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