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     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
 110 #ifdef FULL_SYSTEM
 111     bool ctx = false;
 112     if (swCtx) {
 113         ctx = true;
 114         SERIALIZE_SCALAR(ctx);
 115         SERIALIZE_SCALAR(swCtx->calls);
 116         std::stack<fnCall *> *stack = &(swCtx->callStack);
 117         fnCall *top;
 118         int size = stack->size();
 119         SERIALIZE_SCALAR(size);
 120
 121         for (int j=0; j<size; ++j) {
 122             top = stack->top();
 123             paramOut(os, csprintf("stackpos[%d]",j), top->name);
 124             delete top;
 125             stack->pop();
 126         }
 127     } else {
 128         SERIALIZE_SCALAR(ctx);
 129     }
 130     if (system->bin) {
 131         Statistics::MainBin *cur = Statistics::MainBin::curBin();
 132         string bin_name = cur->name();
 133         SERIALIZE_SCALAR(bin_name);
 134     }
 135 #endif //FULL_SYSTEM
 136 }
 137
 138
 139 void
 140 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 141 {
 142     UNSERIALIZE_ENUM(_status);
 143     regs.unserialize(cp, section);
 144     // thread_num and cpu_id are deterministic from the config
 145     UNSERIALIZE_SCALAR(func_exe_inst);
 146
 147 #ifdef FULL_SYSTEM
 148     bool ctx;
 149     UNSERIALIZE_SCALAR(ctx);
 150     if (ctx) {
 151         swCtx = new SWContext;
 152         UNSERIALIZE_SCALAR(swCtx->calls);
 153         int size;
 154         UNSERIALIZE_SCALAR(size);
 155
 156         vector<fnCall *> calls;
 157         fnCall *call;
 158         for (int i=0; i<size; ++i) {
 159             call = new fnCall;
 160             paramIn(cp, section, csprintf("stackpos[%d]",i), call->name);
 161             call->myBin = system->getBin(call->name);
 162             calls.push_back(call);
 163         }
 164
 165         for (int i=size-1; i>=0; --i) {
 166             swCtx->callStack.push(calls[i]);
 167         }
 168
 169     }
 170
 171     if (system->bin) {
 172         string bin_name;
 173         UNSERIALIZE_SCALAR(bin_name);
 174         system->getBin(bin_name)->activate();
 175     }
 176 #endif //FULL_SYSTEM
 177 }
 178
 179
 180 void
 181 ExecContext::activate(int delay)
 182 {
 183     if (status() == Active)
 184         return;
 185
 186     _status = Active;
 187     cpu->activateContext(thread_num, delay);
 188 }
 189
 190 void
 191 ExecContext::suspend()
 192 {
 193     if (status() == Suspended)
 194         return;
 195
 196 #ifdef FULL_SYSTEM
 197     // Don't change the status from active if there are pending interrupts
 198     if (cpu->check_interrupts()) {
 199         assert(status() == Active);
 200         return;
 201     }
 202 #endif
 203
 204     _status = Suspended;
 205     cpu->suspendContext(thread_num);
 206 }
 207
 208 void
 209 ExecContext::deallocate()
 210 {
 211     if (status() == Unallocated)
 212         return;
 213
 214     _status = Unallocated;
 215     cpu->deallocateContext(thread_num);
 216 }
 217
 218 void
 219 ExecContext::halt()
 220 {
 221     if (status() == Halted)
 222         return;
 223
 224     _status = Halted;
 225     cpu->haltContext(thread_num);
 226 }
 227
 228
 229 void
 230 ExecContext::regStats(const string &name)
 231 {
 232 #ifdef FULL_SYSTEM
 233     kernelStats.regStats(name + ".kern");
 234 #endif
 235 }