cpu/exec_context.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
  29 #include <string>
  30
  31 #include "cpu/base.hh"
  32 #include "cpu/exec_context.hh"
  33
  34 #if FULL_SYSTEM
  35 #include "base/callback.hh"
  36 #include "base/cprintf.hh"
  37 #include "base/output.hh"
  38 #include "base/trace.hh"
  39 #include "cpu/profile.hh"
  40 #include "kern/kernel_stats.hh"
  41 #include "sim/serialize.hh"
  42 #include "sim/sim_exit.hh"
  43 #include "sim/system.hh"
  44 #include "arch/stacktrace.hh"
  45 #else
  46 #include "sim/process.hh"
  47 #endif
  48
  49 using namespace std;
  50
  51 // constructor
  52 #if FULL_SYSTEM
  53 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
  54                          AlphaITB *_itb, AlphaDTB *_dtb,
  55                          FunctionalMemory *_mem)
  56     : _status(ExecContext::Unallocated), cpu(_cpu), thread_num(_thread_num),
  57       cpu_id(-1), lastActivate(0), lastSuspend(0), mem(_mem), itb(_itb),
  58       dtb(_dtb), system(_sys), memctrl(_sys->memctrl), physmem(_sys->physmem),
  59       kernelBinning(system->kernelBinning), bin(kernelBinning->bin),
  60       fnbin(kernelBinning->fnbin), profile(NULL), quiesceEvent(this),
  61       func_exe_inst(0), storeCondFailures(0)
  62 {
  63     kernelStats = new Kernel::Statistics(this);
  64     memset(&regs, 0, sizeof(RegFile));
  65
  66     if (cpu->params->profile) {
  67         profile = new FunctionProfile(system->kernelSymtab);
  68         Callback *cb =
  69             new MakeCallback<ExecContext, &ExecContext::dumpFuncProfile>(this);
  70         registerExitCallback(cb);
  71     }
  72
  73     // let's fill with a dummy node for now so we don't get a segfault
  74     // on the first cycle when there's no node available.
  75     static ProfileNode dummyNode;
  76     profileNode = &dummyNode;
  77     profilePC = 3;
  78 }
  79 #else
  80 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  81                          Process *_process, int _asid)
  82     : _status(ExecContext::Unallocated),
  83       cpu(_cpu), thread_num(_thread_num), cpu_id(-1), lastActivate(0),
  84       lastSuspend(0), process(_process), mem(process->getMemory()), asid(_asid),
  85       func_exe_inst(0), storeCondFailures(0)
  86 {
  87     memset(&regs, 0, sizeof(RegFile));
  88 }
  89
  90 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  91                          FunctionalMemory *_mem, int _asid)
  92     : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
  93       func_exe_inst(0), storeCondFailures(0)
  94 {
  95     memset(&regs, 0, sizeof(RegFile));
  96 }
  97 #endif
  98
  99 ExecContext::~ExecContext()
 100 {
 101 #if FULL_SYSTEM
 102     delete kernelStats;
 103 #endif
 104 }
 105
 106 #if FULL_SYSTEM
 107 void
 108 ExecContext::dumpFuncProfile()
 109 {
 110     std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
 111     profile->dump(this, *os);
 112 }
 113
 114 ExecContext::EndQuiesceEvent::EndQuiesceEvent(ExecContext *_xc)
 115     : Event(&mainEventQueue), xc(_xc)
 116 {
 117 }
 118
 119 void
 120 ExecContext::EndQuiesceEvent::process()
 121 {
 122     xc->activate();
 123 }
 124
 125 const char*
 126 ExecContext::EndQuiesceEvent::description()
 127 {
 128     return "End Quiesce Event.";
 129 }
 130 #endif
 131
 132 void
 133 ExecContext::takeOverFrom(ExecContext *oldContext)
 134 {
 135     // some things should already be set up
 136     assert(mem == oldContext->mem);
 137 #if FULL_SYSTEM
 138     assert(system == oldContext->system);
 139 #else
 140     assert(process == oldContext->process);
 141 #endif
 142
 143     // copy over functional state
 144     _status = oldContext->_status;
 145     regs = oldContext->regs;
 146     cpu_id = oldContext->cpu_id;
 147     func_exe_inst = oldContext->func_exe_inst;
 148
 149     storeCondFailures = 0;
 150
 151     oldContext->_status = ExecContext::Unallocated;
 152 }
 153
 154 void
 155 ExecContext::serialize(ostream &os)
 156 {
 157     SERIALIZE_ENUM(_status);
 158     regs.serialize(os);
 159     // thread_num and cpu_id are deterministic from the config
 160     SERIALIZE_SCALAR(func_exe_inst);
 161     SERIALIZE_SCALAR(inst);
 162
 163 #if FULL_SYSTEM
 164     Tick quiesceEndTick = 0;
 165     if (quiesceEvent.scheduled())
 166         quiesceEndTick = quiesceEvent.when();
 167     SERIALIZE_SCALAR(quiesceEndTick);
 168     kernelStats->serialize(os);
 169
 170 #endif
 171 }
 172
 173
 174 void
 175 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 176 {
 177     UNSERIALIZE_ENUM(_status);
 178     regs.unserialize(cp, section);
 179     // thread_num and cpu_id are deterministic from the config
 180     UNSERIALIZE_SCALAR(func_exe_inst);
 181     UNSERIALIZE_SCALAR(inst);
 182
 183 #if FULL_SYSTEM
 184     Tick quiesceEndTick;
 185     UNSERIALIZE_SCALAR(quiesceEndTick);
 186     if (quiesceEndTick)
 187         quiesceEvent.schedule(quiesceEndTick);
 188
 189     kernelStats->unserialize(cp, section);
 190 #endif
 191 }
 192
 193
 194 void
 195 ExecContext::activate(int delay)
 196 {
 197     if (status() == Active)
 198         return;
 199
 200     lastActivate = curTick;
 201
 202     _status = Active;
 203     cpu->activateContext(thread_num, delay);
 204 }
 205
 206 void
 207 ExecContext::suspend()
 208 {
 209     if (status() == Suspended)
 210         return;
 211
 212     lastActivate = curTick;
 213     lastSuspend = curTick;
 214 /*
 215 #if FULL_SYSTEM
 216     // Don't change the status from active if there are pending interrupts
 217     if (cpu->check_interrupts()) {
 218         assert(status() == Active);
 219         return;
 220     }
 221 #endif
 222 */
 223     _status = Suspended;
 224     cpu->suspendContext(thread_num);
 225 }
 226
 227 void
 228 ExecContext::deallocate()
 229 {
 230     if (status() == Unallocated)
 231         return;
 232
 233     _status = Unallocated;
 234     cpu->deallocateContext(thread_num);
 235 }
 236
 237 void
 238 ExecContext::halt()
 239 {
 240     if (status() == Halted)
 241         return;
 242
 243     _status = Halted;
 244     cpu->haltContext(thread_num);
 245 }
 246
 247
 248 void
 249 ExecContext::regStats(const string &name)
 250 {
 251 #if FULL_SYSTEM
 252     kernelStats->regStats(name + ".kern");
 253 #endif
 254 }
 255