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/*
* Copyright (c) 2009 The Regents of The University of Michigan
* 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: Ali Saidi
*/
#include "kern/linux/linux.hh"
#include <cstdio>
#include <string>
#include "cpu/base.hh"
#include "debug/SyscallVerbose.hh"
#include "sim/process.hh"
#include "sim/system.hh"
int
Linux::openSpecialFile(std::string path, Process *process,
ThreadContext *tc)
{
DPRINTFR(SyscallVerbose,
"%d: %s: generic-open: opening special file: %s\n",
curTick(), tc->getCpuPtr()->name(), path.c_str());
bool matched = false;
std::string data;
if (path.compare(0, 13, "/proc/meminfo") == 0) {
data = Linux::procMeminfo(process, tc);
matched = true;
} else if (path.compare(0, 11, "/etc/passwd") == 0) {
data = Linux::etcPasswd(process, tc);
matched = true;
} else if (path.compare(0, 30, "/sys/devices/system/cpu/online") == 0) {
data = Linux::cpuOnline(process, tc);
matched = true;
}
if (matched) {
FILE *f = tmpfile();
int fd = fileno(f);
size_t ret M5_VAR_USED = fwrite(data.c_str(), 1, data.size(), f);
assert(ret == data.size());
rewind(f);
return fd;
} else {
warn("Attempting to open special file: %s. Ignoring. Simulation may "
"take un-expected code path or be non-deterministic until proper "
"handling is implemented.\n", path.c_str());
errno = EACCES;
return -1;
}
}
std::string
Linux::procMeminfo(Process *process, ThreadContext *tc)
{
return csprintf("MemTotal:%12d kB\nMemFree: %12d kB\n",
process->system->memSize() >> 10,
process->system->freeMemSize() >> 10);
}
std::string
Linux::etcPasswd(Process *process, ThreadContext *tc)
{
return csprintf("gem5-user:x:1000:1000:gem5-user,,,:%s:/bin/bash\n",
process->getcwd());
}
std::string
Linux::cpuOnline(Process *process, ThreadContext *tc)
{
return csprintf("0-%d\n",
tc->getSystemPtr()->numContexts() - 1);
}
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