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/smp_lock.h>
  23 #include <linux/slab.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/ipc.h>
  26 #include <linux/personality.h>
  27 #include <linux/random.h>
  28
  29 #include <asm/uaccess.h>
  30 #include <asm/ipc.h>
  31 #include <asm/utrap.h>
  32 #include <asm/perfctr.h>
  33 #include <asm/a.out.h>
  34 #include <asm/unistd.h>
  35
  36 /* #define DEBUG_UNIMP_SYSCALL */
  37
  38 asmlinkage unsigned long sys_getpagesize(void)
  39 {
  40         return PAGE_SIZE;
  41 }
  42
  43 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
  44 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
  45
  46 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  47  * overflow past the end of the 64-bit address space?
  48  */
  49 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  50 {
  51         unsigned long va_exclude_start, va_exclude_end;
  52
  53         va_exclude_start = VA_EXCLUDE_START;
  54         va_exclude_end   = VA_EXCLUDE_END;
  55
  56         if (unlikely(len >= va_exclude_start))
  57                 return 1;
  58
  59         if (unlikely((addr + len) < addr))
  60                 return 1;
  61
  62         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  63                      ((addr + len) >= va_exclude_start &&
  64                       (addr + len) < va_exclude_end)))
  65                 return 1;
  66
  67         return 0;
  68 }
  69
  70 /* Does start,end straddle the VA-space hole?  */
  71 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  72 {
  73         unsigned long va_exclude_start, va_exclude_end;
  74
  75         va_exclude_start = VA_EXCLUDE_START;
  76         va_exclude_end   = VA_EXCLUDE_END;
  77
  78         if (likely(start < va_exclude_start && end < va_exclude_start))
  79                 return 0;
  80
  81         if (likely(start >= va_exclude_end && end >= va_exclude_end))
  82                 return 0;
  83
  84         return 1;
  85 }
  86
  87 /* These functions differ from the default implementations in
  88  * mm/mmap.c in two ways:
  89  *
  90  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  91  *    for fixed such mappings we just validate what the user gave us.
  92  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  93  *    the spitfire/niagara VA-hole.
  94  */
  95
  96 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  97                                          unsigned long pgoff)
  98 {
  99         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
 100         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 101
 102         return base + off;
 103 }
 104
 105 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 106                                               unsigned long pgoff)
 107 {
 108         unsigned long base = addr & ~(SHMLBA-1);
 109         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 110
 111         if (base + off <= addr)
 112                 return base + off;
 113         return base - off;
 114 }
 115
 116 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 117 {
 118         struct mm_struct *mm = current->mm;
 119         struct vm_area_struct * vma;
 120         unsigned long task_size = TASK_SIZE;
 121         unsigned long start_addr;
 122         int do_color_align;
 123
 124         if (flags & MAP_FIXED) {
 125                 /* We do not accept a shared mapping if it would violate
 126                  * cache aliasing constraints.
 127                  */
 128                 if ((flags & MAP_SHARED) &&
 129                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 130                         return -EINVAL;
 131                 return addr;
 132         }
 133
 134         if (test_thread_flag(TIF_32BIT))
 135                 task_size = STACK_TOP32;
 136         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 137                 return -ENOMEM;
 138
 139         do_color_align = 0;
 140         if (filp || (flags & MAP_SHARED))
 141                 do_color_align = 1;
 142
 143         if (addr) {
 144                 if (do_color_align)
 145                         addr = COLOUR_ALIGN(addr, pgoff);
 146                 else
 147                         addr = PAGE_ALIGN(addr);
 148
 149                 vma = find_vma(mm, addr);
 150                 if (task_size - len >= addr &&
 151                     (!vma || addr + len <= vma->vm_start))
 152                         return addr;
 153         }
 154
 155         if (len > mm->cached_hole_size) {
 156                 start_addr = addr = mm->free_area_cache;
 157         } else {
 158                 start_addr = addr = TASK_UNMAPPED_BASE;
 159                 mm->cached_hole_size = 0;
 160         }
 161
 162         task_size -= len;
 163
 164 full_search:
 165         if (do_color_align)
 166                 addr = COLOUR_ALIGN(addr, pgoff);
 167         else
 168                 addr = PAGE_ALIGN(addr);
 169
 170         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 171                 /* At this point:  (!vma || addr < vma->vm_end). */
 172                 if (addr < VA_EXCLUDE_START &&
 173                     (addr + len) >= VA_EXCLUDE_START) {
 174                         addr = VA_EXCLUDE_END;
 175                         vma = find_vma(mm, VA_EXCLUDE_END);
 176                 }
 177                 if (unlikely(task_size < addr)) {
 178                         if (start_addr != TASK_UNMAPPED_BASE) {
 179                                 start_addr = addr = TASK_UNMAPPED_BASE;
 180                                 mm->cached_hole_size = 0;
 181                                 goto full_search;
 182                         }
 183                         return -ENOMEM;
 184                 }
 185                 if (likely(!vma || addr + len <= vma->vm_start)) {
 186                         /*
 187                          * Remember the place where we stopped the search:
 188                          */
 189                         mm->free_area_cache = addr + len;
 190                         return addr;
 191                 }
 192                 if (addr + mm->cached_hole_size < vma->vm_start)
 193                         mm->cached_hole_size = vma->vm_start - addr;
 194
 195                 addr = vma->vm_end;
 196                 if (do_color_align)
 197                         addr = COLOUR_ALIGN(addr, pgoff);
 198         }
 199 }
 200
 201 unsigned long
 202 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 203                           const unsigned long len, const unsigned long pgoff,
 204                           const unsigned long flags)
 205 {
 206         struct vm_area_struct *vma;
 207         struct mm_struct *mm = current->mm;
 208         unsigned long task_size = STACK_TOP32;
 209         unsigned long addr = addr0;
 210         int do_color_align;
 211
 212         /* This should only ever run for 32-bit processes.  */
 213         BUG_ON(!test_thread_flag(TIF_32BIT));
 214
 215         if (flags & MAP_FIXED) {
 216                 /* We do not accept a shared mapping if it would violate
 217                  * cache aliasing constraints.
 218                  */
 219                 if ((flags & MAP_SHARED) &&
 220                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 221                         return -EINVAL;
 222                 return addr;
 223         }
 224
 225         if (unlikely(len > task_size))
 226                 return -ENOMEM;
 227
 228         do_color_align = 0;
 229         if (filp || (flags & MAP_SHARED))
 230                 do_color_align = 1;
 231
 232         /* requesting a specific address */
 233         if (addr) {
 234                 if (do_color_align)
 235                         addr = COLOUR_ALIGN(addr, pgoff);
 236                 else
 237                         addr = PAGE_ALIGN(addr);
 238
 239                 vma = find_vma(mm, addr);
 240                 if (task_size - len >= addr &&
 241                     (!vma || addr + len <= vma->vm_start))
 242                         return addr;
 243         }
 244
 245         /* check if free_area_cache is useful for us */
 246         if (len <= mm->cached_hole_size) {
 247                 mm->cached_hole_size = 0;
 248                 mm->free_area_cache = mm->mmap_base;
 249         }
 250
 251         /* either no address requested or can't fit in requested address hole */
 252         addr = mm->free_area_cache;
 253         if (do_color_align) {
 254                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 255
 256                 addr = base + len;
 257         }
 258
 259         /* make sure it can fit in the remaining address space */
 260         if (likely(addr > len)) {
 261                 vma = find_vma(mm, addr-len);
 262                 if (!vma || addr <= vma->vm_start) {
 263                         /* remember the address as a hint for next time */
 264                         return (mm->free_area_cache = addr-len);
 265                 }
 266         }
 267
 268         if (unlikely(mm->mmap_base < len))
 269                 goto bottomup;
 270
 271         addr = mm->mmap_base-len;
 272         if (do_color_align)
 273                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 274
 275         do {
 276                 /*
 277                  * Lookup failure means no vma is above this address,
 278                  * else if new region fits below vma->vm_start,
 279                  * return with success:
 280                  */
 281                 vma = find_vma(mm, addr);
 282                 if (likely(!vma || addr+len <= vma->vm_start)) {
 283                         /* remember the address as a hint for next time */
 284                         return (mm->free_area_cache = addr);
 285                 }
 286
 287                 /* remember the largest hole we saw so far */
 288                 if (addr + mm->cached_hole_size < vma->vm_start)
 289                         mm->cached_hole_size = vma->vm_start - addr;
 290
 291                 /* try just below the current vma->vm_start */
 292                 addr = vma->vm_start-len;
 293                 if (do_color_align)
 294                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 295         } while (likely(len < vma->vm_start));
 296
 297 bottomup:
 298         /*
 299          * A failed mmap() very likely causes application failure,
 300          * so fall back to the bottom-up function here. This scenario
 301          * can happen with large stack limits and large mmap()
 302          * allocations.
 303          */
 304         mm->cached_hole_size = ~0UL;
 305         mm->free_area_cache = TASK_UNMAPPED_BASE;
 306         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 307         /*
 308          * Restore the topdown base:
 309          */
 310         mm->free_area_cache = mm->mmap_base;
 311         mm->cached_hole_size = ~0UL;
 312
 313         return addr;
 314 }
 315
 316 /* Try to align mapping such that we align it as much as possible. */
 317 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 318 {
 319         unsigned long align_goal, addr = -ENOMEM;
 320
 321         if (flags & MAP_FIXED) {
 322                 /* Ok, don't mess with it. */
 323                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
 324         }
 325         flags &= ~MAP_SHARED;
 326
 327         align_goal = PAGE_SIZE;
 328         if (len >= (4UL * 1024 * 1024))
 329                 align_goal = (4UL * 1024 * 1024);
 330         else if (len >= (512UL * 1024))
 331                 align_goal = (512UL * 1024);
 332         else if (len >= (64UL * 1024))
 333                 align_goal = (64UL * 1024);
 334
 335         do {
 336                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 337                 if (!(addr & ~PAGE_MASK)) {
 338                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 339                         break;
 340                 }
 341
 342                 if (align_goal == (4UL * 1024 * 1024))
 343                         align_goal = (512UL * 1024);
 344                 else if (align_goal == (512UL * 1024))
 345                         align_goal = (64UL * 1024);
 346                 else
 347                         align_goal = PAGE_SIZE;
 348         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 349
 350         /* Mapping is smaller than 64K or larger areas could not
 351          * be obtained.
 352          */
 353         if (addr & ~PAGE_MASK)
 354                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 355
 356         return addr;
 357 }
 358
 359 /* Essentially the same as PowerPC... */
 360 void arch_pick_mmap_layout(struct mm_struct *mm)
 361 {
 362         unsigned long random_factor = 0UL;
 363
 364         if (current->flags & PF_RANDOMIZE) {
 365                 random_factor = get_random_int();
 366                 if (test_thread_flag(TIF_32BIT))
 367                         random_factor &= ((1 * 1024 * 1024) - 1);
 368                 else
 369                         random_factor = ((random_factor << PAGE_SHIFT) &
 370                                          0xffffffffUL);
 371         }
 372
 373         /*
 374          * Fall back to the standard layout if the personality
 375          * bit is set, or if the expected stack growth is unlimited:
 376          */
 377         if (!test_thread_flag(TIF_32BIT) ||
 378             (current->personality & ADDR_COMPAT_LAYOUT) ||
 379             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 380             sysctl_legacy_va_layout) {
 381                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 382                 mm->get_unmapped_area = arch_get_unmapped_area;
 383                 mm->unmap_area = arch_unmap_area;
 384         } else {
 385                 /* We know it's 32-bit */
 386                 unsigned long task_size = STACK_TOP32;
 387                 unsigned long gap;
 388
 389                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 390                 if (gap < 128 * 1024 * 1024)
 391                         gap = 128 * 1024 * 1024;
 392                 if (gap > (task_size / 6 * 5))
 393                         gap = (task_size / 6 * 5);
 394
 395                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 396                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 397                 mm->unmap_area = arch_unmap_area_topdown;
 398         }
 399 }
 400
 401 asmlinkage unsigned long sparc_brk(unsigned long brk)
 402 {
 403         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 404         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 405                 return current->mm->brk;
 406
 407         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 408                 return current->mm->brk;
 409
 410         return sys_brk(brk);
 411 }
 412
 413 /*
 414  * sys_pipe() is the normal C calling standard for creating
 415  * a pipe. It's not the way unix traditionally does this, though.
 416  */
 417 asmlinkage long sparc_pipe(struct pt_regs *regs)
 418 {
 419         int fd[2];
 420         int error;
 421
 422         error = do_pipe(fd);
 423         if (error)
 424                 goto out;
 425         regs->u_regs[UREG_I1] = fd[1];
 426         error = fd[0];
 427 out:
 428         return error;
 429 }
 430
 431 /*
 432  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 433  *
 434  * This is really horribly ugly.
 435  */
 436
 437 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
 438                         unsigned long third, void __user *ptr, long fifth)
 439 {
 440         int err;
 441
 442         /* No need for backward compatibility. We can start fresh... */
 443         if (call <= SEMCTL) {
 444                 switch (call) {
 445                 case SEMOP:
 446                         err = sys_semtimedop(first, ptr,
 447                                              (unsigned)second, NULL);
 448                         goto out;
 449                 case SEMTIMEDOP:
 450                         err = sys_semtimedop(first, ptr, (unsigned)second,
 451                                 (const struct timespec __user *) fifth);
 452                         goto out;
 453                 case SEMGET:
 454                         err = sys_semget(first, (int)second, (int)third);
 455                         goto out;
 456                 case SEMCTL: {
 457                         union semun fourth;
 458                         err = -EINVAL;
 459                         if (!ptr)
 460                                 goto out;
 461                         err = -EFAULT;
 462                         if (get_user(fourth.__pad,
 463                                      (void __user * __user *) ptr))
 464                                 goto out;
 465                         err = sys_semctl(first, (int)second | IPC_64,
 466                                          (int)third, fourth);
 467                         goto out;
 468                 }
 469                 default:
 470                         err = -ENOSYS;
 471                         goto out;
 472                 };
 473         }
 474         if (call <= MSGCTL) {
 475                 switch (call) {
 476                 case MSGSND:
 477                         err = sys_msgsnd(first, ptr, (size_t)second,
 478                                          (int)third);
 479                         goto out;
 480                 case MSGRCV:
 481                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 482                                          (int)third);
 483                         goto out;
 484                 case MSGGET:
 485                         err = sys_msgget((key_t)first, (int)second);
 486                         goto out;
 487                 case MSGCTL:
 488                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 489                         goto out;
 490                 default:
 491                         err = -ENOSYS;
 492                         goto out;
 493                 };
 494         }
 495         if (call <= SHMCTL) {
 496                 switch (call) {
 497                 case SHMAT: {
 498                         ulong raddr;
 499                         err = do_shmat(first, ptr, (int)second, &raddr);
 500                         if (!err) {
 501                                 if (put_user(raddr,
 502                                              (ulong __user *) third))
 503                                         err = -EFAULT;
 504                         }
 505                         goto out;
 506                 }
 507                 case SHMDT:
 508                         err = sys_shmdt(ptr);
 509                         goto out;
 510                 case SHMGET:
 511                         err = sys_shmget(first, (size_t)second, (int)third);
 512                         goto out;
 513                 case SHMCTL:
 514                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 515                         goto out;
 516                 default:
 517                         err = -ENOSYS;
 518                         goto out;
 519                 };
 520         } else {
 521                 err = -ENOSYS;
 522         }
 523 out:
 524         return err;
 525 }
 526
 527 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 528 {
 529         int ret = sys_newuname(name);
 530
 531         if (current->personality == PER_LINUX32 && !ret) {
 532                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 533                        ? -EFAULT : 0);
 534         }
 535         return ret;
 536 }
 537
 538 asmlinkage long sparc64_personality(unsigned long personality)
 539 {
 540         int ret;
 541
 542         if (current->personality == PER_LINUX32 &&
 543             personality == PER_LINUX)
 544                 personality = PER_LINUX32;
 545         ret = sys_personality(personality);
 546         if (ret == PER_LINUX32)
 547                 ret = PER_LINUX;
 548
 549         return ret;
 550 }
 551
 552 int sparc64_mmap_check(unsigned long addr, unsigned long len,
 553                 unsigned long flags)
 554 {
 555         if (test_thread_flag(TIF_32BIT)) {
 556                 if (len >= STACK_TOP32)
 557                         return -EINVAL;
 558
 559                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 560                         return -EINVAL;
 561         } else {
 562                 if (len >= VA_EXCLUDE_START)
 563                         return -EINVAL;
 564
 565                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 566                         return -EINVAL;
 567         }
 568
 569         return 0;
 570 }
 571
 572 /* Linux version of mmap */
 573 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 574         unsigned long prot, unsigned long flags, unsigned long fd,
 575         unsigned long off)
 576 {
 577         struct file * file = NULL;
 578         unsigned long retval = -EBADF;
 579
 580         if (!(flags & MAP_ANONYMOUS)) {
 581                 file = fget(fd);
 582                 if (!file)
 583                         goto out;
 584         }
 585         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 586         len = PAGE_ALIGN(len);
 587
 588         down_write(&current->mm->mmap_sem);
 589         retval = do_mmap(file, addr, len, prot, flags, off);
 590         up_write(&current->mm->mmap_sem);
 591
 592         if (file)
 593                 fput(file);
 594 out:
 595         return retval;
 596 }
 597
 598 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 599 {
 600         long ret;
 601
 602         if (invalid_64bit_range(addr, len))
 603                 return -EINVAL;
 604
 605         down_write(&current->mm->mmap_sem);
 606         ret = do_munmap(current->mm, addr, len);
 607         up_write(&current->mm->mmap_sem);
 608         return ret;
 609 }
 610
 611 extern unsigned long do_mremap(unsigned long addr,
 612         unsigned long old_len, unsigned long new_len,
 613         unsigned long flags, unsigned long new_addr);
 614
 615 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 616         unsigned long old_len, unsigned long new_len,
 617         unsigned long flags, unsigned long new_addr)
 618 {
 619         struct vm_area_struct *vma;
 620         unsigned long ret = -EINVAL;
 621
 622         if (test_thread_flag(TIF_32BIT))
 623                 goto out;
 624         if (unlikely(new_len >= VA_EXCLUDE_START))
 625                 goto out;
 626         if (unlikely(invalid_64bit_range(addr, old_len)))
 627                 goto out;
 628
 629         down_write(&current->mm->mmap_sem);
 630         if (flags & MREMAP_FIXED) {
 631                 if (invalid_64bit_range(new_addr, new_len))
 632                         goto out_sem;
 633         } else if (invalid_64bit_range(addr, new_len)) {
 634                 unsigned long map_flags = 0;
 635                 struct file *file = NULL;
 636
 637                 ret = -ENOMEM;
 638                 if (!(flags & MREMAP_MAYMOVE))
 639                         goto out_sem;
 640
 641                 vma = find_vma(current->mm, addr);
 642                 if (vma) {
 643                         if (vma->vm_flags & VM_SHARED)
 644                                 map_flags |= MAP_SHARED;
 645                         file = vma->vm_file;
 646                 }
 647
 648                 /* MREMAP_FIXED checked above. */
 649                 new_addr = get_unmapped_area(file, addr, new_len,
 650                                     vma ? vma->vm_pgoff : 0,
 651                                     map_flags);
 652                 ret = new_addr;
 653                 if (new_addr & ~PAGE_MASK)
 654                         goto out_sem;
 655                 flags |= MREMAP_FIXED;
 656         }
 657         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 658 out_sem:
 659         up_write(&current->mm->mmap_sem);
 660 out:
 661         return ret;
 662 }
 663
 664 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 665 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 666 {
 667         static int count;
 668
 669         /* Don't make the system unusable, if someone goes stuck */
 670         if (count++ > 5)
 671                 return -ENOSYS;
 672
 673         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 674 #ifdef DEBUG_UNIMP_SYSCALL
 675         show_regs (regs);
 676 #endif
 677
 678         return -ENOSYS;
 679 }
 680
 681 /* #define DEBUG_SPARC_BREAKPOINT */
 682
 683 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 684 {
 685         siginfo_t info;
 686
 687         if (test_thread_flag(TIF_32BIT)) {
 688                 regs->tpc &= 0xffffffff;
 689                 regs->tnpc &= 0xffffffff;
 690         }
 691 #ifdef DEBUG_SPARC_BREAKPOINT
 692         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 693 #endif
 694         info.si_signo = SIGTRAP;
 695         info.si_errno = 0;
 696         info.si_code = TRAP_BRKPT;
 697         info.si_addr = (void __user *)regs->tpc;
 698         info.si_trapno = 0;
 699         force_sig_info(SIGTRAP, &info, current);
 700 #ifdef DEBUG_SPARC_BREAKPOINT
 701         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 702 #endif
 703 }
 704
 705 extern void check_pending(int signum);
 706
 707 asmlinkage long sys_getdomainname(char __user *name, int len)
 708 {
 709         int nlen, err;
 710
 711         if (len < 0)
 712                 return -EINVAL;
 713
 714         down_read(&uts_sem);
 715
 716         nlen = strlen(utsname()->domainname) + 1;
 717         err = -EINVAL;
 718         if (nlen > len)
 719                 goto out;
 720
 721         err = -EFAULT;
 722         if (!copy_to_user(name, utsname()->domainname, nlen))
 723                 err = 0;
 724
 725 out:
 726         up_read(&uts_sem);
 727         return err;
 728 }
 729
 730 asmlinkage long solaris_syscall(struct pt_regs *regs)
 731 {
 732         static int count;
 733
 734         regs->tpc = regs->tnpc;
 735         regs->tnpc += 4;
 736         if (test_thread_flag(TIF_32BIT)) {
 737                 regs->tpc &= 0xffffffff;
 738                 regs->tnpc &= 0xffffffff;
 739         }
 740         if (++count <= 5) {
 741                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 742                 show_regs (regs);
 743         }
 744         send_sig(SIGSEGV, current, 1);
 745
 746         return -ENOSYS;
 747 }
 748
 749 #ifndef CONFIG_SUNOS_EMUL
 750 asmlinkage long sunos_syscall(struct pt_regs *regs)
 751 {
 752         static int count;
 753
 754         regs->tpc = regs->tnpc;
 755         regs->tnpc += 4;
 756         if (test_thread_flag(TIF_32BIT)) {
 757                 regs->tpc &= 0xffffffff;
 758                 regs->tnpc &= 0xffffffff;
 759         }
 760         if (++count <= 20)
 761                 printk ("SunOS binary emulation not compiled in\n");
 762         force_sig(SIGSEGV, current);
 763
 764         return -ENOSYS;
 765 }
 766 #endif
 767
 768 asmlinkage long sys_utrap_install(utrap_entry_t type,
 769                                   utrap_handler_t new_p,
 770                                   utrap_handler_t new_d,
 771                                   utrap_handler_t __user *old_p,
 772                                   utrap_handler_t __user *old_d)
 773 {
 774         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 775                 return -EINVAL;
 776         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 777                 if (old_p) {
 778                         if (!current_thread_info()->utraps) {
 779                                 if (put_user(NULL, old_p))
 780                                         return -EFAULT;
 781                         } else {
 782                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 783                                         return -EFAULT;
 784                         }
 785                 }
 786                 if (old_d) {
 787                         if (put_user(NULL, old_d))
 788                                 return -EFAULT;
 789                 }
 790                 return 0;
 791         }
 792         if (!current_thread_info()->utraps) {
 793                 current_thread_info()->utraps =
 794                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 795                 if (!current_thread_info()->utraps)
 796                         return -ENOMEM;
 797                 current_thread_info()->utraps[0] = 1;
 798         } else {
 799                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 800                     current_thread_info()->utraps[0] > 1) {
 801                         long *p = current_thread_info()->utraps;
 802
 803                         current_thread_info()->utraps =
 804                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 805                                         GFP_KERNEL);
 806                         if (!current_thread_info()->utraps) {
 807                                 current_thread_info()->utraps = p;
 808                                 return -ENOMEM;
 809                         }
 810                         p[0]--;
 811                         current_thread_info()->utraps[0] = 1;
 812                         memcpy(current_thread_info()->utraps+1, p+1,
 813                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 814                 }
 815         }
 816         if (old_p) {
 817                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 818                         return -EFAULT;
 819         }
 820         if (old_d) {
 821                 if (put_user(NULL, old_d))
 822                         return -EFAULT;
 823         }
 824         current_thread_info()->utraps[type] = (long)new_p;
 825
 826         return 0;
 827 }
 828
 829 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 830 {
 831         if (model >= 3)
 832                 return -EINVAL;
 833         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 834         return 0;
 835 }
 836
 837 asmlinkage long sys_rt_sigaction(int sig,
 838                                  const struct sigaction __user *act,
 839                                  struct sigaction __user *oact,
 840                                  void __user *restorer,
 841                                  size_t sigsetsize)
 842 {
 843         struct k_sigaction new_ka, old_ka;
 844         int ret;
 845
 846         /* XXX: Don't preclude handling different sized sigset_t's.  */
 847         if (sigsetsize != sizeof(sigset_t))
 848                 return -EINVAL;
 849
 850         if (act) {
 851                 new_ka.ka_restorer = restorer;
 852                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 853                         return -EFAULT;
 854         }
 855
 856         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 857
 858         if (!ret && oact) {
 859                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 860                         return -EFAULT;
 861         }
 862
 863         return ret;
 864 }
 865
 866 /* Invoked by rtrap code to update performance counters in
 867  * user space.
 868  */
 869 asmlinkage void update_perfctrs(void)
 870 {
 871         unsigned long pic, tmp;
 872
 873         read_pic(pic);
 874         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 875         __put_user(tmp, current_thread_info()->user_cntd0);
 876         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 877         __put_user(tmp, current_thread_info()->user_cntd1);
 878         reset_pic();
 879 }
 880
 881 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 882 {
 883         int err = 0;
 884
 885         switch(opcode) {
 886         case PERFCTR_ON:
 887                 current_thread_info()->pcr_reg = arg2;
 888                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 889                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 890                 current_thread_info()->kernel_cntd0 =
 891                         current_thread_info()->kernel_cntd1 = 0;
 892                 write_pcr(arg2);
 893                 reset_pic();
 894                 set_thread_flag(TIF_PERFCTR);
 895                 break;
 896
 897         case PERFCTR_OFF:
 898                 err = -EINVAL;
 899                 if (test_thread_flag(TIF_PERFCTR)) {
 900                         current_thread_info()->user_cntd0 =
 901                                 current_thread_info()->user_cntd1 = NULL;
 902                         current_thread_info()->pcr_reg = 0;
 903                         write_pcr(0);
 904                         clear_thread_flag(TIF_PERFCTR);
 905                         err = 0;
 906                 }
 907                 break;
 908
 909         case PERFCTR_READ: {
 910                 unsigned long pic, tmp;
 911
 912                 if (!test_thread_flag(TIF_PERFCTR)) {
 913                         err = -EINVAL;
 914                         break;
 915                 }
 916                 read_pic(pic);
 917                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 918                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 919                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 920                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 921                 reset_pic();
 922                 break;
 923         }
 924
 925         case PERFCTR_CLRPIC:
 926                 if (!test_thread_flag(TIF_PERFCTR)) {
 927                         err = -EINVAL;
 928                         break;
 929                 }
 930                 current_thread_info()->kernel_cntd0 =
 931                         current_thread_info()->kernel_cntd1 = 0;
 932                 reset_pic();
 933                 break;
 934
 935         case PERFCTR_SETPCR: {
 936                 u64 __user *user_pcr = (u64 __user *)arg0;
 937
 938                 if (!test_thread_flag(TIF_PERFCTR)) {
 939                         err = -EINVAL;
 940                         break;
 941                 }
 942                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 943                 write_pcr(current_thread_info()->pcr_reg);
 944                 current_thread_info()->kernel_cntd0 =
 945                         current_thread_info()->kernel_cntd1 = 0;
 946                 reset_pic();
 947                 break;
 948         }
 949
 950         case PERFCTR_GETPCR: {
 951                 u64 __user *user_pcr = (u64 __user *)arg0;
 952
 953                 if (!test_thread_flag(TIF_PERFCTR)) {
 954                         err = -EINVAL;
 955                         break;
 956                 }
 957                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 958                 break;
 959         }
 960
 961         default:
 962                 err = -EINVAL;
 963                 break;
 964         };
 965         return err;
 966 }
 967
 968 /*
 969  * Do a system call from kernel instead of calling sys_execve so we
 970  * end up with proper pt_regs.
 971  */
 972 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 973 {
 974         long __res;
 975         register long __g1 __asm__ ("g1") = __NR_execve;
 976         register long __o0 __asm__ ("o0") = (long)(filename);
 977         register long __o1 __asm__ ("o1") = (long)(argv);
 978         register long __o2 __asm__ ("o2") = (long)(envp);
 979         asm volatile ("t 0x6d\n\t"
 980                       "sub %%g0, %%o0, %0\n\t"
 981                       "movcc %%xcc, %%o0, %0\n\t"
 982                       : "=r" (__res), "=&r" (__o0)
 983                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 984                       : "cc");
 985         return __res;
 986 }