src/cpu/simple_thread.cc

   1 /*
   2  * Copyright (c) 2001-2006 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  *          Nathan Binkert
  30  *          Lisa Hsu
  31  *          Kevin Lim
  32  */
  33
  34 #include <string>
  35
  36 #include "arch/isa_traits.hh"
  37 #include "arch/utility.hh"
  38 #include "config/the_isa.hh"
  39 #include "cpu/base.hh"
  40 #include "cpu/simple_thread.hh"
  41 #include "cpu/thread_context.hh"
  42 #include "params/BaseCPU.hh"
  43
  44 #if FULL_SYSTEM
  45 #include "arch/kernel_stats.hh"
  46 #include "arch/stacktrace.hh"
  47 #include "base/callback.hh"
  48 #include "base/cprintf.hh"
  49 #include "base/output.hh"
  50 #include "base/trace.hh"
  51 #include "cpu/profile.hh"
  52 #include "cpu/quiesce_event.hh"
  53 #include "mem/vport.hh"
  54 #include "sim/serialize.hh"
  55 #include "sim/sim_exit.hh"
  56 #else
  57 #include "mem/translating_port.hh"
  58 #include "sim/process.hh"
  59 #include "sim/system.hh"
  60 #endif
  61
  62 using namespace std;
  63
  64 // constructor
  65 #if FULL_SYSTEM
  66 SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
  67                            TheISA::TLB *_itb, TheISA::TLB *_dtb,
  68                            bool use_kernel_stats)
  69     : ThreadState(_cpu, _thread_num),
  70       cpu(_cpu), system(_sys), itb(_itb), dtb(_dtb)
  71
  72 {
  73     tc = new ProxyThreadContext<SimpleThread>(this);
  74
  75     quiesceEvent = new EndQuiesceEvent(tc);
  76
  77     clearArchRegs();
  78
  79     if (cpu->params()->profile) {
  80         profile = new FunctionProfile(system->kernelSymtab);
  81         Callback *cb =
  82             new MakeCallback<SimpleThread,
  83             &SimpleThread::dumpFuncProfile>(this);
  84         registerExitCallback(cb);
  85     }
  86
  87     // let's fill with a dummy node for now so we don't get a segfault
  88     // on the first cycle when there's no node available.
  89     static ProfileNode dummyNode;
  90     profileNode = &dummyNode;
  91     profilePC = 3;
  92
  93     if (use_kernel_stats)
  94         kernelStats = new TheISA::Kernel::Statistics(system);
  95 }
  96 #else
  97 SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, Process *_process,
  98                            TheISA::TLB *_itb, TheISA::TLB *_dtb)
  99     : ThreadState(_cpu, _thread_num, _process),
 100       cpu(_cpu), itb(_itb), dtb(_dtb)
 101 {
 102     clearArchRegs();
 103     tc = new ProxyThreadContext<SimpleThread>(this);
 104 }
 105
 106 #endif
 107
 108 SimpleThread::SimpleThread()
 109 #if FULL_SYSTEM
 110     : ThreadState(NULL, -1)
 111 #else
 112     : ThreadState(NULL, -1, NULL)
 113 #endif
 114 {
 115     tc = new ProxyThreadContext<SimpleThread>(this);
 116 }
 117
 118 SimpleThread::~SimpleThread()
 119 {
 120 #if FULL_SYSTEM
 121     delete physPort;
 122     delete virtPort;
 123 #endif
 124     delete tc;
 125 }
 126
 127 void
 128 SimpleThread::takeOverFrom(ThreadContext *oldContext)
 129 {
 130     // some things should already be set up
 131 #if FULL_SYSTEM
 132     assert(system == oldContext->getSystemPtr());
 133 #else
 134     assert(process == oldContext->getProcessPtr());
 135 #endif
 136
 137     copyState(oldContext);
 138 #if FULL_SYSTEM
 139     EndQuiesceEvent *quiesce = oldContext->getQuiesceEvent();
 140     if (quiesce) {
 141         // Point the quiesce event's TC at this TC so that it wakes up
 142         // the proper CPU.
 143         quiesce->tc = tc;
 144     }
 145     if (quiesceEvent) {
 146         quiesceEvent->tc = tc;
 147     }
 148
 149     TheISA::Kernel::Statistics *stats = oldContext->getKernelStats();
 150     if (stats) {
 151         kernelStats = stats;
 152     }
 153 #endif
 154
 155     storeCondFailures = 0;
 156
 157     oldContext->setStatus(ThreadContext::Halted);
 158 }
 159
 160 void
 161 SimpleThread::copyTC(ThreadContext *context)
 162 {
 163     copyState(context);
 164
 165 #if FULL_SYSTEM
 166     EndQuiesceEvent *quiesce = context->getQuiesceEvent();
 167     if (quiesce) {
 168         quiesceEvent = quiesce;
 169     }
 170     TheISA::Kernel::Statistics *stats = context->getKernelStats();
 171     if (stats) {
 172         kernelStats = stats;
 173     }
 174 #endif
 175 }
 176
 177 void
 178 SimpleThread::copyState(ThreadContext *oldContext)
 179 {
 180     // copy over functional state
 181     _status = oldContext->status();
 182     copyArchRegs(oldContext);
 183 #if !FULL_SYSTEM
 184     funcExeInst = oldContext->readFuncExeInst();
 185 #endif
 186
 187     _threadId = oldContext->threadId();
 188     _contextId = oldContext->contextId();
 189 }
 190
 191 void
 192 SimpleThread::serialize(ostream &os)
 193 {
 194     ThreadState::serialize(os);
 195     SERIALIZE_ARRAY(floatRegs.i, TheISA::NumFloatRegs);
 196     SERIALIZE_ARRAY(intRegs, TheISA::NumIntRegs);
 197     _pcState.serialize(os);
 198     // thread_num and cpu_id are deterministic from the config
 199
 200     //
 201     // Now must serialize all the ISA dependent state
 202     //
 203     isa.serialize(cpu, os);
 204 }
 205
 206
 207 void
 208 SimpleThread::unserialize(Checkpoint *cp, const std::string &section)
 209 {
 210     ThreadState::unserialize(cp, section);
 211     UNSERIALIZE_ARRAY(floatRegs.i, TheISA::NumFloatRegs);
 212     UNSERIALIZE_ARRAY(intRegs, TheISA::NumIntRegs);
 213     _pcState.unserialize(cp, section);
 214     // thread_num and cpu_id are deterministic from the config
 215
 216     //
 217     // Now must unserialize all the ISA dependent state
 218     //
 219     isa.unserialize(cpu, cp, section);
 220 }
 221
 222 #if FULL_SYSTEM
 223 void
 224 SimpleThread::dumpFuncProfile()
 225 {
 226     std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
 227     profile->dump(tc, *os);
 228 }
 229 #endif
 230
 231 void
 232 SimpleThread::activate(int delay)
 233 {
 234     if (status() == ThreadContext::Active)
 235         return;
 236
 237     lastActivate = curTick();
 238
 239 //    if (status() == ThreadContext::Unallocated) {
 240 //      cpu->activateWhenReady(_threadId);
 241 //      return;
 242 //   }
 243
 244     _status = ThreadContext::Active;
 245
 246     // status() == Suspended
 247     cpu->activateContext(_threadId, delay);
 248 }
 249
 250 void
 251 SimpleThread::suspend()
 252 {
 253     if (status() == ThreadContext::Suspended)
 254         return;
 255
 256     lastActivate = curTick();
 257     lastSuspend = curTick();
 258 /*
 259 #if FULL_SYSTEM
 260     // Don't change the status from active if there are pending interrupts
 261     if (cpu->checkInterrupts()) {
 262         assert(status() == ThreadContext::Active);
 263         return;
 264     }
 265 #endif
 266 */
 267     _status = ThreadContext::Suspended;
 268     cpu->suspendContext(_threadId);
 269 }
 270
 271
 272 void
 273 SimpleThread::halt()
 274 {
 275     if (status() == ThreadContext::Halted)
 276         return;
 277
 278     _status = ThreadContext::Halted;
 279     cpu->haltContext(_threadId);
 280 }
 281
 282
 283 void
 284 SimpleThread::regStats(const string &name)
 285 {
 286 #if FULL_SYSTEM
 287     if (kernelStats)
 288         kernelStats->regStats(name + ".kern");
 289 #endif
 290 }
 291
 292 void
 293 SimpleThread::copyArchRegs(ThreadContext *src_tc)
 294 {
 295     TheISA::copyRegs(src_tc, tc);
 296 }
 297