base.cc revision 5784 
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/utility.hh"
32#include "arch/faults.hh"
33#include "base/cprintf.hh"
34#include "base/inifile.hh"
35#include "base/loader/symtab.hh"
36#include "base/misc.hh"
37#include "base/pollevent.hh"
38#include "base/range.hh"
39#include "base/stats/events.hh"
40#include "base/trace.hh"
41#include "cpu/base.hh"
42#include "cpu/exetrace.hh"
43#include "cpu/profile.hh"
44#include "cpu/simple/base.hh"
45#include "cpu/simple_thread.hh"
46#include "cpu/smt.hh"
47#include "cpu/static_inst.hh"
48#include "cpu/thread_context.hh"
49#include "mem/packet.hh"
50#include "sim/byteswap.hh"
51#include "sim/debug.hh"
52#include "sim/host.hh"
53#include "sim/sim_events.hh"
54#include "sim/sim_object.hh"
55#include "sim/stats.hh"
56#include "sim/system.hh"
57
58#if FULL_SYSTEM
59#include "arch/kernel_stats.hh"
60#include "arch/stacktrace.hh"
61#include "arch/tlb.hh"
62#include "arch/vtophys.hh"
63#include "base/remote_gdb.hh"
64#else // !FULL_SYSTEM
65#include "mem/mem_object.hh"
66#endif // FULL_SYSTEM
67
68#include "params/BaseSimpleCPU.hh"
69
70using namespace std;
71using namespace TheISA;
72
73BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p)
74    : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL)
75{
76#if FULL_SYSTEM
77    thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
78#else
79    thread = new SimpleThread(this, /* thread_num */ 0, p->workload[0],
80            p->itb, p->dtb, /* asid */ 0);
81#endif // !FULL_SYSTEM
82
83    thread->setStatus(ThreadContext::Unallocated);
84
85    tc = thread->getTC();
86
87    numInst = 0;
88    startNumInst = 0;
89    numLoad = 0;
90    startNumLoad = 0;
91    lastIcacheStall = 0;
92    lastDcacheStall = 0;
93
94    threadContexts.push_back(tc);
95
96
97    fetchOffset = 0;
98    stayAtPC = false;
99}
100
101BaseSimpleCPU::~BaseSimpleCPU()
102{
103}
104
105void
106BaseSimpleCPU::deallocateContext(int thread_num)
107{
108    // for now, these are equivalent
109    suspendContext(thread_num);
110}
111
112
113void
114BaseSimpleCPU::haltContext(int thread_num)
115{
116    // for now, these are equivalent
117    suspendContext(thread_num);
118}
119
120
121void
122BaseSimpleCPU::regStats()
123{
124    using namespace Stats;
125
126    BaseCPU::regStats();
127
128    numInsts
129        .name(name() + ".num_insts")
130        .desc("Number of instructions executed")
131        ;
132
133    numMemRefs
134        .name(name() + ".num_refs")
135        .desc("Number of memory references")
136        ;
137
138    notIdleFraction
139        .name(name() + ".not_idle_fraction")
140        .desc("Percentage of non-idle cycles")
141        ;
142
143    idleFraction
144        .name(name() + ".idle_fraction")
145        .desc("Percentage of idle cycles")
146        ;
147
148    icacheStallCycles
149        .name(name() + ".icache_stall_cycles")
150        .desc("ICache total stall cycles")
151        .prereq(icacheStallCycles)
152        ;
153
154    dcacheStallCycles
155        .name(name() + ".dcache_stall_cycles")
156        .desc("DCache total stall cycles")
157        .prereq(dcacheStallCycles)
158        ;
159
160    icacheRetryCycles
161        .name(name() + ".icache_retry_cycles")
162        .desc("ICache total retry cycles")
163        .prereq(icacheRetryCycles)
164        ;
165
166    dcacheRetryCycles
167        .name(name() + ".dcache_retry_cycles")
168        .desc("DCache total retry cycles")
169        .prereq(dcacheRetryCycles)
170        ;
171
172    idleFraction = constant(1.0) - notIdleFraction;
173}
174
175void
176BaseSimpleCPU::resetStats()
177{
178//    startNumInst = numInst;
179     notIdleFraction = (_status != Idle);
180}
181
182void
183BaseSimpleCPU::serialize(ostream &os)
184{
185    SERIALIZE_ENUM(_status);
186    BaseCPU::serialize(os);
187//    SERIALIZE_SCALAR(inst);
188    nameOut(os, csprintf("%s.xc.0", name()));
189    thread->serialize(os);
190}
191
192void
193BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
194{
195    UNSERIALIZE_ENUM(_status);
196    BaseCPU::unserialize(cp, section);
197//    UNSERIALIZE_SCALAR(inst);
198    thread->unserialize(cp, csprintf("%s.xc.0", section));
199}
200
201void
202change_thread_state(int thread_number, int activate, int priority)
203{
204}
205
206Fault
207BaseSimpleCPU::copySrcTranslate(Addr src)
208{
209#if 0
210    static bool no_warn = true;
211    int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
212    // Only support block sizes of 64 atm.
213    assert(blk_size == 64);
214    int offset = src & (blk_size - 1);
215
216    // Make sure block doesn't span page
217    if (no_warn &&
218        (src & PageMask) != ((src + blk_size) & PageMask) &&
219        (src >> 40) != 0xfffffc) {
220        warn("Copied block source spans pages %x.", src);
221        no_warn = false;
222    }
223
224    memReq->reset(src & ~(blk_size - 1), blk_size);
225
226    // translate to physical address
227    Fault fault = thread->translateDataReadReq(req);
228
229    if (fault == NoFault) {
230        thread->copySrcAddr = src;
231        thread->copySrcPhysAddr = memReq->paddr + offset;
232    } else {
233        assert(!fault->isAlignmentFault());
234
235        thread->copySrcAddr = 0;
236        thread->copySrcPhysAddr = 0;
237    }
238    return fault;
239#else
240    return NoFault;
241#endif
242}
243
244Fault
245BaseSimpleCPU::copy(Addr dest)
246{
247#if 0
248    static bool no_warn = true;
249    int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
250    // Only support block sizes of 64 atm.
251    assert(blk_size == 64);
252    uint8_t data[blk_size];
253    //assert(thread->copySrcAddr);
254    int offset = dest & (blk_size - 1);
255
256    // Make sure block doesn't span page
257    if (no_warn &&
258        (dest & PageMask) != ((dest + blk_size) & PageMask) &&
259        (dest >> 40) != 0xfffffc) {
260        no_warn = false;
261        warn("Copied block destination spans pages %x. ", dest);
262    }
263
264    memReq->reset(dest & ~(blk_size -1), blk_size);
265    // translate to physical address
266    Fault fault = thread->translateDataWriteReq(req);
267
268    if (fault == NoFault) {
269        Addr dest_addr = memReq->paddr + offset;
270        // Need to read straight from memory since we have more than 8 bytes.
271        memReq->paddr = thread->copySrcPhysAddr;
272        thread->mem->read(memReq, data);
273        memReq->paddr = dest_addr;
274        thread->mem->write(memReq, data);
275        if (dcacheInterface) {
276            memReq->cmd = Copy;
277            memReq->completionEvent = NULL;
278            memReq->paddr = thread->copySrcPhysAddr;
279            memReq->dest = dest_addr;
280            memReq->size = 64;
281            memReq->time = curTick;
282            memReq->flags &= ~INST_READ;
283            dcacheInterface->access(memReq);
284        }
285    }
286    else
287        assert(!fault->isAlignmentFault());
288
289    return fault;
290#else
291    panic("copy not implemented");
292    return NoFault;
293#endif
294}
295
296#if FULL_SYSTEM
297Addr
298BaseSimpleCPU::dbg_vtophys(Addr addr)
299{
300    return vtophys(tc, addr);
301}
302#endif // FULL_SYSTEM
303
304#if FULL_SYSTEM
305void
306BaseSimpleCPU::postInterrupt(int int_num, int index)
307{
308    BaseCPU::postInterrupt(int_num, index);
309
310    if (thread->status() == ThreadContext::Suspended) {
311                DPRINTF(Quiesce,"Suspended Processor awoke\n");
312        thread->activate();
313    }
314}
315#endif // FULL_SYSTEM
316
317void
318BaseSimpleCPU::checkForInterrupts()
319{
320#if FULL_SYSTEM
321    if (checkInterrupts(tc)) {
322        Fault interrupt = interrupts->getInterrupt(tc);
323
324        if (interrupt != NoFault) {
325            interrupts->updateIntrInfo(tc);
326            interrupt->invoke(tc);
327        }
328    }
329#endif
330}
331
332
333Fault
334BaseSimpleCPU::setupFetchRequest(Request *req)
335{
336    Addr threadPC = thread->readPC();
337
338    // set up memory request for instruction fetch
339#if ISA_HAS_DELAY_SLOT
340    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",threadPC,
341            thread->readNextPC(),thread->readNextNPC());
342#else
343    DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p\n",threadPC,
344            thread->readNextPC());
345#endif
346
347    Addr fetchPC = (threadPC & PCMask) + fetchOffset;
348    req->setVirt(0, fetchPC, sizeof(MachInst), 0, threadPC);
349
350    Fault fault = thread->translateInstReq(req);
351
352    return fault;
353}
354
355
356void
357BaseSimpleCPU::preExecute()
358{
359    // maintain $r0 semantics
360    thread->setIntReg(ZeroReg, 0);
361#if THE_ISA == ALPHA_ISA
362    thread->setFloatReg(ZeroReg, 0.0);
363#endif // ALPHA_ISA
364
365    // check for instruction-count-based events
366    comInstEventQueue[0]->serviceEvents(numInst);
367
368    // decode the instruction
369    inst = gtoh(inst);
370
371    MicroPC upc = thread->readMicroPC();
372
373    if (isRomMicroPC(upc)) {
374        stayAtPC = false;
375        curStaticInst = microcodeRom.fetchMicroop(upc, curMacroStaticInst);
376    } else if (!curMacroStaticInst) {
377        //We're not in the middle of a macro instruction
378        StaticInstPtr instPtr = NULL;
379
380        //Predecode, ie bundle up an ExtMachInst
381        //This should go away once the constructor can be set up properly
382        predecoder.setTC(thread->getTC());
383        //If more fetch data is needed, pass it in.
384        Addr fetchPC = (thread->readPC() & PCMask) + fetchOffset;
385        //if(predecoder.needMoreBytes())
386            predecoder.moreBytes(thread->readPC(), fetchPC, inst);
387        //else
388        //    predecoder.process();
389
390        //If an instruction is ready, decode it. Otherwise, we'll have to
391        //fetch beyond the MachInst at the current pc.
392        if (predecoder.extMachInstReady()) {
393#if THE_ISA == X86_ISA
394            thread->setNextPC(thread->readPC() + predecoder.getInstSize());
395#endif // X86_ISA
396            stayAtPC = false;
397            instPtr = StaticInst::decode(predecoder.getExtMachInst(),
398                                         thread->readPC());
399        } else {
400            stayAtPC = true;
401            fetchOffset += sizeof(MachInst);
402        }
403
404        //If we decoded an instruction and it's microcoded, start pulling
405        //out micro ops
406        if (instPtr && instPtr->isMacroop()) {
407            curMacroStaticInst = instPtr;
408            curStaticInst = curMacroStaticInst->fetchMicroop(upc);
409        } else {
410            curStaticInst = instPtr;
411        }
412    } else {
413        //Read the next micro op from the macro op
414        curStaticInst = curMacroStaticInst->fetchMicroop(upc);
415    }
416
417    //If we decoded an instruction this "tick", record information about it.
418    if(curStaticInst)
419    {
420#if TRACING_ON
421        traceData = tracer->getInstRecord(curTick, tc,
422                curStaticInst, thread->readPC(),
423                curMacroStaticInst, thread->readMicroPC());
424
425        DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
426                curStaticInst->getName(), curStaticInst->machInst);
427#endif // TRACING_ON
428
429#if FULL_SYSTEM
430        thread->setInst(inst);
431#endif // FULL_SYSTEM
432    }
433}
434
435void
436BaseSimpleCPU::postExecute()
437{
438#if FULL_SYSTEM
439    if (thread->profile && curStaticInst) {
440        bool usermode = TheISA::inUserMode(tc);
441        thread->profilePC = usermode ? 1 : thread->readPC();
442        ProfileNode *node = thread->profile->consume(tc, curStaticInst);
443        if (node)
444            thread->profileNode = node;
445    }
446#endif
447
448    if (curStaticInst->isMemRef()) {
449        numMemRefs++;
450    }
451
452    if (curStaticInst->isLoad()) {
453        ++numLoad;
454        comLoadEventQueue[0]->serviceEvents(numLoad);
455    }
456
457    traceFunctions(thread->readPC());
458
459    if (traceData) {
460        traceData->dump();
461        delete traceData;
462        traceData = NULL;
463    }
464}
465
466
467void
468BaseSimpleCPU::advancePC(Fault fault)
469{
470    //Since we're moving to a new pc, zero out the offset
471    fetchOffset = 0;
472    if (fault != NoFault) {
473        curMacroStaticInst = StaticInst::nullStaticInstPtr;
474        predecoder.reset();
475        thread->setMicroPC(normalMicroPC(0));
476        thread->setNextMicroPC(normalMicroPC(1));
477        fault->invoke(tc);
478    } else {
479        //If we're at the last micro op for this instruction
480        if (curStaticInst && curStaticInst->isLastMicroop()) {
481            //We should be working with a macro op or be in the ROM
482            assert(curMacroStaticInst ||
483                    isRomMicroPC(thread->readMicroPC()));
484            //Close out this macro op, and clean up the
485            //microcode state
486            curMacroStaticInst = StaticInst::nullStaticInstPtr;
487            thread->setMicroPC(normalMicroPC(0));
488            thread->setNextMicroPC(normalMicroPC(1));
489        }
490        //If we're still in a macro op
491        if (curMacroStaticInst || isRomMicroPC(thread->readMicroPC())) {
492            //Advance the micro pc
493            thread->setMicroPC(thread->readNextMicroPC());
494            //Advance the "next" micro pc. Note that there are no delay
495            //slots, and micro ops are "word" addressed.
496            thread->setNextMicroPC(thread->readNextMicroPC() + 1);
497        } else {
498            // go to the next instruction
499            thread->setPC(thread->readNextPC());
500            thread->setNextPC(thread->readNextNPC());
501            thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
502            assert(thread->readNextPC() != thread->readNextNPC());
503        }
504    }
505}
506
507/*Fault
508BaseSimpleCPU::CacheOp(uint8_t Op, Addr EffAddr)
509{
510    // translate to physical address
511    Fault fault = NoFault;
512    int CacheID = Op & 0x3; // Lower 3 bits identify Cache
513    int CacheOP = Op >> 2; // Upper 3 bits identify Cache Operation
514    if(CacheID > 1)
515      {
516        warn("CacheOps not implemented for secondary/tertiary caches\n");
517      }
518    else
519      {
520        switch(CacheOP)
521          { // Fill Packet Type
522          case 0: warn("Invalidate Cache Op\n");
523            break;
524          case 1: warn("Index Load Tag Cache Op\n");
525            break;
526          case 2: warn("Index Store Tag Cache Op\n");
527            break;
528          case 4: warn("Hit Invalidate Cache Op\n");
529            break;
530          case 5: warn("Fill/Hit Writeback Invalidate Cache Op\n");
531            break;
532          case 6: warn("Hit Writeback\n");
533            break;
534          case 7: warn("Fetch & Lock Cache Op\n");
535            break;
536          default: warn("Unimplemented Cache Op\n");
537          }
538      }
539    return fault;
540}*/
541