base.cc revision 6658:f4de76601762 
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
208Fault
209BaseSimpleCPU::copySrcTranslate(Addr src)
210{
211#if 0
212    static bool no_warn = true;
213    unsigned blk_size =
214        (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
215    // Only support block sizes of 64 atm.
216    assert(blk_size == 64);
217    int offset = src & (blk_size - 1);
218
219    // Make sure block doesn't span page
220    if (no_warn &&
221        (src & PageMask) != ((src + blk_size) & PageMask) &&
222        (src >> 40) != 0xfffffc) {
223        warn("Copied block source spans pages %x.", src);
224        no_warn = false;
225    }
226
227    memReq->reset(src & ~(blk_size - 1), blk_size);
228
229    // translate to physical address
230    Fault fault = thread->translateDataReadReq(req);
231
232    if (fault == NoFault) {
233        thread->copySrcAddr = src;
234        thread->copySrcPhysAddr = memReq->paddr + offset;
235    } else {
236        assert(!fault->isAlignmentFault());
237
238        thread->copySrcAddr = 0;
239        thread->copySrcPhysAddr = 0;
240    }
241    return fault;
242#else
243    return NoFault;
244#endif
245}
246
247Fault
248BaseSimpleCPU::copy(Addr dest)
249{
250#if 0
251    static bool no_warn = true;
252    unsigned blk_size =
253        (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
254    // Only support block sizes of 64 atm.
255    assert(blk_size == 64);
256    uint8_t data[blk_size];
257    //assert(thread->copySrcAddr);
258    int offset = dest & (blk_size - 1);
259
260    // Make sure block doesn't span page
261    if (no_warn &&
262        (dest & PageMask) != ((dest + blk_size) & PageMask) &&
263        (dest >> 40) != 0xfffffc) {
264        no_warn = false;
265        warn("Copied block destination spans pages %x. ", dest);
266    }
267
268    memReq->reset(dest & ~(blk_size -1), blk_size);
269    // translate to physical address
270    Fault fault = thread->translateDataWriteReq(req);
271
272    if (fault == NoFault) {
273        Addr dest_addr = memReq->paddr + offset;
274        // Need to read straight from memory since we have more than 8 bytes.
275        memReq->paddr = thread->copySrcPhysAddr;
276        thread->mem->read(memReq, data);
277        memReq->paddr = dest_addr;
278        thread->mem->write(memReq, data);
279        if (dcacheInterface) {
280            memReq->cmd = Copy;
281            memReq->completionEvent = NULL;
282            memReq->paddr = thread->copySrcPhysAddr;
283            memReq->dest = dest_addr;
284            memReq->size = 64;
285            memReq->time = curTick;
286            dcacheInterface->access(memReq);
287        }
288    }
289    else
290        assert(!fault->isAlignmentFault());
291
292    return fault;
293#else
294    panic("copy not implemented");
295    return NoFault;
296#endif
297}
298
299#if FULL_SYSTEM
300Addr
301BaseSimpleCPU::dbg_vtophys(Addr addr)
302{
303    return vtophys(tc, addr);
304}
305#endif // FULL_SYSTEM
306
307#if FULL_SYSTEM
308void
309BaseSimpleCPU::wakeup()
310{
311    if (thread->status() != ThreadContext::Suspended)
312        return;
313
314    DPRINTF(Quiesce,"Suspended Processor awoke\n");
315    thread->activate();
316}
317#endif // FULL_SYSTEM
318
319void
320BaseSimpleCPU::checkForInterrupts()
321{
322#if FULL_SYSTEM
323    if (checkInterrupts(tc)) {
324        Fault interrupt = interrupts->getInterrupt(tc);
325
326        if (interrupt != NoFault) {
327            predecoder.reset();
328            interrupts->updateIntrInfo(tc);
329            interrupt->invoke(tc);
330        }
331    }
332#endif
333}
334
335
336void
337BaseSimpleCPU::setupFetchRequest(Request *req)
338{
339    Addr threadPC = thread->readPC();
340
341    // set up memory request for instruction fetch
342#if ISA_HAS_DELAY_SLOT
343    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",threadPC,
344            thread->readNextPC(),thread->readNextNPC());
345#else
346    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p\n",threadPC,
347            thread->readNextPC());
348#endif
349
350    Addr fetchPC = (threadPC & PCMask) + fetchOffset;
351    req->setVirt(0, fetchPC, sizeof(MachInst), Request::INST_FETCH, threadPC);
352}
353
354
355void
356BaseSimpleCPU::preExecute()
357{
358    // maintain $r0 semantics
359    thread->setIntReg(ZeroReg, 0);
360#if THE_ISA == ALPHA_ISA
361    thread->setFloatReg(ZeroReg, 0.0);
362#endif // ALPHA_ISA
363
364    // check for instruction-count-based events
365    comInstEventQueue[0]->serviceEvents(numInst);
366
367    // decode the instruction
368    inst = gtoh(inst);
369
370    MicroPC upc = thread->readMicroPC();
371
372    if (isRomMicroPC(upc)) {
373        stayAtPC = false;
374        curStaticInst = microcodeRom.fetchMicroop(upc, curMacroStaticInst);
375    } else if (!curMacroStaticInst) {
376        //We're not in the middle of a macro instruction
377        StaticInstPtr instPtr = NULL;
378
379        //Predecode, ie bundle up an ExtMachInst
380        //This should go away once the constructor can be set up properly
381        predecoder.setTC(thread->getTC());
382        //If more fetch data is needed, pass it in.
383        Addr fetchPC = (thread->readPC() & PCMask) + fetchOffset;
384        //if(predecoder.needMoreBytes())
385            predecoder.moreBytes(thread->readPC(), fetchPC, inst);
386        //else
387        //    predecoder.process();
388
389        //If an instruction is ready, decode it. Otherwise, we'll have to
390        //fetch beyond the MachInst at the current pc.
391        if (predecoder.extMachInstReady()) {
392#if THE_ISA == X86_ISA
393            thread->setNextPC(thread->readPC() + predecoder.getInstSize());
394#endif // X86_ISA
395            stayAtPC = false;
396            instPtr = StaticInst::decode(predecoder.getExtMachInst(),
397                                         thread->readPC());
398        } else {
399            stayAtPC = true;
400            fetchOffset += sizeof(MachInst);
401        }
402
403        //If we decoded an instruction and it's microcoded, start pulling
404        //out micro ops
405        if (instPtr && instPtr->isMacroop()) {
406            curMacroStaticInst = instPtr;
407            curStaticInst = curMacroStaticInst->fetchMicroop(upc);
408        } else {
409            curStaticInst = instPtr;
410        }
411    } else {
412        //Read the next micro op from the macro op
413        curStaticInst = curMacroStaticInst->fetchMicroop(upc);
414    }
415
416    //If we decoded an instruction this "tick", record information about it.
417    if(curStaticInst)
418    {
419#if TRACING_ON
420        traceData = tracer->getInstRecord(curTick, tc,
421                curStaticInst, thread->readPC(),
422                curMacroStaticInst, thread->readMicroPC());
423
424        DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
425                curStaticInst->getName(), curStaticInst->machInst);
426#endif // TRACING_ON
427
428#if FULL_SYSTEM
429        thread->setInst(inst);
430#endif // FULL_SYSTEM
431    }
432}
433
434void
435BaseSimpleCPU::postExecute()
436{
437#if FULL_SYSTEM
438    if (thread->profile && curStaticInst) {
439        bool usermode = TheISA::inUserMode(tc);
440        thread->profilePC = usermode ? 1 : thread->readPC();
441        ProfileNode *node = thread->profile->consume(tc, curStaticInst);
442        if (node)
443            thread->profileNode = node;
444    }
445#endif
446
447    if (curStaticInst->isMemRef()) {
448        numMemRefs++;
449    }
450
451    if (curStaticInst->isLoad()) {
452        ++numLoad;
453        comLoadEventQueue[0]->serviceEvents(numLoad);
454    }
455
456    if (CPA::available()) {
457        CPA::cpa()->swAutoBegin(tc, thread->readNextPC());
458    }
459
460    traceFunctions(thread->readPC());
461
462    if (traceData) {
463        traceData->dump();
464        delete traceData;
465        traceData = NULL;
466    }
467}
468
469
470void
471BaseSimpleCPU::advancePC(Fault fault)
472{
473    //Since we're moving to a new pc, zero out the offset
474    fetchOffset = 0;
475    if (fault != NoFault) {
476        curMacroStaticInst = StaticInst::nullStaticInstPtr;
477        predecoder.reset();
478        fault->invoke(tc);
479    } else {
480        //If we're at the last micro op for this instruction
481        if (curStaticInst && curStaticInst->isLastMicroop()) {
482            //We should be working with a macro op or be in the ROM
483            assert(curMacroStaticInst ||
484                    isRomMicroPC(thread->readMicroPC()));
485            //Close out this macro op, and clean up the
486            //microcode state
487            curMacroStaticInst = StaticInst::nullStaticInstPtr;
488            thread->setMicroPC(normalMicroPC(0));
489            thread->setNextMicroPC(normalMicroPC(1));
490        }
491        //If we're still in a macro op
492        if (curMacroStaticInst || isRomMicroPC(thread->readMicroPC())) {
493            //Advance the micro pc
494            thread->setMicroPC(thread->readNextMicroPC());
495            //Advance the "next" micro pc. Note that there are no delay
496            //slots, and micro ops are "word" addressed.
497            thread->setNextMicroPC(thread->readNextMicroPC() + 1);
498        } else {
499            // go to the next instruction
500            thread->setPC(thread->readNextPC());
501            thread->setNextPC(thread->readNextNPC());
502            thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
503            assert(thread->readNextPC() != thread->readNextNPC());
504        }
505    }
506}
507
508/*Fault
509BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr)
510{
511    // translate to physical address
512    Fault fault = NoFault;
513    int CacheID = Op & 0x3; // Lower 3 bits identify Cache
514    int CacheOP = Op >> 2; // Upper 3 bits identify Cache Operation
515    if(CacheID > 1)
516      {
517        warn("CacheOps not implemented for secondary/tertiary caches\n");
518      }
519    else
520      {
521        switch(CacheOP)
522          { // Fill Packet Type
523          case 0: warn("Invalidate Cache Op\n");
524            break;
525          case 1: warn("Index Load Tag Cache Op\n");
526            break;
527          case 2: warn("Index Store Tag Cache Op\n");
528            break;
529          case 4: warn("Hit Invalidate Cache Op\n");
530            break;
531          case 5: warn("Fill/Hit Writeback Invalidate Cache Op\n");
532            break;
533          case 6: warn("Hit Writeback\n");
534            break;
535          case 7: warn("Fetch & Lock Cache Op\n");
536            break;
537          default: warn("Unimplemented Cache Op\n");
538          }
539      }
540    return fault;
541}*/
542