linux.cc revision 12591:48dfacae20ba
1/* 2 * Copyright (c) 2009 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 */ 30 31#include "kern/linux/linux.hh" 32 33#include <cstdio> 34#include <string> 35 36#include "cpu/base.hh" 37#include "debug/SyscallVerbose.hh" 38#include "sim/process.hh" 39#include "sim/system.hh" 40 41int 42Linux::openSpecialFile(std::string path, Process *process, 43 ThreadContext *tc) 44{ 45 DPRINTFR(SyscallVerbose, 46 "%d: %s: generic-open: opening special file: %s\n", 47 curTick(), tc->getCpuPtr()->name(), path.c_str()); 48 49 bool matched = false; 50 std::string data; 51 52 if (path.compare(0, 13, "/proc/meminfo") == 0) { 53 data = Linux::procMeminfo(process, tc); 54 matched = true; 55 } else if (path.compare(0, 11, "/etc/passwd") == 0) { 56 data = Linux::etcPasswd(process, tc); 57 matched = true; 58 } else if (path.compare(0, 30, "/sys/devices/system/cpu/online") == 0) { 59 data = Linux::cpuOnline(process, tc); 60 matched = true; 61 } 62 63 if (matched) { 64 FILE *f = tmpfile(); 65 int fd = fileno(f); 66 size_t ret M5_VAR_USED = fwrite(data.c_str(), 1, data.size(), f); 67 assert(ret == data.size()); 68 rewind(f); 69 return fd; 70 } else { 71 warn("Attempting to open special file: %s. Ignoring. Simulation may " 72 "take un-expected code path or be non-deterministic until proper " 73 "handling is implemented.\n", path.c_str()); 74 errno = EACCES; 75 return -1; 76 } 77} 78 79std::string 80Linux::procMeminfo(Process *process, ThreadContext *tc) 81{ 82 return csprintf("MemTotal:%12d kB\nMemFree: %12d kB\n", 83 process->system->memSize() >> 10, 84 process->system->freeMemSize() >> 10); 85} 86 87std::string 88Linux::etcPasswd(Process *process, ThreadContext *tc) 89{ 90 return csprintf("gem5-user:x:1000:1000:gem5-user,,,:%s:/bin/bash\n", 91 process->getcwd()); 92} 93 94std::string 95Linux::cpuOnline(Process *process, ThreadContext *tc) 96{ 97 return csprintf("0-%d\n", 98 tc->getSystemPtr()->numContexts() - 1); 99} 100