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 "base/callback.hh"
  43 #include "base/cprintf.hh"
  44 #include "base/output.hh"
  45 #include "base/trace.hh"
  46 #include "cpu/profile.hh"
  47 #include "cpu/quiesce_event.hh"
  48 #include "kern/kernel_stats.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                            AlphaITB *_itb, AlphaDTB *_dtb,
  64                            bool use_kernel_stats)
  65     : ThreadState(-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 Kernel::Statistics(system);
  91     } else {
  92         kernelStats = NULL;
  93     }
  94     Port *mem_port;
  95     physPort = new FunctionalPort(csprintf("%s-%d-funcport",
  96                                            cpu->name(), tid));
  97     mem_port = system->physmem->getPort("functional");
  98     mem_port->setPeer(physPort);
  99     physPort->setPeer(mem_port);
 100
 101     virtPort = new VirtualPort(csprintf("%s-%d-vport",
 102                                         cpu->name(), tid));
 103     mem_port = system->physmem->getPort("functional");
 104     mem_port->setPeer(virtPort);
 105     virtPort->setPeer(mem_port);
 106 }
 107 #else
 108 SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num,
 109                          Process *_process, int _asid, MemObject* memobj)
 110     : ThreadState(-1, _thread_num, _process, _asid, memobj),
 111       cpu(_cpu)
 112 {
 113     /* Use this port to for syscall emulation writes to memory. */
 114     Port *mem_port;
 115     port = new TranslatingPort(csprintf("%s-%d-funcport",
 116                                         cpu->name(), tid),
 117                                process->pTable, false);
 118     mem_port = memobj->getPort("functional");
 119     mem_port->setPeer(port);
 120     port->setPeer(mem_port);
 121
 122     regs.clear();
 123     tc = new ProxyThreadContext<SimpleThread>(this);
 124 }
 125
 126 #endif
 127
 128 SimpleThread::SimpleThread(ThreadContext *oldContext)
 129 #if FULL_SYSTEM
 130     : ThreadState(-1, -1)
 131 #else
 132     : ThreadState(-1, -1, NULL, -1, NULL)
 133 #endif
 134 {
 135     tc = new ProxyThreadContext<SimpleThread>(this);
 136     regs.clear();
 137
 138     copyState(oldContext);
 139
 140 #if FULL_SYSTEM
 141     EndQuiesceEvent *quiesce = oldContext->getQuiesceEvent();
 142     if (quiesce) {
 143         quiesceEvent = quiesce;
 144     }
 145     Kernel::Statistics *stats = oldContext->getKernelStats();
 146     if (stats) {
 147         kernelStats = stats;
 148     }
 149 #endif
 150 }
 151
 152 SimpleThread::~SimpleThread()
 153 {
 154     delete tc;
 155 }
 156
 157 void
 158 SimpleThread::takeOverFrom(ThreadContext *oldContext)
 159 {
 160     // some things should already be set up
 161 #if FULL_SYSTEM
 162     assert(system == oldContext->getSystemPtr());
 163 #else
 164     assert(process == oldContext->getProcessPtr());
 165 #endif
 166
 167     copyState(oldContext);
 168 #if FULL_SYSTEM
 169     EndQuiesceEvent *quiesce = oldContext->getQuiesceEvent();
 170     if (quiesce) {
 171         // Point the quiesce event's TC at this TC so that it wakes up
 172         // the proper CPU.
 173         quiesce->tc = tc;
 174     }
 175     if (quiesceEvent) {
 176         quiesceEvent->tc = tc;
 177     }
 178 #endif
 179
 180     storeCondFailures = 0;
 181
 182     oldContext->setStatus(ThreadContext::Unallocated);
 183 }
 184
 185 void
 186 SimpleThread::copyState(ThreadContext *oldContext)
 187 {
 188     // copy over functional state
 189     _status = oldContext->status();
 190     copyArchRegs(oldContext);
 191     cpuId = oldContext->readCpuId();
 192 #if !FULL_SYSTEM
 193     funcExeInst = oldContext->readFuncExeInst();
 194 #endif
 195 }
 196
 197 void
 198 SimpleThread::serialize(ostream &os)
 199 {
 200     ThreadState::serialize(os);
 201     regs.serialize(os);
 202     // thread_num and cpu_id are deterministic from the config
 203 }
 204
 205
 206 void
 207 SimpleThread::unserialize(Checkpoint *cp, const std::string &section)
 208 {
 209     ThreadState::unserialize(cp, section);
 210     regs.unserialize(cp, section);
 211     // thread_num and cpu_id are deterministic from the config
 212 }
 213
 214 #if FULL_SYSTEM
 215 void
 216 SimpleThread::dumpFuncProfile()
 217 {
 218     std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
 219     profile->dump(tc, *os);
 220 }
 221 #endif
 222
 223 void
 224 SimpleThread::activate(int delay)
 225 {
 226     if (status() == ThreadContext::Active)
 227         return;
 228
 229     lastActivate = curTick;
 230
 231     if (status() == ThreadContext::Unallocated) {
 232         cpu->activateWhenReady(tid);
 233         return;
 234     }
 235
 236     _status = ThreadContext::Active;
 237
 238     // status() == Suspended
 239     cpu->activateContext(tid, delay);
 240 }
 241
 242 void
 243 SimpleThread::suspend()
 244 {
 245     if (status() == ThreadContext::Suspended)
 246         return;
 247
 248     lastActivate = curTick;
 249     lastSuspend = curTick;
 250 /*
 251 #if FULL_SYSTEM
 252     // Don't change the status from active if there are pending interrupts
 253     if (cpu->check_interrupts()) {
 254         assert(status() == ThreadContext::Active);
 255         return;
 256     }
 257 #endif
 258 */
 259     _status = ThreadContext::Suspended;
 260     cpu->suspendContext(tid);
 261 }
 262
 263 void
 264 SimpleThread::deallocate()
 265 {
 266     if (status() == ThreadContext::Unallocated)
 267         return;
 268
 269     _status = ThreadContext::Unallocated;
 270     cpu->deallocateContext(tid);
 271 }
 272
 273 void
 274 SimpleThread::halt()
 275 {
 276     if (status() == ThreadContext::Halted)
 277         return;
 278
 279     _status = ThreadContext::Halted;
 280     cpu->haltContext(tid);
 281 }
 282
 283
 284 void
 285 SimpleThread::regStats(const string &name)
 286 {
 287 #if FULL_SYSTEM
 288     if (kernelStats)
 289         kernelStats->regStats(name + ".kern");
 290 #endif
 291 }
 292
 293 void
 294 SimpleThread::copyArchRegs(ThreadContext *src_tc)
 295 {
 296     TheISA::copyRegs(src_tc, tc);
 297 }
 298
 299 #if FULL_SYSTEM
 300 VirtualPort*
 301 SimpleThread::getVirtPort(ThreadContext *src_tc)
 302 {
 303     if (!src_tc)
 304         return virtPort;
 305
 306     VirtualPort *vp;
 307     Port *mem_port;
 308
 309     vp = new VirtualPort("tc-vport", src_tc);
 310     mem_port = system->physmem->getPort("functional");
 311     mem_port->setPeer(vp);
 312     vp->setPeer(mem_port);
 313     return vp;
 314 }
 315
 316 void
 317 SimpleThread::delVirtPort(VirtualPort *vp)
 318 {
 319     if (vp != virtPort) {
 320         delete vp->getPeer();
 321         delete vp;
 322     }
 323 }
 324
 325
 326 #endif
 327