452 lines
14 KiB
C++
452 lines
14 KiB
C++
/*
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* Copyright (c) 2003 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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///
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/// @file sim/main.cc
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///
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string>
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#include <vector>
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#include "base/copyright.hh"
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#include "base/inifile.hh"
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#include "base/misc.hh"
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#include "base/pollevent.hh"
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#include "base/statistics.hh"
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#include "base/time.hh"
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#include "cpu/base_cpu.hh"
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#include "cpu/full_cpu/smt.hh"
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#include "sim/async.hh"
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#include "sim/builder.hh"
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#include "sim/configfile.hh"
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#include "sim/host.hh"
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#include "sim/sim_events.hh"
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#include "sim/sim_exit.hh"
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#include "sim/sim_init.hh"
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#include "sim/sim_object.hh"
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#include "sim/stat_control.hh"
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#include "sim/stats.hh"
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#include "sim/universe.hh"
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using namespace std;
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// See async.h.
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volatile bool async_event = false;
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volatile bool async_dump = false;
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volatile bool async_dumpreset = false;
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volatile bool async_exit = false;
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volatile bool async_io = false;
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volatile bool async_alarm = false;
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/// Stats signal handler.
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void
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dumpStatsHandler(int sigtype)
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{
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async_event = true;
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async_dump = true;
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}
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void
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dumprstStatsHandler(int sigtype)
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{
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async_event = true;
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async_dumpreset = true;
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}
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/// Exit signal handler.
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void
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exitNowHandler(int sigtype)
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{
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async_event = true;
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async_exit = true;
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}
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/// Simulator executable name
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const char *myProgName = "";
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/// Show brief help message.
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static void
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showBriefHelp(ostream &out)
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{
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out << "Usage: " << myProgName
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<< " [-hn] [-Dname[=def]] [-Uname] [-I[dir]] "
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<< "[--<section>:<param>=<value>] [<config file> ...]" << endl
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<< " -h: print long help (including parameter listing)" << endl
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<< " -n: don't load default.ini" << endl
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<< " -u: don't quit on unreferenced parameters" << endl
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<< " -D,-U,-I: passed to cpp for preprocessing .ini files" << endl;
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}
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/// Show verbose help message. Includes parameter listing from
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/// showBriefHelp(), plus an exhaustive list of ini-file parameters
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/// and SimObjects (with their parameters).
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static void
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showLongHelp(ostream &out)
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{
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showBriefHelp(out);
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out << endl
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<< endl
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<< "-----------------" << endl
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<< "Global Parameters" << endl
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<< "-----------------" << endl
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<< endl;
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ParamContext::describeAllContexts(out);
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out << endl
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<< endl
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<< "-----------------" << endl
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<< "Simulator Objects" << endl
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<< "-----------------" << endl
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<< endl;
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SimObjectClass::describeAllClasses(out);
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}
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/// Print welcome message.
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static void
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sayHello(ostream &out)
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{
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extern const char *compileDate; // from date.cc
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ccprintf(out, "M5 Simulator System\n");
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// display copyright
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ccprintf(out, "%s\n", briefCopyright);
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ccprintf(out, "M5 compiled on %d\n", compileDate);
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char *host = getenv("HOSTNAME");
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if (!host)
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host = getenv("HOST");
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if (host)
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ccprintf(out, "M5 executing on %s\n", host);
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ccprintf(out, "M5 simulation started %s\n", Time::start);
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}
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///
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/// Echo the command line for posterity in such a way that it can be
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/// used to rerun the same simulation (given the same .ini files).
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///
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static void
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echoCommandLine(int argc, char **argv, ostream &out)
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{
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out << "command line: " << argv[0];
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for (int i = 1; i < argc; i++) {
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string arg(argv[i]);
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out << ' ';
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// If the arg contains spaces, we need to quote it.
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// The rest of this is overkill to make it look purty.
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// print dashes first outside quotes
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int non_dash_pos = arg.find_first_not_of("-");
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out << arg.substr(0, non_dash_pos); // print dashes
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string body = arg.substr(non_dash_pos); // the rest
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// if it's an assignment, handle the lhs & rhs separately
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int eq_pos = body.find("=");
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if (eq_pos == string::npos) {
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out << quote(body);
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}
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else {
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string lhs(body.substr(0, eq_pos));
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string rhs(body.substr(eq_pos + 1));
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out << quote(lhs) << "=" << quote(rhs);
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}
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}
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out << endl << endl;
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}
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///
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/// The simulator configuration database. This is the union of all
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/// specified .ini files. This shouldn't need to be visible outside
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/// this file, as it is passed as a parameter to all the param-parsing
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/// routines.
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///
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static IniFile simConfigDB;
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/// Check for a default.ini file and load it if necessary.
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static void
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handleDefaultIni(bool &loadIt, vector<char *> &cppArgs)
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{
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struct stat sb;
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if (loadIt) {
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if (stat("default.ini", &sb) == 0) {
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if (!simConfigDB.loadCPP("default.ini", cppArgs)) {
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cout << "Error processing file default.ini" << endl;
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exit(1);
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}
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}
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// set this whether it actually was found or not, so we don't
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// bother to check again next time
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loadIt = false;
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}
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}
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/// M5 entry point.
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int
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main(int argc, char **argv)
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{
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// Save off program name
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myProgName = argv[0];
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signal(SIGFPE, SIG_IGN); // may occur on misspeculated paths
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signal(SIGTRAP, SIG_IGN);
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signal(SIGUSR1, dumpStatsHandler); // dump intermediate stats
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signal(SIGUSR2, dumprstStatsHandler); // dump and reset stats
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signal(SIGINT, exitNowHandler); // dump final stats and exit
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sayHello(cerr);
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// Initialize statistics database
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Stats::InitSimStats();
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vector<char *> cppArgs;
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// Should we use default.ini if it exists? By default, yes. (Use
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// -n to override.)
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bool loadDefaultIni = true;
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// Should we quit if there are unreferenced parameters? By
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// default, yes... it's a good way of catching typos in
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// section/parameter names (which otherwise go by silently). Use
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// -u to override.
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bool quitOnUnreferenced = true;
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// Parse command-line options. The tricky part here is figuring
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// out whether to look for & load default.ini, and if needed,
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// doing so at the right time w.r.t. processing the other
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// parameters.
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//
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// Since most of the complex options are handled through the
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// config database, we don't mess with getopts, and just parse
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// manually.
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for (int i = 1; i < argc; ++i) {
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char *arg_str = argv[i];
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// if arg starts with '-', parse as option,
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// else treat it as a configuration file name and load it
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if (arg_str[0] == '-') {
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// switch on second char
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switch (arg_str[1]) {
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case 'h':
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// -h: show help
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showLongHelp(cerr);
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exit(1);
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case 'n':
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// -n: don't load default.ini
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if (!loadDefaultIni) {
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cerr << "Warning: -n option needs to precede any "
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<< "explicit configuration file name " << endl
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<< " or command-line configuration parameter."
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<< endl;
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}
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loadDefaultIni = false;
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break;
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case 'u':
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// -u: don't quit on unreferenced parameters
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quitOnUnreferenced = false;
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break;
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case 'D':
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case 'U':
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case 'I':
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// cpp options: record & pass to cpp. Note that these
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// cannot have spaces, i.e., '-Dname=val' is OK, but
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// '-D name=val' is not. I don't consider this a
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// problem, since even though gnu cpp accepts the
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// latter, other cpp implementations do not (Tru64,
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// for one).
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cppArgs.push_back(arg_str);
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break;
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case '-':
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// command-line configuration parameter:
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// '--<section>:<parameter>=<value>'
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// Load default.ini if necessary -- see comment in
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// else clause below.
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handleDefaultIni(loadDefaultIni, cppArgs);
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if (!simConfigDB.add(arg_str + 2)) {
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// parse error
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ccprintf(cerr,
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"Could not parse configuration argument '%s'\n"
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"Expecting --<section>:<parameter>=<value>\n",
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arg_str);
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exit(0);
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}
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break;
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default:
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showBriefHelp(cerr);
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ccprintf(cerr, "Fatal: invalid argument '%s'\n", arg_str);
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exit(0);
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}
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}
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else {
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// no '-', treat as config file name
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// If we haven't loaded default.ini yet, and we want to,
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// now is the time. Can't do it sooner because we need to
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// look for '-n', can't do it later since we want
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// default.ini loaded first (so that any other settings
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// override it).
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handleDefaultIni(loadDefaultIni, cppArgs);
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if (!simConfigDB.loadCPP(arg_str, cppArgs)) {
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cprintf("Error processing file %s\n", arg_str);
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exit(1);
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}
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}
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}
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// Final check for default.ini, in case no config files or
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// command-line config parameters were given.
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handleDefaultIni(loadDefaultIni, cppArgs);
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// The configuration database is now complete; start processing it.
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// Parse and check all non-config-hierarchy parameters.
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ParamContext::parseAllContexts(simConfigDB);
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ParamContext::checkAllContexts();
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// Print header info into stats file. Can't do this sooner since
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// the stat file name is set via a .ini param... thus it just got
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// opened above during ParamContext::checkAllContexts().
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// Print hello message to stats file if it's actually a file. If
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// it's not (i.e. it's cout or cerr) then we already did it above.
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if (outputStream != &cout && outputStream != &cerr)
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sayHello(*outputStream);
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// Echo command line and all parameter settings to stats file as well.
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echoCommandLine(argc, argv, *outputStream);
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ParamContext::showAllContexts(builderStream());
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// Now process the configuration hierarchy and create the SimObjects.
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ConfigHierarchy configHierarchy(simConfigDB);
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configHierarchy.build();
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configHierarchy.createSimObjects();
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// Restore checkpointed state, if any.
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configHierarchy.unserializeSimObjects();
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// Done processing the configuration database.
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// Check for unreferenced entries.
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if (simConfigDB.printUnreferenced() && quitOnUnreferenced) {
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cerr << "Fatal: unreferenced .ini sections/entries." << endl
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<< "If this is not an error, add 'unref_section_ok=y' or "
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<< "'unref_entries_ok=y' to the appropriate sections "
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<< "to suppress this message." << endl;
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exit(1);
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}
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SimObject::regAllStats();
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// uncomment the following to get PC-based execution-time profile
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#ifdef DO_PROFILE
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init_profile((char *)&_init, (char *)&_fini);
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#endif
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// Check to make sure that the stats package is properly initialized
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Stats::check();
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// Reset to put the stats in a consistent state.
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Stats::reset();
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// Nothing to simulate if we don't have at least one CPU somewhere.
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if (BaseCPU::numSimulatedCPUs() == 0) {
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cerr << "Fatal: no CPUs to simulate." << endl;
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exit(1);
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}
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SimInit();
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warn("Entering event queue. Starting simulation...\n");
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while (!mainEventQueue.empty()) {
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assert(curTick <= mainEventQueue.nextTick() &&
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"event scheduled in the past");
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// forward current cycle to the time of the first event on the
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// queue
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curTick = mainEventQueue.nextTick();
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mainEventQueue.serviceOne();
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if (async_event) {
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async_event = false;
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if (async_dump) {
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async_dump = false;
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using namespace Stats;
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SetupEvent(Dump, curTick);
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}
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if (async_dumpreset) {
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async_dumpreset = false;
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using namespace Stats;
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SetupEvent(Dump | Reset, curTick);
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}
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if (async_exit) {
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async_exit = false;
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new SimExitEvent("User requested STOP");
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}
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if (async_io || async_alarm) {
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async_io = false;
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async_alarm = false;
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pollQueue.service();
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}
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}
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}
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// This should never happen... every conceivable way for the
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// simulation to terminate (hit max cycles/insts, signal,
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// simulated system halts/exits) generates an exit event, so we
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// should never run out of events on the queue.
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exitNow("no events on event loop! All CPUs must be idle.", 1);
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return 0;
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}
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