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