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     // This will fail to break on Alpha PALcode addresses, but that is
  88     // a rare use case.
  89     Addr pc = tc->instAddr();
  90     int serviced = 0;
  91     range_t range = equal_range(pc);
  92     for (iterator i = range.first; i != range.second; ++i) {
  93         // Make sure that the pc wasn't changed as the side effect of
  94         // another event.  This for example, prevents two invocations
  95         // of the SkipFuncEvent.  Maybe we should have separate PC
  96         // event queues for each processor?
  97         if (pc != tc->instAddr())
  98             continue;
  99
 100         DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
 101                 (*i)->pc(), (*i)->descr());
 102
 103         (*i)->process(tc);
 104         ++serviced;
 105     }
 106
 107     return serviced > 0;
 108 }
 109
 110 void
 111 PCEventQueue::dump() const
 112 {
 113     const_iterator i = pc_map.begin();
 114     const_iterator e = pc_map.end();
 115
 116     for (; i != e; ++i)
 117         cprintf("%d: event at %#x: %s\n", curTick(), (*i)->pc(),
 118                 (*i)->descr());
 119 }
 120
 121 PCEventQueue::range_t
 122 PCEventQueue::equal_range(Addr pc)
 123 {
 124     return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
 125 }
 126
 127 BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
 128                            bool del)
 129     : PCEvent(q, desc, addr), remove(del)
 130 {
 131 }
 132
 133 void
 134 BreakPCEvent::process(ThreadContext *tc)
 135 {
 136     StringWrap name(tc->getCpuPtr()->name() + ".break_event");
 137     DPRINTFN("break event %s triggered\n", descr());
 138     Debug::breakpoint();
 139     if (remove)
 140         delete this;
 141 }
 142
 143 #if FULL_SYSTEM
 144 void
 145 sched_break_pc_sys(System *sys, Addr addr)
 146 {
 147     new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
 148 }
 149
 150 void
 151 sched_break_pc(Addr addr)
 152 {
 153      for (vector<System *>::iterator sysi = System::systemList.begin();
 154           sysi != System::systemList.end(); ++sysi) {
 155          sched_break_pc_sys(*sysi, addr);
 156     }
 157
 158 }
 159 #endif