cpu/exec_context.cc

   1 /*
   2  * Copyright (c) 2001-2005 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 "cpu/profile.hh"
  39 #include "kern/kernel_stats.hh"
  40 #include "sim/serialize.hh"
  41 #include "sim/sim_exit.hh"
  42 #include "sim/system.hh"
  43 #include "targetarch/stacktrace.hh"
  44 #else
  45 #include "sim/process.hh"
  46 #endif
  47
  48 using namespace std;
  49
  50 // constructor
  51 #if FULL_SYSTEM
  52 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
  53                          AlphaITB *_itb, AlphaDTB *_dtb,
  54                          FunctionalMemory *_mem)
  55     : _status(ExecContext::Unallocated), cpu(_cpu), thread_num(_thread_num),
  56       cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys),
  57       memctrl(_sys->memctrl), physmem(_sys->physmem),
  58       kernelBinning(system->kernelBinning), bin(kernelBinning->bin),
  59       fnbin(kernelBinning->fnbin), profile(NULL),
  60       func_exe_inst(0), storeCondFailures(0)
  61 {
  62     kernelStats = new Kernel::Statistics(this);
  63     memset(&regs, 0, sizeof(RegFile));
  64
  65     if (cpu->params->profile) {
  66         profile = new FunctionProfile(system->kernelSymtab);
  67         Callback *cb =
  68             new MakeCallback<ExecContext, &ExecContext::dumpFuncProfile>(this);
  69         registerExitCallback(cb);
  70     }
  71
  72     // let's fill with a dummy node for now so we don't get a segfault
  73     // on the first cycle when there's no node available.
  74     static ProfileNode dummyNode;
  75     profileNode = &dummyNode;
  76     profilePC = 3;
  77 }
  78 #else
  79 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  80                          Process *_process, int _asid)
  81     : _status(ExecContext::Unallocated),
  82       cpu(_cpu), thread_num(_thread_num), cpu_id(-1),
  83       process(_process), mem(process->getMemory()), asid(_asid),
  84       func_exe_inst(0), storeCondFailures(0)
  85 {
  86     memset(&regs, 0, sizeof(RegFile));
  87 }
  88
  89 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  90                          FunctionalMemory *_mem, int _asid)
  91     : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
  92       func_exe_inst(0), storeCondFailures(0)
  93 {
  94     memset(&regs, 0, sizeof(RegFile));
  95 }
  96 #endif
  97
  98 ExecContext::~ExecContext()
  99 {
 100 #if FULL_SYSTEM
 101     delete kernelStats;
 102 #endif
 103 }
 104
 105 #if FULL_SYSTEM
 106 void
 107 ExecContext::dumpFuncProfile()
 108 {
 109     std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
 110     profile->dump(this, *os);
 111 }
 112 #endif
 113
 114 void
 115 ExecContext::takeOverFrom(ExecContext *oldContext)
 116 {
 117     // some things should already be set up
 118     assert(mem == oldContext->mem);
 119 #if FULL_SYSTEM
 120     assert(system == oldContext->system);
 121 #else
 122     assert(process == oldContext->process);
 123 #endif
 124
 125     // copy over functional state
 126     _status = oldContext->_status;
 127     regs = oldContext->regs;
 128     cpu_id = oldContext->cpu_id;
 129     func_exe_inst = oldContext->func_exe_inst;
 130
 131     storeCondFailures = 0;
 132
 133     oldContext->_status = ExecContext::Unallocated;
 134 }
 135
 136 void
 137 ExecContext::serialize(ostream &os)
 138 {
 139     SERIALIZE_ENUM(_status);
 140     regs.serialize(os);
 141     // thread_num and cpu_id are deterministic from the config
 142     SERIALIZE_SCALAR(func_exe_inst);
 143     SERIALIZE_SCALAR(inst);
 144
 145 #if FULL_SYSTEM
 146     kernelStats->serialize(os);
 147 #endif
 148 }
 149
 150
 151 void
 152 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 153 {
 154     UNSERIALIZE_ENUM(_status);
 155     regs.unserialize(cp, section);
 156     // thread_num and cpu_id are deterministic from the config
 157     UNSERIALIZE_SCALAR(func_exe_inst);
 158     UNSERIALIZE_SCALAR(inst);
 159
 160 #if FULL_SYSTEM
 161     kernelStats->unserialize(cp, section);
 162 #endif
 163 }
 164
 165
 166 void
 167 ExecContext::activate(int delay)
 168 {
 169     if (status() == Active)
 170         return;
 171
 172     _status = Active;
 173     cpu->activateContext(thread_num, delay);
 174 }
 175
 176 void
 177 ExecContext::suspend()
 178 {
 179     if (status() == Suspended)
 180         return;
 181
 182 #if FULL_SYSTEM
 183     // Don't change the status from active if there are pending interrupts
 184     if (cpu->check_interrupts()) {
 185         assert(status() == Active);
 186         return;
 187     }
 188 #endif
 189
 190     _status = Suspended;
 191     cpu->suspendContext(thread_num);
 192 }
 193
 194 void
 195 ExecContext::deallocate()
 196 {
 197     if (status() == Unallocated)
 198         return;
 199
 200     _status = Unallocated;
 201     cpu->deallocateContext(thread_num);
 202 }
 203
 204 void
 205 ExecContext::halt()
 206 {
 207     if (status() == Halted)
 208         return;
 209
 210     _status = Halted;
 211     cpu->haltContext(thread_num);
 212 }
 213
 214
 215 void
 216 ExecContext::regStats(const string &name)
 217 {
 218 #if FULL_SYSTEM
 219     kernelStats->regStats(name + ".kern");
 220 #endif
 221 }
 222
 223 void
 224 ExecContext::trap(Fault fault)
 225 {
 226     //TheISA::trap(fault);    //One possible way to do it...
 227
 228     /** @todo: Going to hack it for now.  Do a true fixup later. */
 229 #if FULL_SYSTEM
 230     ev5_trap(fault);
 231 #else
 232     fatal("fault (%d) detected @ PC 0x%08p", fault, readPC());
 233 #endif
 234 }