src/cpu/pc_event.cc

   1 /*
   2  * Copyright (c) 2002-2005 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 <algorithm>
  30 #include <map>
  31 #include <string>
  32 #include <utility>
  33
  34 #include "base/trace.hh"
  35 #include "config/full_system.hh"
  36 #include "cpu/base.hh"
  37 #include "cpu/exec_context.hh"
  38 #include "cpu/pc_event.hh"
  39 #include "sim/debug.hh"
  40 #include "sim/root.hh"
  41 #include "sim/system.hh"
  42
  43 using namespace std;
  44
  45 PCEventQueue::PCEventQueue()
  46 {}
  47
  48 PCEventQueue::~PCEventQueue()
  49 {}
  50
  51 bool
  52 PCEventQueue::remove(PCEvent *event)
  53 {
  54     int removed = 0;
  55     range_t range = equal_range(event);
  56     for (iterator i = range.first; i != range.second; ++i) {
  57         if (*i == event) {
  58             DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
  59                     event->pc(), event->descr());
  60             pc_map.erase(i);
  61             ++removed;
  62         }
  63     }
  64
  65     return removed > 0;
  66 }
  67
  68 bool
  69 PCEventQueue::schedule(PCEvent *event)
  70 {
  71     pc_map.push_back(event);
  72     sort(pc_map.begin(), pc_map.end(), MapCompare());
  73
  74     DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
  75             event->pc(), event->descr());
  76
  77     return true;
  78 }
  79
  80 bool
  81 PCEventQueue::doService(ExecContext *xc)
  82 {
  83     Addr pc = xc->readPC() & ~0x3;
  84     int serviced = 0;
  85     range_t range = equal_range(pc);
  86     for (iterator i = range.first; i != range.second; ++i) {
  87         // Make sure that the pc wasn't changed as the side effect of
  88         // another event.  This for example, prevents two invocations
  89         // of the SkipFuncEvent.  Maybe we should have separate PC
  90         // event queues for each processor?
  91         if (pc != (xc->readPC() & ~0x3))
  92             continue;
  93
  94         DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
  95                 (*i)->pc(), (*i)->descr());
  96
  97         (*i)->process(xc);
  98         ++serviced;
  99     }
 100
 101     return serviced > 0;
 102 }
 103
 104 void
 105 PCEventQueue::dump() const
 106 {
 107     const_iterator i = pc_map.begin();
 108     const_iterator e = pc_map.end();
 109
 110     for (; i != e; ++i)
 111         cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
 112                 (*i)->descr());
 113 }
 114
 115 PCEventQueue::range_t
 116 PCEventQueue::equal_range(Addr pc)
 117 {
 118     return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
 119 }
 120
 121 BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
 122                            bool del)
 123     : PCEvent(q, desc, addr), remove(del)
 124 {
 125 }
 126
 127 void
 128 BreakPCEvent::process(ExecContext *xc)
 129 {
 130     StringWrap name(xc->getCpuPtr()->name() + ".break_event");
 131     DPRINTFN("break event %s triggered\n", descr());
 132     debug_break();
 133     if (remove)
 134         delete this;
 135 }
 136
 137 #if FULL_SYSTEM
 138 extern "C"
 139 void
 140 sched_break_pc_sys(System *sys, Addr addr)
 141 {
 142     new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
 143 }
 144
 145 extern "C"
 146 void
 147 sched_break_pc(Addr addr)
 148 {
 149      for (vector<System *>::iterator sysi = System::systemList.begin();
 150           sysi != System::systemList.end(); ++sysi) {
 151          sched_break_pc_sys(*sysi, addr);
 152     }
 153
 154 }
 155 #endif