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