init_signals.cc revision 10453:d0365cc3d05f
1/* 2 * Copyright (c) 2012 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2000-2005 The Regents of The University of Michigan 15 * Copyright (c) 2008 The Hewlett-Packard Development Company 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Nathan Binkert 42 */ 43 44#include <csignal> 45#include <iostream> 46#include <string> 47 48#include "base/cprintf.hh" 49#include "sim/async.hh" 50#include "sim/core.hh" 51#include "sim/init_signals.hh" 52 53using namespace std; 54 55/// Stats signal handler. 56void 57dumpStatsHandler(int sigtype) 58{ 59 async_event = true; 60 async_statdump = true; 61} 62 63void 64dumprstStatsHandler(int sigtype) 65{ 66 async_event = true; 67 async_statdump = true; 68 async_statreset = true; 69} 70 71/// Exit signal handler. 72void 73exitNowHandler(int sigtype) 74{ 75 async_event = true; 76 async_exit = true; 77} 78 79/// Abort signal handler. 80void 81abortHandler(int sigtype) 82{ 83 ccprintf(cerr, "Program aborted at cycle %d\n", curTick()); 84} 85 86// Handle SIGIO 87static void 88ioHandler(int sigtype) 89{ 90 async_event = true; 91 async_io = true; 92} 93 94static void 95installSignalHandler(int signal, void (*handler)(int sigtype)) 96{ 97 struct sigaction sa; 98 99 memset(&sa, 0, sizeof(sa)); 100 sigemptyset(&sa.sa_mask); 101 sa.sa_handler = handler; 102 sa.sa_flags = SA_RESTART; 103 104 if (sigaction(signal, &sa, NULL) == -1) 105 panic("Failed to setup handler for signal %i\n", signal); 106} 107 108/* 109 * M5 can do several special things when various signals are sent. 110 * None are mandatory. 111 */ 112void 113initSignals() 114{ 115 // Floating point exceptions may happen on misspeculated paths, so 116 // ignore them 117 signal(SIGFPE, SIG_IGN); 118 119 // We use SIGTRAP sometimes for debugging 120 signal(SIGTRAP, SIG_IGN); 121 122 // Dump intermediate stats 123 installSignalHandler(SIGUSR1, dumpStatsHandler); 124 125 // Dump intermediate stats and reset them 126 installSignalHandler(SIGUSR2, dumprstStatsHandler); 127 128 // Exit cleanly on Interrupt (Ctrl-C) 129 installSignalHandler(SIGINT, exitNowHandler); 130 131 // Print out cycle number on abort 132 installSignalHandler(SIGABRT, abortHandler); 133 134 // Install a SIGIO handler to handle asynchronous file IO. See the 135 // PollQueue class. 136 installSignalHandler(SIGIO, ioHandler); 137} 138 139