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+/*
+ * 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);
+}
+