/*
 * 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.
 *
 * $Id: sys_ia32.c,v 1.70 2004/03/03 23:36:43 ak Exp $
 */

#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/utime.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/smb_fs.h>
#include <linux/smb_mount.h>
#include <linux/ncp_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/highuid.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)))

#undef high2lowuid
#undef high2lowgid
#undef low2highuid
#undef low2highgid

#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
extern int overflowuid,overflowgid; 

typedef u16 old_uid_t;
typedef u16 old_gid_t;

#include "../../../kernel/uid16.c" 

static int
putstat(struct stat32 *ubuf, struct stat *kbuf)
{
        if (kbuf->st_size > 0x7fffffff)
                return -EOVERFLOW;
        if (verify_area(VERIFY_WRITE, ubuf, sizeof(struct stat32)) ||
            __put_user (kbuf->st_dev, &ubuf->st_dev) ||
            __put_user (kbuf->st_ino, &ubuf->st_ino) ||
            __put_user (kbuf->st_mode, &ubuf->st_mode) ||
            __put_user (kbuf->st_nlink, &ubuf->st_nlink) ||
            __put_user (high2lowuid(kbuf->st_uid), &ubuf->st_uid) ||
            __put_user (high2lowgid(kbuf->st_gid), &ubuf->st_gid) ||
            __put_user (kbuf->st_rdev, &ubuf->st_rdev) ||
            __put_user (kbuf->st_size, &ubuf->st_size) ||
            __put_user (kbuf->st_atime, &ubuf->st_atime) ||
            __put_user (kbuf->st_mtime, &ubuf->st_mtime) ||
            __put_user (kbuf->st_ctime, &ubuf->st_ctime) ||
            __put_user (kbuf->st_blksize, &ubuf->st_blksize) ||
            __put_user (kbuf->st_blocks, &ubuf->st_blocks))
                return -EFAULT;
        return 0;
}

extern asmlinkage long sys_newstat(char * filename, struct stat * statbuf);

asmlinkage long
sys32_newstat(char * filename, struct stat32 *statbuf)
{
        char *name;
        int ret;
        struct stat s;
        mm_segment_t old_fs = get_fs();
        
        name = getname(filename);
        if (IS_ERR(name))
                return PTR_ERR(name);
        set_fs (KERNEL_DS);
        ret = sys_newstat(name, &s);
        set_fs (old_fs);
        putname(name);
        if (ret)
        return ret;
        return putstat(statbuf, &s);
}

extern asmlinkage long sys_newlstat(char * filename, struct stat * statbuf);

asmlinkage long
sys32_newlstat(char * filename, struct stat32 *statbuf)
{
        char *name;
        int ret;
        struct stat s;
        mm_segment_t old_fs = get_fs();
        
        name = getname(filename);
        if (IS_ERR(name))
                return PTR_ERR(name);
        set_fs (KERNEL_DS);
        ret = sys_newlstat(name, &s);
        set_fs (old_fs);
        putname(name);
        if (ret) 
        return ret;
        return putstat(statbuf, &s);
}

extern asmlinkage long sys_newfstat(unsigned int fd, struct stat * statbuf);

asmlinkage long
sys32_newfstat(unsigned int fd, struct stat32 *statbuf)
{
        int ret;
        struct stat s;
        mm_segment_t old_fs = get_fs();
        
        set_fs (KERNEL_DS);
        ret = sys_newfstat(fd, &s);
        set_fs (old_fs);
        if (ret)
        return ret;
        return putstat(statbuf, &s);
}

extern long sys_truncate(char *, loff_t); 

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);
}

extern long sys_ftruncate(int, loff_t); 

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
putstat64(struct stat64 *ubuf, struct stat *kbuf)
{
        if (verify_area(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
            __put_user (kbuf->st_dev, &ubuf->st_dev) ||
            __put_user (kbuf->st_ino, &ubuf->__st_ino) ||
            __put_user (kbuf->st_ino, &ubuf->st_ino) ||
            __put_user (kbuf->st_mode, &ubuf->st_mode) ||
            __put_user (kbuf->st_nlink, &ubuf->st_nlink) ||
            __put_user (kbuf->st_uid, &ubuf->st_uid) ||
            __put_user (kbuf->st_gid, &ubuf->st_gid) ||
            __put_user (kbuf->st_rdev, &ubuf->st_rdev) ||
            __put_user (kbuf->st_size, &ubuf->st_size) ||
            __put_user (kbuf->st_atime, &ubuf->st_atime) ||
            __put_user (kbuf->st_mtime, &ubuf->st_mtime) ||
            __put_user (kbuf->st_ctime, &ubuf->st_ctime) ||
            __put_user (kbuf->st_blksize, &ubuf->st_blksize) ||
            __put_user (kbuf->st_blocks, &ubuf->st_blocks))
                return -EFAULT;
        return 0;
}

asmlinkage long
sys32_stat64(char * filename, struct stat64 *statbuf)
{
        char *name;
        int ret;
        struct stat s;
        mm_segment_t old_fs = get_fs();
        
        name = getname(filename);
        if (IS_ERR(name))
                return PTR_ERR(name);   
        set_fs (KERNEL_DS);
        ret = sys_newstat(name, &s);
        set_fs (old_fs);
        putname(name);
        if (ret)
        return ret;
        return putstat64(statbuf, &s);
}

asmlinkage long
sys32_lstat64(char * filename, struct stat64 *statbuf)
{
        char *name;
        int ret;
        struct stat s;
        mm_segment_t old_fs = get_fs();
        
        name = getname(filename);
        if (IS_ERR(name))
                return PTR_ERR(name);
        set_fs (KERNEL_DS);
        ret = sys_newlstat(name, &s);
        set_fs (old_fs);
        putname(name); 
        if (ret)
        return ret;
        return putstat64(statbuf, &s);
}

asmlinkage long
sys32_fstat64(unsigned int fd, struct stat64 *statbuf)
{
        int ret;
        struct stat s;
        mm_segment_t old_fs = get_fs();
        
        set_fs (KERNEL_DS);
        ret = sys_newfstat(fd, &s);
        set_fs (old_fs);
        if (ret)
        return ret;
        return putstat64(statbuf, &s);
}

/* Don't set O_LARGEFILE implicitely. */
asmlinkage long sys32_open(const char * filename, int flags, int mode)
{
        char * tmp;
        int fd, error;

        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 (IS_ERR(f))
                                goto out_error;
                        fd_install(fd, f);
                }
out:
                putname(tmp);
        }
        return fd;

out_error:
        put_unused_fd(fd);
        fd = error;
        goto out;
}

/*
 * 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 |= PROT_EXEC; 

        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;
}

extern asmlinkage long sys_mprotect(unsigned long start,size_t len,unsigned long prot);

asmlinkage long sys32_mprotect(unsigned long start, size_t len, unsigned long prot)
{
        if (prot & PROT_READ) 
                prot |= PROT_EXEC; 
        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;
        sigset32_t set32;

        /* XXX: Don't preclude handling different sized sigset_t's.  */
        if (sigsetsize != sizeof(sigset32_t))
                return -EINVAL;

        if (act) {
                u32 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(sigset32_t)))
                        return -EFAULT;
                new_ka.sa.sa_handler = (void*)(u64)handler;
                new_ka.sa.sa_restorer = (void*)(u64)restorer;

                /* FIXME: here we rely on _IA32_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 _IA32_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(sigset32_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) {
                old_sigset32_t mask;
                u32 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 = (void*)(u64)handler;
                new_ka.sa.sa_restorer = (void*)(u64)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;
}

extern asmlinkage long sys_rt_sigprocmask(int how, sigset_t *set, sigset_t *oset,
                                          size_t sigsetsize);

asmlinkage long
sys32_rt_sigprocmask(int how, sigset32_t *set, sigset32_t *oset,
                     unsigned int sigsetsize)
{
        sigset_t s;
        sigset32_t s32;
        int ret;
        mm_segment_t old_fs = get_fs();
        
        if (set) {
                if (copy_from_user (&s32, set, sizeof(sigset32_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(sigset32_t)))
                        return -EFAULT;
        }
        return 0;
}

static int
put_statfs (struct statfs32 *ubuf, struct statfs *kbuf)
{
        if (verify_area(VERIFY_WRITE, ubuf, sizeof(struct statfs32)) ||
            __put_user (kbuf->f_type, &ubuf->f_type) ||
            __put_user (kbuf->f_bsize, &ubuf->f_bsize) ||
            __put_user (kbuf->f_blocks, &ubuf->f_blocks) ||
            __put_user (kbuf->f_bfree, &ubuf->f_bfree) ||
            __put_user (kbuf->f_bavail, &ubuf->f_bavail) ||
            __put_user (kbuf->f_files, &ubuf->f_files) ||
            __put_user (kbuf->f_ffree, &ubuf->f_ffree) ||
            __put_user (kbuf->f_namelen, &ubuf->f_namelen) ||
            __put_user (kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
            __put_user (kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
            __put_user (0, &ubuf->f_spare[0]) ||
            __put_user (0, &ubuf->f_spare[1]) ||
            __put_user (0, &ubuf->f_spare[2]) ||
            __put_user (0, &ubuf->f_spare[3]) ||
            __put_user (0, &ubuf->f_spare[4]) ||
            __put_user (0, &ubuf->f_spare[5]))
                return -EFAULT;
        return 0;
}

extern asmlinkage long sys_statfs(const char * path, struct statfs * buf);

asmlinkage long
sys32_statfs(const char * path, struct statfs32 *buf)
{
        int ret;
        struct statfs s;
        mm_segment_t old_fs = get_fs();
        const char *name;
        
        name = getname(path);
        if (IS_ERR(name))
                return PTR_ERR(name);
        set_fs (KERNEL_DS);
        ret = sys_statfs(name, &s);
        set_fs (old_fs);
        putname(name);
        if (put_statfs(buf, &s))
                return -EFAULT;
        return ret;
}

extern asmlinkage long sys_fstatfs(unsigned int fd, struct statfs * buf);

asmlinkage long
sys32_fstatfs(unsigned int fd, struct statfs32 *buf)
{
        int ret;
        struct statfs s;
        mm_segment_t old_fs = get_fs();
        
        set_fs (KERNEL_DS);
        ret = sys_fstatfs(fd, &s);
        set_fs (old_fs);
        if (put_statfs(buf, &s))
                return -EFAULT;
        return ret;
}

struct timeval32
{
    int tv_sec, tv_usec;
};

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

static long
get_tv32(struct timeval *o, struct timeval32 *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 long
put_tv32(struct timeval32 *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; 
}

static long
get_it32(struct itimerval *o, struct itimerval32 *i)
{
        int err = -EFAULT; 
        if (access_ok(VERIFY_READ, i, sizeof(*i))) { 
                err = __get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec);
                err |= __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec);
                err |= __get_user(o->it_value.tv_sec, &i->it_value.tv_sec);
                err |= __get_user(o->it_value.tv_usec, &i->it_value.tv_usec);
        }
        return err;
}

static long
put_it32(struct itimerval32 *o, struct itimerval *i)
{
        int err = -EFAULT;
        if (access_ok(VERIFY_WRITE, o, sizeof(*o))) {
                err = __put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec);
                err |= __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec);
                err |= __put_user(i->it_value.tv_sec, &o->it_value.tv_sec);
                err |= __put_user(i->it_value.tv_usec, &o->it_value.tv_usec); 
        } 
        return err;
}

extern int do_getitimer(int which, struct itimerval *value);

asmlinkage long
sys32_getitimer(int which, struct itimerval32 *it)
{
        struct itimerval kit;
        int error;

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

        return error;
}

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

asmlinkage long
sys32_setitimer(int which, struct itimerval32 *in, struct itimerval32 *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;

}

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.  */

struct utimbuf_32 {
        int     atime;
        int     mtime;
};

extern asmlinkage long sys_utimes(char * filename, struct timeval * utimes);
extern asmlinkage long sys_gettimeofday (struct timeval *tv, struct timezone *tz);

extern struct timezone sys_tz;
extern int do_sys_settimeofday(struct timeval *tv, struct timezone *tz);

asmlinkage long
sys32_gettimeofday(struct timeval32 *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 timeval32 *tv, struct timezone *tz)
{
        struct timeval ktv;
        struct timezone ktz;

        if (tv) {
                if (get_tv32(&ktv, tv))
                        return -EFAULT;
        }
        if (tz) {
                if (copy_from_user(&ktz, tz, sizeof(ktz)))
                        return -EFAULT;
        }

        return do_sys_settimeofday(tv ? &ktv : 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 + 1, 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);
        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 timeval32 *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;
        size = FDS_BYTES(n);

        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;
        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 timeval32 *)A(a.tvp));
}

extern asmlinkage long sys_nanosleep(struct timespec *rqtp, struct timespec *rmtp); 

asmlinkage long
sys32_nanosleep(struct timespec32 *rqtp, struct timespec32 *rmtp)
{
        struct timespec t, tout;
        int ret;
        mm_segment_t old_fs = get_fs ();
        
        if (rqtp) { 
        if (verify_area(VERIFY_READ, rqtp, sizeof(struct timespec32)) ||
            __get_user (t.tv_sec, &rqtp->tv_sec) ||

            __get_user (t.tv_nsec, &rqtp->tv_nsec))
                return -EFAULT;
        }
        set_fs (KERNEL_DS);
        ret = sys_nanosleep(rqtp ? &t : NULL, rmtp ? &tout : NULL);
        set_fs (old_fs);
        if (rmtp && ret == -EINTR) {
                if (verify_area(VERIFY_WRITE, rmtp, sizeof(struct timespec32)) ||
                    __put_user (tout.tv_sec, &rmtp->tv_sec) ||
                    __put_user (tout.tv_nsec, &rmtp->tv_nsec))
                        return -EFAULT;
        }
        return ret;
}

asmlinkage ssize_t sys_readv(unsigned long,const struct iovec *,unsigned long);
asmlinkage ssize_t sys_writev(unsigned long,const struct iovec *,unsigned long);

static struct iovec *
get_iovec32(struct iovec32 *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 iovec32)**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 iovec32 *vector, u32 count)
{
        struct iovec iovstack[UIO_FASTIOV];
        struct iovec *iov;
        int ret;
        mm_segment_t old_fs = get_fs();

        if ((iov = get_iovec32(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 iovec32 *vector, u32 count)
{
        struct iovec iovstack[UIO_FASTIOV];
        struct iovec *iov;
        int ret;
        mm_segment_t old_fs = get_fs();

        if ((iov = get_iovec32(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;
}

#define RLIM_INFINITY32 0xffffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

struct rlimit32 {
        unsigned        rlim_cur;
        unsigned        rlim_max;
};

extern asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit *rlim);

asmlinkage long
sys32_getrlimit(unsigned int resource, struct rlimit32 *rlim)
{
        struct rlimit r;
        int ret;
        mm_segment_t old_fs;

        old_fs = get_fs();
        set_fs(KERNEL_DS);
        ret = sys_getrlimit(resource, &r);
        set_fs(old_fs);
        if (!ret) {
                if (r.rlim_cur >= 0xffffffff) 
                        r.rlim_cur = RLIM_INFINITY32;
                if (r.rlim_max >= 0xffffffff) 
                        r.rlim_max = RLIM_INFINITY32;
                if (verify_area(VERIFY_WRITE, rlim, sizeof(struct rlimit32)) ||
                    __put_user(RESOURCE32(r.rlim_cur), &rlim->rlim_cur) ||
                    __put_user(RESOURCE32(r.rlim_max), &rlim->rlim_max))
                        ret = -EFAULT;
        }
        return ret;
}

extern asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit *rlim);

asmlinkage long
sys32_old_getrlimit(unsigned int resource, struct rlimit32 *rlim)
{
        struct rlimit r;
        int ret;
        mm_segment_t old_fs;
        
        old_fs = get_fs();
        set_fs(KERNEL_DS);
        ret = sys_getrlimit(resource, &r);
        set_fs(old_fs);
        if (!ret) {
                if (r.rlim_cur >= 0x7fffffff) 
                        r.rlim_cur = RLIM_INFINITY32;
                if (r.rlim_max >= 0x7fffffff) 
                        r.rlim_max = RLIM_INFINITY32;   
                if (verify_area(VERIFY_WRITE, rlim, sizeof(struct rlimit32)) ||
                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
                    __put_user(r.rlim_max, &rlim->rlim_max))
                        ret = -EFAULT;
        }
        return ret;
}

extern asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit *rlim);

asmlinkage long
sys32_setrlimit(unsigned int resource, struct rlimit32 *rlim)
{
        struct rlimit r;
        int ret;
        mm_segment_t old_fs = get_fs ();

        if (resource >= RLIM_NLIMITS) return -EINVAL;   
        if (verify_area(VERIFY_READ, rlim, sizeof(struct rlimit32)) ||
            __get_user (r.rlim_cur, &rlim->rlim_cur) ||
            __get_user (r.rlim_max, &rlim->rlim_max))
                return -EFAULT;
        if (r.rlim_cur == RLIM_INFINITY32)
                r.rlim_cur = RLIM_INFINITY;
        if (r.rlim_max == RLIM_INFINITY32)
                r.rlim_max = RLIM_INFINITY;
        set_fs (KERNEL_DS);
        ret = sys_setrlimit(resource, &r);
        set_fs (old_fs);
        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;

        /* SMP: This is fairly trivial. We grab CURRENT_TIME and 
           stuff it to user space. No side effects */
        i = CURRENT_TIME;
        if (tloc) {
                if (put_user(i,tloc))
                        i = -EFAULT;
        }
        return i;
}

struct rusage32 {
        struct timeval32 ru_utime;
        struct timeval32 ru_stime;
        int    ru_maxrss;
        int    ru_ixrss;
        int    ru_idrss;
        int    ru_isrss;
        int    ru_minflt;
        int    ru_majflt;
        int    ru_nswap;
        int    ru_inblock;
        int    ru_oublock;
        int    ru_msgsnd; 
        int    ru_msgrcv; 
        int    ru_nsignals;
        int    ru_nvcsw;
        int    ru_nivcsw;
};

static int
put_rusage (struct rusage32 *ru, struct rusage *r)
{
        if (verify_area(VERIFY_WRITE, ru, sizeof(struct rusage32)) ||
            __put_user (r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
            __put_user (r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
            __put_user (r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
            __put_user (r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
            __put_user (r->ru_maxrss, &ru->ru_maxrss) ||
            __put_user (r->ru_ixrss, &ru->ru_ixrss) ||
            __put_user (r->ru_idrss, &ru->ru_idrss) ||
            __put_user (r->ru_isrss, &ru->ru_isrss) ||
            __put_user (r->ru_minflt, &ru->ru_minflt) ||
            __put_user (r->ru_majflt, &ru->ru_majflt) ||
            __put_user (r->ru_nswap, &ru->ru_nswap) ||
            __put_user (r->ru_inblock, &ru->ru_inblock) ||
            __put_user (r->ru_oublock, &ru->ru_oublock) ||
            __put_user (r->ru_msgsnd, &ru->ru_msgsnd) ||
            __put_user (r->ru_msgrcv, &ru->ru_msgrcv) ||
            __put_user (r->ru_nsignals, &ru->ru_nsignals) ||
            __put_user (r->ru_nvcsw, &ru->ru_nvcsw) ||
            __put_user (r->ru_nivcsw, &ru->ru_nivcsw))
                return -EFAULT;
        return 0;
}

extern asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr,
                                int options, struct rusage * ru);

asmlinkage long
sys32_wait4(__kernel_pid_t32 pid, unsigned int *stat_addr, int options,
            struct rusage32 *ru)
{
        if (!ru)
                return sys_wait4(pid, stat_addr, options, NULL);
        else {
                struct rusage r;
                int ret;
                unsigned int status;
                mm_segment_t old_fs = get_fs();
                
                set_fs (KERNEL_DS);
                ret = sys_wait4(pid, stat_addr ? &status : NULL, options, &r);
                set_fs (old_fs);
                if (put_rusage (ru, &r)) return -EFAULT;
                if (stat_addr && put_user (status, stat_addr))
                        return -EFAULT;
                return ret;
        }
}

asmlinkage long
sys32_waitpid(__kernel_pid_t32 pid, unsigned int *stat_addr, int options)
{
        return sys32_wait4(pid, stat_addr, options, NULL);
}

extern asmlinkage long
sys_getrusage(int who, struct rusage *ru);

asmlinkage long
sys32_getrusage(int who, struct rusage32 *ru)
{
        struct rusage r;
        int ret;
        mm_segment_t old_fs = get_fs();
                
        set_fs (KERNEL_DS);
        ret = sys_getrusage(who, &r);
        set_fs (old_fs);
        if (put_rusage (ru, &r)) return -EFAULT;
        return ret;
}

struct tms32 {
        __kernel_clock_t32 tms_utime;
        __kernel_clock_t32 tms_stime;
        __kernel_clock_t32 tms_cutime;
        __kernel_clock_t32 tms_cstime;
};

extern int sys_times(struct tms *);
                               
asmlinkage long
sys32_times(struct tms32 *tbuf)
{
        struct tms t;
        long ret;
        mm_segment_t old_fs = get_fs ();
        
        set_fs (KERNEL_DS);
        ret = sys_times(tbuf ? &t : NULL);
        set_fs (old_fs);
        if (tbuf) {
                if (verify_area(VERIFY_WRITE, tbuf, sizeof(struct tms32)) ||
                    __put_user (t.tms_utime, &tbuf->tms_utime) ||
                    __put_user (t.tms_stime, &tbuf->tms_stime) ||
                    __put_user (t.tms_cutime, &tbuf->tms_cutime) ||
                    __put_user (t.tms_cstime, &tbuf->tms_cstime))
                        return -EFAULT;
        }
        return ret;
}


static inline int get_flock(struct flock *kfl, struct flock32 *ufl)
{
        int err;
        
        err = get_user(kfl->l_type, &ufl->l_type);
        err |= __get_user(kfl->l_whence, &ufl->l_whence);
        err |= __get_user(kfl->l_start, &ufl->l_start);
        err |= __get_user(kfl->l_len, &ufl->l_len);
        err |= __get_user(kfl->l_pid, &ufl->l_pid);
        return err;
}

static inline int put_flock(struct flock *kfl, struct flock32 *ufl)
{
        int err;
        
        err = __put_user(kfl->l_type, &ufl->l_type);
        err |= __put_user(kfl->l_whence, &ufl->l_whence);
        err |= __put_user(kfl->l_start, &ufl->l_start);
        err |= __put_user(kfl->l_len, &ufl->l_len);
        err |= __put_user(kfl->l_pid, &ufl->l_pid);
        return err;
}

extern asmlinkage long sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg);
asmlinkage long sys32_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg);


asmlinkage long sys32_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
        switch (cmd) {
        case F_GETLK:
        case F_SETLK:
        case F_SETLKW:
                {
                        struct flock f;
                        mm_segment_t old_fs;
                        long ret;
                        
                        if (get_flock(&f, (struct flock32 *)arg))
                                return -EFAULT;
                        old_fs = get_fs(); set_fs (KERNEL_DS);
                        ret = sys_fcntl(fd, cmd, (unsigned long)&f);
                        set_fs (old_fs);
                        if (ret) return ret;
                        if (put_flock(&f, (struct flock32 *)arg))
                                return -EFAULT;
                        return 0;
                }
        case F_GETLK64: 
        case F_SETLK64: 
        case F_SETLKW64: 
                return sys32_fcntl64(fd,cmd,arg); 

        default:
                return sys_fcntl(fd, cmd, (unsigned long)arg);
        }
}

static inline int get_flock64(struct ia32_flock64 *fl32, struct flock *fl64)
{
        if (access_ok(fl32, sizeof(struct ia32_flock64), VERIFY_WRITE)) {
                int ret = __get_user(fl64->l_type, &fl32->l_type); 
                ret |= __get_user(fl64->l_whence, &fl32->l_whence);
                ret |= __get_user(fl64->l_start, &fl32->l_start); 
                ret |= __get_user(fl64->l_len, &fl32->l_len); 
                ret |= __get_user(fl64->l_pid, &fl32->l_pid); 
                return ret; 
        }
        return -EFAULT; 
}

static inline int put_flock64(struct ia32_flock64 *fl32, struct flock *fl64)
{
        if (access_ok(fl32, sizeof(struct ia32_flock64), VERIFY_WRITE)) {
                int ret = __put_user(fl64->l_type, &fl32->l_type); 
                ret |= __put_user(fl64->l_whence, &fl32->l_whence);
                ret |= __put_user(fl64->l_start, &fl32->l_start); 
                ret |= __put_user(fl64->l_len, &fl32->l_len); 
                ret |= __put_user(fl64->l_pid, &fl32->l_pid); 
                return ret; 
        }
        return -EFAULT; 
}

asmlinkage long sys32_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
{
        struct flock fl64;  
        mm_segment_t oldfs = get_fs(); 
        int ret = 0; 
        int oldcmd = cmd;
        unsigned long oldarg = arg;

        switch (cmd) {
        case F_GETLK64: 
                cmd = F_GETLK; 
                goto cnv;
        case F_SETLK64: 
                cmd = F_SETLK; 
                goto cnv; 
        case F_SETLKW64:
                cmd = F_SETLKW; 
        cnv:
                ret = get_flock64((struct ia32_flock64 *)arg, &fl64); 
                arg = (unsigned long)&fl64; 
                set_fs(KERNEL_DS); 
                break; 
        case F_GETLK:
        case F_SETLK:
        case F_SETLKW:
                return sys32_fcntl(fd,cmd,arg); 
        }
        if (!ret)
                ret = sys_fcntl(fd, cmd, arg);
        set_fs(oldfs); 
        if (oldcmd == F_GETLK64 && !ret)
                ret = put_flock64((struct ia32_flock64 *)oldarg, &fl64); 
        return ret; 
}

asmlinkage long sys32_ni_syscall(int call)
{ 
        /* Disable for now because the emulation should be pretty complete 
           and we miss some syscalls from 2.6. */
#if 0
        printk(KERN_INFO "IA32 syscall %d from %s not implemented\n", call,
               current->comm);
#endif             
        return -ENOSYS;        
} 

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

extern asmlinkage long sys_utime(char * filename, struct utimbuf * times);

struct utimbuf32 {
        __kernel_time_t32 actime, modtime;
};

asmlinkage long
sys32_utime(char * filename, struct utimbuf32 *times)
{
        struct utimbuf t;
        mm_segment_t old_fs;
        int ret;
        char *filenam;
        
        if (!times)
                return sys_utime(filename, NULL);
        if (verify_area(VERIFY_READ, times, sizeof(struct utimbuf32)) ||
            __get_user (t.actime, &times->actime) ||
            __get_user (t.modtime, &times->modtime))
                return -EFAULT;
        filenam = getname (filename);
        ret = PTR_ERR(filenam);
        if (!IS_ERR(filenam)) {
                old_fs = get_fs();
                set_fs (KERNEL_DS); 
                ret = sys_utime(filenam, &t);
                set_fs (old_fs);
                putname(filenam);
        }
        return ret;
}

extern asmlinkage long sys_sysfs(int option, unsigned long arg1,
                                unsigned long arg2);

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

extern asmlinkage long sys_mount(char * dev_name, char * dir_name, char * type,
                                unsigned long new_flags, void *data);

static char *badfs[] = {
        "smbfs", "ncpfs", NULL
};      

static int checktype(char *user_type) 
{ 
        int err = 0; 
        char **s,*kernel_type = getname(user_type); 
        if (!kernel_type || IS_ERR(kernel_type)) 
                return -EFAULT; 
        for (s = badfs; *s; ++s) 
                if (!strcmp(kernel_type, *s)) { 
                        printk(KERN_ERR "mount32: unsupported fs `%s' -- use 64bit mount\n", *s); 
                        err = -EINVAL; 
                        break;
                }       
        putname(user_type); 
        return err;
} 

asmlinkage long
sys32_mount(char *dev_name, char *dir_name, char *type,
            unsigned long new_flags, u32 data)
{
        int err;
        if(!capable(CAP_SYS_ADMIN))
                return -EPERM;
        err = checktype(type);
        if (err)
                return err;
        return sys_mount(dev_name, dir_name, type, new_flags, (void *)AA(data));
}

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)];
};

extern asmlinkage long sys_sysinfo(struct sysinfo *info);

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;
}
                
extern asmlinkage long sys_sched_rr_get_interval(pid_t pid,
                                                struct timespec *interval);

asmlinkage long
sys32_sched_rr_get_interval(__kernel_pid_t32 pid, struct timespec32 *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 (verify_area(VERIFY_WRITE, interval, sizeof(struct timespec32)) ||
            __put_user (t.tv_sec, &interval->tv_sec) ||
            __put_user (t.tv_nsec, &interval->tv_nsec))
                return -EFAULT;
        return ret;
}

extern asmlinkage long sys_sigprocmask(int how, old_sigset_t *set,
                                      old_sigset_t *oset);

asmlinkage long
sys32_sigprocmask(int how, old_sigset32_t *set, old_sigset32_t *oset)
{
        old_sigset_t s;
        int ret;
        mm_segment_t old_fs = get_fs();
        
        if (set && get_user (s, set)) return -EFAULT;
        set_fs (KERNEL_DS);
        ret = sys_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL);
        set_fs (old_fs);
        if (ret) return ret;
        if (oset && put_user (s, oset)) return -EFAULT;
        return 0;
}

extern asmlinkage long sys_sigpending(old_sigset_t *set);

asmlinkage long
sys32_sigpending(old_sigset32_t *set)
{
        old_sigset_t s;
        int ret;
        mm_segment_t old_fs = get_fs();
                
        set_fs (KERNEL_DS);
        ret = sys_sigpending(&s);
        set_fs (old_fs);
        if (put_user (s, set)) return -EFAULT;
        return ret;
}

extern asmlinkage long sys_rt_sigpending(sigset_t *set, size_t sigsetsize);

asmlinkage long
sys32_rt_sigpending(sigset32_t *set, __kernel_size_t32 sigsetsize)
{
        sigset_t s;
        sigset32_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(sigset32_t)))
                        return -EFAULT;
        }
        return ret;
}

siginfo_t32 *
siginfo64to32(siginfo_t32 *d, siginfo_t *s)
{
        memset (d, 0, sizeof(siginfo_t32));
        d->si_signo = s->si_signo;
        d->si_errno = s->si_errno;
        d->si_code = s->si_code;
        if (s->si_signo >= SIGRTMIN) {
                d->si_pid = s->si_pid;
                d->si_uid = s->si_uid;
                memcpy(&d->si_int, &s->si_int, 
                       sizeof(siginfo_t) - offsetof(siginfo_t,si_int));
        } else switch (s->si_signo) {
        /* XXX: What about POSIX1.b timers */
        case SIGCHLD:
                d->si_pid = s->si_pid;
                d->si_status = s->si_status;
                d->si_utime = s->si_utime;
                d->si_stime = s->si_stime;
                break;
        case SIGSEGV:
        case SIGBUS:
        case SIGFPE:
        case SIGILL:
                d->si_addr = (long)(s->si_addr);
//              d->si_trapno = s->si_trapno;
                break;
        case SIGPOLL:
                d->si_band = s->si_band;
                d->si_fd = s->si_fd;
                break;
        default:
                d->si_pid = s->si_pid;
                d->si_uid = s->si_uid;
                break;
        }
        return d;
}

siginfo_t *
siginfo32to64(siginfo_t *d, siginfo_t32 *s)
{
        d->si_signo = s->si_signo;
        d->si_errno = s->si_errno;
        d->si_code = s->si_code;
        if (s->si_signo >= SIGRTMIN) {
                d->si_pid = s->si_pid;
                d->si_uid = s->si_uid;
                memcpy(&d->si_int,
                       &s->si_int,
                       sizeof(siginfo_t) - offsetof(siginfo_t, si_int)); 
        } else switch (s->si_signo) {
        /* XXX: What about POSIX1.b timers */
        case SIGCHLD:
                d->si_pid = s->si_pid;
                d->si_status = s->si_status;
                d->si_utime = s->si_utime;
                d->si_stime = s->si_stime;
                break;
        case SIGSEGV:
        case SIGBUS:
        case SIGFPE:
        case SIGILL:
                d->si_addr = (void *)A(s->si_addr);
//              d->si_trapno = s->si_trapno;
                break;
        case SIGPOLL:
                d->si_band = s->si_band;
                d->si_fd = s->si_fd;
                break;
        default:
                d->si_pid = s->si_pid;
                d->si_uid = s->si_uid;
                break;
        }
        return d;
}

extern asmlinkage long
sys_rt_sigtimedwait(const sigset_t *uthese, siginfo_t *uinfo,
                    const struct timespec *uts, size_t sigsetsize);

asmlinkage long
sys32_rt_sigtimedwait(sigset32_t *uthese, siginfo_t32 *uinfo,
                      struct timespec32 *uts, __kernel_size_t32 sigsetsize)
{
        sigset_t s;
        sigset32_t s32;
        struct timespec t;
        int ret;
        mm_segment_t old_fs = get_fs();
        siginfo_t info;
        siginfo_t32 info32;
                
        if (copy_from_user (&s32, uthese, sizeof(sigset32_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) {
                if (verify_area(VERIFY_READ, uts, sizeof(struct timespec32)) ||
                    __get_user (t.tv_sec, &uts->tv_sec) ||
                    __get_user (t.tv_nsec, &uts->tv_nsec))
                        return -EFAULT;
        }
        set_fs (KERNEL_DS);
        ret = sys_rt_sigtimedwait(&s, &info, uts ? &t : NULL, sigsetsize);
        set_fs (old_fs);
        if (ret >= 0 && uinfo) {
                if (copy_to_user (uinfo, siginfo64to32(&info32, &info),
                                  sizeof(siginfo_t32)))
                        return -EFAULT;
        }
        return ret;
}

extern asmlinkage long
sys_rt_sigqueueinfo(int pid, int sig, siginfo_t *uinfo);

asmlinkage long
sys32_rt_sigqueueinfo(int pid, int sig, siginfo_t32 *uinfo)
{
        siginfo_t info;
        siginfo_t32 info32;
        int ret;
        mm_segment_t old_fs = get_fs();
        
        if (copy_from_user (&info32, uinfo, sizeof(siginfo_t32)))
                return -EFAULT;
        /* XXX: Is this correct? */
        siginfo32to64(&info, &info32);
        set_fs (KERNEL_DS);
        ret = sys_rt_sigqueueinfo(pid, sig, &info);
        set_fs (old_fs);
        return ret;
}

extern void check_pending(int signum);

asmlinkage long sys_utimes(char *, struct timeval *);

asmlinkage long
sys32_utimes(char *filename, struct timeval32 *tvs)
{
        char *kfilename;
        struct timeval ktvs[2];
        mm_segment_t old_fs;
        int ret;

        kfilename = getname(filename);
        ret = PTR_ERR(kfilename);
        if (!IS_ERR(kfilename)) {
                if (tvs) {
                        if (get_tv32(&ktvs[0], tvs) ||
                            get_tv32(&ktvs[1], 1+tvs))
                                return -EFAULT;
                }

                old_fs = get_fs();
                set_fs(KERNEL_DS);
                ret = sys_utimes(kfilename, &ktvs[0]);
                set_fs(old_fs);

                putname(kfilename);
        }
        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
}

extern asmlinkage ssize_t sys_pread(unsigned int fd, char * buf,
                                    size_t count, loff_t pos);

extern asmlinkage ssize_t sys_pwrite(unsigned int fd, const char * buf,
                                     size_t count, loff_t pos);

typedef __kernel_ssize_t32 ssize_t32;


/* warning: next two assume little endian */ 
asmlinkage long
sys32_pread(unsigned int fd, char *ubuf, __kernel_size_t32 count,
            u32 poslo, u32 poshi)
{
        return sys_pread(fd, ubuf, count,
                         ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long
sys32_pwrite(unsigned int fd, char *ubuf, __kernel_size_t32 count,
             u32 poslo, u32 poshi)
{
        return sys_pwrite(fd, ubuf, count,
                          ((loff_t)AA(poshi) << 32) | AA(poslo));
}


extern asmlinkage long sys_personality(unsigned long);

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;
}

extern asmlinkage ssize_t sys_sendfile(int out_fd, int in_fd, off_t *offset,
                                       size_t count); 

asmlinkage long
sys32_sendfile(int out_fd, int in_fd, __kernel_off_t32 *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;
}

extern long sys_modify_ldt(int,void*,unsigned long);

asmlinkage long sys32_modify_ldt(int func, void *ptr, unsigned long bytecount)
{
        long ret;
        if (func == 0x1 || func == 0x11) { 
                                struct modify_ldt_ldt_s info;
                mm_segment_t old_fs = get_fs();
                if (bytecount != sizeof(struct modify_ldt_ldt_s))
                        return -EINVAL;
                if (copy_from_user(&info, ptr, sizeof(struct modify_ldt_ldt_s)))
                        return -EFAULT;
                /* lm bit was undefined in the 32bit ABI and programs
                   give it random values. Force it to zero here. */
                info.lm = 0; 
                set_fs(KERNEL_DS);
                ret = sys_modify_ldt(func, &info, bytecount);
                set_fs(old_fs);
        }  else { 
                ret = sys_modify_ldt(func, ptr, bytecount); 
        }
        return ret;
}

/* Handle adjtimex compatability. */

struct timex32 {
        u32 modes;
        s32 offset, freq, maxerror, esterror;
        s32 status, constant, precision, tolerance;
        struct timeval32 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 |= PROT_EXEC;

        down_write(&mm->mmap_sem);
        error = do_mmap_pgoff(file, addr, len, prot, flags|MAP_32BIT, pgoff);
        up_write(&mm->mmap_sem);

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

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

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

asmlinkage long sys32_uname(struct old_utsname * name)
{
        int err;
        down_read(&uts_sem);
        err=copy_to_user(name, &system_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;
}

extern int sys_ustat(dev_t, struct ustat *);

asmlinkage long sys32_ustat(dev_t dev, struct ustat32 *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(char *))
                        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_fork(struct pt_regs regs)
{
        return do_fork(SIGCHLD, regs.rsp, &regs, 0);
}

asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp, struct pt_regs regs)
{
        if (!newsp)
                newsp = regs.rsp;
        return do_fork(clone_flags, newsp, &regs, 0);
}

/*
 * This is trivial, and on the face of it looks like it
 * could equally well be done in user mode.
 *
 * Not so, for quite unobvious reasons - register pressure.
 * In user mode vfork() cannot have a stack frame, and if
 * done by calling the "clone()" system call directly, you
 * do not have enough call-clobbered registers to hold all
 * the information you need.
 */
asmlinkage long sys32_vfork(struct pt_regs regs)
{
        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.rsp, &regs, 0);
}

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

extern off_t sys_lseek (unsigned int fd, off_t offset, unsigned int origin);

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

extern int sys_kill(pid_t pid, int sig); 

asmlinkage 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];
        __kernel_dev_t32        ex32_dev;
        __kernel_ino_t32        ex32_ino;
        s32                     ex32_flags;
        __kernel_uid_t32        ex32_anon_uid;
        __kernel_gid_t32        ex32_anon_gid;
};

struct nfsctl_uidmap32 {
        u32                     ug32_ident;   /* char * */
        __kernel_uid_t32        ug32_uidbase;
        s32                     ug32_uidlen;
        u32                     ug32_udimap;  /* uid_t * */
        __kernel_uid_t32        ug32_gidbase;
        s32                     ug32_gidlen;
        u32                     ug32_gdimap;  /* gid_t * */
};

struct nfsctl_fhparm32 {
        struct sockaddr         gf32_addr;
        __kernel_dev_t32        gf32_dev;
        __kernel_ino_t32        gf32_ino;
        s32                     gf32_version;
};

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_uidmap32  u32_umap;
                struct nfsctl_fhparm32  u32_getfh;
                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_umap       u.u32_umap
#define ca32_getfh      u.u32_getfh
#define ca32_getfd      u.u32_getfd
#define ca32_getfs      u.u32_getfs
#define ca32_authd      u.u32_authd
};

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);
        karg->ca_export.ex_anon_uid = high2lowuid(karg->ca_export.ex_anon_uid);
        karg->ca_export.ex_anon_gid = high2lowgid(karg->ca_export.ex_anon_gid);
        return err;
}

static int nfs_getfh32_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_getfh.gf_addr,
                          &arg32->ca32_getfh.gf32_addr,
                          (sizeof(struct sockaddr)));
        err |= __get_user(karg->ca_getfh.gf_dev,
                      &arg32->ca32_getfh.gf32_dev);
        err |= __get_user(karg->ca_getfh.gf_ino,
                      &arg32->ca32_getfh.gf32_ino);
        err |= __get_user(karg->ca_getfh.gf_version,
                      &arg32->ca32_getfh.gf32_version);
        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));
}

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_GETFH:
                err = nfs_getfh32_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_GETFH) ||
           (cmd == NFSCTL_GETFD) ||
           (cmd == NFSCTL_GETFS))
                err = nfs_getfh32_res_trans(kres, res32);

done:
        if(karg) {
                if(cmd == NFSCTL_UGIDUPDATE) {
                        if(karg->ca_umap.ug_ident)
                                kfree(karg->ca_umap.ug_ident);
                        if(karg->ca_umap.ug_udimap)
                                kfree(karg->ca_umap.ug_udimap);
                        if(karg->ca_umap.ug_gdimap)
                                kfree(karg->ca_umap.ug_gdimap);
                }
                kfree(karg);
        }
        if(kres)
                kfree(kres);
        return err;
}
#else /* !NFSD */
extern asmlinkage long sys_ni_syscall(void);
long asmlinkage sys32_nfsservctl(int cmd, void *notused, void *notused2)
{
        return sys_ni_syscall();
}
#endif

#ifdef CONFIG_MODULES

extern asmlinkage unsigned long sys_create_module(const char *name_user, size_t size);

asmlinkage unsigned long sys32_create_module(const char *name_user, __kernel_size_t32 size)
{ 
        return sys_create_module(name_user, (size_t)size);
}

extern asmlinkage int sys_init_module(const char *name_user, struct module *mod_user);

/* Hey, when you're trying to init module, take time and prepare us a nice 64bit
 * module structure, even if from 32bit modutils... Why to pollute kernel... :))
 */
asmlinkage int sys32_init_module(const char *name_user, struct module *mod_user)
{
        return sys_init_module(name_user, mod_user);
}

extern asmlinkage int sys_delete_module(const char *name_user);

asmlinkage int sys32_delete_module(const char *name_user)
{
        return sys_delete_module(name_user);
}

struct module_info32 {
        u32 addr;
        u32 size;
        u32 flags;
        s32 usecount;
};

/* Query various bits about modules.  */

static inline long
get_mod_name(const char *user_name, char **buf)
{
        unsigned long page;
        long retval;

        if ((unsigned long)user_name >= TASK_SIZE
            && !segment_eq(get_fs (), KERNEL_DS))
                return -EFAULT;

        page = __get_free_page(GFP_KERNEL);
        if (!page)
                return -ENOMEM;

        retval = strncpy_from_user((char *)page, user_name, PAGE_SIZE);
        if (retval > 0) {
                if (retval < PAGE_SIZE) {
                        *buf = (char *)page;
                        return retval;
        } 
                retval = -ENAMETOOLONG;
        } else if (!retval)
                retval = -EINVAL;

        free_page(page);
        return retval;
}

static inline void
put_mod_name(char *buf)
{
        free_page((unsigned long)buf);
} 

static __inline__ struct module *find_module(const char *name)
{
        struct module *mod;

        for (mod = module_list; mod ; mod = mod->next) {
                if (mod->flags & MOD_DELETED)
                        continue;
                if (!strcmp(mod->name, name))
                        break;
        }

        return mod;
}

static int
qm_modules(char *buf, size_t bufsize, __kernel_size_t32 *ret)
{
        struct module *mod;
        size_t nmod, space, len;

        nmod = space = 0;

        for (mod = module_list; mod->next != NULL; mod = mod->next, ++nmod) {
                len = strlen(mod->name)+1;
                if (len > bufsize)
                        goto calc_space_needed;
                if (copy_to_user(buf, mod->name, len))
                        return -EFAULT;
                buf += len;
                bufsize -= len;
                space += len;
        }

        if (put_user(nmod, ret))
                return -EFAULT;
        else
                return 0;

calc_space_needed:
        space += len;
        while ((mod = mod->next)->next != NULL)
                space += strlen(mod->name)+1;

        if (put_user(space, ret))
                return -EFAULT;
        else
                return -ENOSPC;
}

static int
qm_deps(struct module *mod, char *buf, size_t bufsize, __kernel_size_t32 *ret)
{
        size_t i, space, len;

        if (mod->next == NULL)
                return -EINVAL;
        if (!MOD_CAN_QUERY(mod))
                return put_user(0, ret);

        space = 0;
        for (i = 0; i < mod->ndeps; ++i) {
                const char *dep_name = mod->deps[i].dep->name;

                len = strlen(dep_name)+1;
                if (len > bufsize)
                        goto calc_space_needed;
                if (copy_to_user(buf, dep_name, len))
                        return -EFAULT;
                buf += len;
                bufsize -= len;
                space += len;
        }

        return put_user(i, ret);

calc_space_needed:
        space += len;
        while (++i < mod->ndeps)
                space += strlen(mod->deps[i].dep->name)+1;

        if (put_user(space, ret))
                return -EFAULT;
        else
                return -ENOSPC;
}

static int
qm_refs(struct module *mod, char *buf, size_t bufsize, __kernel_size_t32 *ret)
{
        size_t nrefs, space, len;
        struct module_ref *ref;

        if (mod->next == NULL)
                return -EINVAL;
        if (!MOD_CAN_QUERY(mod))
                if (put_user(0, ret))
                        return -EFAULT;
                else
                        return 0;

        space = 0;
        for (nrefs = 0, ref = mod->refs; ref ; ++nrefs, ref = ref->next_ref) {
                const char *ref_name = ref->ref->name;

                len = strlen(ref_name)+1;
                if (len > bufsize)
                        goto calc_space_needed;
                if (copy_to_user(buf, ref_name, len))
                        return -EFAULT;
                buf += len;
                bufsize -= len;
                space += len;
        }

        if (put_user(nrefs, ret))
                return -EFAULT;
        else
                return 0;

calc_space_needed:
        space += len;
        while ((ref = ref->next_ref) != NULL)
                space += strlen(ref->ref->name)+1;

        if (put_user(space, ret))
                return -EFAULT;
        else
                return -ENOSPC;
}

static inline int
qm_symbols(struct module *mod, char *buf, size_t bufsize, __kernel_size_t32 *ret)
{
        size_t i, space, len;
        struct module_symbol *s;
        char *strings;
        unsigned *vals;

        if (!MOD_CAN_QUERY(mod))
                if (put_user(0, ret))
                        return -EFAULT;
                else
                        return 0;

        space = mod->nsyms * 2*sizeof(u32);

        i = len = 0;
        s = mod->syms;

        if (space > bufsize)
                goto calc_space_needed;

        if (!access_ok(VERIFY_WRITE, buf, space))
                return -EFAULT;

        bufsize -= space;
        vals = (unsigned *)buf;
        strings = buf+space;

        for (; i < mod->nsyms ; ++i, ++s, vals += 2) {
                len = strlen(s->name)+1;
                if (len > bufsize)
                        goto calc_space_needed;

                if (copy_to_user(strings, s->name, len)
                    || __put_user(s->value, vals+0)
                    || __put_user(space, vals+1))
                        return -EFAULT;

                strings += len;
                bufsize -= len;
                space += len;
        }

        if (put_user(i, ret))
                return -EFAULT;
        else
                return 0;

calc_space_needed:
        for (; i < mod->nsyms; ++i, ++s)
                space += strlen(s->name)+1;

        if (put_user(space, ret))
                return -EFAULT;
        else
                return -ENOSPC;
}

static inline int
qm_info(struct module *mod, char *buf, size_t bufsize, __kernel_size_t32 *ret)
{
        int error = 0;

        if (mod->next == NULL)
                return -EINVAL;

        if (sizeof(struct module_info32) <= bufsize) {
                struct module_info32 info;
                info.addr = (unsigned long)mod;
                info.size = mod->size;
                info.flags = mod->flags;
                info.usecount =
                        ((mod_member_present(mod, can_unload)
                          && mod->can_unload)
                         ? -1 : atomic_read(&mod->uc.usecount));

                if (copy_to_user(buf, &info, sizeof(struct module_info32)))
                        return -EFAULT;
        } else
                error = -ENOSPC;

        if (put_user(sizeof(struct module_info32), ret))
                return -EFAULT;

        return error;
}

asmlinkage int sys32_query_module(char *name_user, int which, char *buf, __kernel_size_t32 bufsize, u32 ret)
{
        struct module *mod;
        int err;

        lock_kernel();
        if (name_user == 0) {
                /* This finds "kernel_module" which is not exported. */
                for(mod = module_list; mod->next != NULL; mod = mod->next)
                        ;
        } else {
                long namelen;
                char *name;

                if ((namelen = get_mod_name(name_user, &name)) < 0) {
                        err = namelen;
                        goto out;
                }
                err = -ENOENT;
                if (namelen == 0) {
                        /* This finds "kernel_module" which is not exported. */
                        for(mod = module_list; mod->next != NULL; mod = mod->next)
                                ;
                } else if ((mod = find_module(name)) == NULL) {
                        put_mod_name(name);
                        goto out;
                }
                put_mod_name(name);
        }

        switch (which)
        {
        case 0:
                err = 0;
                break;
        case QM_MODULES:
                err = qm_modules(buf, bufsize, (__kernel_size_t32 *)AA(ret));
                break;
        case QM_DEPS:
                err = qm_deps(mod, buf, bufsize, (__kernel_size_t32 *)AA(ret));
                break;
        case QM_REFS:
                err = qm_refs(mod, buf, bufsize, (__kernel_size_t32 *)AA(ret));
                break;
        case QM_SYMBOLS:
                err = qm_symbols(mod, buf, bufsize, (__kernel_size_t32 *)AA(ret));
                break;
        case QM_INFO:
                err = qm_info(mod, buf, bufsize, (__kernel_size_t32 *)AA(ret));
                break;
        default:
                err = -EINVAL;
                break;
        }
out:
        unlock_kernel();
        return err;
}

struct kernel_sym32 {
        u32 value;
        char name[60];
};
                 
extern asmlinkage int sys_get_kernel_syms(struct kernel_sym *table);

asmlinkage int sys32_get_kernel_syms(struct kernel_sym32 *table)
{
        int len, i;
        struct kernel_sym *tbl;
        mm_segment_t old_fs;
        
        len = sys_get_kernel_syms(NULL);
        if (!table) return len;
        tbl = kmalloc (len * sizeof (struct kernel_sym), GFP_KERNEL);
        if (!tbl) return -ENOMEM;
        old_fs = get_fs();
        set_fs (KERNEL_DS);
        sys_get_kernel_syms(tbl);
        set_fs (old_fs);
        for (i = 0; i < len; i++, table++) {
                if (put_user (tbl[i].value, &table->value) ||
                    copy_to_user (table->name, tbl[i].name, 60))
                        break;
        }
        kfree (tbl);
        return i;
}

#else /* CONFIG_MODULES */

asmlinkage unsigned long
sys32_create_module(const char *name_user, size_t size)
{
        return -ENOSYS;
}

asmlinkage int