linux.cc revision 8232:b28d06a175be 
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 <cstdio>
32#include <string>
33
34#include "cpu/thread_context.hh"
35#include "debug/SyscallVerbose.hh"
36#include "kern/linux/linux.hh"
37#include "sim/process.hh"
38#include "sim/system.hh"
39
40int
41Linux::openSpecialFile(std::string path, LiveProcess *process, ThreadContext *tc)
42{
43    DPRINTF(SyscallVerbose, "Opening special file: %s\n", path.c_str());
44    if (path.compare(0, 13, "/proc/meminfo") == 0) {
45        std::string data = Linux::procMeminfo(process, tc);
46        FILE *f = tmpfile();
47        int fd = fileno(f);
48        size_t ret M5_VAR_USED = fwrite(data.c_str(), 1, data.size(), f);
49        assert(ret == data.size());
50        rewind(f);
51        return fd;
52    }
53
54    warn("Attempting to open special file: %s. Ignorning. Simulation may"
55            " take un-expected code path or be non-deterministic until proper"
56            "  handling is implemented.\n", path.c_str());
57    return -1;
58}
59
60std::string
61Linux::procMeminfo(LiveProcess *process, ThreadContext *tc)
62{
63    return csprintf("MemTotal:%12d kB\nMemFree: %12d kB\n",
64            process->system->memSize() >> 10,
65            process->system->freeMemSize() >> 10);
66}
67
68