arch/sparc64/kernel/sys_sparc.c

   1 /* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $
   2  * linux/arch/sparc64/kernel/sys_sparc.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/sparc
   6  * platform.
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/sched.h>
  13 #include <linux/fs.h>
  14 #include <linux/file.h>
  15 #include <linux/mm.h>
  16 #include <linux/sem.h>
  17 #include <linux/msg.h>
  18 #include <linux/shm.h>
  19 #include <linux/stat.h>
  20 #include <linux/mman.h>
  21 #include <linux/utsname.h>
  22 #include <linux/smp.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/slab.h>
  25 #include <linux/syscalls.h>
  26 #include <linux/ipc.h>
  27 #include <linux/personality.h>
  28 #include <linux/random.h>
  29 #include <linux/vs_cvirt.h>
  30
  31 #include <asm/uaccess.h>
  32 #include <asm/ipc.h>
  33 #include <asm/utrap.h>
  34 #include <asm/perfctr.h>
  35 #include <asm/a.out.h>
  36
  37 /* #define DEBUG_UNIMP_SYSCALL */
  38
  39 asmlinkage unsigned long sys_getpagesize(void)
  40 {
  41         return PAGE_SIZE;
  42 }
  43
  44 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
  45 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
  46
  47 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  48  * overflow past the end of the 64-bit address space?
  49  */
  50 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  51 {
  52         unsigned long va_exclude_start, va_exclude_end;
  53
  54         va_exclude_start = VA_EXCLUDE_START;
  55         va_exclude_end   = VA_EXCLUDE_END;
  56
  57         if (unlikely(len >= va_exclude_start))
  58                 return 1;
  59
  60         if (unlikely((addr + len) < addr))
  61                 return 1;
  62
  63         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  64                      ((addr + len) >= va_exclude_start &&
  65                       (addr + len) < va_exclude_end)))
  66                 return 1;
  67
  68         return 0;
  69 }
  70
  71 /* Does start,end straddle the VA-space hole?  */
  72 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  73 {
  74         unsigned long va_exclude_start, va_exclude_end;
  75
  76         va_exclude_start = VA_EXCLUDE_START;
  77         va_exclude_end   = VA_EXCLUDE_END;
  78
  79         if (likely(start < va_exclude_start && end < va_exclude_start))
  80                 return 0;
  81
  82         if (likely(start >= va_exclude_end && end >= va_exclude_end))
  83                 return 0;
  84
  85         return 1;
  86 }
  87
  88 /* These functions differ from the default implementations in
  89  * mm/mmap.c in two ways:
  90  *
  91  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  92  *    for fixed such mappings we just validate what the user gave us.
  93  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  94  *    the spitfire/niagara VA-hole.
  95  */
  96
  97 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  98                                          unsigned long pgoff)
  99 {
 100         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
 101         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 102
 103         return base + off;
 104 }
 105
 106 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 107                                               unsigned long pgoff)
 108 {
 109         unsigned long base = addr & ~(SHMLBA-1);
 110         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 111
 112         if (base + off <= addr)
 113                 return base + off;
 114         return base - off;
 115 }
 116
 117 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 118 {
 119         struct mm_struct *mm = current->mm;
 120         struct vm_area_struct * vma;
 121         unsigned long task_size = TASK_SIZE;
 122         unsigned long start_addr;
 123         int do_color_align;
 124
 125         if (flags & MAP_FIXED) {
 126                 /* We do not accept a shared mapping if it would violate
 127                  * cache aliasing constraints.
 128                  */
 129                 if ((flags & MAP_SHARED) &&
 130                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 131                         return -EINVAL;
 132                 return addr;
 133         }
 134
 135         if (test_thread_flag(TIF_32BIT))
 136                 task_size = STACK_TOP32;
 137         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 138                 return -ENOMEM;
 139
 140         do_color_align = 0;
 141         if (filp || (flags & MAP_SHARED))
 142                 do_color_align = 1;
 143
 144         if (addr) {
 145                 if (do_color_align)
 146                         addr = COLOUR_ALIGN(addr, pgoff);
 147                 else
 148                         addr = PAGE_ALIGN(addr);
 149
 150                 vma = find_vma(mm, addr);
 151                 if (task_size - len >= addr &&
 152                     (!vma || addr + len <= vma->vm_start))
 153                         return addr;
 154         }
 155
 156         if (len > mm->cached_hole_size) {
 157                 start_addr = addr = mm->free_area_cache;
 158         } else {
 159                 start_addr = addr = TASK_UNMAPPED_BASE;
 160                 mm->cached_hole_size = 0;
 161         }
 162
 163         task_size -= len;
 164
 165 full_search:
 166         if (do_color_align)
 167                 addr = COLOUR_ALIGN(addr, pgoff);
 168         else
 169                 addr = PAGE_ALIGN(addr);
 170
 171         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 172                 /* At this point:  (!vma || addr < vma->vm_end). */
 173                 if (addr < VA_EXCLUDE_START &&
 174                     (addr + len) >= VA_EXCLUDE_START) {
 175                         addr = VA_EXCLUDE_END;
 176                         vma = find_vma(mm, VA_EXCLUDE_END);
 177                 }
 178                 if (unlikely(task_size < addr)) {
 179                         if (start_addr != TASK_UNMAPPED_BASE) {
 180                                 start_addr = addr = TASK_UNMAPPED_BASE;
 181                                 mm->cached_hole_size = 0;
 182                                 goto full_search;
 183                         }
 184                         return -ENOMEM;
 185                 }
 186                 if (likely(!vma || addr + len <= vma->vm_start)) {
 187                         /*
 188                          * Remember the place where we stopped the search:
 189                          */
 190                         mm->free_area_cache = addr + len;
 191                         return addr;
 192                 }
 193                 if (addr + mm->cached_hole_size < vma->vm_start)
 194                         mm->cached_hole_size = vma->vm_start - addr;
 195
 196                 addr = vma->vm_end;
 197                 if (do_color_align)
 198                         addr = COLOUR_ALIGN(addr, pgoff);
 199         }
 200 }
 201
 202 unsigned long
 203 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 204                           const unsigned long len, const unsigned long pgoff,
 205                           const unsigned long flags)
 206 {
 207         struct vm_area_struct *vma;
 208         struct mm_struct *mm = current->mm;
 209         unsigned long task_size = STACK_TOP32;
 210         unsigned long addr = addr0;
 211         int do_color_align;
 212
 213         /* This should only ever run for 32-bit processes.  */
 214         BUG_ON(!test_thread_flag(TIF_32BIT));
 215
 216         if (flags & MAP_FIXED) {
 217                 /* We do not accept a shared mapping if it would violate
 218                  * cache aliasing constraints.
 219                  */
 220                 if ((flags & MAP_SHARED) &&
 221                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 222                         return -EINVAL;
 223                 return addr;
 224         }
 225
 226         if (unlikely(len > task_size))
 227                 return -ENOMEM;
 228
 229         do_color_align = 0;
 230         if (filp || (flags & MAP_SHARED))
 231                 do_color_align = 1;
 232
 233         /* requesting a specific address */
 234         if (addr) {
 235                 if (do_color_align)
 236                         addr = COLOUR_ALIGN(addr, pgoff);
 237                 else
 238                         addr = PAGE_ALIGN(addr);
 239
 240                 vma = find_vma(mm, addr);
 241                 if (task_size - len >= addr &&
 242                     (!vma || addr + len <= vma->vm_start))
 243                         return addr;
 244         }
 245
 246         /* check if free_area_cache is useful for us */
 247         if (len <= mm->cached_hole_size) {
 248                 mm->cached_hole_size = 0;
 249                 mm->free_area_cache = mm->mmap_base;
 250         }
 251
 252         /* either no address requested or can't fit in requested address hole */
 253         addr = mm->free_area_cache;
 254         if (do_color_align) {
 255                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 256
 257                 addr = base + len;
 258         }
 259
 260         /* make sure it can fit in the remaining address space */
 261         if (likely(addr > len)) {
 262                 vma = find_vma(mm, addr-len);
 263                 if (!vma || addr <= vma->vm_start) {
 264                         /* remember the address as a hint for next time */
 265                         return (mm->free_area_cache = addr-len);
 266                 }
 267         }
 268
 269         if (unlikely(mm->mmap_base < len))
 270                 goto bottomup;
 271
 272         addr = mm->mmap_base-len;
 273         if (do_color_align)
 274                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 275
 276         do {
 277                 /*
 278                  * Lookup failure means no vma is above this address,
 279                  * else if new region fits below vma->vm_start,
 280                  * return with success:
 281                  */
 282                 vma = find_vma(mm, addr);
 283                 if (likely(!vma || addr+len <= vma->vm_start)) {
 284                         /* remember the address as a hint for next time */
 285                         return (mm->free_area_cache = addr);
 286                 }
 287
 288                 /* remember the largest hole we saw so far */
 289                 if (addr + mm->cached_hole_size < vma->vm_start)
 290                         mm->cached_hole_size = vma->vm_start - addr;
 291
 292                 /* try just below the current vma->vm_start */
 293                 addr = vma->vm_start-len;
 294                 if (do_color_align)
 295                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 296         } while (likely(len < vma->vm_start));
 297
 298 bottomup:
 299         /*
 300          * A failed mmap() very likely causes application failure,
 301          * so fall back to the bottom-up function here. This scenario
 302          * can happen with large stack limits and large mmap()
 303          * allocations.
 304          */
 305         mm->cached_hole_size = ~0UL;
 306         mm->free_area_cache = TASK_UNMAPPED_BASE;
 307         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 308         /*
 309          * Restore the topdown base:
 310          */
 311         mm->free_area_cache = mm->mmap_base;
 312         mm->cached_hole_size = ~0UL;
 313
 314         return addr;
 315 }
 316
 317 /* Try to align mapping such that we align it as much as possible. */
 318 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 319 {
 320         unsigned long align_goal, addr = -ENOMEM;
 321
 322         if (flags & MAP_FIXED) {
 323                 /* Ok, don't mess with it. */
 324                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
 325         }
 326         flags &= ~MAP_SHARED;
 327
 328         align_goal = PAGE_SIZE;
 329         if (len >= (4UL * 1024 * 1024))
 330                 align_goal = (4UL * 1024 * 1024);
 331         else if (len >= (512UL * 1024))
 332                 align_goal = (512UL * 1024);
 333         else if (len >= (64UL * 1024))
 334                 align_goal = (64UL * 1024);
 335
 336         do {
 337                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 338                 if (!(addr & ~PAGE_MASK)) {
 339                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 340                         break;
 341                 }
 342
 343                 if (align_goal == (4UL * 1024 * 1024))
 344                         align_goal = (512UL * 1024);
 345                 else if (align_goal == (512UL * 1024))
 346                         align_goal = (64UL * 1024);
 347                 else
 348                         align_goal = PAGE_SIZE;
 349         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 350
 351         /* Mapping is smaller than 64K or larger areas could not
 352          * be obtained.
 353          */
 354         if (addr & ~PAGE_MASK)
 355                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 356
 357         return addr;
 358 }
 359
 360 /* Essentially the same as PowerPC... */
 361 void arch_pick_mmap_layout(struct mm_struct *mm)
 362 {
 363         unsigned long random_factor = 0UL;
 364
 365         if (current->flags & PF_RANDOMIZE) {
 366                 random_factor = get_random_int();
 367                 if (test_thread_flag(TIF_32BIT))
 368                         random_factor &= ((1 * 1024 * 1024) - 1);
 369                 else
 370                         random_factor = ((random_factor << PAGE_SHIFT) &
 371                                          0xffffffffUL);
 372         }
 373
 374         /*
 375          * Fall back to the standard layout if the personality
 376          * bit is set, or if the expected stack growth is unlimited:
 377          */
 378         if (!test_thread_flag(TIF_32BIT) ||
 379             (current->personality & ADDR_COMPAT_LAYOUT) ||
 380             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 381             sysctl_legacy_va_layout) {
 382                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 383                 mm->get_unmapped_area = arch_get_unmapped_area;
 384                 mm->unmap_area = arch_unmap_area;
 385         } else {
 386                 /* We know it's 32-bit */
 387                 unsigned long task_size = STACK_TOP32;
 388                 unsigned long gap;
 389
 390                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 391                 if (gap < 128 * 1024 * 1024)
 392                         gap = 128 * 1024 * 1024;
 393                 if (gap > (task_size / 6 * 5))
 394                         gap = (task_size / 6 * 5);
 395
 396                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 397                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 398                 mm->unmap_area = arch_unmap_area_topdown;
 399         }
 400 }
 401
 402 asmlinkage unsigned long sparc_brk(unsigned long brk)
 403 {
 404         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 405         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 406                 return current->mm->brk;
 407
 408         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 409                 return current->mm->brk;
 410
 411         return sys_brk(brk);
 412 }
 413
 414 /*
 415  * sys_pipe() is the normal C calling standard for creating
 416  * a pipe. It's not the way unix traditionally does this, though.
 417  */
 418 asmlinkage long sparc_pipe(struct pt_regs *regs)
 419 {
 420         int fd[2];
 421         int error;
 422
 423         error = do_pipe(fd);
 424         if (error)
 425                 goto out;
 426         regs->u_regs[UREG_I1] = fd[1];
 427         error = fd[0];
 428 out:
 429         return error;
 430 }
 431
 432 /*
 433  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 434  *
 435  * This is really horribly ugly.
 436  */
 437
 438 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 439                         unsigned long third, void __user *ptr, long fifth)
 440 {
 441         int err;
 442
 443         /* No need for backward compatibility. We can start fresh... */
 444         if (call <= SEMCTL) {
 445                 switch (call) {
 446                 case SEMOP:
 447                         err = sys_semtimedop(first, ptr,
 448                                              (unsigned)second, NULL);
 449                         goto out;
 450                 case SEMTIMEDOP:
 451                         err = sys_semtimedop(first, ptr, (unsigned)second,
 452                                 (const struct timespec __user *) fifth);
 453                         goto out;
 454                 case SEMGET:
 455                         err = sys_semget(first, (int)second, (int)third);
 456                         goto out;
 457                 case SEMCTL: {
 458                         union semun fourth;
 459                         err = -EINVAL;
 460                         if (!ptr)
 461                                 goto out;
 462                         err = -EFAULT;
 463                         if (get_user(fourth.__pad,
 464                                      (void __user * __user *) ptr))
 465                                 goto out;
 466                         err = sys_semctl(first, (int)second | IPC_64,
 467                                          (int)third, fourth);
 468                         goto out;
 469                 }
 470                 default:
 471                         err = -ENOSYS;
 472                         goto out;
 473                 };
 474         }
 475         if (call <= MSGCTL) {
 476                 switch (call) {
 477                 case MSGSND:
 478                         err = sys_msgsnd(first, ptr, (size_t)second,
 479                                          (int)third);
 480                         goto out;
 481                 case MSGRCV:
 482                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 483                                          (int)third);
 484                         goto out;
 485                 case MSGGET:
 486                         err = sys_msgget((key_t)first, (int)second);
 487                         goto out;
 488                 case MSGCTL:
 489                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 490                         goto out;
 491                 default:
 492                         err = -ENOSYS;
 493                         goto out;
 494                 };
 495         }
 496         if (call <= SHMCTL) {
 497                 switch (call) {
 498                 case SHMAT: {
 499                         ulong raddr;
 500                         err = do_shmat(first, ptr, (int)second, &raddr);
 501                         if (!err) {
 502                                 if (put_user(raddr,
 503                                              (ulong __user *) third))
 504                                         err = -EFAULT;
 505                         }
 506                         goto out;
 507                 }
 508                 case SHMDT:
 509                         err = sys_shmdt(ptr);
 510                         goto out;
 511                 case SHMGET:
 512                         err = sys_shmget(first, (size_t)second, (int)third);
 513                         goto out;
 514                 case SHMCTL:
 515                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 516                         goto out;
 517                 default:
 518                         err = -ENOSYS;
 519                         goto out;
 520                 };
 521         } else {
 522                 err = -ENOSYS;
 523         }
 524 out:
 525         return err;
 526 }
 527
 528 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 529 {
 530         int ret = sys_newuname(name);
 531
 532         if (current->personality == PER_LINUX32 && !ret) {
 533                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 534                        ? -EFAULT : 0);
 535         }
 536         return ret;
 537 }
 538
 539 asmlinkage long sparc64_personality(unsigned long personality)
 540 {
 541         int ret;
 542
 543         if (current->personality == PER_LINUX32 &&
 544             personality == PER_LINUX)
 545                 personality = PER_LINUX32;
 546         ret = sys_personality(personality);
 547         if (ret == PER_LINUX32)
 548                 ret = PER_LINUX;
 549
 550         return ret;
 551 }
 552
 553 /* Linux version of mmap */
 554 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 555         unsigned long prot, unsigned long flags, unsigned long fd,
 556         unsigned long off)
 557 {
 558         struct file * file = NULL;
 559         unsigned long retval = -EBADF;
 560
 561         if (!(flags & MAP_ANONYMOUS)) {
 562                 file = fget(fd);
 563                 if (!file)
 564                         goto out;
 565         }
 566         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 567         len = PAGE_ALIGN(len);
 568         retval = -EINVAL;
 569
 570         if (test_thread_flag(TIF_32BIT)) {
 571                 if (len >= STACK_TOP32)
 572                         goto out_putf;
 573
 574                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 575                         goto out_putf;
 576         } else {
 577                 if (len >= VA_EXCLUDE_START)
 578                         goto out_putf;
 579
 580                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 581                         goto out_putf;
 582         }
 583
 584         down_write(&current->mm->mmap_sem);
 585         retval = do_mmap(file, addr, len, prot, flags, off);
 586         up_write(&current->mm->mmap_sem);
 587
 588 out_putf:
 589         if (file)
 590                 fput(file);
 591 out:
 592         return retval;
 593 }
 594
 595 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 596 {
 597         long ret;
 598
 599         if (invalid_64bit_range(addr, len))
 600                 return -EINVAL;
 601
 602         down_write(&current->mm->mmap_sem);
 603         ret = do_munmap(current->mm, addr, len);
 604         up_write(&current->mm->mmap_sem);
 605         return ret;
 606 }
 607
 608 extern unsigned long do_mremap(unsigned long addr,
 609         unsigned long old_len, unsigned long new_len,
 610         unsigned long flags, unsigned long new_addr);
 611
 612 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 613         unsigned long old_len, unsigned long new_len,
 614         unsigned long flags, unsigned long new_addr)
 615 {
 616         struct vm_area_struct *vma;
 617         unsigned long ret = -EINVAL;
 618
 619         if (test_thread_flag(TIF_32BIT))
 620                 goto out;
 621         if (unlikely(new_len >= VA_EXCLUDE_START))
 622                 goto out;
 623         if (unlikely(invalid_64bit_range(addr, old_len)))
 624                 goto out;
 625
 626         down_write(&current->mm->mmap_sem);
 627         if (flags & MREMAP_FIXED) {
 628                 if (invalid_64bit_range(new_addr, new_len))
 629                         goto out_sem;
 630         } else if (invalid_64bit_range(addr, new_len)) {
 631                 unsigned long map_flags = 0;
 632                 struct file *file = NULL;
 633
 634                 ret = -ENOMEM;
 635                 if (!(flags & MREMAP_MAYMOVE))
 636                         goto out_sem;
 637
 638                 vma = find_vma(current->mm, addr);
 639                 if (vma) {
 640                         if (vma->vm_flags & VM_SHARED)
 641                                 map_flags |= MAP_SHARED;
 642                         file = vma->vm_file;
 643                 }
 644
 645                 /* MREMAP_FIXED checked above. */
 646                 new_addr = get_unmapped_area(file, addr, new_len,
 647                                     vma ? vma->vm_pgoff : 0,
 648                                     map_flags);
 649                 ret = new_addr;
 650                 if (new_addr & ~PAGE_MASK)
 651                         goto out_sem;
 652                 flags |= MREMAP_FIXED;
 653         }
 654         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 655 out_sem:
 656         up_write(&current->mm->mmap_sem);
 657 out:
 658         return ret;
 659 }
 660
 661 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 662 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 663 {
 664         static int count;
 665
 666         /* Don't make the system unusable, if someone goes stuck */
 667         if (count++ > 5)
 668                 return -ENOSYS;
 669
 670         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 671 #ifdef DEBUG_UNIMP_SYSCALL
 672         show_regs (regs);
 673 #endif
 674
 675         return -ENOSYS;
 676 }
 677
 678 /* #define DEBUG_SPARC_BREAKPOINT */
 679
 680 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 681 {
 682         siginfo_t info;
 683
 684         if (test_thread_flag(TIF_32BIT)) {
 685                 regs->tpc &= 0xffffffff;
 686                 regs->tnpc &= 0xffffffff;
 687         }
 688 #ifdef DEBUG_SPARC_BREAKPOINT
 689         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 690 #endif
 691         info.si_signo = SIGTRAP;
 692         info.si_errno = 0;
 693         info.si_code = TRAP_BRKPT;
 694         info.si_addr = (void __user *)regs->tpc;
 695         info.si_trapno = 0;
 696         force_sig_info(SIGTRAP, &info, current);
 697 #ifdef DEBUG_SPARC_BREAKPOINT
 698         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 699 #endif
 700 }
 701
 702 extern void check_pending(int signum);
 703
 704 asmlinkage long sys_getdomainname(char __user *name, int len)
 705 {
 706         int nlen;
 707         int err = -EFAULT;
 708
 709         down_read(&uts_sem);
 710
 711         nlen = strlen(vx_new_uts(domainname)) + 1;
 712
 713         if (nlen < len)
 714                 len = nlen;
 715         if (len > __NEW_UTS_LEN)
 716                 goto done;
 717         if (copy_to_user(name, vx_new_uts(domainname), len))
 718                 goto done;
 719         err = 0;
 720 done:
 721         up_read(&uts_sem);
 722         return err;
 723 }
 724
 725 asmlinkage long solaris_syscall(struct pt_regs *regs)
 726 {
 727         static int count;
 728
 729         regs->tpc = regs->tnpc;
 730         regs->tnpc += 4;
 731         if (test_thread_flag(TIF_32BIT)) {
 732                 regs->tpc &= 0xffffffff;
 733                 regs->tnpc &= 0xffffffff;
 734         }
 735         if (++count <= 5) {
 736                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 737                 show_regs (regs);
 738         }
 739         send_sig(SIGSEGV, current, 1);
 740
 741         return -ENOSYS;
 742 }
 743
 744 #ifndef CONFIG_SUNOS_EMUL
 745 asmlinkage long sunos_syscall(struct pt_regs *regs)
 746 {
 747         static int count;
 748
 749         regs->tpc = regs->tnpc;
 750         regs->tnpc += 4;
 751         if (test_thread_flag(TIF_32BIT)) {
 752                 regs->tpc &= 0xffffffff;
 753                 regs->tnpc &= 0xffffffff;
 754         }
 755         if (++count <= 20)
 756                 printk ("SunOS binary emulation not compiled in\n");
 757         force_sig(SIGSEGV, current);
 758
 759         return -ENOSYS;
 760 }
 761 #endif
 762
 763 asmlinkage long sys_utrap_install(utrap_entry_t type,
 764                                   utrap_handler_t new_p,
 765                                   utrap_handler_t new_d,
 766                                   utrap_handler_t __user *old_p,
 767                                   utrap_handler_t __user *old_d)
 768 {
 769         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 770                 return -EINVAL;
 771         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 772                 if (old_p) {
 773                         if (!current_thread_info()->utraps) {
 774                                 if (put_user(NULL, old_p))
 775                                         return -EFAULT;
 776                         } else {
 777                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 778                                         return -EFAULT;
 779                         }
 780                 }
 781                 if (old_d) {
 782                         if (put_user(NULL, old_d))
 783                                 return -EFAULT;
 784                 }
 785                 return 0;
 786         }
 787         if (!current_thread_info()->utraps) {
 788                 current_thread_info()->utraps =
 789                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 790                 if (!current_thread_info()->utraps)
 791                         return -ENOMEM;
 792                 current_thread_info()->utraps[0] = 1;
 793         } else {
 794                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 795                     current_thread_info()->utraps[0] > 1) {
 796                         long *p = current_thread_info()->utraps;
 797
 798                         current_thread_info()->utraps =
 799                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 800                                         GFP_KERNEL);
 801                         if (!current_thread_info()->utraps) {
 802                                 current_thread_info()->utraps = p;
 803                                 return -ENOMEM;
 804                         }
 805                         p[0]--;
 806                         current_thread_info()->utraps[0] = 1;
 807                         memcpy(current_thread_info()->utraps+1, p+1,
 808                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 809                 }
 810         }
 811         if (old_p) {
 812                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 813                         return -EFAULT;
 814         }
 815         if (old_d) {
 816                 if (put_user(NULL, old_d))
 817                         return -EFAULT;
 818         }
 819         current_thread_info()->utraps[type] = (long)new_p;
 820
 821         return 0;
 822 }
 823
 824 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 825 {
 826         if (model >= 3)
 827                 return -EINVAL;
 828         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 829         return 0;
 830 }
 831
 832 asmlinkage long sys_rt_sigaction(int sig,
 833                                  const struct sigaction __user *act,
 834                                  struct sigaction __user *oact,
 835                                  void __user *restorer,
 836                                  size_t sigsetsize)
 837 {
 838         struct k_sigaction new_ka, old_ka;
 839         int ret;
 840
 841         /* XXX: Don't preclude handling different sized sigset_t's.  */
 842         if (sigsetsize != sizeof(sigset_t))
 843                 return -EINVAL;
 844
 845         if (act) {
 846                 new_ka.ka_restorer = restorer;
 847                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 848                         return -EFAULT;
 849         }
 850
 851         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 852
 853         if (!ret && oact) {
 854                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 855                         return -EFAULT;
 856         }
 857
 858         return ret;
 859 }
 860
 861 /* Invoked by rtrap code to update performance counters in
 862  * user space.
 863  */
 864 asmlinkage void update_perfctrs(void)
 865 {
 866         unsigned long pic, tmp;
 867
 868         read_pic(pic);
 869         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 870         __put_user(tmp, current_thread_info()->user_cntd0);
 871         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 872         __put_user(tmp, current_thread_info()->user_cntd1);
 873         reset_pic();
 874 }
 875
 876 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 877 {
 878         int err = 0;
 879
 880         switch(opcode) {
 881         case PERFCTR_ON:
 882                 current_thread_info()->pcr_reg = arg2;
 883                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 884                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 885                 current_thread_info()->kernel_cntd0 =
 886                         current_thread_info()->kernel_cntd1 = 0;
 887                 write_pcr(arg2);
 888                 reset_pic();
 889                 set_thread_flag(TIF_PERFCTR);
 890                 break;
 891
 892         case PERFCTR_OFF:
 893                 err = -EINVAL;
 894                 if (test_thread_flag(TIF_PERFCTR)) {
 895                         current_thread_info()->user_cntd0 =
 896                                 current_thread_info()->user_cntd1 = NULL;
 897                         current_thread_info()->pcr_reg = 0;
 898                         write_pcr(0);
 899                         clear_thread_flag(TIF_PERFCTR);
 900                         err = 0;
 901                 }
 902                 break;
 903
 904         case PERFCTR_READ: {
 905                 unsigned long pic, tmp;
 906
 907                 if (!test_thread_flag(TIF_PERFCTR)) {
 908                         err = -EINVAL;
 909                         break;
 910                 }
 911                 read_pic(pic);
 912                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 913                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 914                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 915                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 916                 reset_pic();
 917                 break;
 918         }
 919
 920         case PERFCTR_CLRPIC:
 921                 if (!test_thread_flag(TIF_PERFCTR)) {
 922                         err = -EINVAL;
 923                         break;
 924                 }
 925                 current_thread_info()->kernel_cntd0 =
 926                         current_thread_info()->kernel_cntd1 = 0;
 927                 reset_pic();
 928                 break;
 929
 930         case PERFCTR_SETPCR: {
 931                 u64 __user *user_pcr = (u64 __user *)arg0;
 932
 933                 if (!test_thread_flag(TIF_PERFCTR)) {
 934                         err = -EINVAL;
 935                         break;
 936                 }
 937                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 938                 write_pcr(current_thread_info()->pcr_reg);
 939                 current_thread_info()->kernel_cntd0 =
 940                         current_thread_info()->kernel_cntd1 = 0;
 941                 reset_pic();
 942                 break;
 943         }
 944
 945         case PERFCTR_GETPCR: {
 946                 u64 __user *user_pcr = (u64 __user *)arg0;
 947
 948                 if (!test_thread_flag(TIF_PERFCTR)) {
 949                         err = -EINVAL;
 950                         break;
 951                 }
 952                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 953                 break;
 954         }
 955
 956         default:
 957                 err = -EINVAL;
 958                 break;
 959         };
 960         return err;
 961 }