cpu/pc_event.cc

   1 /*
   2  * Copyright (c) 2002-2003 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 "base/trace.hh"
  35 #include "cpu/base.hh"
  36 #include "cpu/exec_context.hh"
  37 #include "cpu/pc_event.hh"
  38 #include "sim/debug.hh"
  39 #include "sim/root.hh"
  40
  41 using namespace std;
  42
  43 PCEventQueue::PCEventQueue()
  44 {}
  45
  46 PCEventQueue::~PCEventQueue()
  47 {}
  48
  49 bool
  50 PCEventQueue::remove(PCEvent *event)
  51 {
  52     int removed = 0;
  53     range_t range = equal_range(event);
  54     for (iterator i = range.first; i != range.second; ++i) {
  55         if (*i == event) {
  56             DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
  57                     event->pc(), event->descr());
  58             pc_map.erase(i);
  59             ++removed;
  60         }
  61     }
  62
  63     return removed > 0;
  64 }
  65
  66 bool
  67 PCEventQueue::schedule(PCEvent *event)
  68 {
  69     pc_map.push_back(event);
  70     sort(pc_map.begin(), pc_map.end(), MapCompare());
  71
  72     DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
  73             event->pc(), event->descr());
  74
  75     return true;
  76 }
  77
  78 bool
  79 PCEventQueue::doService(ExecContext *xc)
  80 {
  81     Addr pc = xc->regs.pc & ~0x3;
  82     int serviced = 0;
  83     range_t range = equal_range(pc);
  84     for (iterator i = range.first; i != range.second; ++i) {
  85         // Make sure that the pc wasn't changed as the side effect of
  86         // another event.  This for example, prevents two invocations
  87         // of the SkipFuncEvent.  Maybe we should have separate PC
  88         // event queues for each processor?
  89         if (pc != (xc->regs.pc & ~0x3))
  90             continue;
  91
  92         DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
  93                 (*i)->pc(), (*i)->descr());
  94
  95         (*i)->process(xc);
  96         ++serviced;
  97     }
  98
  99     return serviced > 0;
 100 }
 101
 102 void
 103 PCEventQueue::dump() const
 104 {
 105     const_iterator i = pc_map.begin();
 106     const_iterator e = pc_map.end();
 107
 108     for (; i != e; ++i)
 109         cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
 110                 (*i)->descr());
 111 }
 112
 113 PCEventQueue::range_t
 114 PCEventQueue::equal_range(Addr pc)
 115 {
 116     return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
 117 }
 118
 119 BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, bool del)
 120     : PCEvent(q, desc), remove(del)
 121 {
 122 }
 123
 124 void
 125 BreakPCEvent::process(ExecContext *xc)
 126 {
 127     StringWrap name(xc->cpu->name() + ".break_event");
 128     DPRINTFN("break event %s triggered\n", descr());
 129     debug_break();
 130     if (remove)
 131         delete this;
 132 }
 133
 134 #ifdef FULL_SYSTEM
 135 extern "C"
 136 void
 137 sched_break_pc_sys(System *sys, Addr addr)
 138 {
 139     PCEvent *event = new BreakPCEvent(&sys->pcEventQueue, "debug break", true);
 140     event->schedule(addr);
 141 }
 142
 143 extern "C"
 144 void
 145 sched_break_pc(Addr addr)
 146 {
 147      for (vector<System *>::iterator sysi = System::systemList.begin();
 148           sysi != System::systemList.end(); ++sysi) {
 149          sched_break_pc_sys(*sysi, addr);
 150     }
 151
 152 }
 153 #endif