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
  41 #if FULL_SYSTEM
  42 #include "arch/kernel_stats.hh"
  43 #include "base/callback.hh"
  44 #include "base/cprintf.hh"
  45 #include "base/output.hh"
  46 #include "base/trace.hh"
  47 #include "cpu/profile.hh"
  48 #include "cpu/quiesce_event.hh"
  49 #include "sim/serialize.hh"
  50 #include "sim/sim_exit.hh"
  51 #include "arch/stacktrace.hh"
  52 #else
  53 #include "sim/process.hh"
  54 #include "sim/system.hh"
  55 #include "mem/translating_port.hh"
  56 #endif
  57
  58 using namespace std;
  59
  60 // constructor
  61 #if FULL_SYSTEM
  62 SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
  63                            TheISA::ITB *_itb, TheISA::DTB *_dtb,
  64                            bool use_kernel_stats)
  65     : ThreadState(_cpu, -1, _thread_num), cpu(_cpu), system(_sys), itb(_itb),
  66       dtb(_dtb)
  67
  68 {
  69     tc = new ProxyThreadContext<SimpleThread>(this);
  70
  71     quiesceEvent = new EndQuiesceEvent(tc);
  72
  73     regs.clear();
  74
  75     if (cpu->params->profile) {
  76         profile = new FunctionProfile(system->kernelSymtab);
  77         Callback *cb =
  78             new MakeCallback<SimpleThread,
  79             &SimpleThread::dumpFuncProfile>(this);
  80         registerExitCallback(cb);
  81     }
  82
  83     // let's fill with a dummy node for now so we don't get a segfault
  84     // on the first cycle when there's no node available.
  85     static ProfileNode dummyNode;
  86     profileNode = &dummyNode;
  87     profilePC = 3;
  88
  89     if (use_kernel_stats) {
  90         kernelStats = new TheISA::Kernel::Statistics(system);
  91     } else {
  92         kernelStats = NULL;
  93     }
  94 }
  95 #else
  96 SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num,
  97                          Process *_process, int _asid)
  98     : ThreadState(_cpu, -1, _thread_num, _process, _asid),
  99       cpu(_cpu)
 100 {
 101     regs.clear();
 102     tc = new ProxyThreadContext<SimpleThread>(this);
 103 }
 104
 105 #endif
 106
 107 SimpleThread::SimpleThread()
 108 #if FULL_SYSTEM
 109     : ThreadState(NULL, -1, -1)
 110 #else
 111     : ThreadState(NULL, -1, -1, NULL, -1)
 112 #endif
 113 {
 114     tc = new ProxyThreadContext<SimpleThread>(this);
 115     regs.clear();
 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::Unallocated);
 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     cpuId = oldContext->readCpuId();
 184 #if !FULL_SYSTEM
 185     funcExeInst = oldContext->readFuncExeInst();
 186 #endif
 187     inst = oldContext->getInst();
 188 }
 189
 190 void
 191 SimpleThread::serialize(ostream &os)
 192 {
 193     ThreadState::serialize(os);
 194     regs.serialize(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(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(tid);
 226         return;
 227     }
 228
 229     _status = ThreadContext::Active;
 230
 231     // status() == Suspended
 232     cpu->activateContext(tid, 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->check_interrupts()) {
 247         assert(status() == ThreadContext::Active);
 248         return;
 249     }
 250 #endif
 251 */
 252     _status = ThreadContext::Suspended;
 253     cpu->suspendContext(tid);
 254 }
 255
 256 void
 257 SimpleThread::deallocate()
 258 {
 259     if (status() == ThreadContext::Unallocated)
 260         return;
 261
 262     _status = ThreadContext::Unallocated;
 263     cpu->deallocateContext(tid);
 264 }
 265
 266 void
 267 SimpleThread::halt()
 268 {
 269     if (status() == ThreadContext::Halted)
 270         return;
 271
 272     _status = ThreadContext::Halted;
 273     cpu->haltContext(tid);
 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
 292 #if FULL_SYSTEM
 293 VirtualPort*
 294 SimpleThread::getVirtPort(ThreadContext *src_tc)
 295 {
 296     if (!src_tc)
 297         return virtPort;
 298
 299     VirtualPort *vp = new VirtualPort("tc-vport", src_tc);
 300     connectToMemFunc(vp);
 301     return vp;
 302 }
 303
 304 void
 305 SimpleThread::delVirtPort(VirtualPort *vp)
 306 {
 307     if (vp != virtPort) {
 308         vp->removeConn();
 309         delete vp;
 310     }
 311 }
 312
 313 #endif
 314