base.cc revision 7045 
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 */
30
31#include "arch/faults.hh"
32#include "arch/utility.hh"
33#include "base/cp_annotate.hh"
34#include "base/cprintf.hh"
35#include "base/inifile.hh"
36#include "base/loader/symtab.hh"
37#include "base/misc.hh"
38#include "base/pollevent.hh"
39#include "base/range.hh"
40#include "base/stats/events.hh"
41#include "base/trace.hh"
42#include "base/types.hh"
43#include "config/the_isa.hh"
44#include "cpu/base.hh"
45#include "cpu/exetrace.hh"
46#include "cpu/profile.hh"
47#include "cpu/simple/base.hh"
48#include "cpu/simple_thread.hh"
49#include "cpu/smt.hh"
50#include "cpu/static_inst.hh"
51#include "cpu/thread_context.hh"
52#include "mem/packet.hh"
53#include "mem/request.hh"
54#include "params/BaseSimpleCPU.hh"
55#include "sim/byteswap.hh"
56#include "sim/debug.hh"
57#include "sim/sim_events.hh"
58#include "sim/sim_object.hh"
59#include "sim/stats.hh"
60#include "sim/system.hh"
61
62#if FULL_SYSTEM
63#include "arch/kernel_stats.hh"
64#include "arch/stacktrace.hh"
65#include "arch/tlb.hh"
66#include "arch/vtophys.hh"
67#include "base/remote_gdb.hh"
68#else // !FULL_SYSTEM
69#include "mem/mem_object.hh"
70#endif // FULL_SYSTEM
71
72using namespace std;
73using namespace TheISA;
74
75BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
76    : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL)
77{
78#if FULL_SYSTEM
79    thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
80#else
81    thread = new SimpleThread(this, /* thread_num */ 0, p->workload[0],
82            p->itb, p->dtb);
83#endif // !FULL_SYSTEM
84
85    thread->setStatus(ThreadContext::Halted);
86
87    tc = thread->getTC();
88
89    numInst = 0;
90    startNumInst = 0;
91    numLoad = 0;
92    startNumLoad = 0;
93    lastIcacheStall = 0;
94    lastDcacheStall = 0;
95
96    threadContexts.push_back(tc);
97
98
99    fetchOffset = 0;
100    stayAtPC = false;
101}
102
103BaseSimpleCPU::~BaseSimpleCPU()
104{
105}
106
107void
108BaseSimpleCPU::deallocateContext(int thread_num)
109{
110    // for now, these are equivalent
111    suspendContext(thread_num);
112}
113
114
115void
116BaseSimpleCPU::haltContext(int thread_num)
117{
118    // for now, these are equivalent
119    suspendContext(thread_num);
120}
121
122
123void
124BaseSimpleCPU::regStats()
125{
126    using namespace Stats;
127
128    BaseCPU::regStats();
129
130    numInsts
131        .name(name() + ".num_insts")
132        .desc("Number of instructions executed")
133        ;
134
135    numMemRefs
136        .name(name() + ".num_refs")
137        .desc("Number of memory references")
138        ;
139
140    notIdleFraction
141        .name(name() + ".not_idle_fraction")
142        .desc("Percentage of non-idle cycles")
143        ;
144
145    idleFraction
146        .name(name() + ".idle_fraction")
147        .desc("Percentage of idle cycles")
148        ;
149
150    icacheStallCycles
151        .name(name() + ".icache_stall_cycles")
152        .desc("ICache total stall cycles")
153        .prereq(icacheStallCycles)
154        ;
155
156    dcacheStallCycles
157        .name(name() + ".dcache_stall_cycles")
158        .desc("DCache total stall cycles")
159        .prereq(dcacheStallCycles)
160        ;
161
162    icacheRetryCycles
163        .name(name() + ".icache_retry_cycles")
164        .desc("ICache total retry cycles")
165        .prereq(icacheRetryCycles)
166        ;
167
168    dcacheRetryCycles
169        .name(name() + ".dcache_retry_cycles")
170        .desc("DCache total retry cycles")
171        .prereq(dcacheRetryCycles)
172        ;
173
174    idleFraction = constant(1.0) - notIdleFraction;
175}
176
177void
178BaseSimpleCPU::resetStats()
179{
180//    startNumInst = numInst;
181     notIdleFraction = (_status != Idle);
182}
183
184void
185BaseSimpleCPU::serialize(ostream &os)
186{
187    SERIALIZE_ENUM(_status);
188    BaseCPU::serialize(os);
189//    SERIALIZE_SCALAR(inst);
190    nameOut(os, csprintf("%s.xc.0", name()));
191    thread->serialize(os);
192}
193
194void
195BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
196{
197    UNSERIALIZE_ENUM(_status);
198    BaseCPU::unserialize(cp, section);
199//    UNSERIALIZE_SCALAR(inst);
200    thread->unserialize(cp, csprintf("%s.xc.0", section));
201}
202
203void
204change_thread_state(ThreadID tid, int activate, int priority)
205{
206}
207
208void
209BaseSimpleCPU::prefetch(Addr addr, unsigned flags)
210{
211    if (traceData) {
212        traceData->setAddr(addr);
213    }
214
215    // need to do this...
216}
217
218void
219BaseSimpleCPU::writeHint(Addr addr, int size, unsigned flags)
220{
221    if (traceData) {
222        traceData->setAddr(addr);
223    }
224
225    // need to do this...
226}
227
228
229Fault
230BaseSimpleCPU::copySrcTranslate(Addr src)
231{
232#if 0
233    static bool no_warn = true;
234    unsigned blk_size =
235        (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
236    // Only support block sizes of 64 atm.
237    assert(blk_size == 64);
238    int offset = src & (blk_size - 1);
239
240    // Make sure block doesn't span page
241    if (no_warn &&
242        (src & PageMask) != ((src + blk_size) & PageMask) &&
243        (src >> 40) != 0xfffffc) {
244        warn("Copied block source spans pages %x.", src);
245        no_warn = false;
246    }
247
248    memReq->reset(src & ~(blk_size - 1), blk_size);
249
250    // translate to physical address
251    Fault fault = thread->translateDataReadReq(req);
252
253    if (fault == NoFault) {
254        thread->copySrcAddr = src;
255        thread->copySrcPhysAddr = memReq->paddr + offset;
256    } else {
257        assert(!fault->isAlignmentFault());
258
259        thread->copySrcAddr = 0;
260        thread->copySrcPhysAddr = 0;
261    }
262    return fault;
263#else
264    return NoFault;
265#endif
266}
267
268Fault
269BaseSimpleCPU::copy(Addr dest)
270{
271#if 0
272    static bool no_warn = true;
273    unsigned blk_size =
274        (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
275    // Only support block sizes of 64 atm.
276    assert(blk_size == 64);
277    uint8_t data[blk_size];
278    //assert(thread->copySrcAddr);
279    int offset = dest & (blk_size - 1);
280
281    // Make sure block doesn't span page
282    if (no_warn &&
283        (dest & PageMask) != ((dest + blk_size) & PageMask) &&
284        (dest >> 40) != 0xfffffc) {
285        no_warn = false;
286        warn("Copied block destination spans pages %x. ", dest);
287    }
288
289    memReq->reset(dest & ~(blk_size -1), blk_size);
290    // translate to physical address
291    Fault fault = thread->translateDataWriteReq(req);
292
293    if (fault == NoFault) {
294        Addr dest_addr = memReq->paddr + offset;
295        // Need to read straight from memory since we have more than 8 bytes.
296        memReq->paddr = thread->copySrcPhysAddr;
297        thread->mem->read(memReq, data);
298        memReq->paddr = dest_addr;
299        thread->mem->write(memReq, data);
300        if (dcacheInterface) {
301            memReq->cmd = Copy;
302            memReq->completionEvent = NULL;
303            memReq->paddr = thread->copySrcPhysAddr;
304            memReq->dest = dest_addr;
305            memReq->size = 64;
306            memReq->time = curTick;
307            dcacheInterface->access(memReq);
308        }
309    }
310    else
311        assert(!fault->isAlignmentFault());
312
313    return fault;
314#else
315    panic("copy not implemented");
316    return NoFault;
317#endif
318}
319
320#if FULL_SYSTEM
321Addr
322BaseSimpleCPU::dbg_vtophys(Addr addr)
323{
324    return vtophys(tc, addr);
325}
326#endif // FULL_SYSTEM
327
328#if FULL_SYSTEM
329void
330BaseSimpleCPU::wakeup()
331{
332    if (thread->status() != ThreadContext::Suspended)
333        return;
334
335    DPRINTF(Quiesce,"Suspended Processor awoke\n");
336    thread->activate();
337}
338#endif // FULL_SYSTEM
339
340void
341BaseSimpleCPU::checkForInterrupts()
342{
343#if FULL_SYSTEM
344    if (checkInterrupts(tc)) {
345        Fault interrupt = interrupts->getInterrupt(tc);
346
347        if (interrupt != NoFault) {
348            predecoder.reset();
349            interrupts->updateIntrInfo(tc);
350            interrupt->invoke(tc);
351        }
352    }
353#endif
354}
355
356
357void
358BaseSimpleCPU::setupFetchRequest(Request *req)
359{
360    Addr threadPC = thread->readPC();
361
362    // set up memory request for instruction fetch
363#if ISA_HAS_DELAY_SLOT
364    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",threadPC,
365            thread->readNextPC(),thread->readNextNPC());
366#else
367    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p\n",threadPC,
368            thread->readNextPC());
369#endif
370
371    Addr fetchPC = (threadPC & PCMask) + fetchOffset;
372    req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, threadPC);
373}
374
375
376void
377BaseSimpleCPU::preExecute()
378{
379    // maintain $r0 semantics
380    thread->setIntReg(ZeroReg, 0);
381#if THE_ISA == ALPHA_ISA
382    thread->setFloatReg(ZeroReg, 0.0);
383#endif // ALPHA_ISA
384
385    // check for instruction-count-based events
386    comInstEventQueue[0]->serviceEvents(numInst);
387
388    // decode the instruction
389    inst = gtoh(inst);
390
391    MicroPC upc = thread->readMicroPC();
392
393    if (isRomMicroPC(upc)) {
394        stayAtPC = false;
395        curStaticInst = microcodeRom.fetchMicroop(upc, curMacroStaticInst);
396    } else if (!curMacroStaticInst) {
397        //We're not in the middle of a macro instruction
398        StaticInstPtr instPtr = NULL;
399
400        //Predecode, ie bundle up an ExtMachInst
401        //This should go away once the constructor can be set up properly
402        predecoder.setTC(thread->getTC());
403        //If more fetch data is needed, pass it in.
404        Addr fetchPC = (thread->readPC() & PCMask) + fetchOffset;
405        //if(predecoder.needMoreBytes())
406            predecoder.moreBytes(thread->readPC(), fetchPC, inst);
407        //else
408        //    predecoder.process();
409
410        //If an instruction is ready, decode it. Otherwise, we'll have to
411        //fetch beyond the MachInst at the current pc.
412        if (predecoder.extMachInstReady()) {
413#if THE_ISA == X86_ISA
414            thread->setNextPC(thread->readPC() + predecoder.getInstSize());
415#endif // X86_ISA
416            stayAtPC = false;
417            instPtr = StaticInst::decode(predecoder.getExtMachInst(),
418                                         thread->readPC());
419        } else {
420            stayAtPC = true;
421            fetchOffset += sizeof(MachInst);
422        }
423
424        //If we decoded an instruction and it's microcoded, start pulling
425        //out micro ops
426        if (instPtr && instPtr->isMacroop()) {
427            curMacroStaticInst = instPtr;
428            curStaticInst = curMacroStaticInst->fetchMicroop(upc);
429        } else {
430            curStaticInst = instPtr;
431        }
432    } else {
433        //Read the next micro op from the macro op
434        curStaticInst = curMacroStaticInst->fetchMicroop(upc);
435    }
436
437    //If we decoded an instruction this "tick", record information about it.
438    if(curStaticInst)
439    {
440#if TRACING_ON
441        traceData = tracer->getInstRecord(curTick, tc,
442                curStaticInst, thread->readPC(),
443                curMacroStaticInst, thread->readMicroPC());
444
445        DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
446                curStaticInst->getName(), curStaticInst->machInst);
447#endif // TRACING_ON
448
449#if FULL_SYSTEM
450        thread->setInst(inst);
451#endif // FULL_SYSTEM
452    }
453}
454
455void
456BaseSimpleCPU::postExecute()
457{
458#if FULL_SYSTEM
459    if (thread->profile && curStaticInst) {
460        bool usermode = TheISA::inUserMode(tc);
461        thread->profilePC = usermode ? 1 : thread->readPC();
462        ProfileNode *node = thread->profile->consume(tc, curStaticInst);
463        if (node)
464            thread->profileNode = node;
465    }
466#endif
467
468    if (curStaticInst->isMemRef()) {
469        numMemRefs++;
470    }
471
472    if (curStaticInst->isLoad()) {
473        ++numLoad;
474        comLoadEventQueue[0]->serviceEvents(numLoad);
475    }
476
477    if (CPA::available()) {
478        CPA::cpa()->swAutoBegin(tc, thread->readNextPC());
479    }
480
481    traceFunctions(thread->readPC());
482
483    if (traceData) {
484        traceData->dump();
485        delete traceData;
486        traceData = NULL;
487    }
488}
489
490
491void
492BaseSimpleCPU::advancePC(Fault fault)
493{
494    //Since we're moving to a new pc, zero out the offset
495    fetchOffset = 0;
496    if (fault != NoFault) {
497        curMacroStaticInst = StaticInst::nullStaticInstPtr;
498        predecoder.reset();
499        fault->invoke(tc);
500    } else {
501        //If we're at the last micro op for this instruction
502        if (curStaticInst && curStaticInst->isLastMicroop()) {
503            //We should be working with a macro op or be in the ROM
504            assert(curMacroStaticInst ||
505                    isRomMicroPC(thread->readMicroPC()));
506            //Close out this macro op, and clean up the
507            //microcode state
508            curMacroStaticInst = StaticInst::nullStaticInstPtr;
509            thread->setMicroPC(normalMicroPC(0));
510            thread->setNextMicroPC(normalMicroPC(1));
511        }
512        //If we're still in a macro op
513        if (curMacroStaticInst || isRomMicroPC(thread->readMicroPC())) {
514            //Advance the micro pc
515            thread->setMicroPC(thread->readNextMicroPC());
516            //Advance the "next" micro pc. Note that there are no delay
517            //slots, and micro ops are "word" addressed.
518            thread->setNextMicroPC(thread->readNextMicroPC() + 1);
519        } else {
520            // go to the next instruction
521            thread->setPC(thread->readNextPC());
522            thread->setNextPC(thread->readNextNPC());
523            thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
524            assert(thread->readNextPC() != thread->readNextNPC());
525        }
526    }
527}
528
529/*Fault
530BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr)
531{
532    // translate to physical address
533    Fault fault = NoFault;
534    int CacheID = Op & 0x3; // Lower 3 bits identify Cache
535    int CacheOP = Op >> 2; // Upper 3 bits identify Cache Operation
536    if(CacheID > 1)
537      {
538        warn("CacheOps not implemented for secondary/tertiary caches\n");
539      }
540    else
541      {
542        switch(CacheOP)
543          { // Fill Packet Type
544          case 0: warn("Invalidate Cache Op\n");
545            break;
546          case 1: warn("Index Load Tag Cache Op\n");
547            break;
548          case 2: warn("Index Store Tag Cache Op\n");
549            break;
550          case 4: warn("Hit Invalidate Cache Op\n");
551            break;
552          case 5: warn("Fill/Hit Writeback Invalidate Cache Op\n");
553            break;
554          case 6: warn("Hit Writeback\n");
555            break;
556          case 7: warn("Fetch & Lock Cache Op\n");
557            break;
558          default: warn("Unimplemented Cache Op\n");
559          }
560      }
561    return fault;
562}*/
563