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/fs_translating_port_proxy.hh"
  54 #include "sim/serialize.hh"
  55 #include "sim/sim_exit.hh"
  56 #else
  57 #include "mem/se_translating_port_proxy.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       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 (baseCpu->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       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     delete tc;
 121 }
 122
 123 void
 124 SimpleThread::takeOverFrom(ThreadContext *oldContext)
 125 {
 126     // some things should already be set up
 127 #if FULL_SYSTEM
 128     assert(system == oldContext->getSystemPtr());
 129 #else
 130     assert(process == oldContext->getProcessPtr());
 131 #endif
 132
 133     copyState(oldContext);
 134 #if FULL_SYSTEM
 135     EndQuiesceEvent *quiesce = oldContext->getQuiesceEvent();
 136     if (quiesce) {
 137         // Point the quiesce event's TC at this TC so that it wakes up
 138         // the proper CPU.
 139         quiesce->tc = tc;
 140     }
 141     if (quiesceEvent) {
 142         quiesceEvent->tc = tc;
 143     }
 144
 145     TheISA::Kernel::Statistics *stats = oldContext->getKernelStats();
 146     if (stats) {
 147         kernelStats = stats;
 148     }
 149 #endif
 150
 151     storeCondFailures = 0;
 152
 153     oldContext->setStatus(ThreadContext::Halted);
 154 }
 155
 156 void
 157 SimpleThread::copyTC(ThreadContext *context)
 158 {
 159     copyState(context);
 160
 161 #if FULL_SYSTEM
 162     EndQuiesceEvent *quiesce = context->getQuiesceEvent();
 163     if (quiesce) {
 164         quiesceEvent = quiesce;
 165     }
 166     TheISA::Kernel::Statistics *stats = context->getKernelStats();
 167     if (stats) {
 168         kernelStats = stats;
 169     }
 170 #endif
 171 }
 172
 173 void
 174 SimpleThread::copyState(ThreadContext *oldContext)
 175 {
 176     // copy over functional state
 177     _status = oldContext->status();
 178     copyArchRegs(oldContext);
 179 #if !FULL_SYSTEM
 180     funcExeInst = oldContext->readFuncExeInst();
 181 #endif
 182
 183     _threadId = oldContext->threadId();
 184     _contextId = oldContext->contextId();
 185 }
 186
 187 void
 188 SimpleThread::serialize(ostream &os)
 189 {
 190     ThreadState::serialize(os);
 191     SERIALIZE_ARRAY(floatRegs.i, TheISA::NumFloatRegs);
 192     SERIALIZE_ARRAY(intRegs, TheISA::NumIntRegs);
 193     _pcState.serialize(os);
 194     // thread_num and cpu_id are deterministic from the config
 195
 196     //
 197     // Now must serialize all the ISA dependent state
 198     //
 199     isa.serialize(baseCpu, os);
 200 }
 201
 202
 203 void
 204 SimpleThread::unserialize(Checkpoint *cp, const std::string &section)
 205 {
 206     ThreadState::unserialize(cp, section);
 207     UNSERIALIZE_ARRAY(floatRegs.i, TheISA::NumFloatRegs);
 208     UNSERIALIZE_ARRAY(intRegs, TheISA::NumIntRegs);
 209     _pcState.unserialize(cp, section);
 210     // thread_num and cpu_id are deterministic from the config
 211
 212     //
 213     // Now must unserialize all the ISA dependent state
 214     //
 215     isa.unserialize(baseCpu, cp, section);
 216 }
 217
 218 #if FULL_SYSTEM
 219 void
 220 SimpleThread::dumpFuncProfile()
 221 {
 222     std::ostream *os = simout.create(csprintf("profile.%s.dat",
 223                                               baseCpu->name()));
 224     profile->dump(tc, *os);
 225 }
 226 #endif
 227
 228 void
 229 SimpleThread::activate(int delay)
 230 {
 231     if (status() == ThreadContext::Active)
 232         return;
 233
 234     lastActivate = curTick();
 235
 236 //    if (status() == ThreadContext::Unallocated) {
 237 //      cpu->activateWhenReady(_threadId);
 238 //      return;
 239 //   }
 240
 241     _status = ThreadContext::Active;
 242
 243     // status() == Suspended
 244     baseCpu->activateContext(_threadId, delay);
 245 }
 246
 247 void
 248 SimpleThread::suspend()
 249 {
 250     if (status() == ThreadContext::Suspended)
 251         return;
 252
 253     lastActivate = curTick();
 254     lastSuspend = curTick();
 255 /*
 256 #if FULL_SYSTEM
 257     // Don't change the status from active if there are pending interrupts
 258     if (cpu->checkInterrupts()) {
 259         assert(status() == ThreadContext::Active);
 260         return;
 261     }
 262 #endif
 263 */
 264     _status = ThreadContext::Suspended;
 265     baseCpu->suspendContext(_threadId);
 266 }
 267
 268
 269 void
 270 SimpleThread::halt()
 271 {
 272     if (status() == ThreadContext::Halted)
 273         return;
 274
 275     _status = ThreadContext::Halted;
 276     baseCpu->haltContext(_threadId);
 277 }
 278
 279
 280 void
 281 SimpleThread::regStats(const string &name)
 282 {
 283 #if FULL_SYSTEM
 284     if (kernelStats)
 285         kernelStats->regStats(name + ".kern");
 286 #endif
 287 }
 288
 289 void
 290 SimpleThread::copyArchRegs(ThreadContext *src_tc)
 291 {
 292     TheISA::copyRegs(src_tc, tc);
 293 }
 294