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, 0);
 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, 0);
 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, 0);
 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, int second, unsigned long third, void __user *ptr, long fifth)
 203 {
 204         int err;
 205
 206         /* No need for backward compatibility. We can start fresh... */
 207         if (call <= SEMCTL) {
 208                 switch (call) {
 209                 case SEMOP:
 210                         err = sys_semtimedop(first, ptr, second, NULL);
 211                         goto out;
 212                 case SEMTIMEDOP:
 213                         err = sys_semtimedop(first, ptr, second,
 214                                 (const struct timespec __user *) fifth);
 215                         goto out;
 216                 case SEMGET:
 217                         err = sys_semget(first, second, (int)third);
 218                         goto out;
 219                 case SEMCTL: {
 220                         union semun fourth;
 221                         err = -EINVAL;
 222                         if (!ptr)
 223                                 goto out;
 224                         err = -EFAULT;
 225                         if (get_user(fourth.__pad,
 226                                      (void __user * __user *) ptr))
 227                                 goto out;
 228                         err = sys_semctl(first, second | IPC_64,
 229                                          (int)third, fourth);
 230                         goto out;
 231                 }
 232                 default:
 233                         err = -ENOSYS;
 234                         goto out;
 235                 };
 236         }
 237         if (call <= MSGCTL) {
 238                 switch (call) {
 239                 case MSGSND:
 240                         err = sys_msgsnd(first, ptr, second, (int)third);
 241                         goto out;
 242                 case MSGRCV:
 243                         err = sys_msgrcv(first, ptr, second, fifth,
 244                                          (int)third);
 245                         goto out;
 246                 case MSGGET:
 247                         err = sys_msgget((key_t) first, second);
 248                         goto out;
 249                 case MSGCTL:
 250                         err = sys_msgctl(first, second | IPC_64, ptr);
 251                         goto out;
 252                 default:
 253                         err = -ENOSYS;
 254                         goto out;
 255                 };
 256         }
 257         if (call <= SHMCTL) {
 258                 switch (call) {
 259                 case SHMAT: {
 260                         ulong raddr;
 261                         err = do_shmat(first, ptr, second, &raddr);
 262                         if (!err) {
 263                                 if (put_user(raddr,
 264                                              (ulong __user *) third))
 265                                         err = -EFAULT;
 266                         }
 267                         goto out;
 268                 }
 269                 case SHMDT:
 270                         err = sys_shmdt(ptr);
 271                         goto out;
 272                 case SHMGET:
 273                         err = sys_shmget(first, second, (int)third);
 274                         goto out;
 275                 case SHMCTL:
 276                         err = sys_shmctl(first, second | IPC_64, ptr);
 277                         goto out;
 278                 default:
 279                         err = -ENOSYS;
 280                         goto out;
 281                 };
 282         } else {
 283                 err = -ENOSYS;
 284         }
 285 out:
 286         return err;
 287 }
 288
 289 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 290 {
 291         int ret = sys_newuname(name);
 292
 293         if (current->personality == PER_LINUX32 && !ret) {
 294                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 295                        ? -EFAULT : 0);
 296         }
 297         return ret;
 298 }
 299
 300 asmlinkage long sparc64_personality(unsigned long personality)
 301 {
 302         int ret;
 303
 304         if (current->personality == PER_LINUX32 &&
 305             personality == PER_LINUX)
 306                 personality = PER_LINUX32;
 307         ret = sys_personality(personality);
 308         if (ret == PER_LINUX32)
 309                 ret = PER_LINUX;
 310
 311         return ret;
 312 }
 313
 314 /* Linux version of mmap */
 315 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 316         unsigned long prot, unsigned long flags, unsigned long fd,
 317         unsigned long off)
 318 {
 319         struct file * file = NULL;
 320         unsigned long retval = -EBADF;
 321
 322         if (!(flags & MAP_ANONYMOUS)) {
 323                 file = fget(fd);
 324                 if (!file)
 325                         goto out;
 326         }
 327         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 328         len = PAGE_ALIGN(len);
 329         retval = -EINVAL;
 330
 331         if (test_thread_flag(TIF_32BIT)) {
 332                 if (len > 0xf0000000UL ||
 333                     ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
 334                         goto out_putf;
 335         } else {
 336                 if (len > -PAGE_OFFSET ||
 337                     ((flags & MAP_FIXED) &&
 338                      addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
 339                         goto out_putf;
 340         }
 341
 342         down_write(&current->mm->mmap_sem);
 343         retval = do_mmap(file, addr, len, prot, flags, off);
 344         up_write(&current->mm->mmap_sem);
 345
 346 out_putf:
 347         if (file)
 348                 fput(file);
 349 out:
 350         return retval;
 351 }
 352
 353 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 354 {
 355         long ret;
 356
 357         if (len > -PAGE_OFFSET ||
 358             (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
 359                 return -EINVAL;
 360         down_write(&current->mm->mmap_sem);
 361         ret = do_munmap(current->mm, addr, len);
 362         up_write(&current->mm->mmap_sem);
 363         return ret;
 364 }
 365
 366 extern unsigned long do_mremap(unsigned long addr,
 367         unsigned long old_len, unsigned long new_len,
 368         unsigned long flags, unsigned long new_addr);
 369
 370 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 371         unsigned long old_len, unsigned long new_len,
 372         unsigned long flags, unsigned long new_addr)
 373 {
 374         struct vm_area_struct *vma;
 375         unsigned long ret = -EINVAL;
 376         if (test_thread_flag(TIF_32BIT))
 377                 goto out;
 378         if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
 379                 goto out;
 380         if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
 381                 goto out;
 382         down_write(&current->mm->mmap_sem);
 383         if (flags & MREMAP_FIXED) {
 384                 if (new_addr < PAGE_OFFSET &&
 385                     new_addr + new_len > -PAGE_OFFSET)
 386                         goto out_sem;
 387         } else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
 388                 unsigned long map_flags = 0;
 389                 struct file *file = NULL;
 390
 391                 ret = -ENOMEM;
 392                 if (!(flags & MREMAP_MAYMOVE))
 393                         goto out_sem;
 394
 395                 vma = find_vma(current->mm, addr);
 396                 if (vma) {
 397                         if (vma->vm_flags & VM_SHARED)
 398                                 map_flags |= MAP_SHARED;
 399                         file = vma->vm_file;
 400                 }
 401
 402                 /* MREMAP_FIXED checked above. */
 403                 new_addr = get_unmapped_area(file, addr, new_len,
 404                                     vma ? vma->vm_pgoff : 0,
 405                                     map_flags, vma->vm_flags & VM_EXEC);
 406                 ret = new_addr;
 407                 if (new_addr & ~PAGE_MASK)
 408                         goto out_sem;
 409                 flags |= MREMAP_FIXED;
 410         }
 411         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 412 out_sem:
 413         up_write(&current->mm->mmap_sem);
 414 out:
 415         return ret;
 416 }
 417
 418 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 419 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 420 {
 421         static int count;
 422
 423         /* Don't make the system unusable, if someone goes stuck */
 424         if (count++ > 5)
 425                 return -ENOSYS;
 426
 427         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 428 #ifdef DEBUG_UNIMP_SYSCALL
 429         show_regs (regs);
 430 #endif
 431
 432         return -ENOSYS;
 433 }
 434
 435 /* #define DEBUG_SPARC_BREAKPOINT */
 436
 437 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 438 {
 439         siginfo_t info;
 440
 441         if (test_thread_flag(TIF_32BIT)) {
 442                 regs->tpc &= 0xffffffff;
 443                 regs->tnpc &= 0xffffffff;
 444         }
 445 #ifdef DEBUG_SPARC_BREAKPOINT
 446         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 447 #endif
 448         info.si_signo = SIGTRAP;
 449         info.si_errno = 0;
 450         info.si_code = TRAP_BRKPT;
 451         info.si_addr = (void *)regs->tpc;
 452         info.si_trapno = 0;
 453         force_sig_info(SIGTRAP, &info, current);
 454 #ifdef DEBUG_SPARC_BREAKPOINT
 455         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 456 #endif
 457 }
 458
 459 extern void check_pending(int signum);
 460
 461 asmlinkage long sys_getdomainname(char __user *name, int len)
 462 {
 463         int nlen;
 464         int err = -EFAULT;
 465
 466         down_read(&uts_sem);
 467
 468         nlen = strlen(vx_new_uts(domainname)) + 1;
 469
 470         if (nlen < len)
 471                 len = nlen;
 472         if (len > __NEW_UTS_LEN)
 473                 goto done;
 474         if (copy_to_user(name, vx_new_uts(domainname), len))
 475                 goto done;
 476         err = 0;
 477 done:
 478         up_read(&uts_sem);
 479         return err;
 480 }
 481
 482 asmlinkage long solaris_syscall(struct pt_regs *regs)
 483 {
 484         static int count;
 485
 486         regs->tpc = regs->tnpc;
 487         regs->tnpc += 4;
 488         if (test_thread_flag(TIF_32BIT)) {
 489                 regs->tpc &= 0xffffffff;
 490                 regs->tnpc &= 0xffffffff;
 491         }
 492         if (++count <= 5) {
 493                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 494                 show_regs (regs);
 495         }
 496         send_sig(SIGSEGV, current, 1);
 497
 498         return -ENOSYS;
 499 }
 500
 501 #ifndef CONFIG_SUNOS_EMUL
 502 asmlinkage long sunos_syscall(struct pt_regs *regs)
 503 {
 504         static int count;
 505
 506         regs->tpc = regs->tnpc;
 507         regs->tnpc += 4;
 508         if (test_thread_flag(TIF_32BIT)) {
 509                 regs->tpc &= 0xffffffff;
 510                 regs->tnpc &= 0xffffffff;
 511         }
 512         if (++count <= 20)
 513                 printk ("SunOS binary emulation not compiled in\n");
 514         force_sig(SIGSEGV, current);
 515
 516         return -ENOSYS;
 517 }
 518 #endif
 519
 520 asmlinkage long sys_utrap_install(utrap_entry_t type,
 521                                   utrap_handler_t new_p,
 522                                   utrap_handler_t new_d,
 523                                   utrap_handler_t __user *old_p,
 524                                   utrap_handler_t __user *old_d)
 525 {
 526         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 527                 return -EINVAL;
 528         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 529                 if (old_p) {
 530                         if (!current_thread_info()->utraps) {
 531                                 if (put_user(NULL, old_p))
 532                                         return -EFAULT;
 533                         } else {
 534                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 535                                         return -EFAULT;
 536                         }
 537                 }
 538                 if (old_d) {
 539                         if (put_user(NULL, old_d))
 540                                 return -EFAULT;
 541                 }
 542                 return 0;
 543         }
 544         if (!current_thread_info()->utraps) {
 545                 current_thread_info()->utraps =
 546                         kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 547                 if (!current_thread_info()->utraps)
 548                         return -ENOMEM;
 549                 current_thread_info()->utraps[0] = 1;
 550                 memset(current_thread_info()->utraps+1, 0,
 551                        UT_TRAP_INSTRUCTION_31*sizeof(long));
 552         } else {
 553                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 554                     current_thread_info()->utraps[0] > 1) {
 555                         long *p = current_thread_info()->utraps;
 556
 557                         current_thread_info()->utraps =
 558                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 559                                         GFP_KERNEL);
 560                         if (!current_thread_info()->utraps) {
 561                                 current_thread_info()->utraps = p;
 562                                 return -ENOMEM;
 563                         }
 564                         p[0]--;
 565                         current_thread_info()->utraps[0] = 1;
 566                         memcpy(current_thread_info()->utraps+1, p+1,
 567                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 568                 }
 569         }
 570         if (old_p) {
 571                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 572                         return -EFAULT;
 573         }
 574         if (old_d) {
 575                 if (put_user(NULL, old_d))
 576                         return -EFAULT;
 577         }
 578         current_thread_info()->utraps[type] = (long)new_p;
 579
 580         return 0;
 581 }
 582
 583 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 584 {
 585         if (model >= 3)
 586                 return -EINVAL;
 587         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 588         return 0;
 589 }
 590
 591 asmlinkage long sys_rt_sigaction(int sig,
 592                                  const struct sigaction __user *act,
 593                                  struct sigaction __user *oact,
 594                                  void __user *restorer,
 595                                  size_t sigsetsize)
 596 {
 597         struct k_sigaction new_ka, old_ka;
 598         int ret;
 599
 600         /* XXX: Don't preclude handling different sized sigset_t's.  */
 601         if (sigsetsize != sizeof(sigset_t))
 602                 return -EINVAL;
 603
 604         if (act) {
 605                 new_ka.ka_restorer = restorer;
 606                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 607                         return -EFAULT;
 608         }
 609
 610         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 611
 612         if (!ret && oact) {
 613                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 614                         return -EFAULT;
 615         }
 616
 617         return ret;
 618 }
 619
 620 /* Invoked by rtrap code to update performance counters in
 621  * user space.
 622  */
 623 asmlinkage void update_perfctrs(void)
 624 {
 625         unsigned long pic, tmp;
 626
 627         read_pic(pic);
 628         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 629         __put_user(tmp, current_thread_info()->user_cntd0);
 630         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 631         __put_user(tmp, current_thread_info()->user_cntd1);
 632         reset_pic();
 633 }
 634
 635 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 636 {
 637         int err = 0;
 638
 639         switch(opcode) {
 640         case PERFCTR_ON:
 641                 current_thread_info()->pcr_reg = arg2;
 642                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 643                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 644                 current_thread_info()->kernel_cntd0 =
 645                         current_thread_info()->kernel_cntd1 = 0;
 646                 write_pcr(arg2);
 647                 reset_pic();
 648                 set_thread_flag(TIF_PERFCTR);
 649                 break;
 650
 651         case PERFCTR_OFF:
 652                 err = -EINVAL;
 653                 if (test_thread_flag(TIF_PERFCTR)) {
 654                         current_thread_info()->user_cntd0 =
 655                                 current_thread_info()->user_cntd1 = NULL;
 656                         current_thread_info()->pcr_reg = 0;
 657                         write_pcr(0);
 658                         clear_thread_flag(TIF_PERFCTR);
 659                         err = 0;
 660                 }
 661                 break;
 662
 663         case PERFCTR_READ: {
 664                 unsigned long pic, tmp;
 665
 666                 if (!test_thread_flag(TIF_PERFCTR)) {
 667                         err = -EINVAL;
 668                         break;
 669                 }
 670                 read_pic(pic);
 671                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 672                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 673                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 674                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 675                 reset_pic();
 676                 break;
 677         }
 678
 679         case PERFCTR_CLRPIC:
 680                 if (!test_thread_flag(TIF_PERFCTR)) {
 681                         err = -EINVAL;
 682                         break;
 683                 }
 684                 current_thread_info()->kernel_cntd0 =
 685                         current_thread_info()->kernel_cntd1 = 0;
 686                 reset_pic();
 687                 break;
 688
 689         case PERFCTR_SETPCR: {
 690                 u64 __user *user_pcr = (u64 __user *)arg0;
 691
 692                 if (!test_thread_flag(TIF_PERFCTR)) {
 693                         err = -EINVAL;
 694                         break;
 695                 }
 696                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 697                 write_pcr(current_thread_info()->pcr_reg);
 698                 current_thread_info()->kernel_cntd0 =
 699                         current_thread_info()->kernel_cntd1 = 0;
 700                 reset_pic();
 701                 break;
 702         }
 703
 704         case PERFCTR_GETPCR: {
 705                 u64 __user *user_pcr = (u64 __user *)arg0;
 706
 707                 if (!test_thread_flag(TIF_PERFCTR)) {
 708                         err = -EINVAL;
 709                         break;
 710                 }
 711                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 712                 break;
 713         }
 714
 715         default:
 716                 err = -EINVAL;
 717                 break;
 718         };
 719         return err;
 720 }