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/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)
  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       func_exe_insn(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_insn(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_insn(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_insn = oldContext->func_exe_insn;
  93
  94     storeCondFailures = 0;
  95
  96     oldContext->_status = ExecContext::Unallocated;
  97 }
  98
  99
 100 void
 101 ExecContext::setStatus(Status new_status)
 102 {
 103 #ifdef FULL_SYSTEM
 104     if (status() == new_status)
 105         return;
 106
 107     // Don't change the status from active if there are pending interrupts
 108     if (new_status == Suspended && cpu->check_interrupts()) {
 109         assert(status() == Active);
 110         return;
 111     }
 112 #endif
 113
 114     _status = new_status;
 115     cpu->execCtxStatusChg(thread_num);
 116 }
 117
 118 void
 119 ExecContext::regStats(const string &name)
 120 {
 121 #ifdef FULL_SYSTEM
 122     kernelStats.regStats(name + ".kern");
 123 #endif
 124 }