cpu/exec_context.cc

   1 /*
   2  * Copyright (c) 2003 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_cpu.hh"
  32 #include "cpu/exec_context.hh"
  33
  34 #ifdef FULL_SYSTEM
  35 #include "sim/system.hh"
  36 #else
  37 #include "sim/process.hh"
  38 #endif
  39
  40 using namespace std;
  41
  42 // constructor
  43 #ifdef FULL_SYSTEM
  44 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
  45                          AlphaItb *_itb, AlphaDtb *_dtb,
  46                          FunctionalMemory *_mem)
  47     : _status(ExecContext::Unallocated),
  48       kernelStats(this, _cpu), cpu(_cpu), thread_num(_thread_num),
  49       cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys),
  50       memCtrl(_sys->memCtrl), physmem(_sys->physmem),
  51       swCtx(NULL), func_exe_inst(0), storeCondFailures(0)
  52 {
  53     memset(&regs, 0, sizeof(RegFile));
  54 }
  55 #else
  56 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  57                          Process *_process, int _asid)
  58     : _status(ExecContext::Unallocated),
  59       cpu(_cpu), thread_num(_thread_num), cpu_id(-1),
  60       process(_process), mem(process->getMemory()), asid(_asid),
  61       func_exe_inst(0), storeCondFailures(0)
  62 {
  63 }
  64
  65 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  66                          FunctionalMemory *_mem, int _asid)
  67     : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
  68       func_exe_inst(0), storeCondFailures(0)
  69 {
  70 }
  71 #endif
  72
  73
  74 void
  75 ExecContext::takeOverFrom(ExecContext *oldContext)
  76 {
  77     // some things should already be set up
  78     assert(mem == oldContext->mem);
  79 #ifdef FULL_SYSTEM
  80     assert(system == oldContext->system);
  81 #else
  82     assert(process == oldContext->process);
  83 #endif
  84
  85     // copy over functional state
  86     _status = oldContext->_status;
  87 #ifdef FULL_SYSTEM
  88     kernelStats = oldContext->kernelStats;
  89 #endif
  90     regs = oldContext->regs;
  91     cpu_id = oldContext->cpu_id;
  92     func_exe_inst = oldContext->func_exe_inst;
  93
  94     storeCondFailures = 0;
  95
  96     oldContext->_status = ExecContext::Unallocated;
  97 }
  98
  99
 100 void
 101 ExecContext::serialize(ostream &os)
 102 {
 103     SERIALIZE_ENUM(_status);
 104     regs.serialize(os);
 105     // thread_num and cpu_id are deterministic from the config
 106     SERIALIZE_SCALAR(func_exe_inst);
 107
 108 #ifdef FULL_SYSTEM
 109     bool ctx = false;
 110     if (swCtx) {
 111         ctx = true;
 112         SERIALIZE_SCALAR(ctx);
 113         SERIALIZE_SCALAR(swCtx->calls);
 114         std::stack<fnCall *> *stack = &(swCtx->callStack);
 115         fnCall *top;
 116         int size = stack->size();
 117         SERIALIZE_SCALAR(size);
 118
 119         for (int j=0; j<size; ++j) {
 120             top = stack->top();
 121             paramOut(os, csprintf("stackpos[%d]",j), top->name);
 122             delete top;
 123             stack->pop();
 124         }
 125     } else {
 126         SERIALIZE_SCALAR(ctx);
 127     }
 128     if (system->bin) {
 129         Statistics::MainBin *cur = Statistics::MainBin::curBin();
 130         string bin_name = cur->name();
 131         SERIALIZE_SCALAR(bin_name);
 132     }
 133 #endif //FULL_SYSTEM
 134 }
 135
 136
 137 void
 138 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 139 {
 140     UNSERIALIZE_ENUM(_status);
 141     regs.unserialize(cp, section);
 142     // thread_num and cpu_id are deterministic from the config
 143     UNSERIALIZE_SCALAR(func_exe_inst);
 144
 145 #ifdef FULL_SYSTEM
 146     bool ctx;
 147     UNSERIALIZE_SCALAR(ctx);
 148     if (ctx) {
 149         swCtx = new SWContext;
 150         UNSERIALIZE_SCALAR(swCtx->calls);
 151         int size;
 152         UNSERIALIZE_SCALAR(size);
 153
 154         vector<fnCall *> calls;
 155         fnCall *call;
 156         for (int i=0; i<size; ++i) {
 157             call = new fnCall;
 158             paramIn(cp, section, csprintf("stackpos[%d]",i), call->name);
 159             call->myBin = system->getBin(call->name);
 160             calls.push_back(call);
 161         }
 162
 163         for (int i=size-1; i>=0; --i) {
 164             swCtx->callStack.push(calls[i]);
 165         }
 166
 167     }
 168
 169     if (system->bin) {
 170         string bin_name;
 171         UNSERIALIZE_SCALAR(bin_name);
 172         system->getBin(bin_name)->activate();
 173     }
 174 #endif //FULL_SYSTEM
 175 }
 176
 177
 178 void
 179 ExecContext::activate(int delay)
 180 {
 181     if (status() == Active)
 182         return;
 183
 184     _status = Active;
 185     cpu->activateContext(thread_num, delay);
 186 }
 187
 188 void
 189 ExecContext::suspend()
 190 {
 191     if (status() == Suspended)
 192         return;
 193
 194 #ifdef FULL_SYSTEM
 195     // Don't change the status from active if there are pending interrupts
 196     if (cpu->check_interrupts()) {
 197         assert(status() == Active);
 198         return;
 199     }
 200 #endif
 201
 202     _status = Suspended;
 203     cpu->suspendContext(thread_num);
 204 }
 205
 206 void
 207 ExecContext::deallocate()
 208 {
 209     if (status() == Unallocated)
 210         return;
 211
 212     _status = Unallocated;
 213     cpu->deallocateContext(thread_num);
 214 }
 215
 216 void
 217 ExecContext::halt()
 218 {
 219     if (status() == Halted)
 220         return;
 221
 222     _status = Halted;
 223     cpu->haltContext(thread_num);
 224 }
 225
 226
 227 void
 228 ExecContext::regStats(const string &name)
 229 {
 230 #ifdef FULL_SYSTEM
 231     kernelStats.regStats(name + ".kern");
 232 #endif
 233 }