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/config.h>
  13 #include <linux/compat.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/fs.h>
  17 #include <linux/mm.h>
  18 #include <linux/file.h>
  19 #include <linux/signal.h>
  20 #include <linux/resource.h>
  21 #include <linux/times.h>
  22 #include <linux/utsname.h>
  23 #include <linux/time.h>
  24 #include <linux/timex.h>
  25 #include <linux/smp.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/sem.h>
  28 #include <linux/msg.h>
  29 #include <linux/shm.h>
  30 #include <linux/slab.h>
  31 #include <linux/uio.h>
  32 #include <linux/nfs_fs.h>
  33 #include <linux/ncp_fs.h>
  34 #include <linux/sunrpc/svc.h>
  35 #include <linux/nfsd/nfsd.h>
  36 #include <linux/nfsd/cache.h>
  37 #include <linux/nfsd/xdr.h>
  38 #include <linux/nfsd/syscall.h>
  39 #include <linux/poll.h>
  40 #include <linux/personality.h>
  41 #include <linux/stat.h>
  42 #include <linux/highmem.h>
  43 #include <linux/highuid.h>
  44 #include <linux/mman.h>
  45 #include <linux/binfmts.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/ptrace.h>
  49 #include <linux/swap.h>
  50 #include <linux/syscalls.h>
  51
  52 #include <asm/types.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/semaphore.h>
  55 #include <asm/mmu_context.h>
  56
  57 #include "sys32.h"
  58
  59 #undef DEBUG
  60
  61 #ifdef DEBUG
  62 #define DBG(x)  printk x
  63 #else
  64 #define DBG(x)
  65 #endif
  66
  67 /*
  68  * sys32_execve() executes a new program.
  69  */
  70
  71 asmlinkage int sys32_execve(struct pt_regs *regs)
  72 {
  73         int error;
  74         char *filename;
  75
  76         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  77         filename = getname((const char __user *) regs->gr[26]);
  78         error = PTR_ERR(filename);
  79         if (IS_ERR(filename))
  80                 goto out;
  81         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  82                                  compat_ptr(regs->gr[24]), regs);
  83         if (error == 0) {
  84                 task_lock(current);
  85                 current->ptrace &= ~PT_DTRACE;
  86                 task_unlock(current);
  87         }
  88         putname(filename);
  89 out:
  90
  91         return error;
  92 }
  93
  94 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  95         int r22, int r21, int r20)
  96 {
  97     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  98         current->comm, current->pid, r20);
  99     return -ENOSYS;
 100 }
 101
 102 #ifdef CONFIG_SYSCTL
 103
 104 struct __sysctl_args32 {
 105         u32 name;
 106         int nlen;
 107         u32 oldval;
 108         u32 oldlenp;
 109         u32 newval;
 110         u32 newlen;
 111         u32 __unused[4];
 112 };
 113
 114 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 115 {
 116         struct __sysctl_args32 tmp;
 117         int error;
 118         unsigned int oldlen32;
 119         size_t oldlen, *oldlenp = NULL;
 120         unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
 121         extern int do_sysctl(int *name, int nlen, void *oldval, size_t *oldlenp,
 122                void *newval, size_t newlen);
 123
 124         DBG(("sysctl32(%p)\n", args));
 125
 126         if (copy_from_user(&tmp, args, sizeof(tmp)))
 127                 return -EFAULT;
 128
 129         if (tmp.oldval && tmp.oldlenp) {
 130                 /* Duh, this is ugly and might not work if sysctl_args
 131                    is in read-only memory, but do_sysctl does indirectly
 132                    a lot of uaccess in both directions and we'd have to
 133                    basically copy the whole sysctl.c here, and
 134                    glibc's __sysctl uses rw memory for the structure
 135                    anyway.  */
 136                 /* a possibly better hack than this, which will avoid the
 137                  * problem if the struct is read only, is to push the
 138                  * 'oldlen' value out to the user's stack instead. -PB
 139                  */
 140                 if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 141                         return -EFAULT;
 142                 oldlen = oldlen32;
 143                 if (put_user(oldlen, (size_t *)addr))
 144                         return -EFAULT;
 145                 oldlenp = (size_t *)addr;
 146         }
 147
 148         lock_kernel();
 149         error = do_sysctl((int *)(u64)tmp.name, tmp.nlen, (void *)(u64)tmp.oldval,
 150                           oldlenp, (void *)(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[0], tmp.__unused, sizeof(tmp.__unused)))
 163                         error = -EFAULT;
 164         }
 165         return error;
 166 }
 167
 168 #endif /* CONFIG_SYSCTL */
 169
 170 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
 171         struct compat_timespec __user *interval)
 172 {
 173         struct timespec t;
 174         int ret;
 175
 176         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 177         if (put_compat_timespec(&t, interval))
 178                 return -EFAULT;
 179         return ret;
 180 }
 181
 182 static int
 183 put_compat_timeval(struct compat_timeval __user *u, struct timeval *t)
 184 {
 185         struct compat_timeval t32;
 186         t32.tv_sec = t->tv_sec;
 187         t32.tv_usec = t->tv_usec;
 188         return copy_to_user(u, &t32, sizeof t32);
 189 }
 190
 191 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 192 {
 193         long usec;
 194
 195         if (__get_user(o->tv_sec, &i->tv_sec))
 196                 return -EFAULT;
 197         if (__get_user(usec, &i->tv_usec))
 198                 return -EFAULT;
 199         o->tv_nsec = usec * 1000;
 200         return 0;
 201 }
 202
 203 asmlinkage int
 204 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 205 {
 206     extern void do_gettimeofday(struct timeval *tv);
 207
 208     if (tv) {
 209             struct timeval ktv;
 210             do_gettimeofday(&ktv);
 211             if (put_compat_timeval(tv, &ktv))
 212                     return -EFAULT;
 213     }
 214     if (tz) {
 215             extern struct timezone sys_tz;
 216             if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 217                     return -EFAULT;
 218     }
 219     return 0;
 220 }
 221
 222 asmlinkage
 223 int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 224 {
 225         struct timespec kts;
 226         struct timezone ktz;
 227
 228         if (tv) {
 229                 if (get_ts32(&kts, tv))
 230                         return -EFAULT;
 231         }
 232         if (tz) {
 233                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 234                         return -EFAULT;
 235         }
 236
 237         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 238 }
 239
 240 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
 241 {
 242         int err;
 243
 244         if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
 245             !new_valid_dev(stat->rdev))
 246                 return -EOVERFLOW;
 247
 248         err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
 249         err |= put_user(stat->ino, &statbuf->st_ino);
 250         err |= put_user(stat->mode, &statbuf->st_mode);
 251         err |= put_user(stat->nlink, &statbuf->st_nlink);
 252         err |= put_user(0, &statbuf->st_reserved1);
 253         err |= put_user(0, &statbuf->st_reserved2);
 254         err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
 255         err |= put_user(stat->size, &statbuf->st_size);
 256         err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
 257         err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 258         err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 259         err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 260         err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 261         err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 262         err |= put_user(stat->blksize, &statbuf->st_blksize);
 263         err |= put_user(stat->blocks, &statbuf->st_blocks);
 264         err |= put_user(0, &statbuf->__unused1);
 265         err |= put_user(0, &statbuf->__unused2);
 266         err |= put_user(0, &statbuf->__unused3);
 267         err |= put_user(0, &statbuf->__unused4);
 268         err |= put_user(0, &statbuf->__unused5);
 269         err |= put_user(0, &statbuf->st_fstype); /* not avail */
 270         err |= put_user(0, &statbuf->st_realdev); /* not avail */
 271         err |= put_user(0, &statbuf->st_basemode); /* not avail */
 272         err |= put_user(0, &statbuf->st_spareshort);
 273         err |= put_user(stat->uid, &statbuf->st_uid);
 274         err |= put_user(stat->gid, &statbuf->st_gid);
 275         err |= put_user(0, &statbuf->st_spare4[0]);
 276         err |= put_user(0, &statbuf->st_spare4[1]);
 277         err |= put_user(0, &statbuf->st_spare4[2]);
 278
 279         return err;
 280 }
 281
 282 struct linux32_dirent {
 283         u32             d_ino;
 284         compat_off_t    d_off;
 285         u16             d_reclen;
 286         char            d_name[1];
 287 };
 288
 289 struct old_linux32_dirent {
 290         u32     d_ino;
 291         u32     d_offset;
 292         u16     d_namlen;
 293         char    d_name[1];
 294 };
 295
 296 struct getdents32_callback {
 297         struct linux32_dirent __user * current_dir;
 298         struct linux32_dirent __user * previous;
 299         int count;
 300         int error;
 301 };
 302
 303 struct readdir32_callback {
 304         struct old_linux32_dirent __user * dirent;
 305         int count;
 306 };
 307
 308 #define ROUND_UP(x,a)   ((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))
 309 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
 310 static int
 311 filldir32 (void *__buf, const char *name, int namlen, loff_t offset, ino_t ino,
 312            unsigned int d_type)
 313 {
 314         struct linux32_dirent __user * dirent;
 315         struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
 316         int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1, 4);
 317
 318         buf->error = -EINVAL;   /* only used if we fail.. */
 319         if (reclen > buf->count)
 320                 return -EINVAL;
 321         dirent = buf->previous;
 322         if (dirent)
 323                 put_user(offset, &dirent->d_off);
 324         dirent = buf->current_dir;
 325         buf->previous = dirent;
 326         put_user(ino, &dirent->d_ino);
 327         put_user(reclen, &dirent->d_reclen);
 328         copy_to_user(dirent->d_name, name, namlen);
 329         put_user(0, dirent->d_name + namlen);
 330         dirent = ((void __user *)dirent) + reclen;
 331         buf->current_dir = dirent;
 332         buf->count -= reclen;
 333         return 0;
 334 }
 335
 336 asmlinkage long
 337 sys32_getdents (unsigned int fd, void __user * dirent, unsigned int count)
 338 {
 339         struct file * file;
 340         struct linux32_dirent __user * lastdirent;
 341         struct getdents32_callback buf;
 342         int error;
 343
 344         error = -EBADF;
 345         file = fget(fd);
 346         if (!file)
 347                 goto out;
 348
 349         buf.current_dir = (struct linux32_dirent __user *) dirent;
 350         buf.previous = NULL;
 351         buf.count = count;
 352         buf.error = 0;
 353
 354         error = vfs_readdir(file, filldir32, &buf);
 355         if (error < 0)
 356                 goto out_putf;
 357         error = buf.error;
 358         lastdirent = buf.previous;
 359         if (lastdirent) {
 360                 put_user(file->f_pos, &lastdirent->d_off);
 361                 error = count - buf.count;
 362         }
 363
 364 out_putf:
 365         fput(file);
 366 out:
 367         return error;
 368 }
 369
 370 static int
 371 fillonedir32 (void * __buf, const char * name, int namlen, loff_t offset, ino_t ino,
 372               unsigned int d_type)
 373 {
 374         struct readdir32_callback * buf = (struct readdir32_callback *) __buf;
 375         struct old_linux32_dirent __user * dirent;
 376
 377         if (buf->count)
 378                 return -EINVAL;
 379         buf->count++;
 380         dirent = buf->dirent;
 381         put_user(ino, &dirent->d_ino);
 382         put_user(offset, &dirent->d_offset);
 383         put_user(namlen, &dirent->d_namlen);
 384         copy_to_user(dirent->d_name, name, namlen);
 385         put_user(0, dirent->d_name + namlen);
 386         return 0;
 387 }
 388
 389 asmlinkage long
 390 sys32_readdir (unsigned int fd, void __user * dirent, unsigned int count)
 391 {
 392         int error;
 393         struct file * file;
 394         struct readdir32_callback buf;
 395
 396         error = -EBADF;
 397         file = fget(fd);
 398         if (!file)
 399                 goto out;
 400
 401         buf.count = 0;
 402         buf.dirent = dirent;
 403
 404         error = vfs_readdir(file, fillonedir32, &buf);
 405         if (error >= 0)
 406                 error = buf.count;
 407         fput(file);
 408 out:
 409         return error;
 410 }
 411
 412 /*** copied from mips64 ***/
 413 /*
 414  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 415  * 64-bit unsigned longs.
 416  */
 417
 418 static inline int
 419 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 420 {
 421         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 422         if (ufdset) {
 423                 unsigned long odd;
 424
 425                 if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
 426                         return -EFAULT;
 427
 428                 odd = n & 1UL;
 429                 n &= ~1UL;
 430                 while (n) {
 431                         unsigned long h, l;
 432                         __get_user(l, ufdset);
 433                         __get_user(h, ufdset+1);
 434                         ufdset += 2;
 435                         *fdset++ = h << 32 | l;
 436                         n -= 2;
 437                 }
 438                 if (odd)
 439                         __get_user(*fdset, ufdset);
 440         } else {
 441                 /* Tricky, must clear full unsigned long in the
 442                  * kernel fdset at the end, this makes sure that
 443                  * actually happens.
 444                  */
 445                 memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
 446         }
 447         return 0;
 448 }
 449
 450 static inline void
 451 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 452 {
 453         unsigned long odd;
 454         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 455
 456         if (!ufdset)
 457                 return;
 458
 459         odd = n & 1UL;
 460         n &= ~1UL;
 461         while (n) {
 462                 unsigned long h, l;
 463                 l = *fdset++;
 464                 h = l >> 32;
 465                 __put_user(l, ufdset);
 466                 __put_user(h, ufdset+1);
 467                 ufdset += 2;
 468                 n -= 2;
 469         }
 470         if (odd)
 471                 __put_user(*fdset, ufdset);
 472 }
 473
 474 struct msgbuf32 {
 475     int mtype;
 476     char mtext[1];
 477 };
 478
 479 asmlinkage long sys32_msgsnd(int msqid,
 480                                 struct msgbuf32 __user *umsgp32,
 481                                 size_t msgsz, int msgflg)
 482 {
 483         struct msgbuf *mb;
 484         struct msgbuf32 mb32;
 485         int err;
 486
 487         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 488                 return -ENOMEM;
 489
 490         err = get_user(mb32.mtype, &umsgp32->mtype);
 491         mb->mtype = mb32.mtype;
 492         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 493
 494         if (err)
 495                 err = -EFAULT;
 496         else
 497                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 498
 499         kfree(mb);
 500         return err;
 501 }
 502
 503 asmlinkage long sys32_msgrcv(int msqid,
 504                                 struct msgbuf32 __user *umsgp32,
 505                                 size_t msgsz, long msgtyp, int msgflg)
 506 {
 507         struct msgbuf *mb;
 508         struct msgbuf32 mb32;
 509         int err, len;
 510
 511         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 512                 return -ENOMEM;
 513
 514         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 515
 516         if (err >= 0) {
 517                 len = err;
 518                 mb32.mtype = mb->mtype;
 519                 err = put_user(mb32.mtype, &umsgp32->mtype);
 520                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 521                 if (err)
 522                         err = -EFAULT;
 523                 else
 524                         err = len;
 525         }
 526
 527         kfree(mb);
 528         return err;
 529 }
 530
 531 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 532 {
 533         mm_segment_t old_fs = get_fs();
 534         int ret;
 535         off_t of;
 536
 537         if (offset && get_user(of, offset))
 538                 return -EFAULT;
 539
 540         set_fs(KERNEL_DS);
 541         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 542         set_fs(old_fs);
 543
 544         if (offset && put_user(of, offset))
 545                 return -EFAULT;
 546
 547         return ret;
 548 }
 549
 550 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 551 {
 552         mm_segment_t old_fs = get_fs();
 553         int ret;
 554         loff_t lof;
 555
 556         if (offset && get_user(lof, offset))
 557                 return -EFAULT;
 558
 559         set_fs(KERNEL_DS);
 560         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 561         set_fs(old_fs);
 562
 563         if (offset && put_user(lof, offset))
 564                 return -EFAULT;
 565
 566         return ret;
 567 }
 568
 569
 570 struct timex32 {
 571         unsigned int modes;     /* mode selector */
 572         int offset;             /* time offset (usec) */
 573         int freq;               /* frequency offset (scaled ppm) */
 574         int maxerror;           /* maximum error (usec) */
 575         int esterror;           /* estimated error (usec) */
 576         int status;             /* clock command/status */
 577         int constant;           /* pll time constant */
 578         int precision;          /* clock precision (usec) (read only) */
 579         int tolerance;          /* clock frequency tolerance (ppm)
 580                                  * (read only)
 581                                  */
 582         struct compat_timeval time;     /* (read only) */
 583         int tick;               /* (modified) usecs between clock ticks */
 584
 585         int ppsfreq;           /* pps frequency (scaled ppm) (ro) */
 586         int jitter;            /* pps jitter (us) (ro) */
 587         int shift;              /* interval duration (s) (shift) (ro) */
 588         int stabil;            /* pps stability (scaled ppm) (ro) */
 589         int jitcnt;            /* jitter limit exceeded (ro) */
 590         int calcnt;            /* calibration intervals (ro) */
 591         int errcnt;            /* calibration errors (ro) */
 592         int stbcnt;            /* stability limit exceeded (ro) */
 593
 594         int  :32; int  :32; int  :32; int  :32;
 595         int  :32; int  :32; int  :32; int  :32;
 596         int  :32; int  :32; int  :32; int  :32;
 597 };
 598
 599 asmlinkage long sys32_adjtimex(struct timex32 __user *txc_p32)
 600 {
 601         struct timex txc;
 602         struct timex32 t32;
 603         int ret;
 604         extern int do_adjtimex(struct timex *txc);
 605
 606         if(copy_from_user(&t32, txc_p32, sizeof(struct timex32)))
 607                 return -EFAULT;
 608 #undef CP
 609 #define CP(x) txc.x = t32.x
 610         CP(modes); CP(offset); CP(freq); CP(maxerror); CP(esterror);
 611         CP(status); CP(constant); CP(precision); CP(tolerance);
 612         CP(time.tv_sec); CP(time.tv_usec); CP(tick); CP(ppsfreq); CP(jitter);
 613         CP(shift); CP(stabil); CP(jitcnt); CP(calcnt); CP(errcnt);
 614         CP(stbcnt);
 615         ret = do_adjtimex(&txc);
 616 #undef CP
 617 #define CP(x) t32.x = txc.x
 618         CP(modes); CP(offset); CP(freq); CP(maxerror); CP(esterror);
 619         CP(status); CP(constant); CP(precision); CP(tolerance);
 620         CP(time.tv_sec); CP(time.tv_usec); CP(tick); CP(ppsfreq); CP(jitter);
 621         CP(shift); CP(stabil); CP(jitcnt); CP(calcnt); CP(errcnt);
 622         CP(stbcnt);
 623         return copy_to_user(txc_p32, &t32, sizeof(struct timex32)) ? -EFAULT : ret;
 624 }
 625
 626
 627 struct sysinfo32 {
 628         s32 uptime;
 629         u32 loads[3];
 630         u32 totalram;
 631         u32 freeram;
 632         u32 sharedram;
 633         u32 bufferram;
 634         u32 totalswap;
 635         u32 freeswap;
 636         unsigned short procs;
 637         u32 totalhigh;
 638         u32 freehigh;
 639         u32 mem_unit;
 640         char _f[12];
 641 };
 642
 643 /* We used to call sys_sysinfo and translate the result.  But sys_sysinfo
 644  * undoes the good work done elsewhere, and rather than undoing the
 645  * damage, I decided to just duplicate the code from sys_sysinfo here.
 646  */
 647
 648 asmlinkage int sys32_sysinfo(struct sysinfo32 __user *info)
 649 {
 650         struct sysinfo val;
 651         int err;
 652         unsigned long seq;
 653
 654         /* We don't need a memset here because we copy the
 655          * struct to userspace once element at a time.
 656          */
 657
 658         do {
 659                 seq = read_seqbegin(&xtime_lock);
 660                 val.uptime = jiffies / HZ;
 661
 662                 val.loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
 663                 val.loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
 664                 val.loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);
 665
 666                 val.procs = nr_threads;
 667         } while (read_seqretry(&xtime_lock, seq));
 668
 669
 670         si_meminfo(&val);
 671         si_swapinfo(&val);
 672
 673         err = put_user (val.uptime, &info->uptime);
 674         err |= __put_user (val.loads[0], &info->loads[0]);
 675         err |= __put_user (val.loads[1], &info->loads[1]);
 676         err |= __put_user (val.loads[2], &info->loads[2]);
 677         err |= __put_user (val.totalram, &info->totalram);
 678         err |= __put_user (val.freeram, &info->freeram);
 679         err |= __put_user (val.sharedram, &info->sharedram);
 680         err |= __put_user (val.bufferram, &info->bufferram);
 681         err |= __put_user (val.totalswap, &info->totalswap);
 682         err |= __put_user (val.freeswap, &info->freeswap);
 683         err |= __put_user (val.procs, &info->procs);
 684         err |= __put_user (val.totalhigh, &info->totalhigh);
 685         err |= __put_user (val.freehigh, &info->freehigh);
 686         err |= __put_user (val.mem_unit, &info->mem_unit);
 687         return err ? -EFAULT : 0;
 688 }
 689
 690
 691 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 692  * half of the argument has been zeroed by syscall.S.
 693  */
 694
 695 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 696 {
 697         return sys_lseek(fd, offset, origin);
 698 }
 699
 700 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 701 {
 702         union semun u;
 703
 704         if (cmd == SETVAL) {
 705                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 706                  * The int should be in the first 4, but our argument
 707                  * frobbing has left it in the last 4.
 708                  */
 709                 u.val = *((int *)&arg + 1);
 710                 return sys_semctl (semid, semnum, cmd, u);
 711         }
 712         return sys_semctl (semid, semnum, cmd, arg);
 713 }
 714
 715 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 716                           size_t len)
 717 {
 718         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 719                                   buf, len);
 720 }