LXR linux/arch/sparc/kernel/sys_sparc

   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/unistd.h>
  31
  32#include "entry.h"
  33#include "systbls.h"
  34
  35/* #define DEBUG_UNIMP_SYSCALL */
  36
  37asmlinkage 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 */
  48static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  49{
  50        unsigned long va_exclude_start, va_exclude_end;
  51
  52        va_exclude_start = VA_EXCLUDE_START;
  53        va_exclude_end   = VA_EXCLUDE_END;
  54
  55        if (unlikely(len >= va_exclude_start))
  56                return 1;
  57
  58        if (unlikely((addr + len) < addr))
  59                return 1;
  60
  61        if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  62                     ((addr + len) >= va_exclude_start &&
  63                      (addr + len) < va_exclude_end)))
  64                return 1;
  65
  66        return 0;
  67}
  68
  69/* Does start,end straddle the VA-space hole?  */
  70static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
  71{
  72        unsigned long va_exclude_start, va_exclude_end;
  73
  74        va_exclude_start = VA_EXCLUDE_START;
  75        va_exclude_end   = VA_EXCLUDE_END;
  76
  77        if (likely(start < va_exclude_start && end < va_exclude_start))
  78                return 0;
  79
  80        if (likely(start >= va_exclude_end && end >= va_exclude_end))
  81                return 0;
  82
  83        return 1;
  84}
  85
  86/* These functions differ from the default implementations in
  87 * mm/mmap.c in two ways:
  88 *
  89 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  90 *    for fixed such mappings we just validate what the user gave us.
  91 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  92 *    the spitfire/niagara VA-hole.
  93 */
  94
  95static inline unsigned long COLOUR_ALIGN(unsigned long addr,
  96                                         unsigned long pgoff)
  97{
  98        unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  99        unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 100
 101        return base + off;
 102}
 103
 104static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
 105                                              unsigned long pgoff)
 106{
 107        unsigned long base = addr & ~(SHMLBA-1);
 108        unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
 109
 110        if (base + off <= addr)
 111                return base + off;
 112        return base - off;
 113}
 114
 115unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 116{
 117        struct mm_struct *mm = current->mm;
 118        struct vm_area_struct * vma;
 119        unsigned long task_size = TASK_SIZE;
 120        unsigned long start_addr;
 121        int do_color_align;
 122
 123        if (flags & MAP_FIXED) {
 124                /* We do not accept a shared mapping if it would violate
 125                 * cache aliasing constraints.
 126                 */
 127                if ((flags & MAP_SHARED) &&
 128                    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 129                        return -EINVAL;
 130                return addr;
 131        }
 132
 133        if (test_thread_flag(TIF_32BIT))
 134                task_size = STACK_TOP32;
 135        if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 136                return -ENOMEM;
 137
 138        do_color_align = 0;
 139        if (filp || (flags & MAP_SHARED))
 140                do_color_align = 1;
 141
 142        if (addr) {
 143                if (do_color_align)
 144                        addr = COLOUR_ALIGN(addr, pgoff);
 145                else
 146                        addr = PAGE_ALIGN(addr);
 147
 148                vma = find_vma(mm, addr);
 149                if (task_size - len >= addr &&
 150                    (!vma || addr + len <= vma->vm_start))
 151                        return addr;
 152        }
 153
 154        if (len > mm->cached_hole_size) {
 155                start_addr = addr = mm->free_area_cache;
 156        } else {
 157                start_addr = addr = TASK_UNMAPPED_BASE;
 158                mm->cached_hole_size = 0;
 159        }
 160
 161        task_size -= len;
 162
 163full_search:
 164        if (do_color_align)
 165                addr = COLOUR_ALIGN(addr, pgoff);
 166        else
 167                addr = PAGE_ALIGN(addr);
 168
 169        for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 170                /* At this point:  (!vma || addr < vma->vm_end). */
 171                if (addr < VA_EXCLUDE_START &&
 172                    (addr + len) >= VA_EXCLUDE_START) {
 173                        addr = VA_EXCLUDE_END;
 174                        vma = find_vma(mm, VA_EXCLUDE_END);
 175                }
 176                if (unlikely(task_size < addr)) {
 177                        if (start_addr != TASK_UNMAPPED_BASE) {
 178                                start_addr = addr = TASK_UNMAPPED_BASE;
 179                                mm->cached_hole_size = 0;
 180                                goto full_search;
 181                        }
 182                        return -ENOMEM;
 183                }
 184                if (likely(!vma || addr + len <= vma->vm_start)) {
 185                        /*
 186                         * Remember the place where we stopped the search:
 187                         */
 188                        mm->free_area_cache = addr + len;
 189                        return addr;
 190                }
 191                if (addr + mm->cached_hole_size < vma->vm_start)
 192                        mm->cached_hole_size = vma->vm_start - addr;
 193
 194                addr = vma->vm_end;
 195                if (do_color_align)
 196                        addr = COLOUR_ALIGN(addr, pgoff);
 197        }
 198}
 199
 200unsigned long
 201arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 202                          const unsigned long len, const unsigned long pgoff,
 203                          const unsigned long flags)
 204{
 205        struct vm_area_struct *vma;
 206        struct mm_struct *mm = current->mm;
 207        unsigned long task_size = STACK_TOP32;
 208        unsigned long addr = addr0;
 209        int do_color_align;
 210
 211        /* This should only ever run for 32-bit processes.  */
 212        BUG_ON(!test_thread_flag(TIF_32BIT));
 213
 214        if (flags & MAP_FIXED) {
 215                /* We do not accept a shared mapping if it would violate
 216                 * cache aliasing constraints.
 217                 */
 218                if ((flags & MAP_SHARED) &&
 219                    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 220                        return -EINVAL;
 221                return addr;
 222        }
 223
 224        if (unlikely(len > task_size))
 225                return -ENOMEM;
 226
 227        do_color_align = 0;
 228        if (filp || (flags & MAP_SHARED))
 229                do_color_align = 1;
 230
 231        /* requesting a specific address */
 232        if (addr) {
 233                if (do_color_align)
 234                        addr = COLOUR_ALIGN(addr, pgoff);
 235                else
 236                        addr = PAGE_ALIGN(addr);
 237
 238                vma = find_vma(mm, addr);
 239                if (task_size - len >= addr &&
 240                    (!vma || addr + len <= vma->vm_start))
 241                        return addr;
 242        }
 243
 244        /* check if free_area_cache is useful for us */
 245        if (len <= mm->cached_hole_size) {
 246                mm->cached_hole_size = 0;
 247                mm->free_area_cache = mm->mmap_base;
 248        }
 249
 250        /* either no address requested or can't fit in requested address hole */
 251        addr = mm->free_area_cache;
 252        if (do_color_align) {
 253                unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
 254
 255                addr = base + len;
 256        }
 257
 258        /* make sure it can fit in the remaining address space */
 259        if (likely(addr > len)) {
 260                vma = find_vma(mm, addr-len);
 261                if (!vma || addr <= vma->vm_start) {
 262                        /* remember the address as a hint for next time */
 263                        return (mm->free_area_cache = addr-len);
 264                }
 265        }
 266
 267        if (unlikely(mm->mmap_base < len))
 268                goto bottomup;
 269
 270        addr = mm->mmap_base-len;
 271        if (do_color_align)
 272                addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 273
 274        do {
 275                /*
 276                 * Lookup failure means no vma is above this address,
 277                 * else if new region fits below vma->vm_start,
 278                 * return with success:
 279                 */
 280                vma = find_vma(mm, addr);
 281                if (likely(!vma || addr+len <= vma->vm_start)) {
 282                        /* remember the address as a hint for next time */
 283                        return (mm->free_area_cache = addr);
 284                }
 285
 286                /* remember the largest hole we saw so far */
 287                if (addr + mm->cached_hole_size < vma->vm_start)
 288                        mm->cached_hole_size = vma->vm_start - addr;
 289
 290                /* try just below the current vma->vm_start */
 291                addr = vma->vm_start-len;
 292                if (do_color_align)
 293                        addr = COLOUR_ALIGN_DOWN(addr, pgoff);
 294        } while (likely(len < vma->vm_start));
 295
 296bottomup:
 297        /*
 298         * A failed mmap() very likely causes application failure,
 299         * so fall back to the bottom-up function here. This scenario
 300         * can happen with large stack limits and large mmap()
 301         * allocations.
 302         */
 303        mm->cached_hole_size = ~0UL;
 304        mm->free_area_cache = TASK_UNMAPPED_BASE;
 305        addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 306        /*
 307         * Restore the topdown base:
 308         */
 309        mm->free_area_cache = mm->mmap_base;
 310        mm->cached_hole_size = ~0UL;
 311
 312        return addr;
 313}
 314
 315/* Try to align mapping such that we align it as much as possible. */
 316unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 317{
 318        unsigned long align_goal, addr = -ENOMEM;
 319        unsigned long (*get_area)(struct file *, unsigned long,
 320                                  unsigned long, unsigned long, unsigned long);
 321
 322        get_area = current->mm->get_unmapped_area;
 323
 324        if (flags & MAP_FIXED) {
 325                /* Ok, don't mess with it. */
 326                return get_area(NULL, orig_addr, len, pgoff, flags);
 327        }
 328        flags &= ~MAP_SHARED;
 329
 330        align_goal = PAGE_SIZE;
 331        if (len >= (4UL * 1024 * 1024))
 332                align_goal = (4UL * 1024 * 1024);
 333        else if (len >= (512UL * 1024))
 334                align_goal = (512UL * 1024);
 335        else if (len >= (64UL * 1024))
 336                align_goal = (64UL * 1024);
 337
 338        do {
 339                addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 340                if (!(addr & ~PAGE_MASK)) {
 341                        addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 342                        break;
 343                }
 344
 345                if (align_goal == (4UL * 1024 * 1024))
 346                        align_goal = (512UL * 1024);
 347                else if (align_goal == (512UL * 1024))
 348                        align_goal = (64UL * 1024);
 349                else
 350                        align_goal = PAGE_SIZE;
 351        } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 352
 353        /* Mapping is smaller than 64K or larger areas could not
 354         * be obtained.
 355         */
 356        if (addr & ~PAGE_MASK)
 357                addr = get_area(NULL, orig_addr, len, pgoff, flags);
 358
 359        return addr;
 360}
 361EXPORT_SYMBOL(get_fb_unmapped_area);
 362
 363/* Essentially the same as PowerPC... */
 364void arch_pick_mmap_layout(struct mm_struct *mm)
 365{
 366        unsigned long random_factor = 0UL;
 367        unsigned long gap;
 368
 369        if (current->flags & PF_RANDOMIZE) {
 370                random_factor = get_random_int();
 371                if (test_thread_flag(TIF_32BIT))
 372                        random_factor &= ((1 * 1024 * 1024) - 1);
 373                else
 374                        random_factor = ((random_factor << PAGE_SHIFT) &
 375                                         0xffffffffUL);
 376        }
 377
 378        /*
 379         * Fall back to the standard layout if the personality
 380         * bit is set, or if the expected stack growth is unlimited:
 381         */
 382        gap = rlimit(RLIMIT_STACK);
 383        if (!test_thread_flag(TIF_32BIT) ||
 384            (current->personality & ADDR_COMPAT_LAYOUT) ||
 385            gap == RLIM_INFINITY ||
 386            sysctl_legacy_va_layout) {
 387                mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 388                mm->get_unmapped_area = arch_get_unmapped_area;
 389                mm->unmap_area = arch_unmap_area;
 390        } else {
 391                /* We know it's 32-bit */
 392                unsigned long task_size = STACK_TOP32;
 393
 394                if (gap < 128 * 1024 * 1024)
 395                        gap = 128 * 1024 * 1024;
 396                if (gap > (task_size / 6 * 5))
 397                        gap = (task_size / 6 * 5);
 398
 399                mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 400                mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 401                mm->unmap_area = arch_unmap_area_topdown;
 402        }
 403}
 404
 405/*
 406 * sys_pipe() is the normal C calling standard for creating
 407 * a pipe. It's not the way unix traditionally does this, though.
 408 */
 409SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 410{
 411        int fd[2];
 412        int error;
 413
 414        error = do_pipe_flags(fd, 0);
 415        if (error)
 416                goto out;
 417        regs->u_regs[UREG_I1] = fd[1];
 418        error = fd[0];
 419out:
 420        return error;
 421}
 422
 423/*
 424 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 425 *
 426 * This is really horribly ugly.
 427 */
 428
 429SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 430                unsigned long, third, void __user *, ptr, long, fifth)
 431{
 432        long err;
 433
 434        /* No need for backward compatibility. We can start fresh... */
 435        if (call <= SEMCTL) {
 436                switch (call) {
 437                case SEMOP:
 438                        err = sys_semtimedop(first, ptr,
 439                                             (unsigned)second, NULL);
 440                        goto out;
 441                case SEMTIMEDOP:
 442                        err = sys_semtimedop(first, ptr, (unsigned)second,
 443                                (const struct timespec __user *)
 444                                             (unsigned long) fifth);
 445                        goto out;
 446                case SEMGET:
 447                        err = sys_semget(first, (int)second, (int)third);
 448                        goto out;
 449                case SEMCTL: {
 450                        err = sys_semctl(first, second,
 451                                         (int)third | IPC_64,
 452                                         (union semun) ptr);
 453                        goto out;
 454                }
 455                default:
 456                        err = -ENOSYS;
 457                        goto out;
 458                };
 459        }
 460        if (call <= MSGCTL) {
 461                switch (call) {
 462                case MSGSND:
 463                        err = sys_msgsnd(first, ptr, (size_t)second,
 464                                         (int)third);
 465                        goto out;
 466                case MSGRCV:
 467                        err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 468                                         (int)third);
 469                        goto out;
 470                case MSGGET:
 471                        err = sys_msgget((key_t)first, (int)second);
 472                        goto out;
 473                case MSGCTL:
 474                        err = sys_msgctl(first, (int)second | IPC_64, ptr);
 475                        goto out;
 476                default:
 477                        err = -ENOSYS;
 478                        goto out;
 479                };
 480        }
 481        if (call <= SHMCTL) {
 482                switch (call) {
 483                case SHMAT: {
 484                        ulong raddr;
 485                        err = do_shmat(first, ptr, (int)second, &raddr);
 486                        if (!err) {
 487                                if (put_user(raddr,
 488                                             (ulong __user *) third))
 489                                        err = -EFAULT;
 490                        }
 491                        goto out;
 492                }
 493                case SHMDT:
 494                        err = sys_shmdt(ptr);
 495                        goto out;
 496                case SHMGET:
 497                        err = sys_shmget(first, (size_t)second, (int)third);
 498                        goto out;
 499                case SHMCTL:
 500                        err = sys_shmctl(first, (int)second | IPC_64, ptr);
 501                        goto out;
 502                default:
 503                        err = -ENOSYS;
 504                        goto out;
 505                };
 506        } else {
 507                err = -ENOSYS;
 508        }
 509out:
 510        return err;
 511}
 512
 513SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 514{
 515        int ret;
 516
 517        if (current->personality == PER_LINUX32 &&
 518            personality == PER_LINUX)
 519                personality = PER_LINUX32;
 520        ret = sys_personality(personality);
 521        if (ret == PER_LINUX32)
 522                ret = PER_LINUX;
 523
 524        return ret;
 525}
 526
 527int sparc_mmap_check(unsigned long addr, unsigned long len)
 528{
 529        if (test_thread_flag(TIF_32BIT)) {
 530                if (len >= STACK_TOP32)
 531                        return -EINVAL;
 532
 533                if (addr > STACK_TOP32 - len)
 534                        return -EINVAL;
 535        } else {
 536                if (len >= VA_EXCLUDE_START)
 537                        return -EINVAL;
 538
 539                if (invalid_64bit_range(addr, len))
 540                        return -EINVAL;
 541        }
 542
 543        return 0;
 544}
 545
 546/* Linux version of mmap */
 547SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 548                unsigned long, prot, unsigned long, flags, unsigned long, fd,
 549                unsigned long, off)
 550{
 551        unsigned long retval = -EINVAL;
 552
 553        if ((off + PAGE_ALIGN(len)) < off)
 554                goto out;
 555        if (off & ~PAGE_MASK)
 556                goto out;
 557        retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 558out:
 559        return retval;
 560}
 561
 562SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 563{
 564        long ret;
 565
 566        if (invalid_64bit_range(addr, len))
 567                return -EINVAL;
 568
 569        down_write(&current->mm->mmap_sem);
 570        ret = do_munmap(current->mm, addr, len);
 571        up_write(&current->mm->mmap_sem);
 572        return ret;
 573}
 574
 575extern unsigned long do_mremap(unsigned long addr,
 576        unsigned long old_len, unsigned long new_len,
 577        unsigned long flags, unsigned long new_addr);
 578                
 579SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 580                unsigned long, new_len, unsigned long, flags,
 581                unsigned long, new_addr)
 582{
 583        unsigned long ret = -EINVAL;
 584
 585        if (test_thread_flag(TIF_32BIT))
 586                goto out;
 587
 588        down_write(&current->mm->mmap_sem);
 589        ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 590        up_write(&current->mm->mmap_sem);
 591out:
 592        return ret;       
 593}
 594
 595/* we come to here via sys_nis_syscall so it can setup the regs argument */
 596asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 597{
 598        static int count;
 599        
 600        /* Don't make the system unusable, if someone goes stuck */
 601        if (count++ > 5)
 602                return -ENOSYS;
 603
 604        printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 605#ifdef DEBUG_UNIMP_SYSCALL      
 606        show_regs (regs);
 607#endif
 608
 609        return -ENOSYS;
 610}
 611
 612/* #define DEBUG_SPARC_BREAKPOINT */
 613
 614asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 615{
 616        siginfo_t info;
 617
 618        if (test_thread_flag(TIF_32BIT)) {
 619                regs->tpc &= 0xffffffff;
 620                regs->tnpc &= 0xffffffff;
 621        }
 622#ifdef DEBUG_SPARC_BREAKPOINT
 623        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 624#endif
 625        info.si_signo = SIGTRAP;
 626        info.si_errno = 0;
 627        info.si_code = TRAP_BRKPT;
 628        info.si_addr = (void __user *)regs->tpc;
 629        info.si_trapno = 0;
 630        force_sig_info(SIGTRAP, &info, current);
 631#ifdef DEBUG_SPARC_BREAKPOINT
 632        printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 633#endif
 634}
 635
 636extern void check_pending(int signum);
 637
 638SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 639{
 640        int nlen, err;
 641
 642        if (len < 0)
 643                return -EINVAL;
 644
 645        down_read(&uts_sem);
 646        
 647        nlen = strlen(utsname()->domainname) + 1;
 648        err = -EINVAL;
 649        if (nlen > len)
 650                goto out;
 651
 652        err = -EFAULT;
 653        if (!copy_to_user(name, utsname()->domainname, nlen))
 654                err = 0;
 655
 656out:
 657        up_read(&uts_sem);
 658        return err;
 659}
 660
 661SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 662                utrap_handler_t, new_p, utrap_handler_t, new_d,
 663                utrap_handler_t __user *, old_p,
 664                utrap_handler_t __user *, old_d)
 665{
 666        if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 667                return -EINVAL;
 668        if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 669                if (old_p) {
 670                        if (!current_thread_info()->utraps) {
 671                                if (put_user(NULL, old_p))
 672                                        return -EFAULT;
 673                        } else {
 674                                if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 675                                        return -EFAULT;
 676                        }
 677                }
 678                if (old_d) {
 679                        if (put_user(NULL, old_d))
 680                                return -EFAULT;
 681                }
 682                return 0;
 683        }
 684        if (!current_thread_info()->utraps) {
 685                current_thread_info()->utraps =
 686                        kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 687                if (!current_thread_info()->utraps)
 688                        return -ENOMEM;
 689                current_thread_info()->utraps[0] = 1;
 690        } else {
 691                if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 692                    current_thread_info()->utraps[0] > 1) {
 693                        unsigned long *p = current_thread_info()->utraps;
 694
 695                        current_thread_info()->utraps =
 696                                kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 697                                        GFP_KERNEL);
 698                        if (!current_thread_info()->utraps) {
 699                                current_thread_info()->utraps = p;
 700                                return -ENOMEM;
 701                        }
 702                        p[0]--;
 703                        current_thread_info()->utraps[0] = 1;
 704                        memcpy(current_thread_info()->utraps+1, p+1,
 705                               UT_TRAP_INSTRUCTION_31*sizeof(long));
 706                }
 707        }
 708        if (old_p) {
 709                if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 710                        return -EFAULT;
 711        }
 712        if (old_d) {
 713                if (put_user(NULL, old_d))
 714                        return -EFAULT;
 715        }
 716        current_thread_info()->utraps[type] = (long)new_p;
 717
 718        return 0;
 719}
 720
 721asmlinkage long sparc_memory_ordering(unsigned long model,
 722                                      struct pt_regs *regs)
 723{
 724        if (model >= 3)
 725                return -EINVAL;
 726        regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 727        return 0;
 728}
 729
 730SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 731                struct sigaction __user *, oact, void __user *, restorer,
 732                size_t, sigsetsize)
 733{
 734        struct k_sigaction new_ka, old_ka;
 735        int ret;
 736
 737        /* XXX: Don't preclude handling different sized sigset_t's.  */
 738        if (sigsetsize != sizeof(sigset_t))
 739                return -EINVAL;
 740
 741        if (act) {
 742                new_ka.ka_restorer = restorer;
 743                if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 744                        return -EFAULT;
 745        }
 746
 747        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 748
 749        if (!ret && oact) {
 750                if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 751                        return -EFAULT;
 752        }
 753
 754        return ret;
 755}
 756
 757/*
 758 * Do a system call from kernel instead of calling sys_execve so we
 759 * end up with proper pt_regs.
 760 */
 761int kernel_execve(const char *filename,
 762                  const char *const argv[],
 763                  const char *const envp[])
 764{
 765        long __res;
 766        register long __g1 __asm__ ("g1") = __NR_execve;
 767        register long __o0 __asm__ ("o0") = (long)(filename);
 768        register long __o1 __asm__ ("o1") = (long)(argv);
 769        register long __o2 __asm__ ("o2") = (long)(envp);
 770        asm volatile ("t 0x6d\n\t"
 771                      "sub %%g0, %%o0, %0\n\t"
 772                      "movcc %%xcc, %%o0, %0\n\t"
 773                      : "=r" (__res), "=&r" (__o0)
 774                      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 775                      : "cc");
 776        return __res;
 777}
 778