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/export.h>
  27
  28#include <asm/uaccess.h>
  29#include <asm/utrap.h>
  30#include <asm/unistd.h>
  31
  32#include "entry.h"
  33#include "systbls.h"
  34
  35/* #define DEBUG_UNIMP_SYSCALL */
  36
  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/* These functions differ from the default implementations in
  70 * mm/mmap.c in two ways:
  71 *
  72 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  73 *    for fixed such mappings we just validate what the user gave us.
  74 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  75 *    the spitfire/niagara VA-hole.
  76 */
  77
  78static inline unsigned long COLOR_ALIGN(unsigned long addr,
  79                                         unsigned long pgoff)
  80{
  81        unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  82        unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  83
  84        return base + off;
  85}
  86
  87unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  88{
  89        struct mm_struct *mm = current->mm;
  90        struct vm_area_struct * vma;
  91        unsigned long task_size = TASK_SIZE;
  92        int do_color_align;
  93        struct vm_unmapped_area_info info;
  94
  95        if (flags & MAP_FIXED) {
  96                /* We do not accept a shared mapping if it would violate
  97                 * cache aliasing constraints.
  98                 */
  99                if ((flags & MAP_SHARED) &&
 100                    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 101                        return -EINVAL;
 102                return addr;
 103        }
 104
 105        if (test_thread_flag(TIF_32BIT))
 106                task_size = STACK_TOP32;
 107        if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 108                return -ENOMEM;
 109
 110        do_color_align = 0;
 111        if (filp || (flags & MAP_SHARED))
 112                do_color_align = 1;
 113
 114        if (addr) {
 115                if (do_color_align)
 116                        addr = COLOR_ALIGN(addr, pgoff);
 117                else
 118                        addr = PAGE_ALIGN(addr);
 119
 120                vma = find_vma(mm, addr);
 121                if (task_size - len >= addr &&
 122                    (!vma || addr + len <= vma->vm_start))
 123                        return addr;
 124        }
 125
 126        info.flags = 0;
 127        info.length = len;
 128        info.low_limit = TASK_UNMAPPED_BASE;
 129        info.high_limit = min(task_size, VA_EXCLUDE_START);
 130        info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 131        info.align_offset = pgoff << PAGE_SHIFT;
 132        addr = vm_unmapped_area(&info);
 133
 134        if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
 135                VM_BUG_ON(addr != -ENOMEM);
 136                info.low_limit = VA_EXCLUDE_END;
 137                info.high_limit = task_size;
 138                addr = vm_unmapped_area(&info);
 139        }
 140
 141        return addr;
 142}
 143
 144unsigned long
 145arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 146                          const unsigned long len, const unsigned long pgoff,
 147                          const unsigned long flags)
 148{
 149        struct vm_area_struct *vma;
 150        struct mm_struct *mm = current->mm;
 151        unsigned long task_size = STACK_TOP32;
 152        unsigned long addr = addr0;
 153        int do_color_align;
 154        struct vm_unmapped_area_info info;
 155
 156        /* This should only ever run for 32-bit processes.  */
 157        BUG_ON(!test_thread_flag(TIF_32BIT));
 158
 159        if (flags & MAP_FIXED) {
 160                /* We do not accept a shared mapping if it would violate
 161                 * cache aliasing constraints.
 162                 */
 163                if ((flags & MAP_SHARED) &&
 164                    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 165                        return -EINVAL;
 166                return addr;
 167        }
 168
 169        if (unlikely(len > task_size))
 170                return -ENOMEM;
 171
 172        do_color_align = 0;
 173        if (filp || (flags & MAP_SHARED))
 174                do_color_align = 1;
 175
 176        /* requesting a specific address */
 177        if (addr) {
 178                if (do_color_align)
 179                        addr = COLOR_ALIGN(addr, pgoff);
 180                else
 181                        addr = PAGE_ALIGN(addr);
 182
 183                vma = find_vma(mm, addr);
 184                if (task_size - len >= addr &&
 185                    (!vma || addr + len <= vma->vm_start))
 186                        return addr;
 187        }
 188
 189        info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 190        info.length = len;
 191        info.low_limit = PAGE_SIZE;
 192        info.high_limit = mm->mmap_base;
 193        info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 194        info.align_offset = pgoff << PAGE_SHIFT;
 195        addr = vm_unmapped_area(&info);
 196
 197        /*
 198         * A failed mmap() very likely causes application failure,
 199         * so fall back to the bottom-up function here. This scenario
 200         * can happen with large stack limits and large mmap()
 201         * allocations.
 202         */
 203        if (addr & ~PAGE_MASK) {
 204                VM_BUG_ON(addr != -ENOMEM);
 205                info.flags = 0;
 206                info.low_limit = TASK_UNMAPPED_BASE;
 207                info.high_limit = STACK_TOP32;
 208                addr = vm_unmapped_area(&info);
 209        }
 210
 211        return addr;
 212}
 213
 214/* Try to align mapping such that we align it as much as possible. */
 215unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 216{
 217        unsigned long align_goal, addr = -ENOMEM;
 218        unsigned long (*get_area)(struct file *, unsigned long,
 219                                  unsigned long, unsigned long, unsigned long);
 220
 221        get_area = current->mm->get_unmapped_area;
 222
 223        if (flags & MAP_FIXED) {
 224                /* Ok, don't mess with it. */
 225                return get_area(NULL, orig_addr, len, pgoff, flags);
 226        }
 227        flags &= ~MAP_SHARED;
 228
 229        align_goal = PAGE_SIZE;
 230        if (len >= (4UL * 1024 * 1024))
 231                align_goal = (4UL * 1024 * 1024);
 232        else if (len >= (512UL * 1024))
 233                align_goal = (512UL * 1024);
 234        else if (len >= (64UL * 1024))
 235                align_goal = (64UL * 1024);
 236
 237        do {
 238                addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 239                if (!(addr & ~PAGE_MASK)) {
 240                        addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 241                        break;
 242                }
 243
 244                if (align_goal == (4UL * 1024 * 1024))
 245                        align_goal = (512UL * 1024);
 246                else if (align_goal == (512UL * 1024))
 247                        align_goal = (64UL * 1024);
 248                else
 249                        align_goal = PAGE_SIZE;
 250        } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 251
 252        /* Mapping is smaller than 64K or larger areas could not
 253         * be obtained.
 254         */
 255        if (addr & ~PAGE_MASK)
 256                addr = get_area(NULL, orig_addr, len, pgoff, flags);
 257
 258        return addr;
 259}
 260EXPORT_SYMBOL(get_fb_unmapped_area);
 261
 262/* Essentially the same as PowerPC.  */
 263static unsigned long mmap_rnd(void)
 264{
 265        unsigned long rnd = 0UL;
 266
 267        if (current->flags & PF_RANDOMIZE) {
 268                unsigned long val = get_random_long();
 269                if (test_thread_flag(TIF_32BIT))
 270                        rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
 271                else
 272                        rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
 273        }
 274        return rnd << PAGE_SHIFT;
 275}
 276
 277void arch_pick_mmap_layout(struct mm_struct *mm)
 278{
 279        unsigned long random_factor = mmap_rnd();
 280        unsigned long gap;
 281
 282        /*
 283         * Fall back to the standard layout if the personality
 284         * bit is set, or if the expected stack growth is unlimited:
 285         */
 286        gap = rlimit(RLIMIT_STACK);
 287        if (!test_thread_flag(TIF_32BIT) ||
 288            (current->personality & ADDR_COMPAT_LAYOUT) ||
 289            gap == RLIM_INFINITY ||
 290            sysctl_legacy_va_layout) {
 291                mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 292                mm->get_unmapped_area = arch_get_unmapped_area;
 293                mm->unmap_area = arch_unmap_area;
 294        } else {
 295                /* We know it's 32-bit */
 296                unsigned long task_size = STACK_TOP32;
 297
 298                if (gap < 128 * 1024 * 1024)
 299                        gap = 128 * 1024 * 1024;
 300                if (gap > (task_size / 6 * 5))
 301                        gap = (task_size / 6 * 5);
 302
 303                mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 304                mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 305                mm->unmap_area = arch_unmap_area_topdown;
 306        }
 307}
 308
 309/*
 310 * sys_pipe() is the normal C calling standard for creating
 311 * a pipe. It's not the way unix traditionally does this, though.
 312 */
 313SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 314{
 315        int fd[2];
 316        int error;
 317
 318        error = do_pipe_flags(fd, 0);
 319        if (error)
 320                goto out;
 321        regs->u_regs[UREG_I1] = fd[1];
 322        error = fd[0];
 323out:
 324        return error;
 325}
 326
 327/*
 328 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 329 *
 330 * This is really horribly ugly.
 331 */
 332
 333SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 334                unsigned long, third, void __user *, ptr, long, fifth)
 335{
 336        long err;
 337
 338        /* No need for backward compatibility. We can start fresh... */
 339        if (call <= SEMCTL) {
 340                switch (call) {
 341                case SEMOP:
 342                        err = sys_semtimedop(first, ptr,
 343                                             (unsigned)second, NULL);
 344                        goto out;
 345                case SEMTIMEDOP:
 346                        err = sys_semtimedop(first, ptr, (unsigned)second,
 347                                (const struct timespec __user *)
 348                                             (unsigned long) fifth);
 349                        goto out;
 350                case SEMGET:
 351                        err = sys_semget(first, (int)second, (int)third);
 352                        goto out;
 353                case SEMCTL: {
 354                        err = sys_semctl(first, second,
 355                                         (int)third | IPC_64,
 356                                         (unsigned long) ptr);
 357                        goto out;
 358                }
 359                default:
 360                        err = -ENOSYS;
 361                        goto out;
 362                }
 363        }
 364        if (call <= MSGCTL) {
 365                switch (call) {
 366                case MSGSND:
 367                        err = sys_msgsnd(first, ptr, (size_t)second,
 368                                         (int)third);
 369                        goto out;
 370                case MSGRCV:
 371                        err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 372                                         (int)third);
 373                        goto out;
 374                case MSGGET:
 375                        err = sys_msgget((key_t)first, (int)second);
 376                        goto out;
 377                case MSGCTL:
 378                        err = sys_msgctl(first, (int)second | IPC_64, ptr);
 379                        goto out;
 380                default:
 381                        err = -ENOSYS;
 382                        goto out;
 383                }
 384        }
 385        if (call <= SHMCTL) {
 386                switch (call) {
 387                case SHMAT: {
 388                        ulong raddr;
 389                        err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
 390                        if (!err) {
 391                                if (put_user(raddr,
 392                                             (ulong __user *) third))
 393                                        err = -EFAULT;
 394                        }
 395                        goto out;
 396                }
 397                case SHMDT:
 398                        err = sys_shmdt(ptr);
 399                        goto out;
 400                case SHMGET:
 401                        err = sys_shmget(first, (size_t)second, (int)third);
 402                        goto out;
 403                case SHMCTL:
 404                        err = sys_shmctl(first, (int)second | IPC_64, ptr);
 405                        goto out;
 406                default:
 407                        err = -ENOSYS;
 408                        goto out;
 409                }
 410        } else {
 411                err = -ENOSYS;
 412        }
 413out:
 414        return err;
 415}
 416
 417SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 418{
 419        int ret;
 420
 421        if (personality(current->personality) == PER_LINUX32 &&
 422            personality(personality) == PER_LINUX)
 423                personality |= PER_LINUX32;
 424        ret = sys_personality(personality);
 425        if (personality(ret) == PER_LINUX32)
 426                ret &= ~PER_LINUX32;
 427
 428        return ret;
 429}
 430
 431int sparc_mmap_check(unsigned long addr, unsigned long len)
 432{
 433        if (test_thread_flag(TIF_32BIT)) {
 434                if (len >= STACK_TOP32)
 435                        return -EINVAL;
 436
 437                if (addr > STACK_TOP32 - len)
 438                        return -EINVAL;
 439        } else {
 440                if (len >= VA_EXCLUDE_START)
 441                        return -EINVAL;
 442
 443                if (invalid_64bit_range(addr, len))
 444                        return -EINVAL;
 445        }
 446
 447        return 0;
 448}
 449
 450/* Linux version of mmap */
 451SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 452                unsigned long, prot, unsigned long, flags, unsigned long, fd,
 453                unsigned long, off)
 454{
 455        unsigned long retval = -EINVAL;
 456
 457        if ((off + PAGE_ALIGN(len)) < off)
 458                goto out;
 459        if (off & ~PAGE_MASK)
 460                goto out;
 461        retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 462out:
 463        return retval;
 464}
 465
 466SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 467{
 468        if (invalid_64bit_range(addr, len))
 469                return -EINVAL;
 470
 471        return vm_munmap(addr, len);
 472}
 473                
 474SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 475                unsigned long, new_len, unsigned long, flags,
 476                unsigned long, new_addr)
 477{
 478        if (test_thread_flag(TIF_32BIT))
 479                return -EINVAL;
 480        return sys_mremap(addr, old_len, new_len, flags, new_addr);
 481}
 482
 483/* we come to here via sys_nis_syscall so it can setup the regs argument */
 484asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 485{
 486        static int count;
 487        
 488        /* Don't make the system unusable, if someone goes stuck */
 489        if (count++ > 5)
 490                return -ENOSYS;
 491
 492        printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 493#ifdef DEBUG_UNIMP_SYSCALL      
 494        show_regs (regs);
 495#endif
 496
 497        return -ENOSYS;
 498}
 499
 500/* #define DEBUG_SPARC_BREAKPOINT */
 501
 502asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 503{
 504        siginfo_t info;
 505
 506        if (test_thread_flag(TIF_32BIT)) {
 507                regs->tpc &= 0xffffffff;
 508                regs->tnpc &= 0xffffffff;
 509        }
 510#ifdef DEBUG_SPARC_BREAKPOINT
 511        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 512#endif
 513        info.si_signo = SIGTRAP;
 514        info.si_errno = 0;
 515        info.si_code = TRAP_BRKPT;
 516        info.si_addr = (void __user *)regs->tpc;
 517        info.si_trapno = 0;
 518        force_sig_info(SIGTRAP, &info, current);
 519#ifdef DEBUG_SPARC_BREAKPOINT
 520        printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 521#endif
 522}
 523
 524extern void check_pending(int signum);
 525
 526SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 527{
 528        int nlen, err;
 529
 530        if (len < 0)
 531                return -EINVAL;
 532
 533        down_read(&uts_sem);
 534        
 535        nlen = strlen(utsname()->domainname) + 1;
 536        err = -EINVAL;
 537        if (nlen > len)
 538                goto out;
 539
 540        err = -EFAULT;
 541        if (!copy_to_user(name, utsname()->domainname, nlen))
 542                err = 0;
 543
 544out:
 545        up_read(&uts_sem);
 546        return err;
 547}
 548
 549SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 550                utrap_handler_t, new_p, utrap_handler_t, new_d,
 551                utrap_handler_t __user *, old_p,
 552                utrap_handler_t __user *, old_d)
 553{
 554        if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 555                return -EINVAL;
 556        if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 557                if (old_p) {
 558                        if (!current_thread_info()->utraps) {
 559                                if (put_user(NULL, old_p))
 560                                        return -EFAULT;
 561                        } else {
 562                                if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 563                                        return -EFAULT;
 564                        }
 565                }
 566                if (old_d) {
 567                        if (put_user(NULL, old_d))
 568                                return -EFAULT;
 569                }
 570                return 0;
 571        }
 572        if (!current_thread_info()->utraps) {
 573                current_thread_info()->utraps =
 574                        kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 575                if (!current_thread_info()->utraps)
 576                        return -ENOMEM;
 577                current_thread_info()->utraps[0] = 1;
 578        } else {
 579                if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 580                    current_thread_info()->utraps[0] > 1) {
 581                        unsigned long *p = current_thread_info()->utraps;
 582
 583                        current_thread_info()->utraps =
 584                                kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 585                                        GFP_KERNEL);
 586                        if (!current_thread_info()->utraps) {
 587                                current_thread_info()->utraps = p;
 588                                return -ENOMEM;
 589                        }
 590                        p[0]--;
 591                        current_thread_info()->utraps[0] = 1;
 592                        memcpy(current_thread_info()->utraps+1, p+1,
 593                               UT_TRAP_INSTRUCTION_31*sizeof(long));
 594                }
 595        }
 596        if (old_p) {
 597                if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 598                        return -EFAULT;
 599        }
 600        if (old_d) {
 601                if (put_user(NULL, old_d))
 602                        return -EFAULT;
 603        }
 604        current_thread_info()->utraps[type] = (long)new_p;
 605
 606        return 0;
 607}
 608
 609asmlinkage long sparc_memory_ordering(unsigned long model,
 610                                      struct pt_regs *regs)
 611{
 612        if (model >= 3)
 613                return -EINVAL;
 614        regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 615        return 0;
 616}
 617
 618SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 619                struct sigaction __user *, oact, void __user *, restorer,
 620                size_t, sigsetsize)
 621{
 622        struct k_sigaction new_ka, old_ka;
 623        int ret;
 624
 625        /* XXX: Don't preclude handling different sized sigset_t's.  */
 626        if (sigsetsize != sizeof(sigset_t))
 627                return -EINVAL;
 628
 629        if (act) {
 630                new_ka.ka_restorer = restorer;
 631                if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 632                        return -EFAULT;
 633        }
 634
 635        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 636
 637        if (!ret && oact) {
 638                if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 639                        return -EFAULT;
 640        }
 641
 642        return ret;
 643}
 644
 645asmlinkage long sys_kern_features(void)
 646{
 647        return KERN_FEATURE_MIXED_MODE_STACK;
 648}
 649