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