gem5/sim/syscall_emul.cc
Steve Reinhardt 4410876773 Actually free Process fd_map entries when a file is closed...
amazingly we never did that before.  Caused us to run out of
file descriptors in twolf.

sim/process.cc:
    Add free_fd() method to free closed target fd in simulator fd map.
    Rename open_fd() to alloc_fd() for symmetry with free_fd().
sim/process.hh:
    Add free_fd() method to free closed target fd in simulator fd map.
    Rename open_fd() to alloc_fd() for symmetry with free_fd().
    Crank up MAX_FD while we're at it.
sim/syscall_emul.cc:
    Call free_fd() on process when target closes a file.
sim/syscall_emul.hh:
    Process open_fd() renamed to alloc_fd().

--HG--
extra : convert_revision : d780f4ccfd5a0989230b0afbdbd276212b87550c
2005-11-10 21:08:33 -05:00

244 lines
6.4 KiB
C++

/*
* Copyright (c) 2003-2005 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.
*/
#include <unistd.h>
#include <string>
#include <iostream>
#include "sim/syscall_emul.hh"
#include "base/trace.hh"
#include "cpu/exec_context.hh"
#include "cpu/base.hh"
#include "sim/process.hh"
#include "sim/sim_events.hh"
using namespace std;
void
SyscallDesc::doSyscall(int callnum, Process *process, ExecContext *xc)
{
DPRINTFR(SyscallVerbose, "%s: syscall %s called\n",
xc->cpu->name(), name);
SyscallReturn retval = (*funcPtr)(this, callnum, process, xc);
DPRINTFR(SyscallVerbose, "%s: syscall %s returns %d\n",
xc->cpu->name(), name, retval.value());
if (!(flags & SyscallDesc::SuppressReturnValue))
xc->setSyscallReturn(retval);
}
SyscallReturn
unimplementedFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
fatal("syscall %s (#%d) unimplemented.", desc->name, callnum);
}
SyscallReturn
ignoreFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
warn("ignoring syscall %s(%d, %d, ...)", desc->name,
xc->getSyscallArg(0), xc->getSyscallArg(1));
return 0;
}
SyscallReturn
exitFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
new SimExitEvent("syscall caused exit", xc->getSyscallArg(0) & 0xff);
return 1;
}
SyscallReturn
getpagesizeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
return VMPageSize;
}
SyscallReturn
obreakFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
// change brk addr to first arg
Addr new_brk = xc->getSyscallArg(0);
if (new_brk != 0)
{
p->brk_point = xc->getSyscallArg(0);
}
DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point);
return p->brk_point;
}
SyscallReturn
closeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int target_fd = xc->getSyscallArg(0);
int status = close(p->sim_fd(target_fd));
if (status >= 0)
p->free_fd(target_fd);
return status;
}
SyscallReturn
readFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
int nbytes = xc->getSyscallArg(2);
BufferArg bufArg(xc->getSyscallArg(1), nbytes);
int bytes_read = read(fd, bufArg.bufferPtr(), nbytes);
if (bytes_read != -1)
bufArg.copyOut(xc->mem);
return bytes_read;
}
SyscallReturn
writeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
int nbytes = xc->getSyscallArg(2);
BufferArg bufArg(xc->getSyscallArg(1), nbytes);
bufArg.copyIn(xc->mem);
int bytes_written = write(fd, bufArg.bufferPtr(), nbytes);
fsync(fd);
return bytes_written;
}
SyscallReturn
lseekFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
uint64_t offs = xc->getSyscallArg(1);
int whence = xc->getSyscallArg(2);
off_t result = lseek(fd, offs, whence);
return (result == (off_t)-1) ? -errno : result;
}
SyscallReturn
munmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
// given that we don't really implement mmap, munmap is really easy
return 0;
}
const char *hostname = "m5.eecs.umich.edu";
SyscallReturn
gethostnameFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int name_len = xc->getSyscallArg(1);
BufferArg name(xc->getSyscallArg(0), name_len);
strncpy((char *)name.bufferPtr(), hostname, name_len);
name.copyOut(xc->mem);
return 0;
}
SyscallReturn
unlinkFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
return (TheISA::IntReg)-EFAULT;
int result = unlink(path.c_str());
return (result == -1) ? -errno : result;
}
SyscallReturn
renameFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
string old_name;
if (xc->mem->readString(old_name, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
string new_name;
if (xc->mem->readString(new_name, xc->getSyscallArg(1)) != No_Fault)
return -EFAULT;
int64_t result = rename(old_name.c_str(), new_name.c_str());
return (result == -1) ? -errno : result;
}
SyscallReturn
truncateFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
off_t length = xc->getSyscallArg(1);
int result = truncate(path.c_str(), length);
return (result == -1) ? -errno : result;
}
SyscallReturn
ftruncateFunc(SyscallDesc *desc, int num, Process *process, ExecContext *xc)
{
int fd = process->sim_fd(xc->getSyscallArg(0));
if (fd < 0)
return -EBADF;
off_t length = xc->getSyscallArg(1);
int result = ftruncate(fd, length);
return (result == -1) ? -errno : result;
}