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/export.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/utrap.h>
  30 #include <asm/unistd.h>
  31
  32 #include "entry.h"
  33 #include "systbls.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, vm_start;
 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 <= vm_start_gap(vma)))
 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 (vma)
 185                         vm_start = vm_start_gap(vma);
 186                 if (likely(!vma || addr + len <= vm_start)) {
 187                         /*
 188                          * Remember the place where we stopped the search:
 189                          */
 190                         mm->free_area_cache = addr + len;
 191                         return addr;
 192                 }
 193                 if (addr + mm->cached_hole_size < vm_start)
 194                         mm->cached_hole_size = vm_start - addr;
 195
 196                 addr = vma->vm_end;
 197                 if (do_color_align)
 198                         addr = COLOUR_ALIGN(addr, pgoff);
 199         }
 200 }
 201
 202 unsigned long
 203 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 204                           const unsigned long len, const unsigned long pgoff,
 205                           const unsigned long flags)
 206 {
 207         struct vm_area_struct *vma;
 208         struct mm_struct *mm = current->mm;
 209         unsigned long task_size = STACK_TOP32;
 210         unsigned long addr = addr0, vm_start;
 211         int do_color_align;
 212
 213         /* This should only ever run for 32-bit processes.  */
 214         BUG_ON(!test_thread_flag(TIF_32BIT));
 215
 216         if (flags & MAP_FIXED) {
 217                 /* We do not accept a shared mapping if it would violate
 218                  * cache aliasing constraints.
 219                  */
 220                 if ((flags & MAP_SHARED) &&
 221                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 222                         return -EINVAL;
 223                 return addr;
 224         }
 225
 226         if (unlikely(len > task_size))
 227                 return -ENOMEM;
 228
 229         do_color_align = 0;
 230         if (filp || (flags & MAP_SHARED))
 231                 do_color_align = 1;
 232
 233         /* requesting a specific address */
 234         if (addr) {
 235                 if (do_color_align)
 236                         addr = COLOUR_ALIGN(addr, pgoff);
 237                 else
 238                         addr = PAGE_ALIGN(addr);
 239
 240                 vma = find_vma(mm, addr);
 241                 if (task_size - len >= addr &&
 242                     (!vma || addr + len <= vm_start_gap(vma)))
 243                         return addr;
 244         }
 245
 246         /* check if free_area_cache is useful for us */
 247         if (len <= mm->cached_hole_size) {
 248                 mm->cached_hole_size = 0;
 249                 mm->free_area_cache = mm->mmap_base;
 250         }
 251
 252         /* either no address requested or can't fit in requested address hole */
 253         addr = mm->free_area_cache;
 254         if (do_color_align) {
 255                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 256
 257                 addr = base + len;
 258         }
 259
 260         /* make sure it can fit in the remaining address space */
 261         if (likely(addr > len)) {
 262                 vma = find_vma(mm, addr-len);
 263                 if (!vma || addr <= vm_start_gap(vma)) {
 264                         /* remember the address as a hint for next time */
 265                         return (mm->free_area_cache = addr-len);
 266                 }
 267         }
 268
 269         if (unlikely(mm->mmap_base < len))
 270                 goto bottomup;
 271
 272         addr = mm->mmap_base-len;
 273         if (do_color_align)
 274                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 275
 276         do {
 277                 /*
 278                  * Lookup failure means no vma is above this address,
 279                  * else if new region fits below vma->vm_start,
 280                  * return with success:
 281                  */
 282                 vma = find_vma(mm, addr);
 283                 if (vma)
 284                         vm_start = vm_start_gap(vma);
 285                 if (likely(!vma || addr + len <= vm_start)) {
 286                         /* remember the address as a hint for next time */
 287                         return (mm->free_area_cache = addr);
 288                 }
 289
 290                 /* remember the largest hole we saw so far */
 291                 if (addr + mm->cached_hole_size < vm_start)
 292                         mm->cached_hole_size = vm_start - addr;
 293
 294                 /* try just below the current vma->vm_start */
 295                 addr = vm_start - len;
 296                 if (do_color_align)
 297                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 298         } while (likely(len < vm_start));
 299
 300 bottomup:
 301         /*
 302          * A failed mmap() very likely causes application failure,
 303          * so fall back to the bottom-up function here. This scenario
 304          * can happen with large stack limits and large mmap()
 305          * allocations.
 306          */
 307         mm->cached_hole_size = ~0UL;
 308         mm->free_area_cache = TASK_UNMAPPED_BASE;
 309         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 310         /*
 311          * Restore the topdown base:
 312          */
 313         mm->free_area_cache = mm->mmap_base;
 314         mm->cached_hole_size = ~0UL;
 315
 316         return addr;
 317 }
 318
 319 /* Try to align mapping such that we align it as much as possible. */
 320 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 321 {
 322         unsigned long align_goal, addr = -ENOMEM;
 323         unsigned long (*get_area)(struct file *, unsigned long,
 324                                   unsigned long, unsigned long, unsigned long);
 325
 326         get_area = current->mm->get_unmapped_area;
 327
 328         if (flags & MAP_FIXED) {
 329                 /* Ok, don't mess with it. */
 330                 return get_area(NULL, orig_addr, len, pgoff, flags);
 331         }
 332         flags &= ~MAP_SHARED;
 333
 334         align_goal = PAGE_SIZE;
 335         if (len >= (4UL * 1024 * 1024))
 336                 align_goal = (4UL * 1024 * 1024);
 337         else if (len >= (512UL * 1024))
 338                 align_goal = (512UL * 1024);
 339         else if (len >= (64UL * 1024))
 340                 align_goal = (64UL * 1024);
 341
 342         do {
 343                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 344                 if (!(addr & ~PAGE_MASK)) {
 345                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 346                         break;
 347                 }
 348
 349                 if (align_goal == (4UL * 1024 * 1024))
 350                         align_goal = (512UL * 1024);
 351                 else if (align_goal == (512UL * 1024))
 352                         align_goal = (64UL * 1024);
 353                 else
 354                         align_goal = PAGE_SIZE;
 355         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 356
 357         /* Mapping is smaller than 64K or larger areas could not
 358          * be obtained.
 359          */
 360         if (addr & ~PAGE_MASK)
 361                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
 362
 363         return addr;
 364 }
 365 EXPORT_SYMBOL(get_fb_unmapped_area);
 366
 367 /* Essentially the same as PowerPC.  */
 368 static unsigned long mmap_rnd(void)
 369 {
 370         unsigned long rnd = 0UL;
 371
 372         if (current->flags & PF_RANDOMIZE) {
 373                 unsigned long val = get_random_int();
 374                 if (test_thread_flag(TIF_32BIT))
 375                         rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
 376                 else
 377                         rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
 378         }
 379         return rnd << PAGE_SHIFT;
 380 }
 381
 382 void arch_pick_mmap_layout(struct mm_struct *mm)
 383 {
 384         unsigned long random_factor = mmap_rnd();
 385         unsigned long gap;
 386
 387         /*
 388          * Fall back to the standard layout if the personality
 389          * bit is set, or if the expected stack growth is unlimited:
 390          */
 391         gap = rlimit(RLIMIT_STACK);
 392         if (!test_thread_flag(TIF_32BIT) ||
 393             (current->personality & ADDR_COMPAT_LAYOUT) ||
 394             gap == RLIM_INFINITY ||
 395             sysctl_legacy_va_layout) {
 396                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 397                 mm->get_unmapped_area = arch_get_unmapped_area;
 398                 mm->unmap_area = arch_unmap_area;
 399         } else {
 400                 /* We know it's 32-bit */
 401                 unsigned long task_size = STACK_TOP32;
 402
 403                 if (gap < 128 * 1024 * 1024)
 404                         gap = 128 * 1024 * 1024;
 405                 if (gap > (task_size / 6 * 5))
 406                         gap = (task_size / 6 * 5);
 407
 408                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 409                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 410                 mm->unmap_area = arch_unmap_area_topdown;
 411         }
 412 }
 413
 414 /*
 415  * sys_pipe() is the normal C calling standard for creating
 416  * a pipe. It's not the way unix traditionally does this, though.
 417  */
 418 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 419 {
 420         int fd[2];
 421         int error;
 422
 423         error = do_pipe_flags(fd, 0);
 424         if (error)
 425                 goto out;
 426         regs->u_regs[UREG_I1] = fd[1];
 427         error = fd[0];
 428 out:
 429         return error;
 430 }
 431
 432 /*
 433  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 434  *
 435  * This is really horribly ugly.
 436  */
 437
 438 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 439                 unsigned long, third, void __user *, ptr, long, fifth)
 440 {
 441         long err;
 442
 443         /* No need for backward compatibility. We can start fresh... */
 444         if (call <= SEMCTL) {
 445                 switch (call) {
 446                 case SEMOP:
 447                         err = sys_semtimedop(first, ptr,
 448                                              (unsigned)second, NULL);
 449                         goto out;
 450                 case SEMTIMEDOP:
 451                         err = sys_semtimedop(first, ptr, (unsigned)second,
 452                                 (const struct timespec __user *)
 453                                              (unsigned long) fifth);
 454                         goto out;
 455                 case SEMGET:
 456                         err = sys_semget(first, (int)second, (int)third);
 457                         goto out;
 458                 case SEMCTL: {
 459                         err = sys_semctl(first, second,
 460                                          (int)third | IPC_64,
 461                                          (union semun) ptr);
 462                         goto out;
 463                 }
 464                 default:
 465                         err = -ENOSYS;
 466                         goto out;
 467                 }
 468         }
 469         if (call <= MSGCTL) {
 470                 switch (call) {
 471                 case MSGSND:
 472                         err = sys_msgsnd(first, ptr, (size_t)second,
 473                                          (int)third);
 474                         goto out;
 475                 case MSGRCV:
 476                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 477                                          (int)third);
 478                         goto out;
 479                 case MSGGET:
 480                         err = sys_msgget((key_t)first, (int)second);
 481                         goto out;
 482                 case MSGCTL:
 483                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 484                         goto out;
 485                 default:
 486                         err = -ENOSYS;
 487                         goto out;
 488                 }
 489         }
 490         if (call <= SHMCTL) {
 491                 switch (call) {
 492                 case SHMAT: {
 493                         ulong raddr;
 494                         err = do_shmat(first, ptr, (int)second, &raddr);
 495                         if (!err) {
 496                                 if (put_user(raddr,
 497                                              (ulong __user *) third))
 498                                         err = -EFAULT;
 499                         }
 500                         goto out;
 501                 }
 502                 case SHMDT:
 503                         err = sys_shmdt(ptr);
 504                         goto out;
 505                 case SHMGET:
 506                         err = sys_shmget(first, (size_t)second, (int)third);
 507                         goto out;
 508                 case SHMCTL:
 509                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 510                         goto out;
 511                 default:
 512                         err = -ENOSYS;
 513                         goto out;
 514                 }
 515         } else {
 516                 err = -ENOSYS;
 517         }
 518 out:
 519         return err;
 520 }
 521
 522 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 523 {
 524         long ret;
 525
 526         if (personality(current->personality) == PER_LINUX32 &&
 527             personality(personality) == PER_LINUX)
 528                 personality |= PER_LINUX32;
 529         ret = sys_personality(personality);
 530         if (personality(ret) == PER_LINUX32)
 531                 ret &= ~PER_LINUX32;
 532
 533         return ret;
 534 }
 535
 536 int sparc_mmap_check(unsigned long addr, unsigned long len)
 537 {
 538         if (test_thread_flag(TIF_32BIT)) {
 539                 if (len >= STACK_TOP32)
 540                         return -EINVAL;
 541
 542                 if (addr > STACK_TOP32 - len)
 543                         return -EINVAL;
 544         } else {
 545                 if (len >= VA_EXCLUDE_START)
 546                         return -EINVAL;
 547
 548                 if (invalid_64bit_range(addr, len))
 549                         return -EINVAL;
 550         }
 551
 552         return 0;
 553 }
 554
 555 /* Linux version of mmap */
 556 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 557                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
 558                 unsigned long, off)
 559 {
 560         unsigned long retval = -EINVAL;
 561
 562         if ((off + PAGE_ALIGN(len)) < off)
 563                 goto out;
 564         if (off & ~PAGE_MASK)
 565                 goto out;
 566         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 567 out:
 568         return retval;
 569 }
 570
 571 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 572 {
 573         long ret;
 574
 575         if (invalid_64bit_range(addr, len))
 576                 return -EINVAL;
 577
 578         down_write(&current->mm->mmap_sem);
 579         ret = do_munmap(current->mm, addr, len);
 580         up_write(&current->mm->mmap_sem);
 581         return ret;
 582 }
 583
 584 extern unsigned long do_mremap(unsigned long addr,
 585         unsigned long old_len, unsigned long new_len,
 586         unsigned long flags, unsigned long new_addr);
 587
 588 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 589                 unsigned long, new_len, unsigned long, flags,
 590                 unsigned long, new_addr)
 591 {
 592         unsigned long ret = -EINVAL;
 593
 594         if (test_thread_flag(TIF_32BIT))
 595                 goto out;
 596
 597         down_write(&current->mm->mmap_sem);
 598         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 599         up_write(&current->mm->mmap_sem);
 600 out:
 601         return ret;
 602 }
 603
 604 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 605 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 606 {
 607         static int count;
 608
 609         /* Don't make the system unusable, if someone goes stuck */
 610         if (count++ > 5)
 611                 return -ENOSYS;
 612
 613         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 614 #ifdef DEBUG_UNIMP_SYSCALL
 615         show_regs (regs);
 616 #endif
 617
 618         return -ENOSYS;
 619 }
 620
 621 /* #define DEBUG_SPARC_BREAKPOINT */
 622
 623 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 624 {
 625         siginfo_t info;
 626
 627         if (test_thread_flag(TIF_32BIT)) {
 628                 regs->tpc &= 0xffffffff;
 629                 regs->tnpc &= 0xffffffff;
 630         }
 631 #ifdef DEBUG_SPARC_BREAKPOINT
 632         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 633 #endif
 634         info.si_signo = SIGTRAP;
 635         info.si_errno = 0;
 636         info.si_code = TRAP_BRKPT;
 637         info.si_addr = (void __user *)regs->tpc;
 638         info.si_trapno = 0;
 639         force_sig_info(SIGTRAP, &info, current);
 640 #ifdef DEBUG_SPARC_BREAKPOINT
 641         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 642 #endif
 643 }
 644
 645 extern void check_pending(int signum);
 646
 647 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 648 {
 649         int nlen, err;
 650
 651         if (len < 0)
 652                 return -EINVAL;
 653
 654         down_read(&uts_sem);
 655
 656         nlen = strlen(utsname()->domainname) + 1;
 657         err = -EINVAL;
 658         if (nlen > len)
 659                 goto out;
 660
 661         err = -EFAULT;
 662         if (!copy_to_user(name, utsname()->domainname, nlen))
 663                 err = 0;
 664
 665 out:
 666         up_read(&uts_sem);
 667         return err;
 668 }
 669
 670 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 671                 utrap_handler_t, new_p, utrap_handler_t, new_d,
 672                 utrap_handler_t __user *, old_p,
 673                 utrap_handler_t __user *, old_d)
 674 {
 675         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 676                 return -EINVAL;
 677         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 678                 if (old_p) {
 679                         if (!current_thread_info()->utraps) {
 680                                 if (put_user(NULL, old_p))
 681                                         return -EFAULT;
 682                         } else {
 683                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 684                                         return -EFAULT;
 685                         }
 686                 }
 687                 if (old_d) {
 688                         if (put_user(NULL, old_d))
 689                                 return -EFAULT;
 690                 }
 691                 return 0;
 692         }
 693         if (!current_thread_info()->utraps) {
 694                 current_thread_info()->utraps =
 695                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 696                 if (!current_thread_info()->utraps)
 697                         return -ENOMEM;
 698                 current_thread_info()->utraps[0] = 1;
 699         } else {
 700                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 701                     current_thread_info()->utraps[0] > 1) {
 702                         unsigned long *p = current_thread_info()->utraps;
 703
 704                         current_thread_info()->utraps =
 705                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 706                                         GFP_KERNEL);
 707                         if (!current_thread_info()->utraps) {
 708                                 current_thread_info()->utraps = p;
 709                                 return -ENOMEM;
 710                         }
 711                         p[0]--;
 712                         current_thread_info()->utraps[0] = 1;
 713                         memcpy(current_thread_info()->utraps+1, p+1,
 714                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 715                 }
 716         }
 717         if (old_p) {
 718                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 719                         return -EFAULT;
 720         }
 721         if (old_d) {
 722                 if (put_user(NULL, old_d))
 723                         return -EFAULT;
 724         }
 725         current_thread_info()->utraps[type] = (long)new_p;
 726
 727         return 0;
 728 }
 729
 730 asmlinkage long sparc_memory_ordering(unsigned long model,
 731                                       struct pt_regs *regs)
 732 {
 733         if (model >= 3)
 734                 return -EINVAL;
 735         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 736         return 0;
 737 }
 738
 739 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 740                 struct sigaction __user *, oact, void __user *, restorer,
 741                 size_t, sigsetsize)
 742 {
 743         struct k_sigaction new_ka, old_ka;
 744         int ret;
 745
 746         /* XXX: Don't preclude handling different sized sigset_t's.  */
 747         if (sigsetsize != sizeof(sigset_t))
 748                 return -EINVAL;
 749
 750         if (act) {
 751                 new_ka.ka_restorer = restorer;
 752                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 753                         return -EFAULT;
 754         }
 755
 756         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 757
 758         if (!ret && oact) {
 759                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 760                         return -EFAULT;
 761         }
 762
 763         return ret;
 764 }
 765
 766 /*
 767  * Do a system call from kernel instead of calling sys_execve so we
 768  * end up with proper pt_regs.
 769  */
 770 int kernel_execve(const char *filename,
 771                   const char *const argv[],
 772                   const char *const envp[])
 773 {
 774         long __res;
 775         register long __g1 __asm__ ("g1") = __NR_execve;
 776         register long __o0 __asm__ ("o0") = (long)(filename);
 777         register long __o1 __asm__ ("o1") = (long)(argv);
 778         register long __o2 __asm__ ("o2") = (long)(envp);
 779         asm volatile ("t 0x6d\n\t"
 780                       "sub %%g0, %%o0, %0\n\t"
 781                       "movcc %%xcc, %%o0, %0\n\t"
 782                       : "=r" (__res), "=&r" (__o0)
 783                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 784                       : "cc");
 785         return __res;
 786 }