util/m5/src/command/readfile.cc

   1 /*
   2  * Copyright (c) 2003-2005 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
  29 #include <cstring>
  30 #include <iostream>
  31
  32 #include "args.hh"
  33 #include "command.hh"
  34 #include "dispatch_table.hh"
  35
  36 namespace
  37 {
  38
  39 int
  40 read_file(const DispatchTable &dt, std::ostream &os)
  41 {
  42     char buf[256 * 1024];
  43
  44     // Touch all buffer pages to ensure they are mapped in the
  45     // page table. This is required in the case of X86_FS, where
  46     // Linux does demand paging.
  47     memset(buf, 0, sizeof(buf));
  48
  49     int len;
  50     int offset = 0;
  51     while ((len = (*dt.m5_read_file)(buf, sizeof(buf), offset)) > 0) {
  52         os.write(buf, len);
  53         os.flush();
  54         if (!os) {
  55             std::cerr << "Failed to write file" << std::endl;
  56             exit(2);
  57         }
  58         offset += len;
  59     }
  60
  61     return offset;
  62 }
  63
  64 bool
  65 do_read_file(const DispatchTable &dt, Args &args)
  66 {
  67     if (args.size() > 0)
  68         return false;
  69
  70     read_file(dt, std::cout);
  71
  72     return true;
  73 }
  74
  75 Command read_file_cmd = {
  76     "readfile", 0, 0, do_read_file, "\n"
  77         "        read a preselected file from the host and write it to "
  78             "stdout" };
  79
  80 } // anonymous namespace