sim/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 "base_cpu.hh"
  32 #include "exec_context.hh"
  33
  34 #ifdef FULL_SYSTEM
  35 #include "system.hh"
  36 #else
  37 #include "prog.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, int _cpu_id)
  47     : kernelStats(this, _cpu), cpu(_cpu), thread_num(_thread_num), mem(_mem),
  48       itb(_itb), dtb(_dtb), cpu_id(_cpu_id), system(_sys),
  49       memCtrl(_sys->memCtrl), physmem(_sys->physmem)
  50 {
  51     memset(&regs, 0, sizeof(RegFile));
  52     _status = Active;
  53     func_exe_insn = 0;
  54     storeCondFailures = 0;
  55     system->registerExecContext(this);
  56 }
  57 #else
  58 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  59                          Process *_process, int _asid)
  60     : cpu(_cpu), thread_num(_thread_num), process(_process), asid (_asid)
  61 {
  62
  63     // Register with process object. Our 'active' will be set by the
  64     // process iff we're the initial context.  Others are reserved for
  65     // dynamically created threads.
  66     process->registerExecContext(this);
  67
  68     mem = process->getMemory();
  69
  70     func_exe_insn = 0;
  71     storeCondFailures = 0;
  72 }
  73
  74 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  75                          FunctionalMemory *_mem, int _asid)
  76     : cpu(_cpu), thread_num(_thread_num), process(NULL), mem(_mem),
  77       asid(_asid)
  78 {
  79 }
  80 #endif
  81
  82 void
  83 ExecContext::setStatus(Status new_status)
  84 {
  85 #ifdef FULL_SYSTEM
  86     if (status() == new_status)
  87         return;
  88
  89     // Don't change the status from active if there are pending interrupts
  90     if (new_status == Suspended && cpu->check_interrupts()) {
  91         assert(status() == Active);
  92         return;
  93     }
  94 #endif
  95
  96     _status = new_status;
  97     cpu->execCtxStatusChg();
  98 }
  99
 100 void
 101 ExecContext::regStats(const string &name)
 102 {
 103 #ifdef FULL_SYSTEM
 104     kernelStats.regStats(name + ".kern");
 105 #endif
 106 }