166        .desc("number of integer instructions")
167        ;
168
169    numFpInsts
170        .name(name() + ".num_fp_insts")
171        .desc("number of float instructions")
172        ;
173
174    numIntRegReads
175        .name(name() + ".num_int_register_reads")
176        .desc("number of times the integer registers were read")
177        ;
178
179    numIntRegWrites
180        .name(name() + ".num_int_register_writes")
181        .desc("number of times the integer registers were written")
182        ;
183
184    numFpRegReads
185        .name(name() + ".num_fp_register_reads")
186        .desc("number of times the floating registers were read")
187        ;
188
189    numFpRegWrites
190        .name(name() + ".num_fp_register_writes")
191        .desc("number of times the floating registers were written")
192        ;
193
194    numMemRefs
195        .name(name()+".num_mem_refs")
196        .desc("number of memory refs")
197        ;
198
199    numStoreInsts
200        .name(name() + ".num_store_insts")
201        .desc("Number of store instructions")
202        ;
203
204    numLoadInsts
205        .name(name() + ".num_load_insts")
206        .desc("Number of load instructions")
207        ;
208
209    notIdleFraction
210        .name(name() + ".not_idle_fraction")
211        .desc("Percentage of non-idle cycles")
212        ;
213
214    idleFraction
215        .name(name() + ".idle_fraction")
216        .desc("Percentage of idle cycles")
217        ;
218
219    numBusyCycles
220        .name(name() + ".num_busy_cycles")
221        .desc("Number of busy cycles")
222        ;
223
224    numIdleCycles
225        .name(name()+".num_idle_cycles")
226        .desc("Number of idle cycles")
227        ;
228
229    icacheStallCycles
230        .name(name() + ".icache_stall_cycles")
231        .desc("ICache total stall cycles")
232        .prereq(icacheStallCycles)
233        ;
234
235    dcacheStallCycles
236        .name(name() + ".dcache_stall_cycles")
237        .desc("DCache total stall cycles")
238        .prereq(dcacheStallCycles)
239        ;
240
241    icacheRetryCycles
242        .name(name() + ".icache_retry_cycles")
243        .desc("ICache total retry cycles")
244        .prereq(icacheRetryCycles)
245        ;
246
247    dcacheRetryCycles
248        .name(name() + ".dcache_retry_cycles")
249        .desc("DCache total retry cycles")
250        .prereq(dcacheRetryCycles)
251        ;
252
253    idleFraction = constant(1.0) - notIdleFraction;
254    numIdleCycles = idleFraction * numCycles;
255    numBusyCycles = (notIdleFraction)*numCycles;
256}
257
258void
259BaseSimpleCPU::resetStats()
260{
261//    startNumInst = numInst;
262     notIdleFraction = (_status != Idle);
263}
264
265void
266BaseSimpleCPU::serialize(ostream &os)
267{
268    SERIALIZE_ENUM(_status);
269    BaseCPU::serialize(os);
270//    SERIALIZE_SCALAR(inst);
271    nameOut(os, csprintf("%s.xc.0", name()));
272    thread->serialize(os);
273}
274
275void
276BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
277{
278    UNSERIALIZE_ENUM(_status);
279    BaseCPU::unserialize(cp, section);
280//    UNSERIALIZE_SCALAR(inst);
281    thread->unserialize(cp, csprintf("%s.xc.0", section));
282}
283
284void
285change_thread_state(ThreadID tid, int activate, int priority)
286{
287}
288
289Addr
290BaseSimpleCPU::dbg_vtophys(Addr addr)
291{
292    return vtophys(tc, addr);
293}
294
295void
296BaseSimpleCPU::wakeup()
297{
298    if (thread->status() != ThreadContext::Suspended)
299        return;
300
301    DPRINTF(Quiesce,"Suspended Processor awoke\n");
302    thread->activate();
303}
304
305void
306BaseSimpleCPU::checkForInterrupts()
307{
308    if (checkInterrupts(tc)) {
309        Fault interrupt = interrupts->getInterrupt(tc);
310
311        if (interrupt != NoFault) {
312            fetchOffset = 0;
313            interrupts->updateIntrInfo(tc);
314            interrupt->invoke(tc);
315            predecoder.reset();
316        }
317    }
318}
319
320
321void
322BaseSimpleCPU::setupFetchRequest(Request *req)
323{
324    Addr instAddr = thread->instAddr();
325
326    // set up memory request for instruction fetch
327    DPRINTF(Fetch, "Fetch: PC:%08p\n", instAddr);
328
329    Addr fetchPC = (instAddr & PCMask) + fetchOffset;
330    req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, instAddr);
331}
332
333
334void
335BaseSimpleCPU::preExecute()
336{
337    // maintain $r0 semantics
338    thread->setIntReg(ZeroReg, 0);
339#if THE_ISA == ALPHA_ISA
340    thread->setFloatReg(ZeroReg, 0.0);
341#endif // ALPHA_ISA
342
343    // check for instruction-count-based events
344    comInstEventQueue[0]->serviceEvents(numInst);
345    system->instEventQueue.serviceEvents(system->totalNumInsts);
346
347    // decode the instruction
348    inst = gtoh(inst);
349
350    TheISA::PCState pcState = thread->pcState();
351
352    if (isRomMicroPC(pcState.microPC())) {
353        stayAtPC = false;
354        curStaticInst = microcodeRom.fetchMicroop(pcState.microPC(),
355                                                  curMacroStaticInst);
356    } else if (!curMacroStaticInst) {
357        //We're not in the middle of a macro instruction
358        StaticInstPtr instPtr = NULL;
359
360        //Predecode, ie bundle up an ExtMachInst
361        //This should go away once the constructor can be set up properly
362        predecoder.setTC(thread->getTC());
363        //If more fetch data is needed, pass it in.
364        Addr fetchPC = (pcState.instAddr() & PCMask) + fetchOffset;
365        //if(predecoder.needMoreBytes())
366            predecoder.moreBytes(pcState, fetchPC, inst);
367        //else
368        //    predecoder.process();
369
370        //If an instruction is ready, decode it. Otherwise, we'll have to
371        //fetch beyond the MachInst at the current pc.
372        if (predecoder.extMachInstReady()) {
373            stayAtPC = false;
374            ExtMachInst machInst = predecoder.getExtMachInst(pcState);
375            thread->pcState(pcState);
376            instPtr = thread->decoder.decode(machInst, pcState.instAddr());
377        } else {
378            stayAtPC = true;
379            fetchOffset += sizeof(MachInst);
380        }
381
382        //If we decoded an instruction and it's microcoded, start pulling
383        //out micro ops
384        if (instPtr && instPtr->isMacroop()) {
385            curMacroStaticInst = instPtr;
386            curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC());
387        } else {
388            curStaticInst = instPtr;
389        }
390    } else {
391        //Read the next micro op from the macro op
392        curStaticInst = curMacroStaticInst->fetchMicroop(pcState.microPC());
393    }
394
395    //If we decoded an instruction this "tick", record information about it.
396    if(curStaticInst)
397    {
398#if TRACING_ON
399        traceData = tracer->getInstRecord(curTick(), tc,
400                curStaticInst, thread->pcState(), curMacroStaticInst);
401
402        DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
403                curStaticInst->getName(), curStaticInst->machInst);
404#endif // TRACING_ON
405    }
406}
407
408void
409BaseSimpleCPU::postExecute()
410{
411    assert(curStaticInst);
412
413    TheISA::PCState pc = tc->pcState();
414    Addr instAddr = pc.instAddr();
415    if (FullSystem && thread->profile) {
416        bool usermode = TheISA::inUserMode(tc);
417        thread->profilePC = usermode ? 1 : instAddr;
418        ProfileNode *node = thread->profile->consume(tc, curStaticInst);
419        if (node)
420            thread->profileNode = node;
421    }
422
423    if (curStaticInst->isMemRef()) {
424        numMemRefs++;
425    }
426
427    if (curStaticInst->isLoad()) {
428        ++numLoad;
429        comLoadEventQueue[0]->serviceEvents(numLoad);
430    }
431
432    if (CPA::available()) {
433        CPA::cpa()->swAutoBegin(tc, pc.nextInstAddr());
434    }
435
436    /* Power model statistics */
437    //integer alu accesses
438    if (curStaticInst->isInteger()){
439        numIntAluAccesses++;
440        numIntInsts++;
441    }
442
443    //float alu accesses
444    if (curStaticInst->isFloating()){
445        numFpAluAccesses++;
446        numFpInsts++;
447    }
448
449    //number of function calls/returns to get window accesses
450    if (curStaticInst->isCall() || curStaticInst->isReturn()){
451        numCallsReturns++;
452    }
453
454    //the number of branch predictions that will be made
455    if (curStaticInst->isCondCtrl()){
456        numCondCtrlInsts++;
457    }
458
459    //result bus acceses
460    if (curStaticInst->isLoad()){
461        numLoadInsts++;
462    }
463
464    if (curStaticInst->isStore()){
465        numStoreInsts++;
466    }
467    /* End power model statistics */
468
469    if (FullSystem)
470        traceFunctions(instAddr);
471
472    if (traceData) {
473        traceData->dump();
474        delete traceData;
475        traceData = NULL;
476    }
477}
478
479
480void
481BaseSimpleCPU::advancePC(Fault fault)
482{
483    //Since we're moving to a new pc, zero out the offset
484    fetchOffset = 0;
485    if (fault != NoFault) {
486        curMacroStaticInst = StaticInst::nullStaticInstPtr;
487        fault->invoke(tc, curStaticInst);
488        predecoder.reset();
489    } else {
490        if (curStaticInst) {
491            if (curStaticInst->isLastMicroop())
492                curMacroStaticInst = StaticInst::nullStaticInstPtr;
493            TheISA::PCState pcState = thread->pcState();
494            TheISA::advancePC(pcState, curStaticInst);
495            thread->pcState(pcState);
496        }
497    }
498}
499
500/*Fault
501BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr)
502{
503    // translate to physical address
504    Fault fault = NoFault;
505    int CacheID = Op & 0x3; // Lower 3 bits identify Cache
506    int CacheOP = Op >> 2; // Upper 3 bits identify Cache Operation
507    if(CacheID > 1)
508      {
509        warn("CacheOps not implemented for secondary/tertiary caches\n");
510      }
511    else
512      {
513        switch(CacheOP)
514          { // Fill Packet Type
515          case 0: warn("Invalidate Cache Op\n");
516            break;
517          case 1: warn("Index Load Tag Cache Op\n");
518            break;
519          case 2: warn("Index Store Tag Cache Op\n");
520            break;
521          case 4: warn("Hit Invalidate Cache Op\n");
522            break;
523          case 5: warn("Fill/Hit Writeback Invalidate Cache Op\n");
524            break;
525          case 6: warn("Hit Writeback\n");
526            break;
527          case 7: warn("Fetch & Lock Cache Op\n");
528            break;
529          default: warn("Unimplemented Cache Op\n");
530          }
531      }
532    return fault;
533}*/
534