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