base.cc revision 6331
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 "cpu/base.hh" 44#include "cpu/exetrace.hh" 45#include "cpu/profile.hh" 46#include "cpu/simple/base.hh" 47#include "cpu/simple_thread.hh" 48#include "cpu/smt.hh" 49#include "cpu/static_inst.hh" 50#include "cpu/thread_context.hh" 51#include "mem/packet.hh" 52#include "mem/request.hh" 53#include "params/BaseSimpleCPU.hh" 54#include "sim/byteswap.hh" 55#include "sim/debug.hh" 56#include "sim/sim_events.hh" 57#include "sim/sim_object.hh" 58#include "sim/stats.hh" 59#include "sim/system.hh" 60 61#if FULL_SYSTEM 62#include "arch/kernel_stats.hh" 63#include "arch/stacktrace.hh" 64#include "arch/tlb.hh" 65#include "arch/vtophys.hh" 66#include "base/remote_gdb.hh" 67#else // !FULL_SYSTEM 68#include "mem/mem_object.hh" 69#endif // FULL_SYSTEM 70 71using namespace std; 72using namespace TheISA; 73 74BaseSimpleCPU::BaseSimpleCPU(BaseSimpleCPUParams *p) 75 : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL) 76{ 77#if FULL_SYSTEM 78 thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb); 79#else 80 thread = new SimpleThread(this, /* thread_num */ 0, p->workload[0], 81 p->itb, p->dtb); 82#endif // !FULL_SYSTEM 83 84 thread->setStatus(ThreadContext::Halted); 85 86 tc = thread->getTC(); 87 88 numInst = 0; 89 startNumInst = 0; 90 numLoad = 0; 91 startNumLoad = 0; 92 lastIcacheStall = 0; 93 lastDcacheStall = 0; 94 95 threadContexts.push_back(tc); 96 97 98 fetchOffset = 0; 99 stayAtPC = false; 100} 101 102BaseSimpleCPU::~BaseSimpleCPU() 103{ 104} 105 106void 107BaseSimpleCPU::deallocateContext(int thread_num) 108{ 109 // for now, these are equivalent 110 suspendContext(thread_num); 111} 112 113 114void 115BaseSimpleCPU::haltContext(int thread_num) 116{ 117 // for now, these are equivalent 118 suspendContext(thread_num); 119} 120 121 122void 123BaseSimpleCPU::regStats() 124{ 125 using namespace Stats; 126 127 BaseCPU::regStats(); 128 129 numInsts 130 .name(name() + ".num_insts") 131 .desc("Number of instructions executed") 132 ; 133 134 numMemRefs 135 .name(name() + ".num_refs") 136 .desc("Number of memory references") 137 ; 138 139 notIdleFraction 140 .name(name() + ".not_idle_fraction") 141 .desc("Percentage of non-idle cycles") 142 ; 143 144 idleFraction 145 .name(name() + ".idle_fraction") 146 .desc("Percentage of idle cycles") 147 ; 148 149 icacheStallCycles 150 .name(name() + ".icache_stall_cycles") 151 .desc("ICache total stall cycles") 152 .prereq(icacheStallCycles) 153 ; 154 155 dcacheStallCycles 156 .name(name() + ".dcache_stall_cycles") 157 .desc("DCache total stall cycles") 158 .prereq(dcacheStallCycles) 159 ; 160 161 icacheRetryCycles 162 .name(name() + ".icache_retry_cycles") 163 .desc("ICache total retry cycles") 164 .prereq(icacheRetryCycles) 165 ; 166 167 dcacheRetryCycles 168 .name(name() + ".dcache_retry_cycles") 169 .desc("DCache total retry cycles") 170 .prereq(dcacheRetryCycles) 171 ; 172 173 idleFraction = constant(1.0) - notIdleFraction; 174} 175 176void 177BaseSimpleCPU::resetStats() 178{ 179// startNumInst = numInst; 180 notIdleFraction = (_status != Idle); 181} 182 183void 184BaseSimpleCPU::serialize(ostream &os) 185{ 186 SERIALIZE_ENUM(_status); 187 BaseCPU::serialize(os); 188// SERIALIZE_SCALAR(inst); 189 nameOut(os, csprintf("%s.xc.0", name())); 190 thread->serialize(os); 191} 192 193void 194BaseSimpleCPU::unserialize(Checkpoint *cp, const string §ion) 195{ 196 UNSERIALIZE_ENUM(_status); 197 BaseCPU::unserialize(cp, section); 198// UNSERIALIZE_SCALAR(inst); 199 thread->unserialize(cp, csprintf("%s.xc.0", section)); 200} 201 202void 203change_thread_state(ThreadID tid, int activate, int priority) 204{ 205} 206 207Fault 208BaseSimpleCPU::copySrcTranslate(Addr src) 209{ 210#if 0 211 static bool no_warn = true; 212 unsigned blk_size = 213 (dcacheInterface) ? dcacheInterface->getBlockSize() : 64; 214 // Only support block sizes of 64 atm. 215 assert(blk_size == 64); 216 int offset = src & (blk_size - 1); 217 218 // Make sure block doesn't span page 219 if (no_warn && 220 (src & PageMask) != ((src + blk_size) & PageMask) && 221 (src >> 40) != 0xfffffc) { 222 warn("Copied block source spans pages %x.", src); 223 no_warn = false; 224 } 225 226 memReq->reset(src & ~(blk_size - 1), blk_size); 227 228 // translate to physical address 229 Fault fault = thread->translateDataReadReq(req); 230 231 if (fault == NoFault) { 232 thread->copySrcAddr = src; 233 thread->copySrcPhysAddr = memReq->paddr + offset; 234 } else { 235 assert(!fault->isAlignmentFault()); 236 237 thread->copySrcAddr = 0; 238 thread->copySrcPhysAddr = 0; 239 } 240 return fault; 241#else 242 return NoFault; 243#endif 244} 245 246Fault 247BaseSimpleCPU::copy(Addr dest) 248{ 249#if 0 250 static bool no_warn = true; 251 unsigned blk_size = 252 (dcacheInterface) ? dcacheInterface->getBlockSize() : 64; 253 // Only support block sizes of 64 atm. 254 assert(blk_size == 64); 255 uint8_t data[blk_size]; 256 //assert(thread->copySrcAddr); 257 int offset = dest & (blk_size - 1); 258 259 // Make sure block doesn't span page 260 if (no_warn && 261 (dest & PageMask) != ((dest + blk_size) & PageMask) && 262 (dest >> 40) != 0xfffffc) { 263 no_warn = false; 264 warn("Copied block destination spans pages %x. ", dest); 265 } 266 267 memReq->reset(dest & ~(blk_size -1), blk_size); 268 // translate to physical address 269 Fault fault = thread->translateDataWriteReq(req); 270 271 if (fault == NoFault) { 272 Addr dest_addr = memReq->paddr + offset; 273 // Need to read straight from memory since we have more than 8 bytes. 274 memReq->paddr = thread->copySrcPhysAddr; 275 thread->mem->read(memReq, data); 276 memReq->paddr = dest_addr; 277 thread->mem->write(memReq, data); 278 if (dcacheInterface) { 279 memReq->cmd = Copy; 280 memReq->completionEvent = NULL; 281 memReq->paddr = thread->copySrcPhysAddr; 282 memReq->dest = dest_addr; 283 memReq->size = 64; 284 memReq->time = curTick; 285 memReq->flags &= ~INST_FETCH; 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