config: Add a --without-python option to build process

Add the ability to build libgem5 without embedded Python or the
ability to configure with Python.

This is a prelude to a patch to allow config.ini files to be loaded
into libgem5 using only C++ which would make embedding gem5 within
other simulation systems easier.

This adds a few registration interfaces to things which cross
between Python and C++.  Namely: stats dumping and SimObject resolving

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);
+}
+