pc_event.cc revision 2632:1bb2f91485ea 
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#include "sim/system.hh"
42
43using namespace std;
44
45PCEventQueue::PCEventQueue()
46{}
47
48PCEventQueue::~PCEventQueue()
49{}
50
51bool
52PCEventQueue::remove(PCEvent *event)
53{
54    int removed = 0;
55    range_t range = equal_range(event);
56    for (iterator i = range.first; i != range.second; ++i) {
57        if (*i == event) {
58            DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
59                    event->pc(), event->descr());
60            pc_map.erase(i);
61            ++removed;
62        }
63    }
64
65    return removed > 0;
66}
67
68bool
69PCEventQueue::schedule(PCEvent *event)
70{
71    pc_map.push_back(event);
72    sort(pc_map.begin(), pc_map.end(), MapCompare());
73
74    DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
75            event->pc(), event->descr());
76
77    return true;
78}
79
80bool
81PCEventQueue::doService(ExecContext *xc)
82{
83    Addr pc = xc->readPC() & ~0x3;
84    int serviced = 0;
85    range_t range = equal_range(pc);
86    for (iterator i = range.first; i != range.second; ++i) {
87        // Make sure that the pc wasn't changed as the side effect of
88        // another event.  This for example, prevents two invocations
89        // of the SkipFuncEvent.  Maybe we should have separate PC
90        // event queues for each processor?
91        if (pc != (xc->readPC() & ~0x3))
92            continue;
93
94        DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
95                (*i)->pc(), (*i)->descr());
96
97        (*i)->process(xc);
98        ++serviced;
99    }
100
101    return serviced > 0;
102}
103
104void
105PCEventQueue::dump() const
106{
107    const_iterator i = pc_map.begin();
108    const_iterator e = pc_map.end();
109
110    for (; i != e; ++i)
111        cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
112                (*i)->descr());
113}
114
115PCEventQueue::range_t
116PCEventQueue::equal_range(Addr pc)
117{
118    return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
119}
120
121BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
122                           bool del)
123    : PCEvent(q, desc, addr), remove(del)
124{
125}
126
127void
128BreakPCEvent::process(ExecContext *xc)
129{
130    StringWrap name(xc->getCpuPtr()->name() + ".break_event");
131    DPRINTFN("break event %s triggered\n", descr());
132    debug_break();
133    if (remove)
134        delete this;
135}
136
137#if FULL_SYSTEM
138extern "C"
139void
140sched_break_pc_sys(System *sys, Addr addr)
141{
142    new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
143}
144
145extern "C"
146void
147sched_break_pc(Addr addr)
148{
149     for (vector<System *>::iterator sysi = System::systemList.begin();
150          sysi != System::systemList.end(); ++sysi) {
151         sched_break_pc_sys(*sysi, addr);
152    }
153
154}
155#endif
156