arch/sparc/kernel/sys_sparc_64.c

   1 /* linux/arch/sparc64/kernel/sys_sparc.c
   2  *
   3  * This file contains various random system calls that
   4  * have a non-standard calling sequence on the Linux/sparc
   5  * platform.
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/sched.h>
  11 #include <linux/fs.h>
  12 #include <linux/file.h>
  13 #include <linux/mm.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/mman.h>
  19 #include <linux/utsname.h>
  20 #include <linux/smp.h>
  21 #include <linux/slab.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/ipc.h>
  24 #include <linux/personality.h>
  25 #include <linux/random.h>
  26 #include <linux/module.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/utrap.h>
  30 #include <asm/perfctr.h>
  31 #include <asm/unistd.h>
  32
  33 #include "entry.h"
  34 #include "systbls.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         unsigned long (*get_area)(struct file *, unsigned long,
 321                                   unsigned long, unsigned long, unsigned long);
 322
 323         get_area = current->mm->get_unmapped_area;
 324
 325         if (flags & MAP_FIXED) {
 326                 /* Ok, don't mess with it. */
 327                 return get_area(NULL, orig_addr, len, pgoff, flags);
 328         }
 329         flags &= ~MAP_SHARED;
 330
 331         align_goal = PAGE_SIZE;
 332         if (len >= (4UL * 1024 * 1024))
 333                 align_goal = (4UL * 1024 * 1024);
 334         else if (len >= (512UL * 1024))
 335                 align_goal = (512UL * 1024);
 336         else if (len >= (64UL * 1024))
 337                 align_goal = (64UL * 1024);
 338
 339         do {
 340                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 341                 if (!(addr & ~PAGE_MASK)) {
 342                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 343                         break;
 344                 }
 345
 346                 if (align_goal == (4UL * 1024 * 1024))
 347                         align_goal = (512UL * 1024);
 348                 else if (align_goal == (512UL * 1024))
 349                         align_goal = (64UL * 1024);
 350                 else
 351                         align_goal = PAGE_SIZE;
 352         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 353
 354         /* Mapping is smaller than 64K or larger areas could not
 355          * be obtained.
 356          */
 357         if (addr & ~PAGE_MASK)
 358                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
 359
 360         return addr;
 361 }
 362 EXPORT_SYMBOL(get_fb_unmapped_area);
 363
 364 /* Essentially the same as PowerPC... */
 365 void arch_pick_mmap_layout(struct mm_struct *mm)
 366 {
 367         unsigned long random_factor = 0UL;
 368
 369         if (current->flags & PF_RANDOMIZE) {
 370                 random_factor = get_random_int();
 371                 if (test_thread_flag(TIF_32BIT))
 372                         random_factor &= ((1 * 1024 * 1024) - 1);
 373                 else
 374                         random_factor = ((random_factor << PAGE_SHIFT) &
 375                                          0xffffffffUL);
 376         }
 377
 378         /*
 379          * Fall back to the standard layout if the personality
 380          * bit is set, or if the expected stack growth is unlimited:
 381          */
 382         if (!test_thread_flag(TIF_32BIT) ||
 383             (current->personality & ADDR_COMPAT_LAYOUT) ||
 384             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 385             sysctl_legacy_va_layout) {
 386                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 387                 mm->get_unmapped_area = arch_get_unmapped_area;
 388                 mm->unmap_area = arch_unmap_area;
 389         } else {
 390                 /* We know it's 32-bit */
 391                 unsigned long task_size = STACK_TOP32;
 392                 unsigned long gap;
 393
 394                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 395                 if (gap < 128 * 1024 * 1024)
 396                         gap = 128 * 1024 * 1024;
 397                 if (gap > (task_size / 6 * 5))
 398                         gap = (task_size / 6 * 5);
 399
 400                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 401                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 402                 mm->unmap_area = arch_unmap_area_topdown;
 403         }
 404 }
 405
 406 SYSCALL_DEFINE1(sparc_brk, unsigned long, brk)
 407 {
 408         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 409         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 410                 return current->mm->brk;
 411
 412         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 413                 return current->mm->brk;
 414
 415         return sys_brk(brk);
 416 }
 417
 418 /*
 419  * sys_pipe() is the normal C calling standard for creating
 420  * a pipe. It's not the way unix traditionally does this, though.
 421  */
 422 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 423 {
 424         int fd[2];
 425         int error;
 426
 427         error = do_pipe_flags(fd, 0);
 428         if (error)
 429                 goto out;
 430         regs->u_regs[UREG_I1] = fd[1];
 431         error = fd[0];
 432 out:
 433         return error;
 434 }
 435
 436 /*
 437  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 438  *
 439  * This is really horribly ugly.
 440  */
 441
 442 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
 443                 unsigned long, third, void __user *, ptr, long, fifth)
 444 {
 445         long err;
 446
 447         /* No need for backward compatibility. We can start fresh... */
 448         if (call <= SEMCTL) {
 449                 switch (call) {
 450                 case SEMOP:
 451                         err = sys_semtimedop(first, ptr,
 452                                              (unsigned)second, NULL);
 453                         goto out;
 454                 case SEMTIMEDOP:
 455                         err = sys_semtimedop(first, ptr, (unsigned)second,
 456                                 (const struct timespec __user *)
 457                                              (unsigned long) fifth);
 458                         goto out;
 459                 case SEMGET:
 460                         err = sys_semget(first, (int)second, (int)third);
 461                         goto out;
 462                 case SEMCTL: {
 463                         err = sys_semctl(first, second,
 464                                          (int)third | IPC_64,
 465                                          (union semun) ptr);
 466                         goto out;
 467                 }
 468                 default:
 469                         err = -ENOSYS;
 470                         goto out;
 471                 };
 472         }
 473         if (call <= MSGCTL) {
 474                 switch (call) {
 475                 case MSGSND:
 476                         err = sys_msgsnd(first, ptr, (size_t)second,
 477                                          (int)third);
 478                         goto out;
 479                 case MSGRCV:
 480                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 481                                          (int)third);
 482                         goto out;
 483                 case MSGGET:
 484                         err = sys_msgget((key_t)first, (int)second);
 485                         goto out;
 486                 case MSGCTL:
 487                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 488                         goto out;
 489                 default:
 490                         err = -ENOSYS;
 491                         goto out;
 492                 };
 493         }
 494         if (call <= SHMCTL) {
 495                 switch (call) {
 496                 case SHMAT: {
 497                         ulong raddr;
 498                         err = do_shmat(first, ptr, (int)second, &raddr);
 499                         if (!err) {
 500                                 if (put_user(raddr,
 501                                              (ulong __user *) third))
 502                                         err = -EFAULT;
 503                         }
 504                         goto out;
 505                 }
 506                 case SHMDT:
 507                         err = sys_shmdt(ptr);
 508                         goto out;
 509                 case SHMGET:
 510                         err = sys_shmget(first, (size_t)second, (int)third);
 511                         goto out;
 512                 case SHMCTL:
 513                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 514                         goto out;
 515                 default:
 516                         err = -ENOSYS;
 517                         goto out;
 518                 };
 519         } else {
 520                 err = -ENOSYS;
 521         }
 522 out:
 523         return err;
 524 }
 525
 526 SYSCALL_DEFINE1(sparc64_newuname, struct new_utsname __user *, name)
 527 {
 528         int ret = sys_newuname(name);
 529
 530         if (current->personality == PER_LINUX32 && !ret) {
 531                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 532                        ? -EFAULT : 0);
 533         }
 534         return ret;
 535 }
 536
 537 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 538 {
 539         int ret;
 540
 541         if (current->personality == PER_LINUX32 &&
 542             personality == PER_LINUX)
 543                 personality = PER_LINUX32;
 544         ret = sys_personality(personality);
 545         if (ret == PER_LINUX32)
 546                 ret = PER_LINUX;
 547
 548         return ret;
 549 }
 550
 551 int sparc_mmap_check(unsigned long addr, unsigned long len)
 552 {
 553         if (test_thread_flag(TIF_32BIT)) {
 554                 if (len >= STACK_TOP32)
 555                         return -EINVAL;
 556
 557                 if (addr > STACK_TOP32 - len)
 558                         return -EINVAL;
 559         } else {
 560                 if (len >= VA_EXCLUDE_START)
 561                         return -EINVAL;
 562
 563                 if (invalid_64bit_range(addr, len))
 564                         return -EINVAL;
 565         }
 566
 567         return 0;
 568 }
 569
 570 /* Linux version of mmap */
 571 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 572                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
 573                 unsigned long, off)
 574 {
 575         unsigned long retval = -EINVAL;
 576
 577         if ((off + PAGE_ALIGN(len)) < off)
 578                 goto out;
 579         if (off & ~PAGE_MASK)
 580                 goto out;
 581         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 582 out:
 583         return retval;
 584 }
 585
 586 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 587 {
 588         long ret;
 589
 590         if (invalid_64bit_range(addr, len))
 591                 return -EINVAL;
 592
 593         down_write(&current->mm->mmap_sem);
 594         ret = do_munmap(current->mm, addr, len);
 595         up_write(&current->mm->mmap_sem);
 596         return ret;
 597 }
 598
 599 extern unsigned long do_mremap(unsigned long addr,
 600         unsigned long old_len, unsigned long new_len,
 601         unsigned long flags, unsigned long new_addr);
 602
 603 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 604                 unsigned long, new_len, unsigned long, flags,
 605                 unsigned long, new_addr)
 606 {
 607         unsigned long ret = -EINVAL;
 608
 609         if (test_thread_flag(TIF_32BIT))
 610                 goto out;
 611
 612         down_write(&current->mm->mmap_sem);
 613         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 614         up_write(&current->mm->mmap_sem);
 615 out:
 616         return ret;
 617 }
 618
 619 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 620 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 621 {
 622         static int count;
 623
 624         /* Don't make the system unusable, if someone goes stuck */
 625         if (count++ > 5)
 626                 return -ENOSYS;
 627
 628         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 629 #ifdef DEBUG_UNIMP_SYSCALL
 630         show_regs (regs);
 631 #endif
 632
 633         return -ENOSYS;
 634 }
 635
 636 /* #define DEBUG_SPARC_BREAKPOINT */
 637
 638 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 639 {
 640         siginfo_t info;
 641
 642         if (test_thread_flag(TIF_32BIT)) {
 643                 regs->tpc &= 0xffffffff;
 644                 regs->tnpc &= 0xffffffff;
 645         }
 646 #ifdef DEBUG_SPARC_BREAKPOINT
 647         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 648 #endif
 649         info.si_signo = SIGTRAP;
 650         info.si_errno = 0;
 651         info.si_code = TRAP_BRKPT;
 652         info.si_addr = (void __user *)regs->tpc;
 653         info.si_trapno = 0;
 654         force_sig_info(SIGTRAP, &info, current);
 655 #ifdef DEBUG_SPARC_BREAKPOINT
 656         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 657 #endif
 658 }
 659
 660 extern void check_pending(int signum);
 661
 662 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 663 {
 664         int nlen, err;
 665
 666         if (len < 0)
 667                 return -EINVAL;
 668
 669         down_read(&uts_sem);
 670
 671         nlen = strlen(utsname()->domainname) + 1;
 672         err = -EINVAL;
 673         if (nlen > len)
 674                 goto out;
 675
 676         err = -EFAULT;
 677         if (!copy_to_user(name, utsname()->domainname, nlen))
 678                 err = 0;
 679
 680 out:
 681         up_read(&uts_sem);
 682         return err;
 683 }
 684
 685 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 686                 utrap_handler_t, new_p, utrap_handler_t, new_d,
 687                 utrap_handler_t __user *, old_p,
 688                 utrap_handler_t __user *, old_d)
 689 {
 690         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 691                 return -EINVAL;
 692         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 693                 if (old_p) {
 694                         if (!current_thread_info()->utraps) {
 695                                 if (put_user(NULL, old_p))
 696                                         return -EFAULT;
 697                         } else {
 698                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 699                                         return -EFAULT;
 700                         }
 701                 }
 702                 if (old_d) {
 703                         if (put_user(NULL, old_d))
 704                                 return -EFAULT;
 705                 }
 706                 return 0;
 707         }
 708         if (!current_thread_info()->utraps) {
 709                 current_thread_info()->utraps =
 710                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 711                 if (!current_thread_info()->utraps)
 712                         return -ENOMEM;
 713                 current_thread_info()->utraps[0] = 1;
 714         } else {
 715                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 716                     current_thread_info()->utraps[0] > 1) {
 717                         unsigned long *p = current_thread_info()->utraps;
 718
 719                         current_thread_info()->utraps =
 720                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 721                                         GFP_KERNEL);
 722                         if (!current_thread_info()->utraps) {
 723                                 current_thread_info()->utraps = p;
 724                                 return -ENOMEM;
 725                         }
 726                         p[0]--;
 727                         current_thread_info()->utraps[0] = 1;
 728                         memcpy(current_thread_info()->utraps+1, p+1,
 729                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 730                 }
 731         }
 732         if (old_p) {
 733                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 734                         return -EFAULT;
 735         }
 736         if (old_d) {
 737                 if (put_user(NULL, old_d))
 738                         return -EFAULT;
 739         }
 740         current_thread_info()->utraps[type] = (long)new_p;
 741
 742         return 0;
 743 }
 744
 745 asmlinkage long sparc_memory_ordering(unsigned long model,
 746                                       struct pt_regs *regs)
 747 {
 748         if (model >= 3)
 749                 return -EINVAL;
 750         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 751         return 0;
 752 }
 753
 754 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 755                 struct sigaction __user *, oact, void __user *, restorer,
 756                 size_t, sigsetsize)
 757 {
 758         struct k_sigaction new_ka, old_ka;
 759         int ret;
 760
 761         /* XXX: Don't preclude handling different sized sigset_t's.  */
 762         if (sigsetsize != sizeof(sigset_t))
 763                 return -EINVAL;
 764
 765         if (act) {
 766                 new_ka.ka_restorer = restorer;
 767                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 768                         return -EFAULT;
 769         }
 770
 771         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 772
 773         if (!ret && oact) {
 774                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 775                         return -EFAULT;
 776         }
 777
 778         return ret;
 779 }
 780
 781 /* Invoked by rtrap code to update performance counters in
 782  * user space.
 783  */
 784 asmlinkage void update_perfctrs(void)
 785 {
 786         unsigned long pic, tmp;
 787
 788         read_pic(pic);
 789         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 790         __put_user(tmp, current_thread_info()->user_cntd0);
 791         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 792         __put_user(tmp, current_thread_info()->user_cntd1);
 793         reset_pic();
 794 }
 795
 796 SYSCALL_DEFINE4(perfctr, int, opcode, unsigned long, arg0,
 797                 unsigned long, arg1, unsigned long, arg2)
 798 {
 799         int err = 0;
 800
 801         switch(opcode) {
 802         case PERFCTR_ON:
 803                 current_thread_info()->pcr_reg = arg2;
 804                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 805                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 806                 current_thread_info()->kernel_cntd0 =
 807                         current_thread_info()->kernel_cntd1 = 0;
 808                 write_pcr(arg2);
 809                 reset_pic();
 810                 set_thread_flag(TIF_PERFCTR);
 811                 break;
 812
 813         case PERFCTR_OFF:
 814                 err = -EINVAL;
 815                 if (test_thread_flag(TIF_PERFCTR)) {
 816                         current_thread_info()->user_cntd0 =
 817                                 current_thread_info()->user_cntd1 = NULL;
 818                         current_thread_info()->pcr_reg = 0;
 819                         write_pcr(0);
 820                         clear_thread_flag(TIF_PERFCTR);
 821                         err = 0;
 822                 }
 823                 break;
 824
 825         case PERFCTR_READ: {
 826                 unsigned long pic, tmp;
 827
 828                 if (!test_thread_flag(TIF_PERFCTR)) {
 829                         err = -EINVAL;
 830                         break;
 831                 }
 832                 read_pic(pic);
 833                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 834                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 835                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 836                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 837                 reset_pic();
 838                 break;
 839         }
 840
 841         case PERFCTR_CLRPIC:
 842                 if (!test_thread_flag(TIF_PERFCTR)) {
 843                         err = -EINVAL;
 844                         break;
 845                 }
 846                 current_thread_info()->kernel_cntd0 =
 847                         current_thread_info()->kernel_cntd1 = 0;
 848                 reset_pic();
 849                 break;
 850
 851         case PERFCTR_SETPCR: {
 852                 u64 __user *user_pcr = (u64 __user *)arg0;
 853
 854                 if (!test_thread_flag(TIF_PERFCTR)) {
 855                         err = -EINVAL;
 856                         break;
 857                 }
 858                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 859                 write_pcr(current_thread_info()->pcr_reg);
 860                 current_thread_info()->kernel_cntd0 =
 861                         current_thread_info()->kernel_cntd1 = 0;
 862                 reset_pic();
 863                 break;
 864         }
 865
 866         case PERFCTR_GETPCR: {
 867                 u64 __user *user_pcr = (u64 __user *)arg0;
 868
 869                 if (!test_thread_flag(TIF_PERFCTR)) {
 870                         err = -EINVAL;
 871                         break;
 872                 }
 873                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 874                 break;
 875         }
 876
 877         default:
 878                 err = -EINVAL;
 879                 break;
 880         };
 881         return err;
 882 }
 883
 884 /*
 885  * Do a system call from kernel instead of calling sys_execve so we
 886  * end up with proper pt_regs.
 887  */
 888 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 889 {
 890         long __res;
 891         register long __g1 __asm__ ("g1") = __NR_execve;
 892         register long __o0 __asm__ ("o0") = (long)(filename);
 893         register long __o1 __asm__ ("o1") = (long)(argv);
 894         register long __o2 __asm__ ("o2") = (long)(envp);
 895         asm volatile ("t 0x6d\n\t"
 896                       "sub %%g0, %%o0, %0\n\t"
 897                       "movcc %%xcc, %%o0, %0\n\t"
 898                       : "=r" (__res), "=&r" (__o0)
 899                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 900                       : "cc");
 901         return __res;
 902 }