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