arch/sparc64/kernel/sys_sparc.c

   1 /* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $
   2  * linux/arch/sparc64/kernel/sys_sparc.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/sparc
   6  * platform.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/mm.h>
  15 #include <linux/sem.h>
  16 #include <linux/msg.h>
  17 #include <linux/shm.h>
  18 #include <linux/stat.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/slab.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/ipc.h>
  25 #include <linux/personality.h>
  26 #include <linux/random.h>
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/utrap.h>
  30 #include <asm/perfctr.h>
  31 #include <asm/unistd.h>
  32
  33 /* #define DEBUG_UNIMP_SYSCALL */
  34
  35 asmlinkage unsigned long sys_getpagesize(void)
  36 {
  37         return PAGE_SIZE;
  38 }
  39
  40 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
  41 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
  42
  43 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  44  * overflow past the end of the 64-bit address space?
  45  */
  46 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  47 {
  48         unsigned long va_exclude_start, va_exclude_end;
  49
  50         va_exclude_start = VA_EXCLUDE_START;
  51         va_exclude_end   = VA_EXCLUDE_END;
  52
  53         if (unlikely(len >= va_exclude_start))
  54                 return 1;
  55
  56         if (unlikely((addr + len) < addr))
  57                 return 1;
  58
  59         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  60                      ((addr + len) >= va_exclude_start &&
  61                       (addr + len) < va_exclude_end)))
  62                 return 1;
  63
  64         return 0;
  65 }
  66
  67 /* Does start,end straddle the VA-space hole?  */
  68 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  69 {
  70         unsigned long va_exclude_start, va_exclude_end;
  71
  72         va_exclude_start = VA_EXCLUDE_START;
  73         va_exclude_end   = VA_EXCLUDE_END;
  74
  75         if (likely(start < va_exclude_start && end < va_exclude_start))
  76                 return 0;
  77
  78         if (likely(start >= va_exclude_end && end >= va_exclude_end))
  79                 return 0;
  80
  81         return 1;
  82 }
  83
  84 /* These functions differ from the default implementations in
  85  * mm/mmap.c in two ways:
  86  *
  87  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  88  *    for fixed such mappings we just validate what the user gave us.
  89  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  90  *    the spitfire/niagara VA-hole.
  91  */
  92
  93 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  94                                          unsigned long pgoff)
  95 {
  96         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  97         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  98
  99         return base + off;
 100 }
 101
 102 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 103                                               unsigned long pgoff)
 104 {
 105         unsigned long base = addr & ~(SHMLBA-1);
 106         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 107
 108         if (base + off <= addr)
 109                 return base + off;
 110         return base - off;
 111 }
 112
 113 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 114 {
 115         struct mm_struct *mm = current->mm;
 116         struct vm_area_struct * vma;
 117         unsigned long task_size = TASK_SIZE;
 118         unsigned long start_addr;
 119         int do_color_align;
 120
 121         if (flags & MAP_FIXED) {
 122                 /* We do not accept a shared mapping if it would violate
 123                  * cache aliasing constraints.
 124                  */
 125                 if ((flags & MAP_SHARED) &&
 126                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 127                         return -EINVAL;
 128                 return addr;
 129         }
 130
 131         if (test_thread_flag(TIF_32BIT))
 132                 task_size = STACK_TOP32;
 133         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 134                 return -ENOMEM;
 135
 136         do_color_align = 0;
 137         if (filp || (flags & MAP_SHARED))
 138                 do_color_align = 1;
 139
 140         if (addr) {
 141                 if (do_color_align)
 142                         addr = COLOUR_ALIGN(addr, pgoff);
 143                 else
 144                         addr = PAGE_ALIGN(addr);
 145
 146                 vma = find_vma(mm, addr);
 147                 if (task_size - len >= addr &&
 148                     (!vma || addr + len <= vma->vm_start))
 149                         return addr;
 150         }
 151
 152         if (len > mm->cached_hole_size) {
 153                 start_addr = addr = mm->free_area_cache;
 154         } else {
 155                 start_addr = addr = TASK_UNMAPPED_BASE;
 156                 mm->cached_hole_size = 0;
 157         }
 158
 159         task_size -= len;
 160
 161 full_search:
 162         if (do_color_align)
 163                 addr = COLOUR_ALIGN(addr, pgoff);
 164         else
 165                 addr = PAGE_ALIGN(addr);
 166
 167         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 168                 /* At this point:  (!vma || addr < vma->vm_end). */
 169                 if (addr < VA_EXCLUDE_START &&
 170                     (addr + len) >= VA_EXCLUDE_START) {
 171                         addr = VA_EXCLUDE_END;
 172                         vma = find_vma(mm, VA_EXCLUDE_END);
 173                 }
 174                 if (unlikely(task_size < addr)) {
 175                         if (start_addr != TASK_UNMAPPED_BASE) {
 176                                 start_addr = addr = TASK_UNMAPPED_BASE;
 177                                 mm->cached_hole_size = 0;
 178                                 goto full_search;
 179                         }
 180                         return -ENOMEM;
 181                 }
 182                 if (likely(!vma || addr + len <= vma->vm_start)) {
 183                         /*
 184                          * Remember the place where we stopped the search:
 185                          */
 186                         mm->free_area_cache = addr + len;
 187                         return addr;
 188                 }
 189                 if (addr + mm->cached_hole_size < vma->vm_start)
 190                         mm->cached_hole_size = vma->vm_start - addr;
 191
 192                 addr = vma->vm_end;
 193                 if (do_color_align)
 194                         addr = COLOUR_ALIGN(addr, pgoff);
 195         }
 196 }
 197
 198 unsigned long
 199 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 200                           const unsigned long len, const unsigned long pgoff,
 201                           const unsigned long flags)
 202 {
 203         struct vm_area_struct *vma;
 204         struct mm_struct *mm = current->mm;
 205         unsigned long task_size = STACK_TOP32;
 206         unsigned long addr = addr0;
 207         int do_color_align;
 208
 209         /* This should only ever run for 32-bit processes.  */
 210         BUG_ON(!test_thread_flag(TIF_32BIT));
 211
 212         if (flags & MAP_FIXED) {
 213                 /* We do not accept a shared mapping if it would violate
 214                  * cache aliasing constraints.
 215                  */
 216                 if ((flags & MAP_SHARED) &&
 217                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 218                         return -EINVAL;
 219                 return addr;
 220         }
 221
 222         if (unlikely(len > task_size))
 223                 return -ENOMEM;
 224
 225         do_color_align = 0;
 226         if (filp || (flags & MAP_SHARED))
 227                 do_color_align = 1;
 228
 229         /* requesting a specific address */
 230         if (addr) {
 231                 if (do_color_align)
 232                         addr = COLOUR_ALIGN(addr, pgoff);
 233                 else
 234                         addr = PAGE_ALIGN(addr);
 235
 236                 vma = find_vma(mm, addr);
 237                 if (task_size - len >= addr &&
 238                     (!vma || addr + len <= vma->vm_start))
 239                         return addr;
 240         }
 241
 242         /* check if free_area_cache is useful for us */
 243         if (len <= mm->cached_hole_size) {
 244                 mm->cached_hole_size = 0;
 245                 mm->free_area_cache = mm->mmap_base;
 246         }
 247
 248         /* either no address requested or can't fit in requested address hole */
 249         addr = mm->free_area_cache;
 250         if (do_color_align) {
 251                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 252
 253                 addr = base + len;
 254         }
 255
 256         /* make sure it can fit in the remaining address space */
 257         if (likely(addr > len)) {
 258                 vma = find_vma(mm, addr-len);
 259                 if (!vma || addr <= vma->vm_start) {
 260                         /* remember the address as a hint for next time */
 261                         return (mm->free_area_cache = addr-len);
 262                 }
 263         }
 264
 265         if (unlikely(mm->mmap_base < len))
 266                 goto bottomup;
 267
 268         addr = mm->mmap_base-len;
 269         if (do_color_align)
 270                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 271
 272         do {
 273                 /*
 274                  * Lookup failure means no vma is above this address,
 275                  * else if new region fits below vma->vm_start,
 276                  * return with success:
 277                  */
 278                 vma = find_vma(mm, addr);
 279                 if (likely(!vma || addr+len <= vma->vm_start)) {
 280                         /* remember the address as a hint for next time */
 281                         return (mm->free_area_cache = addr);
 282                 }
 283
 284                 /* remember the largest hole we saw so far */
 285                 if (addr + mm->cached_hole_size < vma->vm_start)
 286                         mm->cached_hole_size = vma->vm_start - addr;
 287
 288                 /* try just below the current vma->vm_start */
 289                 addr = vma->vm_start-len;
 290                 if (do_color_align)
 291                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 292         } while (likely(len < vma->vm_start));
 293
 294 bottomup:
 295         /*
 296          * A failed mmap() very likely causes application failure,
 297          * so fall back to the bottom-up function here. This scenario
 298          * can happen with large stack limits and large mmap()
 299          * allocations.
 300          */
 301         mm->cached_hole_size = ~0UL;
 302         mm->free_area_cache = TASK_UNMAPPED_BASE;
 303         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 304         /*
 305          * Restore the topdown base:
 306          */
 307         mm->free_area_cache = mm->mmap_base;
 308         mm->cached_hole_size = ~0UL;
 309
 310         return addr;
 311 }
 312
 313 /* Try to align mapping such that we align it as much as possible. */
 314 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 315 {
 316         unsigned long align_goal, addr = -ENOMEM;
 317
 318         if (flags & MAP_FIXED) {
 319                 /* Ok, don't mess with it. */
 320                 return get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 321         }
 322         flags &= ~MAP_SHARED;
 323
 324         align_goal = PAGE_SIZE;
 325         if (len >= (4UL * 1024 * 1024))
 326                 align_goal = (4UL * 1024 * 1024);
 327         else if (len >= (512UL * 1024))
 328                 align_goal = (512UL * 1024);
 329         else if (len >= (64UL * 1024))
 330                 align_goal = (64UL * 1024);
 331
 332         do {
 333                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 334                 if (!(addr & ~PAGE_MASK)) {
 335                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 336                         break;
 337                 }
 338
 339                 if (align_goal == (4UL * 1024 * 1024))
 340                         align_goal = (512UL * 1024);
 341                 else if (align_goal == (512UL * 1024))
 342                         align_goal = (64UL * 1024);
 343                 else
 344                         align_goal = PAGE_SIZE;
 345         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 346
 347         /* Mapping is smaller than 64K or larger areas could not
 348          * be obtained.
 349          */
 350         if (addr & ~PAGE_MASK)
 351                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
 352
 353         return addr;
 354 }
 355
 356 /* Essentially the same as PowerPC... */
 357 void arch_pick_mmap_layout(struct mm_struct *mm)
 358 {
 359         unsigned long random_factor = 0UL;
 360
 361         if (current->flags & PF_RANDOMIZE) {
 362                 random_factor = get_random_int();
 363                 if (test_thread_flag(TIF_32BIT))
 364                         random_factor &= ((1 * 1024 * 1024) - 1);
 365                 else
 366                         random_factor = ((random_factor << PAGE_SHIFT) &
 367                                          0xffffffffUL);
 368         }
 369
 370         /*
 371          * Fall back to the standard layout if the personality
 372          * bit is set, or if the expected stack growth is unlimited:
 373          */
 374         if (!test_thread_flag(TIF_32BIT) ||
 375             (current->personality & ADDR_COMPAT_LAYOUT) ||
 376             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
 377             sysctl_legacy_va_layout) {
 378                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 379                 mm->get_unmapped_area = arch_get_unmapped_area;
 380                 mm->unmap_area = arch_unmap_area;
 381         } else {
 382                 /* We know it's 32-bit */
 383                 unsigned long task_size = STACK_TOP32;
 384                 unsigned long gap;
 385
 386                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
 387                 if (gap < 128 * 1024 * 1024)
 388                         gap = 128 * 1024 * 1024;
 389                 if (gap > (task_size / 6 * 5))
 390                         gap = (task_size / 6 * 5);
 391
 392                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 393                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 394                 mm->unmap_area = arch_unmap_area_topdown;
 395         }
 396 }
 397
 398 asmlinkage unsigned long sparc_brk(unsigned long brk)
 399 {
 400         /* People could try to be nasty and use ta 0x6d in 32bit programs */
 401         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 402                 return current->mm->brk;
 403
 404         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 405                 return current->mm->brk;
 406
 407         return sys_brk(brk);
 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 asmlinkage long sparc_pipe(struct pt_regs *regs)
 415 {
 416         int fd[2];
 417         int error;
 418
 419         error = do_pipe(fd);
 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 asmlinkage long sys_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 *) fifth);
 449                         goto out;
 450                 case SEMGET:
 451                         err = sys_semget(first, (int)second, (int)third);
 452                         goto out;
 453                 case SEMCTL: {
 454                         err = sys_semctl(first, third,
 455                                          (int)second | IPC_64,
 456                                          (union semun) ptr);
 457                         goto out;
 458                 }
 459                 default:
 460                         err = -ENOSYS;
 461                         goto out;
 462                 };
 463         }
 464         if (call <= MSGCTL) {
 465                 switch (call) {
 466                 case MSGSND:
 467                         err = sys_msgsnd(first, ptr, (size_t)second,
 468                                          (int)third);
 469                         goto out;
 470                 case MSGRCV:
 471                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 472                                          (int)third);
 473                         goto out;
 474                 case MSGGET:
 475                         err = sys_msgget((key_t)first, (int)second);
 476                         goto out;
 477                 case MSGCTL:
 478                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 479                         goto out;
 480                 default:
 481                         err = -ENOSYS;
 482                         goto out;
 483                 };
 484         }
 485         if (call <= SHMCTL) {
 486                 switch (call) {
 487                 case SHMAT: {
 488                         ulong raddr;
 489                         err = do_shmat(first, ptr, (int)second, &raddr);
 490                         if (!err) {
 491                                 if (put_user(raddr,
 492                                              (ulong __user *) third))
 493                                         err = -EFAULT;
 494                         }
 495                         goto out;
 496                 }
 497                 case SHMDT:
 498                         err = sys_shmdt(ptr);
 499                         goto out;
 500                 case SHMGET:
 501                         err = sys_shmget(first, (size_t)second, (int)third);
 502                         goto out;
 503                 case SHMCTL:
 504                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 505                         goto out;
 506                 default:
 507                         err = -ENOSYS;
 508                         goto out;
 509                 };
 510         } else {
 511                 err = -ENOSYS;
 512         }
 513 out:
 514         return err;
 515 }
 516
 517 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 518 {
 519         int ret = sys_newuname(name);
 520
 521         if (current->personality == PER_LINUX32 && !ret) {
 522                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
 523                        ? -EFAULT : 0);
 524         }
 525         return ret;
 526 }
 527
 528 asmlinkage long sparc64_personality(unsigned long personality)
 529 {
 530         int ret;
 531
 532         if (current->personality == PER_LINUX32 &&
 533             personality == PER_LINUX)
 534                 personality = PER_LINUX32;
 535         ret = sys_personality(personality);
 536         if (ret == PER_LINUX32)
 537                 ret = PER_LINUX;
 538
 539         return ret;
 540 }
 541
 542 int sparc64_mmap_check(unsigned long addr, unsigned long len,
 543                 unsigned long flags)
 544 {
 545         if (test_thread_flag(TIF_32BIT)) {
 546                 if (len >= STACK_TOP32)
 547                         return -EINVAL;
 548
 549                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
 550                         return -EINVAL;
 551         } else {
 552                 if (len >= VA_EXCLUDE_START)
 553                         return -EINVAL;
 554
 555                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
 556                         return -EINVAL;
 557         }
 558
 559         return 0;
 560 }
 561
 562 /* Linux version of mmap */
 563 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 564         unsigned long prot, unsigned long flags, unsigned long fd,
 565         unsigned long off)
 566 {
 567         struct file * file = NULL;
 568         unsigned long retval = -EBADF;
 569
 570         if (!(flags & MAP_ANONYMOUS)) {
 571                 file = fget(fd);
 572                 if (!file)
 573                         goto out;
 574         }
 575         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 576         len = PAGE_ALIGN(len);
 577
 578         down_write(&current->mm->mmap_sem);
 579         retval = do_mmap(file, addr, len, prot, flags, off);
 580         up_write(&current->mm->mmap_sem);
 581
 582         if (file)
 583                 fput(file);
 584 out:
 585         return retval;
 586 }
 587
 588 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 589 {
 590         long ret;
 591
 592         if (invalid_64bit_range(addr, len))
 593                 return -EINVAL;
 594
 595         down_write(&current->mm->mmap_sem);
 596         ret = do_munmap(current->mm, addr, len);
 597         up_write(&current->mm->mmap_sem);
 598         return ret;
 599 }
 600
 601 extern unsigned long do_mremap(unsigned long addr,
 602         unsigned long old_len, unsigned long new_len,
 603         unsigned long flags, unsigned long new_addr);
 604
 605 asmlinkage unsigned long sys64_mremap(unsigned long addr,
 606         unsigned long old_len, unsigned long new_len,
 607         unsigned long flags, unsigned long new_addr)
 608 {
 609         struct vm_area_struct *vma;
 610         unsigned long ret = -EINVAL;
 611
 612         if (test_thread_flag(TIF_32BIT))
 613                 goto out;
 614         if (unlikely(new_len >= VA_EXCLUDE_START))
 615                 goto out;
 616         if (unlikely(invalid_64bit_range(addr, old_len)))
 617                 goto out;
 618
 619         down_write(&current->mm->mmap_sem);
 620         if (flags & MREMAP_FIXED) {
 621                 if (invalid_64bit_range(new_addr, new_len))
 622                         goto out_sem;
 623         } else if (invalid_64bit_range(addr, new_len)) {
 624                 unsigned long map_flags = 0;
 625                 struct file *file = NULL;
 626
 627                 ret = -ENOMEM;
 628                 if (!(flags & MREMAP_MAYMOVE))
 629                         goto out_sem;
 630
 631                 vma = find_vma(current->mm, addr);
 632                 if (vma) {
 633                         if (vma->vm_flags & VM_SHARED)
 634                                 map_flags |= MAP_SHARED;
 635                         file = vma->vm_file;
 636                 }
 637
 638                 /* MREMAP_FIXED checked above. */
 639                 new_addr = get_unmapped_area(file, addr, new_len,
 640                                     vma ? vma->vm_pgoff : 0,
 641                                     map_flags);
 642                 ret = new_addr;
 643                 if (new_addr & ~PAGE_MASK)
 644                         goto out_sem;
 645                 flags |= MREMAP_FIXED;
 646         }
 647         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 648 out_sem:
 649         up_write(&current->mm->mmap_sem);
 650 out:
 651         return ret;
 652 }
 653
 654 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 655 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 656 {
 657         static int count;
 658
 659         /* Don't make the system unusable, if someone goes stuck */
 660         if (count++ > 5)
 661                 return -ENOSYS;
 662
 663         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 664 #ifdef DEBUG_UNIMP_SYSCALL
 665         show_regs (regs);
 666 #endif
 667
 668         return -ENOSYS;
 669 }
 670
 671 /* #define DEBUG_SPARC_BREAKPOINT */
 672
 673 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 674 {
 675         siginfo_t info;
 676
 677         if (test_thread_flag(TIF_32BIT)) {
 678                 regs->tpc &= 0xffffffff;
 679                 regs->tnpc &= 0xffffffff;
 680         }
 681 #ifdef DEBUG_SPARC_BREAKPOINT
 682         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 683 #endif
 684         info.si_signo = SIGTRAP;
 685         info.si_errno = 0;
 686         info.si_code = TRAP_BRKPT;
 687         info.si_addr = (void __user *)regs->tpc;
 688         info.si_trapno = 0;
 689         force_sig_info(SIGTRAP, &info, current);
 690 #ifdef DEBUG_SPARC_BREAKPOINT
 691         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 692 #endif
 693 }
 694
 695 extern void check_pending(int signum);
 696
 697 asmlinkage long sys_getdomainname(char __user *name, int len)
 698 {
 699         int nlen, err;
 700
 701         if (len < 0)
 702                 return -EINVAL;
 703
 704         down_read(&uts_sem);
 705
 706         nlen = strlen(utsname()->domainname) + 1;
 707         err = -EINVAL;
 708         if (nlen > len)
 709                 goto out;
 710
 711         err = -EFAULT;
 712         if (!copy_to_user(name, utsname()->domainname, nlen))
 713                 err = 0;
 714
 715 out:
 716         up_read(&uts_sem);
 717         return err;
 718 }
 719
 720 asmlinkage long solaris_syscall(struct pt_regs *regs)
 721 {
 722         static int count;
 723
 724         regs->tpc = regs->tnpc;
 725         regs->tnpc += 4;
 726         if (test_thread_flag(TIF_32BIT)) {
 727                 regs->tpc &= 0xffffffff;
 728                 regs->tnpc &= 0xffffffff;
 729         }
 730         if (++count <= 5) {
 731                 printk ("For Solaris binary emulation you need solaris module loaded\n");
 732                 show_regs (regs);
 733         }
 734         send_sig(SIGSEGV, current, 1);
 735
 736         return -ENOSYS;
 737 }
 738
 739 #ifndef CONFIG_SUNOS_EMUL
 740 asmlinkage long sunos_syscall(struct pt_regs *regs)
 741 {
 742         static int count;
 743
 744         regs->tpc = regs->tnpc;
 745         regs->tnpc += 4;
 746         if (test_thread_flag(TIF_32BIT)) {
 747                 regs->tpc &= 0xffffffff;
 748                 regs->tnpc &= 0xffffffff;
 749         }
 750         if (++count <= 20)
 751                 printk ("SunOS binary emulation not compiled in\n");
 752         force_sig(SIGSEGV, current);
 753
 754         return -ENOSYS;
 755 }
 756 #endif
 757
 758 asmlinkage long sys_utrap_install(utrap_entry_t type,
 759                                   utrap_handler_t new_p,
 760                                   utrap_handler_t new_d,
 761                                   utrap_handler_t __user *old_p,
 762                                   utrap_handler_t __user *old_d)
 763 {
 764         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 765                 return -EINVAL;
 766         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 767                 if (old_p) {
 768                         if (!current_thread_info()->utraps) {
 769                                 if (put_user(NULL, old_p))
 770                                         return -EFAULT;
 771                         } else {
 772                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 773                                         return -EFAULT;
 774                         }
 775                 }
 776                 if (old_d) {
 777                         if (put_user(NULL, old_d))
 778                                 return -EFAULT;
 779                 }
 780                 return 0;
 781         }
 782         if (!current_thread_info()->utraps) {
 783                 current_thread_info()->utraps =
 784                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 785                 if (!current_thread_info()->utraps)
 786                         return -ENOMEM;
 787                 current_thread_info()->utraps[0] = 1;
 788         } else {
 789                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 790                     current_thread_info()->utraps[0] > 1) {
 791                         long *p = current_thread_info()->utraps;
 792
 793                         current_thread_info()->utraps =
 794                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 795                                         GFP_KERNEL);
 796                         if (!current_thread_info()->utraps) {
 797                                 current_thread_info()->utraps = p;
 798                                 return -ENOMEM;
 799                         }
 800                         p[0]--;
 801                         current_thread_info()->utraps[0] = 1;
 802                         memcpy(current_thread_info()->utraps+1, p+1,
 803                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 804                 }
 805         }
 806         if (old_p) {
 807                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 808                         return -EFAULT;
 809         }
 810         if (old_d) {
 811                 if (put_user(NULL, old_d))
 812                         return -EFAULT;
 813         }
 814         current_thread_info()->utraps[type] = (long)new_p;
 815
 816         return 0;
 817 }
 818
 819 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 820 {
 821         if (model >= 3)
 822                 return -EINVAL;
 823         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 824         return 0;
 825 }
 826
 827 asmlinkage long sys_rt_sigaction(int sig,
 828                                  const struct sigaction __user *act,
 829                                  struct sigaction __user *oact,
 830                                  void __user *restorer,
 831                                  size_t sigsetsize)
 832 {
 833         struct k_sigaction new_ka, old_ka;
 834         int ret;
 835
 836         /* XXX: Don't preclude handling different sized sigset_t's.  */
 837         if (sigsetsize != sizeof(sigset_t))
 838                 return -EINVAL;
 839
 840         if (act) {
 841                 new_ka.ka_restorer = restorer;
 842                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 843                         return -EFAULT;
 844         }
 845
 846         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 847
 848         if (!ret && oact) {
 849                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 850                         return -EFAULT;
 851         }
 852
 853         return ret;
 854 }
 855
 856 /* Invoked by rtrap code to update performance counters in
 857  * user space.
 858  */
 859 asmlinkage void update_perfctrs(void)
 860 {
 861         unsigned long pic, tmp;
 862
 863         read_pic(pic);
 864         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 865         __put_user(tmp, current_thread_info()->user_cntd0);
 866         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 867         __put_user(tmp, current_thread_info()->user_cntd1);
 868         reset_pic();
 869 }
 870
 871 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 872 {
 873         int err = 0;
 874
 875         switch(opcode) {
 876         case PERFCTR_ON:
 877                 current_thread_info()->pcr_reg = arg2;
 878                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
 879                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 880                 current_thread_info()->kernel_cntd0 =
 881                         current_thread_info()->kernel_cntd1 = 0;
 882                 write_pcr(arg2);
 883                 reset_pic();
 884                 set_thread_flag(TIF_PERFCTR);
 885                 break;
 886
 887         case PERFCTR_OFF:
 888                 err = -EINVAL;
 889                 if (test_thread_flag(TIF_PERFCTR)) {
 890                         current_thread_info()->user_cntd0 =
 891                                 current_thread_info()->user_cntd1 = NULL;
 892                         current_thread_info()->pcr_reg = 0;
 893                         write_pcr(0);
 894                         clear_thread_flag(TIF_PERFCTR);
 895                         err = 0;
 896                 }
 897                 break;
 898
 899         case PERFCTR_READ: {
 900                 unsigned long pic, tmp;
 901
 902                 if (!test_thread_flag(TIF_PERFCTR)) {
 903                         err = -EINVAL;
 904                         break;
 905                 }
 906                 read_pic(pic);
 907                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
 908                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
 909                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
 910                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
 911                 reset_pic();
 912                 break;
 913         }
 914
 915         case PERFCTR_CLRPIC:
 916                 if (!test_thread_flag(TIF_PERFCTR)) {
 917                         err = -EINVAL;
 918                         break;
 919                 }
 920                 current_thread_info()->kernel_cntd0 =
 921                         current_thread_info()->kernel_cntd1 = 0;
 922                 reset_pic();
 923                 break;
 924
 925         case PERFCTR_SETPCR: {
 926                 u64 __user *user_pcr = (u64 __user *)arg0;
 927
 928                 if (!test_thread_flag(TIF_PERFCTR)) {
 929                         err = -EINVAL;
 930                         break;
 931                 }
 932                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
 933                 write_pcr(current_thread_info()->pcr_reg);
 934                 current_thread_info()->kernel_cntd0 =
 935                         current_thread_info()->kernel_cntd1 = 0;
 936                 reset_pic();
 937                 break;
 938         }
 939
 940         case PERFCTR_GETPCR: {
 941                 u64 __user *user_pcr = (u64 __user *)arg0;
 942
 943                 if (!test_thread_flag(TIF_PERFCTR)) {
 944                         err = -EINVAL;
 945                         break;
 946                 }
 947                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
 948                 break;
 949         }
 950
 951         default:
 952                 err = -EINVAL;
 953                 break;
 954         };
 955         return err;
 956 }
 957
 958 /*
 959  * Do a system call from kernel instead of calling sys_execve so we
 960  * end up with proper pt_regs.
 961  */
 962 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 963 {
 964         long __res;
 965         register long __g1 __asm__ ("g1") = __NR_execve;
 966         register long __o0 __asm__ ("o0") = (long)(filename);
 967         register long __o1 __asm__ ("o1") = (long)(argv);
 968         register long __o2 __asm__ ("o2") = (long)(envp);
 969         asm volatile ("t 0x6d\n\t"
 970                       "sub %%g0, %%o0, %0\n\t"
 971                       "movcc %%xcc, %%o0, %0\n\t"
 972                       : "=r" (__res), "=&r" (__o0)
 973                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 974                       : "cc");
 975         return __res;
 976 }