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Diffstat (limited to 'src/sim/init_signals.cc')
| -rw-r--r-- | src/sim/init_signals.cc | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/sim/init_signals.cc b/src/sim/init_signals.cc new file mode 100644 index 000000000..705a154e8 --- /dev/null +++ b/src/sim/init_signals.cc @@ -0,0 +1,138 @@ +/* + * Copyright (c) 2012 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Copyright (c) 2000-2005 The Regents of The University of Michigan + * Copyright (c) 2008 The Hewlett-Packard Development Company + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Nathan Binkert + */ + +#include <csignal> +#include <iostream> +#include <string> + +#include "base/cprintf.hh" +#include "sim/async.hh" +#include "sim/core.hh" +#include "sim/init_signals.hh" + +using namespace std; + +/// Stats signal handler. +void +dumpStatsHandler(int sigtype) +{ + async_event = true; + async_statdump = true; +} + +void +dumprstStatsHandler(int sigtype) +{ + async_event = true; + async_statdump = true; + async_statreset = true; +} + +/// Exit signal handler. +void +exitNowHandler(int sigtype) +{ + async_event = true; + async_exit = true; +} + +/// Abort signal handler. +void +abortHandler(int sigtype) +{ + ccprintf(cerr, "Program aborted at cycle %d\n", curTick()); +} + +// Handle SIGIO +static void +ioHandler(int sigtype) +{ + async_event = true; + async_io = true; +} + +static void +installSignalHandler(int signal, void (*handler)(int sigtype)) +{ + struct sigaction sa; + + memset(&sa, 0, sizeof(sa)); + sigemptyset(&sa.sa_mask); + sa.sa_handler = handler; + sa.sa_flags = SA_RESTART; + + if (sigaction(signal, &sa, NULL) == -1) + panic("Failed to setup handler for signal %i\n", signal); +} + +/* + * M5 can do several special things when various signals are sent. + * None are mandatory. + */ +void +initSignals() +{ + // Floating point exceptions may happen on misspeculated paths, so + // ignore them + signal(SIGFPE, SIG_IGN); + + // We use SIGTRAP sometimes for debugging + signal(SIGTRAP, SIG_IGN); + + // Dump intermediate stats + installSignalHandler(SIGUSR1, dumpStatsHandler); + + // Dump intermediate stats and reset them + installSignalHandler(SIGUSR2, dumprstStatsHandler); + + // Exit cleanly on Interrupt (Ctrl-C) + installSignalHandler(SIGINT, exitNowHandler); + + // Print out cycle number on abort + installSignalHandler(SIGABRT, abortHandler); + + // Install a SIGIO handler to handle asynchronous file IO. See the + // PollQueue class. + installSignalHandler(SIGIO, ioHandler); +} + |