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 #include <asm/a.out.h>
  34
  35 /* #define DEBUG_UNIMP_SYSCALL */
  36
  37 asmlinkage unsigned long sys_getpagesize(void)
  38 {
  39         return PAGE_SIZE;
  40 }
  41
  42 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
  43 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
  44
  45 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  46  * overflow past the end of the 64-bit address space?
  47  */
  48 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  49 {
  50         unsigned long va_exclude_start, va_exclude_end;
  51
  52         va_exclude_start = VA_EXCLUDE_START;
  53         va_exclude_end   = VA_EXCLUDE_END;
  54
  55         if (unlikely(len >= va_exclude_start))
  56                 return 1;
  57
  58         if (unlikely((addr + len) < addr))
  59                 return 1;
  60
  61         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  62                      ((addr + len) >= va_exclude_start &&
  63                       (addr + len) < va_exclude_end)))
  64                 return 1;
  65
  66         return 0;
  67 }
  68
  69 /* Does start,end straddle the VA-space hole?  */
  70 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  71 {
  72         unsigned long va_exclude_start, va_exclude_end;
  73
  74         va_exclude_start = VA_EXCLUDE_START;
  75         va_exclude_end   = VA_EXCLUDE_END;
  76
  77         if (likely(start < va_exclude_start && end < va_exclude_start))
  78                 return 0;
  79
  80         if (likely(start >= va_exclude_end && end >= va_exclude_end))
  81                 return 0;
  82
  83         return 1;
  84 }
  85
  86 /* These functions differ from the default implementations in
  87  * mm/mmap.c in two ways:
  88  *
  89  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  90  *    for fixed such mappings we just validate what the user gave us.
  91  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  92  *    the spitfire/niagara VA-hole.
  93  */
  94
  95 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  96                                          unsigned long pgoff)
  97 {
  98         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  99         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 100
 101         return base + off;
 102 }
 103
 104 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 105                                               unsigned long pgoff)
 106 {
 107         unsigned long base = addr & ~(SHMLBA-1);
 108         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 109
 110         if (base + off <= addr)
 111                 return base + off;
 112         return base - off;
 113 }
 114
 115 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 116 {
 117         struct mm_struct *mm = current->mm;
 118         struct vm_area_struct * vma;
 119         unsigned long task_size = TASK_SIZE;
 120         unsigned long start_addr;
 121         int do_color_align;
 122
 123         if (flags & MAP_FIXED) {
 124                 /* We do not accept a shared mapping if it would violate
 125                  * cache aliasing constraints.
 126                  */
 127                 if ((flags & MAP_SHARED) &&
 128                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 129                         return -EINVAL;
 130                 return addr;
 131         }
 132
 133         if (test_thread_flag(TIF_32BIT))
 134                 task_size = STACK_TOP32;
 135         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 136                 return -ENOMEM;
 137
 138         do_color_align = 0;
 139         if (filp || (flags & MAP_SHARED))
 140                 do_color_align = 1;
 141
 142         if (addr) {
 143                 if (do_color_align)
 144                         addr = COLOUR_ALIGN(addr, pgoff);
 145                 else
 146                         addr = PAGE_ALIGN(addr);
 147
 148                 vma = find_vma(mm, addr);
 149                 if (task_size - len >= addr &&
 150                     (!vma || addr + len <= vma->vm_start))
 151                         return addr;
 152         }
 153
 154         if (len > mm->cached_hole_size) {
 155                 start_addr = addr = mm->free_area_cache;
 156         } else {
 157                 start_addr = addr = TASK_UNMAPPED_BASE;
 158                 mm->cached_hole_size = 0;
 159         }
 160
 161         task_size -= len;
 162
 163 full_search:
 164         if (do_color_align)
 165                 addr = COLOUR_ALIGN(addr, pgoff);
 166         else
 167                 addr = PAGE_ALIGN(addr);
 168
 169         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 170                 /* At this point:  (!vma || addr < vma->vm_end). */
 171                 if (addr < VA_EXCLUDE_START &&
 172                     (addr + len) >= VA_EXCLUDE_START) {
 173                         addr = VA_EXCLUDE_END;
 174                         vma = find_vma(mm, VA_EXCLUDE_END);
 175                 }
 176                 if (unlikely(task_size < addr)) {
 177                         if (start_addr != TASK_UNMAPPED_BASE) {
 178                                 start_addr = addr = TASK_UNMAPPED_BASE;
 179                                 mm->cached_hole_size = 0;
 180                                 goto full_search;
 181                         }
 182                         return -ENOMEM;
 183                 }
 184                 if (likely(!vma || addr + len <= vma->vm_start)) {
 185                         /*
 186                          * Remember the place where we stopped the search:
 187                          */
 188                         mm->free_area_cache = addr + len;
 189                         return addr;
 190                 }
 191                 if (addr + mm->cached_hole_size < vma->vm_start)
 192                         mm->cached_hole_size = vma->vm_start - addr;
 193
 194                 addr = vma->vm_end;
 195                 if (do_color_align)
 196                         addr = COLOUR_ALIGN(addr, pgoff);
 197         }
 198 }
 199
 200 unsigned long
 201 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 202                           const unsigned long len, const unsigned long pgoff,
 203                           const unsigned long flags)
 204 {
 205         struct vm_area_struct *vma;
 206         struct mm_struct *mm = current->mm;
 207         unsigned long task_size = STACK_TOP32;
 208         unsigned long addr = addr0;
 209         int do_color_align;
 210
 211         /* This should only ever run for 32-bit processes.  */
 212         BUG_ON(!test_thread_flag(TIF_32BIT));
 213
 214         if (flags & MAP_FIXED) {
 215                 /* We do not accept a shared mapping if it would violate
 216                  * cache aliasing constraints.
 217                  */
 218                 if ((flags & MAP_SHARED) &&
 219                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 220                         return -EINVAL;
 221                 return addr;
 222         }
 223
 224         if (unlikely(len > task_size))
 225                 return -ENOMEM;
 226
 227         do_color_align = 0;
 228         if (filp || (flags & MAP_SHARED))
 229                 do_color_align = 1;
 230
 231         /* requesting a specific address */
 232         if (addr) {
 233                 if (do_color_align)
 234                         addr = COLOUR_ALIGN(addr, pgoff);
 235                 else
 236                         addr = PAGE_ALIGN(addr);
 237
 238                 vma = find_vma(mm, addr);
 239                 if (task_size - len >= addr &&
 240                     (!vma || addr + len <= vma->vm_start))
 241                         return addr;
 242         }
 243
 244         /* check if free_area_cache is useful for us */
 245         if (len <= mm->cached_hole_size) {
 246                 mm->cached_hole_size = 0;
 247                 mm->free_area_cache = mm->mmap_base;
 248         }
 249
 250         /* either no address requested or can't fit in requested address hole */
 251         addr = mm->free_area_cache;
 252         if (do_color_align) {
 253                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 254
 255                 addr = base + len;
 256         }
 257
 258         /* make sure it can fit in the remaining address space */
 259         if (likely(addr > len)) {
 260                 vma = find_vma(mm, addr-len);
 261                 if (!vma || addr <= vma->vm_start) {
 262                         /* remember the address as a hint for next time */
 263                         return (mm->free_area_cache = addr-len);
 264                 }
 265         }
 266
 267         if (unlikely(mm->mmap_base < len))
 268                 goto bottomup;
 269
 270         addr = mm->mmap_base-len;
 271         if (do_color_align)
 272                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 273
 274         do {
 275                 /*
 276                  * Lookup failure means no vma is above this address,
 277                  * else if new region fits below vma->vm_start,
 278                  * return with success:
 279                  */
 280                 vma = find_vma(mm, addr);
 281                 if (likely(!vma || addr+len <= vma->vm_start)) {
 282                         /* remember the address as a hint for next time */
 283                         return (mm->free_area_cache = addr);
 284                 }
 285
 286                 /* remember the largest hole we saw so far */
 287                 if (addr + mm->cached_hole_size < vma->vm_start)
 288                         mm->cached_hole_size = vma->vm_start - addr;
 289
 290                 /* try just below the current vma->vm_start */
 291                 addr = vma->vm_start-len;
 292                 if (do_color_align)
 293                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 294         } while (likely(len < vma->vm_start));
 295
 296 bottomup:
 297         /*
 298          * A failed mmap() very likely causes application failure,
 299          * so fall back to the bottom-up function here. This scenario
 300          * can happen with large stack limits and large mmap()
 301          * allocations.
 302          */
 303         mm->cached_hole_size = ~0UL;
 304         mm->free_area_cache = TASK_UNMAPPED_BASE;
 305         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 306         /*
 307          * Restore the topdown base:
 308          */
 309         mm->free_area_cache = mm->mmap_base;
 310         mm->cached_hole_size = ~0UL;
 311
 312         return addr;
 313 }
 314
 315 /* Try to align mapping such that we align it as much as possible. */
 316 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 317 {
 318         unsigned long align_goal, addr = -ENOMEM;
 319
 320         if (flags & MAP_FIXED) {
 321                 /* Ok, don't mess with it. */
 322                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
 323         }
 324         flags &= ~MAP_SHARED;
 325
 326         align_goal = PAGE_SIZE;
 327         if (len >= (4UL * 1024 * 1024))
 328                 align_goal = (4UL * 1024 * 1024);
 329         else if (len >= (512UL * 1024))
 330                 align_goal = (512UL * 1024);
 331         else if (len >= (64UL * 1024))
 332                 align_goal = (64UL * 1024);
 333
 334         do {
 335                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 336                 if (!(addr & ~PAGE_MASK)) {
 337                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 338                         break;
 339                 }
 340
 341                 if (align_goal == (4UL * 1024 * 1024))
 342                         align_goal = (512UL * 1024);
 343                 else if (align_goal == (512UL * 1024))
 344                         align_goal = (64UL * 1024);
 345                 else
 346                         align_goal = PAGE_SIZE;
 347         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 348
 349         /* Mapping is smaller than 64K or larger areas could not
 350          * be obtained.
 351          */
 352         if (addr & ~PAGE_MASK)
 353                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 354
 355         return addr;
 356 }
 357
 358 /* Essentially the same as PowerPC... */
 359 void arch_pick_mmap_layout(struct mm_struct *mm)
 360 {
 361         /*
 362          * Fall back to the standard layout if the personality
 363          * bit is set, or if the expected stack growth is unlimited:
 364          */
 365         if (!test_thread_flag(TIF_32BIT) ||
 366             (current->personality & ADDR_COMPAT_LAYOUT) ||
 367             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 368             sysctl_legacy_va_layout) {
 369                 mm->mmap_base = TASK_UNMAPPED_BASE;
 370                 mm->get_unmapped_area = arch_get_unmapped_area;
 371                 mm->unmap_area = arch_unmap_area;
 372         } else {
 373                 /* We know it's 32-bit */
 374                 unsigned long task_size = STACK_TOP32;
 375                 unsigned long gap;
 376
 377                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 378                 if (gap < 128 * 1024 * 1024)
 379                         gap = 128 * 1024 * 1024;
 380                 if (gap > (task_size / 6 * 5))
 381                         gap = (task_size / 6 * 5);
 382
 383                 mm->mmap_base = task_size - (gap & PAGE_MASK);
 384                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 385                 mm->unmap_area = arch_unmap_area_topdown;
 386         }
 387 }
 388
 389 asmlinkage unsigned long sparc_brk(unsigned long brk)
 390 {
 391         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 392         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 393                 return current->mm->brk;
 394
 395         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 396                 return current->mm->brk;
 397
 398         return sys_brk(brk);
 399 }
 400
 401 /*
 402  * sys_pipe() is the normal C calling standard for creating
 403  * a pipe. It's not the way unix traditionally does this, though.
 404  */
 405 asmlinkage long sparc_pipe(struct pt_regs *regs)
 406 {
 407         int fd[2];
 408         int error;
 409
 410         error = do_pipe(fd);
 411         if (error)
 412                 goto out;
 413         regs->u_regs[UREG_I1] = fd[1];
 414         error = fd[0];
 415 out:
 416         return error;
 417 }
 418
 419 /*
 420  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 421  *
 422  * This is really horribly ugly.
 423  */
 424
 425 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 426                         unsigned long third, void __user *ptr, long fifth)
 427 {
 428         int err;
 429
 430         /* No need for backward compatibility. We can start fresh... */
 431         if (call <= SEMCTL) {
 432                 switch (call) {
 433                 case SEMOP:
 434                         err = sys_semtimedop(first, ptr,
 435                                              (unsigned)second, NULL);
 436                         goto out;
 437                 case SEMTIMEDOP:
 438                         err = sys_semtimedop(first, ptr, (unsigned)second,
 439                                 (const struct timespec __user *) fifth);
 440                         goto out;
 441                 case SEMGET:
 442                         err = sys_semget(first, (int)second, (int)third);
 443                         goto out;
 444                 case SEMCTL: {
 445                         union semun fourth;
 446                         err = -EINVAL;
 447                         if (!ptr)
 448                                 goto out;
 449                         err = -EFAULT;
 450                         if (get_user(fourth.__pad,
 451                                      (void __user * __user *) ptr))
 452                                 goto out;
 453                         err = sys_semctl(first, (int)second | IPC_64,
 454                                          (int)third, fourth);
 455                         goto out;
 456                 }
 457                 default:
 458                         err = -ENOSYS;
 459                         goto out;
 460                 };
 461         }
 462         if (call <= MSGCTL) {
 463                 switch (call) {
 464                 case MSGSND:
 465                         err = sys_msgsnd(first, ptr, (size_t)second,
 466                                          (int)third);
 467                         goto out;
 468                 case MSGRCV:
 469                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 470                                          (int)third);
 471                         goto out;
 472                 case MSGGET:
 473                         err = sys_msgget((key_t)first, (int)second);
 474                         goto out;
 475                 case MSGCTL:
 476                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 477                         goto out;
 478                 default:
 479                         err = -ENOSYS;
 480                         goto out;
 481                 };
 482         }
 483         if (call <= SHMCTL) {
 484                 switch (call) {
 485                 case SHMAT: {
 486                         ulong raddr;
 487                         err = do_shmat(first, ptr, (int)second, &raddr);
 488                         if (!err) {
 489                                 if (put_user(raddr,
 490                                              (ulong __user *) third))
 491                                         err = -EFAULT;
 492                         }
 493                         goto out;
 494                 }
 495                 case SHMDT:
 496                         err = sys_shmdt(ptr);
 497                         goto out;
 498                 case SHMGET:
 499                         err = sys_shmget(first, (size_t)second, (int)third);
 500                         goto out;
 501                 case SHMCTL:
 502                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 503                         goto out;
 504                 default:
 505                         err = -ENOSYS;
 506                         goto out;
 507                 };
 508         } else {
 509                 err = -ENOSYS;
 510         }
 511 out:
 512         return err;
 513 }
 514
 515 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 516 {
 517         int ret = sys_newuname(name);
 518
 519         if (current->personality == PER_LINUX32 && !ret) {
 520                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 521                        ? -EFAULT : 0);
 522         }
 523         return ret;
 524 }
 525
 526 asmlinkage long sparc64_personality(unsigned long personality)
 527 {
 528         int ret;
 529
 530         if (current->personality == PER_LINUX32 &&
 531             personality == PER_LINUX)
 532                 personality = PER_LINUX32;
 533         ret = sys_personality(personality);
 534         if (ret == PER_LINUX32)
 535                 ret = PER_LINUX;
 536
 537         return ret;
 538 }
 539
 540 /* Linux version of mmap */
 541 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 542         unsigned long prot, unsigned long flags, unsigned long fd,
 543         unsigned long off)
 544 {
 545         struct file * file = NULL;
 546         unsigned long retval = -EBADF;
 547
 548         if (!(flags & MAP_ANONYMOUS)) {
 549                 file = fget(fd);
 550                 if (!file)
 551                         goto out;
 552         }
 553         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 554         len = PAGE_ALIGN(len);
 555         retval = -EINVAL;
 556
 557         if (test_thread_flag(TIF_32BIT)) {
 558                 if (len >= STACK_TOP32)
 559                         goto out_putf;
 560
 561                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 562                         goto out_putf;
 563         } else {
 564                 if (len >= VA_EXCLUDE_START)
 565                         goto out_putf;
 566
 567                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 568                         goto out_putf;
 569         }
 570
 571         down_write(&current->mm->mmap_sem);
 572         retval = do_mmap(file, addr, len, prot, flags, off);
 573         up_write(&current->mm->mmap_sem);
 574
 575 out_putf:
 576         if (file)
 577                 fput(file);
 578 out:
 579         return retval;
 580 }
 581
 582 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 583 {
 584         long ret;
 585
 586         if (invalid_64bit_range(addr, len))
 587                 return -EINVAL;
 588
 589         down_write(&current->mm->mmap_sem);
 590         ret = do_munmap(current->mm, addr, len);
 591         up_write(&current->mm->mmap_sem);
 592         return ret;
 593 }
 594
 595 extern unsigned long do_mremap(unsigned long addr,
 596         unsigned long old_len, unsigned long new_len,
 597         unsigned long flags, unsigned long new_addr);
 598
 599 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 600         unsigned long old_len, unsigned long new_len,
 601         unsigned long flags, unsigned long new_addr)
 602 {
 603         struct vm_area_struct *vma;
 604         unsigned long ret = -EINVAL;
 605
 606         if (test_thread_flag(TIF_32BIT))
 607                 goto out;
 608         if (unlikely(new_len >= VA_EXCLUDE_START))
 609                 goto out;
 610         if (unlikely(invalid_64bit_range(addr, old_len)))
 611                 goto out;
 612
 613         down_write(&current->mm->mmap_sem);
 614         if (flags & MREMAP_FIXED) {
 615                 if (invalid_64bit_range(new_addr, new_len))
 616                         goto out_sem;
 617         } else if (invalid_64bit_range(addr, new_len)) {
 618                 unsigned long map_flags = 0;
 619                 struct file *file = NULL;
 620
 621                 ret = -ENOMEM;
 622                 if (!(flags & MREMAP_MAYMOVE))
 623                         goto out_sem;
 624
 625                 vma = find_vma(current->mm, addr);
 626                 if (vma) {
 627                         if (vma->vm_flags & VM_SHARED)
 628                                 map_flags |= MAP_SHARED;
 629                         file = vma->vm_file;
 630                 }
 631
 632                 /* MREMAP_FIXED checked above. */
 633                 new_addr = get_unmapped_area(file, addr, new_len,
 634                                     vma ? vma->vm_pgoff : 0,
 635                                     map_flags);
 636                 ret = new_addr;
 637                 if (new_addr & ~PAGE_MASK)
 638                         goto out_sem;
 639                 flags |= MREMAP_FIXED;
 640         }
 641         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 642 out_sem:
 643         up_write(&current->mm->mmap_sem);
 644 out:
 645         return ret;
 646 }
 647
 648 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 649 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 650 {
 651         static int count;
 652
 653         /* Don't make the system unusable, if someone goes stuck */
 654         if (count++ > 5)
 655                 return -ENOSYS;
 656
 657         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 658 #ifdef DEBUG_UNIMP_SYSCALL
 659         show_regs (regs);
 660 #endif
 661
 662         return -ENOSYS;
 663 }
 664
 665 /* #define DEBUG_SPARC_BREAKPOINT */
 666
 667 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 668 {
 669         siginfo_t info;
 670
 671         if (test_thread_flag(TIF_32BIT)) {
 672                 regs->tpc &= 0xffffffff;
 673                 regs->tnpc &= 0xffffffff;
 674         }
 675 #ifdef DEBUG_SPARC_BREAKPOINT
 676         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 677 #endif
 678         info.si_signo = SIGTRAP;
 679         info.si_errno = 0;
 680         info.si_code = TRAP_BRKPT;
 681         info.si_addr = (void __user *)regs->tpc;
 682         info.si_trapno = 0;
 683         force_sig_info(SIGTRAP, &info, current);
 684 #ifdef DEBUG_SPARC_BREAKPOINT
 685         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 686 #endif
 687 }
 688
 689 extern void check_pending(int signum);
 690
 691 asmlinkage long sys_getdomainname(char __user *name, int len)
 692 {
 693         int nlen;
 694         int err = -EFAULT;
 695
 696         down_read(&uts_sem);
 697
 698         nlen = strlen(system_utsname.domainname) + 1;
 699
 700         if (nlen < len)
 701                 len = nlen;
 702         if (len > __NEW_UTS_LEN)
 703                 goto done;
 704         if (copy_to_user(name, system_utsname.domainname, len))
 705                 goto done;
 706         err = 0;
 707 done:
 708         up_read(&uts_sem);
 709         return err;
 710 }
 711
 712 asmlinkage long solaris_syscall(struct pt_regs *regs)
 713 {
 714         static int count;
 715
 716         regs->tpc = regs->tnpc;
 717         regs->tnpc += 4;
 718         if (test_thread_flag(TIF_32BIT)) {
 719                 regs->tpc &= 0xffffffff;
 720                 regs->tnpc &= 0xffffffff;
 721         }
 722         if (++count <= 5) {
 723                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 724                 show_regs (regs);
 725         }
 726         send_sig(SIGSEGV, current, 1);
 727
 728         return -ENOSYS;
 729 }
 730
 731 #ifndef CONFIG_SUNOS_EMUL
 732 asmlinkage long sunos_syscall(struct pt_regs *regs)
 733 {
 734         static int count;
 735
 736         regs->tpc = regs->tnpc;
 737         regs->tnpc += 4;
 738         if (test_thread_flag(TIF_32BIT)) {
 739                 regs->tpc &= 0xffffffff;
 740                 regs->tnpc &= 0xffffffff;
 741         }
 742         if (++count <= 20)
 743                 printk ("SunOS binary emulation not compiled in\n");
 744         force_sig(SIGSEGV, current);
 745
 746         return -ENOSYS;
 747 }
 748 #endif
 749
 750 asmlinkage long sys_utrap_install(utrap_entry_t type,
 751                                   utrap_handler_t new_p,
 752                                   utrap_handler_t new_d,
 753                                   utrap_handler_t __user *old_p,
 754                                   utrap_handler_t __user *old_d)
 755 {
 756         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 757                 return -EINVAL;
 758         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 759                 if (old_p) {
 760                         if (!current_thread_info()->utraps) {
 761                                 if (put_user(NULL, old_p))
 762                                         return -EFAULT;
 763                         } else {
 764                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 765                                         return -EFAULT;
 766                         }
 767                 }
 768                 if (old_d) {
 769                         if (put_user(NULL, old_d))
 770                                 return -EFAULT;
 771                 }
 772                 return 0;
 773         }
 774         if (!current_thread_info()->utraps) {
 775                 current_thread_info()->utraps =
 776                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 777                 if (!current_thread_info()->utraps)
 778                         return -ENOMEM;
 779                 current_thread_info()->utraps[0] = 1;
 780         } else {
 781                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 782                     current_thread_info()->utraps[0] > 1) {
 783                         long *p = current_thread_info()->utraps;
 784
 785                         current_thread_info()->utraps =
 786                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 787                                         GFP_KERNEL);
 788                         if (!current_thread_info()->utraps) {
 789                                 current_thread_info()->utraps = p;
 790                                 return -ENOMEM;
 791                         }
 792                         p[0]--;
 793                         current_thread_info()->utraps[0] = 1;
 794                         memcpy(current_thread_info()->utraps+1, p+1,
 795                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 796                 }
 797         }
 798         if (old_p) {
 799                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 800                         return -EFAULT;
 801         }
 802         if (old_d) {
 803                 if (put_user(NULL, old_d))
 804                         return -EFAULT;
 805         }
 806         current_thread_info()->utraps[type] = (long)new_p;
 807
 808         return 0;
 809 }
 810
 811 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 812 {
 813         if (model >= 3)
 814                 return -EINVAL;
 815         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 816         return 0;
 817 }
 818
 819 asmlinkage long sys_rt_sigaction(int sig,
 820                                  const struct sigaction __user *act,
 821                                  struct sigaction __user *oact,
 822                                  void __user *restorer,
 823                                  size_t sigsetsize)
 824 {
 825         struct k_sigaction new_ka, old_ka;
 826         int ret;
 827
 828         /* XXX: Don't preclude handling different sized sigset_t's.  */
 829         if (sigsetsize != sizeof(sigset_t))
 830                 return -EINVAL;
 831
 832         if (act) {
 833                 new_ka.ka_restorer = restorer;
 834                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 835                         return -EFAULT;
 836         }
 837
 838         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 839
 840         if (!ret && oact) {
 841                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 842                         return -EFAULT;
 843         }
 844
 845         return ret;
 846 }
 847
 848 /* Invoked by rtrap code to update performance counters in
 849  * user space.
 850  */
 851 asmlinkage void update_perfctrs(void)
 852 {
 853         unsigned long pic, tmp;
 854
 855         read_pic(pic);
 856         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 857         __put_user(tmp, current_thread_info()->user_cntd0);
 858         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 859         __put_user(tmp, current_thread_info()->user_cntd1);
 860         reset_pic();
 861 }
 862
 863 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 864 {
 865         int err = 0;
 866
 867         switch(opcode) {
 868         case PERFCTR_ON:
 869                 current_thread_info()->pcr_reg = arg2;
 870                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 871                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 872                 current_thread_info()->kernel_cntd0 =
 873                         current_thread_info()->kernel_cntd1 = 0;
 874                 write_pcr(arg2);
 875                 reset_pic();
 876                 set_thread_flag(TIF_PERFCTR);
 877                 break;
 878
 879         case PERFCTR_OFF:
 880                 err = -EINVAL;
 881                 if (test_thread_flag(TIF_PERFCTR)) {
 882                         current_thread_info()->user_cntd0 =
 883                                 current_thread_info()->user_cntd1 = NULL;
 884                         current_thread_info()->pcr_reg = 0;
 885                         write_pcr(0);
 886                         clear_thread_flag(TIF_PERFCTR);
 887                         err = 0;
 888                 }
 889                 break;
 890
 891         case PERFCTR_READ: {
 892                 unsigned long pic, tmp;
 893
 894                 if (!test_thread_flag(TIF_PERFCTR)) {
 895                         err = -EINVAL;
 896                         break;
 897                 }
 898                 read_pic(pic);
 899                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 900                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 901                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 902                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 903                 reset_pic();
 904                 break;
 905         }
 906
 907         case PERFCTR_CLRPIC:
 908                 if (!test_thread_flag(TIF_PERFCTR)) {
 909                         err = -EINVAL;
 910                         break;
 911                 }
 912                 current_thread_info()->kernel_cntd0 =
 913                         current_thread_info()->kernel_cntd1 = 0;
 914                 reset_pic();
 915                 break;
 916
 917         case PERFCTR_SETPCR: {
 918                 u64 __user *user_pcr = (u64 __user *)arg0;
 919
 920                 if (!test_thread_flag(TIF_PERFCTR)) {
 921                         err = -EINVAL;
 922                         break;
 923                 }
 924                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 925                 write_pcr(current_thread_info()->pcr_reg);
 926                 current_thread_info()->kernel_cntd0 =
 927                         current_thread_info()->kernel_cntd1 = 0;
 928                 reset_pic();
 929                 break;
 930         }
 931
 932         case PERFCTR_GETPCR: {
 933                 u64 __user *user_pcr = (u64 __user *)arg0;
 934
 935                 if (!test_thread_flag(TIF_PERFCTR)) {
 936                         err = -EINVAL;
 937                         break;
 938                 }
 939                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 940                 break;
 941         }
 942
 943         default:
 944                 err = -EINVAL;
 945                 break;
 946         };
 947         return err;
 948 }