cpu/exec_context.cc

   1 /*
   2  * Copyright (c) 2001-2004 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     memset(&regs, 0, sizeof(RegFile));
  64 }
  65
  66 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  67                          FunctionalMemory *_mem, int _asid)
  68     : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
  69       func_exe_inst(0), storeCondFailures(0)
  70 {
  71     memset(&regs, 0, sizeof(RegFile));
  72 }
  73 #endif
  74
  75
  76 void
  77 ExecContext::takeOverFrom(ExecContext *oldContext)
  78 {
  79     // some things should already be set up
  80     assert(mem == oldContext->mem);
  81 #ifdef FULL_SYSTEM
  82     assert(system == oldContext->system);
  83 #else
  84     assert(process == oldContext->process);
  85 #endif
  86
  87     // copy over functional state
  88     _status = oldContext->_status;
  89 #ifdef FULL_SYSTEM
  90     kernelStats = oldContext->kernelStats;
  91 #endif
  92     regs = oldContext->regs;
  93     cpu_id = oldContext->cpu_id;
  94     func_exe_inst = oldContext->func_exe_inst;
  95
  96     storeCondFailures = 0;
  97
  98     oldContext->_status = ExecContext::Unallocated;
  99 }
 100
 101
 102 void
 103 ExecContext::serialize(ostream &os)
 104 {
 105     SERIALIZE_ENUM(_status);
 106     regs.serialize(os);
 107     // thread_num and cpu_id are deterministic from the config
 108     SERIALIZE_SCALAR(func_exe_inst);
 109     SERIALIZE_SCALAR(inst);
 110
 111 #ifdef FULL_SYSTEM
 112     bool ctx = false;
 113     if (swCtx) {
 114         ctx = true;
 115         SERIALIZE_SCALAR(ctx);
 116         SERIALIZE_SCALAR(swCtx->calls);
 117         std::stack<fnCall *> *stack = &(swCtx->callStack);
 118         fnCall *top;
 119         int size = stack->size();
 120         SERIALIZE_SCALAR(size);
 121
 122         for (int j=0; j<size; ++j) {
 123             top = stack->top();
 124             paramOut(os, csprintf("stackpos[%d]",j), top->name);
 125             delete top;
 126             stack->pop();
 127         }
 128     } else {
 129         SERIALIZE_SCALAR(ctx);
 130     }
 131     if (system->bin) {
 132         Stats::MainBin *cur = Stats::MainBin::curBin();
 133         string bin_name = cur->name();
 134         SERIALIZE_SCALAR(bin_name);
 135     }
 136 #endif //FULL_SYSTEM
 137 }
 138
 139
 140 void
 141 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 142 {
 143     UNSERIALIZE_ENUM(_status);
 144     regs.unserialize(cp, section);
 145     // thread_num and cpu_id are deterministic from the config
 146     UNSERIALIZE_SCALAR(func_exe_inst);
 147     UNSERIALIZE_SCALAR(inst);
 148
 149 #ifdef FULL_SYSTEM
 150     bool ctx;
 151     UNSERIALIZE_SCALAR(ctx);
 152     if (ctx) {
 153         swCtx = new SWContext;
 154         UNSERIALIZE_SCALAR(swCtx->calls);
 155         int size;
 156         UNSERIALIZE_SCALAR(size);
 157
 158         vector<fnCall *> calls;
 159         fnCall *call;
 160         for (int i=0; i<size; ++i) {
 161             call = new fnCall;
 162             paramIn(cp, section, csprintf("stackpos[%d]",i), call->name);
 163             call->myBin = system->getBin(call->name);
 164             calls.push_back(call);
 165         }
 166
 167         for (int i=size-1; i>=0; --i) {
 168             swCtx->callStack.push(calls[i]);
 169         }
 170
 171     }
 172
 173     if (system->bin) {
 174         string bin_name;
 175         UNSERIALIZE_SCALAR(bin_name);
 176         system->getBin(bin_name)->activate();
 177     }
 178 #endif //FULL_SYSTEM
 179 }
 180
 181
 182 void
 183 ExecContext::activate(int delay)
 184 {
 185     if (status() == Active)
 186         return;
 187
 188     _status = Active;
 189     cpu->activateContext(thread_num, delay);
 190 }
 191
 192 void
 193 ExecContext::suspend()
 194 {
 195     if (status() == Suspended)
 196         return;
 197
 198 #ifdef FULL_SYSTEM
 199     // Don't change the status from active if there are pending interrupts
 200     if (cpu->check_interrupts()) {
 201         assert(status() == Active);
 202         return;
 203     }
 204 #endif
 205
 206     _status = Suspended;
 207     cpu->suspendContext(thread_num);
 208 }
 209
 210 void
 211 ExecContext::deallocate()
 212 {
 213     if (status() == Unallocated)
 214         return;
 215
 216     _status = Unallocated;
 217     cpu->deallocateContext(thread_num);
 218 }
 219
 220 void
 221 ExecContext::halt()
 222 {
 223     if (status() == Halted)
 224         return;
 225
 226     _status = Halted;
 227     cpu->haltContext(thread_num);
 228 }
 229
 230
 231 void
 232 ExecContext::regStats(const string &name)
 233 {
 234 #ifdef FULL_SYSTEM
 235     kernelStats.regStats(name + ".kern");
 236 #endif
 237 }
 238
 239 void
 240 ExecContext::trap(Fault fault)
 241 {
 242     //TheISA::trap(fault);    //One possible way to do it...
 243
 244     /** @todo: Going to hack it for now.  Do a true fixup later. */
 245 #ifdef FULL_SYSTEM
 246     ev5_trap(fault);
 247 #else
 248     fatal("fault (%d) detected @ PC 0x%08p", fault, readPC());
 249 #endif
 250 }