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 "base/cprintf.hh"
  36 #include "kern/kernel_stats.hh"
  37 #include "sim/serialize.hh"
  38 #include "sim/system.hh"
  39 #else
  40 #include "sim/process.hh"
  41 #endif
  42
  43 using namespace std;
  44
  45 // constructor
  46 #ifdef FULL_SYSTEM
  47 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
  48                          AlphaITB *_itb, AlphaDTB *_dtb,
  49                          FunctionalMemory *_mem)
  50     : _status(ExecContext::Unallocated), cpu(_cpu), thread_num(_thread_num),
  51       cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys),
  52       memctrl(_sys->memctrl), physmem(_sys->physmem),
  53       kernelBinning(system->kernelBinning), bin(kernelBinning->bin),
  54       fnbin(kernelBinning->fnbin), func_exe_inst(0), storeCondFailures(0)
  55 {
  56     kernelStats = new Kernel::Statistics(this);
  57     memset(&regs, 0, sizeof(RegFile));
  58 }
  59 #else
  60 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  61                          Process *_process, int _asid)
  62     : _status(ExecContext::Unallocated),
  63       cpu(_cpu), thread_num(_thread_num), cpu_id(-1),
  64       process(_process), mem(process->getMemory()), asid(_asid),
  65       func_exe_inst(0), storeCondFailures(0)
  66 {
  67     memset(&regs, 0, sizeof(RegFile));
  68 }
  69
  70 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  71                          FunctionalMemory *_mem, int _asid)
  72     : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
  73       func_exe_inst(0), storeCondFailures(0)
  74 {
  75     memset(&regs, 0, sizeof(RegFile));
  76 }
  77 #endif
  78
  79 ExecContext::~ExecContext()
  80 {
  81 #ifdef FULL_SYSTEM
  82     delete kernelStats;
  83 #endif
  84 }
  85
  86
  87 void
  88 ExecContext::takeOverFrom(ExecContext *oldContext)
  89 {
  90     // some things should already be set up
  91     assert(mem == oldContext->mem);
  92 #ifdef FULL_SYSTEM
  93     assert(system == oldContext->system);
  94 #else
  95     assert(process == oldContext->process);
  96 #endif
  97
  98     // copy over functional state
  99     _status = oldContext->_status;
 100     regs = oldContext->regs;
 101     cpu_id = oldContext->cpu_id;
 102     func_exe_inst = oldContext->func_exe_inst;
 103
 104     storeCondFailures = 0;
 105
 106     oldContext->_status = ExecContext::Unallocated;
 107 }
 108
 109 #ifdef FULL_SYSTEM
 110 void
 111 ExecContext::execute(const StaticInstBase *inst)
 112 {
 113     assert(kernelStats);
 114     system->kernelBinning->execute(this, inst);
 115 }
 116 #endif
 117
 118 void
 119 ExecContext::serialize(ostream &os)
 120 {
 121     SERIALIZE_ENUM(_status);
 122     regs.serialize(os);
 123     // thread_num and cpu_id are deterministic from the config
 124     SERIALIZE_SCALAR(func_exe_inst);
 125     SERIALIZE_SCALAR(inst);
 126
 127 #ifdef FULL_SYSTEM
 128     kernelStats->serialize(os);
 129 #endif
 130 }
 131
 132
 133 void
 134 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 135 {
 136     UNSERIALIZE_ENUM(_status);
 137     regs.unserialize(cp, section);
 138     // thread_num and cpu_id are deterministic from the config
 139     UNSERIALIZE_SCALAR(func_exe_inst);
 140     UNSERIALIZE_SCALAR(inst);
 141
 142 #ifdef FULL_SYSTEM
 143     kernelStats->unserialize(cp, section);
 144 #endif
 145 }
 146
 147
 148 void
 149 ExecContext::activate(int delay)
 150 {
 151     if (status() == Active)
 152         return;
 153
 154     _status = Active;
 155     cpu->activateContext(thread_num, delay);
 156 }
 157
 158 void
 159 ExecContext::suspend()
 160 {
 161     if (status() == Suspended)
 162         return;
 163
 164 #ifdef FULL_SYSTEM
 165     // Don't change the status from active if there are pending interrupts
 166     if (cpu->check_interrupts()) {
 167         assert(status() == Active);
 168         return;
 169     }
 170 #endif
 171
 172     _status = Suspended;
 173     cpu->suspendContext(thread_num);
 174 }
 175
 176 void
 177 ExecContext::deallocate()
 178 {
 179     if (status() == Unallocated)
 180         return;
 181
 182     _status = Unallocated;
 183     cpu->deallocateContext(thread_num);
 184 }
 185
 186 void
 187 ExecContext::halt()
 188 {
 189     if (status() == Halted)
 190         return;
 191
 192     _status = Halted;
 193     cpu->haltContext(thread_num);
 194 }
 195
 196
 197 void
 198 ExecContext::regStats(const string &name)
 199 {
 200 #ifdef FULL_SYSTEM
 201     kernelStats->regStats(name + ".kern");
 202 #endif
 203 }
 204
 205 void
 206 ExecContext::trap(Fault fault)
 207 {
 208     //TheISA::trap(fault);    //One possible way to do it...
 209
 210     /** @todo: Going to hack it for now.  Do a true fixup later. */
 211 #ifdef FULL_SYSTEM
 212     ev5_trap(fault);
 213 #else
 214     fatal("fault (%d) detected @ PC 0x%08p", fault, readPC());
 215 #endif
 216 }