release/src-rt-6.x/linux/linux-2.6/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/errno.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/mm.h>
  15 #include <linux/sem.h>
  16 #include <linux/msg.h>
  17 #include <linux/shm.h>
  18 #include <linux/stat.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/slab.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/ipc.h>
  25 #include <linux/personality.h>
  26 #include <linux/random.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/ipc.h>
  30 #include <asm/utrap.h>
  31 #include <asm/perfctr.h>
  32 #include <asm/a.out.h>
  33 #include <asm/unistd.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         unsigned long random_factor = 0UL;
 362
 363         if (current->flags & PF_RANDOMIZE) {
 364                 random_factor = get_random_int();
 365                 if (test_thread_flag(TIF_32BIT))
 366                         random_factor &= ((1 * 1024 * 1024) - 1);
 367                 else
 368                         random_factor = ((random_factor << PAGE_SHIFT) &
 369                                          0xffffffffUL);
 370         }
 371
 372         /*
 373          * Fall back to the standard layout if the personality
 374          * bit is set, or if the expected stack growth is unlimited:
 375          */
 376         if (!test_thread_flag(TIF_32BIT) ||
 377             (current->personality & ADDR_COMPAT_LAYOUT) ||
 378             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 379             sysctl_legacy_va_layout) {
 380                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 381                 mm->get_unmapped_area = arch_get_unmapped_area;
 382                 mm->unmap_area = arch_unmap_area;
 383         } else {
 384                 /* We know it's 32-bit */
 385                 unsigned long task_size = STACK_TOP32;
 386                 unsigned long gap;
 387
 388                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 389                 if (gap < 128 * 1024 * 1024)
 390                         gap = 128 * 1024 * 1024;
 391                 if (gap > (task_size / 6 * 5))
 392                         gap = (task_size / 6 * 5);
 393
 394                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 395                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 396                 mm->unmap_area = arch_unmap_area_topdown;
 397         }
 398 }
 399
 400 asmlinkage unsigned long sparc_brk(unsigned long brk)
 401 {
 402         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 403         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 404                 return current->mm->brk;
 405
 406         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 407                 return current->mm->brk;
 408
 409         return sys_brk(brk);
 410 }
 411
 412 /*
 413  * sys_pipe() is the normal C calling standard for creating
 414  * a pipe. It's not the way unix traditionally does this, though.
 415  */
 416 asmlinkage long sparc_pipe(struct pt_regs *regs)
 417 {
 418         int fd[2];
 419         int error;
 420
 421         error = do_pipe(fd);
 422         if (error)
 423                 goto out;
 424         regs->u_regs[UREG_I1] = fd[1];
 425         error = fd[0];
 426 out:
 427         return error;
 428 }
 429
 430 /*
 431  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 432  *
 433  * This is really horribly ugly.
 434  */
 435
 436 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 437                         unsigned long third, void __user *ptr, long fifth)
 438 {
 439         long err;
 440
 441         /* No need for backward compatibility. We can start fresh... */
 442         if (call <= SEMCTL) {
 443                 switch (call) {
 444                 case SEMOP:
 445                         err = sys_semtimedop(first, ptr,
 446                                              (unsigned)second, NULL);
 447                         goto out;
 448                 case SEMTIMEDOP:
 449                         err = sys_semtimedop(first, ptr, (unsigned)second,
 450                                 (const struct timespec __user *) fifth);
 451                         goto out;
 452                 case SEMGET:
 453                         err = sys_semget(first, (int)second, (int)third);
 454                         goto out;
 455                 case SEMCTL: {
 456                         err = sys_semctl(first, third,
 457                                          (int)second | IPC_64,
 458                                          (union semun) ptr);
 459                         goto out;
 460                 }
 461                 default:
 462                         err = -ENOSYS;
 463                         goto out;
 464                 };
 465         }
 466         if (call <= MSGCTL) {
 467                 switch (call) {
 468                 case MSGSND:
 469                         err = sys_msgsnd(first, ptr, (size_t)second,
 470                                          (int)third);
 471                         goto out;
 472                 case MSGRCV:
 473                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 474                                          (int)third);
 475                         goto out;
 476                 case MSGGET:
 477                         err = sys_msgget((key_t)first, (int)second);
 478                         goto out;
 479                 case MSGCTL:
 480                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 481                         goto out;
 482                 default:
 483                         err = -ENOSYS;
 484                         goto out;
 485                 };
 486         }
 487         if (call <= SHMCTL) {
 488                 switch (call) {
 489                 case SHMAT: {
 490                         ulong raddr;
 491                         err = do_shmat(first, ptr, (int)second, &raddr);
 492                         if (!err) {
 493                                 if (put_user(raddr,
 494                                              (ulong __user *) third))
 495                                         err = -EFAULT;
 496                         }
 497                         goto out;
 498                 }
 499                 case SHMDT:
 500                         err = sys_shmdt(ptr);
 501                         goto out;
 502                 case SHMGET:
 503                         err = sys_shmget(first, (size_t)second, (int)third);
 504                         goto out;
 505                 case SHMCTL:
 506                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 507                         goto out;
 508                 default:
 509                         err = -ENOSYS;
 510                         goto out;
 511                 };
 512         } else {
 513                 err = -ENOSYS;
 514         }
 515 out:
 516         return err;
 517 }
 518
 519 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 520 {
 521         int ret = sys_newuname(name);
 522
 523         if (current->personality == PER_LINUX32 && !ret) {
 524                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 525                        ? -EFAULT : 0);
 526         }
 527         return ret;
 528 }
 529
 530 asmlinkage long sparc64_personality(unsigned long personality)
 531 {
 532         int ret;
 533
 534         if (current->personality == PER_LINUX32 &&
 535             personality == PER_LINUX)
 536                 personality = PER_LINUX32;
 537         ret = sys_personality(personality);
 538         if (ret == PER_LINUX32)
 539                 ret = PER_LINUX;
 540
 541         return ret;
 542 }
 543
 544 int sparc64_mmap_check(unsigned long addr, unsigned long len,
 545                 unsigned long flags)
 546 {
 547         if (test_thread_flag(TIF_32BIT)) {
 548                 if (len >= STACK_TOP32)
 549                         return -EINVAL;
 550
 551                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 552                         return -EINVAL;
 553         } else {
 554                 if (len >= VA_EXCLUDE_START)
 555                         return -EINVAL;
 556
 557                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 558                         return -EINVAL;
 559         }
 560
 561         return 0;
 562 }
 563
 564 /* Linux version of mmap */
 565 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 566         unsigned long prot, unsigned long flags, unsigned long fd,
 567         unsigned long off)
 568 {
 569         struct file * file = NULL;
 570         unsigned long retval = -EBADF;
 571
 572         if (!(flags & MAP_ANONYMOUS)) {
 573                 file = fget(fd);
 574                 if (!file)
 575                         goto out;
 576         }
 577         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 578         len = PAGE_ALIGN(len);
 579
 580         down_write(&current->mm->mmap_sem);
 581         retval = do_mmap(file, addr, len, prot, flags, off);
 582         up_write(&current->mm->mmap_sem);
 583
 584         if (file)
 585                 fput(file);
 586 out:
 587         return retval;
 588 }
 589
 590 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 591 {
 592         long ret;
 593
 594         if (invalid_64bit_range(addr, len))
 595                 return -EINVAL;
 596
 597         down_write(&current->mm->mmap_sem);
 598         ret = do_munmap(current->mm, addr, len);
 599         up_write(&current->mm->mmap_sem);
 600         return ret;
 601 }
 602
 603 extern unsigned long do_mremap(unsigned long addr,
 604         unsigned long old_len, unsigned long new_len,
 605         unsigned long flags, unsigned long new_addr);
 606
 607 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 608         unsigned long old_len, unsigned long new_len,
 609         unsigned long flags, unsigned long new_addr)
 610 {
 611         struct vm_area_struct *vma;
 612         unsigned long ret = -EINVAL;
 613
 614         if (test_thread_flag(TIF_32BIT))
 615                 goto out;
 616         if (unlikely(new_len >= VA_EXCLUDE_START))
 617                 goto out;
 618         if (unlikely(invalid_64bit_range(addr, old_len)))
 619                 goto out;
 620
 621         down_write(&current->mm->mmap_sem);
 622         if (flags & MREMAP_FIXED) {
 623                 if (invalid_64bit_range(new_addr, new_len))
 624                         goto out_sem;
 625         } else if (invalid_64bit_range(addr, new_len)) {
 626                 unsigned long map_flags = 0;
 627                 struct file *file = NULL;
 628
 629                 ret = -ENOMEM;
 630                 if (!(flags & MREMAP_MAYMOVE))
 631                         goto out_sem;
 632
 633                 vma = find_vma(current->mm, addr);
 634                 if (vma) {
 635                         if (vma->vm_flags & VM_SHARED)
 636                                 map_flags |= MAP_SHARED;
 637                         file = vma->vm_file;
 638                 }
 639
 640                 /* MREMAP_FIXED checked above. */
 641                 new_addr = get_unmapped_area(file, addr, new_len,
 642                                     vma ? vma->vm_pgoff : 0,
 643                                     map_flags);
 644                 ret = new_addr;
 645                 if (new_addr & ~PAGE_MASK)
 646                         goto out_sem;
 647                 flags |= MREMAP_FIXED;
 648         }
 649         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 650 out_sem:
 651         up_write(&current->mm->mmap_sem);
 652 out:
 653         return ret;
 654 }
 655
 656 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 657 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 658 {
 659         static int count;
 660
 661         /* Don't make the system unusable, if someone goes stuck */
 662         if (count++ > 5)
 663                 return -ENOSYS;
 664
 665         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 666 #ifdef DEBUG_UNIMP_SYSCALL
 667         show_regs (regs);
 668 #endif
 669
 670         return -ENOSYS;
 671 }
 672
 673 /* #define DEBUG_SPARC_BREAKPOINT */
 674
 675 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 676 {
 677         siginfo_t info;
 678
 679         if (test_thread_flag(TIF_32BIT)) {
 680                 regs->tpc &= 0xffffffff;
 681                 regs->tnpc &= 0xffffffff;
 682         }
 683 #ifdef DEBUG_SPARC_BREAKPOINT
 684         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 685 #endif
 686         info.si_signo = SIGTRAP;
 687         info.si_errno = 0;
 688         info.si_code = TRAP_BRKPT;
 689         info.si_addr = (void __user *)regs->tpc;
 690         info.si_trapno = 0;
 691         force_sig_info(SIGTRAP, &info, current);
 692 #ifdef DEBUG_SPARC_BREAKPOINT
 693         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 694 #endif
 695 }
 696
 697 extern void check_pending(int signum);
 698
 699 asmlinkage long sys_getdomainname(char __user *name, int len)
 700 {
 701         int nlen, err;
 702
 703         if (len < 0)
 704                 return -EINVAL;
 705
 706         down_read(&uts_sem);
 707
 708         nlen = strlen(utsname()->domainname) + 1;
 709         err = -EINVAL;
 710         if (nlen > len)
 711                 goto out;
 712
 713         err = -EFAULT;
 714         if (!copy_to_user(name, utsname()->domainname, nlen))
 715                 err = 0;
 716
 717 out:
 718         up_read(&uts_sem);
 719         return err;
 720 }
 721
 722 asmlinkage long solaris_syscall(struct pt_regs *regs)
 723 {
 724         static int count;
 725
 726         regs->tpc = regs->tnpc;
 727         regs->tnpc += 4;
 728         if (test_thread_flag(TIF_32BIT)) {
 729                 regs->tpc &= 0xffffffff;
 730                 regs->tnpc &= 0xffffffff;
 731         }
 732         if (++count <= 5) {
 733                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 734                 show_regs (regs);
 735         }
 736         send_sig(SIGSEGV, current, 1);
 737
 738         return -ENOSYS;
 739 }
 740
 741 #ifndef CONFIG_SUNOS_EMUL
 742 asmlinkage long sunos_syscall(struct pt_regs *regs)
 743 {
 744         static int count;
 745
 746         regs->tpc = regs->tnpc;
 747         regs->tnpc += 4;
 748         if (test_thread_flag(TIF_32BIT)) {
 749                 regs->tpc &= 0xffffffff;
 750                 regs->tnpc &= 0xffffffff;
 751         }
 752         if (++count <= 20)
 753                 printk ("SunOS binary emulation not compiled in\n");
 754         force_sig(SIGSEGV, current);
 755
 756         return -ENOSYS;
 757 }
 758 #endif
 759
 760 asmlinkage long sys_utrap_install(utrap_entry_t type,
 761                                   utrap_handler_t new_p,
 762                                   utrap_handler_t new_d,
 763                                   utrap_handler_t __user *old_p,
 764                                   utrap_handler_t __user *old_d)
 765 {
 766         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 767                 return -EINVAL;
 768         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 769                 if (old_p) {
 770                         if (!current_thread_info()->utraps) {
 771                                 if (put_user(NULL, old_p))
 772                                         return -EFAULT;
 773                         } else {
 774                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 775                                         return -EFAULT;
 776                         }
 777                 }
 778                 if (old_d) {
 779                         if (put_user(NULL, old_d))
 780                                 return -EFAULT;
 781                 }
 782                 return 0;
 783         }
 784         if (!current_thread_info()->utraps) {
 785                 current_thread_info()->utraps =
 786                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 787                 if (!current_thread_info()->utraps)
 788                         return -ENOMEM;
 789                 current_thread_info()->utraps[0] = 1;
 790         } else {
 791                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 792                     current_thread_info()->utraps[0] > 1) {
 793                         long *p = current_thread_info()->utraps;
 794
 795                         current_thread_info()->utraps =
 796                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 797                                         GFP_KERNEL);
 798                         if (!current_thread_info()->utraps) {
 799                                 current_thread_info()->utraps = p;
 800                                 return -ENOMEM;
 801                         }
 802                         p[0]--;
 803                         current_thread_info()->utraps[0] = 1;
 804                         memcpy(current_thread_info()->utraps+1, p+1,
 805                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 806                 }
 807         }
 808         if (old_p) {
 809                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 810                         return -EFAULT;
 811         }
 812         if (old_d) {
 813                 if (put_user(NULL, old_d))
 814                         return -EFAULT;
 815         }
 816         current_thread_info()->utraps[type] = (long)new_p;
 817
 818         return 0;
 819 }
 820
 821 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 822 {
 823         if (model >= 3)
 824                 return -EINVAL;
 825         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 826         return 0;
 827 }
 828
 829 asmlinkage long sys_rt_sigaction(int sig,
 830                                  const struct sigaction __user *act,
 831                                  struct sigaction __user *oact,
 832                                  void __user *restorer,
 833                                  size_t sigsetsize)
 834 {
 835         struct k_sigaction new_ka, old_ka;
 836         int ret;
 837
 838         /* XXX: Don't preclude handling different sized sigset_t's.  */
 839         if (sigsetsize != sizeof(sigset_t))
 840                 return -EINVAL;
 841
 842         if (act) {
 843                 new_ka.ka_restorer = restorer;
 844                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 845                         return -EFAULT;
 846         }
 847
 848         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 849
 850         if (!ret && oact) {
 851                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 852                         return -EFAULT;
 853         }
 854
 855         return ret;
 856 }
 857
 858 /* Invoked by rtrap code to update performance counters in
 859  * user space.
 860  */
 861 asmlinkage void update_perfctrs(void)
 862 {
 863         unsigned long pic, tmp;
 864
 865         read_pic(pic);
 866         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 867         __put_user(tmp, current_thread_info()->user_cntd0);
 868         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 869         __put_user(tmp, current_thread_info()->user_cntd1);
 870         reset_pic();
 871 }
 872
 873 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 874 {
 875         int err = 0;
 876
 877         switch(opcode) {
 878         case PERFCTR_ON:
 879                 current_thread_info()->pcr_reg = arg2;
 880                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 881                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 882                 current_thread_info()->kernel_cntd0 =
 883                         current_thread_info()->kernel_cntd1 = 0;
 884                 write_pcr(arg2);
 885                 reset_pic();
 886                 set_thread_flag(TIF_PERFCTR);
 887                 break;
 888
 889         case PERFCTR_OFF:
 890                 err = -EINVAL;
 891                 if (test_thread_flag(TIF_PERFCTR)) {
 892                         current_thread_info()->user_cntd0 =
 893                                 current_thread_info()->user_cntd1 = NULL;
 894                         current_thread_info()->pcr_reg = 0;
 895                         write_pcr(0);
 896                         clear_thread_flag(TIF_PERFCTR);
 897                         err = 0;
 898                 }
 899                 break;
 900
 901         case PERFCTR_READ: {
 902                 unsigned long pic, tmp;
 903
 904                 if (!test_thread_flag(TIF_PERFCTR)) {
 905                         err = -EINVAL;
 906                         break;
 907                 }
 908                 read_pic(pic);
 909                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 910                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 911                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 912                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 913                 reset_pic();
 914                 break;
 915         }
 916
 917         case PERFCTR_CLRPIC:
 918                 if (!test_thread_flag(TIF_PERFCTR)) {
 919                         err = -EINVAL;
 920                         break;
 921                 }
 922                 current_thread_info()->kernel_cntd0 =
 923                         current_thread_info()->kernel_cntd1 = 0;
 924                 reset_pic();
 925                 break;
 926
 927         case PERFCTR_SETPCR: {
 928                 u64 __user *user_pcr = (u64 __user *)arg0;
 929
 930                 if (!test_thread_flag(TIF_PERFCTR)) {
 931                         err = -EINVAL;
 932                         break;
 933                 }
 934                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 935                 write_pcr(current_thread_info()->pcr_reg);
 936                 current_thread_info()->kernel_cntd0 =
 937                         current_thread_info()->kernel_cntd1 = 0;
 938                 reset_pic();
 939                 break;
 940         }
 941
 942         case PERFCTR_GETPCR: {
 943                 u64 __user *user_pcr = (u64 __user *)arg0;
 944
 945                 if (!test_thread_flag(TIF_PERFCTR)) {
 946                         err = -EINVAL;
 947                         break;
 948                 }
 949                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 950                 break;
 951         }
 952
 953         default:
 954                 err = -EINVAL;
 955                 break;
 956         };
 957         return err;
 958 }
 959
 960 /*
 961  * Do a system call from kernel instead of calling sys_execve so we
 962  * end up with proper pt_regs.
 963  */
 964 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 965 {
 966         long __res;
 967         register long __g1 __asm__ ("g1") = __NR_execve;
 968         register long __o0 __asm__ ("o0") = (long)(filename);
 969         register long __o1 __asm__ ("o1") = (long)(argv);
 970         register long __o2 __asm__ ("o2") = (long)(envp);
 971         asm volatile ("t 0x6d\n\t"
 972                       "sub %%g0, %%o0, %0\n\t"
 973                       "movcc %%xcc, %%o0, %0\n\t"
 974                       : "=r" (__res), "=&r" (__o0)
 975                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 976                       : "cc");
 977         return __res;
 978 }