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 asmlinkage unsigned long sys_getpagesize(void)
  37 {
  38         return PAGE_SIZE;
  39 }
  40
  41 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
  42 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
  43
  44 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  45  * overflow past the end of the 64-bit address space?
  46  */
  47 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  48 {
  49         unsigned long va_exclude_start, va_exclude_end;
  50
  51         va_exclude_start = VA_EXCLUDE_START;
  52         va_exclude_end   = VA_EXCLUDE_END;
  53
  54         if (unlikely(len >= va_exclude_start))
  55                 return 1;
  56
  57         if (unlikely((addr + len) < addr))
  58                 return 1;
  59
  60         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  61                      ((addr + len) >= va_exclude_start &&
  62                       (addr + len) < va_exclude_end)))
  63                 return 1;
  64
  65         return 0;
  66 }
  67
  68 /* Does start,end straddle the VA-space hole?  */
  69 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  70 {
  71         unsigned long va_exclude_start, va_exclude_end;
  72
  73         va_exclude_start = VA_EXCLUDE_START;
  74         va_exclude_end   = VA_EXCLUDE_END;
  75
  76         if (likely(start < va_exclude_start && end < va_exclude_start))
  77                 return 0;
  78
  79         if (likely(start >= va_exclude_end && end >= va_exclude_end))
  80                 return 0;
  81
  82         return 1;
  83 }
  84
  85 /* These functions differ from the default implementations in
  86  * mm/mmap.c in two ways:
  87  *
  88  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  89  *    for fixed such mappings we just validate what the user gave us.
  90  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  91  *    the spitfire/niagara VA-hole.
  92  */
  93
  94 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  95                                          unsigned long pgoff)
  96 {
  97         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  98         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  99
 100         return base + off;
 101 }
 102
 103 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 104                                               unsigned long pgoff)
 105 {
 106         unsigned long base = addr & ~(SHMLBA-1);
 107         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 108
 109         if (base + off <= addr)
 110                 return base + off;
 111         return base - off;
 112 }
 113
 114 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 115 {
 116         struct mm_struct *mm = current->mm;
 117         struct vm_area_struct * vma;
 118         unsigned long task_size = TASK_SIZE;
 119         unsigned long start_addr;
 120         int do_color_align;
 121
 122         if (flags & MAP_FIXED) {
 123                 /* We do not accept a shared mapping if it would violate
 124                  * cache aliasing constraints.
 125                  */
 126                 if ((flags & MAP_SHARED) &&
 127                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 128                         return -EINVAL;
 129                 return addr;
 130         }
 131
 132         if (test_thread_flag(TIF_32BIT))
 133                 task_size = 0xf0000000UL;
 134         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 135                 return -ENOMEM;
 136
 137         do_color_align = 0;
 138         if (filp || (flags & MAP_SHARED))
 139                 do_color_align = 1;
 140
 141         if (addr) {
 142                 if (do_color_align)
 143                         addr = COLOUR_ALIGN(addr, pgoff);
 144                 else
 145                         addr = PAGE_ALIGN(addr);
 146
 147                 vma = find_vma(mm, addr);
 148                 if (task_size - len >= addr &&
 149                     (!vma || addr + len <= vma->vm_start))
 150                         return addr;
 151         }
 152
 153         if (len > mm->cached_hole_size) {
 154                 start_addr = addr = mm->free_area_cache;
 155         } else {
 156                 start_addr = addr = TASK_UNMAPPED_BASE;
 157                 mm->cached_hole_size = 0;
 158         }
 159
 160         task_size -= len;
 161
 162 full_search:
 163         if (do_color_align)
 164                 addr = COLOUR_ALIGN(addr, pgoff);
 165         else
 166                 addr = PAGE_ALIGN(addr);
 167
 168         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 169                 /* At this point:  (!vma || addr < vma->vm_end). */
 170                 if (addr < VA_EXCLUDE_START &&
 171                     (addr + len) >= VA_EXCLUDE_START) {
 172                         addr = VA_EXCLUDE_END;
 173                         vma = find_vma(mm, VA_EXCLUDE_END);
 174                 }
 175                 if (unlikely(task_size < addr)) {
 176                         if (start_addr != TASK_UNMAPPED_BASE) {
 177                                 start_addr = addr = TASK_UNMAPPED_BASE;
 178                                 mm->cached_hole_size = 0;
 179                                 goto full_search;
 180                         }
 181                         return -ENOMEM;
 182                 }
 183                 if (likely(!vma || addr + len <= vma->vm_start)) {
 184                         /*
 185                          * Remember the place where we stopped the search:
 186                          */
 187                         mm->free_area_cache = addr + len;
 188                         return addr;
 189                 }
 190                 if (addr + mm->cached_hole_size < vma->vm_start)
 191                         mm->cached_hole_size = vma->vm_start - addr;
 192
 193                 addr = vma->vm_end;
 194                 if (do_color_align)
 195                         addr = COLOUR_ALIGN(addr, pgoff);
 196         }
 197 }
 198
 199 unsigned long
 200 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 201                           const unsigned long len, const unsigned long pgoff,
 202                           const unsigned long flags)
 203 {
 204         struct vm_area_struct *vma;
 205         struct mm_struct *mm = current->mm;
 206         unsigned long task_size = 0xf0000000UL;
 207         unsigned long addr = addr0;
 208         int do_color_align;
 209
 210         /* This should only ever run for 32-bit processes.  */
 211         BUG_ON(!test_thread_flag(TIF_32BIT));
 212
 213         if (flags & MAP_FIXED) {
 214                 /* We do not accept a shared mapping if it would violate
 215                  * cache aliasing constraints.
 216                  */
 217                 if ((flags & MAP_SHARED) &&
 218                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 219                         return -EINVAL;
 220                 return addr;
 221         }
 222
 223         if (unlikely(len > task_size))
 224                 return -ENOMEM;
 225
 226         do_color_align = 0;
 227         if (filp || (flags & MAP_SHARED))
 228                 do_color_align = 1;
 229
 230         /* requesting a specific address */
 231         if (addr) {
 232                 if (do_color_align)
 233                         addr = COLOUR_ALIGN(addr, pgoff);
 234                 else
 235                         addr = PAGE_ALIGN(addr);
 236
 237                 vma = find_vma(mm, addr);
 238                 if (task_size - len >= addr &&
 239                     (!vma || addr + len <= vma->vm_start))
 240                         return addr;
 241         }
 242
 243         /* check if free_area_cache is useful for us */
 244         if (len <= mm->cached_hole_size) {
 245                 mm->cached_hole_size = 0;
 246                 mm->free_area_cache = mm->mmap_base;
 247         }
 248
 249         /* either no address requested or can't fit in requested address hole */
 250         addr = mm->free_area_cache;
 251         if (do_color_align) {
 252                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 253
 254                 addr = base + len;
 255         }
 256
 257         /* make sure it can fit in the remaining address space */
 258         if (likely(addr > len)) {
 259                 vma = find_vma(mm, addr-len);
 260                 if (!vma || addr <= vma->vm_start) {
 261                         /* remember the address as a hint for next time */
 262                         return (mm->free_area_cache = addr-len);
 263                 }
 264         }
 265
 266         if (unlikely(mm->mmap_base < len))
 267                 goto bottomup;
 268
 269         addr = mm->mmap_base-len;
 270         if (do_color_align)
 271                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 272
 273         do {
 274                 /*
 275                  * Lookup failure means no vma is above this address,
 276                  * else if new region fits below vma->vm_start,
 277                  * return with success:
 278                  */
 279                 vma = find_vma(mm, addr);
 280                 if (likely(!vma || addr+len <= vma->vm_start)) {
 281                         /* remember the address as a hint for next time */
 282                         return (mm->free_area_cache = addr);
 283                 }
 284
 285                 /* remember the largest hole we saw so far */
 286                 if (addr + mm->cached_hole_size < vma->vm_start)
 287                         mm->cached_hole_size = vma->vm_start - addr;
 288
 289                 /* try just below the current vma->vm_start */
 290                 addr = vma->vm_start-len;
 291                 if (do_color_align)
 292                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 293         } while (likely(len < vma->vm_start));
 294
 295 bottomup:
 296         /*
 297          * A failed mmap() very likely causes application failure,
 298          * so fall back to the bottom-up function here. This scenario
 299          * can happen with large stack limits and large mmap()
 300          * allocations.
 301          */
 302         mm->cached_hole_size = ~0UL;
 303         mm->free_area_cache = TASK_UNMAPPED_BASE;
 304         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 305         /*
 306          * Restore the topdown base:
 307          */
 308         mm->free_area_cache = mm->mmap_base;
 309         mm->cached_hole_size = ~0UL;
 310
 311         return addr;
 312 }
 313
 314 /* Try to align mapping such that we align it as much as possible. */
 315 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 316 {
 317         unsigned long align_goal, addr = -ENOMEM;
 318
 319         if (flags & MAP_FIXED) {
 320                 /* Ok, don't mess with it. */
 321                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
 322         }
 323         flags &= ~MAP_SHARED;
 324
 325         align_goal = PAGE_SIZE;
 326         if (len >= (4UL * 1024 * 1024))
 327                 align_goal = (4UL * 1024 * 1024);
 328         else if (len >= (512UL * 1024))
 329                 align_goal = (512UL * 1024);
 330         else if (len >= (64UL * 1024))
 331                 align_goal = (64UL * 1024);
 332
 333         do {
 334                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 335                 if (!(addr & ~PAGE_MASK)) {
 336                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 337                         break;
 338                 }
 339
 340                 if (align_goal == (4UL * 1024 * 1024))
 341                         align_goal = (512UL * 1024);
 342                 else if (align_goal == (512UL * 1024))
 343                         align_goal = (64UL * 1024);
 344                 else
 345                         align_goal = PAGE_SIZE;
 346         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 347
 348         /* Mapping is smaller than 64K or larger areas could not
 349          * be obtained.
 350          */
 351         if (addr & ~PAGE_MASK)
 352                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 353
 354         return addr;
 355 }
 356
 357 /* Essentially the same as PowerPC... */
 358 void arch_pick_mmap_layout(struct mm_struct *mm)
 359 {
 360         /*
 361          * Fall back to the standard layout if the personality
 362          * bit is set, or if the expected stack growth is unlimited:
 363          */
 364         if (!test_thread_flag(TIF_32BIT) ||
 365             (current->personality & ADDR_COMPAT_LAYOUT) ||
 366             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 367             sysctl_legacy_va_layout) {
 368                 mm->mmap_base = TASK_UNMAPPED_BASE;
 369                 mm->get_unmapped_area = arch_get_unmapped_area;
 370                 mm->unmap_area = arch_unmap_area;
 371         } else {
 372                 /* We know it's 32-bit */
 373                 unsigned long task_size = 0xf0000000UL;
 374                 unsigned long gap;
 375
 376                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 377                 if (gap < 128 * 1024 * 1024)
 378                         gap = 128 * 1024 * 1024;
 379                 if (gap > (task_size / 6 * 5))
 380                         gap = (task_size / 6 * 5);
 381
 382                 mm->mmap_base = task_size - (gap & PAGE_MASK);
 383                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 384                 mm->unmap_area = arch_unmap_area_topdown;
 385         }
 386 }
 387
 388 asmlinkage unsigned long sparc_brk(unsigned long brk)
 389 {
 390         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 391         if (test_thread_flag(TIF_32BIT) && brk >= 0xf0000000UL)
 392                 return current->mm->brk;
 393
 394         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 395                 return current->mm->brk;
 396
 397         return sys_brk(brk);
 398 }
 399
 400 /*
 401  * sys_pipe() is the normal C calling standard for creating
 402  * a pipe. It's not the way unix traditionally does this, though.
 403  */
 404 asmlinkage long sparc_pipe(struct pt_regs *regs)
 405 {
 406         int fd[2];
 407         int error;
 408
 409         error = do_pipe(fd);
 410         if (error)
 411                 goto out;
 412         regs->u_regs[UREG_I1] = fd[1];
 413         error = fd[0];
 414 out:
 415         return error;
 416 }
 417
 418 /*
 419  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 420  *
 421  * This is really horribly ugly.
 422  */
 423
 424 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 425                         unsigned long third, void __user *ptr, long fifth)
 426 {
 427         int err;
 428
 429         /* No need for backward compatibility. We can start fresh... */
 430         if (call <= SEMCTL) {
 431                 switch (call) {
 432                 case SEMOP:
 433                         err = sys_semtimedop(first, ptr,
 434                                              (unsigned)second, NULL);
 435                         goto out;
 436                 case SEMTIMEDOP:
 437                         err = sys_semtimedop(first, ptr, (unsigned)second,
 438                                 (const struct timespec __user *) fifth);
 439                         goto out;
 440                 case SEMGET:
 441                         err = sys_semget(first, (int)second, (int)third);
 442                         goto out;
 443                 case SEMCTL: {
 444                         union semun fourth;
 445                         err = -EINVAL;
 446                         if (!ptr)
 447                                 goto out;
 448                         err = -EFAULT;
 449                         if (get_user(fourth.__pad,
 450                                      (void __user * __user *) ptr))
 451                                 goto out;
 452                         err = sys_semctl(first, (int)second | IPC_64,
 453                                          (int)third, fourth);
 454                         goto out;
 455                 }
 456                 default:
 457                         err = -ENOSYS;
 458                         goto out;
 459                 };
 460         }
 461         if (call <= MSGCTL) {
 462                 switch (call) {
 463                 case MSGSND:
 464                         err = sys_msgsnd(first, ptr, (size_t)second,
 465                                          (int)third);
 466                         goto out;
 467                 case MSGRCV:
 468                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 469                                          (int)third);
 470                         goto out;
 471                 case MSGGET:
 472                         err = sys_msgget((key_t)first, (int)second);
 473                         goto out;
 474                 case MSGCTL:
 475                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 476                         goto out;
 477                 default:
 478                         err = -ENOSYS;
 479                         goto out;
 480                 };
 481         }
 482         if (call <= SHMCTL) {
 483                 switch (call) {
 484                 case SHMAT: {
 485                         ulong raddr;
 486                         err = do_shmat(first, ptr, (int)second, &raddr);
 487                         if (!err) {
 488                                 if (put_user(raddr,
 489                                              (ulong __user *) third))
 490                                         err = -EFAULT;
 491                         }
 492                         goto out;
 493                 }
 494                 case SHMDT:
 495                         err = sys_shmdt(ptr);
 496                         goto out;
 497                 case SHMGET:
 498                         err = sys_shmget(first, (size_t)second, (int)third);
 499                         goto out;
 500                 case SHMCTL:
 501                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 502                         goto out;
 503                 default:
 504                         err = -ENOSYS;
 505                         goto out;
 506                 };
 507         } else {
 508                 err = -ENOSYS;
 509         }
 510 out:
 511         return err;
 512 }
 513
 514 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 515 {
 516         int ret = sys_newuname(name);
 517
 518         if (current->personality == PER_LINUX32 && !ret) {
 519                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 520                        ? -EFAULT : 0);
 521         }
 522         return ret;
 523 }
 524
 525 asmlinkage long sparc64_personality(unsigned long personality)
 526 {
 527         int ret;
 528
 529         if (current->personality == PER_LINUX32 &&
 530             personality == PER_LINUX)
 531                 personality = PER_LINUX32;
 532         ret = sys_personality(personality);
 533         if (ret == PER_LINUX32)
 534                 ret = PER_LINUX;
 535
 536         return ret;
 537 }
 538
 539 /* Linux version of mmap */
 540 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 541         unsigned long prot, unsigned long flags, unsigned long fd,
 542         unsigned long off)
 543 {
 544         struct file * file = NULL;
 545         unsigned long retval = -EBADF;
 546
 547         if (!(flags & MAP_ANONYMOUS)) {
 548                 file = fget(fd);
 549                 if (!file)
 550                         goto out;
 551         }
 552         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 553         len = PAGE_ALIGN(len);
 554         retval = -EINVAL;
 555
 556         if (test_thread_flag(TIF_32BIT)) {
 557                 if (len >= 0xf0000000UL)
 558                         goto out_putf;
 559
 560                 if ((flags & MAP_FIXED) && addr > 0xf0000000UL - len)
 561                         goto out_putf;
 562         } else {
 563                 if (len >= VA_EXCLUDE_START)
 564                         goto out_putf;
 565
 566                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 567                         goto out_putf;
 568         }
 569
 570         down_write(&current->mm->mmap_sem);
 571         retval = do_mmap(file, addr, len, prot, flags, off);
 572         up_write(&current->mm->mmap_sem);
 573
 574 out_putf:
 575         if (file)
 576                 fput(file);
 577 out:
 578         return retval;
 579 }
 580
 581 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 582 {
 583         long ret;
 584
 585         if (invalid_64bit_range(addr, len))
 586                 return -EINVAL;
 587
 588         down_write(&current->mm->mmap_sem);
 589         ret = do_munmap(current->mm, addr, len);
 590         up_write(&current->mm->mmap_sem);
 591         return ret;
 592 }
 593
 594 extern unsigned long do_mremap(unsigned long addr,
 595         unsigned long old_len, unsigned long new_len,
 596         unsigned long flags, unsigned long new_addr);
 597
 598 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 599         unsigned long old_len, unsigned long new_len,
 600         unsigned long flags, unsigned long new_addr)
 601 {
 602         struct vm_area_struct *vma;
 603         unsigned long ret = -EINVAL;
 604
 605         if (test_thread_flag(TIF_32BIT))
 606                 goto out;
 607         if (unlikely(new_len >= VA_EXCLUDE_START))
 608                 goto out;
 609         if (unlikely(invalid_64bit_range(addr, old_len)))
 610                 goto out;
 611
 612         down_write(&current->mm->mmap_sem);
 613         if (flags & MREMAP_FIXED) {
 614                 if (invalid_64bit_range(new_addr, new_len))
 615                         goto out_sem;
 616         } else if (invalid_64bit_range(addr, new_len)) {
 617                 unsigned long map_flags = 0;
 618                 struct file *file = NULL;
 619
 620                 ret = -ENOMEM;
 621                 if (!(flags & MREMAP_MAYMOVE))
 622                         goto out_sem;
 623
 624                 vma = find_vma(current->mm, addr);
 625                 if (vma) {
 626                         if (vma->vm_flags & VM_SHARED)
 627                                 map_flags |= MAP_SHARED;
 628                         file = vma->vm_file;
 629                 }
 630
 631                 /* MREMAP_FIXED checked above. */
 632                 new_addr = get_unmapped_area(file, addr, new_len,
 633                                     vma ? vma->vm_pgoff : 0,
 634                                     map_flags);
 635                 ret = new_addr;
 636                 if (new_addr & ~PAGE_MASK)
 637                         goto out_sem;
 638                 flags |= MREMAP_FIXED;
 639         }
 640         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 641 out_sem:
 642         up_write(&current->mm->mmap_sem);
 643 out:
 644         return ret;
 645 }
 646
 647 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 648 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 649 {
 650         static int count;
 651
 652         /* Don't make the system unusable, if someone goes stuck */
 653         if (count++ > 5)
 654                 return -ENOSYS;
 655
 656         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 657 #ifdef DEBUG_UNIMP_SYSCALL
 658         show_regs (regs);
 659 #endif
 660
 661         return -ENOSYS;
 662 }
 663
 664 /* #define DEBUG_SPARC_BREAKPOINT */
 665
 666 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 667 {
 668         siginfo_t info;
 669
 670         if (test_thread_flag(TIF_32BIT)) {
 671                 regs->tpc &= 0xffffffff;
 672                 regs->tnpc &= 0xffffffff;
 673         }
 674 #ifdef DEBUG_SPARC_BREAKPOINT
 675         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 676 #endif
 677         info.si_signo = SIGTRAP;
 678         info.si_errno = 0;
 679         info.si_code = TRAP_BRKPT;
 680         info.si_addr = (void __user *)regs->tpc;
 681         info.si_trapno = 0;
 682         force_sig_info(SIGTRAP, &info, current);
 683 #ifdef DEBUG_SPARC_BREAKPOINT
 684         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 685 #endif
 686 }
 687
 688 extern void check_pending(int signum);
 689
 690 asmlinkage long sys_getdomainname(char __user *name, int len)
 691 {
 692         int nlen;
 693         int err = -EFAULT;
 694
 695         down_read(&uts_sem);
 696
 697         nlen = strlen(system_utsname.domainname) + 1;
 698
 699         if (nlen < len)
 700                 len = nlen;
 701         if (len > __NEW_UTS_LEN)
 702                 goto done;
 703         if (copy_to_user(name, system_utsname.domainname, len))
 704                 goto done;
 705         err = 0;
 706 done:
 707         up_read(&uts_sem);
 708         return err;
 709 }
 710
 711 asmlinkage long solaris_syscall(struct pt_regs *regs)
 712 {
 713         static int count;
 714
 715         regs->tpc = regs->tnpc;
 716         regs->tnpc += 4;
 717         if (test_thread_flag(TIF_32BIT)) {
 718                 regs->tpc &= 0xffffffff;
 719                 regs->tnpc &= 0xffffffff;
 720         }
 721         if (++count <= 5) {
 722                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 723                 show_regs (regs);
 724         }
 725         send_sig(SIGSEGV, current, 1);
 726
 727         return -ENOSYS;
 728 }
 729
 730 #ifndef CONFIG_SUNOS_EMUL
 731 asmlinkage long sunos_syscall(struct pt_regs *regs)
 732 {
 733         static int count;
 734
 735         regs->tpc = regs->tnpc;
 736         regs->tnpc += 4;
 737         if (test_thread_flag(TIF_32BIT)) {
 738                 regs->tpc &= 0xffffffff;
 739                 regs->tnpc &= 0xffffffff;
 740         }
 741         if (++count <= 20)
 742                 printk ("SunOS binary emulation not compiled in\n");
 743         force_sig(SIGSEGV, current);
 744
 745         return -ENOSYS;
 746 }
 747 #endif
 748
 749 asmlinkage long sys_utrap_install(utrap_entry_t type,
 750                                   utrap_handler_t new_p,
 751                                   utrap_handler_t new_d,
 752                                   utrap_handler_t __user *old_p,
 753                                   utrap_handler_t __user *old_d)
 754 {
 755         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 756                 return -EINVAL;
 757         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 758                 if (old_p) {
 759                         if (!current_thread_info()->utraps) {
 760                                 if (put_user(NULL, old_p))
 761                                         return -EFAULT;
 762                         } else {
 763                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 764                                         return -EFAULT;
 765                         }
 766                 }
 767                 if (old_d) {
 768                         if (put_user(NULL, old_d))
 769                                 return -EFAULT;
 770                 }
 771                 return 0;
 772         }
 773         if (!current_thread_info()->utraps) {
 774                 current_thread_info()->utraps =
 775                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 776                 if (!current_thread_info()->utraps)
 777                         return -ENOMEM;
 778                 current_thread_info()->utraps[0] = 1;
 779         } else {
 780                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 781                     current_thread_info()->utraps[0] > 1) {
 782                         long *p = current_thread_info()->utraps;
 783
 784                         current_thread_info()->utraps =
 785                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 786                                         GFP_KERNEL);
 787                         if (!current_thread_info()->utraps) {
 788                                 current_thread_info()->utraps = p;
 789                                 return -ENOMEM;
 790                         }
 791                         p[0]--;
 792                         current_thread_info()->utraps[0] = 1;
 793                         memcpy(current_thread_info()->utraps+1, p+1,
 794                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 795                 }
 796         }
 797         if (old_p) {
 798                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 799                         return -EFAULT;
 800         }
 801         if (old_d) {
 802                 if (put_user(NULL, old_d))
 803                         return -EFAULT;
 804         }
 805         current_thread_info()->utraps[type] = (long)new_p;
 806
 807         return 0;
 808 }
 809
 810 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 811 {
 812         if (model >= 3)
 813                 return -EINVAL;
 814         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 815         return 0;
 816 }
 817
 818 asmlinkage long sys_rt_sigaction(int sig,
 819                                  const struct sigaction __user *act,
 820                                  struct sigaction __user *oact,
 821                                  void __user *restorer,
 822                                  size_t sigsetsize)
 823 {
 824         struct k_sigaction new_ka, old_ka;
 825         int ret;
 826
 827         /* XXX: Don't preclude handling different sized sigset_t's.  */
 828         if (sigsetsize != sizeof(sigset_t))
 829                 return -EINVAL;
 830
 831         if (act) {
 832                 new_ka.ka_restorer = restorer;
 833                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 834                         return -EFAULT;
 835         }
 836
 837         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 838
 839         if (!ret && oact) {
 840                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 841                         return -EFAULT;
 842         }
 843
 844         return ret;
 845 }
 846
 847 /* Invoked by rtrap code to update performance counters in
 848  * user space.
 849  */
 850 asmlinkage void update_perfctrs(void)
 851 {
 852         unsigned long pic, tmp;
 853
 854         read_pic(pic);
 855         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 856         __put_user(tmp, current_thread_info()->user_cntd0);
 857         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 858         __put_user(tmp, current_thread_info()->user_cntd1);
 859         reset_pic();
 860 }
 861
 862 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 863 {
 864         int err = 0;
 865
 866         switch(opcode) {
 867         case PERFCTR_ON:
 868                 current_thread_info()->pcr_reg = arg2;
 869                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 870                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 871                 current_thread_info()->kernel_cntd0 =
 872                         current_thread_info()->kernel_cntd1 = 0;
 873                 write_pcr(arg2);
 874                 reset_pic();
 875                 set_thread_flag(TIF_PERFCTR);
 876                 break;
 877
 878         case PERFCTR_OFF:
 879                 err = -EINVAL;
 880                 if (test_thread_flag(TIF_PERFCTR)) {
 881                         current_thread_info()->user_cntd0 =
 882                                 current_thread_info()->user_cntd1 = NULL;
 883                         current_thread_info()->pcr_reg = 0;
 884                         write_pcr(0);
 885                         clear_thread_flag(TIF_PERFCTR);
 886                         err = 0;
 887                 }
 888                 break;
 889
 890         case PERFCTR_READ: {
 891                 unsigned long pic, tmp;
 892
 893                 if (!test_thread_flag(TIF_PERFCTR)) {
 894                         err = -EINVAL;
 895                         break;
 896                 }
 897                 read_pic(pic);
 898                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 899                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 900                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 901                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 902                 reset_pic();
 903                 break;
 904         }
 905
 906         case PERFCTR_CLRPIC:
 907                 if (!test_thread_flag(TIF_PERFCTR)) {
 908                         err = -EINVAL;
 909                         break;
 910                 }
 911                 current_thread_info()->kernel_cntd0 =
 912                         current_thread_info()->kernel_cntd1 = 0;
 913                 reset_pic();
 914                 break;
 915
 916         case PERFCTR_SETPCR: {
 917                 u64 __user *user_pcr = (u64 __user *)arg0;
 918
 919                 if (!test_thread_flag(TIF_PERFCTR)) {
 920                         err = -EINVAL;
 921                         break;
 922                 }
 923                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 924                 write_pcr(current_thread_info()->pcr_reg);
 925                 current_thread_info()->kernel_cntd0 =
 926                         current_thread_info()->kernel_cntd1 = 0;
 927                 reset_pic();
 928                 break;
 929         }
 930
 931         case PERFCTR_GETPCR: {
 932                 u64 __user *user_pcr = (u64 __user *)arg0;
 933
 934                 if (!test_thread_flag(TIF_PERFCTR)) {
 935                         err = -EINVAL;
 936                         break;
 937                 }
 938                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 939                 break;
 940         }
 941
 942         default:
 943                 err = -EINVAL;
 944                 break;
 945         };
 946         return err;
 947 }