arch/powerpc/kernel/sys_ppc32.c

   1 /*
   2  * sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
   3  *
   4  * Copyright (C) 2001 IBM
   5  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   7  *
   8  * These routines maintain argument size conversion between 32bit and 64bit
   9  * environment.
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/fs.h>
  20 #include <linux/mm.h>
  21 #include <linux/file.h>
  22 #include <linux/signal.h>
  23 #include <linux/resource.h>
  24 #include <linux/times.h>
  25 #include <linux/utsname.h>
  26 #include <linux/smp.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/sem.h>
  29 #include <linux/msg.h>
  30 #include <linux/shm.h>
  31 #include <linux/poll.h>
  32 #include <linux/personality.h>
  33 #include <linux/stat.h>
  34 #include <linux/mman.h>
  35 #include <linux/in.h>
  36 #include <linux/syscalls.h>
  37 #include <linux/unistd.h>
  38 #include <linux/sysctl.h>
  39 #include <linux/binfmts.h>
  40 #include <linux/security.h>
  41 #include <linux/compat.h>
  42 #include <linux/ptrace.h>
  43 #include <linux/elf.h>
  44
  45 #include <asm/ptrace.h>
  46 #include <asm/types.h>
  47 #include <asm/ipc.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/unistd.h>
  50 #include <asm/semaphore.h>
  51 #include <asm/time.h>
  52 #include <asm/mmu_context.h>
  53 #include <asm/ppc-pci.h>
  54 #include <asm/syscalls.h>
  55
  56 /* readdir & getdents */
  57 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
  58 #define ROUND_UP(x) (((x)+sizeof(u32)-1) & ~(sizeof(u32)-1))
  59
  60 struct old_linux_dirent32 {
  61         u32             d_ino;
  62         u32             d_offset;
  63         unsigned short  d_namlen;
  64         char            d_name[1];
  65 };
  66
  67 struct readdir_callback32 {
  68         struct old_linux_dirent32 __user * dirent;
  69         int count;
  70 };
  71
  72 static int fillonedir(void * __buf, const char * name, int namlen,
  73                                   off_t offset, u64 ino, unsigned int d_type)
  74 {
  75         struct readdir_callback32 * buf = (struct readdir_callback32 *) __buf;
  76         struct old_linux_dirent32 __user * dirent;
  77         ino_t d_ino;
  78
  79         if (buf->count)
  80                 return -EINVAL;
  81         d_ino = ino;
  82         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
  83                 return -EOVERFLOW;
  84         buf->count++;
  85         dirent = buf->dirent;
  86         put_user(d_ino, &dirent->d_ino);
  87         put_user(offset, &dirent->d_offset);
  88         put_user(namlen, &dirent->d_namlen);
  89         copy_to_user(dirent->d_name, name, namlen);
  90         put_user(0, dirent->d_name + namlen);
  91         return 0;
  92 }
  93
  94 asmlinkage int old32_readdir(unsigned int fd, struct old_linux_dirent32 __user *dirent, unsigned int count)
  95 {
  96         int error = -EBADF;
  97         struct file * file;
  98         struct readdir_callback32 buf;
  99
 100         file = fget(fd);
 101         if (!file)
 102                 goto out;
 103
 104         buf.count = 0;
 105         buf.dirent = dirent;
 106
 107         error = vfs_readdir(file, (filldir_t)fillonedir, &buf);
 108         if (error < 0)
 109                 goto out_putf;
 110         error = buf.count;
 111
 112 out_putf:
 113         fput(file);
 114 out:
 115         return error;
 116 }
 117
 118 asmlinkage long ppc32_select(u32 n, compat_ulong_t __user *inp,
 119                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 120                 compat_uptr_t tvp_x)
 121 {
 122         /* sign extend n */
 123         return compat_sys_select((int)n, inp, outp, exp, compat_ptr(tvp_x));
 124 }
 125
 126 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
 127 {
 128         compat_ino_t ino;
 129         long err;
 130
 131         if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
 132             !new_valid_dev(stat->rdev))
 133                 return -EOVERFLOW;
 134
 135         ino = stat->ino;
 136         if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
 137                 return -EOVERFLOW;
 138
 139         err  = access_ok(VERIFY_WRITE, statbuf, sizeof(*statbuf)) ? 0 : -EFAULT;
 140         err |= __put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
 141         err |= __put_user(ino, &statbuf->st_ino);
 142         err |= __put_user(stat->mode, &statbuf->st_mode);
 143         err |= __put_user(stat->nlink, &statbuf->st_nlink);
 144         err |= __put_user(stat->uid, &statbuf->st_uid);
 145         err |= __put_user(stat->gid, &statbuf->st_gid);
 146         err |= __put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
 147         err |= __put_user(stat->size, &statbuf->st_size);
 148         err |= __put_user(stat->atime.tv_sec, &statbuf->st_atime);
 149         err |= __put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 150         err |= __put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 151         err |= __put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 152         err |= __put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 153         err |= __put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 154         err |= __put_user(stat->blksize, &statbuf->st_blksize);
 155         err |= __put_user(stat->blocks, &statbuf->st_blocks);
 156         err |= __put_user(0, &statbuf->__unused4[0]);
 157         err |= __put_user(0, &statbuf->__unused4[1]);
 158
 159         return err;
 160 }
 161
 162 /* Note: it is necessary to treat option as an unsigned int,
 163  * with the corresponding cast to a signed int to insure that the
 164  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 165  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 166  */
 167 asmlinkage long compat_sys_sysfs(u32 option, u32 arg1, u32 arg2)
 168 {
 169         return sys_sysfs((int)option, arg1, arg2);
 170 }
 171
 172 asmlinkage long compat_sys_pause(void)
 173 {
 174         current->state = TASK_INTERRUPTIBLE;
 175         schedule();
 176
 177         return -ERESTARTNOHAND;
 178 }
 179
 180 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 181 {
 182         long usec;
 183
 184         if (!access_ok(VERIFY_READ, i, sizeof(*i)))
 185                 return -EFAULT;
 186         if (__get_user(o->tv_sec, &i->tv_sec))
 187                 return -EFAULT;
 188         if (__get_user(usec, &i->tv_usec))
 189                 return -EFAULT;
 190         o->tv_nsec = usec * 1000;
 191         return 0;
 192 }
 193
 194 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
 195 {
 196         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 197                 (__put_user(i->tv_sec, &o->tv_sec) |
 198                  __put_user(i->tv_usec, &o->tv_usec)));
 199 }
 200
 201
 202
 203
 204 /* Translations due to time_t size differences.  Which affects all
 205    sorts of things, like timeval and itimerval.  */
 206 extern struct timezone sys_tz;
 207
 208 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 209 {
 210         if (tv) {
 211                 struct timeval ktv;
 212                 do_gettimeofday(&ktv);
 213                 if (put_tv32(tv, &ktv))
 214                         return -EFAULT;
 215         }
 216         if (tz) {
 217                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 218                         return -EFAULT;
 219         }
 220
 221         return 0;
 222 }
 223
 224
 225
 226 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 227 {
 228         struct timespec kts;
 229         struct timezone ktz;
 230
 231         if (tv) {
 232                 if (get_ts32(&kts, tv))
 233                         return -EFAULT;
 234         }
 235         if (tz) {
 236                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 237                         return -EFAULT;
 238         }
 239
 240         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 241 }
 242
 243 #ifdef CONFIG_SYSVIPC
 244 long compat_sys_ipc(u32 call, u32 first, u32 second, u32 third, compat_uptr_t ptr,
 245                u32 fifth)
 246 {
 247         int version;
 248
 249         version = call >> 16; /* hack for backward compatibility */
 250         call &= 0xffff;
 251
 252         switch (call) {
 253
 254         case SEMTIMEDOP:
 255                 if (fifth)
 256                         /* sign extend semid */
 257                         return compat_sys_semtimedop((int)first,
 258                                                      compat_ptr(ptr), second,
 259                                                      compat_ptr(fifth));
 260                 /* else fall through for normal semop() */
 261         case SEMOP:
 262                 /* struct sembuf is the same on 32 and 64bit :)) */
 263                 /* sign extend semid */
 264                 return sys_semtimedop((int)first, compat_ptr(ptr), second,
 265                                       NULL);
 266         case SEMGET:
 267                 /* sign extend key, nsems */
 268                 return sys_semget((int)first, (int)second, third);
 269         case SEMCTL:
 270                 /* sign extend semid, semnum */
 271                 return compat_sys_semctl((int)first, (int)second, third,
 272                                          compat_ptr(ptr));
 273
 274         case MSGSND:
 275                 /* sign extend msqid */
 276                 return compat_sys_msgsnd((int)first, (int)second, third,
 277                                          compat_ptr(ptr));
 278         case MSGRCV:
 279                 /* sign extend msqid, msgtyp */
 280                 return compat_sys_msgrcv((int)first, second, (int)fifth,
 281                                          third, version, compat_ptr(ptr));
 282         case MSGGET:
 283                 /* sign extend key */
 284                 return sys_msgget((int)first, second);
 285         case MSGCTL:
 286                 /* sign extend msqid */
 287                 return compat_sys_msgctl((int)first, second, compat_ptr(ptr));
 288
 289         case SHMAT:
 290                 /* sign extend shmid */
 291                 return compat_sys_shmat((int)first, second, third, version,
 292                                         compat_ptr(ptr));
 293         case SHMDT:
 294                 return sys_shmdt(compat_ptr(ptr));
 295         case SHMGET:
 296                 /* sign extend key_t */
 297                 return sys_shmget((int)first, second, third);
 298         case SHMCTL:
 299                 /* sign extend shmid */
 300                 return compat_sys_shmctl((int)first, second, compat_ptr(ptr));
 301
 302         default:
 303                 return -ENOSYS;
 304         }
 305
 306         return -ENOSYS;
 307 }
 308 #endif
 309
 310 /* Note: it is necessary to treat out_fd and in_fd as unsigned ints,
 311  * with the corresponding cast to a signed int to insure that the
 312  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 313  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 314  */
 315 asmlinkage long compat_sys_sendfile(u32 out_fd, u32 in_fd, compat_off_t __user * offset, u32 count)
 316 {
 317         mm_segment_t old_fs = get_fs();
 318         int ret;
 319         off_t of;
 320         off_t __user *up;
 321
 322         if (offset && get_user(of, offset))
 323                 return -EFAULT;
 324
 325         /* The __user pointer cast is valid because of the set_fs() */
 326         set_fs(KERNEL_DS);
 327         up = offset ? (off_t __user *) &of : NULL;
 328         ret = sys_sendfile((int)out_fd, (int)in_fd, up, count);
 329         set_fs(old_fs);
 330
 331         if (offset && put_user(of, offset))
 332                 return -EFAULT;
 333
 334         return ret;
 335 }
 336
 337 asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 338 {
 339         mm_segment_t old_fs = get_fs();
 340         int ret;
 341         loff_t lof;
 342         loff_t __user *up;
 343
 344         if (offset && get_user(lof, offset))
 345                 return -EFAULT;
 346
 347         /* The __user pointer cast is valid because of the set_fs() */
 348         set_fs(KERNEL_DS);
 349         up = offset ? (loff_t __user *) &lof : NULL;
 350         ret = sys_sendfile64(out_fd, in_fd, up, count);
 351         set_fs(old_fs);
 352
 353         if (offset && put_user(lof, offset))
 354                 return -EFAULT;
 355
 356         return ret;
 357 }
 358
 359 long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 360                   unsigned long a3, unsigned long a4, unsigned long a5,
 361                   struct pt_regs *regs)
 362 {
 363         int error;
 364         char * filename;
 365
 366         filename = getname((char __user *) a0);
 367         error = PTR_ERR(filename);
 368         if (IS_ERR(filename))
 369                 goto out;
 370         flush_fp_to_thread(current);
 371         flush_altivec_to_thread(current);
 372
 373         error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
 374
 375         if (error == 0) {
 376                 task_lock(current);
 377                 current->ptrace &= ~PT_DTRACE;
 378                 task_unlock(current);
 379         }
 380         putname(filename);
 381
 382 out:
 383         return error;
 384 }
 385
 386 /* Note: it is necessary to treat option as an unsigned int,
 387  * with the corresponding cast to a signed int to insure that the
 388  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 389  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 390  */
 391 asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3, u32 arg4, u32 arg5)
 392 {
 393         return sys_prctl((int)option,
 394                          (unsigned long) arg2,
 395                          (unsigned long) arg3,
 396                          (unsigned long) arg4,
 397                          (unsigned long) arg5);
 398 }
 399
 400 /* Note: it is necessary to treat pid as an unsigned int,
 401  * with the corresponding cast to a signed int to insure that the
 402  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 403  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 404  */
 405 asmlinkage long compat_sys_sched_rr_get_interval(u32 pid, struct compat_timespec __user *interval)
 406 {
 407         struct timespec t;
 408         int ret;
 409         mm_segment_t old_fs = get_fs ();
 410
 411         /* The __user pointer cast is valid because of the set_fs() */
 412         set_fs (KERNEL_DS);
 413         ret = sys_sched_rr_get_interval((int)pid, (struct timespec __user *) &t);
 414         set_fs (old_fs);
 415         if (put_compat_timespec(&t, interval))
 416                 return -EFAULT;
 417         return ret;
 418 }
 419
 420 /* Note: it is necessary to treat mode as an unsigned int,
 421  * with the corresponding cast to a signed int to insure that the
 422  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 423  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 424  */
 425 asmlinkage long compat_sys_access(const char __user * filename, u32 mode)
 426 {
 427         return sys_access(filename, (int)mode);
 428 }
 429
 430
 431 /* Note: it is necessary to treat mode as an unsigned int,
 432  * with the corresponding cast to a signed int to insure that the
 433  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 434  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 435  */
 436 asmlinkage long compat_sys_creat(const char __user * pathname, u32 mode)
 437 {
 438         return sys_creat(pathname, (int)mode);
 439 }
 440
 441
 442 /* Note: it is necessary to treat pid and options as unsigned ints,
 443  * with the corresponding cast to a signed int to insure that the
 444  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 445  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 446  */
 447 asmlinkage long compat_sys_waitpid(u32 pid, unsigned int __user * stat_addr, u32 options)
 448 {
 449         return sys_waitpid((int)pid, stat_addr, (int)options);
 450 }
 451
 452
 453 /* Note: it is necessary to treat gidsetsize as an unsigned int,
 454  * with the corresponding cast to a signed int to insure that the
 455  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 456  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 457  */
 458 asmlinkage long compat_sys_getgroups(u32 gidsetsize, gid_t __user *grouplist)
 459 {
 460         return sys_getgroups((int)gidsetsize, grouplist);
 461 }
 462
 463
 464 /* Note: it is necessary to treat pid as an unsigned int,
 465  * with the corresponding cast to a signed int to insure that the
 466  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 467  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 468  */
 469 asmlinkage long compat_sys_getpgid(u32 pid)
 470 {
 471         return sys_getpgid((int)pid);
 472 }
 473
 474
 475
 476 /* Note: it is necessary to treat pid as an unsigned int,
 477  * with the corresponding cast to a signed int to insure that the
 478  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 479  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 480  */
 481 asmlinkage long compat_sys_getsid(u32 pid)
 482 {
 483         return sys_getsid((int)pid);
 484 }
 485
 486
 487 /* Note: it is necessary to treat pid and sig as unsigned ints,
 488  * with the corresponding cast to a signed int to insure that the
 489  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 490  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 491  */
 492 asmlinkage long compat_sys_kill(u32 pid, u32 sig)
 493 {
 494         return sys_kill((int)pid, (int)sig);
 495 }
 496
 497
 498 /* Note: it is necessary to treat mode as an unsigned int,
 499  * with the corresponding cast to a signed int to insure that the
 500  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 501  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 502  */
 503 asmlinkage long compat_sys_mkdir(const char __user * pathname, u32 mode)
 504 {
 505         return sys_mkdir(pathname, (int)mode);
 506 }
 507
 508 long compat_sys_nice(u32 increment)
 509 {
 510         /* sign extend increment */
 511         return sys_nice((int)increment);
 512 }
 513
 514 off_t ppc32_lseek(unsigned int fd, u32 offset, unsigned int origin)
 515 {
 516         /* sign extend n */
 517         return sys_lseek(fd, (int)offset, origin);
 518 }
 519
 520 /* Note: it is necessary to treat bufsiz as an unsigned int,
 521  * with the corresponding cast to a signed int to insure that the
 522  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 523  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 524  */
 525 asmlinkage long compat_sys_readlink(const char __user * path, char __user * buf, u32 bufsiz)
 526 {
 527         return sys_readlink(path, buf, (int)bufsiz);
 528 }
 529
 530 /* Note: it is necessary to treat option as an unsigned int,
 531  * with the corresponding cast to a signed int to insure that the
 532  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 533  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 534  */
 535 asmlinkage long compat_sys_sched_get_priority_max(u32 policy)
 536 {
 537         return sys_sched_get_priority_max((int)policy);
 538 }
 539
 540
 541 /* Note: it is necessary to treat policy as an unsigned int,
 542  * with the corresponding cast to a signed int to insure that the
 543  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 544  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 545  */
 546 asmlinkage long compat_sys_sched_get_priority_min(u32 policy)
 547 {
 548         return sys_sched_get_priority_min((int)policy);
 549 }
 550
 551
 552 /* Note: it is necessary to treat pid as an unsigned int,
 553  * with the corresponding cast to a signed int to insure that the
 554  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 555  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 556  */
 557 asmlinkage long compat_sys_sched_getparam(u32 pid, struct sched_param __user *param)
 558 {
 559         return sys_sched_getparam((int)pid, param);
 560 }
 561
 562
 563 /* Note: it is necessary to treat pid as an unsigned int,
 564  * with the corresponding cast to a signed int to insure that the
 565  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 566  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 567  */
 568 asmlinkage long compat_sys_sched_getscheduler(u32 pid)
 569 {
 570         return sys_sched_getscheduler((int)pid);
 571 }
 572
 573
 574 /* Note: it is necessary to treat pid as an unsigned int,
 575  * with the corresponding cast to a signed int to insure that the
 576  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 577  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 578  */
 579 asmlinkage long compat_sys_sched_setparam(u32 pid, struct sched_param __user *param)
 580 {
 581         return sys_sched_setparam((int)pid, param);
 582 }
 583
 584
 585 /* Note: it is necessary to treat pid and policy as unsigned ints,
 586  * with the corresponding cast to a signed int to insure that the
 587  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 588  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 589  */
 590 asmlinkage long compat_sys_sched_setscheduler(u32 pid, u32 policy, struct sched_param __user *param)
 591 {
 592         return sys_sched_setscheduler((int)pid, (int)policy, param);
 593 }
 594
 595
 596 /* Note: it is necessary to treat len as an unsigned int,
 597  * with the corresponding cast to a signed int to insure that the
 598  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 599  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 600  */
 601 asmlinkage long compat_sys_setdomainname(char __user *name, u32 len)
 602 {
 603         return sys_setdomainname(name, (int)len);
 604 }
 605
 606
 607 /* Note: it is necessary to treat gidsetsize as an unsigned int,
 608  * with the corresponding cast to a signed int to insure that the
 609  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 610  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 611  */
 612 asmlinkage long compat_sys_setgroups(u32 gidsetsize, gid_t __user *grouplist)
 613 {
 614         return sys_setgroups((int)gidsetsize, grouplist);
 615 }
 616
 617
 618 asmlinkage long compat_sys_sethostname(char __user *name, u32 len)
 619 {
 620         /* sign extend len */
 621         return sys_sethostname(name, (int)len);
 622 }
 623
 624
 625 /* Note: it is necessary to treat pid and pgid as unsigned ints,
 626  * with the corresponding cast to a signed int to insure that the
 627  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 628  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 629  */
 630 asmlinkage long compat_sys_setpgid(u32 pid, u32 pgid)
 631 {
 632         return sys_setpgid((int)pid, (int)pgid);
 633 }
 634
 635 long compat_sys_getpriority(u32 which, u32 who)
 636 {
 637         /* sign extend which and who */
 638         return sys_getpriority((int)which, (int)who);
 639 }
 640
 641 long compat_sys_setpriority(u32 which, u32 who, u32 niceval)
 642 {
 643         /* sign extend which, who and niceval */
 644         return sys_setpriority((int)which, (int)who, (int)niceval);
 645 }
 646
 647 long compat_sys_ioprio_get(u32 which, u32 who)
 648 {
 649         /* sign extend which and who */
 650         return sys_ioprio_get((int)which, (int)who);
 651 }
 652
 653 long compat_sys_ioprio_set(u32 which, u32 who, u32 ioprio)
 654 {
 655         /* sign extend which, who and ioprio */
 656         return sys_ioprio_set((int)which, (int)who, (int)ioprio);
 657 }
 658
 659 /* Note: it is necessary to treat newmask as an unsigned int,
 660  * with the corresponding cast to a signed int to insure that the
 661  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 662  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 663  */
 664 asmlinkage long compat_sys_ssetmask(u32 newmask)
 665 {
 666         return sys_ssetmask((int) newmask);
 667 }
 668
 669 asmlinkage long compat_sys_syslog(u32 type, char __user * buf, u32 len)
 670 {
 671         /* sign extend len */
 672         return sys_syslog(type, buf, (int)len);
 673 }
 674
 675
 676 /* Note: it is necessary to treat mask as an unsigned int,
 677  * with the corresponding cast to a signed int to insure that the
 678  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 679  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 680  */
 681 asmlinkage long compat_sys_umask(u32 mask)
 682 {
 683         return sys_umask((int)mask);
 684 }
 685
 686 #ifdef CONFIG_SYSCTL_SYSCALL
 687 struct __sysctl_args32 {
 688         u32 name;
 689         int nlen;
 690         u32 oldval;
 691         u32 oldlenp;
 692         u32 newval;
 693         u32 newlen;
 694         u32 __unused[4];
 695 };
 696
 697 asmlinkage long compat_sys_sysctl(struct __sysctl_args32 __user *args)
 698 {
 699         struct __sysctl_args32 tmp;
 700         int error;
 701         size_t oldlen;
 702         size_t __user *oldlenp = NULL;
 703         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 704
 705         if (copy_from_user(&tmp, args, sizeof(tmp)))
 706                 return -EFAULT;
 707
 708         if (tmp.oldval && tmp.oldlenp) {
 709                 /* Duh, this is ugly and might not work if sysctl_args
 710                    is in read-only memory, but do_sysctl does indirectly
 711                    a lot of uaccess in both directions and we'd have to
 712                    basically copy the whole sysctl.c here, and
 713                    glibc's __sysctl uses rw memory for the structure
 714                    anyway.  */
 715                 oldlenp = (size_t __user *)addr;
 716                 if (get_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)) ||
 717                     put_user(oldlen, oldlenp))
 718                         return -EFAULT;
 719         }
 720
 721         lock_kernel();
 722         error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
 723                           compat_ptr(tmp.oldval), oldlenp,
 724                           compat_ptr(tmp.newval), tmp.newlen);
 725         unlock_kernel();
 726         if (oldlenp) {
 727                 if (!error) {
 728                         if (get_user(oldlen, oldlenp) ||
 729                             put_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)))
 730                                 error = -EFAULT;
 731                 }
 732                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 733         }
 734         return error;
 735 }
 736 #endif
 737
 738 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
 739                           unsigned long prot, unsigned long flags,
 740                           unsigned long fd, unsigned long pgoff)
 741 {
 742         /* This should remain 12 even if PAGE_SIZE changes */
 743         return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
 744 }
 745
 746 long compat_sys_tgkill(u32 tgid, u32 pid, int sig)
 747 {
 748         /* sign extend tgid, pid */
 749         return sys_tgkill((int)tgid, (int)pid, sig);
 750 }
 751
 752 /*
 753  * long long munging:
 754  * The 32 bit ABI passes long longs in an odd even register pair.
 755  */
 756
 757 compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
 758                              u32 reg6, u32 poshi, u32 poslo)
 759 {
 760         return sys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 761 }
 762
 763 compat_ssize_t compat_sys_pwrite64(unsigned int fd, char __user *ubuf, compat_size_t count,
 764                               u32 reg6, u32 poshi, u32 poslo)
 765 {
 766         return sys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 767 }
 768
 769 compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)
 770 {
 771         return sys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);
 772 }
 773
 774 asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
 775                                 unsigned long high, unsigned long low)
 776 {
 777         return sys_truncate(path, (high << 32) | low);
 778 }
 779
 780 asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high,
 781                                  unsigned long low)
 782 {
 783         return sys_ftruncate(fd, (high << 32) | low);
 784 }
 785
 786 long ppc32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 787                           size_t len)
 788 {
 789         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 790                                   buf, len);
 791 }
 792
 793 long ppc32_fadvise64(int fd, u32 unused, u32 offset_high, u32 offset_low,
 794                      size_t len, int advice)
 795 {
 796         return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, len,
 797                              advice);
 798 }
 799
 800 asmlinkage long compat_sys_add_key(const char __user *_type,
 801                               const char __user *_description,
 802                               const void __user *_payload,
 803                               u32 plen,
 804                               u32 ringid)
 805 {
 806         return sys_add_key(_type, _description, _payload, plen, ringid);
 807 }
 808
 809 asmlinkage long compat_sys_request_key(const char __user *_type,
 810                                   const char __user *_description,
 811                                   const char __user *_callout_info,
 812                                   u32 destringid)
 813 {
 814         return sys_request_key(_type, _description, _callout_info, destringid);
 815 }
 816