base.cc revision 1400 
1/*
2 * Copyright (c) 2002-2004 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 <iostream>
30#include <string>
31#include <sstream>
32
33#include "base/cprintf.hh"
34#include "base/loader/symtab.hh"
35#include "base/misc.hh"
36#include "base/output.hh"
37#include "cpu/base_cpu.hh"
38#include "cpu/exec_context.hh"
39#include "sim/param.hh"
40#include "sim/sim_events.hh"
41
42using namespace std;
43
44vector<BaseCPU *> BaseCPU::cpuList;
45
46// This variable reflects the max number of threads in any CPU.  Be
47// careful to only use it once all the CPUs that you care about have
48// been initialized
49int maxThreadsPerCPU = 1;
50
51#ifdef FULL_SYSTEM
52BaseCPU::BaseCPU(Params *p)
53    : SimObject(p->name), frequency(p->freq), checkInterrupts(true),
54      params(p), number_of_threads(p->numberOfThreads), system(p->system)
55#else
56BaseCPU::BaseCPU(Params *p)
57    : SimObject(p->name), params(p), number_of_threads(p->numberOfThreads)
58#endif
59{
60    // add self to global list of CPUs
61    cpuList.push_back(this);
62
63    if (number_of_threads > maxThreadsPerCPU)
64        maxThreadsPerCPU = number_of_threads;
65
66    // allocate per-thread instruction-based event queues
67    comInstEventQueue = new EventQueue *[number_of_threads];
68    for (int i = 0; i < number_of_threads; ++i)
69        comInstEventQueue[i] = new EventQueue("instruction-based event queue");
70
71    //
72    // set up instruction-count-based termination events, if any
73    //
74    if (p->max_insts_any_thread != 0)
75        for (int i = 0; i < number_of_threads; ++i)
76            new SimExitEvent(comInstEventQueue[i], p->max_insts_any_thread,
77                "a thread reached the max instruction count");
78
79    if (p->max_insts_all_threads != 0) {
80        // allocate & initialize shared downcounter: each event will
81        // decrement this when triggered; simulation will terminate
82        // when counter reaches 0
83        int *counter = new int;
84        *counter = number_of_threads;
85        for (int i = 0; i < number_of_threads; ++i)
86            new CountedExitEvent(comInstEventQueue[i],
87                "all threads reached the max instruction count",
88                p->max_insts_all_threads, *counter);
89    }
90
91    // allocate per-thread load-based event queues
92    comLoadEventQueue = new EventQueue *[number_of_threads];
93    for (int i = 0; i < number_of_threads; ++i)
94        comLoadEventQueue[i] = new EventQueue("load-based event queue");
95
96    //
97    // set up instruction-count-based termination events, if any
98    //
99    if (p->max_loads_any_thread != 0)
100        for (int i = 0; i < number_of_threads; ++i)
101            new SimExitEvent(comLoadEventQueue[i], p->max_loads_any_thread,
102                "a thread reached the max load count");
103
104    if (p->max_loads_all_threads != 0) {
105        // allocate & initialize shared downcounter: each event will
106        // decrement this when triggered; simulation will terminate
107        // when counter reaches 0
108        int *counter = new int;
109        *counter = number_of_threads;
110        for (int i = 0; i < number_of_threads; ++i)
111            new CountedExitEvent(comLoadEventQueue[i],
112                "all threads reached the max load count",
113                p->max_loads_all_threads, *counter);
114    }
115
116#ifdef FULL_SYSTEM
117    memset(interrupts, 0, sizeof(interrupts));
118    intstatus = 0;
119#endif
120
121    functionTracingEnabled = false;
122    if (p->functionTrace) {
123        functionTraceStream = simout.find(csprintf("ftrace.%s", name()));
124        currentFunctionStart = currentFunctionEnd = 0;
125        functionEntryTick = p->functionTraceStart;
126
127        if (p->functionTraceStart == 0) {
128            functionTracingEnabled = true;
129        } else {
130            Event *e =
131                new EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace>(this,
132                                                                         true);
133            e->schedule(p->functionTraceStart);
134        }
135    }
136}
137
138
139void
140BaseCPU::enableFunctionTrace()
141{
142    functionTracingEnabled = true;
143}
144
145BaseCPU::~BaseCPU()
146{
147}
148
149void
150BaseCPU::init()
151{
152    if (!params->deferRegistration)
153        registerExecContexts();
154}
155
156void
157BaseCPU::regStats()
158{
159    using namespace Stats;
160
161    numCycles
162        .name(name() + ".numCycles")
163        .desc("number of cpu cycles simulated")
164        ;
165
166    int size = execContexts.size();
167    if (size > 1) {
168        for (int i = 0; i < size; ++i) {
169            stringstream namestr;
170            ccprintf(namestr, "%s.ctx%d", name(), i);
171            execContexts[i]->regStats(namestr.str());
172        }
173    } else if (size == 1)
174        execContexts[0]->regStats(name());
175}
176
177
178void
179BaseCPU::registerExecContexts()
180{
181    for (int i = 0; i < execContexts.size(); ++i) {
182        ExecContext *xc = execContexts[i];
183        int cpu_id;
184
185#ifdef FULL_SYSTEM
186        cpu_id = system->registerExecContext(xc);
187#else
188        cpu_id = xc->process->registerExecContext(xc);
189#endif
190
191        xc->cpu_id = cpu_id;
192    }
193}
194
195
196void
197BaseCPU::switchOut()
198{
199    // default: do nothing
200}
201
202void
203BaseCPU::takeOverFrom(BaseCPU *oldCPU)
204{
205    assert(execContexts.size() == oldCPU->execContexts.size());
206
207    for (int i = 0; i < execContexts.size(); ++i) {
208        ExecContext *newXC = execContexts[i];
209        ExecContext *oldXC = oldCPU->execContexts[i];
210
211        newXC->takeOverFrom(oldXC);
212        assert(newXC->cpu_id == oldXC->cpu_id);
213#ifdef FULL_SYSTEM
214        system->replaceExecContext(newXC, newXC->cpu_id);
215#else
216        assert(newXC->process == oldXC->process);
217        newXC->process->replaceExecContext(newXC, newXC->cpu_id);
218#endif
219    }
220
221#ifdef FULL_SYSTEM
222    for (int i = 0; i < NumInterruptLevels; ++i)
223        interrupts[i] = oldCPU->interrupts[i];
224    intstatus = oldCPU->intstatus;
225#endif
226}
227
228
229#ifdef FULL_SYSTEM
230void
231BaseCPU::post_interrupt(int int_num, int index)
232{
233    DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
234
235    if (int_num < 0 || int_num >= NumInterruptLevels)
236        panic("int_num out of bounds\n");
237
238    if (index < 0 || index >= sizeof(uint64_t) * 8)
239        panic("int_num out of bounds\n");
240
241    checkInterrupts = true;
242    interrupts[int_num] |= 1 << index;
243    intstatus |= (ULL(1) << int_num);
244}
245
246void
247BaseCPU::clear_interrupt(int int_num, int index)
248{
249    DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
250
251    if (int_num < 0 || int_num >= NumInterruptLevels)
252        panic("int_num out of bounds\n");
253
254    if (index < 0 || index >= sizeof(uint64_t) * 8)
255        panic("int_num out of bounds\n");
256
257    interrupts[int_num] &= ~(1 << index);
258    if (interrupts[int_num] == 0)
259        intstatus &= ~(ULL(1) << int_num);
260}
261
262void
263BaseCPU::clear_interrupts()
264{
265    DPRINTF(Interrupt, "Interrupts all cleared\n");
266
267    memset(interrupts, 0, sizeof(interrupts));
268    intstatus = 0;
269}
270
271
272void
273BaseCPU::serialize(std::ostream &os)
274{
275    SERIALIZE_ARRAY(interrupts, NumInterruptLevels);
276    SERIALIZE_SCALAR(intstatus);
277}
278
279void
280BaseCPU::unserialize(Checkpoint *cp, const std::string &section)
281{
282    UNSERIALIZE_ARRAY(interrupts, NumInterruptLevels);
283    UNSERIALIZE_SCALAR(intstatus);
284}
285
286#endif // FULL_SYSTEM
287
288void
289BaseCPU::traceFunctionsInternal(Addr pc)
290{
291    if (!debugSymbolTable)
292        return;
293
294    // if pc enters different function, print new function symbol and
295    // update saved range.  Otherwise do nothing.
296    if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
297        string sym_str;
298        bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
299                                                         currentFunctionStart,
300                                                         currentFunctionEnd);
301
302        if (!found) {
303            // no symbol found: use addr as label
304            sym_str = csprintf("0x%x", pc);
305            currentFunctionStart = pc;
306            currentFunctionEnd = pc + 1;
307        }
308
309        ccprintf(*functionTraceStream, " (%d)\n%d: %s",
310                 curTick - functionEntryTick, curTick, sym_str);
311        functionEntryTick = curTick;
312    }
313}
314
315
316DEFINE_SIM_OBJECT_CLASS_NAME("BaseCPU", BaseCPU)
317