pc_event.cc revision 2680 
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/trace.hh"
38#include "config/full_system.hh"
39#include "cpu/base.hh"
40#include "cpu/thread_context.hh"
41#include "cpu/pc_event.hh"
42#include "sim/debug.hh"
43#include "sim/root.hh"
44#include "sim/system.hh"
45
46using namespace std;
47
48PCEventQueue::PCEventQueue()
49{}
50
51PCEventQueue::~PCEventQueue()
52{}
53
54bool
55PCEventQueue::remove(PCEvent *event)
56{
57    int removed = 0;
58    range_t range = equal_range(event);
59    for (iterator i = range.first; i != range.second; ++i) {
60        if (*i == event) {
61            DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
62                    event->pc(), event->descr());
63            pc_map.erase(i);
64            ++removed;
65        }
66    }
67
68    return removed > 0;
69}
70
71bool
72PCEventQueue::schedule(PCEvent *event)
73{
74    pc_map.push_back(event);
75    sort(pc_map.begin(), pc_map.end(), MapCompare());
76
77    DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
78            event->pc(), event->descr());
79
80    return true;
81}
82
83bool
84PCEventQueue::doService(ThreadContext *tc)
85{
86    Addr pc = tc->readPC() & ~0x3;
87    int serviced = 0;
88    range_t range = equal_range(pc);
89    for (iterator i = range.first; i != range.second; ++i) {
90        // Make sure that the pc wasn't changed as the side effect of
91        // another event.  This for example, prevents two invocations
92        // of the SkipFuncEvent.  Maybe we should have separate PC
93        // event queues for each processor?
94        if (pc != (tc->readPC() & ~0x3))
95            continue;
96
97        DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
98                (*i)->pc(), (*i)->descr());
99
100        (*i)->process(tc);
101        ++serviced;
102    }
103
104    return serviced > 0;
105}
106
107void
108PCEventQueue::dump() const
109{
110    const_iterator i = pc_map.begin();
111    const_iterator e = pc_map.end();
112
113    for (; i != e; ++i)
114        cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
115                (*i)->descr());
116}
117
118PCEventQueue::range_t
119PCEventQueue::equal_range(Addr pc)
120{
121    return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
122}
123
124BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
125                           bool del)
126    : PCEvent(q, desc, addr), remove(del)
127{
128}
129
130void
131BreakPCEvent::process(ThreadContext *tc)
132{
133    StringWrap name(tc->getCpuPtr()->name() + ".break_event");
134    DPRINTFN("break event %s triggered\n", descr());
135    debug_break();
136    if (remove)
137        delete this;
138}
139
140#if FULL_SYSTEM
141extern "C"
142void
143sched_break_pc_sys(System *sys, Addr addr)
144{
145    new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
146}
147
148extern "C"
149void
150sched_break_pc(Addr addr)
151{
152     for (vector<System *>::iterator sysi = System::systemList.begin();
153          sysi != System::systemList.end(); ++sysi) {
154         sched_break_pc_sys(*sysi, addr);
155    }
156
157}
158#endif
159