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 /* These functions differ from the default implementations in
  70  * mm/mmap.c in two ways:
  71  *
  72  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  73  *    for fixed such mappings we just validate what the user gave us.
  74  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  75  *    the spitfire/niagara VA-hole.
  76  */
  77
  78 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  79                                          unsigned long pgoff)
  80 {
  81         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  82         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  83
  84         return base + off;
  85 }
  86
  87 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
  88                                               unsigned long pgoff)
  89 {
  90         unsigned long base = addr & ~(SHMLBA-1);
  91         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  92
  93         if (base + off <= addr)
  94                 return base + off;
  95         return base - off;
  96 }
  97
  98 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  99 {
 100         struct mm_struct *mm = current->mm;
 101         struct vm_area_struct * vma;
 102         unsigned long task_size = TASK_SIZE;
 103         unsigned long start_addr;
 104         int do_color_align;
 105
 106         if (flags & MAP_FIXED) {
 107                 /* We do not accept a shared mapping if it would violate
 108                  * cache aliasing constraints.
 109                  */
 110                 if ((flags & MAP_SHARED) &&
 111                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 112                         return -EINVAL;
 113                 return addr;
 114         }
 115
 116         if (test_thread_flag(TIF_32BIT))
 117                 task_size = STACK_TOP32;
 118         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 119                 return -ENOMEM;
 120
 121         do_color_align = 0;
 122         if (filp || (flags & MAP_SHARED))
 123                 do_color_align = 1;
 124
 125         if (addr) {
 126                 if (do_color_align)
 127                         addr = COLOUR_ALIGN(addr, pgoff);
 128                 else
 129                         addr = PAGE_ALIGN(addr);
 130
 131                 vma = find_vma(mm, addr);
 132                 if (task_size - len >= addr &&
 133                     (!vma || addr + len <= vma->vm_start))
 134                         return addr;
 135         }
 136
 137         if (len > mm->cached_hole_size) {
 138                 start_addr = addr = mm->free_area_cache;
 139         } else {
 140                 start_addr = addr = TASK_UNMAPPED_BASE;
 141                 mm->cached_hole_size = 0;
 142         }
 143
 144         task_size -= len;
 145
 146 full_search:
 147         if (do_color_align)
 148                 addr = COLOUR_ALIGN(addr, pgoff);
 149         else
 150                 addr = PAGE_ALIGN(addr);
 151
 152         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 153                 /* At this point:  (!vma || addr < vma->vm_end). */
 154                 if (addr < VA_EXCLUDE_START &&
 155                     (addr + len) >= VA_EXCLUDE_START) {
 156                         addr = VA_EXCLUDE_END;
 157                         vma = find_vma(mm, VA_EXCLUDE_END);
 158                 }
 159                 if (unlikely(task_size < addr)) {
 160                         if (start_addr != TASK_UNMAPPED_BASE) {
 161                                 start_addr = addr = TASK_UNMAPPED_BASE;
 162                                 mm->cached_hole_size = 0;
 163                                 goto full_search;
 164                         }
 165                         return -ENOMEM;
 166                 }
 167                 if (likely(!vma || addr + len <= vma->vm_start)) {
 168                         /*
 169                          * Remember the place where we stopped the search:
 170                          */
 171                         mm->free_area_cache = addr + len;
 172                         return addr;
 173                 }
 174                 if (addr + mm->cached_hole_size < vma->vm_start)
 175                         mm->cached_hole_size = vma->vm_start - addr;
 176
 177                 addr = vma->vm_end;
 178                 if (do_color_align)
 179                         addr = COLOUR_ALIGN(addr, pgoff);
 180         }
 181 }
 182
 183 unsigned long
 184 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 185                           const unsigned long len, const unsigned long pgoff,
 186                           const unsigned long flags)
 187 {
 188         struct vm_area_struct *vma;
 189         struct mm_struct *mm = current->mm;
 190         unsigned long task_size = STACK_TOP32;
 191         unsigned long addr = addr0;
 192         int do_color_align;
 193
 194         /* This should only ever run for 32-bit processes.  */
 195         BUG_ON(!test_thread_flag(TIF_32BIT));
 196
 197         if (flags & MAP_FIXED) {
 198                 /* We do not accept a shared mapping if it would violate
 199                  * cache aliasing constraints.
 200                  */
 201                 if ((flags & MAP_SHARED) &&
 202                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 203                         return -EINVAL;
 204                 return addr;
 205         }
 206
 207         if (unlikely(len > task_size))
 208                 return -ENOMEM;
 209
 210         do_color_align = 0;
 211         if (filp || (flags & MAP_SHARED))
 212                 do_color_align = 1;
 213
 214         /* requesting a specific address */
 215         if (addr) {
 216                 if (do_color_align)
 217                         addr = COLOUR_ALIGN(addr, pgoff);
 218                 else
 219                         addr = PAGE_ALIGN(addr);
 220
 221                 vma = find_vma(mm, addr);
 222                 if (task_size - len >= addr &&
 223                     (!vma || addr + len <= vma->vm_start))
 224                         return addr;
 225         }
 226
 227         /* check if free_area_cache is useful for us */
 228         if (len <= mm->cached_hole_size) {
 229                 mm->cached_hole_size = 0;
 230                 mm->free_area_cache = mm->mmap_base;
 231         }
 232
 233         /* either no address requested or can't fit in requested address hole */
 234         addr = mm->free_area_cache;
 235         if (do_color_align) {
 236                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 237
 238                 addr = base + len;
 239         }
 240
 241         /* make sure it can fit in the remaining address space */
 242         if (likely(addr > len)) {
 243                 vma = find_vma(mm, addr-len);
 244                 if (!vma || addr <= vma->vm_start) {
 245                         /* remember the address as a hint for next time */
 246                         return (mm->free_area_cache = addr-len);
 247                 }
 248         }
 249
 250         if (unlikely(mm->mmap_base < len))
 251                 goto bottomup;
 252
 253         addr = mm->mmap_base-len;
 254         if (do_color_align)
 255                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 256
 257         do {
 258                 /*
 259                  * Lookup failure means no vma is above this address,
 260                  * else if new region fits below vma->vm_start,
 261                  * return with success:
 262                  */
 263                 vma = find_vma(mm, addr);
 264                 if (likely(!vma || addr+len <= vma->vm_start)) {
 265                         /* remember the address as a hint for next time */
 266                         return (mm->free_area_cache = addr);
 267                 }
 268
 269                 /* remember the largest hole we saw so far */
 270                 if (addr + mm->cached_hole_size < vma->vm_start)
 271                         mm->cached_hole_size = vma->vm_start - addr;
 272
 273                 /* try just below the current vma->vm_start */
 274                 addr = vma->vm_start-len;
 275                 if (do_color_align)
 276                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 277         } while (likely(len < vma->vm_start));
 278
 279 bottomup:
 280         /*
 281          * A failed mmap() very likely causes application failure,
 282          * so fall back to the bottom-up function here. This scenario
 283          * can happen with large stack limits and large mmap()
 284          * allocations.
 285          */
 286         mm->cached_hole_size = ~0UL;
 287         mm->free_area_cache = TASK_UNMAPPED_BASE;
 288         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 289         /*
 290          * Restore the topdown base:
 291          */
 292         mm->free_area_cache = mm->mmap_base;
 293         mm->cached_hole_size = ~0UL;
 294
 295         return addr;
 296 }
 297
 298 /* Try to align mapping such that we align it as much as possible. */
 299 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 300 {
 301         unsigned long align_goal, addr = -ENOMEM;
 302         unsigned long (*get_area)(struct file *, unsigned long,
 303                                   unsigned long, unsigned long, unsigned long);
 304
 305         get_area = current->mm->get_unmapped_area;
 306
 307         if (flags & MAP_FIXED) {
 308                 /* Ok, don't mess with it. */
 309                 return get_area(NULL, orig_addr, len, pgoff, flags);
 310         }
 311         flags &= ~MAP_SHARED;
 312
 313         align_goal = PAGE_SIZE;
 314         if (len >= (4UL * 1024 * 1024))
 315                 align_goal = (4UL * 1024 * 1024);
 316         else if (len >= (512UL * 1024))
 317                 align_goal = (512UL * 1024);
 318         else if (len >= (64UL * 1024))
 319                 align_goal = (64UL * 1024);
 320
 321         do {
 322                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 323                 if (!(addr & ~PAGE_MASK)) {
 324                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 325                         break;
 326                 }
 327
 328                 if (align_goal == (4UL * 1024 * 1024))
 329                         align_goal = (512UL * 1024);
 330                 else if (align_goal == (512UL * 1024))
 331                         align_goal = (64UL * 1024);
 332                 else
 333                         align_goal = PAGE_SIZE;
 334         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 335
 336         /* Mapping is smaller than 64K or larger areas could not
 337          * be obtained.
 338          */
 339         if (addr & ~PAGE_MASK)
 340                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
 341
 342         return addr;
 343 }
 344 EXPORT_SYMBOL(get_fb_unmapped_area);
 345
 346 /* Essentially the same as PowerPC.  */
 347 static unsigned long mmap_rnd(void)
 348 {
 349         unsigned long rnd = 0UL;
 350
 351         if (current->flags & PF_RANDOMIZE) {
 352                 unsigned long val = get_random_int();
 353                 if (test_thread_flag(TIF_32BIT))
 354                         rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
 355                 else
 356                         rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
 357         }
 358         return rnd << PAGE_SHIFT;
 359 }
 360
 361 void arch_pick_mmap_layout(struct mm_struct *mm)
 362 {
 363         unsigned long random_factor = mmap_rnd();
 364         unsigned long gap;
 365
 366         /*
 367          * Fall back to the standard layout if the personality
 368          * bit is set, or if the expected stack growth is unlimited:
 369          */
 370         gap = rlimit(RLIMIT_STACK);
 371         if (!test_thread_flag(TIF_32BIT) ||
 372             (current->personality & ADDR_COMPAT_LAYOUT) ||
 373             gap == RLIM_INFINITY ||
 374             sysctl_legacy_va_layout) {
 375                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 376                 mm->get_unmapped_area = arch_get_unmapped_area;
 377                 mm->unmap_area = arch_unmap_area;
 378         } else {
 379                 /* We know it's 32-bit */
 380                 unsigned long task_size = STACK_TOP32;
 381
 382                 if (gap < 128 * 1024 * 1024)
 383                         gap = 128 * 1024 * 1024;
 384                 if (gap > (task_size / 6 * 5))
 385                         gap = (task_size / 6 * 5);
 386
 387                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 388                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 389                 mm->unmap_area = arch_unmap_area_topdown;
 390         }
 391 }
 392
 393 /*
 394  * sys_pipe() is the normal C calling standard for creating
 395  * a pipe. It's not the way unix traditionally does this, though.
 396  */
 397 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 398 {
 399         int fd[2];
 400         int error;
 401
 402         error = do_pipe_flags(fd, 0);
 403         if (error)
 404                 goto out;
 405         regs->u_regs[UREG_I1] = fd[1];
 406         error = fd[0];
 407 out:
 408         return error;
 409 }
 410
 411 /*
 412  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 413  *
 414  * This is really horribly ugly.
 415  */
 416
 417 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 418                 unsigned long, third, void __user *, ptr, long, fifth)
 419 {
 420         long err;
 421
 422         /* No need for backward compatibility. We can start fresh... */
 423         if (call <= SEMCTL) {
 424                 switch (call) {
 425                 case SEMOP:
 426                         err = sys_semtimedop(first, ptr,
 427                                              (unsigned)second, NULL);
 428                         goto out;
 429                 case SEMTIMEDOP:
 430                         err = sys_semtimedop(first, ptr, (unsigned)second,
 431                                 (const struct timespec __user *)
 432                                              (unsigned long) fifth);
 433                         goto out;
 434                 case SEMGET:
 435                         err = sys_semget(first, (int)second, (int)third);
 436                         goto out;
 437                 case SEMCTL: {
 438                         err = sys_semctl(first, second,
 439                                          (int)third | IPC_64,
 440                                          (union semun) ptr);
 441                         goto out;
 442                 }
 443                 default:
 444                         err = -ENOSYS;
 445                         goto out;
 446                 }
 447         }
 448         if (call <= MSGCTL) {
 449                 switch (call) {
 450                 case MSGSND:
 451                         err = sys_msgsnd(first, ptr, (size_t)second,
 452                                          (int)third);
 453                         goto out;
 454                 case MSGRCV:
 455                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 456                                          (int)third);
 457                         goto out;
 458                 case MSGGET:
 459                         err = sys_msgget((key_t)first, (int)second);
 460                         goto out;
 461                 case MSGCTL:
 462                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 463                         goto out;
 464                 default:
 465                         err = -ENOSYS;
 466                         goto out;
 467                 }
 468         }
 469         if (call <= SHMCTL) {
 470                 switch (call) {
 471                 case SHMAT: {
 472                         ulong raddr;
 473                         err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
 474                         if (!err) {
 475                                 if (put_user(raddr,
 476                                              (ulong __user *) third))
 477                                         err = -EFAULT;
 478                         }
 479                         goto out;
 480                 }
 481                 case SHMDT:
 482                         err = sys_shmdt(ptr);
 483                         goto out;
 484                 case SHMGET:
 485                         err = sys_shmget(first, (size_t)second, (int)third);
 486                         goto out;
 487                 case SHMCTL:
 488                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 489                         goto out;
 490                 default:
 491                         err = -ENOSYS;
 492                         goto out;
 493                 }
 494         } else {
 495                 err = -ENOSYS;
 496         }
 497 out:
 498         return err;
 499 }
 500
 501 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 502 {
 503         int ret;
 504
 505         if (current->personality == PER_LINUX32 &&
 506             personality == PER_LINUX)
 507                 personality = PER_LINUX32;
 508         ret = sys_personality(personality);
 509         if (ret == PER_LINUX32)
 510                 ret = PER_LINUX;
 511
 512         return ret;
 513 }
 514
 515 int sparc_mmap_check(unsigned long addr, unsigned long len)
 516 {
 517         if (test_thread_flag(TIF_32BIT)) {
 518                 if (len >= STACK_TOP32)
 519                         return -EINVAL;
 520
 521                 if (addr > STACK_TOP32 - len)
 522                         return -EINVAL;
 523         } else {
 524                 if (len >= VA_EXCLUDE_START)
 525                         return -EINVAL;
 526
 527                 if (invalid_64bit_range(addr, len))
 528                         return -EINVAL;
 529         }
 530
 531         return 0;
 532 }
 533
 534 /* Linux version of mmap */
 535 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 536                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
 537                 unsigned long, off)
 538 {
 539         unsigned long retval = -EINVAL;
 540
 541         if ((off + PAGE_ALIGN(len)) < off)
 542                 goto out;
 543         if (off & ~PAGE_MASK)
 544                 goto out;
 545         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 546 out:
 547         return retval;
 548 }
 549
 550 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 551 {
 552         if (invalid_64bit_range(addr, len))
 553                 return -EINVAL;
 554
 555         return vm_munmap(addr, len);
 556 }
 557
 558 extern unsigned long do_mremap(unsigned long addr,
 559         unsigned long old_len, unsigned long new_len,
 560         unsigned long flags, unsigned long new_addr);
 561
 562 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 563                 unsigned long, new_len, unsigned long, flags,
 564                 unsigned long, new_addr)
 565 {
 566         if (test_thread_flag(TIF_32BIT))
 567                 return -EINVAL;
 568         return sys_mremap(addr, old_len, new_len, flags, new_addr);
 569 }
 570
 571 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 572 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 573 {
 574         static int count;
 575
 576         /* Don't make the system unusable, if someone goes stuck */
 577         if (count++ > 5)
 578                 return -ENOSYS;
 579
 580         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 581 #ifdef DEBUG_UNIMP_SYSCALL
 582         show_regs (regs);
 583 #endif
 584
 585         return -ENOSYS;
 586 }
 587
 588 /* #define DEBUG_SPARC_BREAKPOINT */
 589
 590 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 591 {
 592         siginfo_t info;
 593
 594         if (test_thread_flag(TIF_32BIT)) {
 595                 regs->tpc &= 0xffffffff;
 596                 regs->tnpc &= 0xffffffff;
 597         }
 598 #ifdef DEBUG_SPARC_BREAKPOINT
 599         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 600 #endif
 601         info.si_signo = SIGTRAP;
 602         info.si_errno = 0;
 603         info.si_code = TRAP_BRKPT;
 604         info.si_addr = (void __user *)regs->tpc;
 605         info.si_trapno = 0;
 606         force_sig_info(SIGTRAP, &info, current);
 607 #ifdef DEBUG_SPARC_BREAKPOINT
 608         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 609 #endif
 610 }
 611
 612 extern void check_pending(int signum);
 613
 614 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 615 {
 616         int nlen, err;
 617
 618         if (len < 0)
 619                 return -EINVAL;
 620
 621         down_read(&uts_sem);
 622
 623         nlen = strlen(utsname()->domainname) + 1;
 624         err = -EINVAL;
 625         if (nlen > len)
 626                 goto out;
 627
 628         err = -EFAULT;
 629         if (!copy_to_user(name, utsname()->domainname, nlen))
 630                 err = 0;
 631
 632 out:
 633         up_read(&uts_sem);
 634         return err;
 635 }
 636
 637 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 638                 utrap_handler_t, new_p, utrap_handler_t, new_d,
 639                 utrap_handler_t __user *, old_p,
 640                 utrap_handler_t __user *, old_d)
 641 {
 642         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 643                 return -EINVAL;
 644         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 645                 if (old_p) {
 646                         if (!current_thread_info()->utraps) {
 647                                 if (put_user(NULL, old_p))
 648                                         return -EFAULT;
 649                         } else {
 650                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 651                                         return -EFAULT;
 652                         }
 653                 }
 654                 if (old_d) {
 655                         if (put_user(NULL, old_d))
 656                                 return -EFAULT;
 657                 }
 658                 return 0;
 659         }
 660         if (!current_thread_info()->utraps) {
 661                 current_thread_info()->utraps =
 662                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 663                 if (!current_thread_info()->utraps)
 664                         return -ENOMEM;
 665                 current_thread_info()->utraps[0] = 1;
 666         } else {
 667                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 668                     current_thread_info()->utraps[0] > 1) {
 669                         unsigned long *p = current_thread_info()->utraps;
 670
 671                         current_thread_info()->utraps =
 672                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 673                                         GFP_KERNEL);
 674                         if (!current_thread_info()->utraps) {
 675                                 current_thread_info()->utraps = p;
 676                                 return -ENOMEM;
 677                         }
 678                         p[0]--;
 679                         current_thread_info()->utraps[0] = 1;
 680                         memcpy(current_thread_info()->utraps+1, p+1,
 681                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 682                 }
 683         }
 684         if (old_p) {
 685                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 686                         return -EFAULT;
 687         }
 688         if (old_d) {
 689                 if (put_user(NULL, old_d))
 690                         return -EFAULT;
 691         }
 692         current_thread_info()->utraps[type] = (long)new_p;
 693
 694         return 0;
 695 }
 696
 697 asmlinkage long sparc_memory_ordering(unsigned long model,
 698                                       struct pt_regs *regs)
 699 {
 700         if (model >= 3)
 701                 return -EINVAL;
 702         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 703         return 0;
 704 }
 705
 706 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 707                 struct sigaction __user *, oact, void __user *, restorer,
 708                 size_t, sigsetsize)
 709 {
 710         struct k_sigaction new_ka, old_ka;
 711         int ret;
 712
 713         /* XXX: Don't preclude handling different sized sigset_t's.  */
 714         if (sigsetsize != sizeof(sigset_t))
 715                 return -EINVAL;
 716
 717         if (act) {
 718                 new_ka.ka_restorer = restorer;
 719                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 720                         return -EFAULT;
 721         }
 722
 723         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 724
 725         if (!ret && oact) {
 726                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 727                         return -EFAULT;
 728         }
 729
 730         return ret;
 731 }
 732
 733 /*
 734  * Do a system call from kernel instead of calling sys_execve so we
 735  * end up with proper pt_regs.
 736  */
 737 int kernel_execve(const char *filename,
 738                   const char *const argv[],
 739                   const char *const envp[])
 740 {
 741         long __res;
 742         register long __g1 __asm__ ("g1") = __NR_execve;
 743         register long __o0 __asm__ ("o0") = (long)(filename);
 744         register long __o1 __asm__ ("o1") = (long)(argv);
 745         register long __o2 __asm__ ("o2") = (long)(envp);
 746         asm volatile ("t 0x6d\n\t"
 747                       "sub %%g0, %%o0, %0\n\t"
 748                       "movcc %%xcc, %%o0, %0\n\t"
 749                       : "=r" (__res), "=&r" (__o0)
 750                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 751                       : "cc");
 752         return __res;
 753 }