osf_sys.c

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/*
 *  linux/arch/alpha/kernel/osf_sys.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 */

/*
 * This file handles some of the stranger OSF/1 system call interfaces.
 * Some of the system calls expect a non-C calling standard, others have
 * special parameter blocks..
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/utsname.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/major.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/shm.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/types.h>
#include <linux/ipc.h>
#include <linux/namei.h>
#include <linux/uio.h>
#include <linux/vfs.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>

#include <asm/fpu.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/sysinfo.h>
#include <asm/thread_info.h>
#include <asm/hwrpb.h>
#include <asm/processor.h>

/*
 * Brk needs to return an error.  Still support Linux's brk(0) query idiom,
 * which OSF programs just shouldn't be doing.  We're still not quite
 * identical to OSF as we don't return 0 on success, but doing otherwise
 * would require changes to libc.  Hopefully this is good enough.
 */
SYSCALL_DEFINE1(osf_brk, unsigned long, brk)
{
    unsigned long retval = sys_brk(brk);
    if (brk && brk != retval)
        retval = -ENOMEM;
    return retval;
}
 
/*
 * This is pure guess-work..
 */
SYSCALL_DEFINE4(osf_set_program_attributes, unsigned long, text_start,
        unsigned long, text_len, unsigned long, bss_start,
        unsigned long, bss_len)
{
    struct mm_struct *mm;

    mm = current->mm;
    mm->end_code = bss_start + bss_len;
    mm->start_brk = bss_start + bss_len;
    mm->brk = bss_start + bss_len;
#if 0
    printk("set_program_attributes(%lx %lx %lx %lx)\n",
        text_start, text_len, bss_start, bss_len);
#endif
    return 0;
}

/*
 * OSF/1 directory handling functions...
 *
 * The "getdents()" interface is much more sane: the "basep" stuff is
 * braindamage (it can't really handle filesystems where the directory
 * offset differences aren't the same as "d_reclen").
 */
#define NAME_OFFSET offsetof (struct osf_dirent, d_name)

struct osf_dirent {
    unsigned int d_ino;
    unsigned short d_reclen;
    unsigned short d_namlen;
    char d_name[1];
};

struct osf_dirent_callback {
    struct osf_dirent __user *dirent;
    long __user *basep;
    unsigned int count;
    int error;
};

static int
osf_filldir(void *__buf, const char *name, int namlen, loff_t offset,
        u64 ino, unsigned int d_type)
{
    struct osf_dirent __user *dirent;
    struct osf_dirent_callback *buf = (struct osf_dirent_callback *) __buf;
    unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32));
    unsigned int d_ino;

    buf->error = -EINVAL;   /* only used if we fail */
    if (reclen > buf->count)
        return -EINVAL;
    d_ino = ino;
    if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
        buf->error = -EOVERFLOW;
        return -EOVERFLOW;
    }
    if (buf->basep) {
        if (put_user(offset, buf->basep))
            goto Efault;
        buf->basep = NULL;
    }
    dirent = buf->dirent;
    if (put_user(d_ino, &dirent->d_ino) ||
        put_user(namlen, &dirent->d_namlen) ||
        put_user(reclen, &dirent->d_reclen) ||
        copy_to_user(dirent->d_name, name, namlen) ||
        put_user(0, dirent->d_name + namlen))
        goto Efault;
    dirent = (void __user *)dirent + reclen;
    buf->dirent = dirent;
    buf->count -= reclen;
    return 0;
Efault:
    buf->error = -EFAULT;
    return -EFAULT;
}

SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
        struct osf_dirent __user *, dirent, unsigned int, count,
        long __user *, basep)
{
    int error;
    struct fd arg = fdget(fd);
    struct osf_dirent_callback buf;

    if (!arg.file)
        return -EBADF;

    buf.dirent = dirent;
    buf.basep = basep;
    buf.count = count;
    buf.error = 0;

    error = vfs_readdir(arg.file, osf_filldir, &buf);
    if (error >= 0)
        error = buf.error;
    if (count != buf.count)
        error = count - buf.count;

    fdput(arg);
    return error;
}

#undef NAME_OFFSET

SYSCALL_DEFINE6(osf_mmap, unsigned long, addr, unsigned long, len,
        unsigned long, prot, unsigned long, flags, unsigned long, fd,
        unsigned long, off)
{
    unsigned long ret = -EINVAL;

#if 0
    if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
        printk("%s: unimplemented OSF mmap flags %04lx\n", 
            current->comm, flags);
#endif
    if ((off + PAGE_ALIGN(len)) < off)
        goto out;
    if (off & ~PAGE_MASK)
        goto out;
    ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 out:
    return ret;
}

struct osf_stat {
    int     st_dev;
    int     st_pad1;
    unsigned    st_mode;
    unsigned short  st_nlink;
    short       st_nlink_reserved;
    unsigned    st_uid;
    unsigned    st_gid;
    int     st_rdev;
    int     st_ldev;
    long        st_size;
    int     st_pad2;
    int     st_uatime;
    int     st_pad3;
    int     st_umtime;
    int     st_pad4;
    int     st_uctime;
    int     st_pad5;
    int     st_pad6;
    unsigned    st_flags;
    unsigned    st_gen;
    long        st_spare[4];
    unsigned    st_ino;
    int     st_ino_reserved;
    int     st_atime;
    int     st_atime_reserved;
    int     st_mtime;
    int     st_mtime_reserved;
    int     st_ctime;
    int     st_ctime_reserved;
    long        st_blksize;
    long        st_blocks;
};

/*
 * The OSF/1 statfs structure is much larger, but this should
 * match the beginning, at least.
 */
struct osf_statfs {
    short f_type;
    short f_flags;
    int f_fsize;
    int f_bsize;
    int f_blocks;
    int f_bfree;
    int f_bavail;
    int f_files;
    int f_ffree;
    __kernel_fsid_t f_fsid;
};

struct osf_statfs64 {
    short f_type;
    short f_flags;
    int f_pad1;
    int f_pad2;
    int f_pad3;
    int f_pad4;
    int f_pad5;
    int f_pad6;
    int f_pad7;
    __kernel_fsid_t f_fsid;
    u_short f_namemax;
    short f_reserved1;
    int f_spare[8];
    char f_pad8[90];
    char f_pad9[90];
    long mount_info[10];
    u_long f_flags2;
    long f_spare2[14];
    long f_fsize;
    long f_bsize;
    long f_blocks;
    long f_bfree;
    long f_bavail;
    long f_files;
    long f_ffree;
};

static int
linux_to_osf_stat(struct kstat *lstat, struct osf_stat __user *osf_stat)
{
    struct osf_stat tmp = { 0 };

    tmp.st_dev  = lstat->dev;
    tmp.st_mode = lstat->mode;
    tmp.st_nlink    = lstat->nlink;
    tmp.st_uid  = from_kuid_munged(current_user_ns(), lstat->uid);
    tmp.st_gid  = from_kgid_munged(current_user_ns(), lstat->gid);
    tmp.st_rdev = lstat->rdev;
    tmp.st_ldev = lstat->rdev;
    tmp.st_size = lstat->size;
    tmp.st_uatime   = lstat->atime.tv_nsec / 1000;
    tmp.st_umtime   = lstat->mtime.tv_nsec / 1000;
    tmp.st_uctime   = lstat->ctime.tv_nsec / 1000;
    tmp.st_ino  = lstat->ino;
    tmp.st_atime    = lstat->atime.tv_sec;
    tmp.st_mtime    = lstat->mtime.tv_sec;
    tmp.st_ctime    = lstat->ctime.tv_sec;
    tmp.st_blksize  = lstat->blksize;
    tmp.st_blocks   = lstat->blocks;

    return copy_to_user(osf_stat, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}

static int
linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat,
            unsigned long bufsiz)
{
    struct osf_statfs tmp_stat;

    tmp_stat.f_type = linux_stat->f_type;
    tmp_stat.f_flags = 0;   /* mount flags */
    tmp_stat.f_fsize = linux_stat->f_frsize;
    tmp_stat.f_bsize = linux_stat->f_bsize;
    tmp_stat.f_blocks = linux_stat->f_blocks;
    tmp_stat.f_bfree = linux_stat->f_bfree;
    tmp_stat.f_bavail = linux_stat->f_bavail;
    tmp_stat.f_files = linux_stat->f_files;
    tmp_stat.f_ffree = linux_stat->f_ffree;
    tmp_stat.f_fsid = linux_stat->f_fsid;
    if (bufsiz > sizeof(tmp_stat))
        bufsiz = sizeof(tmp_stat);
    return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
}

static int
linux_to_osf_statfs64(struct kstatfs *linux_stat, struct osf_statfs64 __user *osf_stat,
              unsigned long bufsiz)
{
    struct osf_statfs64 tmp_stat = { 0 };

    tmp_stat.f_type = linux_stat->f_type;
    tmp_stat.f_fsize = linux_stat->f_frsize;
    tmp_stat.f_bsize = linux_stat->f_bsize;
    tmp_stat.f_blocks = linux_stat->f_blocks;
    tmp_stat.f_bfree = linux_stat->f_bfree;
    tmp_stat.f_bavail = linux_stat->f_bavail;
    tmp_stat.f_files = linux_stat->f_files;
    tmp_stat.f_ffree = linux_stat->f_ffree;
    tmp_stat.f_fsid = linux_stat->f_fsid;
    if (bufsiz > sizeof(tmp_stat))
        bufsiz = sizeof(tmp_stat);
    return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
}

SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
        struct osf_statfs __user *, buffer, unsigned long, bufsiz)
{
    struct kstatfs linux_stat;
    int error = user_statfs(pathname, &linux_stat);
    if (!error)
        error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
    return error;   
}

SYSCALL_DEFINE2(osf_stat, char __user *, name, struct osf_stat __user *, buf)
{
    struct kstat stat;
    int error;

    error = vfs_stat(name, &stat);
    if (error)
        return error;

    return linux_to_osf_stat(&stat, buf);
}

SYSCALL_DEFINE2(osf_lstat, char __user *, name, struct osf_stat __user *, buf)
{
    struct kstat stat;
    int error;

    error = vfs_lstat(name, &stat);
    if (error)
        return error;

    return linux_to_osf_stat(&stat, buf);
}

SYSCALL_DEFINE2(osf_fstat, int, fd, struct osf_stat __user *, buf)
{
    struct kstat stat;
    int error;

    error = vfs_fstat(fd, &stat);
    if (error)
        return error;

    return linux_to_osf_stat(&stat, buf);
}

SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd,
        struct osf_statfs __user *, buffer, unsigned long, bufsiz)
{
    struct kstatfs linux_stat;
    int error = fd_statfs(fd, &linux_stat);
    if (!error)
        error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
    return error;
}

SYSCALL_DEFINE3(osf_statfs64, char __user *, pathname,
        struct osf_statfs64 __user *, buffer, unsigned long, bufsiz)
{
    struct kstatfs linux_stat;
    int error = user_statfs(pathname, &linux_stat);
    if (!error)
        error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz);
    return error;
}

SYSCALL_DEFINE3(osf_fstatfs64, unsigned long, fd,
        struct osf_statfs64 __user *, buffer, unsigned long, bufsiz)
{
    struct kstatfs linux_stat;
    int error = fd_statfs(fd, &linux_stat);
    if (!error)
        error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz);
    return error;
}

/*
 * Uhh.. OSF/1 mount parameters aren't exactly obvious..
 *
 * Although to be frank, neither are the native Linux/i386 ones..
 */
struct ufs_args {
    char __user *devname;
    int flags;
    uid_t exroot;
};

struct cdfs_args {
    char __user *devname;
    int flags;
    uid_t exroot;

    /* This has lots more here, which Linux handles with the option block
       but I'm too lazy to do the translation into ASCII.  */
};

struct procfs_args {
    char __user *devname;
    int flags;
    uid_t exroot;
};

/*
 * We can't actually handle ufs yet, so we translate UFS mounts to
 * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
 * layout is so braindead it's a major headache doing it.
 *
 * Just how long ago was it written? OTOH our UFS driver may be still
 * unhappy with OSF UFS. [CHECKME]
 */
static int
osf_ufs_mount(const char *dirname, struct ufs_args __user *args, int flags)
{
    int retval;
    struct cdfs_args tmp;
    struct filename *devname;

    retval = -EFAULT;
    if (copy_from_user(&tmp, args, sizeof(tmp)))
        goto out;
    devname = getname(tmp.devname);
    retval = PTR_ERR(devname);
    if (IS_ERR(devname))
        goto out;
    retval = do_mount(devname->name, dirname, "ext2", flags, NULL);
    putname(devname);
 out:
    return retval;
}

static int
osf_cdfs_mount(const char *dirname, struct cdfs_args __user *args, int flags)
{
    int retval;
    struct cdfs_args tmp;
    struct filename *devname;

    retval = -EFAULT;
    if (copy_from_user(&tmp, args, sizeof(tmp)))
        goto out;
    devname = getname(tmp.devname);
    retval = PTR_ERR(devname);
    if (IS_ERR(devname))
        goto out;
    retval = do_mount(devname->name, dirname, "iso9660", flags, NULL);
    putname(devname);
 out:
    return retval;
}

static int
osf_procfs_mount(const char *dirname, struct procfs_args __user *args, int flags)
{
    struct procfs_args tmp;

    if (copy_from_user(&tmp, args, sizeof(tmp)))
        return -EFAULT;

    return do_mount("", dirname, "proc", flags, NULL);
}

SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
        int, flag, void __user *, data)
{
    int retval;
    struct filename *name;

    name = getname(path);
    retval = PTR_ERR(name);
    if (IS_ERR(name))
        goto out;
    switch (typenr) {
    case 1:
        retval = osf_ufs_mount(name->name, data, flag);
        break;
    case 6:
        retval = osf_cdfs_mount(name->name, data, flag);
        break;
    case 9:
        retval = osf_procfs_mount(name->name, data, flag);
        break;
    default:
        retval = -EINVAL;
        printk("osf_mount(%ld, %x)\n", typenr, flag);
    }
    putname(name);
 out:
    return retval;
}

SYSCALL_DEFINE1(osf_utsname, char __user *, name)
{
    int error;

    down_read(&uts_sem);
    error = -EFAULT;
    if (copy_to_user(name + 0, utsname()->sysname, 32))
        goto out;
    if (copy_to_user(name + 32, utsname()->nodename, 32))
        goto out;
    if (copy_to_user(name + 64, utsname()->release, 32))
        goto out;
    if (copy_to_user(name + 96, utsname()->version, 32))
        goto out;
    if (copy_to_user(name + 128, utsname()->machine, 32))
        goto out;

    error = 0;
 out:
    up_read(&uts_sem);  
    return error;
}

SYSCALL_DEFINE0(getpagesize)
{
    return PAGE_SIZE;
}

SYSCALL_DEFINE0(getdtablesize)
{
    return sysctl_nr_open;
}

/*
 * For compatibility with OSF/1 only.  Use utsname(2) instead.
 */
SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
{
    unsigned len;
    int i;

    if (!access_ok(VERIFY_WRITE, name, namelen))
        return -EFAULT;

    len = namelen;
    if (len > 32)
        len = 32;

    down_read(&uts_sem);
    for (i = 0; i < len; ++i) {
        __put_user(utsname()->domainname[i], name + i);
        if (utsname()->domainname[i] == '\0')
            break;
    }
    up_read(&uts_sem);

    return 0;
}

/*
 * The following stuff should move into a header file should it ever
 * be labeled "officially supported."  Right now, there is just enough
 * support to avoid applications (such as tar) printing error
 * messages.  The attributes are not really implemented.
 */

/*
 * Values for Property list entry flag
 */
#define PLE_PROPAGATE_ON_COPY       0x1 /* cp(1) will copy entry
                           by default */
#define PLE_FLAG_MASK           0x1 /* Valid flag values */
#define PLE_FLAG_ALL            -1  /* All flag value */

struct proplistname_args {
    unsigned int pl_mask;
    unsigned int pl_numnames;
    char **pl_names;
};

union pl_args {
    struct setargs {
        char __user *path;
        long follow;
        long nbytes;
        char __user *buf;
    } set;
    struct fsetargs {
        long fd;
        long nbytes;
        char __user *buf;
    } fset;
    struct getargs {
        char __user *path;
        long follow;
        struct proplistname_args __user *name_args;
        long nbytes;
        char __user *buf;
        int __user *min_buf_size;
    } get;
    struct fgetargs {
        long fd;
        struct proplistname_args __user *name_args;
        long nbytes;
        char __user *buf;
        int __user *min_buf_size;
    } fget;
    struct delargs {
        char __user *path;
        long follow;
        struct proplistname_args __user *name_args;
    } del;
    struct fdelargs {
        long fd;
        struct proplistname_args __user *name_args;
    } fdel;
};

enum pl_code {
    PL_SET = 1, PL_FSET = 2,
    PL_GET = 3, PL_FGET = 4,
    PL_DEL = 5, PL_FDEL = 6
};

SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code,
        union pl_args __user *, args)
{
    long error;
    int __user *min_buf_size_ptr;

    switch (code) {
    case PL_SET:
        if (get_user(error, &args->set.nbytes))
            error = -EFAULT;
        break;
    case PL_FSET:
        if (get_user(error, &args->fset.nbytes))
            error = -EFAULT;
        break;
    case PL_GET:
        error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
        if (error)
            break;
        error = put_user(0, min_buf_size_ptr);
        break;
    case PL_FGET:
        error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
        if (error)
            break;
        error = put_user(0, min_buf_size_ptr);
        break;
    case PL_DEL:
    case PL_FDEL:
        error = 0;
        break;
    default:
        error = -EOPNOTSUPP;
        break;
    };
    return error;
}

SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss,
        struct sigstack __user *, uoss)
{
    unsigned long usp = rdusp();
    unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
    unsigned long oss_os = on_sig_stack(usp);
    int error;

    if (uss) {
        void __user *ss_sp;

        error = -EFAULT;
        if (get_user(ss_sp, &uss->ss_sp))
            goto out;

        /* If the current stack was set with sigaltstack, don't
           swap stacks while we are on it.  */
        error = -EPERM;
        if (current->sas_ss_sp && on_sig_stack(usp))
            goto out;

        /* Since we don't know the extent of the stack, and we don't
           track onstack-ness, but rather calculate it, we must 
           presume a size.  Ho hum this interface is lossy.  */
        current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
        current->sas_ss_size = SIGSTKSZ;
    }

    if (uoss) {
        error = -EFAULT;
        if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
            || __put_user(oss_sp, &uoss->ss_sp)
            || __put_user(oss_os, &uoss->ss_onstack))
            goto out;
    }

    error = 0;
 out:
    return error;
}

SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
{
    const char *sysinfo_table[] = {
        utsname()->sysname,
        utsname()->nodename,
        utsname()->release,
        utsname()->version,
        utsname()->machine,
        "alpha",    /* instruction set architecture */
        "dummy",    /* hardware serial number */
        "dummy",    /* hardware manufacturer */
        "dummy",    /* secure RPC domain */
    };
    unsigned long offset;
    const char *res;
    long len, err = -EINVAL;

    offset = command-1;
    if (offset >= ARRAY_SIZE(sysinfo_table)) {
        /* Digital UNIX has a few unpublished interfaces here */
        printk("sysinfo(%d)", command);
        goto out;
    }

    down_read(&uts_sem);
    res = sysinfo_table[offset];
    len = strlen(res)+1;
    if ((unsigned long)len > (unsigned long)count)
        len = count;
    if (copy_to_user(buf, res, len))
        err = -EFAULT;
    else
        err = 0;
    up_read(&uts_sem);
 out:
    return err;
}

SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
        unsigned long, nbytes, int __user *, start, void __user *, arg)
{
    unsigned long w;
    struct percpu_struct *cpu;

    switch (op) {
    case GSI_IEEE_FP_CONTROL:
        /* Return current software fp control & status bits.  */
        /* Note that DU doesn't verify available space here.  */

        w = current_thread_info()->ieee_state & IEEE_SW_MASK;
        w = swcr_update_status(w, rdfpcr());
        if (put_user(w, (unsigned long __user *) buffer))
            return -EFAULT;
        return 0;

    case GSI_IEEE_STATE_AT_SIGNAL:
        /*
         * Not sure anybody will ever use this weird stuff.  These
         * ops can be used (under OSF/1) to set the fpcr that should
         * be used when a signal handler starts executing.
         */
        break;

    case GSI_UACPROC:
        if (nbytes < sizeof(unsigned int))
            return -EINVAL;
        w = current_thread_info()->status & UAC_BITMASK;
        if (put_user(w, (unsigned int __user *)buffer))
            return -EFAULT;
        return 1;

    case GSI_PROC_TYPE:
        if (nbytes < sizeof(unsigned long))
            return -EINVAL;
        cpu = (struct percpu_struct*)
          ((char*)hwrpb + hwrpb->processor_offset);
        w = cpu->type;
        if (put_user(w, (unsigned long  __user*)buffer))
            return -EFAULT;
        return 1;

    case GSI_GET_HWRPB:
        if (nbytes > sizeof(*hwrpb))
            return -EINVAL;
        if (copy_to_user(buffer, hwrpb, nbytes) != 0)
            return -EFAULT;
        return 1;

    default:
        break;
    }

    return -EOPNOTSUPP;
}

SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
        unsigned long, nbytes, int __user *, start, void __user *, arg)
{
    switch (op) {
    case SSI_IEEE_FP_CONTROL: {
        unsigned long swcr, fpcr;
        unsigned int *state;

        /* 
         * Alpha Architecture Handbook 4.7.7.3:
         * To be fully IEEE compiant, we must track the current IEEE
         * exception state in software, because spurious bits can be
         * set in the trap shadow of a software-complete insn.
         */

        if (get_user(swcr, (unsigned long __user *)buffer))
            return -EFAULT;
        state = &current_thread_info()->ieee_state;

        /* Update softare trap enable bits.  */
        *state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);

        /* Update the real fpcr.  */
        fpcr = rdfpcr() & FPCR_DYN_MASK;
        fpcr |= ieee_swcr_to_fpcr(swcr);
        wrfpcr(fpcr);

        return 0;
    }

    case SSI_IEEE_RAISE_EXCEPTION: {
        unsigned long exc, swcr, fpcr, fex;
        unsigned int *state;

        if (get_user(exc, (unsigned long __user *)buffer))
            return -EFAULT;
        state = &current_thread_info()->ieee_state;
        exc &= IEEE_STATUS_MASK;

        /* Update softare trap enable bits.  */
        swcr = (*state & IEEE_SW_MASK) | exc;
        *state |= exc;

        /* Update the real fpcr.  */
        fpcr = rdfpcr();
        fpcr |= ieee_swcr_to_fpcr(swcr);
        wrfpcr(fpcr);

        /* If any exceptions set by this call, and are unmasked,
           send a signal.  Old exceptions are not signaled.  */
        fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
        if (fex) {
            siginfo_t info;
            int si_code = 0;

            if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
            if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
            if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
            if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
            if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
            if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;

            info.si_signo = SIGFPE;
            info.si_errno = 0;
            info.si_code = si_code;
            info.si_addr = NULL;  /* FIXME */
            send_sig_info(SIGFPE, &info, current);
        }
        return 0;
    }

    case SSI_IEEE_STATE_AT_SIGNAL:
    case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
        /*
         * Not sure anybody will ever use this weird stuff.  These
         * ops can be used (under OSF/1) to set the fpcr that should
         * be used when a signal handler starts executing.
         */
        break;

    case SSI_NVPAIRS: {
        unsigned __user *p = buffer;
        unsigned i;
        
        for (i = 0, p = buffer; i < nbytes; ++i, p += 2) {
            unsigned v, w, status;

            if (get_user(v, p) || get_user(w, p + 1))
                return -EFAULT;
            switch (v) {
            case SSIN_UACPROC:
                w &= UAC_BITMASK;
                status = current_thread_info()->status;
                status = (status & ~UAC_BITMASK) | w;
                current_thread_info()->status = status;
                break;
 
            default:
                return -EOPNOTSUPP;
            }
        }
        return 0;
    }
 
    case SSI_LMF:
        return 0;

    default:
        break;
    }

    return -EOPNOTSUPP;
}

/* Translations due to the fact that OSF's time_t is an int.  Which
   affects all sorts of things, like timeval and itimerval.  */

extern struct timezone sys_tz;

struct timeval32
{
    int tv_sec, tv_usec;
};

struct itimerval32
{
    struct timeval32 it_interval;
    struct timeval32 it_value;
};

static inline long
get_tv32(struct timeval *o, struct timeval32 __user *i)
{
    return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
        (__get_user(o->tv_sec, &i->tv_sec) |
         __get_user(o->tv_usec, &i->tv_usec)));
}

static inline long
put_tv32(struct timeval32 __user *o, struct timeval *i)
{
    return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
        (__put_user(i->tv_sec, &o->tv_sec) |
         __put_user(i->tv_usec, &o->tv_usec)));
}

static inline long
get_it32(struct itimerval *o, struct itimerval32 __user *i)
{
    return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
        (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
         __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
         __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
         __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
}

static inline long
put_it32(struct itimerval32 __user *o, struct itimerval *i)
{
    return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
        (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
         __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
         __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
         __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
}

static inline void
jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
{
    value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
    value->tv_sec = jiffies / HZ;
}

SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv,
        struct timezone __user *, tz)
{
    if (tv) {
        struct timeval ktv;
        do_gettimeofday(&ktv);
        if (put_tv32(tv, &ktv))
            return -EFAULT;
    }
    if (tz) {
        if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
            return -EFAULT;
    }
    return 0;
}

SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv,
        struct timezone __user *, tz)
{
    struct timespec kts;
    struct timezone ktz;

    if (tv) {
        if (get_tv32((struct timeval *)&kts, tv))
            return -EFAULT;
    }
    if (tz) {
        if (copy_from_user(&ktz, tz, sizeof(*tz)))
            return -EFAULT;
    }

    kts.tv_nsec *= 1000;

    return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it)
{
    struct itimerval kit;
    int error;

    error = do_getitimer(which, &kit);
    if (!error && put_it32(it, &kit))
        error = -EFAULT;

    return error;
}

SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in,
        struct itimerval32 __user *, out)
{
    struct itimerval kin, kout;
    int error;

    if (in) {
        if (get_it32(&kin, in))
            return -EFAULT;
    } else
        memset(&kin, 0, sizeof(kin));

    error = do_setitimer(which, &kin, out ? &kout : NULL);
    if (error || !out)
        return error;

    if (put_it32(out, &kout))
        return -EFAULT;

    return 0;

}

SYSCALL_DEFINE2(osf_utimes, const char __user *, filename,
        struct timeval32 __user *, tvs)
{
    struct timespec tv[2];

    if (tvs) {
        struct timeval ktvs[2];
        if (get_tv32(&ktvs[0], &tvs[0]) ||
            get_tv32(&ktvs[1], &tvs[1]))
            return -EFAULT;

        if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 ||
            ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000)
            return -EINVAL;

        tv[0].tv_sec = ktvs[0].tv_sec;
        tv[0].tv_nsec = 1000 * ktvs[0].tv_usec;
        tv[1].tv_sec = ktvs[1].tv_sec;
        tv[1].tv_nsec = 1000 * ktvs[1].tv_usec;
    }

    return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0);
}

SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp,
        fd_set __user *, exp, struct timeval32 __user *, tvp)
{
    struct timespec end_time, *to = NULL;
    if (tvp) {
        time_t sec, usec;

        to = &end_time;

        if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
            || __get_user(sec, &tvp->tv_sec)
            || __get_user(usec, &tvp->tv_usec)) {
                return -EFAULT;
        }

        if (sec < 0 || usec < 0)
            return -EINVAL;

        if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC))
            return -EINVAL;     

    }

    /* OSF does not copy back the remaining time.  */
    return core_sys_select(n, inp, outp, exp, to);
}

struct rusage32 {
    struct timeval32 ru_utime;  /* user time used */
    struct timeval32 ru_stime;  /* system time used */
    long    ru_maxrss;      /* maximum resident set size */
    long    ru_ixrss;       /* integral shared memory size */
    long    ru_idrss;       /* integral unshared data size */
    long    ru_isrss;       /* integral unshared stack size */
    long    ru_minflt;      /* page reclaims */
    long    ru_majflt;      /* page faults */
    long    ru_nswap;       /* swaps */
    long    ru_inblock;     /* block input operations */
    long    ru_oublock;     /* block output operations */
    long    ru_msgsnd;      /* messages sent */
    long    ru_msgrcv;      /* messages received */
    long    ru_nsignals;        /* signals received */
    long    ru_nvcsw;       /* voluntary context switches */
    long    ru_nivcsw;      /* involuntary " */
};

SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru)
{
    struct rusage32 r;

    if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
        return -EINVAL;

    memset(&r, 0, sizeof(r));
    switch (who) {
    case RUSAGE_SELF:
        jiffies_to_timeval32(current->utime, &r.ru_utime);
        jiffies_to_timeval32(current->stime, &r.ru_stime);
        r.ru_minflt = current->min_flt;
        r.ru_majflt = current->maj_flt;
        break;
    case RUSAGE_CHILDREN:
        jiffies_to_timeval32(current->signal->cutime, &r.ru_utime);
        jiffies_to_timeval32(current->signal->cstime, &r.ru_stime);
        r.ru_minflt = current->signal->cmin_flt;
        r.ru_majflt = current->signal->cmaj_flt;
        break;
    }

    return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
}

SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
        struct rusage32 __user *, ur)
{
    struct rusage r;
    long ret, err;
    unsigned int status = 0;
    mm_segment_t old_fs;

    if (!ur)
        return sys_wait4(pid, ustatus, options, NULL);

    old_fs = get_fs();
        
    set_fs (KERNEL_DS);
    ret = sys_wait4(pid, (unsigned int __user *) &status, options,
            (struct rusage __user *) &r);
    set_fs (old_fs);

    if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
        return -EFAULT;

    err = 0;
    err |= put_user(status, ustatus);
    err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
    err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
    err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
    err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
    err |= __put_user(r.ru_maxrss, &ur->ru_maxrss);
    err |= __put_user(r.ru_ixrss, &ur->ru_ixrss);
    err |= __put_user(r.ru_idrss, &ur->ru_idrss);
    err |= __put_user(r.ru_isrss, &ur->ru_isrss);
    err |= __put_user(r.ru_minflt, &ur->ru_minflt);
    err |= __put_user(r.ru_majflt, &ur->ru_majflt);
    err |= __put_user(r.ru_nswap, &ur->ru_nswap);
    err |= __put_user(r.ru_inblock, &ur->ru_inblock);
    err |= __put_user(r.ru_oublock, &ur->ru_oublock);
    err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
    err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
    err |= __put_user(r.ru_nsignals, &ur->ru_nsignals);
    err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
    err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw);

    return err ? err : ret;
}

/*
 * I don't know what the parameters are: the first one
 * seems to be a timeval pointer, and I suspect the second
 * one is the time remaining.. Ho humm.. No documentation.
 */
SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep,
        struct timeval32 __user *, remain)
{
    struct timeval tmp;
    unsigned long ticks;

    if (get_tv32(&tmp, sleep))
        goto fault;

    ticks = timeval_to_jiffies(&tmp);

    ticks = schedule_timeout_interruptible(ticks);

    if (remain) {
        jiffies_to_timeval(ticks, &tmp);
        if (put_tv32(remain, &tmp))
            goto fault;
    }
    
    return 0;
 fault:
    return -EFAULT;
}


struct timex32 {
    unsigned int modes; /* mode selector */
    long offset;        /* time offset (usec) */
    long freq;      /* frequency offset (scaled ppm) */
    long maxerror;      /* maximum error (usec) */
    long esterror;      /* estimated error (usec) */
    int status;     /* clock command/status */
    long constant;      /* pll time constant */
    long precision;     /* clock precision (usec) (read only) */
    long tolerance;     /* clock frequency tolerance (ppm)
                 * (read only)
                 */
    struct timeval32 time;  /* (read only) */
    long tick;      /* (modified) usecs between clock ticks */

    long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
    long jitter;            /* pps jitter (us) (ro) */
    int shift;              /* interval duration (s) (shift) (ro) */
    long stabil;            /* pps stability (scaled ppm) (ro) */
    long jitcnt;            /* jitter limit exceeded (ro) */
    long calcnt;            /* calibration intervals (ro) */
    long errcnt;            /* calibration errors (ro) */
    long stbcnt;            /* stability limit exceeded (ro) */

    int  :32; int  :32; int  :32; int  :32;
    int  :32; int  :32; int  :32; int  :32;
    int  :32; int  :32; int  :32; int  :32;
};

SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p)
{
        struct timex txc;
    int ret;

    /* copy relevant bits of struct timex. */
    if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
        copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) - 
               offsetof(struct timex32, time)))
      return -EFAULT;

    ret = do_adjtimex(&txc);    
    if (ret < 0)
      return ret;
    
    /* copy back to timex32 */
    if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
        (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) - 
              offsetof(struct timex32, tick))) ||
        (put_tv32(&txc_p->time, &txc.time)))
      return -EFAULT;

    return ret;
}

/* Get an address range which is currently unmapped.  Similar to the
   generic version except that we know how to honor ADDR_LIMIT_32BIT.  */

static unsigned long
arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
                 unsigned long limit)
{
    struct vm_area_struct *vma = find_vma(current->mm, addr);

    while (1) {
        /* At this point:  (!vma || addr < vma->vm_end). */
        if (limit - len < addr)
            return -ENOMEM;
        if (!vma || addr + len <= vma->vm_start)
            return addr;
        addr = vma->vm_end;
        vma = vma->vm_next;
    }
}

unsigned long
arch_get_unmapped_area(struct file *filp, unsigned long addr,
               unsigned long len, unsigned long pgoff,
               unsigned long flags)
{
    unsigned long limit;

    /* "32 bit" actually means 31 bit, since pointers sign extend.  */
    if (current->personality & ADDR_LIMIT_32BIT)
        limit = 0x80000000;
    else
        limit = TASK_SIZE;

    if (len > limit)
        return -ENOMEM;

    if (flags & MAP_FIXED)
        return addr;

    /* First, see if the given suggestion fits.

       The OSF/1 loader (/sbin/loader) relies on us returning an
       address larger than the requested if one exists, which is
       a terribly broken way to program.

       That said, I can see the use in being able to suggest not
       merely specific addresses, but regions of memory -- perhaps
       this feature should be incorporated into all ports?  */

    if (addr) {
        addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
        if (addr != (unsigned long) -ENOMEM)
            return addr;
    }

    /* Next, try allocating at TASK_UNMAPPED_BASE.  */
    addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
                     len, limit);
    if (addr != (unsigned long) -ENOMEM)
        return addr;

    /* Finally, try allocating in low memory.  */
    addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);

    return addr;
}

#ifdef CONFIG_OSF4_COMPAT

/* Clear top 32 bits of iov_len in the user's buffer for
   compatibility with old versions of OSF/1 where iov_len
   was defined as int. */
static int
osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
{
    unsigned long i;

    for (i = 0 ; i < count ; i++) {
        int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;

        if (put_user(0, iov_len_high))
            return -EFAULT;
    }
    return 0;
}

SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
        const struct iovec __user *, vector, unsigned long, count)
{
    if (unlikely(personality(current->personality) == PER_OSF4))
        if (osf_fix_iov_len(vector, count))
            return -EFAULT;
    return sys_readv(fd, vector, count);
}

SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
        const struct iovec __user *, vector, unsigned long, count)
{
    if (unlikely(personality(current->personality) == PER_OSF4))
        if (osf_fix_iov_len(vector, count))
            return -EFAULT;
    return sys_writev(fd, vector, count);
}

#endif

SYSCALL_DEFINE2(osf_getpriority, int, which, int, who)
{
    int prio = sys_getpriority(which, who);
    if (prio >= 0) {
        /* Return value is the unbiased priority, i.e. 20 - prio.
           This does result in negative return values, so signal
           no error */
        force_successful_syscall_return();
        prio = 20 - prio;
    }
    return prio;
}

SYSCALL_DEFINE0(getxuid)
{
    current_pt_regs()->r20 = sys_geteuid();
    return sys_getuid();
}

SYSCALL_DEFINE0(getxgid)
{
    current_pt_regs()->r20 = sys_getegid();
    return sys_getgid();
}

SYSCALL_DEFINE0(getxpid)
{
    current_pt_regs()->r20 = sys_getppid();
    return sys_getpid();
}

SYSCALL_DEFINE0(alpha_pipe)
{
    int fd[2];
    int res = do_pipe_flags(fd, 0);
    if (!res) {
        /* The return values are in $0 and $20.  */
        current_pt_regs()->r20 = fd[1];
        res = fd[0];
    }
    return res;
}

SYSCALL_DEFINE1(sethae, unsigned long, val)
{
    current_pt_regs()->hae = val;
    return 0;
}