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sys_sparc32.c

/* sys_sparc32.c: Conversion between 32bit and 64bit native syscalls.
 *
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997, 2007 David S. Miller (davem@davemloft.net)
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/capability.h>
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <linux/file.h> 
#include <linux/signal.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/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/filter.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/binfmts.h>
#include <linux/dnotify.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/ptrace.h>

#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/fpumacro.h>
#include <asm/mmu_context.h>
#include <asm/compat_signal.h>

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

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

#ifdef CONFIG_SYSVIPC                                                        
asmlinkage long compat_sys_ipc(u32 call, u32 first, u32 second, u32 third, compat_uptr_t ptr, u32 fifth)
{
      int version;

      version = call >> 16; /* hack for backward compatibility */
      call &= 0xffff;

      switch (call) {
      case SEMTIMEDOP:
            if (fifth)
                  /* sign extend semid */
                  return compat_sys_semtimedop((int)first,
                                         compat_ptr(ptr), second,
                                         compat_ptr(fifth));
            /* else fall through for normal semop() */
      case SEMOP:
            /* struct sembuf is the same on 32 and 64bit :)) */
            /* sign extend semid */
            return sys_semtimedop((int)first, compat_ptr(ptr), second,
                              NULL);
      case SEMGET:
            /* sign extend key, nsems */
            return sys_semget((int)first, (int)second, third);
      case SEMCTL:
            /* sign extend semid, semnum */
            return compat_sys_semctl((int)first, (int)second, third,
                               compat_ptr(ptr));

      case MSGSND:
            /* sign extend msqid */
            return compat_sys_msgsnd((int)first, (int)second, third,
                               compat_ptr(ptr));
      case MSGRCV:
            /* sign extend msqid, msgtyp */
            return compat_sys_msgrcv((int)first, second, (int)fifth,
                               third, version, compat_ptr(ptr));
      case MSGGET:
            /* sign extend key */
            return sys_msgget((int)first, second);
      case MSGCTL:
            /* sign extend msqid */
            return compat_sys_msgctl((int)first, second, compat_ptr(ptr));

      case SHMAT:
            /* sign extend shmid */
            return compat_sys_shmat((int)first, second, third, version,
                              compat_ptr(ptr));
      case SHMDT:
            return sys_shmdt(compat_ptr(ptr));
      case SHMGET:
            /* sign extend key_t */
            return sys_shmget((int)first, second, third);
      case SHMCTL:
            /* sign extend shmid */
            return compat_sys_shmctl((int)first, second, compat_ptr(ptr));

      default:
            return -ENOSYS;
      };

      return -ENOSYS;
}
#endif

asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
{
      if ((int)high < 0)
            return -EINVAL;
      else
            return sys_truncate(path, (high << 32) | low);
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
{
      if ((int)high < 0)
            return -EINVAL;
      else
            return sys_ftruncate(fd, (high << 32) | low);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
      compat_ino_t ino;
      int err;

      if (stat->size > MAX_NON_LFS || !old_valid_dev(stat->dev) ||
          !old_valid_dev(stat->rdev))
            return -EOVERFLOW;

      ino = stat->ino;
      if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
            return -EOVERFLOW;

      err  = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
      err |= put_user(stat->ino, &statbuf->st_ino);
      err |= put_user(stat->mode, &statbuf->st_mode);
      err |= put_user(stat->nlink, &statbuf->st_nlink);
      err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
      err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
      err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
      err |= put_user(stat->size, &statbuf->st_size);
      err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
      err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
      err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
      err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
      err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
      err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
      err |= put_user(stat->blksize, &statbuf->st_blksize);
      err |= put_user(stat->blocks, &statbuf->st_blocks);
      err |= put_user(0, &statbuf->__unused4[0]);
      err |= put_user(0, &statbuf->__unused4[1]);

      return err;
}

static int cp_compat_stat64(struct kstat *stat,
                      struct compat_stat64 __user *statbuf)
{
      int err;

      err  = put_user(huge_encode_dev(stat->dev), &statbuf->st_dev);
      err |= put_user(stat->ino, &statbuf->st_ino);
      err |= put_user(stat->mode, &statbuf->st_mode);
      err |= put_user(stat->nlink, &statbuf->st_nlink);
      err |= put_user(stat->uid, &statbuf->st_uid);
      err |= put_user(stat->gid, &statbuf->st_gid);
      err |= put_user(huge_encode_dev(stat->rdev), &statbuf->st_rdev);
      err |= put_user(0, (unsigned long __user *) &statbuf->__pad3[0]);
      err |= put_user(stat->size, &statbuf->st_size);
      err |= put_user(stat->blksize, &statbuf->st_blksize);
      err |= put_user(0, (unsigned int __user *) &statbuf->__pad4[0]);
      err |= put_user(0, (unsigned int __user *) &statbuf->__pad4[4]);
      err |= put_user(stat->blocks, &statbuf->st_blocks);
      err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
      err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
      err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
      err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
      err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
      err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
      err |= put_user(0, &statbuf->__unused4);
      err |= put_user(0, &statbuf->__unused5);

      return err;
}

asmlinkage long compat_sys_stat64(char __user * filename,
            struct compat_stat64 __user *statbuf)
{
      struct kstat stat;
      int error = vfs_stat(filename, &stat);

      if (!error)
            error = cp_compat_stat64(&stat, statbuf);
      return error;
}

asmlinkage long compat_sys_lstat64(char __user * filename,
            struct compat_stat64 __user *statbuf)
{
      struct kstat stat;
      int error = vfs_lstat(filename, &stat);

      if (!error)
            error = cp_compat_stat64(&stat, statbuf);
      return error;
}

asmlinkage long compat_sys_fstat64(unsigned int fd,
            struct compat_stat64 __user * statbuf)
{
      struct kstat stat;
      int error = vfs_fstat(fd, &stat);

      if (!error)
            error = cp_compat_stat64(&stat, statbuf);
      return error;
}

asmlinkage long compat_sys_fstatat64(unsigned int dfd, char __user *filename,
            struct compat_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_compat_stat64(&stat, statbuf);

out:
      return error;
}

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

asmlinkage long compat_sys_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 compat_sys_rt_sigprocmask(int how,
                                compat_sigset_t __user *set,
                                compat_sigset_t __user *oset,
                                compat_size_t 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;
}

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 compat_sys_rt_sigqueueinfo(int pid, int sig,
                                 struct compat_siginfo __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;
}

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

      WARN_ON_ONCE(sig >= 0);
      sig = -sig;

        if (act) {
            compat_old_sigset_t mask;
            u32 u_handler, u_restorer;
            
            ret = get_user(u_handler, &act->sa_handler);
            new_ka.sa.sa_handler =  compat_ptr(u_handler);
            ret |= __get_user(u_restorer, &act->sa_restorer);
            new_ka.sa.sa_restorer = compat_ptr(u_restorer);
            ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
            ret |= __get_user(mask, &act->sa_mask);
            if (ret)
                  return ret;
            new_ka.ka_restorer = NULL;
            siginitset(&new_ka.sa.sa_mask, mask);
        }

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

      if (!ret && oact) {
            ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
            ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
            ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
            ret |= __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
        }

      return ret;
}

asmlinkage long compat_sys_rt_sigaction(int sig,
                              struct sigaction32 __user *act,
                              struct sigaction32 __user *oact,
                              void __user *restorer,
                              compat_size_t 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) {
            u32 u_handler, u_restorer;

            new_ka.ka_restorer = restorer;
            ret = get_user(u_handler, &act->sa_handler);
            new_ka.sa.sa_handler =  compat_ptr(u_handler);
            ret |= __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t));
            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 |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
            ret |= __get_user(u_restorer, &act->sa_restorer);
            new_ka.sa.sa_restorer = compat_ptr(u_restorer);
                if (ret)
                  return -EFAULT;
      }

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

      if (!ret && oact) {
            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];
            }
            ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
            ret |= __copy_to_user(&oact->sa_mask, &set32, sizeof(compat_sigset_t));
            ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
            ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
            if (ret)
                  ret = -EFAULT;
        }

        return ret;
}

/*
 * sparc32_execve() executes a new program after the asm stub has set
 * things up for us.  This should basically do what I want it to.
 */
asmlinkage long sparc32_execve(struct pt_regs *regs)
{
      int error, base = 0;
      char *filename;

      /* User register window flush is done by entry.S */

      /* Check for indirect call. */
      if ((u32)regs->u_regs[UREG_G1] == 0)
            base = 1;

      filename = getname(compat_ptr(regs->u_regs[base + UREG_I0]));
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            goto out;

      error = compat_do_execve(filename,
                         compat_ptr(regs->u_regs[base + UREG_I1]),
                         compat_ptr(regs->u_regs[base + UREG_I2]), regs);

      putname(filename);

      if (!error) {
            fprs_write(0);
            current_thread_info()->xfsr[0] = 0;
            current_thread_info()->fpsaved[0] = 0;
            regs->tstate &= ~TSTATE_PEF;
      }
out:
      return error;
}

#ifdef CONFIG_MODULES

asmlinkage long sys32_init_module(void __user *umod, u32 len,
                          const char __user *uargs)
{
      return sys_init_module(umod, len, uargs);
}

asmlinkage long sys32_delete_module(const char __user *name_user,
                            unsigned int flags)
{
      return sys_delete_module(name_user, flags);
}

#else /* CONFIG_MODULES */

asmlinkage long sys32_init_module(const char __user *name_user,
                          struct module __user *mod_user)
{
      return -ENOSYS;
}

asmlinkage long sys32_delete_module(const char __user *name_user)
{
      return -ENOSYS;
}

#endif  /* CONFIG_MODULES */

/* 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;
}

static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
{
      long usec;

      if (!access_ok(VERIFY_READ, i, sizeof(*i)))
            return -EFAULT;
      if (__get_user(o->tv_sec, &i->tv_sec))
            return -EFAULT;
      if (__get_user(usec, &i->tv_usec))
            return -EFAULT;
      o->tv_nsec = usec * 1000;
      return 0;
}

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

      if (tv) {
            if (get_ts32(&kts, tv))
                  return -EFAULT;
      }
      if (tz) {
            if (copy_from_user(&ktz, tz, sizeof(ktz)))
                  return -EFAULT;
      }

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

/* These are here just in case some old sparc32 binary calls it. */
asmlinkage long sys32_pause(void)
{
      current->state = TASK_INTERRUPTIBLE;
      schedule();
      return -ERESTARTNOHAND;
}

asmlinkage compat_ssize_t sys32_pread64(unsigned int fd,
                              char __user *ubuf,
                              compat_size_t count,
                              unsigned long poshi,
                              unsigned long poslo)
{
      return sys_pread64(fd, ubuf, count, (poshi << 32) | poslo);
}

asmlinkage compat_ssize_t sys32_pwrite64(unsigned int fd,
                               char __user *ubuf,
                               compat_size_t count,
                               unsigned long poshi,
                               unsigned long poslo)
{
      return sys_pwrite64(fd, ubuf, count, (poshi << 32) | poslo);
}

asmlinkage long compat_sys_readahead(int fd,
                             unsigned long offhi,
                             unsigned long offlo,
                             compat_size_t count)
{
      return sys_readahead(fd, (offhi << 32) | offlo, count);
}

long compat_sys_fadvise64(int fd,
                    unsigned long offhi,
                    unsigned long offlo,
                    compat_size_t len, int advice)
{
      return sys_fadvise64_64(fd, (offhi << 32) | offlo, len, advice);
}

long compat_sys_fadvise64_64(int fd,
                       unsigned long offhi, unsigned long offlo,
                       unsigned long lenhi, unsigned long lenlo,
                       int advice)
{
      return sys_fadvise64_64(fd,
                        (offhi << 32) | offlo,
                        (lenhi << 32) | lenlo,
                        advice);
}

asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
                            compat_off_t __user *offset,
                            compat_size_t 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 compat_sys_sendfile64(int out_fd, int in_fd,
                              compat_loff_t __user *offset,
                              compat_size_t count)
{
      mm_segment_t old_fs = get_fs();
      int ret;
      loff_t lof;
      
      if (offset && get_user(lof, offset))
            return -EFAULT;
            
      set_fs(KERNEL_DS);
      ret = sys_sendfile64(out_fd, in_fd,
                       offset ? (loff_t __user *) &lof : NULL,
                       count);
      set_fs(old_fs);
      
      if (offset && put_user(lof, offset))
            return -EFAULT;
            
      return ret;
}

/* This is just a version for 32-bit applications which does
 * not force O_LARGEFILE on.
 */

asmlinkage long sparc32_open(const char __user *filename,
                       int flags, int mode)
{
      return do_sys_open(AT_FDCWD, filename, flags, mode);
}

extern unsigned long do_mremap(unsigned long addr,
      unsigned long old_len, unsigned long new_len,
      unsigned long flags, unsigned long new_addr);
                
asmlinkage unsigned long sys32_mremap(unsigned long addr,
      unsigned long old_len, unsigned long new_len,
      unsigned long flags, u32 __new_addr)
{
      unsigned long ret = -EINVAL;
      unsigned long new_addr = __new_addr;

      if (unlikely(sparc_mmap_check(addr, old_len)))
            goto out;
      if (unlikely(sparc_mmap_check(new_addr, new_len)))
            goto out;
      down_write(&current->mm->mmap_sem);
      ret = do_mremap(addr, old_len, new_len, flags, new_addr);
      up_write(&current->mm->mmap_sem);
out:
      return ret;       
}

struct __sysctl_args32 {
      u32 name;
      int nlen;
      u32 oldval;
      u32 oldlenp;
      u32 newval;
      u32 newlen;
      u32 __unused[4];
};

asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
{
#ifndef CONFIG_SYSCTL_SYSCALL
      return -ENOSYS;
#else
      struct __sysctl_args32 tmp;
      int error;
      size_t oldlen, __user *oldlenp = NULL;
      unsigned long addr = (((unsigned long)&args->__unused[0]) + 7UL) & ~7UL;

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

      if (tmp.oldval && tmp.oldlenp) {
            /* Duh, this is ugly and might not work if sysctl_args
               is in read-only memory, but do_sysctl does indirectly
               a lot of uaccess in both directions and we'd have to
               basically copy the whole sysctl.c here, and
               glibc's __sysctl uses rw memory for the structure
               anyway.  */
            if (get_user(oldlen, (u32 __user *)(unsigned long)tmp.oldlenp) ||
                put_user(oldlen, (size_t __user *)addr))
                  return -EFAULT;
            oldlenp = (size_t __user *)addr;
      }

      lock_kernel();
      error = do_sysctl((int __user *)(unsigned long) tmp.name,
                    tmp.nlen,
                    (void __user *)(unsigned long) tmp.oldval,
                    oldlenp,
                    (void __user *)(unsigned long) tmp.newval,
                    tmp.newlen);
      unlock_kernel();
      if (oldlenp) {
            if (!error) {
                  if (get_user(oldlen, (size_t __user *)addr) ||
                      put_user(oldlen, (u32 __user *)(unsigned long) tmp.oldlenp))
                        error = -EFAULT;
            }
            if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
                  error = -EFAULT;
      }
      return error;
#endif
}

long sys32_lookup_dcookie(unsigned long cookie_high,
                    unsigned long cookie_low,
                    char __user *buf, size_t len)
{
      return sys_lookup_dcookie((cookie_high << 32) | cookie_low,
                          buf, len);
}

long compat_sync_file_range(int fd, unsigned long off_high, unsigned long off_low, unsigned long nb_high, unsigned long nb_low, int flags)
{
      return sys_sync_file_range(fd,
                           (off_high << 32) | off_low,
                           (nb_high << 32) | nb_low,
                           flags);
}

asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
                             u32 lenhi, u32 lenlo)
{
      return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
                       ((loff_t)lenhi << 32) | lenlo);
}

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