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;
 121         int do_color_align;
 122
 123         if (flags & MAP_FIXED) {
 124                 /* We do not accept a shared mapping if it would violate
 125                  * cache aliasing constraints.
 126                  */
 127                 if ((flags & MAP_SHARED) &&
 128                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 129                         return -EINVAL;
 130                 return addr;
 131         }
 132
 133         if (test_thread_flag(TIF_32BIT))
 134                 task_size = STACK_TOP32;
 135         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 136                 return -ENOMEM;
 137
 138         do_color_align = 0;
 139         if (filp || (flags & MAP_SHARED))
 140                 do_color_align = 1;
 141
 142         if (addr) {
 143                 if (do_color_align)
 144                         addr = COLOUR_ALIGN(addr, pgoff);
 145                 else
 146                         addr = PAGE_ALIGN(addr);
 147
 148                 vma = find_vma(mm, addr);
 149                 if (task_size - len >= addr &&
 150                     (!vma || addr + len <= vma->vm_start))
 151                         return addr;
 152         }
 153
 154         if (len > mm->cached_hole_size) {
 155                 start_addr = addr = mm->free_area_cache;
 156         } else {
 157                 start_addr = addr = TASK_UNMAPPED_BASE;
 158                 mm->cached_hole_size = 0;
 159         }
 160
 161         task_size -= len;
 162
 163 full_search:
 164         if (do_color_align)
 165                 addr = COLOUR_ALIGN(addr, pgoff);
 166         else
 167                 addr = PAGE_ALIGN(addr);
 168
 169         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 170                 /* At this point:  (!vma || addr < vma->vm_end). */
 171                 if (addr < VA_EXCLUDE_START &&
 172                     (addr + len) >= VA_EXCLUDE_START) {
 173                         addr = VA_EXCLUDE_END;
 174                         vma = find_vma(mm, VA_EXCLUDE_END);
 175                 }
 176                 if (unlikely(task_size < addr)) {
 177                         if (start_addr != TASK_UNMAPPED_BASE) {
 178                                 start_addr = addr = TASK_UNMAPPED_BASE;
 179                                 mm->cached_hole_size = 0;
 180                                 goto full_search;
 181                         }
 182                         return -ENOMEM;
 183                 }
 184                 if (likely(!vma || addr + len <= vma->vm_start)) {
 185                         /*
 186                          * Remember the place where we stopped the search:
 187                          */
 188                         mm->free_area_cache = addr + len;
 189                         return addr;
 190                 }
 191                 if (addr + mm->cached_hole_size < vma->vm_start)
 192                         mm->cached_hole_size = vma->vm_start - addr;
 193
 194                 addr = vma->vm_end;
 195                 if (do_color_align)
 196                         addr = COLOUR_ALIGN(addr, pgoff);
 197         }
 198 }
 199
 200 unsigned long
 201 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 202                           const unsigned long len, const unsigned long pgoff,
 203                           const unsigned long flags)
 204 {
 205         struct vm_area_struct *vma;
 206         struct mm_struct *mm = current->mm;
 207         unsigned long task_size = STACK_TOP32;
 208         unsigned long addr = addr0;
 209         int do_color_align;
 210
 211         /* This should only ever run for 32-bit processes.  */
 212         BUG_ON(!test_thread_flag(TIF_32BIT));
 213
 214         if (flags & MAP_FIXED) {
 215                 /* We do not accept a shared mapping if it would violate
 216                  * cache aliasing constraints.
 217                  */
 218                 if ((flags & MAP_SHARED) &&
 219                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 220                         return -EINVAL;
 221                 return addr;
 222         }
 223
 224         if (unlikely(len > task_size))
 225                 return -ENOMEM;
 226
 227         do_color_align = 0;
 228         if (filp || (flags & MAP_SHARED))
 229                 do_color_align = 1;
 230
 231         /* requesting a specific address */
 232         if (addr) {
 233                 if (do_color_align)
 234                         addr = COLOUR_ALIGN(addr, pgoff);
 235                 else
 236                         addr = PAGE_ALIGN(addr);
 237
 238                 vma = find_vma(mm, addr);
 239                 if (task_size - len >= addr &&
 240                     (!vma || addr + len <= vma->vm_start))
 241                         return addr;
 242         }
 243
 244         /* check if free_area_cache is useful for us */
 245         if (len <= mm->cached_hole_size) {
 246                 mm->cached_hole_size = 0;
 247                 mm->free_area_cache = mm->mmap_base;
 248         }
 249
 250         /* either no address requested or can't fit in requested address hole */
 251         addr = mm->free_area_cache;
 252         if (do_color_align) {
 253                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 254
 255                 addr = base + len;
 256         }
 257
 258         /* make sure it can fit in the remaining address space */
 259         if (likely(addr > len)) {
 260                 vma = find_vma(mm, addr-len);
 261                 if (!vma || addr <= vma->vm_start) {
 262                         /* remember the address as a hint for next time */
 263                         return (mm->free_area_cache = addr-len);
 264                 }
 265         }
 266
 267         if (unlikely(mm->mmap_base < len))
 268                 goto bottomup;
 269
 270         addr = mm->mmap_base-len;
 271         if (do_color_align)
 272                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 273
 274         do {
 275                 /*
 276                  * Lookup failure means no vma is above this address,
 277                  * else if new region fits below vma->vm_start,
 278                  * return with success:
 279                  */
 280                 vma = find_vma(mm, addr);
 281                 if (likely(!vma || addr+len <= vma->vm_start)) {
 282                         /* remember the address as a hint for next time */
 283                         return (mm->free_area_cache = addr);
 284                 }
 285
 286                 /* remember the largest hole we saw so far */
 287                 if (addr + mm->cached_hole_size < vma->vm_start)
 288                         mm->cached_hole_size = vma->vm_start - addr;
 289
 290                 /* try just below the current vma->vm_start */
 291                 addr = vma->vm_start-len;
 292                 if (do_color_align)
 293                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 294         } while (likely(len < vma->vm_start));
 295
 296 bottomup:
 297         /*
 298          * A failed mmap() very likely causes application failure,
 299          * so fall back to the bottom-up function here. This scenario
 300          * can happen with large stack limits and large mmap()
 301          * allocations.
 302          */
 303         mm->cached_hole_size = ~0UL;
 304         mm->free_area_cache = TASK_UNMAPPED_BASE;
 305         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 306         /*
 307          * Restore the topdown base:
 308          */
 309         mm->free_area_cache = mm->mmap_base;
 310         mm->cached_hole_size = ~0UL;
 311
 312         return addr;
 313 }
 314
 315 /* Try to align mapping such that we align it as much as possible. */
 316 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 317 {
 318         unsigned long align_goal, addr = -ENOMEM;
 319         unsigned long (*get_area)(struct file *, unsigned long,
 320                                   unsigned long, unsigned long, unsigned long);
 321
 322         get_area = current->mm->get_unmapped_area;
 323
 324         if (flags & MAP_FIXED) {
 325                 /* Ok, don't mess with it. */
 326                 return get_area(NULL, orig_addr, len, pgoff, flags);
 327         }
 328         flags &= ~MAP_SHARED;
 329
 330         align_goal = PAGE_SIZE;
 331         if (len >= (4UL * 1024 * 1024))
 332                 align_goal = (4UL * 1024 * 1024);
 333         else if (len >= (512UL * 1024))
 334                 align_goal = (512UL * 1024);
 335         else if (len >= (64UL * 1024))
 336                 align_goal = (64UL * 1024);
 337
 338         do {
 339                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 340                 if (!(addr & ~PAGE_MASK)) {
 341                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 342                         break;
 343                 }
 344
 345                 if (align_goal == (4UL * 1024 * 1024))
 346                         align_goal = (512UL * 1024);
 347                 else if (align_goal == (512UL * 1024))
 348                         align_goal = (64UL * 1024);
 349                 else
 350                         align_goal = PAGE_SIZE;
 351         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 352
 353         /* Mapping is smaller than 64K or larger areas could not
 354          * be obtained.
 355          */
 356         if (addr & ~PAGE_MASK)
 357                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
 358
 359         return addr;
 360 }
 361 EXPORT_SYMBOL(get_fb_unmapped_area);
 362
 363 /* Essentially the same as PowerPC.  */
 364 static unsigned long mmap_rnd(void)
 365 {
 366         unsigned long rnd = 0UL;
 367
 368         if (current->flags & PF_RANDOMIZE) {
 369                 unsigned long val = get_random_int();
 370                 if (test_thread_flag(TIF_32BIT))
 371                         rnd = (val % (1UL << (22UL-PAGE_SHIFT)));
 372                 else
 373                         rnd = (val % (1UL << (29UL-PAGE_SHIFT)));
 374         }
 375         return (rnd << PAGE_SHIFT) * 2;
 376 }
 377
 378 void arch_pick_mmap_layout(struct mm_struct *mm)
 379 {
 380         unsigned long random_factor = mmap_rnd();
 381         unsigned long gap;
 382
 383         /*
 384          * Fall back to the standard layout if the personality
 385          * bit is set, or if the expected stack growth is unlimited:
 386          */
 387         gap = rlimit(RLIMIT_STACK);
 388         if (!test_thread_flag(TIF_32BIT) ||
 389             (current->personality & ADDR_COMPAT_LAYOUT) ||
 390             gap == RLIM_INFINITY ||
 391             sysctl_legacy_va_layout) {
 392                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 393                 mm->get_unmapped_area = arch_get_unmapped_area;
 394                 mm->unmap_area = arch_unmap_area;
 395         } else {
 396                 /* We know it's 32-bit */
 397                 unsigned long task_size = STACK_TOP32;
 398
 399                 if (gap < 128 * 1024 * 1024)
 400                         gap = 128 * 1024 * 1024;
 401                 if (gap > (task_size / 6 * 5))
 402                         gap = (task_size / 6 * 5);
 403
 404                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 405                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 406                 mm->unmap_area = arch_unmap_area_topdown;
 407         }
 408 }
 409
 410 /*
 411  * sys_pipe() is the normal C calling standard for creating
 412  * a pipe. It's not the way unix traditionally does this, though.
 413  */
 414 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 415 {
 416         int fd[2];
 417         int error;
 418
 419         error = do_pipe_flags(fd, 0);
 420         if (error)
 421                 goto out;
 422         regs->u_regs[UREG_I1] = fd[1];
 423         error = fd[0];
 424 out:
 425         return error;
 426 }
 427
 428 /*
 429  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 430  *
 431  * This is really horribly ugly.
 432  */
 433
 434 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 435                 unsigned long, third, void __user *, ptr, long, fifth)
 436 {
 437         long err;
 438
 439         /* No need for backward compatibility. We can start fresh... */
 440         if (call <= SEMCTL) {
 441                 switch (call) {
 442                 case SEMOP:
 443                         err = sys_semtimedop(first, ptr,
 444                                              (unsigned)second, NULL);
 445                         goto out;
 446                 case SEMTIMEDOP:
 447                         err = sys_semtimedop(first, ptr, (unsigned)second,
 448                                 (const struct timespec __user *)
 449                                              (unsigned long) fifth);
 450                         goto out;
 451                 case SEMGET:
 452                         err = sys_semget(first, (int)second, (int)third);
 453                         goto out;
 454                 case SEMCTL: {
 455                         err = sys_semctl(first, second,
 456                                          (int)third | IPC_64,
 457                                          (union semun) ptr);
 458                         goto out;
 459                 }
 460                 default:
 461                         err = -ENOSYS;
 462                         goto out;
 463                 }
 464         }
 465         if (call <= MSGCTL) {
 466                 switch (call) {
 467                 case MSGSND:
 468                         err = sys_msgsnd(first, ptr, (size_t)second,
 469                                          (int)third);
 470                         goto out;
 471                 case MSGRCV:
 472                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 473                                          (int)third);
 474                         goto out;
 475                 case MSGGET:
 476                         err = sys_msgget((key_t)first, (int)second);
 477                         goto out;
 478                 case MSGCTL:
 479                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 480                         goto out;
 481                 default:
 482                         err = -ENOSYS;
 483                         goto out;
 484                 }
 485         }
 486         if (call <= SHMCTL) {
 487                 switch (call) {
 488                 case SHMAT: {
 489                         ulong raddr;
 490                         err = do_shmat(first, ptr, (int)second, &raddr);
 491                         if (!err) {
 492                                 if (put_user(raddr,
 493                                              (ulong __user *) third))
 494                                         err = -EFAULT;
 495                         }
 496                         goto out;
 497                 }
 498                 case SHMDT:
 499                         err = sys_shmdt(ptr);
 500                         goto out;
 501                 case SHMGET:
 502                         err = sys_shmget(first, (size_t)second, (int)third);
 503                         goto out;
 504                 case SHMCTL:
 505                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 506                         goto out;
 507                 default:
 508                         err = -ENOSYS;
 509                         goto out;
 510                 }
 511         } else {
 512                 err = -ENOSYS;
 513         }
 514 out:
 515         return err;
 516 }
 517
 518 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 519 {
 520         int ret;
 521
 522         if (current->personality == PER_LINUX32 &&
 523             personality == PER_LINUX)
 524                 personality = PER_LINUX32;
 525         ret = sys_personality(personality);
 526         if (ret == PER_LINUX32)
 527                 ret = PER_LINUX;
 528
 529         return ret;
 530 }
 531
 532 int sparc_mmap_check(unsigned long addr, unsigned long len)
 533 {
 534         if (test_thread_flag(TIF_32BIT)) {
 535                 if (len >= STACK_TOP32)
 536                         return -EINVAL;
 537
 538                 if (addr > STACK_TOP32 - len)
 539                         return -EINVAL;
 540         } else {
 541                 if (len >= VA_EXCLUDE_START)
 542                         return -EINVAL;
 543
 544                 if (invalid_64bit_range(addr, len))
 545                         return -EINVAL;
 546         }
 547
 548         return 0;
 549 }
 550
 551 /* Linux version of mmap */
 552 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 553                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
 554                 unsigned long, off)
 555 {
 556         unsigned long retval = -EINVAL;
 557
 558         if ((off + PAGE_ALIGN(len)) < off)
 559                 goto out;
 560         if (off & ~PAGE_MASK)
 561                 goto out;
 562         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 563 out:
 564         return retval;
 565 }
 566
 567 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 568 {
 569         long ret;
 570
 571         if (invalid_64bit_range(addr, len))
 572                 return -EINVAL;
 573
 574         down_write(&current->mm->mmap_sem);
 575         ret = do_munmap(current->mm, addr, len);
 576         up_write(&current->mm->mmap_sem);
 577         return ret;
 578 }
 579
 580 extern unsigned long do_mremap(unsigned long addr,
 581         unsigned long old_len, unsigned long new_len,
 582         unsigned long flags, unsigned long new_addr);
 583
 584 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 585                 unsigned long, new_len, unsigned long, flags,
 586                 unsigned long, new_addr)
 587 {
 588         unsigned long ret = -EINVAL;
 589
 590         if (test_thread_flag(TIF_32BIT))
 591                 goto out;
 592
 593         down_write(&current->mm->mmap_sem);
 594         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 595         up_write(&current->mm->mmap_sem);
 596 out:
 597         return ret;
 598 }
 599
 600 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 601 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 602 {
 603         static int count;
 604
 605         /* Don't make the system unusable, if someone goes stuck */
 606         if (count++ > 5)
 607                 return -ENOSYS;
 608
 609         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 610 #ifdef DEBUG_UNIMP_SYSCALL
 611         show_regs (regs);
 612 #endif
 613
 614         return -ENOSYS;
 615 }
 616
 617 /* #define DEBUG_SPARC_BREAKPOINT */
 618
 619 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 620 {
 621         siginfo_t info;
 622
 623         if (test_thread_flag(TIF_32BIT)) {
 624                 regs->tpc &= 0xffffffff;
 625                 regs->tnpc &= 0xffffffff;
 626         }
 627 #ifdef DEBUG_SPARC_BREAKPOINT
 628         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 629 #endif
 630         info.si_signo = SIGTRAP;
 631         info.si_errno = 0;
 632         info.si_code = TRAP_BRKPT;
 633         info.si_addr = (void __user *)regs->tpc;
 634         info.si_trapno = 0;
 635         force_sig_info(SIGTRAP, &info, current);
 636 #ifdef DEBUG_SPARC_BREAKPOINT
 637         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 638 #endif
 639 }
 640
 641 extern void check_pending(int signum);
 642
 643 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 644 {
 645         int nlen, err;
 646
 647         if (len < 0)
 648                 return -EINVAL;
 649
 650         down_read(&uts_sem);
 651
 652         nlen = strlen(utsname()->domainname) + 1;
 653         err = -EINVAL;
 654         if (nlen > len)
 655                 goto out;
 656
 657         err = -EFAULT;
 658         if (!copy_to_user(name, utsname()->domainname, nlen))
 659                 err = 0;
 660
 661 out:
 662         up_read(&uts_sem);
 663         return err;
 664 }
 665
 666 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 667                 utrap_handler_t, new_p, utrap_handler_t, new_d,
 668                 utrap_handler_t __user *, old_p,
 669                 utrap_handler_t __user *, old_d)
 670 {
 671         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 672                 return -EINVAL;
 673         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 674                 if (old_p) {
 675                         if (!current_thread_info()->utraps) {
 676                                 if (put_user(NULL, old_p))
 677                                         return -EFAULT;
 678                         } else {
 679                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 680                                         return -EFAULT;
 681                         }
 682                 }
 683                 if (old_d) {
 684                         if (put_user(NULL, old_d))
 685                                 return -EFAULT;
 686                 }
 687                 return 0;
 688         }
 689         if (!current_thread_info()->utraps) {
 690                 current_thread_info()->utraps =
 691                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 692                 if (!current_thread_info()->utraps)
 693                         return -ENOMEM;
 694                 current_thread_info()->utraps[0] = 1;
 695         } else {
 696                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 697                     current_thread_info()->utraps[0] > 1) {
 698                         unsigned long *p = current_thread_info()->utraps;
 699
 700                         current_thread_info()->utraps =
 701                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 702                                         GFP_KERNEL);
 703                         if (!current_thread_info()->utraps) {
 704                                 current_thread_info()->utraps = p;
 705                                 return -ENOMEM;
 706                         }
 707                         p[0]--;
 708                         current_thread_info()->utraps[0] = 1;
 709                         memcpy(current_thread_info()->utraps+1, p+1,
 710                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 711                 }
 712         }
 713         if (old_p) {
 714                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 715                         return -EFAULT;
 716         }
 717         if (old_d) {
 718                 if (put_user(NULL, old_d))
 719                         return -EFAULT;
 720         }
 721         current_thread_info()->utraps[type] = (long)new_p;
 722
 723         return 0;
 724 }
 725
 726 asmlinkage long sparc_memory_ordering(unsigned long model,
 727                                       struct pt_regs *regs)
 728 {
 729         if (model >= 3)
 730                 return -EINVAL;
 731         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 732         return 0;
 733 }
 734
 735 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 736                 struct sigaction __user *, oact, void __user *, restorer,
 737                 size_t, sigsetsize)
 738 {
 739         struct k_sigaction new_ka, old_ka;
 740         int ret;
 741
 742         /* XXX: Don't preclude handling different sized sigset_t's.  */
 743         if (sigsetsize != sizeof(sigset_t))
 744                 return -EINVAL;
 745
 746         if (act) {
 747                 new_ka.ka_restorer = restorer;
 748                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 749                         return -EFAULT;
 750         }
 751
 752         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 753
 754         if (!ret && oact) {
 755                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 756                         return -EFAULT;
 757         }
 758
 759         return ret;
 760 }
 761
 762 /*
 763  * Do a system call from kernel instead of calling sys_execve so we
 764  * end up with proper pt_regs.
 765  */
 766 int kernel_execve(const char *filename,
 767                   const char *const argv[],
 768                   const char *const envp[])
 769 {
 770         long __res;
 771         register long __g1 __asm__ ("g1") = __NR_execve;
 772         register long __o0 __asm__ ("o0") = (long)(filename);
 773         register long __o1 __asm__ ("o1") = (long)(argv);
 774         register long __o2 __asm__ ("o2") = (long)(envp);
 775         asm volatile ("t 0x6d\n\t"
 776                       "sub %%g0, %%o0, %0\n\t"
 777                       "movcc %%xcc, %%o0, %0\n\t"
 778                       : "=r" (__res), "=&r" (__o0)
 779                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 780                       : "cc");
 781         return __res;
 782 }