arch/sparc64/kernel/sys_sparc.c

   1 /* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $
   2  * linux/arch/sparc64/kernel/sys_sparc.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/sparc
   6  * platform.
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/sched.h>
  13 #include <linux/fs.h>
  14 #include <linux/file.h>
  15 #include <linux/mm.h>
  16 #include <linux/sem.h>
  17 #include <linux/msg.h>
  18 #include <linux/shm.h>
  19 #include <linux/stat.h>
  20 #include <linux/mman.h>
  21 #include <linux/utsname.h>
  22 #include <linux/smp.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/slab.h>
  25 #include <linux/syscalls.h>
  26 #include <linux/ipc.h>
  27 #include <linux/personality.h>
  28 #include <linux/vs_cvirt.h>
  29
  30 #include <asm/uaccess.h>
  31 #include <asm/ipc.h>
  32 #include <asm/utrap.h>
  33 #include <asm/perfctr.h>
  34
  35 /* #define DEBUG_UNIMP_SYSCALL */
  36
  37 /* XXX Make this per-binary type, this way we can detect the type of
  38  * XXX a binary.  Every Sparc executable calls this very early on.
  39  */
  40 asmlinkage unsigned long sys_getpagesize(void)
  41 {
  42         return PAGE_SIZE;
  43 }
  44
  45 #define COLOUR_ALIGN(addr,pgoff)                \
  46         ((((addr)+SHMLBA-1)&~(SHMLBA-1)) +      \
  47          (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))
  48
  49 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  50 {
  51         struct mm_struct *mm = current->mm;
  52         struct vm_area_struct * vma;
  53         unsigned long task_size = TASK_SIZE;
  54         unsigned long start_addr;
  55         int do_color_align;
  56
  57         if (flags & MAP_FIXED) {
  58                 /* We do not accept a shared mapping if it would violate
  59                  * cache aliasing constraints.
  60                  */
  61                 if ((flags & MAP_SHARED) &&
  62                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
  63                         return -EINVAL;
  64                 return addr;
  65         }
  66
  67         if (test_thread_flag(TIF_32BIT))
  68                 task_size = 0xf0000000UL;
  69         if (len > task_size || len > -PAGE_OFFSET)
  70                 return -ENOMEM;
  71
  72         do_color_align = 0;
  73         if (filp || (flags & MAP_SHARED))
  74                 do_color_align = 1;
  75
  76         if (addr) {
  77                 if (do_color_align)
  78                         addr = COLOUR_ALIGN(addr, pgoff);
  79                 else
  80                         addr = PAGE_ALIGN(addr);
  81
  82                 vma = find_vma(mm, addr);
  83                 if (task_size - len >= addr &&
  84                     (!vma || addr + len <= vma->vm_start))
  85                         return addr;
  86         }
  87
  88         start_addr = addr = mm->free_area_cache;
  89
  90         task_size -= len;
  91
  92 full_search:
  93         if (do_color_align)
  94                 addr = COLOUR_ALIGN(addr, pgoff);
  95         else
  96                 addr = PAGE_ALIGN(addr);
  97
  98         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
  99                 /* At this point:  (!vma || addr < vma->vm_end). */
 100                 if (addr < PAGE_OFFSET && -PAGE_OFFSET - len < addr) {
 101                         addr = PAGE_OFFSET;
 102                         vma = find_vma(mm, PAGE_OFFSET);
 103                 }
 104                 if (task_size < addr) {
 105                         if (start_addr != TASK_UNMAPPED_BASE) {
 106                                 start_addr = addr = TASK_UNMAPPED_BASE;
 107                                 goto full_search;
 108                         }
 109                         return -ENOMEM;
 110                 }
 111                 if (!vma || addr + len <= vma->vm_start) {
 112                         /*
 113                          * Remember the place where we stopped the search:
 114                          */
 115                         mm->free_area_cache = addr + len;
 116                         return addr;
 117                 }
 118                 addr = vma->vm_end;
 119                 if (do_color_align)
 120                         addr = COLOUR_ALIGN(addr, pgoff);
 121         }
 122 }
 123
 124 /* Try to align mapping such that we align it as much as possible. */
 125 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 126 {
 127         unsigned long align_goal, addr = -ENOMEM;
 128
 129         if (flags & MAP_FIXED) {
 130                 /* Ok, don't mess with it. */
 131                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
 132         }
 133         flags &= ~MAP_SHARED;
 134
 135         align_goal = PAGE_SIZE;
 136         if (len >= (4UL * 1024 * 1024))
 137                 align_goal = (4UL * 1024 * 1024);
 138         else if (len >= (512UL * 1024))
 139                 align_goal = (512UL * 1024);
 140         else if (len >= (64UL * 1024))
 141                 align_goal = (64UL * 1024);
 142
 143         do {
 144                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 145                 if (!(addr & ~PAGE_MASK)) {
 146                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 147                         break;
 148                 }
 149
 150                 if (align_goal == (4UL * 1024 * 1024))
 151                         align_goal = (512UL * 1024);
 152                 else if (align_goal == (512UL * 1024))
 153                         align_goal = (64UL * 1024);
 154                 else
 155                         align_goal = PAGE_SIZE;
 156         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 157
 158         /* Mapping is smaller than 64K or larger areas could not
 159          * be obtained.
 160          */
 161         if (addr & ~PAGE_MASK)
 162                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 163
 164         return addr;
 165 }
 166
 167 asmlinkage unsigned long sparc_brk(unsigned long brk)
 168 {
 169         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 170         if (test_thread_flag(TIF_32BIT) &&
 171             brk >= 0xf0000000UL)
 172                 return current->mm->brk;
 173
 174         if ((current->mm->brk & PAGE_OFFSET) != (brk & PAGE_OFFSET))
 175                 return current->mm->brk;
 176         return sys_brk(brk);
 177 }
 178
 179 /*
 180  * sys_pipe() is the normal C calling standard for creating
 181  * a pipe. It's not the way unix traditionally does this, though.
 182  */
 183 asmlinkage long sparc_pipe(struct pt_regs *regs)
 184 {
 185         int fd[2];
 186         int error;
 187
 188         error = do_pipe(fd);
 189         if (error)
 190                 goto out;
 191         regs->u_regs[UREG_I1] = fd[1];
 192         error = fd[0];
 193 out:
 194         return error;
 195 }
 196
 197 /*
 198  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 199  *
 200  * This is really horribly ugly.
 201  */
 202
 203 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 204                         unsigned long third, void __user *ptr, long fifth)
 205 {
 206         int err;
 207
 208         /* No need for backward compatibility. We can start fresh... */
 209         if (call <= SEMCTL) {
 210                 switch (call) {
 211                 case SEMOP:
 212                         err = sys_semtimedop(first, ptr,
 213                                              (unsigned)second, NULL);
 214                         goto out;
 215                 case SEMTIMEDOP:
 216                         err = sys_semtimedop(first, ptr, (unsigned)second,
 217                                 (const struct timespec __user *) fifth);
 218                         goto out;
 219                 case SEMGET:
 220                         err = sys_semget(first, (int)second, (int)third);
 221                         goto out;
 222                 case SEMCTL: {
 223                         union semun fourth;
 224                         err = -EINVAL;
 225                         if (!ptr)
 226                                 goto out;
 227                         err = -EFAULT;
 228                         if (get_user(fourth.__pad,
 229                                      (void __user * __user *) ptr))
 230                                 goto out;
 231                         err = sys_semctl(first, (int)second | IPC_64,
 232                                          (int)third, fourth);
 233                         goto out;
 234                 }
 235                 default:
 236                         err = -ENOSYS;
 237                         goto out;
 238                 };
 239         }
 240         if (call <= MSGCTL) {
 241                 switch (call) {
 242                 case MSGSND:
 243                         err = sys_msgsnd(first, ptr, (size_t)second,
 244                                          (int)third);
 245                         goto out;
 246                 case MSGRCV:
 247                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 248                                          (int)third);
 249                         goto out;
 250                 case MSGGET:
 251                         err = sys_msgget((key_t)first, (int)second);
 252                         goto out;
 253                 case MSGCTL:
 254                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 255                         goto out;
 256                 default:
 257                         err = -ENOSYS;
 258                         goto out;
 259                 };
 260         }
 261         if (call <= SHMCTL) {
 262                 switch (call) {
 263                 case SHMAT: {
 264                         ulong raddr;
 265                         err = do_shmat(first, ptr, (int)second, &raddr);
 266                         if (!err) {
 267                                 if (put_user(raddr,
 268                                              (ulong __user *) third))
 269                                         err = -EFAULT;
 270                         }
 271                         goto out;
 272                 }
 273                 case SHMDT:
 274                         err = sys_shmdt(ptr);
 275                         goto out;
 276                 case SHMGET:
 277                         err = sys_shmget(first, (size_t)second, (int)third);
 278                         goto out;
 279                 case SHMCTL:
 280                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 281                         goto out;
 282                 default:
 283                         err = -ENOSYS;
 284                         goto out;
 285                 };
 286         } else {
 287                 err = -ENOSYS;
 288         }
 289 out:
 290         return err;
 291 }
 292
 293 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 294 {
 295         int ret = sys_newuname(name);
 296
 297         if (current->personality == PER_LINUX32 && !ret) {
 298                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 299                        ? -EFAULT : 0);
 300         }
 301         return ret;
 302 }
 303
 304 asmlinkage long sparc64_personality(unsigned long personality)
 305 {
 306         int ret;
 307
 308         if (current->personality == PER_LINUX32 &&
 309             personality == PER_LINUX)
 310                 personality = PER_LINUX32;
 311         ret = sys_personality(personality);
 312         if (ret == PER_LINUX32)
 313                 ret = PER_LINUX;
 314
 315         return ret;
 316 }
 317
 318 /* Linux version of mmap */
 319 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 320         unsigned long prot, unsigned long flags, unsigned long fd,
 321         unsigned long off)
 322 {
 323         struct file * file = NULL;
 324         unsigned long retval = -EBADF;
 325
 326         if (!(flags & MAP_ANONYMOUS)) {
 327                 file = fget(fd);
 328                 if (!file)
 329                         goto out;
 330         }
 331         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 332         len = PAGE_ALIGN(len);
 333         retval = -EINVAL;
 334
 335         if (test_thread_flag(TIF_32BIT)) {
 336                 if (len > 0xf0000000UL ||
 337                     ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
 338                         goto out_putf;
 339         } else {
 340                 if (len > -PAGE_OFFSET ||
 341                     ((flags & MAP_FIXED) &&
 342                      addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
 343                         goto out_putf;
 344         }
 345
 346         down_write(&current->mm->mmap_sem);
 347         retval = do_mmap(file, addr, len, prot, flags, off);
 348         up_write(&current->mm->mmap_sem);
 349
 350 out_putf:
 351         if (file)
 352                 fput(file);
 353 out:
 354         return retval;
 355 }
 356
 357 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 358 {
 359         long ret;
 360
 361         if (len > -PAGE_OFFSET ||
 362             (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
 363                 return -EINVAL;
 364         down_write(&current->mm->mmap_sem);
 365         ret = do_munmap(current->mm, addr, len);
 366         up_write(&current->mm->mmap_sem);
 367         return ret;
 368 }
 369
 370 extern unsigned long do_mremap(unsigned long addr,
 371         unsigned long old_len, unsigned long new_len,
 372         unsigned long flags, unsigned long new_addr);
 373
 374 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 375         unsigned long old_len, unsigned long new_len,
 376         unsigned long flags, unsigned long new_addr)
 377 {
 378         struct vm_area_struct *vma;
 379         unsigned long ret = -EINVAL;
 380         if (test_thread_flag(TIF_32BIT))
 381                 goto out;
 382         if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
 383                 goto out;
 384         if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
 385                 goto out;
 386         down_write(&current->mm->mmap_sem);
 387         if (flags & MREMAP_FIXED) {
 388                 if (new_addr < PAGE_OFFSET &&
 389                     new_addr + new_len > -PAGE_OFFSET)
 390                         goto out_sem;
 391         } else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
 392                 unsigned long map_flags = 0;
 393                 struct file *file = NULL;
 394
 395                 ret = -ENOMEM;
 396                 if (!(flags & MREMAP_MAYMOVE))
 397                         goto out_sem;
 398
 399                 vma = find_vma(current->mm, addr);
 400                 if (vma) {
 401                         if (vma->vm_flags & VM_SHARED)
 402                                 map_flags |= MAP_SHARED;
 403                         file = vma->vm_file;
 404                 }
 405
 406                 /* MREMAP_FIXED checked above. */
 407                 new_addr = get_unmapped_area(file, addr, new_len,
 408                                     vma ? vma->vm_pgoff : 0,
 409                                     map_flags);
 410                 ret = new_addr;
 411                 if (new_addr & ~PAGE_MASK)
 412                         goto out_sem;
 413                 flags |= MREMAP_FIXED;
 414         }
 415         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 416 out_sem:
 417         up_write(&current->mm->mmap_sem);
 418 out:
 419         return ret;
 420 }
 421
 422 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 423 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 424 {
 425         static int count;
 426
 427         /* Don't make the system unusable, if someone goes stuck */
 428         if (count++ > 5)
 429                 return -ENOSYS;
 430
 431         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 432 #ifdef DEBUG_UNIMP_SYSCALL
 433         show_regs (regs);
 434 #endif
 435
 436         return -ENOSYS;
 437 }
 438
 439 /* #define DEBUG_SPARC_BREAKPOINT */
 440
 441 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 442 {
 443         siginfo_t info;
 444
 445         if (test_thread_flag(TIF_32BIT)) {
 446                 regs->tpc &= 0xffffffff;
 447                 regs->tnpc &= 0xffffffff;
 448         }
 449 #ifdef DEBUG_SPARC_BREAKPOINT
 450         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 451 #endif
 452         info.si_signo = SIGTRAP;
 453         info.si_errno = 0;
 454         info.si_code = TRAP_BRKPT;
 455         info.si_addr = (void __user *)regs->tpc;
 456         info.si_trapno = 0;
 457         force_sig_info(SIGTRAP, &info, current);
 458 #ifdef DEBUG_SPARC_BREAKPOINT
 459         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 460 #endif
 461 }
 462
 463 extern void check_pending(int signum);
 464
 465 asmlinkage long sys_getdomainname(char __user *name, int len)
 466 {
 467         int nlen;
 468         int err = -EFAULT;
 469
 470         down_read(&uts_sem);
 471
 472         nlen = strlen(vx_new_uts(domainname)) + 1;
 473
 474         if (nlen < len)
 475                 len = nlen;
 476         if (len > __NEW_UTS_LEN)
 477                 goto done;
 478         if (copy_to_user(name, vx_new_uts(domainname), len))
 479                 goto done;
 480         err = 0;
 481 done:
 482         up_read(&uts_sem);
 483         return err;
 484 }
 485
 486 asmlinkage long solaris_syscall(struct pt_regs *regs)
 487 {
 488         static int count;
 489
 490         regs->tpc = regs->tnpc;
 491         regs->tnpc += 4;
 492         if (test_thread_flag(TIF_32BIT)) {
 493                 regs->tpc &= 0xffffffff;
 494                 regs->tnpc &= 0xffffffff;
 495         }
 496         if (++count <= 5) {
 497                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 498                 show_regs (regs);
 499         }
 500         send_sig(SIGSEGV, current, 1);
 501
 502         return -ENOSYS;
 503 }
 504
 505 #ifndef CONFIG_SUNOS_EMUL
 506 asmlinkage long sunos_syscall(struct pt_regs *regs)
 507 {
 508         static int count;
 509
 510         regs->tpc = regs->tnpc;
 511         regs->tnpc += 4;
 512         if (test_thread_flag(TIF_32BIT)) {
 513                 regs->tpc &= 0xffffffff;
 514                 regs->tnpc &= 0xffffffff;
 515         }
 516         if (++count <= 20)
 517                 printk ("SunOS binary emulation not compiled in\n");
 518         force_sig(SIGSEGV, current);
 519
 520         return -ENOSYS;
 521 }
 522 #endif
 523
 524 asmlinkage long sys_utrap_install(utrap_entry_t type,
 525                                   utrap_handler_t new_p,
 526                                   utrap_handler_t new_d,
 527                                   utrap_handler_t __user *old_p,
 528                                   utrap_handler_t __user *old_d)
 529 {
 530         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 531                 return -EINVAL;
 532         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 533                 if (old_p) {
 534                         if (!current_thread_info()->utraps) {
 535                                 if (put_user(NULL, old_p))
 536                                         return -EFAULT;
 537                         } else {
 538                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 539                                         return -EFAULT;
 540                         }
 541                 }
 542                 if (old_d) {
 543                         if (put_user(NULL, old_d))
 544                                 return -EFAULT;
 545                 }
 546                 return 0;
 547         }
 548         if (!current_thread_info()->utraps) {
 549                 current_thread_info()->utraps =
 550                         kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 551                 if (!current_thread_info()->utraps)
 552                         return -ENOMEM;
 553                 current_thread_info()->utraps[0] = 1;
 554                 memset(current_thread_info()->utraps+1, 0,
 555                        UT_TRAP_INSTRUCTION_31*sizeof(long));
 556         } else {
 557                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 558                     current_thread_info()->utraps[0] > 1) {
 559                         long *p = current_thread_info()->utraps;
 560
 561                         current_thread_info()->utraps =
 562                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 563                                         GFP_KERNEL);
 564                         if (!current_thread_info()->utraps) {
 565                                 current_thread_info()->utraps = p;
 566                                 return -ENOMEM;
 567                         }
 568                         p[0]--;
 569                         current_thread_info()->utraps[0] = 1;
 570                         memcpy(current_thread_info()->utraps+1, p+1,
 571                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 572                 }
 573         }
 574         if (old_p) {
 575                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 576                         return -EFAULT;
 577         }
 578         if (old_d) {
 579                 if (put_user(NULL, old_d))
 580                         return -EFAULT;
 581         }
 582         current_thread_info()->utraps[type] = (long)new_p;
 583
 584         return 0;
 585 }
 586
 587 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 588 {
 589         if (model >= 3)
 590                 return -EINVAL;
 591         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 592         return 0;
 593 }
 594
 595 asmlinkage long sys_rt_sigaction(int sig,
 596                                  const struct sigaction __user *act,
 597                                  struct sigaction __user *oact,
 598                                  void __user *restorer,
 599                                  size_t sigsetsize)
 600 {
 601         struct k_sigaction new_ka, old_ka;
 602         int ret;
 603
 604         /* XXX: Don't preclude handling different sized sigset_t's.  */
 605         if (sigsetsize != sizeof(sigset_t))
 606                 return -EINVAL;
 607
 608         if (act) {
 609                 new_ka.ka_restorer = restorer;
 610                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 611                         return -EFAULT;
 612         }
 613
 614         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 615
 616         if (!ret && oact) {
 617                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 618                         return -EFAULT;
 619         }
 620
 621         return ret;
 622 }
 623
 624 /* Invoked by rtrap code to update performance counters in
 625  * user space.
 626  */
 627 asmlinkage void update_perfctrs(void)
 628 {
 629         unsigned long pic, tmp;
 630
 631         read_pic(pic);
 632         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 633         __put_user(tmp, current_thread_info()->user_cntd0);
 634         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 635         __put_user(tmp, current_thread_info()->user_cntd1);
 636         reset_pic();
 637 }
 638
 639 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 640 {
 641         int err = 0;
 642
 643         switch(opcode) {
 644         case PERFCTR_ON:
 645                 current_thread_info()->pcr_reg = arg2;
 646                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 647                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 648                 current_thread_info()->kernel_cntd0 =
 649                         current_thread_info()->kernel_cntd1 = 0;
 650                 write_pcr(arg2);
 651                 reset_pic();
 652                 set_thread_flag(TIF_PERFCTR);
 653                 break;
 654
 655         case PERFCTR_OFF:
 656                 err = -EINVAL;
 657                 if (test_thread_flag(TIF_PERFCTR)) {
 658                         current_thread_info()->user_cntd0 =
 659                                 current_thread_info()->user_cntd1 = NULL;
 660                         current_thread_info()->pcr_reg = 0;
 661                         write_pcr(0);
 662                         clear_thread_flag(TIF_PERFCTR);
 663                         err = 0;
 664                 }
 665                 break;
 666
 667         case PERFCTR_READ: {
 668                 unsigned long pic, tmp;
 669
 670                 if (!test_thread_flag(TIF_PERFCTR)) {
 671                         err = -EINVAL;
 672                         break;
 673                 }
 674                 read_pic(pic);
 675                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 676                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 677                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 678                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 679                 reset_pic();
 680                 break;
 681         }
 682
 683         case PERFCTR_CLRPIC:
 684                 if (!test_thread_flag(TIF_PERFCTR)) {
 685                         err = -EINVAL;
 686                         break;
 687                 }
 688                 current_thread_info()->kernel_cntd0 =
 689                         current_thread_info()->kernel_cntd1 = 0;
 690                 reset_pic();
 691                 break;
 692
 693         case PERFCTR_SETPCR: {
 694                 u64 __user *user_pcr = (u64 __user *)arg0;
 695
 696                 if (!test_thread_flag(TIF_PERFCTR)) {
 697                         err = -EINVAL;
 698                         break;
 699                 }
 700                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 701                 write_pcr(current_thread_info()->pcr_reg);
 702                 current_thread_info()->kernel_cntd0 =
 703                         current_thread_info()->kernel_cntd1 = 0;
 704                 reset_pic();
 705                 break;
 706         }
 707
 708         case PERFCTR_GETPCR: {
 709                 u64 __user *user_pcr = (u64 __user *)arg0;
 710
 711                 if (!test_thread_flag(TIF_PERFCTR)) {
 712                         err = -EINVAL;
 713                         break;
 714                 }
 715                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 716                 break;
 717         }
 718
 719         default:
 720                 err = -EINVAL;
 721                 break;
 722         };
 723         return err;
 724 }