arch/parisc/kernel/sys_parisc32.c

   1 /*
   2  * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
   3  *
   4  * Copyright (C) 2000-2001 Hewlett Packard Company
   5  * Copyright (C) 2000 John Marvin
   6  * Copyright (C) 2001 Matthew Wilcox
   7  *
   8  * These routines maintain argument size conversion between 32bit and 64bit
   9  * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
  10  */
  11
  12 #include <linux/compat.h>
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/fs.h>
  16 #include <linux/mm.h>
  17 #include <linux/file.h>
  18 #include <linux/signal.h>
  19 #include <linux/resource.h>
  20 #include <linux/times.h>
  21 #include <linux/utsname.h>
  22 #include <linux/time.h>
  23 #include <linux/smp.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/sem.h>
  26 #include <linux/msg.h>
  27 #include <linux/shm.h>
  28 #include <linux/slab.h>
  29 #include <linux/uio.h>
  30 #include <linux/nfs_fs.h>
  31 #include <linux/ncp_fs.h>
  32 #include <linux/sunrpc/svc.h>
  33 #include <linux/nfsd/nfsd.h>
  34 #include <linux/nfsd/cache.h>
  35 #include <linux/nfsd/xdr.h>
  36 #include <linux/nfsd/syscall.h>
  37 #include <linux/poll.h>
  38 #include <linux/personality.h>
  39 #include <linux/stat.h>
  40 #include <linux/highmem.h>
  41 #include <linux/highuid.h>
  42 #include <linux/mman.h>
  43 #include <linux/binfmts.h>
  44 #include <linux/namei.h>
  45 #include <linux/vfs.h>
  46 #include <linux/ptrace.h>
  47 #include <linux/swap.h>
  48 #include <linux/syscalls.h>
  49
  50 #include <asm/types.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/semaphore.h>
  53 #include <asm/mmu_context.h>
  54
  55 #include "sys32.h"
  56
  57 #undef DEBUG
  58
  59 #ifdef DEBUG
  60 #define DBG(x)  printk x
  61 #else
  62 #define DBG(x)
  63 #endif
  64
  65 /*
  66  * sys32_execve() executes a new program.
  67  */
  68
  69 asmlinkage int sys32_execve(struct pt_regs *regs)
  70 {
  71         int error;
  72         char *filename;
  73
  74         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  75         filename = getname((const char __user *) regs->gr[26]);
  76         error = PTR_ERR(filename);
  77         if (IS_ERR(filename))
  78                 goto out;
  79         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  80                                  compat_ptr(regs->gr[24]), regs);
  81         if (error == 0) {
  82                 task_lock(current);
  83                 current->ptrace &= ~PT_DTRACE;
  84                 task_unlock(current);
  85         }
  86         putname(filename);
  87 out:
  88
  89         return error;
  90 }
  91
  92 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  93         int r22, int r21, int r20)
  94 {
  95     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  96         current->comm, current->pid, r20);
  97     return -ENOSYS;
  98 }
  99
 100 #ifdef CONFIG_SYSCTL
 101
 102 struct __sysctl_args32 {
 103         u32 name;
 104         int nlen;
 105         u32 oldval;
 106         u32 oldlenp;
 107         u32 newval;
 108         u32 newlen;
 109         u32 __unused[4];
 110 };
 111
 112 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 113 {
 114 #ifndef CONFIG_SYSCTL_SYSCALL
 115         return -ENOSYS;
 116 #else
 117         struct __sysctl_args32 tmp;
 118         int error;
 119         unsigned int oldlen32;
 120         size_t oldlen, __user *oldlenp = NULL;
 121         unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
 122
 123         DBG(("sysctl32(%p)\n", args));
 124
 125         if (copy_from_user(&tmp, args, sizeof(tmp)))
 126                 return -EFAULT;
 127
 128         if (tmp.oldval && tmp.oldlenp) {
 129                 /* Duh, this is ugly and might not work if sysctl_args
 130                    is in read-only memory, but do_sysctl does indirectly
 131                    a lot of uaccess in both directions and we'd have to
 132                    basically copy the whole sysctl.c here, and
 133                    glibc's __sysctl uses rw memory for the structure
 134                    anyway.  */
 135                 /* a possibly better hack than this, which will avoid the
 136                  * problem if the struct is read only, is to push the
 137                  * 'oldlen' value out to the user's stack instead. -PB
 138                  */
 139                 if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 140                         return -EFAULT;
 141                 oldlen = oldlen32;
 142                 if (put_user(oldlen, (size_t *)addr))
 143                         return -EFAULT;
 144                 oldlenp = (size_t *)addr;
 145         }
 146
 147         lock_kernel();
 148         error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
 149                           (void __user *)(u64)tmp.oldval, oldlenp,
 150                           (void __user *)(u64)tmp.newval, tmp.newlen);
 151         unlock_kernel();
 152         if (oldlenp) {
 153                 if (!error) {
 154                         if (get_user(oldlen, (size_t *)addr)) {
 155                                 error = -EFAULT;
 156                         } else {
 157                                 oldlen32 = oldlen;
 158                                 if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 159                                         error = -EFAULT;
 160                         }
 161                 }
 162                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 163                         error = -EFAULT;
 164         }
 165         return error;
 166 #endif
 167 }
 168
 169 #endif /* CONFIG_SYSCTL */
 170
 171 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
 172         struct compat_timespec __user *interval)
 173 {
 174         struct timespec t;
 175         int ret;
 176
 177         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 178         if (put_compat_timespec(&t, interval))
 179                 return -EFAULT;
 180         return ret;
 181 }
 182
 183 static int
 184 put_compat_timeval(struct compat_timeval __user *u, struct timeval *t)
 185 {
 186         struct compat_timeval t32;
 187         t32.tv_sec = t->tv_sec;
 188         t32.tv_usec = t->tv_usec;
 189         return copy_to_user(u, &t32, sizeof t32);
 190 }
 191
 192 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 193 {
 194         long usec;
 195
 196         if (__get_user(o->tv_sec, &i->tv_sec))
 197                 return -EFAULT;
 198         if (__get_user(usec, &i->tv_usec))
 199                 return -EFAULT;
 200         o->tv_nsec = usec * 1000;
 201         return 0;
 202 }
 203
 204 asmlinkage int
 205 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 206 {
 207     extern void do_gettimeofday(struct timeval *tv);
 208
 209     if (tv) {
 210             struct timeval ktv;
 211             do_gettimeofday(&ktv);
 212             if (put_compat_timeval(tv, &ktv))
 213                     return -EFAULT;
 214     }
 215     if (tz) {
 216             extern struct timezone sys_tz;
 217             if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 218                     return -EFAULT;
 219     }
 220     return 0;
 221 }
 222
 223 asmlinkage
 224 int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 225 {
 226         struct timespec kts;
 227         struct timezone ktz;
 228
 229         if (tv) {
 230                 if (get_ts32(&kts, tv))
 231                         return -EFAULT;
 232         }
 233         if (tz) {
 234                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 235                         return -EFAULT;
 236         }
 237
 238         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 239 }
 240
 241 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
 242 {
 243         compat_ino_t ino;
 244         int err;
 245
 246         if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
 247             !new_valid_dev(stat->rdev))
 248                 return -EOVERFLOW;
 249
 250         ino = stat->ino;
 251         if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
 252                 return -EOVERFLOW;
 253
 254         err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
 255         err |= put_user(ino, &statbuf->st_ino);
 256         err |= put_user(stat->mode, &statbuf->st_mode);
 257         err |= put_user(stat->nlink, &statbuf->st_nlink);
 258         err |= put_user(0, &statbuf->st_reserved1);
 259         err |= put_user(0, &statbuf->st_reserved2);
 260         err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
 261         err |= put_user(stat->size, &statbuf->st_size);
 262         err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
 263         err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 264         err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 265         err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 266         err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 267         err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 268         err |= put_user(stat->blksize, &statbuf->st_blksize);
 269         err |= put_user(stat->blocks, &statbuf->st_blocks);
 270         err |= put_user(0, &statbuf->__unused1);
 271         err |= put_user(0, &statbuf->__unused2);
 272         err |= put_user(0, &statbuf->__unused3);
 273         err |= put_user(0, &statbuf->__unused4);
 274         err |= put_user(0, &statbuf->__unused5);
 275         err |= put_user(0, &statbuf->st_fstype); /* not avail */
 276         err |= put_user(0, &statbuf->st_realdev); /* not avail */
 277         err |= put_user(0, &statbuf->st_basemode); /* not avail */
 278         err |= put_user(0, &statbuf->st_spareshort);
 279         err |= put_user(stat->uid, &statbuf->st_uid);
 280         err |= put_user(stat->gid, &statbuf->st_gid);
 281         err |= put_user(0, &statbuf->st_spare4[0]);
 282         err |= put_user(0, &statbuf->st_spare4[1]);
 283         err |= put_user(0, &statbuf->st_spare4[2]);
 284
 285         return err;
 286 }
 287
 288 struct linux32_dirent {
 289         u32             d_ino;
 290         compat_off_t    d_off;
 291         u16             d_reclen;
 292         char            d_name[1];
 293 };
 294
 295 struct old_linux32_dirent {
 296         u32     d_ino;
 297         u32     d_offset;
 298         u16     d_namlen;
 299         char    d_name[1];
 300 };
 301
 302 struct getdents32_callback {
 303         struct linux32_dirent __user * current_dir;
 304         struct linux32_dirent __user * previous;
 305         int count;
 306         int error;
 307 };
 308
 309 struct readdir32_callback {
 310         struct old_linux32_dirent __user * dirent;
 311         int count;
 312 };
 313
 314 #define ROUND_UP(x,a)   ((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))
 315 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
 316 static int filldir32 (void *__buf, const char *name, int namlen,
 317                         loff_t offset, u64 ino, unsigned int d_type)
 318 {
 319         struct linux32_dirent __user * dirent;
 320         struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
 321         int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1, 4);
 322         u32 d_ino;
 323
 324         buf->error = -EINVAL;   /* only used if we fail.. */
 325         if (reclen > buf->count)
 326                 return -EINVAL;
 327         d_ino = ino;
 328         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
 329                 return -EOVERFLOW;
 330         dirent = buf->previous;
 331         if (dirent)
 332                 put_user(offset, &dirent->d_off);
 333         dirent = buf->current_dir;
 334         buf->previous = dirent;
 335         put_user(d_ino, &dirent->d_ino);
 336         put_user(reclen, &dirent->d_reclen);
 337         copy_to_user(dirent->d_name, name, namlen);
 338         put_user(0, dirent->d_name + namlen);
 339         dirent = ((void __user *)dirent) + reclen;
 340         buf->current_dir = dirent;
 341         buf->count -= reclen;
 342         return 0;
 343 }
 344
 345 asmlinkage long
 346 sys32_getdents (unsigned int fd, void __user * dirent, unsigned int count)
 347 {
 348         struct file * file;
 349         struct linux32_dirent __user * lastdirent;
 350         struct getdents32_callback buf;
 351         int error;
 352
 353         error = -EBADF;
 354         file = fget(fd);
 355         if (!file)
 356                 goto out;
 357
 358         buf.current_dir = (struct linux32_dirent __user *) dirent;
 359         buf.previous = NULL;
 360         buf.count = count;
 361         buf.error = 0;
 362
 363         error = vfs_readdir(file, filldir32, &buf);
 364         if (error < 0)
 365                 goto out_putf;
 366         error = buf.error;
 367         lastdirent = buf.previous;
 368         if (lastdirent) {
 369                 put_user(file->f_pos, &lastdirent->d_off);
 370                 error = count - buf.count;
 371         }
 372
 373 out_putf:
 374         fput(file);
 375 out:
 376         return error;
 377 }
 378
 379 static int fillonedir32(void * __buf, const char * name, int namlen,
 380                         loff_t offset, u64 ino, unsigned int d_type)
 381 {
 382         struct readdir32_callback * buf = (struct readdir32_callback *) __buf;
 383         struct old_linux32_dirent __user * dirent;
 384         u32 d_ino;
 385
 386         if (buf->count)
 387                 return -EINVAL;
 388         d_ino = ino;
 389         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
 390                 return -EOVERFLOW;
 391         buf->count++;
 392         dirent = buf->dirent;
 393         put_user(d_ino, &dirent->d_ino);
 394         put_user(offset, &dirent->d_offset);
 395         put_user(namlen, &dirent->d_namlen);
 396         copy_to_user(dirent->d_name, name, namlen);
 397         put_user(0, dirent->d_name + namlen);
 398         return 0;
 399 }
 400
 401 asmlinkage long
 402 sys32_readdir (unsigned int fd, void __user * dirent, unsigned int count)
 403 {
 404         int error;
 405         struct file * file;
 406         struct readdir32_callback buf;
 407
 408         error = -EBADF;
 409         file = fget(fd);
 410         if (!file)
 411                 goto out;
 412
 413         buf.count = 0;
 414         buf.dirent = dirent;
 415
 416         error = vfs_readdir(file, fillonedir32, &buf);
 417         if (error >= 0)
 418                 error = buf.count;
 419         fput(file);
 420 out:
 421         return error;
 422 }
 423
 424 /*** copied from mips64 ***/
 425 /*
 426  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 427  * 64-bit unsigned longs.
 428  */
 429
 430 static inline int
 431 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 432 {
 433         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 434         if (ufdset) {
 435                 unsigned long odd;
 436
 437                 if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
 438                         return -EFAULT;
 439
 440                 odd = n & 1UL;
 441                 n &= ~1UL;
 442                 while (n) {
 443                         unsigned long h, l;
 444                         __get_user(l, ufdset);
 445                         __get_user(h, ufdset+1);
 446                         ufdset += 2;
 447                         *fdset++ = h << 32 | l;
 448                         n -= 2;
 449                 }
 450                 if (odd)
 451                         __get_user(*fdset, ufdset);
 452         } else {
 453                 /* Tricky, must clear full unsigned long in the
 454                  * kernel fdset at the end, this makes sure that
 455                  * actually happens.
 456                  */
 457                 memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
 458         }
 459         return 0;
 460 }
 461
 462 static inline void
 463 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 464 {
 465         unsigned long odd;
 466         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 467
 468         if (!ufdset)
 469                 return;
 470
 471         odd = n & 1UL;
 472         n &= ~1UL;
 473         while (n) {
 474                 unsigned long h, l;
 475                 l = *fdset++;
 476                 h = l >> 32;
 477                 __put_user(l, ufdset);
 478                 __put_user(h, ufdset+1);
 479                 ufdset += 2;
 480                 n -= 2;
 481         }
 482         if (odd)
 483                 __put_user(*fdset, ufdset);
 484 }
 485
 486 struct msgbuf32 {
 487     int mtype;
 488     char mtext[1];
 489 };
 490
 491 asmlinkage long sys32_msgsnd(int msqid,
 492                                 struct msgbuf32 __user *umsgp32,
 493                                 size_t msgsz, int msgflg)
 494 {
 495         struct msgbuf *mb;
 496         struct msgbuf32 mb32;
 497         int err;
 498
 499         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 500                 return -ENOMEM;
 501
 502         err = get_user(mb32.mtype, &umsgp32->mtype);
 503         mb->mtype = mb32.mtype;
 504         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 505
 506         if (err)
 507                 err = -EFAULT;
 508         else
 509                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 510
 511         kfree(mb);
 512         return err;
 513 }
 514
 515 asmlinkage long sys32_msgrcv(int msqid,
 516                                 struct msgbuf32 __user *umsgp32,
 517                                 size_t msgsz, long msgtyp, int msgflg)
 518 {
 519         struct msgbuf *mb;
 520         struct msgbuf32 mb32;
 521         int err, len;
 522
 523         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 524                 return -ENOMEM;
 525
 526         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 527
 528         if (err >= 0) {
 529                 len = err;
 530                 mb32.mtype = mb->mtype;
 531                 err = put_user(mb32.mtype, &umsgp32->mtype);
 532                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 533                 if (err)
 534                         err = -EFAULT;
 535                 else
 536                         err = len;
 537         }
 538
 539         kfree(mb);
 540         return err;
 541 }
 542
 543 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 544 {
 545         mm_segment_t old_fs = get_fs();
 546         int ret;
 547         off_t of;
 548
 549         if (offset && get_user(of, offset))
 550                 return -EFAULT;
 551
 552         set_fs(KERNEL_DS);
 553         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 554         set_fs(old_fs);
 555
 556         if (offset && put_user(of, offset))
 557                 return -EFAULT;
 558
 559         return ret;
 560 }
 561
 562 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 563 {
 564         mm_segment_t old_fs = get_fs();
 565         int ret;
 566         loff_t lof;
 567
 568         if (offset && get_user(lof, offset))
 569                 return -EFAULT;
 570
 571         set_fs(KERNEL_DS);
 572         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 573         set_fs(old_fs);
 574
 575         if (offset && put_user(lof, offset))
 576                 return -EFAULT;
 577
 578         return ret;
 579 }
 580
 581
 582 struct sysinfo32 {
 583         s32 uptime;
 584         u32 loads[3];
 585         u32 totalram;
 586         u32 freeram;
 587         u32 sharedram;
 588         u32 bufferram;
 589         u32 totalswap;
 590         u32 freeswap;
 591         unsigned short procs;
 592         u32 totalhigh;
 593         u32 freehigh;
 594         u32 mem_unit;
 595         char _f[12];
 596 };
 597
 598 /* We used to call sys_sysinfo and translate the result.  But sys_sysinfo
 599  * undoes the good work done elsewhere, and rather than undoing the
 600  * damage, I decided to just duplicate the code from sys_sysinfo here.
 601  */
 602
 603 asmlinkage int sys32_sysinfo(struct sysinfo32 __user *info)
 604 {
 605         struct sysinfo val;
 606         int err;
 607         unsigned long seq;
 608
 609         /* We don't need a memset here because we copy the
 610          * struct to userspace once element at a time.
 611          */
 612
 613         do {
 614                 seq = read_seqbegin(&xtime_lock);
 615                 val.uptime = jiffies / HZ;
 616
 617                 val.loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
 618                 val.loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
 619                 val.loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
 620
 621                 val.procs = nr_threads;
 622         } while (read_seqretry(&xtime_lock, seq));
 623
 624
 625         si_meminfo(&val);
 626         si_swapinfo(&val);
 627
 628         err = put_user (val.uptime, &info->uptime);
 629         err |= __put_user (val.loads[0], &info->loads[0]);
 630         err |= __put_user (val.loads[1], &info->loads[1]);
 631         err |= __put_user (val.loads[2], &info->loads[2]);
 632         err |= __put_user (val.totalram, &info->totalram);
 633         err |= __put_user (val.freeram, &info->freeram);
 634         err |= __put_user (val.sharedram, &info->sharedram);
 635         err |= __put_user (val.bufferram, &info->bufferram);
 636         err |= __put_user (val.totalswap, &info->totalswap);
 637         err |= __put_user (val.freeswap, &info->freeswap);
 638         err |= __put_user (val.procs, &info->procs);
 639         err |= __put_user (val.totalhigh, &info->totalhigh);
 640         err |= __put_user (val.freehigh, &info->freehigh);
 641         err |= __put_user (val.mem_unit, &info->mem_unit);
 642         return err ? -EFAULT : 0;
 643 }
 644
 645
 646 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 647  * half of the argument has been zeroed by syscall.S.
 648  */
 649
 650 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 651 {
 652         return sys_lseek(fd, offset, origin);
 653 }
 654
 655 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 656 {
 657         union semun u;
 658
 659         if (cmd == SETVAL) {
 660                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 661                  * The int should be in the first 4, but our argument
 662                  * frobbing has left it in the last 4.
 663                  */
 664                 u.val = *((int *)&arg + 1);
 665                 return sys_semctl (semid, semnum, cmd, u);
 666         }
 667         return sys_semctl (semid, semnum, cmd, arg);
 668 }
 669
 670 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 671                           size_t len)
 672 {
 673         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 674                                   buf, len);
 675 }