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  * Authors: Nathan Binkert
  29  *          Steve Reinhardt
  30  */
  31
  32 #include <algorithm>
  33 #include <map>
  34 #include <string>
  35 #include <utility>
  36
  37 #include "base/trace.hh"
  38 #include "config/full_system.hh"
  39 #include "cpu/base.hh"
  40 #include "cpu/exec_context.hh"
  41 #include "cpu/pc_event.hh"
  42 #include "sim/debug.hh"
  43 #include "sim/root.hh"
  44 #include "sim/system.hh"
  45
  46 using namespace std;
  47
  48 PCEventQueue::PCEventQueue()
  49 {}
  50
  51 PCEventQueue::~PCEventQueue()
  52 {}
  53
  54 bool
  55 PCEventQueue::remove(PCEvent *event)
  56 {
  57     int removed = 0;
  58     range_t range = equal_range(event);
  59     for (iterator i = range.first; i != range.second; ++i) {
  60         if (*i == event) {
  61             DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
  62                     event->pc(), event->descr());
  63             pc_map.erase(i);
  64             ++removed;
  65         }
  66     }
  67
  68     return removed > 0;
  69 }
  70
  71 bool
  72 PCEventQueue::schedule(PCEvent *event)
  73 {
  74     pc_map.push_back(event);
  75     sort(pc_map.begin(), pc_map.end(), MapCompare());
  76
  77     DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
  78             event->pc(), event->descr());
  79
  80     return true;
  81 }
  82
  83 bool
  84 PCEventQueue::doService(ExecContext *xc)
  85 {
  86     Addr pc = xc->readPC() & ~0x3;
  87     int serviced = 0;
  88     range_t range = equal_range(pc);
  89     for (iterator i = range.first; i != range.second; ++i) {
  90         // Make sure that the pc wasn't changed as the side effect of
  91         // another event.  This for example, prevents two invocations
  92         // of the SkipFuncEvent.  Maybe we should have separate PC
  93         // event queues for each processor?
  94         if (pc != (xc->readPC() & ~0x3))
  95             continue;
  96
  97         DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
  98                 (*i)->pc(), (*i)->descr());
  99
 100         (*i)->process(xc);
 101         ++serviced;
 102     }
 103
 104     return serviced > 0;
 105 }
 106
 107 void
 108 PCEventQueue::dump() const
 109 {
 110     const_iterator i = pc_map.begin();
 111     const_iterator e = pc_map.end();
 112
 113     for (; i != e; ++i)
 114         cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
 115                 (*i)->descr());
 116 }
 117
 118 PCEventQueue::range_t
 119 PCEventQueue::equal_range(Addr pc)
 120 {
 121     return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
 122 }
 123
 124 BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
 125                            bool del)
 126     : PCEvent(q, desc, addr), remove(del)
 127 {
 128 }
 129
 130 void
 131 BreakPCEvent::process(ExecContext *xc)
 132 {
 133     StringWrap name(xc->getCpuPtr()->name() + ".break_event");
 134     DPRINTFN("break event %s triggered\n", descr());
 135     debug_break();
 136     if (remove)
 137         delete this;
 138 }
 139
 140 #if FULL_SYSTEM
 141 extern "C"
 142 void
 143 sched_break_pc_sys(System *sys, Addr addr)
 144 {
 145     new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
 146 }
 147
 148 extern "C"
 149 void
 150 sched_break_pc(Addr addr)
 151 {
 152      for (vector<System *>::iterator sysi = System::systemList.begin();
 153           sysi != System::systemList.end(); ++sysi) {
 154          sched_break_pc_sys(*sysi, addr);
 155     }
 156
 157 }
 158 #endif