pc_event.cc revision 2130 
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
42using namespace std;
43
44PCEventQueue::PCEventQueue()
45{}
46
47PCEventQueue::~PCEventQueue()
48{}
49
50bool
51PCEventQueue::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
67bool
68PCEventQueue::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
79bool
80PCEventQueue::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
103void
104PCEventQueue::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
114PCEventQueue::range_t
115PCEventQueue::equal_range(Addr pc)
116{
117    return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
118}
119
120BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
121                           bool del)
122    : PCEvent(q, desc, addr), remove(del)
123{
124}
125
126void
127BreakPCEvent::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
137extern "C"
138void
139sched_break_pc_sys(System *sys, Addr addr)
140{
141    new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
142}
143
144extern "C"
145void
146sched_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
155