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sys_ia32.c

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

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

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

#define AA(__x)         ((unsigned long)(__x))

int cp_compat_stat(struct kstat *kbuf, struct compat_stat __user *ubuf)
{
      compat_ino_t ino;

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

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

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

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

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

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

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

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

asmlinkage long
sys32_fstatat(unsigned int dfd, char __user *filename,
            struct stat64 __user* statbuf, int flag)
{
      struct kstat stat;
      int error = -EINVAL;

      if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
            goto out;

      if (flag & AT_SYMLINK_NOFOLLOW)
            error = vfs_lstat_fd(dfd, filename, &stat);
      else
            error = vfs_stat_fd(dfd, filename, &stat);

      if (!error)
            error = cp_stat64(statbuf, &stat);

out:
      return error;
}

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

      up_write(&mm->mmap_sem); 

      return retval;
}

asmlinkage long 
sys32_mprotect(unsigned long start, size_t len, unsigned long prot)
{
      return sys_mprotect(start,len,prot); 
}

asmlinkage long
sys32_pipe(int __user *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 __user *act,
               struct sigaction32 __user *oact,  unsigned int sigsetsize)
{
      struct k_sigaction new_ka, old_ka;
      int ret;
      compat_sigset_t set32;

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

      if (act) {
            compat_uptr_t handler, restorer;

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

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

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

      return ret;
}

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

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

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

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

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

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

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

      return ret;
}

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

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

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

extern unsigned int alarm_setitimer(unsigned int seconds);

asmlinkage long
sys32_alarm(unsigned int seconds)
{
      return alarm_setitimer(seconds);
}

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

extern struct timezone sys_tz;

asmlinkage long
sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
      if (tv) {
            struct timeval ktv;
            do_gettimeofday(&ktv);
            if (put_tv32(tv, &ktv))
                  return -EFAULT;
      }
      if (tz) {
            if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
                  return -EFAULT;
      }
      return 0;
}

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

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

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

struct 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 __user *arg)
{
      struct sel_arg_struct a;

      if (copy_from_user(&a, arg, sizeof(a)))
            return -EFAULT;
      return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
                         compat_ptr(a.exp), compat_ptr(a.tvp));
}

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

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

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

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

asmlinkage long
sys32_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval)
{
      struct timespec t;
      int ret;
      mm_segment_t old_fs = get_fs ();
      
      set_fs (KERNEL_DS);
      ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
      set_fs (old_fs);
      if (put_compat_timespec(&t, interval))
            return -EFAULT;
      return ret;
}

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

asmlinkage long
sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
{
      siginfo_t info;
      int ret;
      mm_segment_t old_fs = get_fs();
      
      if (copy_siginfo_from_user32(&info, uinfo))
            return -EFAULT;
      set_fs (KERNEL_DS);
      ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
      set_fs (old_fs);
      return ret;
}

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


#ifdef CONFIG_SYSCTL_SYSCALL
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 __user *args32)
{
      struct sysctl_ia32 a32;
      mm_segment_t old_fs = get_fs ();
      void __user *oldvalp, *newvalp;
      size_t oldlen;
      int __user *namep;
      long ret;

      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 = compat_ptr(a32.name);
      oldvalp = compat_ptr(a32.oldval);
      newvalp =  compat_ptr(a32.newval);

      if ((oldvalp && get_user(oldlen, (int __user *)compat_ptr(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, (size_t __user *)&oldlen,
                  newvalp, (size_t) a32.newlen);
      unlock_kernel();
      set_fs(old_fs);

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

      return ret;
}
#endif

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

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


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

asmlinkage long
sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *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 ? (off_t __user *)&of : NULL,
                     count);
      set_fs(old_fs);
      
      if (offset && put_user(of, offset))
            return -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;
      }

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

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

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

      if (!name)
            return -EFAULT;
      if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
            return -EFAULT;
  
      down_read(&uts_sem);

      err = __copy_to_user(&name->sysname,&utsname()->sysname,
                        __OLD_UTS_LEN);
      err |= __put_user(0,name->sysname+__OLD_UTS_LEN);
      err |= __copy_to_user(&name->nodename,&utsname()->nodename,
                        __OLD_UTS_LEN);
      err |= __put_user(0,name->nodename+__OLD_UTS_LEN);
      err |= __copy_to_user(&name->release,&utsname()->release,
                        __OLD_UTS_LEN);
      err |= __put_user(0,name->release+__OLD_UTS_LEN);
      err |= __copy_to_user(&name->version,&utsname()->version,
                        __OLD_UTS_LEN);
      err |= __put_user(0,name->version+__OLD_UTS_LEN);
      {
            char *arch = "x86_64";
            if (personality(current->personality) == PER_LINUX32)
                  arch = "i686";
             
            err |= __copy_to_user(&name->machine, arch, strlen(arch)+1);
      }

      up_read(&uts_sem);

      err = err ? -EFAULT : 0;

      return err;
}

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

long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
{
      struct ustat u;
      mm_segment_t seg;
      int ret;
      
      seg = get_fs(); 
      set_fs(KERNEL_DS); 
      ret = sys_ustat(dev, (struct ustat __user *)&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;
} 

asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
                       compat_uptr_t __user *envp, struct pt_regs *regs)
{
      long error;
      char * filename;

      filename = getname(name);
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            return error;
      error = compat_do_execve(filename, argv, envp, regs);
      if (error == 0) {
            task_lock(current);
            current->ptrace &= ~PT_DTRACE;
            task_unlock(current);
      }
      putname(filename);
      return error;
}

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

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

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

long sys32_kill(int pid, int sig)
{
      return sys_kill(pid, sig);
}
 
long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high, 
                  __u32 len_low, __u32 len_high, int advice)
{ 
      return sys_fadvise64_64(fd,
                         (((u64)offset_high)<<32) | offset_low,
                         (((u64)len_high)<<32) | len_low,
                         advice); 
} 

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

long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
                    char __user * buf, size_t len)
{
      return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
}

asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
{
      return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
}

asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
                     unsigned n_low, unsigned n_hi,  int flags)
{
      return sys_sync_file_range(fd,
                           ((u64)off_hi << 32) | off_low,
                           ((u64)n_hi << 32) | n_low, flags);
}

asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
                 int advice)
{
      return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
                        len, advice);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
                        unsigned offset_hi, unsigned len_lo,
                        unsigned len_hi)
{
      return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
                       ((u64)len_hi << 32) | len_lo);
}

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