pc_event.cc revision 9649 
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 <string>
34#include <utility>
35
36#include "base/debug.hh"
37#include "base/trace.hh"
38#include "cpu/base.hh"
39#include "cpu/pc_event.hh"
40#include "cpu/thread_context.hh"
41#include "debug/PCEvent.hh"
42#include "sim/core.hh"
43#include "sim/system.hh"
44
45using namespace std;
46
47PCEventQueue::PCEventQueue()
48{}
49
50PCEventQueue::~PCEventQueue()
51{}
52
53bool
54PCEventQueue::remove(PCEvent *event)
55{
56    int removed = 0;
57    range_t range = equal_range(event);
58    iterator i = range.first;
59    while (i != range.second &&
60           i != pc_map.end()) {
61        if (*i == event) {
62            DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
63                    event->pc(), event->descr());
64            i = pc_map.erase(i);
65            ++removed;
66        } else {
67            i++;
68        }
69
70    }
71
72    return removed > 0;
73}
74
75bool
76PCEventQueue::schedule(PCEvent *event)
77{
78    pc_map.push_back(event);
79    sort(pc_map.begin(), pc_map.end(), MapCompare());
80
81    DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
82            event->pc(), event->descr());
83
84    return true;
85}
86
87bool
88PCEventQueue::doService(ThreadContext *tc)
89{
90    // This will fail to break on Alpha PALcode addresses, but that is
91    // a rare use case.
92    Addr pc = tc->instAddr();
93    int serviced = 0;
94    range_t range = equal_range(pc);
95    for (iterator i = range.first; i != range.second; ++i) {
96        // Make sure that the pc wasn't changed as the side effect of
97        // another event.  This for example, prevents two invocations
98        // of the SkipFuncEvent.  Maybe we should have separate PC
99        // event queues for each processor?
100        if (pc != tc->instAddr())
101            continue;
102
103        DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
104                (*i)->pc(), (*i)->descr());
105
106        (*i)->process(tc);
107        ++serviced;
108    }
109
110    return serviced > 0;
111}
112
113void
114PCEventQueue::dump() const
115{
116    const_iterator i = pc_map.begin();
117    const_iterator e = pc_map.end();
118
119    for (; i != e; ++i)
120        cprintf("%d: event at %#x: %s\n", curTick(), (*i)->pc(),
121                (*i)->descr());
122}
123
124PCEventQueue::range_t
125PCEventQueue::equal_range(Addr pc)
126{
127    return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
128}
129
130BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
131                           bool del)
132    : PCEvent(q, desc, addr), remove(del)
133{
134}
135
136void
137BreakPCEvent::process(ThreadContext *tc)
138{
139    StringWrap name(tc->getCpuPtr()->name() + ".break_event");
140    DPRINTFN("break event %s triggered\n", descr());
141    Debug::breakpoint();
142    if (remove)
143        delete this;
144}
145
146void
147sched_break_pc_sys(System *sys, Addr addr)
148{
149    new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
150}
151
152void
153sched_break_pc(Addr addr)
154{
155     for (vector<System *>::iterator sysi = System::systemList.begin();
156          sysi != System::systemList.end(); ++sysi) {
157         sched_break_pc_sys(*sysi, addr);
158    }
159
160}
161
162PanicPCEvent::PanicPCEvent(PCEventQueue *q, const std::string &desc, Addr pc)
163    : PCEvent(q, desc, pc)
164{
165}
166
167void
168PanicPCEvent::process(ThreadContext *tc)
169{
170    StringWrap name(tc->getCpuPtr()->name() + ".panic_event");
171    panic(descr());
172}
173