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