src/cpu/simple/base.cc

   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/builder.hh"
  51 #include "sim/byteswap.hh"
  52 #include "sim/debug.hh"
  53 #include "sim/host.hh"
  54 #include "sim/sim_events.hh"
  55 #include "sim/sim_object.hh"
  56 #include "sim/stats.hh"
  57 #include "sim/system.hh"
  58
  59 #if FULL_SYSTEM
  60 #include "arch/kernel_stats.hh"
  61 #include "arch/stacktrace.hh"
  62 #include "arch/tlb.hh"
  63 #include "arch/vtophys.hh"
  64 #include "base/remote_gdb.hh"
  65 #else // !FULL_SYSTEM
  66 #include "mem/mem_object.hh"
  67 #endif // FULL_SYSTEM
  68
  69 using namespace std;
  70 using namespace TheISA;
  71
  72 BaseSimpleCPU::BaseSimpleCPU(Params *p)
  73     : BaseCPU(p), thread(NULL)
  74 {
  75 #if FULL_SYSTEM
  76     thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
  77 #else
  78     thread = new SimpleThread(this, /* thread_num */ 0, p->process,
  79             /* asid */ 0);
  80 #endif // !FULL_SYSTEM
  81
  82     thread->setStatus(ThreadContext::Suspended);
  83
  84     tc = thread->getTC();
  85
  86     numInst = 0;
  87     startNumInst = 0;
  88     numLoad = 0;
  89     startNumLoad = 0;
  90     lastIcacheStall = 0;
  91     lastDcacheStall = 0;
  92
  93     threadContexts.push_back(tc);
  94 }
  95
  96 BaseSimpleCPU::~BaseSimpleCPU()
  97 {
  98 }
  99
 100 void
 101 BaseSimpleCPU::deallocateContext(int thread_num)
 102 {
 103     // for now, these are equivalent
 104     suspendContext(thread_num);
 105 }
 106
 107
 108 void
 109 BaseSimpleCPU::haltContext(int thread_num)
 110 {
 111     // for now, these are equivalent
 112     suspendContext(thread_num);
 113 }
 114
 115
 116 void
 117 BaseSimpleCPU::regStats()
 118 {
 119     using namespace Stats;
 120
 121     BaseCPU::regStats();
 122
 123     numInsts
 124         .name(name() + ".num_insts")
 125         .desc("Number of instructions executed")
 126         ;
 127
 128     numMemRefs
 129         .name(name() + ".num_refs")
 130         .desc("Number of memory references")
 131         ;
 132
 133     notIdleFraction
 134         .name(name() + ".not_idle_fraction")
 135         .desc("Percentage of non-idle cycles")
 136         ;
 137
 138     idleFraction
 139         .name(name() + ".idle_fraction")
 140         .desc("Percentage of idle cycles")
 141         ;
 142
 143     icacheStallCycles
 144         .name(name() + ".icache_stall_cycles")
 145         .desc("ICache total stall cycles")
 146         .prereq(icacheStallCycles)
 147         ;
 148
 149     dcacheStallCycles
 150         .name(name() + ".dcache_stall_cycles")
 151         .desc("DCache total stall cycles")
 152         .prereq(dcacheStallCycles)
 153         ;
 154
 155     icacheRetryCycles
 156         .name(name() + ".icache_retry_cycles")
 157         .desc("ICache total retry cycles")
 158         .prereq(icacheRetryCycles)
 159         ;
 160
 161     dcacheRetryCycles
 162         .name(name() + ".dcache_retry_cycles")
 163         .desc("DCache total retry cycles")
 164         .prereq(dcacheRetryCycles)
 165         ;
 166
 167     idleFraction = constant(1.0) - notIdleFraction;
 168 }
 169
 170 void
 171 BaseSimpleCPU::resetStats()
 172 {
 173 //    startNumInst = numInst;
 174     // notIdleFraction = (_status != Idle);
 175 }
 176
 177 void
 178 BaseSimpleCPU::serialize(ostream &os)
 179 {
 180     BaseCPU::serialize(os);
 181 //    SERIALIZE_SCALAR(inst);
 182     nameOut(os, csprintf("%s.xc.0", name()));
 183     thread->serialize(os);
 184 }
 185
 186 void
 187 BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
 188 {
 189     BaseCPU::unserialize(cp, section);
 190 //    UNSERIALIZE_SCALAR(inst);
 191     thread->unserialize(cp, csprintf("%s.xc.0", section));
 192 }
 193
 194 void
 195 change_thread_state(int thread_number, int activate, int priority)
 196 {
 197 }
 198
 199 Fault
 200 BaseSimpleCPU::copySrcTranslate(Addr src)
 201 {
 202 #if 0
 203     static bool no_warn = true;
 204     int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
 205     // Only support block sizes of 64 atm.
 206     assert(blk_size == 64);
 207     int offset = src & (blk_size - 1);
 208
 209     // Make sure block doesn't span page
 210     if (no_warn &&
 211         (src & PageMask) != ((src + blk_size) & PageMask) &&
 212         (src >> 40) != 0xfffffc) {
 213         warn("Copied block source spans pages %x.", src);
 214         no_warn = false;
 215     }
 216
 217     memReq->reset(src & ~(blk_size - 1), blk_size);
 218
 219     // translate to physical address
 220     Fault fault = thread->translateDataReadReq(req);
 221
 222     if (fault == NoFault) {
 223         thread->copySrcAddr = src;
 224         thread->copySrcPhysAddr = memReq->paddr + offset;
 225     } else {
 226         assert(!fault->isAlignmentFault());
 227
 228         thread->copySrcAddr = 0;
 229         thread->copySrcPhysAddr = 0;
 230     }
 231     return fault;
 232 #else
 233     return NoFault;
 234 #endif
 235 }
 236
 237 Fault
 238 BaseSimpleCPU::copy(Addr dest)
 239 {
 240 #if 0
 241     static bool no_warn = true;
 242     int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
 243     // Only support block sizes of 64 atm.
 244     assert(blk_size == 64);
 245     uint8_t data[blk_size];
 246     //assert(thread->copySrcAddr);
 247     int offset = dest & (blk_size - 1);
 248
 249     // Make sure block doesn't span page
 250     if (no_warn &&
 251         (dest & PageMask) != ((dest + blk_size) & PageMask) &&
 252         (dest >> 40) != 0xfffffc) {
 253         no_warn = false;
 254         warn("Copied block destination spans pages %x. ", dest);
 255     }
 256
 257     memReq->reset(dest & ~(blk_size -1), blk_size);
 258     // translate to physical address
 259     Fault fault = thread->translateDataWriteReq(req);
 260
 261     if (fault == NoFault) {
 262         Addr dest_addr = memReq->paddr + offset;
 263         // Need to read straight from memory since we have more than 8 bytes.
 264         memReq->paddr = thread->copySrcPhysAddr;
 265         thread->mem->read(memReq, data);
 266         memReq->paddr = dest_addr;
 267         thread->mem->write(memReq, data);
 268         if (dcacheInterface) {
 269             memReq->cmd = Copy;
 270             memReq->completionEvent = NULL;
 271             memReq->paddr = thread->copySrcPhysAddr;
 272             memReq->dest = dest_addr;
 273             memReq->size = 64;
 274             memReq->time = curTick;
 275             memReq->flags &= ~INST_READ;
 276             dcacheInterface->access(memReq);
 277         }
 278     }
 279     else
 280         assert(!fault->isAlignmentFault());
 281
 282     return fault;
 283 #else
 284     panic("copy not implemented");
 285     return NoFault;
 286 #endif
 287 }
 288
 289 #if FULL_SYSTEM
 290 Addr
 291 BaseSimpleCPU::dbg_vtophys(Addr addr)
 292 {
 293     return vtophys(tc, addr);
 294 }
 295 #endif // FULL_SYSTEM
 296
 297 #if FULL_SYSTEM
 298 void
 299 BaseSimpleCPU::post_interrupt(int int_num, int index)
 300 {
 301     BaseCPU::post_interrupt(int_num, index);
 302
 303     if (thread->status() == ThreadContext::Suspended) {
 304                 DPRINTF(IPI,"Suspended Processor awoke\n");
 305         thread->activate();
 306     }
 307 }
 308 #endif // FULL_SYSTEM
 309
 310 void
 311 BaseSimpleCPU::checkForInterrupts()
 312 {
 313 #if FULL_SYSTEM
 314     if (checkInterrupts && check_interrupts(tc)) {
 315         Fault interrupt = interrupts.getInterrupt(tc);
 316
 317         if (interrupt != NoFault) {
 318             interrupts.updateIntrInfo(tc);
 319             checkInterrupts = false;
 320             interrupt->invoke(tc);
 321         }
 322     }
 323 #endif
 324 }
 325
 326
 327 Fault
 328 BaseSimpleCPU::setupFetchRequest(Request *req)
 329 {
 330     // set up memory request for instruction fetch
 331 #if ISA_HAS_DELAY_SLOT
 332     DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",thread->readPC(),
 333             thread->readNextPC(),thread->readNextNPC());
 334 #else
 335     DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p",thread->readPC(),
 336             thread->readNextPC());
 337 #endif
 338
 339     req->setVirt(0, thread->readPC() & ~3, sizeof(MachInst),
 340                  (FULL_SYSTEM && (thread->readPC() & 1)) ? PHYSICAL : 0,
 341                  thread->readPC());
 342
 343     Fault fault = thread->translateInstReq(req);
 344
 345     return fault;
 346 }
 347
 348
 349 void
 350 BaseSimpleCPU::preExecute()
 351 {
 352     // maintain $r0 semantics
 353     thread->setIntReg(ZeroReg, 0);
 354 #if THE_ISA == ALPHA_ISA
 355     thread->setFloatReg(ZeroReg, 0.0);
 356 #endif // ALPHA_ISA
 357
 358     // keep an instruction count
 359     numInst++;
 360     numInsts++;
 361
 362     thread->funcExeInst++;
 363
 364     // check for instruction-count-based events
 365     comInstEventQueue[0]->serviceEvents(numInst);
 366
 367     // decode the instruction
 368     inst = gtoh(inst);
 369     //If we're not in the middle of a macro instruction
 370     if (!curMacroStaticInst) {
 371 #if THE_ISA == ALPHA_ISA
 372         StaticInstPtr instPtr = StaticInst::decode(makeExtMI(inst, thread->readPC()));
 373 #elif THE_ISA == SPARC_ISA
 374         StaticInstPtr instPtr = StaticInst::decode(makeExtMI(inst, thread->getTC()));
 375 #elif THE_ISA == MIPS_ISA
 376         //Mips doesn't do anything in it's MakeExtMI function right now,
 377         //so it won't be called.
 378         StaticInstPtr instPtr = StaticInst::decode(inst);
 379 #endif
 380         if (instPtr->isMacroOp()) {
 381             curMacroStaticInst = instPtr;
 382             curStaticInst = curMacroStaticInst->
 383                 fetchMicroOp(thread->readMicroPC());
 384         } else {
 385             curStaticInst = instPtr;
 386         }
 387     } else {
 388         //Read the next micro op from the macro op
 389         curStaticInst = curMacroStaticInst->
 390             fetchMicroOp(thread->readMicroPC());
 391     }
 392
 393
 394     traceData = Trace::getInstRecord(curTick, tc, curStaticInst,
 395                                      thread->readPC());
 396
 397     DPRINTF(Decode,"Decode: Decoded %s instruction (opcode: 0x%x): 0x%x\n",
 398             curStaticInst->getName(), curStaticInst->getOpcode(),
 399             curStaticInst->machInst);
 400
 401 #if FULL_SYSTEM
 402     thread->setInst(inst);
 403 #endif // FULL_SYSTEM
 404 }
 405
 406 void
 407 BaseSimpleCPU::postExecute()
 408 {
 409 #if FULL_SYSTEM
 410     if (thread->profile) {
 411         bool usermode = TheISA::inUserMode(tc);
 412         thread->profilePC = usermode ? 1 : thread->readPC();
 413         ProfileNode *node = thread->profile->consume(tc, inst);
 414         if (node)
 415             thread->profileNode = node;
 416     }
 417 #endif
 418
 419     if (curStaticInst->isMemRef()) {
 420         numMemRefs++;
 421     }
 422
 423     if (curStaticInst->isLoad()) {
 424         ++numLoad;
 425         comLoadEventQueue[0]->serviceEvents(numLoad);
 426     }
 427
 428     traceFunctions(thread->readPC());
 429
 430     if (traceData) {
 431         traceData->finalize();
 432     }
 433 }
 434
 435
 436 void
 437 BaseSimpleCPU::advancePC(Fault fault)
 438 {
 439     if (fault != NoFault) {
 440         curMacroStaticInst = StaticInst::nullStaticInstPtr;
 441         fault->invoke(tc);
 442     } else {
 443         //If we're at the last micro op for this instruction
 444         if (curStaticInst->isLastMicroOp()) {
 445             //We should be working with a macro op
 446             assert(curMacroStaticInst);
 447             //Close out this macro op, and clean up the
 448             //microcode state
 449             curMacroStaticInst = StaticInst::nullStaticInstPtr;
 450             thread->setMicroPC(0);
 451             thread->setNextMicroPC(1);
 452         }
 453         //If we're still in a macro op
 454         if (curMacroStaticInst) {
 455             //Advance the micro pc
 456             thread->setMicroPC(thread->readNextMicroPC());
 457             //Advance the "next" micro pc. Note that there are no delay
 458             //slots, and micro ops are "word" addressed.
 459             thread->setNextMicroPC(thread->readNextMicroPC() + 1);
 460         } else {
 461             // go to the next instruction
 462             thread->setPC(thread->readNextPC());
 463 #if ISA_HAS_DELAY_SLOT
 464             thread->setNextPC(thread->readNextNPC());
 465             thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
 466             assert(thread->readNextPC() != thread->readNextNPC());
 467 #else
 468             thread->setNextPC(thread->readNextPC() + sizeof(MachInst));
 469 #endif
 470         }
 471     }
 472
 473 #if FULL_SYSTEM
 474     Addr oldpc;
 475     do {
 476         oldpc = thread->readPC();
 477         system->pcEventQueue.service(tc);
 478     } while (oldpc != thread->readPC());
 479 #endif
 480 }
 481