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::ITB *_itb, TheISA::DTB *_dtb,
  65                            bool use_kernel_stats)
  66     : ThreadState(_cpu, _thread_num), cpu(_cpu), system(_sys), itb(_itb),
  67       dtb(_dtb)
  68
  69 {
  70     tc = new ProxyThreadContext<SimpleThread>(this);
  71
  72     quiesceEvent = new EndQuiesceEvent(tc);
  73
  74     regs.clear();
  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::ITB *_itb, TheISA::DTB *_dtb, int _asid)
  96     : ThreadState(_cpu, _thread_num, _process, _asid),
  97       cpu(_cpu), itb(_itb), dtb(_dtb)
  98 {
  99     regs.clear();
 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, -1)
 110 #endif
 111 {
 112     tc = new ProxyThreadContext<SimpleThread>(this);
 113     regs.clear();
 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::Unallocated);
 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     regs.serialize(cpu, os);
 195     // thread_num and cpu_id are deterministic from the config
 196 }
 197
 198
 199 void
 200 SimpleThread::unserialize(Checkpoint *cp, const std::string &section)
 201 {
 202     ThreadState::unserialize(cp, section);
 203     regs.unserialize(cpu, cp, section);
 204     // thread_num and cpu_id are deterministic from the config
 205 }
 206
 207 #if FULL_SYSTEM
 208 void
 209 SimpleThread::dumpFuncProfile()
 210 {
 211     std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
 212     profile->dump(tc, *os);
 213 }
 214 #endif
 215
 216 void
 217 SimpleThread::activate(int delay)
 218 {
 219     if (status() == ThreadContext::Active)
 220         return;
 221
 222     lastActivate = curTick;
 223
 224 //    if (status() == ThreadContext::Unallocated) {
 225 //      cpu->activateWhenReady(_threadId);
 226 //      return;
 227 //   }
 228
 229     _status = ThreadContext::Active;
 230
 231     // status() == Suspended
 232     cpu->activateContext(_threadId, delay);
 233 }
 234
 235 void
 236 SimpleThread::suspend()
 237 {
 238     if (status() == ThreadContext::Suspended)
 239         return;
 240
 241     lastActivate = curTick;
 242     lastSuspend = curTick;
 243 /*
 244 #if FULL_SYSTEM
 245     // Don't change the status from active if there are pending interrupts
 246     if (cpu->checkInterrupts()) {
 247         assert(status() == ThreadContext::Active);
 248         return;
 249     }
 250 #endif
 251 */
 252     _status = ThreadContext::Suspended;
 253     cpu->suspendContext(_threadId);
 254 }
 255
 256 void
 257 SimpleThread::deallocate()
 258 {
 259     if (status() == ThreadContext::Unallocated)
 260         return;
 261
 262     _status = ThreadContext::Unallocated;
 263     cpu->deallocateContext(_threadId);
 264 }
 265
 266 void
 267 SimpleThread::halt()
 268 {
 269     if (status() == ThreadContext::Halted)
 270         return;
 271
 272     _status = ThreadContext::Halted;
 273     cpu->haltContext(_threadId);
 274 }
 275
 276
 277 void
 278 SimpleThread::regStats(const string &name)
 279 {
 280 #if FULL_SYSTEM
 281     if (kernelStats)
 282         kernelStats->regStats(name + ".kern");
 283 #endif
 284 }
 285
 286 void
 287 SimpleThread::copyArchRegs(ThreadContext *src_tc)
 288 {
 289     TheISA::copyRegs(src_tc, tc);
 290 }
 291