patch-2.6.6-vs1.9.0

[linux-2.6.git] / arch / x86_64 / ia32 / sys_ia32.c

/*
 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
 *             sys_sparc32 
 *
 * Copyright (C) 2000           VA Linux Co
 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2000           Hewlett-Packard Co.
 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port) 
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment. In 2.5 most of this should be moved to a generic directory. 
 *
 * This file assumes that there is a hole at the end of user address space.
 * 
 * Some of the functions are LE specific currently. These are hopefully all marked.
 * This should be fixed.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h> 
#include <linux/file.h> 
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/mm.h>
#include <linux/shm.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/nfs_fs.h>
#include <linux/quota.h>
#include <linux/module.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/ipc.h>
#include <linux/rwsem.h>
#include <linux/binfmts.h>
#include <linux/init.h>
#include <linux/aio_abi.h>
#include <linux/aio.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/highuid.h>
#include <linux/vmalloc.h>
#include <asm/mman.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/ipc.h>
#include <asm/atomic.h>
#include <asm/ldt.h>

#include <net/scm.h>
#include <net/sock.h>
#include <asm/ia32.h>

#define A(__x)          ((unsigned long)(__x))
#define AA(__x)         ((unsigned long)(__x))
#define ROUND_UP(x,a)   ((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))

int cp_compat_stat(struct kstat *kbuf, struct compat_stat *ubuf)
{
        typeof(ubuf->st_uid) uid = 0;
        typeof(ubuf->st_gid) gid = 0;
        SET_UID(uid, kbuf->uid);
        SET_GID(gid, kbuf->gid);
        if (!old_valid_dev(kbuf->dev) || !old_valid_dev(kbuf->rdev))
                return -EOVERFLOW;
        if (kbuf->size >= 0x7fffffff)
                return -EOVERFLOW;
        if (verify_area(VERIFY_WRITE, ubuf, sizeof(struct compat_stat)) ||
            __put_user (old_encode_dev(kbuf->dev), &ubuf->st_dev) ||
            __put_user (kbuf->ino, &ubuf->st_ino) ||
            __put_user (kbuf->mode, &ubuf->st_mode) ||
            __put_user (kbuf->nlink, &ubuf->st_nlink) ||
            __put_user (uid, &ubuf->st_uid) ||
            __put_user (gid, &ubuf->st_gid) ||
            __put_user (old_encode_dev(kbuf->rdev), &ubuf->st_rdev) ||
            __put_user (kbuf->size, &ubuf->st_size) ||
            __put_user (kbuf->atime.tv_sec, &ubuf->st_atime) ||
            __put_user (kbuf->atime.tv_nsec, &ubuf->st_atime_nsec) ||
            __put_user (kbuf->mtime.tv_sec, &ubuf->st_mtime) ||
            __put_user (kbuf->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
            __put_user (kbuf->ctime.tv_sec, &ubuf->st_ctime) ||
            __put_user (kbuf->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
            __put_user (kbuf->blksize, &ubuf->st_blksize) ||
            __put_user (kbuf->blocks, &ubuf->st_blocks))
                return -EFAULT;
        return 0;
}

asmlinkage long
sys32_truncate64(char * filename, unsigned long offset_low, unsigned long offset_high)
{
       return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
}

asmlinkage long
sys32_ftruncate64(unsigned int fd, unsigned long offset_low, unsigned long offset_high)
{
       return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
}

/* Another set for IA32/LFS -- x86_64 struct stat is different due to 
   support for 64bit inode numbers. */

static int
cp_stat64(struct stat64 *ubuf, struct kstat *stat)
{
        typeof(ubuf->st_uid) uid = 0;
        typeof(ubuf->st_gid) gid = 0;
        SET_UID(uid, stat->uid);
        SET_GID(gid, stat->gid);
        if (verify_area(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
            __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
            __put_user (stat->ino, &ubuf->__st_ino) ||
            __put_user (stat->ino, &ubuf->st_ino) ||
            __put_user (stat->mode, &ubuf->st_mode) ||
            __put_user (stat->nlink, &ubuf->st_nlink) ||
            __put_user (uid, &ubuf->st_uid) ||
            __put_user (gid, &ubuf->st_gid) ||
            __put_user (huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
            __put_user (stat->size, &ubuf->st_size) ||
            __put_user (stat->atime.tv_sec, &ubuf->st_atime) ||
            __put_user (stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
            __put_user (stat->mtime.tv_sec, &ubuf->st_mtime) ||
            __put_user (stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
            __put_user (stat->ctime.tv_sec, &ubuf->st_ctime) ||
            __put_user (stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
            __put_user (stat->blksize, &ubuf->st_blksize) ||
            __put_user (stat->blocks, &ubuf->st_blocks))
                return -EFAULT;
        return 0;
}

asmlinkage long
sys32_stat64(char * filename, struct stat64 *statbuf)
{
        struct kstat stat;
        int ret = vfs_stat(filename, &stat);
        if (!ret)
                ret = cp_stat64(statbuf, &stat);
        return ret;
}

asmlinkage long
sys32_lstat64(char * filename, struct stat64 *statbuf)
{
        struct kstat stat;
        int ret = vfs_lstat(filename, &stat);
        if (!ret)
                ret = cp_stat64(statbuf, &stat);
        return ret;
}

asmlinkage long
sys32_fstat64(unsigned int fd, struct stat64 *statbuf)
{
        struct kstat stat;
        int ret = vfs_fstat(fd, &stat);
        if (!ret)
                ret = cp_stat64(statbuf, &stat);
        return ret;
}

/*
 * Linux/i386 didn't use to be able to handle more than
 * 4 system call parameters, so these system calls used a memory
 * block for parameter passing..
 */

struct mmap_arg_struct {
        unsigned int addr;
        unsigned int len;
        unsigned int prot;
        unsigned int flags;
        unsigned int fd;
        unsigned int offset;
};

asmlinkage long
sys32_mmap(struct mmap_arg_struct *arg)
{
        struct mmap_arg_struct a;
        struct file *file = NULL;
        unsigned long retval;
        struct mm_struct *mm ;

        if (copy_from_user(&a, arg, sizeof(a)))
                return -EFAULT;

        if (a.offset & ~PAGE_MASK)
                return -EINVAL; 

        if (!(a.flags & MAP_ANONYMOUS)) {
                file = fget(a.fd);
                if (!file)
                        return -EBADF;
        }
        
        if (a.prot & PROT_READ) 
                a.prot |= vm_force_exec32;

        mm = current->mm; 
        down_write(&mm->mmap_sem); 
        retval = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, a.offset>>PAGE_SHIFT);
        if (file)
                fput(file);

        up_write(&mm->mmap_sem); 

        return retval;
}

asmlinkage long 
sys32_mprotect(unsigned long start, size_t len, unsigned long prot)
{
        if (prot & PROT_READ) 
                prot |= vm_force_exec32;
        return sys_mprotect(start,len,prot); 
}

asmlinkage long
sys32_pipe(int *fd)
{
        int retval;
        int fds[2];

        retval = do_pipe(fds);
        if (retval)
                goto out;
        if (copy_to_user(fd, fds, sizeof(fds)))
                retval = -EFAULT;
  out:
        return retval;
}

asmlinkage long
sys32_rt_sigaction(int sig, struct sigaction32 *act,
                   struct sigaction32 *oact,  unsigned int sigsetsize)
{
        struct k_sigaction new_ka, old_ka;
        int ret;
        compat_sigset_t set32;

        /* XXX: Don't preclude handling different sized sigset_t's.  */
        if (sigsetsize != sizeof(compat_sigset_t))
                return -EINVAL;

        if (act) {
                compat_uptr_t handler, restorer;

                if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
                    __get_user(handler, &act->sa_handler) ||
                    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
                    __get_user(restorer, &act->sa_restorer)||
                    __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t)))
                        return -EFAULT;
                new_ka.sa.sa_handler = compat_ptr(handler);
                new_ka.sa.sa_restorer = compat_ptr(restorer);
                /* FIXME: here we rely on _COMPAT_NSIG_WORS to be >= than _NSIG_WORDS << 1 */
                switch (_NSIG_WORDS) {
                case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
                                | (((long)set32.sig[7]) << 32);
                case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
                                | (((long)set32.sig[5]) << 32);
                case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
                                | (((long)set32.sig[3]) << 32);
                case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
                                | (((long)set32.sig[1]) << 32);
                }
        }

        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

        if (!ret && oact) {
                /* FIXME: here we rely on _COMPAT_NSIG_WORS to be >= than _NSIG_WORDS << 1 */
                switch (_NSIG_WORDS) {
                case 4:
                        set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
                        set32.sig[6] = old_ka.sa.sa_mask.sig[3];
                case 3:
                        set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
                        set32.sig[4] = old_ka.sa.sa_mask.sig[2];
                case 2:
                        set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
                        set32.sig[2] = old_ka.sa.sa_mask.sig[1];
                case 1:
                        set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
                        set32.sig[0] = old_ka.sa.sa_mask.sig[0];
                }
                if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
                    __put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) ||
                    __put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) ||
                    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
                    __copy_to_user(&oact->sa_mask, &set32, sizeof(compat_sigset_t)))
                        return -EFAULT;
        }

        return ret;
}

asmlinkage long
sys32_sigaction (int sig, struct old_sigaction32 *act, struct old_sigaction32 *oact)
{
        struct k_sigaction new_ka, old_ka;
        int ret;

        if (act) {
                compat_old_sigset_t mask;
                compat_uptr_t handler, restorer;

                if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
                    __get_user(handler, &act->sa_handler) ||
                    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
                    __get_user(restorer, &act->sa_restorer) ||
                    __get_user(mask, &act->sa_mask))
                        return -EFAULT;

                new_ka.sa.sa_handler = compat_ptr(handler);
                new_ka.sa.sa_restorer = compat_ptr(restorer);

                siginitset(&new_ka.sa.sa_mask, mask);
        }

        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

        if (!ret && oact) {
                if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
                    __put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) ||
                    __put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) ||
                    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
                    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
                        return -EFAULT;
        }

        return ret;
}

asmlinkage long
sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
                        compat_sigset_t __user *oset, unsigned int sigsetsize)
{
        sigset_t s;
        compat_sigset_t s32;
        int ret;
        mm_segment_t old_fs = get_fs();
        
        if (set) {
                if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
                        return -EFAULT;
                switch (_NSIG_WORDS) {
                case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
                case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
                case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
                case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
                }
        }
        set_fs (KERNEL_DS);
        ret = sys_rt_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL,
                                 sigsetsize); 
        set_fs (old_fs);
        if (ret) return ret;
        if (oset) {
                switch (_NSIG_WORDS) {
                case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
                case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
                case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
                case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
                }
                if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
                        return -EFAULT;
        }
        return 0;
}

static inline long
get_tv32(struct timeval *o, struct compat_timeval *i)
{
        int err = -EFAULT; 
        if (access_ok(VERIFY_READ, i, sizeof(*i))) { 
                err = __get_user(o->tv_sec, &i->tv_sec);
                err |= __get_user(o->tv_usec, &i->tv_usec);
        }
        return err; 
}

static inline long
put_tv32(struct compat_timeval *o, struct timeval *i)
{
        int err = -EFAULT;
        if (access_ok(VERIFY_WRITE, o, sizeof(*o))) { 
                err = __put_user(i->tv_sec, &o->tv_sec);
                err |= __put_user(i->tv_usec, &o->tv_usec);
        } 
        return err; 
}

extern int do_setitimer(int which, struct itimerval *, struct itimerval *);

asmlinkage long
sys32_alarm(unsigned int seconds)
{
        struct itimerval it_new, it_old;
        unsigned int oldalarm;

        it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
        it_new.it_value.tv_sec = seconds;
        it_new.it_value.tv_usec = 0;
        do_setitimer(ITIMER_REAL, &it_new, &it_old);
        oldalarm = it_old.it_value.tv_sec;
        /* ehhh.. We can't return 0 if we have an alarm pending.. */
        /* And we'd better return too much than too little anyway */
        if (it_old.it_value.tv_usec)
                oldalarm++;
        return oldalarm;
}

/* Translations due to time_t size differences.  Which affects all
   sorts of things, like timeval and itimerval.  */

extern struct timezone sys_tz;

asmlinkage long
sys32_gettimeofday(struct compat_timeval *tv, struct timezone *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;
}

asmlinkage long
sys32_settimeofday(struct compat_timeval *tv, struct timezone *tz)
{
        struct timeval ktv;
        struct timespec kts;
        struct timezone ktz;

        if (tv) {
                if (get_tv32(&ktv, tv))
                        return -EFAULT;
                kts.tv_sec = ktv.tv_sec;
                kts.tv_nsec = ktv.tv_usec * NSEC_PER_USEC;
        }
        if (tz) {
                if (copy_from_user(&ktz, tz, sizeof(ktz)))
                        return -EFAULT;
        }

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

struct linux32_dirent {
        u32     d_ino;
        u32     d_off;
        u16     d_reclen;
        char    d_name[1];
};

struct old_linux32_dirent {
        u32     d_ino;
        u32     d_offset;
        u16     d_namlen;
        char    d_name[1];
};

struct getdents32_callback {
        struct linux32_dirent * current_dir;
        struct linux32_dirent * previous;
        int count;
        int error;
};

struct readdir32_callback {
        struct old_linux32_dirent * dirent;
        int count;
};

static int
filldir32 (void *__buf, const char *name, int namlen, loff_t offset, ino_t ino,
           unsigned int d_type)
{
        struct linux32_dirent * dirent;
        struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
        int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 2, 4);

        buf->error = -EINVAL;   /* only used if we fail.. */
        if (reclen > buf->count)
                return -EINVAL;
        dirent = buf->previous;
        if (dirent)
                put_user(offset, &dirent->d_off);
        dirent = buf->current_dir;
        buf->previous = dirent;
        put_user(ino, &dirent->d_ino);
        put_user(reclen, &dirent->d_reclen);
        copy_to_user(dirent->d_name, name, namlen);
        put_user(0, dirent->d_name + namlen);
        put_user(d_type, (char *)dirent + reclen - 1); 
        dirent = ((void *)dirent) + reclen;
        buf->current_dir = dirent;
        buf->count -= reclen;
        return 0;
}

asmlinkage long
sys32_getdents (unsigned int fd, void * dirent, unsigned int count)
{
        struct file * file;
        struct linux32_dirent * lastdirent;
        struct getdents32_callback buf;
        int error;

        error = -EBADF;
        file = fget(fd);
        if (!file)
                goto out;

        buf.current_dir = (struct linux32_dirent *) dirent;
        buf.previous = NULL;
        buf.count = count;
        buf.error = 0;

        error = vfs_readdir(file, filldir32, &buf);
        if (error < 0)
                goto out_putf;
        error = buf.error;
        lastdirent = buf.previous;
        if (lastdirent) {
                put_user(file->f_pos, &lastdirent->d_off);
                error = count - buf.count;
        }

out_putf:
        fput(file);
out:
        return error;
}

static int
fillonedir32 (void * __buf, const char * name, int namlen, loff_t offset, ino_t ino, unsigned d_type)
{
        struct readdir32_callback * buf = (struct readdir32_callback *) __buf;
        struct old_linux32_dirent * dirent;

        if (buf->count)
                return -EINVAL;
        buf->count++;
        dirent = buf->dirent;
        put_user(ino, &dirent->d_ino);
        put_user(offset, &dirent->d_offset);
        put_user(namlen, &dirent->d_namlen);
        copy_to_user(dirent->d_name, name, namlen);
        put_user(0, dirent->d_name + namlen);
        return 0;
}

asmlinkage long
sys32_oldreaddir (unsigned int fd, void * dirent, unsigned int count)
{
        int error;
        struct file * file;
        struct readdir32_callback buf;

        error = -EBADF;
        file = fget(fd);
        if (!file)
                goto out;

        buf.count = 0;
        buf.dirent = dirent;

        error = vfs_readdir(file, fillonedir32, &buf);
        if (error >= 0)
                error = buf.count;
        fput(file);
out:
        return error;
}

/*
 * We can actually return ERESTARTSYS instead of EINTR, but I'd
 * like to be certain this leads to no problems. So I return
 * EINTR just for safety.
 *
 * Update: ERESTARTSYS breaks at least the xview clock binary, so
 * I'm trying ERESTARTNOHAND which restart only when you want to.
 */
#define MAX_SELECT_SECONDS \
        ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
#define ROUND_UP_TIME(x,y) (((x)+(y)-1)/(y))

asmlinkage long
sys32_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct compat_timeval *tvp32)
{
        fd_set_bits fds;
        char *bits;
        long timeout;
        int ret, size;

        timeout = MAX_SCHEDULE_TIMEOUT;
        if (tvp32) {
                time_t sec, usec;

                get_user(sec, &tvp32->tv_sec);
                get_user(usec, &tvp32->tv_usec);

                ret = -EINVAL;
                if (sec < 0 || usec < 0)
                        goto out_nofds;

                if ((unsigned long) sec < MAX_SELECT_SECONDS) {
                        timeout = ROUND_UP_TIME(usec, 1000000/HZ);
                        timeout += sec * (unsigned long) HZ;
                }
        }

        ret = -EINVAL;
        if (n < 0)
                goto out_nofds;

        if (n > current->files->max_fdset)
                n = current->files->max_fdset;

        /*
         * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
         * since we used fdset we need to allocate memory in units of
         * long-words. 
         */
        ret = -ENOMEM;
        size = FDS_BYTES(n);
        bits = kmalloc(6 * size, GFP_KERNEL);
        if (!bits)
                goto out_nofds;
        fds.in      = (unsigned long *)  bits;
        fds.out     = (unsigned long *) (bits +   size);
        fds.ex      = (unsigned long *) (bits + 2*size);
        fds.res_in  = (unsigned long *) (bits + 3*size);
        fds.res_out = (unsigned long *) (bits + 4*size);
        fds.res_ex  = (unsigned long *) (bits + 5*size);

        if ((ret = get_fd_set(n, inp, fds.in)) ||
            (ret = get_fd_set(n, outp, fds.out)) ||
            (ret = get_fd_set(n, exp, fds.ex)))
                goto out;
        zero_fd_set(n, fds.res_in);
        zero_fd_set(n, fds.res_out);
        zero_fd_set(n, fds.res_ex);

        ret = do_select(n, &fds, &timeout);

        if (tvp32 && !(current->personality & STICKY_TIMEOUTS)) {
                time_t sec = 0, usec = 0;
                if (timeout) {
                        sec = timeout / HZ;
                        usec = timeout % HZ;
                        usec *= (1000000/HZ);
                }
                put_user(sec, (int *)&tvp32->tv_sec);
                put_user(usec, (int *)&tvp32->tv_usec);
        }

        if (ret < 0)
                goto out;
        if (!ret) {
                ret = -ERESTARTNOHAND;
                if (signal_pending(current))
                        goto out;
                ret = 0;
        }

        set_fd_set(n, inp, fds.res_in);
        set_fd_set(n, outp, fds.res_out);
        set_fd_set(n, exp, fds.res_ex);

out:
        kfree(bits);
out_nofds:
        return ret;
}

struct sel_arg_struct {
        unsigned int n;
        unsigned int inp;
        unsigned int outp;
        unsigned int exp;
        unsigned int tvp;
};

asmlinkage long
sys32_old_select(struct sel_arg_struct *arg)
{
        struct sel_arg_struct a;

        if (copy_from_user(&a, arg, sizeof(a)))
                return -EFAULT;
        return sys32_select(a.n, (fd_set *)A(a.inp), (fd_set *)A(a.outp), (fd_set *)A(a.exp),
                            (struct compat_timeval *)A(a.tvp));
}

static struct iovec *
get_compat_iovec(struct compat_iovec *iov32, struct iovec *iov_buf, u32 *count, int type, int *errp)
{
        int i;
        u32 buf, len;
        struct iovec *ivp, *iov;
        unsigned long totlen; 

        /* Get the "struct iovec" from user memory */

        *errp = 0;
        if (!*count)
                return 0;
        *errp = -EINVAL;
        if (*count > UIO_MAXIOV)
                return(struct iovec *)0;
        *errp = -EFAULT;
        if(verify_area(VERIFY_READ, iov32, sizeof(struct compat_iovec)*(*count)))
                return(struct iovec *)0;
        if (*count > UIO_FASTIOV) {
                *errp = -ENOMEM; 
                iov = kmalloc(*count*sizeof(struct iovec), GFP_KERNEL);
                if (!iov)
                        return((struct iovec *)0);
        } else
                iov = iov_buf;

        ivp = iov;
        totlen = 0;
        for (i = 0; i < *count; i++) {
                *errp = __get_user(len, &iov32->iov_len) |
                        __get_user(buf, &iov32->iov_base);      
                if (*errp)
                        goto error;
                *errp = verify_area(type, (void *)A(buf), len);
                if (*errp) {
                        if (i > 0) { 
                                *count = i;
                                break;
                        } 
                        goto error;
                }
                /* SuS checks: */
                *errp = -EINVAL; 
                if ((int)len < 0)
                        goto error;
                if ((totlen += len) >= 0x7fffffff)
                        goto error;                     
                ivp->iov_base = (void *)A(buf);
                ivp->iov_len = (__kernel_size_t)len;
                iov32++;
                ivp++;
        }
        *errp = 0;
        return(iov);

error:
        if (iov != iov_buf)
                kfree(iov);
        return NULL;
}

asmlinkage long
sys32_readv(int fd, struct compat_iovec *vector, u32 count)
{
        struct iovec iovstack[UIO_FASTIOV];
        struct iovec *iov;
        int ret;
        mm_segment_t old_fs = get_fs();

        if ((iov = get_compat_iovec(vector, iovstack, &count, VERIFY_WRITE, &ret)) == NULL)
                return ret;
        set_fs(KERNEL_DS);
        ret = sys_readv(fd, iov, count);
        set_fs(old_fs);
        if (iov != iovstack)
                kfree(iov);
        return ret;
}

asmlinkage long
sys32_writev(int fd, struct compat_iovec *vector, u32 count)
{
        struct iovec iovstack[UIO_FASTIOV];
        struct iovec *iov;
        int ret;
        mm_segment_t old_fs = get_fs();

        if ((iov = get_compat_iovec(vector, iovstack, &count, VERIFY_READ, &ret)) == NULL)
                return ret;
        set_fs(KERNEL_DS);
        ret = sys_writev(fd, iov, count);
        set_fs(old_fs);
        if (iov != iovstack)
                kfree(iov);
        return ret;
}

/*
 * sys_time() can be implemented in user-level using
 * sys_gettimeofday().  x86-64 did this but i386 Linux did not
 * so we have to implement this system call here.
 */
asmlinkage long sys32_time(int * tloc)
{
        int i;
        struct timeval tv;

        do_gettimeofday(&tv);
        i = tv.tv_sec;

        if (tloc) {
                if (put_user(i,tloc))
                        i = -EFAULT;
        }
        return i;
}

extern asmlinkage long
compat_sys_wait4(compat_pid_t pid, compat_uint_t * stat_addr, int options,
                 struct compat_rusage *ru);

asmlinkage long
sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr, int options)
{
        return compat_sys_wait4(pid, stat_addr, options, NULL);
}

int sys32_ni_syscall(int call)
{ 
        struct task_struct *me = current;
        static char lastcomm[8];
        if (strcmp(lastcomm, me->comm)) {
        printk(KERN_INFO "IA32 syscall %d from %s not implemented\n", call,
               current->comm);
                strcpy(lastcomm, me->comm); 
        } 
        return -ENOSYS;        
} 

/* 32-bit timeval and related flotsam.  */

asmlinkage long
sys32_sysfs(int option, u32 arg1, u32 arg2)
{
        return sys_sysfs(option, arg1, arg2);
}

struct sysinfo32 {
        s32 uptime;
        u32 loads[3];
        u32 totalram;
        u32 freeram;
        u32 sharedram;
        u32 bufferram;
        u32 totalswap;
        u32 freeswap;
        unsigned short procs;
        unsigned short pad; 
        u32 totalhigh;
        u32 freehigh;
        u32 mem_unit;
        char _f[20-2*sizeof(u32)-sizeof(int)];
};

asmlinkage long
sys32_sysinfo(struct sysinfo32 *info)
{
        struct sysinfo s;
        int ret;
        mm_segment_t old_fs = get_fs ();
        int bitcount = 0;
        
        set_fs (KERNEL_DS);
        ret = sys_sysinfo(&s);
        set_fs (old_fs);

        /* Check to see if any memory value is too large for 32-bit and scale
         *  down if needed
         */
        if ((s.totalram >> 32) || (s.totalswap >> 32)) {
                while (s.mem_unit < PAGE_SIZE) {
                        s.mem_unit <<= 1;
                        bitcount++;
                }
                s.totalram >>= bitcount;
                s.freeram >>= bitcount;
                s.sharedram >>= bitcount;
                s.bufferram >>= bitcount;
                s.totalswap >>= bitcount;
                s.freeswap >>= bitcount;
                s.totalhigh >>= bitcount;
                s.freehigh >>= bitcount;
        }

        if (verify_area(VERIFY_WRITE, info, sizeof(struct sysinfo32)) ||
            __put_user (s.uptime, &info->uptime) ||
            __put_user (s.loads[0], &info->loads[0]) ||
            __put_user (s.loads[1], &info->loads[1]) ||
            __put_user (s.loads[2], &info->loads[2]) ||
            __put_user (s.totalram, &info->totalram) ||
            __put_user (s.freeram, &info->freeram) ||
            __put_user (s.sharedram, &info->sharedram) ||
            __put_user (s.bufferram, &info->bufferram) ||
            __put_user (s.totalswap, &info->totalswap) ||
            __put_user (s.freeswap, &info->freeswap) ||
            __put_user (s.procs, &info->procs) ||
            __put_user (s.totalhigh, &info->totalhigh) || 
            __put_user (s.freehigh, &info->freehigh) ||
            __put_user (s.mem_unit, &info->mem_unit))
                return -EFAULT;
        return 0;
}
                
asmlinkage long
sys32_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec *interval)
{
        struct timespec t;
        int ret;
        mm_segment_t old_fs = get_fs ();
        
        set_fs (KERNEL_DS);
        ret = sys_sched_rr_get_interval(pid, &t);
        set_fs (old_fs);
        if (put_compat_timespec(&t, interval))
                return -EFAULT;
        return ret;
}

asmlinkage long
sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
{
        sigset_t s;
        compat_sigset_t s32;
        int ret;
        mm_segment_t old_fs = get_fs();
                
        set_fs (KERNEL_DS);
        ret = sys_rt_sigpending(&s, sigsetsize);
        set_fs (old_fs);
        if (!ret) {
                switch (_NSIG_WORDS) {
                case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
                case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
                case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
                case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
                }
                if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
                        return -EFAULT;
        }
        return ret;
}


asmlinkage long
sys32_rt_sigtimedwait(compat_sigset_t *uthese, siginfo_t32 *uinfo,
                      struct compat_timespec *uts, compat_size_t sigsetsize)
{
        sigset_t s;
        compat_sigset_t s32;
        struct timespec t;
        int ret;
        mm_segment_t old_fs = get_fs();
        siginfo_t info;
                
        if (copy_from_user (&s32, uthese, sizeof(compat_sigset_t)))
                return -EFAULT;
        switch (_NSIG_WORDS) {
        case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
        case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
        case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
        case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
        }
        if (uts && get_compat_timespec(&t, uts))
                return -EFAULT;
        if (uinfo) {
                /* stop data leak to user space in case of structure fill mismatch
                 * between sys_rt_sigtimedwait & ia32_copy_siginfo_to_user.
                 */
                memset(&info, 0, sizeof(info));
        }
        set_fs (KERNEL_DS);
        ret = sys_rt_sigtimedwait(&s, uinfo ? &info : NULL, uts ? &t : NULL,
                        sigsetsize);
        set_fs (old_fs);
        if (ret >= 0 && uinfo) {
                if (ia32_copy_siginfo_to_user(uinfo, &info))
                        return -EFAULT;
        }
        return ret;
}

asmlinkage long
sys32_rt_sigqueueinfo(int pid, int sig, siginfo_t32 *uinfo)
{
        siginfo_t info;
        int ret;
        mm_segment_t old_fs = get_fs();
        
        if (ia32_copy_siginfo_from_user(&info, uinfo))
                return -EFAULT;
        set_fs (KERNEL_DS);
        ret = sys_rt_sigqueueinfo(pid, sig, &info);
        set_fs (old_fs);
        return ret;
}

/* These are here just in case some old ia32 binary calls it. */
asmlinkage long
sys32_pause(void)
{
        current->state = TASK_INTERRUPTIBLE;
        schedule();
        return -ERESTARTNOHAND;
}


struct sysctl_ia32 {
        unsigned int    name;
        int             nlen;
        unsigned int    oldval;
        unsigned int    oldlenp;
        unsigned int    newval;
        unsigned int    newlen;
        unsigned int    __unused[4];
};


asmlinkage long
sys32_sysctl(struct sysctl_ia32 *args32)
{
#ifndef CONFIG_SYSCTL
        return -ENOSYS; 
#else
        struct sysctl_ia32 a32;
        mm_segment_t old_fs = get_fs ();
        void *oldvalp, *newvalp;
        size_t oldlen;
        int *namep;
        long ret;
        extern int do_sysctl(int *name, int nlen, void *oldval, size_t *oldlenp,
                     void *newval, size_t newlen);


        if (copy_from_user(&a32, args32, sizeof (a32)))
                return -EFAULT;

        /*
         * We need to pre-validate these because we have to disable address checking
         * before calling do_sysctl() because of OLDLEN but we can't run the risk of the
         * user specifying bad addresses here.  Well, since we're dealing with 32 bit
         * addresses, we KNOW that access_ok() will always succeed, so this is an
         * expensive NOP, but so what...
         */
        namep = (int *) A(a32.name);
        oldvalp = (void *) A(a32.oldval);
        newvalp = (void *) A(a32.newval);

        if ((oldvalp && get_user(oldlen, (int *) A(a32.oldlenp)))
            || !access_ok(VERIFY_WRITE, namep, 0)
            || !access_ok(VERIFY_WRITE, oldvalp, 0)
            || !access_ok(VERIFY_WRITE, newvalp, 0))
                return -EFAULT;

        set_fs(KERNEL_DS);
        lock_kernel();
        ret = do_sysctl(namep, a32.nlen, oldvalp, &oldlen, newvalp, (size_t) a32.newlen);
        unlock_kernel();
        set_fs(old_fs);

        if (oldvalp && put_user (oldlen, (int *) A(a32.oldlenp)))
                return -EFAULT;

        return ret;
#endif
}

/* warning: next two assume little endian */ 
asmlinkage long
sys32_pread(unsigned int fd, char *ubuf, u32 count, u32 poslo, u32 poshi)
{
        return sys_pread64(fd, ubuf, count,
                         ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long
sys32_pwrite(unsigned int fd, char *ubuf, u32 count, u32 poslo, u32 poshi)
{
        return sys_pwrite64(fd, ubuf, count,
                          ((loff_t)AA(poshi) << 32) | AA(poslo));
}


asmlinkage long
sys32_personality(unsigned long personality)
{
        int ret;
        if (personality(current->personality) == PER_LINUX32 && 
                personality == PER_LINUX)
                personality = PER_LINUX32;
        ret = sys_personality(personality);
        if (ret == PER_LINUX32)
                ret = PER_LINUX;
        return ret;
}

asmlinkage long
sys32_sendfile(int out_fd, int in_fd, compat_off_t *offset, s32 count)
{
        mm_segment_t old_fs = get_fs();
        int ret;
        off_t of;
        
        if (offset && get_user(of, offset))
                return -EFAULT;
                
        set_fs(KERNEL_DS);
        ret = sys_sendfile(out_fd, in_fd, offset ? &of : NULL, count);
        set_fs(old_fs);
        
        if (!ret && offset && put_user(of, offset))
                return -EFAULT;
                
        return ret;
}

/* Handle adjtimex compatibility. */

struct timex32 {
        u32 modes;
        s32 offset, freq, maxerror, esterror;
        s32 status, constant, precision, tolerance;
        struct compat_timeval time;
        s32 tick;
        s32 ppsfreq, jitter, shift, stabil;
        s32 jitcnt, calcnt, errcnt, stbcnt;
        s32  :32; s32  :32; s32  :32; s32  :32;
        s32  :32; s32  :32; s32  :32; s32  :32;
        s32  :32; s32  :32; s32  :32; s32  :32;
};

extern int do_adjtimex(struct timex *);

asmlinkage long
sys32_adjtimex(struct timex32 *utp)
{
        struct timex txc;
        int ret;

        memset(&txc, 0, sizeof(struct timex));

        if(verify_area(VERIFY_READ, utp, sizeof(struct timex32)) ||
           __get_user(txc.modes, &utp->modes) ||
           __get_user(txc.offset, &utp->offset) ||
           __get_user(txc.freq, &utp->freq) ||
           __get_user(txc.maxerror, &utp->maxerror) ||
           __get_user(txc.esterror, &utp->esterror) ||
           __get_user(txc.status, &utp->status) ||
           __get_user(txc.constant, &utp->constant) ||
           __get_user(txc.precision, &utp->precision) ||
           __get_user(txc.tolerance, &utp->tolerance) ||
           __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
           __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
           __get_user(txc.tick, &utp->tick) ||
           __get_user(txc.ppsfreq, &utp->ppsfreq) ||
           __get_user(txc.jitter, &utp->jitter) ||
           __get_user(txc.shift, &utp->shift) ||
           __get_user(txc.stabil, &utp->stabil) ||
           __get_user(txc.jitcnt, &utp->jitcnt) ||
           __get_user(txc.calcnt, &utp->calcnt) ||
           __get_user(txc.errcnt, &utp->errcnt) ||
           __get_user(txc.stbcnt, &utp->stbcnt))
                return -EFAULT;

        ret = do_adjtimex(&txc);

        if(verify_area(VERIFY_WRITE, utp, sizeof(struct timex32)) ||
           __put_user(txc.modes, &utp->modes) ||
           __put_user(txc.offset, &utp->offset) ||
           __put_user(txc.freq, &utp->freq) ||
           __put_user(txc.maxerror, &utp->maxerror) ||
           __put_user(txc.esterror, &utp->esterror) ||
           __put_user(txc.status, &utp->status) ||
           __put_user(txc.constant, &utp->constant) ||
           __put_user(txc.precision, &utp->precision) ||
           __put_user(txc.tolerance, &utp->tolerance) ||
           __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
           __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
           __put_user(txc.tick, &utp->tick) ||
           __put_user(txc.ppsfreq, &utp->ppsfreq) ||
           __put_user(txc.jitter, &utp->jitter) ||
           __put_user(txc.shift, &utp->shift) ||
           __put_user(txc.stabil, &utp->stabil) ||
           __put_user(txc.jitcnt, &utp->jitcnt) ||
           __put_user(txc.calcnt, &utp->calcnt) ||
           __put_user(txc.errcnt, &utp->errcnt) ||
           __put_user(txc.stbcnt, &utp->stbcnt))
                ret = -EFAULT;

        return ret;
}

asmlinkage long sys32_mmap2(unsigned long addr, unsigned long len,
        unsigned long prot, unsigned long flags,
        unsigned long fd, unsigned long pgoff)
{
        struct mm_struct *mm = current->mm;
        unsigned long error;
        struct file * file = NULL;

        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
        if (!(flags & MAP_ANONYMOUS)) {
                file = fget(fd);
                if (!file)
                        return -EBADF;
        }

        if (prot & PROT_READ)
                prot |= vm_force_exec32;

        down_write(&mm->mmap_sem);
        error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
        up_write(&mm->mmap_sem);

        if (file)
                fput(file);
        return error;
}

asmlinkage long sys32_olduname(struct oldold_utsname * name)
{
        int error;
        struct new_utsname *ptr;

        if (!name)
                return -EFAULT;
        if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
                return -EFAULT;
  
        down_read(&uts_sem);
        
        ptr = vx_new_utsname();
        error = __copy_to_user(&name->sysname,ptr->sysname,__OLD_UTS_LEN);
         __put_user(0,name->sysname+__OLD_UTS_LEN);
         __copy_to_user(&name->nodename,ptr->nodename,__OLD_UTS_LEN);
         __put_user(0,name->nodename+__OLD_UTS_LEN);
         __copy_to_user(&name->release,ptr->release,__OLD_UTS_LEN);
         __put_user(0,name->release+__OLD_UTS_LEN);
         __copy_to_user(&name->version,ptr->version,__OLD_UTS_LEN);
         __put_user(0,name->version+__OLD_UTS_LEN);
         { 
                 char *arch = "x86_64";
                 if (personality(current->personality) == PER_LINUX32)
                         arch = "i686";
                 
                 __copy_to_user(&name->machine,arch,strlen(arch)+1);
         }
        
         up_read(&uts_sem);
         
         error = error ? -EFAULT : 0;
         
         return error;
}

long sys32_uname(struct old_utsname * name)
{
        int err;
        if (!name)
                return -EFAULT;
        down_read(&uts_sem);
        err=copy_to_user(name, vx_new_utsname(), sizeof (*name));
        up_read(&uts_sem);
        if (personality(current->personality) == PER_LINUX32) 
                err |= copy_to_user(&name->machine, "i686", 5);
        return err?-EFAULT:0;
}

long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
{
        struct ustat u;
        mm_segment_t seg;
        int ret;
        
        seg = get_fs(); 
        set_fs(KERNEL_DS); 
        ret = sys_ustat(dev,&u); 
        set_fs(seg);
        if (ret >= 0) { 
                if (!access_ok(VERIFY_WRITE,u32p,sizeof(struct ustat32)) || 
                    __put_user((__u32) u.f_tfree, &u32p->f_tfree) ||
                    __put_user((__u32) u.f_tinode, &u32p->f_tfree) ||
                    __copy_to_user(&u32p->f_fname, u.f_fname, sizeof(u.f_fname)) ||
                    __copy_to_user(&u32p->f_fpack, u.f_fpack, sizeof(u.f_fpack)))
                        ret = -EFAULT;
        }
        return ret;
} 

static int nargs(u32 src, char **dst) 
{ 
        int cnt;
        u32 val; 

        cnt = 0; 
        do {            
                int ret = get_user(val, (__u32 *)(u64)src); 
                if (ret)
                        return ret;
                if (dst)
                        dst[cnt] = (char *)(u64)val; 
                cnt++;
                src += 4;       
                if (cnt >= (MAX_ARG_PAGES*PAGE_SIZE)/sizeof(void*))
                        return -E2BIG; 
        } while(val); 
        if (dst)
                dst[cnt-1] = 0; 
        return cnt; 
} 

asmlinkage long sys32_execve(char *name, u32 argv, u32 envp, struct pt_regs regs)
{ 
        mm_segment_t oldseg; 
        char **buf = NULL; 
        int na = 0,ne = 0;
        int ret;
        unsigned sz = 0; 

        if (argv) {
        na = nargs(argv, NULL); 
        if (na < 0) 
                return -EFAULT; 
        }       
        if (envp) { 
        ne = nargs(envp, NULL); 
        if (ne < 0) 
                return -EFAULT; 
        }

        if (argv || envp) { 
        sz = (na+ne)*sizeof(void *); 
        if (sz > PAGE_SIZE) 
                buf = vmalloc(sz); 
        else
                buf = kmalloc(sz, GFP_KERNEL); 
        if (!buf)
                return -ENOMEM; 
        } 
        
        if (argv) { 
        ret = nargs(argv, buf);
        if (ret < 0)
                goto free;
        }

        if (envp) { 
        ret = nargs(envp, buf + na); 
        if (ret < 0)
                goto free; 
        }

        name = getname(name); 
        ret = PTR_ERR(name); 
        if (IS_ERR(name))
                goto free; 

        oldseg = get_fs(); 
        set_fs(KERNEL_DS);
        ret = do_execve(name, argv ? buf : NULL, envp ? buf+na : NULL, &regs);  
        set_fs(oldseg); 

        if (ret == 0)
                current->ptrace &= ~PT_DTRACE;

        putname(name);
 
free:
        if (argv || envp) { 
        if (sz > PAGE_SIZE)
                vfree(buf); 
        else
        kfree(buf);
        }
        return ret; 
} 

asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp, struct pt_regs regs)
{
        void *parent_tid = (void *)regs.rdx;
        void *child_tid = (void *)regs.rdi; 
        if (!newsp)
                newsp = regs.rsp;
        return do_fork(clone_flags & ~CLONE_IDLETASK, newsp, &regs, 0, 
                    parent_tid, child_tid);
}

/*
 * Some system calls that need sign extended arguments. This could be done by a generic wrapper.
 */ 

long sys32_lseek (unsigned int fd, int offset, unsigned int whence)
{
        return sys_lseek(fd, offset, whence);
}

long sys32_kill(int pid, int sig)
{
        return sys_kill(pid, sig);
}
 

#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
/* Stuff for NFS server syscalls... */
struct nfsctl_svc32 {
        u16                     svc32_port;
        s32                     svc32_nthreads;
};

struct nfsctl_client32 {
        s8                      cl32_ident[NFSCLNT_IDMAX+1];
        s32                     cl32_naddr;
        struct in_addr          cl32_addrlist[NFSCLNT_ADDRMAX];
        s32                     cl32_fhkeytype;
        s32                     cl32_fhkeylen;
        u8                      cl32_fhkey[NFSCLNT_KEYMAX];
};

struct nfsctl_export32 {
        s8                      ex32_client[NFSCLNT_IDMAX+1];
        s8                      ex32_path[NFS_MAXPATHLEN+1];
        compat_dev_t    ex32_dev;
        compat_ino_t    ex32_ino;
        s32                     ex32_flags;
        compat_pid_t    ex32_anon_uid;
        compat_gid_t    ex32_anon_gid;
};

struct nfsctl_fdparm32 {
        struct sockaddr         gd32_addr;
        s8                      gd32_path[NFS_MAXPATHLEN+1];
        s32                     gd32_version;
};

struct nfsctl_fsparm32 {
        struct sockaddr         gd32_addr;
        s8                      gd32_path[NFS_MAXPATHLEN+1];
        s32                     gd32_maxlen;
};

struct nfsctl_arg32 {
        s32                     ca32_version;   /* safeguard */
        union {
                struct nfsctl_svc32     u32_svc;
                struct nfsctl_client32  u32_client;
                struct nfsctl_export32  u32_export;
                struct nfsctl_fdparm32  u32_getfd;
                struct nfsctl_fsparm32  u32_getfs;
        } u;
#define ca32_svc        u.u32_svc
#define ca32_client     u.u32_client
#define ca32_export     u.u32_export
#define ca32_getfd      u.u32_getfd
#define ca32_getfs      u.u32_getfs
};

union nfsctl_res32 {
        __u8                    cr32_getfh[NFS_FHSIZE];
        struct knfsd_fh         cr32_getfs;
};

static int nfs_svc32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
        int err;
        
        err = get_user(karg->ca_version, &arg32->ca32_version);
        err |= __get_user(karg->ca_svc.svc_port, &arg32->ca32_svc.svc32_port);
        err |= __get_user(karg->ca_svc.svc_nthreads, &arg32->ca32_svc.svc32_nthreads);
        return err;
}

static int nfs_clnt32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
        int err;
        
        err = get_user(karg->ca_version, &arg32->ca32_version);
        err |= copy_from_user(&karg->ca_client.cl_ident[0],
                          &arg32->ca32_client.cl32_ident[0],
                          NFSCLNT_IDMAX);
        err |= __get_user(karg->ca_client.cl_naddr, &arg32->ca32_client.cl32_naddr);
        err |= copy_from_user(&karg->ca_client.cl_addrlist[0],
                          &arg32->ca32_client.cl32_addrlist[0],
                          (sizeof(struct in_addr) * NFSCLNT_ADDRMAX));
        err |= __get_user(karg->ca_client.cl_fhkeytype,
                      &arg32->ca32_client.cl32_fhkeytype);
        err |= __get_user(karg->ca_client.cl_fhkeylen,
                      &arg32->ca32_client.cl32_fhkeylen);
        err |= copy_from_user(&karg->ca_client.cl_fhkey[0],
                          &arg32->ca32_client.cl32_fhkey[0],
                          NFSCLNT_KEYMAX);
        return err;
}

static int nfs_exp32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
        int err;
        
        err = get_user(karg->ca_version, &arg32->ca32_version);
        err |= copy_from_user(&karg->ca_export.ex_client[0],
                          &arg32->ca32_export.ex32_client[0],
                          NFSCLNT_IDMAX);
        err |= copy_from_user(&karg->ca_export.ex_path[0],
                          &arg32->ca32_export.ex32_path[0],
                          NFS_MAXPATHLEN);
        err |= __get_user(karg->ca_export.ex_dev,
                      &arg32->ca32_export.ex32_dev);
        err |= __get_user(karg->ca_export.ex_ino,
                      &arg32->ca32_export.ex32_ino);
        err |= __get_user(karg->ca_export.ex_flags,
                      &arg32->ca32_export.ex32_flags);
        err |= __get_user(karg->ca_export.ex_anon_uid,
                      &arg32->ca32_export.ex32_anon_uid);
        err |= __get_user(karg->ca_export.ex_anon_gid,
                      &arg32->ca32_export.ex32_anon_gid);
        SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
        SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
        return err;
}


static int nfs_getfd32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
        int err;
        
        err = get_user(karg->ca_version, &arg32->ca32_version);
        err |= copy_from_user(&karg->ca_getfd.gd_addr,
                          &arg32->ca32_getfd.gd32_addr,
                          (sizeof(struct sockaddr)));
        err |= copy_from_user(&karg->ca_getfd.gd_path,
                          &arg32->ca32_getfd.gd32_path,
                          (NFS_MAXPATHLEN+1));
        err |= get_user(karg->ca_getfd.gd_version,
                      &arg32->ca32_getfd.gd32_version);
        return err;
}

static int nfs_getfs32_trans(struct nfsctl_arg *karg, struct nfsctl_arg32 *arg32)
{
        int err;
        
        err = get_user(karg->ca_version, &arg32->ca32_version);
        err |= copy_from_user(&karg->ca_getfs.gd_addr,
                          &arg32->ca32_getfs.gd32_addr,
                          (sizeof(struct sockaddr)));
        err |= copy_from_user(&karg->ca_getfs.gd_path,
                          &arg32->ca32_getfs.gd32_path,
                          (NFS_MAXPATHLEN+1));
        err |= get_user(karg->ca_getfs.gd_maxlen,
                      &arg32->ca32_getfs.gd32_maxlen);
        return err;
}

/* This really doesn't need translations, we are only passing
 * back a union which contains opaque nfs file handle data.
 */
static int nfs_getfh32_res_trans(union nfsctl_res *kres, union nfsctl_res32 *res32)
{
        return copy_to_user(res32, kres, sizeof(*res32)) ? -EFAULT : 0;
}

long asmlinkage sys32_nfsservctl(int cmd, struct nfsctl_arg32 *arg32, union nfsctl_res32 *res32)
{
        struct nfsctl_arg *karg = NULL;
        union nfsctl_res *kres = NULL;
        mm_segment_t oldfs;
        int err;

        karg = kmalloc(sizeof(*karg), GFP_USER);
        if(!karg)
                return -ENOMEM;
        if(res32) {
                kres = kmalloc(sizeof(*kres), GFP_USER);
                if(!kres) {
                        kfree(karg);
                        return -ENOMEM;
                }
        }
        switch(cmd) {
        case NFSCTL_SVC:
                err = nfs_svc32_trans(karg, arg32);
                break;
        case NFSCTL_ADDCLIENT:
                err = nfs_clnt32_trans(karg, arg32);
                break;
        case NFSCTL_DELCLIENT:
                err = nfs_clnt32_trans(karg, arg32);
                break;
        case NFSCTL_EXPORT:
        case NFSCTL_UNEXPORT:
                err = nfs_exp32_trans(karg, arg32);
                break;
        case NFSCTL_GETFD:
                err = nfs_getfd32_trans(karg, arg32);
                break;
        case NFSCTL_GETFS:
                err = nfs_getfs32_trans(karg, arg32);
                break;
        default:
                err = -EINVAL;
                break;
        }
        if(err)
                goto done;
        oldfs = get_fs();
        set_fs(KERNEL_DS);
        err = sys_nfsservctl(cmd, karg, kres);
        set_fs(oldfs);

        if (err)
                goto done;

        if((cmd == NFSCTL_GETFD) ||
           (cmd == NFSCTL_GETFS))
                err = nfs_getfh32_res_trans(kres, res32);

done:
        if(karg)
                kfree(karg);
        if(kres)
                kfree(kres);
        return err;
}
#else /* !NFSD */
long asmlinkage sys32_nfsservctl(int cmd, void *notused, void *notused2)
{
        return sys_ni_syscall();
}
#endif

long sys32_io_setup(unsigned nr_reqs, u32 *ctx32p)
{ 
        long ret; 
        aio_context_t ctx64;
        mm_segment_t oldfs = get_fs();  
        set_fs(KERNEL_DS); 
        ret = sys_io_setup(nr_reqs, &ctx64); 
        set_fs(oldfs); 
        /* truncating is ok because it's a user address */
        if (!ret) 
                ret = put_user((u32)ctx64, ctx32p);
        return ret;
} 

asmlinkage long sys32_io_submit(aio_context_t ctx_id, int nr,
                   compat_uptr_t *iocbpp)
{
        struct kioctx *ctx;
        long ret = 0;
        int i;
        
        if (unlikely(nr < 0))
                return -EINVAL;

        if (unlikely(!access_ok(VERIFY_READ, iocbpp, (nr*sizeof(*iocbpp)))))
                return -EFAULT;

        ctx = lookup_ioctx(ctx_id);
        if (unlikely(!ctx)) {
                pr_debug("EINVAL: io_submit: invalid context id\n");
                return -EINVAL; 
        } 

        for (i=0; i<nr; i++) {
                compat_uptr_t p32;
                struct iocb *user_iocb, tmp;

                if (unlikely(__get_user(p32, iocbpp + i))) {
                        ret = -EFAULT;
                        break;
                } 
                user_iocb = compat_ptr(p32);

                if (unlikely(copy_from_user(&tmp, user_iocb, sizeof(tmp)))) {
                        ret = -EFAULT;
                        break;
                }

                ret = io_submit_one(ctx, user_iocb, &tmp);
                if (ret)
                        break;
        }

        put_ioctx(ctx);
        return i ? i : ret;
}


asmlinkage long sys32_io_getevents(aio_context_t ctx_id,
                                 unsigned long min_nr,
                                 unsigned long nr,
                                 struct io_event *events,
                                 struct compat_timespec *timeout)
{       
        long ret;
        mm_segment_t oldfs; 
        struct timespec t;
        /* Harden against bogus ptrace */
        if (nr >= 0xffffffff || 
            !access_ok(VERIFY_WRITE, events, nr * sizeof(struct io_event)))
                return -EFAULT;
        if (timeout && get_compat_timespec(&t, timeout))
                return -EFAULT; 
        oldfs = get_fs();
        set_fs(KERNEL_DS); 
        ret = sys_io_getevents(ctx_id,min_nr,nr,events,timeout ? &t : NULL); 
        set_fs(oldfs); 
        if (!ret && timeout && put_compat_timespec(&t, timeout))
                return -EFAULT;                 
        return ret;
} 

asmlinkage long sys32_open(const char * filename, int flags, int mode)
{
        char * tmp;
        int fd, error;

        /* don't force O_LARGEFILE */
        tmp = getname(filename);
        fd = PTR_ERR(tmp);
        if (!IS_ERR(tmp)) {
                fd = get_unused_fd();
                if (fd >= 0) {
                        struct file *f = filp_open(tmp, flags, mode);
                        error = PTR_ERR(f);
                        if (unlikely(IS_ERR(f))) {
                                put_unused_fd(fd); 
                                fd = error;
                        } else
                                fd_install(fd, f);
                }
                putname(tmp);
        }
        return fd;
}

struct sigevent32 { 
        u32 sigev_value;
        u32 sigev_signo; 
        u32 sigev_notify; 
        u32 payload[(64 / 4) - 3]; 
}; 

extern asmlinkage long
sys_timer_create(clockid_t which_clock,
                 struct sigevent __user *timer_event_spec,
                 timer_t __user * created_timer_id);

long
sys32_timer_create(u32 clock, struct sigevent32 *se32, timer_t *timer_id)
{
        struct sigevent se;
       mm_segment_t oldfs;
       long err;

        if (se32) { 
                memset(&se, 0, sizeof(struct sigevent)); 
                if (get_user(se.sigev_value.sival_int,  &se32->sigev_value) ||
                    __get_user(se.sigev_signo, &se32->sigev_signo) ||
                    __get_user(se.sigev_notify, &se32->sigev_notify) ||
                    __copy_from_user(&se._sigev_un._pad, &se32->payload, 
                                     sizeof(se32->payload)))
                        return -EFAULT;
        } 
        if (!access_ok(VERIFY_WRITE,timer_id,sizeof(timer_t)))
                return -EFAULT;

       oldfs = get_fs();
        set_fs(KERNEL_DS);
       err = sys_timer_create(clock, se32 ? &se : NULL, timer_id);
        set_fs(oldfs); 
        
        return err; 
} 

long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high, 
                        __u32 len_low, __u32 len_high, int advice)
{ 
        return sys_fadvise64_64(fd,
                               (((u64)offset_high)<<32) | offset_low,
                               (((u64)len_high)<<32) | len_low,
                               advice); 
} 

long sys32_vm86_warning(void)
{ 
        struct task_struct *me = current;
        static char lastcomm[8];
        if (strcmp(lastcomm, me->comm)) {
                printk(KERN_INFO "%s: vm86 mode not supported on 64 bit kernel\n",
                       me->comm);
                strcpy(lastcomm, me->comm); 
        } 
        return -ENOSYS;
} 

long sys32_quotactl(void)
{ 
        struct task_struct *me = current;
        static char lastcomm[8];
        if (strcmp(lastcomm, me->comm)) {
                printk(KERN_INFO "%s: 32bit quotactl not supported on 64 bit kernel\n",
                       me->comm);
                strcpy(lastcomm, me->comm); 
        } 
        return -ENOSYS;
} 

cond_syscall(sys32_ipc)

static int __init ia32_init (void)
{
        printk("IA32 emulation $Id: sys_ia32.c,v 1.32 2002/03/24 13:02:28 ak Exp $\n");  
        return 0;
}

__initcall(ia32_init);

extern unsigned long ia32_sys_call_table[];
EXPORT_SYMBOL(ia32_sys_call_table);