pc_event.cc revision 2 
1/*
2 * Copyright (c) 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 "debug.hh"
35#include "exec_context.hh"
36#include "pc_event.hh"
37#include "trace.hh"
38#include "universe.hh"
39
40#ifdef FULL_SYSTEM
41#include "arguments.hh"
42#include "pmap.h"
43#include "kernel.hh"
44#include "memory_control.hh"
45#include "cpu.hh"
46#include "system.hh"
47#include "bpred.hh"
48#endif
49
50using namespace std;
51
52PCEventQueue::PCEventQueue()
53{}
54
55PCEventQueue::~PCEventQueue()
56{}
57
58bool
59PCEventQueue::remove(PCEvent *event)
60{
61    int removed = 0;
62    range_t range = equal_range(event);
63    for (iterator i = range.first; i != range.second; ++i) {
64        if (*i == event) {
65            DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
66                    event->pc(), event->descr());
67            pc_map.erase(i);
68            ++removed;
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::service(ExecContext *xc)
89{
90    Addr pc = xc->regs.pc;
91    int serviced = 0;
92    range_t range = equal_range(pc);
93    for (iterator i = range.first; i != range.second; ++i) {
94        // Make sure that the pc wasn't changed as the side effect of
95        // another event.  This for example, prevents two invocations
96        // of the SkipFuncEvent.  Maybe we should have separate PC
97        // event queues for each processor?
98        if (pc != xc->regs.pc)
99            continue;
100
101        DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
102                (*i)->pc(), (*i)->descr());
103
104        (*i)->process(xc);
105        ++serviced;
106    }
107
108    return serviced > 0;
109}
110
111void
112PCEventQueue::dump() const
113{
114    const_iterator i = pc_map.begin();
115    const_iterator e = pc_map.end();
116
117    for (; i != e; ++i)
118        cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
119                (*i)->descr());
120}
121
122PCEventQueue::range_t
123PCEventQueue::equal_range(Addr pc)
124{
125    return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
126}
127
128#ifdef FULL_SYSTEM
129void
130SkipFuncEvent::process(ExecContext *xc)
131{
132    Addr newpc = xc->regs.intRegFile[ReturnAddressReg];
133
134    DPRINTF(PCEvent, "skipping %s: pc=%x, newpc=%x\n", description,
135            xc->regs.pc, newpc);
136
137    xc->regs.pc = newpc;
138    xc->regs.npc = xc->regs.pc + sizeof(MachInst);
139
140    BranchPred *bp = xc->cpu->getBranchPred();
141    if (bp != NULL) {
142        bp->popRAS(xc->thread_num);
143    }
144}
145
146void
147BadAddrEvent::process(ExecContext *xc)
148{
149    // The following gross hack is the equivalent function to the
150    // annotation for vmunix::badaddr in:
151    // simos/simulation/apps/tcl/osf/tlaser.tcl
152
153    uint64_t a0 = xc->regs.intRegFile[ArgumentReg0];
154
155    if (a0 < ALPHA_K0SEG_BASE || a0 >= ALPHA_K1SEG_BASE ||
156        xc->memCtrl->badaddr(ALPHA_K0SEG_TO_PHYS(a0) & PA_IMPL_MASK)) {
157
158        DPRINTF(BADADDR, "badaddr arg=%#x bad\n", a0);
159        xc->regs.intRegFile[ReturnValueReg] = 0x1;
160        SkipFuncEvent::process(xc);
161    }
162    else
163        DPRINTF(BADADDR, "badaddr arg=%#x good\n", a0);
164}
165
166void
167PrintfEvent::process(ExecContext *xc)
168{
169    if (DTRACE(Printf)) {
170        DebugOut() << curTick << ": " << xc->cpu->name() << ": ";
171
172        AlphaArguments args(xc);
173        Kernel::Printf(args);
174    }
175}
176
177void
178DebugPrintfEvent::process(ExecContext *xc)
179{
180    if (DTRACE(DebugPrintf)) {
181        if (!raw)
182            DebugOut() << curTick << ": " << xc->cpu->name() << ": ";
183
184        AlphaArguments args(xc);
185        Kernel::Printf(args);
186    }
187}
188
189void
190DumpMbufEvent::process(ExecContext *xc)
191{
192    if (DTRACE(DebugPrintf)) {
193        AlphaArguments args(xc);
194        Kernel::DumpMbuf(args);
195    }
196}
197#endif
198
199BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, bool del)
200    : PCEvent(q, desc), remove(del)
201{
202}
203
204void
205BreakPCEvent::process(ExecContext *xc)
206{
207    debug_break();
208    if (remove)
209        delete this;
210}
211
212#ifdef FULL_SYSTEM
213extern "C"
214void
215sched_break_pc_sys(System *sys, Addr addr)
216{
217    PCEvent *event = new BreakPCEvent(&sys->pcEventQueue, "debug break", true);
218    event->schedule(addr);
219}
220
221extern "C"
222void
223sched_break_pc(Addr addr)
224{
225     for (vector<System *>::iterator sysi = System::systemList.begin();
226          sysi != System::systemList.end(); ++sysi) {
227         sched_break_pc_sys(*sysi, addr);
228    }
229
230}
231#endif
232