syscall_emul.hh

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· HH 代码 · 共 1,024 行 · 第 1/2 页

    // Adjust path for current working directory
    path = process->fullPath(path);

    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());

    // open the file
    int fd = open(path.c_str(), hostFlags, mode);

    return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
}


/// Target chmod() handler.
template <class OS>
SyscallReturn
chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
          ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
        return -EFAULT;

    uint32_t mode = tc->getSyscallArg(1);
    mode_t hostMode = 0;

    // XXX translate mode flags via OS::something???
    hostMode = mode;

    // Adjust path for current working directory
    path = process->fullPath(path);

    // do the chmod
    int result = chmod(path.c_str(), hostMode);
    if (result < 0)
        return -errno;

    return 0;
}


/// Target fchmod() handler.
template <class OS>
SyscallReturn
fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
           ThreadContext *tc)
{
    int fd = tc->getSyscallArg(0);
    if (fd < 0 || process->sim_fd(fd) < 0) {
        // doesn't map to any simulator fd: not a valid target fd
        return -EBADF;
    }

    uint32_t mode = tc->getSyscallArg(1);
    mode_t hostMode = 0;

    // XXX translate mode flags via OS::someting???
    hostMode = mode;

    // do the fchmod
    int result = fchmod(process->sim_fd(fd), hostMode);
    if (result < 0)
        return -errno;

    return 0;
}


/// Target stat() handler.
template <class OS>
SyscallReturn
statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
         ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
    return -EFAULT;

    // Adjust path for current working directory
    path = process->fullPath(path);

    struct stat hostBuf;
    int result = stat(path.c_str(), &hostBuf);

    if (result < 0)
        return -errno;

    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);

    return 0;
}


/// Target stat64() handler.
template <class OS>
SyscallReturn
stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
           ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
        return -EFAULT;

    // Adjust path for current working directory
    path = process->fullPath(path);

#if NO_STAT64
    struct stat  hostBuf;
    int result = stat(path.c_str(), &hostBuf);
#else
    struct stat64 hostBuf;
    int result = stat64(path.c_str(), &hostBuf);
#endif

    if (result < 0)
        return -errno;

    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);

    return 0;
}


/// Target fstat64() handler.
template <class OS>
SyscallReturn
fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
            ThreadContext *tc)
{
    int fd = tc->getSyscallArg(0);
    if (fd < 0 || process->sim_fd(fd) < 0) {
        // doesn't map to any simulator fd: not a valid target fd
        return -EBADF;
    }

#if NO_STAT64
    struct stat  hostBuf;
    int result = fstat(process->sim_fd(fd), &hostBuf);
#else
    struct stat64  hostBuf;
    int result = fstat64(process->sim_fd(fd), &hostBuf);
#endif

    if (result < 0)
        return -errno;

    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
        &hostBuf, (fd == 1));

    return 0;
}


/// Target lstat() handler.
template <class OS>
SyscallReturn
lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
          ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
      return -EFAULT;

    // Adjust path for current working directory
    path = process->fullPath(path);

    struct stat hostBuf;
    int result = lstat(path.c_str(), &hostBuf);

    if (result < 0)
        return -errno;

    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);

    return 0;
}

/// Target lstat64() handler.
template <class OS>
SyscallReturn
lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
            ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
      return -EFAULT;

    // Adjust path for current working directory
    path = process->fullPath(path);

#if NO_STAT64
    struct stat hostBuf;
    int result = lstat(path.c_str(), &hostBuf);
#else
    struct stat64 hostBuf;
    int result = lstat64(path.c_str(), &hostBuf);
#endif

    if (result < 0)
        return -errno;

    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);

    return 0;
}

/// Target fstat() handler.
template <class OS>
SyscallReturn
fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
          ThreadContext *tc)
{
    int fd = process->sim_fd(tc->getSyscallArg(0));

    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);

    if (fd < 0)
        return -EBADF;

    struct stat hostBuf;
    int result = fstat(fd, &hostBuf);

    if (result < 0)
        return -errno;

    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
        &hostBuf, (fd == 1));

    return 0;
}


/// Target statfs() handler.
template <class OS>
SyscallReturn
statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
           ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
      return -EFAULT;

    // Adjust path for current working directory
    path = process->fullPath(path);

    struct statfs hostBuf;
    int result = statfs(path.c_str(), &hostBuf);

    if (result < 0)
        return -errno;

    OS::copyOutStatfsBuf(tc->getMemPort(),
            (Addr)(tc->getSyscallArg(1)), &hostBuf);

    return 0;
}


/// Target fstatfs() handler.
template <class OS>
SyscallReturn
fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
            ThreadContext *tc)
{
    int fd = process->sim_fd(tc->getSyscallArg(0));

    if (fd < 0)
        return -EBADF;

    struct statfs hostBuf;
    int result = fstatfs(fd, &hostBuf);

    if (result < 0)
        return -errno;

    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
        &hostBuf);

    return 0;
}


/// Target writev() handler.
template <class OS>
SyscallReturn
writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
           ThreadContext *tc)
{
    int fd = tc->getSyscallArg(0);
    if (fd < 0 || process->sim_fd(fd) < 0) {
        // doesn't map to any simulator fd: not a valid target fd
        return -EBADF;
    }

    TranslatingPort *p = tc->getMemPort();
    uint64_t tiov_base = tc->getSyscallArg(1);
    size_t count = tc->getSyscallArg(2);
    struct iovec hiov[count];
    for (int i = 0; i < count; ++i)
    {
        typename OS::tgt_iovec tiov;

        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
        hiov[i].iov_len = gtoh(tiov.iov_len);
        hiov[i].iov_base = new char [hiov[i].iov_len];
        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
                    hiov[i].iov_len);
    }

    int result = writev(process->sim_fd(fd), hiov, count);

    for (int i = 0; i < count; ++i)
    {
        delete [] (char *)hiov[i].iov_base;
    }

    if (result < 0)
        return -errno;

    return 0;
}


/// Target mmap() handler.
///
/// We don't really handle mmap().  If the target is mmaping an
/// anonymous region or /dev/zero, we can get away with doing basically
/// nothing (since memory is initialized to zero and the simulator
/// doesn't really check addresses anyway).  Always print a warning,
/// since this could be seriously broken if we're not mapping
/// /dev/zero.
//
/// Someday we should explicitly check for /dev/zero in open, flag the
/// file descriptor, and fail (or implement!) a non-anonymous mmap to
/// anything else.
template <class OS>
SyscallReturn
mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
{
    Addr start = tc->getSyscallArg(0);
    uint64_t length = tc->getSyscallArg(1);
    // int prot = tc->getSyscallArg(2);
    int flags = tc->getSyscallArg(3);
    // int fd = p->sim_fd(tc->getSyscallArg(4));
    // int offset = tc->getSyscallArg(5);

    if ((start  % TheISA::VMPageSize) != 0 ||
        (length % TheISA::VMPageSize) != 0) {
        warn("mmap failing: arguments not page-aligned: "
             "start 0x%x length 0x%x",
             start, length);
        return -EINVAL;
    }

    if (start != 0) {
        warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
             start, p->mmap_end);
    }

    // pick next address from our "mmap region"
    start = p->mmap_end;
    p->pTable->allocate(start, length);
    p->mmap_end += length;

    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
        warn("allowing mmap of file @ fd %d. "
             "This will break if not /dev/zero.", tc->getSyscallArg(4));
    }

    return start;
}

/// Target getrlimit() handler.
template <class OS>
SyscallReturn
getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
        ThreadContext *tc)
{
    unsigned resource = tc->getSyscallArg(0);
    TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));

    switch (resource) {
        case OS::TGT_RLIMIT_STACK:
            // max stack size in bytes: make up a number (2MB for now)
            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
            rlp->rlim_cur = htog(rlp->rlim_cur);
            rlp->rlim_max = htog(rlp->rlim_max);
            break;

        default:
            std::cerr << "getrlimitFunc: unimplemented resource " << resource
                << std::endl;
            abort();
            break;
    }

    rlp.copyOut(tc->getMemPort());
    return 0;
}

/// Target gettimeofday() handler.
template <class OS>
SyscallReturn
gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
        ThreadContext *tc)
{
    TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));

    getElapsedTime(tp->tv_sec, tp->tv_usec);
    tp->tv_sec += seconds_since_epoch;
    tp->tv_sec = htog(tp->tv_sec);
    tp->tv_usec = htog(tp->tv_usec);

    tp.copyOut(tc->getMemPort());

    return 0;
}


/// Target utimes() handler.
template <class OS>
SyscallReturn
utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
           ThreadContext *tc)
{
    std::string path;

    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
      return -EFAULT;

    TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
    tp.copyIn(tc->getMemPort());

    struct timeval hostTimeval[2];
    for (int i = 0; i < 2; ++i)
    {
        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
    }

    // Adjust path for current working directory
    path = process->fullPath(path);

    int result = utimes(path.c_str(), hostTimeval);

    if (result < 0)
        return -errno;

    return 0;
}
/// Target getrusage() function.
template <class OS>
SyscallReturn
getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
              ThreadContext *tc)
{
    int who = tc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
    TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));

    rup->ru_utime.tv_sec = 0;
    rup->ru_utime.tv_usec = 0;
    rup->ru_stime.tv_sec = 0;
    rup->ru_stime.tv_usec = 0;
    rup->ru_maxrss = 0;
    rup->ru_ixrss = 0;
    rup->ru_idrss = 0;
    rup->ru_isrss = 0;
    rup->ru_minflt = 0;
    rup->ru_majflt = 0;
    rup->ru_nswap = 0;
    rup->ru_inblock = 0;
    rup->ru_oublock = 0;
    rup->ru_msgsnd = 0;
    rup->ru_msgrcv = 0;
    rup->ru_nsignals = 0;
    rup->ru_nvcsw = 0;
    rup->ru_nivcsw = 0;

    switch (who) {
      case OS::TGT_RUSAGE_SELF:
        getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
        rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
        rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
        break;

      case OS::TGT_RUSAGE_CHILDREN:
        // do nothing.  We have no child processes, so they take no time.
        break;

      default:
        // don't really handle THREAD or CHILDREN, but just warn and
        // plow ahead
        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
             who);
    }

    rup.copyOut(tc->getMemPort());

    return 0;
}




#endif // __SIM_SYSCALL_EMUL_HH__