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 #include <linux/ipc.h>
  45
  46 #include <asm/ptrace.h>
  47 #include <asm/types.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 struct old_linux_dirent32 {
  57         u32             d_ino;
  58         u32             d_offset;
  59         unsigned short  d_namlen;
  60         char            d_name[1];
  61 };
  62
  63 struct readdir_callback32 {
  64         struct old_linux_dirent32 __user * dirent;
  65         int count;
  66 };
  67
  68 static int fillonedir(void * __buf, const char * name, int namlen,
  69                                   off_t offset, u64 ino, unsigned int d_type)
  70 {
  71         struct readdir_callback32 * buf = (struct readdir_callback32 *) __buf;
  72         struct old_linux_dirent32 __user * dirent;
  73         ino_t d_ino;
  74
  75         if (buf->count)
  76                 return -EINVAL;
  77         d_ino = ino;
  78         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
  79                 return -EOVERFLOW;
  80         buf->count++;
  81         dirent = buf->dirent;
  82         put_user(d_ino, &dirent->d_ino);
  83         put_user(offset, &dirent->d_offset);
  84         put_user(namlen, &dirent->d_namlen);
  85         copy_to_user(dirent->d_name, name, namlen);
  86         put_user(0, dirent->d_name + namlen);
  87         return 0;
  88 }
  89
  90 asmlinkage int old32_readdir(unsigned int fd, struct old_linux_dirent32 __user *dirent, unsigned int count)
  91 {
  92         int error = -EBADF;
  93         struct file * file;
  94         struct readdir_callback32 buf;
  95
  96         file = fget(fd);
  97         if (!file)
  98                 goto out;
  99
 100         buf.count = 0;
 101         buf.dirent = dirent;
 102
 103         error = vfs_readdir(file, (filldir_t)fillonedir, &buf);
 104         if (error < 0)
 105                 goto out_putf;
 106         error = buf.count;
 107
 108 out_putf:
 109         fput(file);
 110 out:
 111         return error;
 112 }
 113
 114 asmlinkage long ppc32_select(u32 n, compat_ulong_t __user *inp,
 115                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
 116                 compat_uptr_t tvp_x)
 117 {
 118         /* sign extend n */
 119         return compat_sys_select((int)n, inp, outp, exp, compat_ptr(tvp_x));
 120 }
 121
 122 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
 123 {
 124         compat_ino_t ino;
 125         long err;
 126
 127         if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
 128             !new_valid_dev(stat->rdev))
 129                 return -EOVERFLOW;
 130
 131         ino = stat->ino;
 132         if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
 133                 return -EOVERFLOW;
 134
 135         err  = access_ok(VERIFY_WRITE, statbuf, sizeof(*statbuf)) ? 0 : -EFAULT;
 136         err |= __put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
 137         err |= __put_user(ino, &statbuf->st_ino);
 138         err |= __put_user(stat->mode, &statbuf->st_mode);
 139         err |= __put_user(stat->nlink, &statbuf->st_nlink);
 140         err |= __put_user(stat->uid, &statbuf->st_uid);
 141         err |= __put_user(stat->gid, &statbuf->st_gid);
 142         err |= __put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
 143         err |= __put_user(stat->size, &statbuf->st_size);
 144         err |= __put_user(stat->atime.tv_sec, &statbuf->st_atime);
 145         err |= __put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
 146         err |= __put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
 147         err |= __put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
 148         err |= __put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
 149         err |= __put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
 150         err |= __put_user(stat->blksize, &statbuf->st_blksize);
 151         err |= __put_user(stat->blocks, &statbuf->st_blocks);
 152         err |= __put_user(0, &statbuf->__unused4[0]);
 153         err |= __put_user(0, &statbuf->__unused4[1]);
 154
 155         return err;
 156 }
 157
 158 /* Note: it is necessary to treat option as an unsigned int,
 159  * with the corresponding cast to a signed int to insure that the
 160  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 161  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 162  */
 163 asmlinkage long compat_sys_sysfs(u32 option, u32 arg1, u32 arg2)
 164 {
 165         return sys_sysfs((int)option, arg1, arg2);
 166 }
 167
 168 asmlinkage long compat_sys_pause(void)
 169 {
 170         current->state = TASK_INTERRUPTIBLE;
 171         schedule();
 172
 173         return -ERESTARTNOHAND;
 174 }
 175
 176 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
 177 {
 178         long usec;
 179
 180         if (!access_ok(VERIFY_READ, i, sizeof(*i)))
 181                 return -EFAULT;
 182         if (__get_user(o->tv_sec, &i->tv_sec))
 183                 return -EFAULT;
 184         if (__get_user(usec, &i->tv_usec))
 185                 return -EFAULT;
 186         o->tv_nsec = usec * 1000;
 187         return 0;
 188 }
 189
 190 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
 191 {
 192         return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
 193                 (__put_user(i->tv_sec, &o->tv_sec) |
 194                  __put_user(i->tv_usec, &o->tv_usec)));
 195 }
 196
 197
 198
 199
 200 /* Translations due to time_t size differences.  Which affects all
 201    sorts of things, like timeval and itimerval.  */
 202 extern struct timezone sys_tz;
 203
 204 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 205 {
 206         if (tv) {
 207                 struct timeval ktv;
 208                 do_gettimeofday(&ktv);
 209                 if (put_tv32(tv, &ktv))
 210                         return -EFAULT;
 211         }
 212         if (tz) {
 213                 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
 214                         return -EFAULT;
 215         }
 216
 217         return 0;
 218 }
 219
 220
 221
 222 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
 223 {
 224         struct timespec kts;
 225         struct timezone ktz;
 226
 227         if (tv) {
 228                 if (get_ts32(&kts, tv))
 229                         return -EFAULT;
 230         }
 231         if (tz) {
 232                 if (copy_from_user(&ktz, tz, sizeof(ktz)))
 233                         return -EFAULT;
 234         }
 235
 236         return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
 237 }
 238
 239 #ifdef CONFIG_SYSVIPC
 240 long compat_sys_ipc(u32 call, u32 first, u32 second, u32 third, compat_uptr_t ptr,
 241                u32 fifth)
 242 {
 243         int version;
 244
 245         version = call >> 16; /* hack for backward compatibility */
 246         call &= 0xffff;
 247
 248         switch (call) {
 249
 250         case SEMTIMEDOP:
 251                 if (fifth)
 252                         /* sign extend semid */
 253                         return compat_sys_semtimedop((int)first,
 254                                                      compat_ptr(ptr), second,
 255                                                      compat_ptr(fifth));
 256                 /* else fall through for normal semop() */
 257         case SEMOP:
 258                 /* struct sembuf is the same on 32 and 64bit :)) */
 259                 /* sign extend semid */
 260                 return sys_semtimedop((int)first, compat_ptr(ptr), second,
 261                                       NULL);
 262         case SEMGET:
 263                 /* sign extend key, nsems */
 264                 return sys_semget((int)first, (int)second, third);
 265         case SEMCTL:
 266                 /* sign extend semid, semnum */
 267                 return compat_sys_semctl((int)first, (int)second, third,
 268                                          compat_ptr(ptr));
 269
 270         case MSGSND:
 271                 /* sign extend msqid */
 272                 return compat_sys_msgsnd((int)first, (int)second, third,
 273                                          compat_ptr(ptr));
 274         case MSGRCV:
 275                 /* sign extend msqid, msgtyp */
 276                 return compat_sys_msgrcv((int)first, second, (int)fifth,
 277                                          third, version, compat_ptr(ptr));
 278         case MSGGET:
 279                 /* sign extend key */
 280                 return sys_msgget((int)first, second);
 281         case MSGCTL:
 282                 /* sign extend msqid */
 283                 return compat_sys_msgctl((int)first, second, compat_ptr(ptr));
 284
 285         case SHMAT:
 286                 /* sign extend shmid */
 287                 return compat_sys_shmat((int)first, second, third, version,
 288                                         compat_ptr(ptr));
 289         case SHMDT:
 290                 return sys_shmdt(compat_ptr(ptr));
 291         case SHMGET:
 292                 /* sign extend key_t */
 293                 return sys_shmget((int)first, second, third);
 294         case SHMCTL:
 295                 /* sign extend shmid */
 296                 return compat_sys_shmctl((int)first, second, compat_ptr(ptr));
 297
 298         default:
 299                 return -ENOSYS;
 300         }
 301
 302         return -ENOSYS;
 303 }
 304 #endif
 305
 306 /* Note: it is necessary to treat out_fd and in_fd as unsigned ints,
 307  * with the corresponding cast to a signed int to insure that the
 308  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 309  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 310  */
 311 asmlinkage long compat_sys_sendfile(u32 out_fd, u32 in_fd, compat_off_t __user * offset, u32 count)
 312 {
 313         mm_segment_t old_fs = get_fs();
 314         int ret;
 315         off_t of;
 316         off_t __user *up;
 317
 318         if (offset && get_user(of, offset))
 319                 return -EFAULT;
 320
 321         /* The __user pointer cast is valid because of the set_fs() */
 322         set_fs(KERNEL_DS);
 323         up = offset ? (off_t __user *) &of : NULL;
 324         ret = sys_sendfile((int)out_fd, (int)in_fd, up, count);
 325         set_fs(old_fs);
 326
 327         if (offset && put_user(of, offset))
 328                 return -EFAULT;
 329
 330         return ret;
 331 }
 332
 333 asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 334 {
 335         mm_segment_t old_fs = get_fs();
 336         int ret;
 337         loff_t lof;
 338         loff_t __user *up;
 339
 340         if (offset && get_user(lof, offset))
 341                 return -EFAULT;
 342
 343         /* The __user pointer cast is valid because of the set_fs() */
 344         set_fs(KERNEL_DS);
 345         up = offset ? (loff_t __user *) &lof : NULL;
 346         ret = sys_sendfile64(out_fd, in_fd, up, count);
 347         set_fs(old_fs);
 348
 349         if (offset && put_user(lof, offset))
 350                 return -EFAULT;
 351
 352         return ret;
 353 }
 354
 355 long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 356                   unsigned long a3, unsigned long a4, unsigned long a5,
 357                   struct pt_regs *regs)
 358 {
 359         int error;
 360         char * filename;
 361
 362         filename = getname((char __user *) a0);
 363         error = PTR_ERR(filename);
 364         if (IS_ERR(filename))
 365                 goto out;
 366         flush_fp_to_thread(current);
 367         flush_altivec_to_thread(current);
 368
 369         error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
 370
 371         if (error == 0) {
 372                 task_lock(current);
 373                 current->ptrace &= ~PT_DTRACE;
 374                 task_unlock(current);
 375         }
 376         putname(filename);
 377
 378 out:
 379         return error;
 380 }
 381
 382 /* Note: it is necessary to treat option as an unsigned int,
 383  * with the corresponding cast to a signed int to insure that the
 384  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 385  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 386  */
 387 asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3, u32 arg4, u32 arg5)
 388 {
 389         return sys_prctl((int)option,
 390                          (unsigned long) arg2,
 391                          (unsigned long) arg3,
 392                          (unsigned long) arg4,
 393                          (unsigned long) arg5);
 394 }
 395
 396 /* Note: it is necessary to treat pid as an unsigned int,
 397  * with the corresponding cast to a signed int to insure that the
 398  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 399  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 400  */
 401 asmlinkage long compat_sys_sched_rr_get_interval(u32 pid, struct compat_timespec __user *interval)
 402 {
 403         struct timespec t;
 404         int ret;
 405         mm_segment_t old_fs = get_fs ();
 406
 407         /* The __user pointer cast is valid because of the set_fs() */
 408         set_fs (KERNEL_DS);
 409         ret = sys_sched_rr_get_interval((int)pid, (struct timespec __user *) &t);
 410         set_fs (old_fs);
 411         if (put_compat_timespec(&t, interval))
 412                 return -EFAULT;
 413         return ret;
 414 }
 415
 416 /* Note: it is necessary to treat mode as an unsigned int,
 417  * with the corresponding cast to a signed int to insure that the
 418  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 419  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 420  */
 421 asmlinkage long compat_sys_access(const char __user * filename, u32 mode)
 422 {
 423         return sys_access(filename, (int)mode);
 424 }
 425
 426
 427 /* Note: it is necessary to treat mode as an unsigned int,
 428  * with the corresponding cast to a signed int to insure that the
 429  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 430  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 431  */
 432 asmlinkage long compat_sys_creat(const char __user * pathname, u32 mode)
 433 {
 434         return sys_creat(pathname, (int)mode);
 435 }
 436
 437
 438 /* Note: it is necessary to treat pid and options as unsigned ints,
 439  * with the corresponding cast to a signed int to insure that the
 440  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 441  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 442  */
 443 asmlinkage long compat_sys_waitpid(u32 pid, unsigned int __user * stat_addr, u32 options)
 444 {
 445         return sys_waitpid((int)pid, stat_addr, (int)options);
 446 }
 447
 448
 449 /* Note: it is necessary to treat gidsetsize as an unsigned int,
 450  * with the corresponding cast to a signed int to insure that the
 451  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 452  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 453  */
 454 asmlinkage long compat_sys_getgroups(u32 gidsetsize, gid_t __user *grouplist)
 455 {
 456         return sys_getgroups((int)gidsetsize, grouplist);
 457 }
 458
 459
 460 /* Note: it is necessary to treat pid as an unsigned int,
 461  * with the corresponding cast to a signed int to insure that the
 462  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 463  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 464  */
 465 asmlinkage long compat_sys_getpgid(u32 pid)
 466 {
 467         return sys_getpgid((int)pid);
 468 }
 469
 470
 471
 472 /* Note: it is necessary to treat pid as an unsigned int,
 473  * with the corresponding cast to a signed int to insure that the
 474  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 475  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 476  */
 477 asmlinkage long compat_sys_getsid(u32 pid)
 478 {
 479         return sys_getsid((int)pid);
 480 }
 481
 482
 483 /* Note: it is necessary to treat pid and sig as unsigned ints,
 484  * with the corresponding cast to a signed int to insure that the
 485  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 486  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 487  */
 488 asmlinkage long compat_sys_kill(u32 pid, u32 sig)
 489 {
 490         return sys_kill((int)pid, (int)sig);
 491 }
 492
 493
 494 /* Note: it is necessary to treat mode as an unsigned int,
 495  * with the corresponding cast to a signed int to insure that the
 496  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 497  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 498  */
 499 asmlinkage long compat_sys_mkdir(const char __user * pathname, u32 mode)
 500 {
 501         return sys_mkdir(pathname, (int)mode);
 502 }
 503
 504 long compat_sys_nice(u32 increment)
 505 {
 506         /* sign extend increment */
 507         return sys_nice((int)increment);
 508 }
 509
 510 off_t ppc32_lseek(unsigned int fd, u32 offset, unsigned int origin)
 511 {
 512         /* sign extend n */
 513         return sys_lseek(fd, (int)offset, origin);
 514 }
 515
 516 /* Note: it is necessary to treat bufsiz as an unsigned int,
 517  * with the corresponding cast to a signed int to insure that the
 518  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 519  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 520  */
 521 asmlinkage long compat_sys_readlink(const char __user * path, char __user * buf, u32 bufsiz)
 522 {
 523         return sys_readlink(path, buf, (int)bufsiz);
 524 }
 525
 526 /* Note: it is necessary to treat option as an unsigned int,
 527  * with the corresponding cast to a signed int to insure that the
 528  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 529  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 530  */
 531 asmlinkage long compat_sys_sched_get_priority_max(u32 policy)
 532 {
 533         return sys_sched_get_priority_max((int)policy);
 534 }
 535
 536
 537 /* Note: it is necessary to treat policy as an unsigned int,
 538  * with the corresponding cast to a signed int to insure that the
 539  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 540  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 541  */
 542 asmlinkage long compat_sys_sched_get_priority_min(u32 policy)
 543 {
 544         return sys_sched_get_priority_min((int)policy);
 545 }
 546
 547
 548 /* Note: it is necessary to treat pid as an unsigned int,
 549  * with the corresponding cast to a signed int to insure that the
 550  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 551  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 552  */
 553 asmlinkage long compat_sys_sched_getparam(u32 pid, struct sched_param __user *param)
 554 {
 555         return sys_sched_getparam((int)pid, param);
 556 }
 557
 558
 559 /* Note: it is necessary to treat pid as an unsigned int,
 560  * with the corresponding cast to a signed int to insure that the
 561  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 562  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 563  */
 564 asmlinkage long compat_sys_sched_getscheduler(u32 pid)
 565 {
 566         return sys_sched_getscheduler((int)pid);
 567 }
 568
 569
 570 /* Note: it is necessary to treat pid as an unsigned int,
 571  * with the corresponding cast to a signed int to insure that the
 572  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 573  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 574  */
 575 asmlinkage long compat_sys_sched_setparam(u32 pid, struct sched_param __user *param)
 576 {
 577         return sys_sched_setparam((int)pid, param);
 578 }
 579
 580
 581 /* Note: it is necessary to treat pid and policy as unsigned ints,
 582  * with the corresponding cast to a signed int to insure that the
 583  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 584  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 585  */
 586 asmlinkage long compat_sys_sched_setscheduler(u32 pid, u32 policy, struct sched_param __user *param)
 587 {
 588         return sys_sched_setscheduler((int)pid, (int)policy, param);
 589 }
 590
 591
 592 /* Note: it is necessary to treat len as an unsigned int,
 593  * with the corresponding cast to a signed int to insure that the
 594  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 595  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 596  */
 597 asmlinkage long compat_sys_setdomainname(char __user *name, u32 len)
 598 {
 599         return sys_setdomainname(name, (int)len);
 600 }
 601
 602
 603 /* Note: it is necessary to treat gidsetsize as an unsigned int,
 604  * with the corresponding cast to a signed int to insure that the
 605  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 606  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 607  */
 608 asmlinkage long compat_sys_setgroups(u32 gidsetsize, gid_t __user *grouplist)
 609 {
 610         return sys_setgroups((int)gidsetsize, grouplist);
 611 }
 612
 613
 614 asmlinkage long compat_sys_sethostname(char __user *name, u32 len)
 615 {
 616         /* sign extend len */
 617         return sys_sethostname(name, (int)len);
 618 }
 619
 620
 621 /* Note: it is necessary to treat pid and pgid as unsigned ints,
 622  * with the corresponding cast to a signed int to insure that the
 623  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 624  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 625  */
 626 asmlinkage long compat_sys_setpgid(u32 pid, u32 pgid)
 627 {
 628         return sys_setpgid((int)pid, (int)pgid);
 629 }
 630
 631 long compat_sys_getpriority(u32 which, u32 who)
 632 {
 633         /* sign extend which and who */
 634         return sys_getpriority((int)which, (int)who);
 635 }
 636
 637 long compat_sys_setpriority(u32 which, u32 who, u32 niceval)
 638 {
 639         /* sign extend which, who and niceval */
 640         return sys_setpriority((int)which, (int)who, (int)niceval);
 641 }
 642
 643 long compat_sys_ioprio_get(u32 which, u32 who)
 644 {
 645         /* sign extend which and who */
 646         return sys_ioprio_get((int)which, (int)who);
 647 }
 648
 649 long compat_sys_ioprio_set(u32 which, u32 who, u32 ioprio)
 650 {
 651         /* sign extend which, who and ioprio */
 652         return sys_ioprio_set((int)which, (int)who, (int)ioprio);
 653 }
 654
 655 /* Note: it is necessary to treat newmask as an unsigned int,
 656  * with the corresponding cast to a signed int to insure that the
 657  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 658  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 659  */
 660 asmlinkage long compat_sys_ssetmask(u32 newmask)
 661 {
 662         return sys_ssetmask((int) newmask);
 663 }
 664
 665 asmlinkage long compat_sys_syslog(u32 type, char __user * buf, u32 len)
 666 {
 667         /* sign extend len */
 668         return sys_syslog(type, buf, (int)len);
 669 }
 670
 671
 672 /* Note: it is necessary to treat mask as an unsigned int,
 673  * with the corresponding cast to a signed int to insure that the
 674  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 675  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 676  */
 677 asmlinkage long compat_sys_umask(u32 mask)
 678 {
 679         return sys_umask((int)mask);
 680 }
 681
 682 #ifdef CONFIG_SYSCTL_SYSCALL
 683 struct __sysctl_args32 {
 684         u32 name;
 685         int nlen;
 686         u32 oldval;
 687         u32 oldlenp;
 688         u32 newval;
 689         u32 newlen;
 690         u32 __unused[4];
 691 };
 692
 693 asmlinkage long compat_sys_sysctl(struct __sysctl_args32 __user *args)
 694 {
 695         struct __sysctl_args32 tmp;
 696         int error;
 697         size_t oldlen;
 698         size_t __user *oldlenp = NULL;
 699         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 700
 701         if (copy_from_user(&tmp, args, sizeof(tmp)))
 702                 return -EFAULT;
 703
 704         if (tmp.oldval && tmp.oldlenp) {
 705                 /* Duh, this is ugly and might not work if sysctl_args
 706                    is in read-only memory, but do_sysctl does indirectly
 707                    a lot of uaccess in both directions and we'd have to
 708                    basically copy the whole sysctl.c here, and
 709                    glibc's __sysctl uses rw memory for the structure
 710                    anyway.  */
 711                 oldlenp = (size_t __user *)addr;
 712                 if (get_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)) ||
 713                     put_user(oldlen, oldlenp))
 714                         return -EFAULT;
 715         }
 716
 717         lock_kernel();
 718         error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
 719                           compat_ptr(tmp.oldval), oldlenp,
 720                           compat_ptr(tmp.newval), tmp.newlen);
 721         unlock_kernel();
 722         if (oldlenp) {
 723                 if (!error) {
 724                         if (get_user(oldlen, oldlenp) ||
 725                             put_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)))
 726                                 error = -EFAULT;
 727                 }
 728                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 729         }
 730         return error;
 731 }
 732 #endif
 733
 734 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
 735                           unsigned long prot, unsigned long flags,
 736                           unsigned long fd, unsigned long pgoff)
 737 {
 738         /* This should remain 12 even if PAGE_SIZE changes */
 739         return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
 740 }
 741
 742 long compat_sys_tgkill(u32 tgid, u32 pid, int sig)
 743 {
 744         /* sign extend tgid, pid */
 745         return sys_tgkill((int)tgid, (int)pid, sig);
 746 }
 747
 748 /*
 749  * long long munging:
 750  * The 32 bit ABI passes long longs in an odd even register pair.
 751  */
 752
 753 compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
 754                              u32 reg6, u32 poshi, u32 poslo)
 755 {
 756         return sys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 757 }
 758
 759 compat_ssize_t compat_sys_pwrite64(unsigned int fd, char __user *ubuf, compat_size_t count,
 760                               u32 reg6, u32 poshi, u32 poslo)
 761 {
 762         return sys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 763 }
 764
 765 compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)
 766 {
 767         return sys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);
 768 }
 769
 770 asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
 771                                 unsigned long high, unsigned long low)
 772 {
 773         return sys_truncate(path, (high << 32) | low);
 774 }
 775
 776 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 777                                      u32 lenhi, u32 lenlo)
 778 {
 779         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 780                              ((loff_t)lenhi << 32) | lenlo);
 781 }
 782
 783 asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high,
 784                                  unsigned long low)
 785 {
 786         return sys_ftruncate(fd, (high << 32) | low);
 787 }
 788
 789 long ppc32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 790                           size_t len)
 791 {
 792         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 793                                   buf, len);
 794 }
 795
 796 long ppc32_fadvise64(int fd, u32 unused, u32 offset_high, u32 offset_low,
 797                      size_t len, int advice)
 798 {
 799         return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, len,
 800                              advice);
 801 }
 802
 803 asmlinkage long compat_sys_add_key(const char __user *_type,
 804                               const char __user *_description,
 805                               const void __user *_payload,
 806                               u32 plen,
 807                               u32 ringid)
 808 {
 809         return sys_add_key(_type, _description, _payload, plen, ringid);
 810 }
 811
 812 asmlinkage long compat_sys_request_key(const char __user *_type,
 813                                   const char __user *_description,
 814                                   const char __user *_callout_info,
 815                                   u32 destringid)
 816 {
 817         return sys_request_key(_type, _description, _callout_info, destringid);
 818 }
 819
 820 asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
 821                                    unsigned offset_hi, unsigned offset_lo,
 822                                    unsigned nbytes_hi, unsigned nbytes_lo)
 823 {
 824         loff_t offset = ((loff_t)offset_hi << 32) | offset_lo;
 825         loff_t nbytes = ((loff_t)nbytes_hi << 32) | nbytes_lo;
 826
 827         return sys_sync_file_range(fd, offset, nbytes, flags);
 828 }