linux/arch/sparc/kernel/sys_sparc_64.c
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   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#include <linux/context_tracking.h>
  28
  29#include <asm/uaccess.h>
  30#include <asm/utrap.h>
  31#include <asm/unistd.h>
  32
  33#include "entry.h"
  34#include "kernel.h"
  35#include "systbls.h"
  36
  37/* #define DEBUG_UNIMP_SYSCALL */
  38
  39asmlinkage unsigned long sys_getpagesize(void)
  40{
  41        return PAGE_SIZE;
  42}
  43
  44/* Does addr --> addr+len fall within 4GB of the VA-space hole or
  45 * overflow past the end of the 64-bit address space?
  46 */
  47static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  48{
  49        unsigned long va_exclude_start, va_exclude_end;
  50
  51        va_exclude_start = VA_EXCLUDE_START;
  52        va_exclude_end   = VA_EXCLUDE_END;
  53
  54        if (unlikely(len >= va_exclude_start))
  55                return 1;
  56
  57        if (unlikely((addr + len) < addr))
  58                return 1;
  59
  60        if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  61                     ((addr + len) >= va_exclude_start &&
  62                      (addr + len) < va_exclude_end)))
  63                return 1;
  64
  65        return 0;
  66}
  67
  68/* These functions differ from the default implementations in
  69 * mm/mmap.c in two ways:
  70 *
  71 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  72 *    for fixed such mappings we just validate what the user gave us.
  73 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  74 *    the spitfire/niagara VA-hole.
  75 */
  76
  77static inline unsigned long COLOR_ALIGN(unsigned long addr,
  78                                         unsigned long pgoff)
  79{
  80        unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  81        unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  82
  83        return base + off;
  84}
  85
  86unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  87{
  88        struct mm_struct *mm = current->mm;
  89        struct vm_area_struct * vma;
  90        unsigned long task_size = TASK_SIZE;
  91        int do_color_align;
  92        struct vm_unmapped_area_info info;
  93
  94        if (flags & MAP_FIXED) {
  95                /* We do not accept a shared mapping if it would violate
  96                 * cache aliasing constraints.
  97                 */
  98                if ((flags & MAP_SHARED) &&
  99                    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 100                        return -EINVAL;
 101                return addr;
 102        }
 103
 104        if (test_thread_flag(TIF_32BIT))
 105                task_size = STACK_TOP32;
 106        if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 107                return -ENOMEM;
 108
 109        do_color_align = 0;
 110        if (filp || (flags & MAP_SHARED))
 111                do_color_align = 1;
 112
 113        if (addr) {
 114                if (do_color_align)
 115                        addr = COLOR_ALIGN(addr, pgoff);
 116                else
 117                        addr = PAGE_ALIGN(addr);
 118
 119                vma = find_vma(mm, addr);
 120                if (task_size - len >= addr &&
 121                    (!vma || addr + len <= vma->vm_start))
 122                        return addr;
 123        }
 124
 125        info.flags = 0;
 126        info.length = len;
 127        info.low_limit = TASK_UNMAPPED_BASE;
 128        info.high_limit = min(task_size, VA_EXCLUDE_START);
 129        info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 130        info.align_offset = pgoff << PAGE_SHIFT;
 131        addr = vm_unmapped_area(&info);
 132
 133        if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
 134                VM_BUG_ON(addr != -ENOMEM);
 135                info.low_limit = VA_EXCLUDE_END;
 136                info.high_limit = task_size;
 137                addr = vm_unmapped_area(&info);
 138        }
 139
 140        return addr;
 141}
 142
 143unsigned long
 144arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 145                          const unsigned long len, const unsigned long pgoff,
 146                          const unsigned long flags)
 147{
 148        struct vm_area_struct *vma;
 149        struct mm_struct *mm = current->mm;
 150        unsigned long task_size = STACK_TOP32;
 151        unsigned long addr = addr0;
 152        int do_color_align;
 153        struct vm_unmapped_area_info info;
 154
 155        /* This should only ever run for 32-bit processes.  */
 156        BUG_ON(!test_thread_flag(TIF_32BIT));
 157
 158        if (flags & MAP_FIXED) {
 159                /* We do not accept a shared mapping if it would violate
 160                 * cache aliasing constraints.
 161                 */
 162                if ((flags & MAP_SHARED) &&
 163                    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 164                        return -EINVAL;
 165                return addr;
 166        }
 167
 168        if (unlikely(len > task_size))
 169                return -ENOMEM;
 170
 171        do_color_align = 0;
 172        if (filp || (flags & MAP_SHARED))
 173                do_color_align = 1;
 174
 175        /* requesting a specific address */
 176        if (addr) {
 177                if (do_color_align)
 178                        addr = COLOR_ALIGN(addr, pgoff);
 179                else
 180                        addr = PAGE_ALIGN(addr);
 181
 182                vma = find_vma(mm, addr);
 183                if (task_size - len >= addr &&
 184                    (!vma || addr + len <= vma->vm_start))
 185                        return addr;
 186        }
 187
 188        info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 189        info.length = len;
 190        info.low_limit = PAGE_SIZE;
 191        info.high_limit = mm->mmap_base;
 192        info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 193        info.align_offset = pgoff << PAGE_SHIFT;
 194        addr = vm_unmapped_area(&info);
 195
 196        /*
 197         * A failed mmap() very likely causes application failure,
 198         * so fall back to the bottom-up function here. This scenario
 199         * can happen with large stack limits and large mmap()
 200         * allocations.
 201         */
 202        if (addr & ~PAGE_MASK) {
 203                VM_BUG_ON(addr != -ENOMEM);
 204                info.flags = 0;
 205                info.low_limit = TASK_UNMAPPED_BASE;
 206                info.high_limit = STACK_TOP32;
 207                addr = vm_unmapped_area(&info);
 208        }
 209
 210        return addr;
 211}
 212
 213/* Try to align mapping such that we align it as much as possible. */
 214unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 215{
 216        unsigned long align_goal, addr = -ENOMEM;
 217        unsigned long (*get_area)(struct file *, unsigned long,
 218                                  unsigned long, unsigned long, unsigned long);
 219
 220        get_area = current->mm->get_unmapped_area;
 221
 222        if (flags & MAP_FIXED) {
 223                /* Ok, don't mess with it. */
 224                return get_area(NULL, orig_addr, len, pgoff, flags);
 225        }
 226        flags &= ~MAP_SHARED;
 227
 228        align_goal = PAGE_SIZE;
 229        if (len >= (4UL * 1024 * 1024))
 230                align_goal = (4UL * 1024 * 1024);
 231        else if (len >= (512UL * 1024))
 232                align_goal = (512UL * 1024);
 233        else if (len >= (64UL * 1024))
 234                align_goal = (64UL * 1024);
 235
 236        do {
 237                addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 238                if (!(addr & ~PAGE_MASK)) {
 239                        addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 240                        break;
 241                }
 242
 243                if (align_goal == (4UL * 1024 * 1024))
 244                        align_goal = (512UL * 1024);
 245                else if (align_goal == (512UL * 1024))
 246                        align_goal = (64UL * 1024);
 247                else
 248                        align_goal = PAGE_SIZE;
 249        } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 250
 251        /* Mapping is smaller than 64K or larger areas could not
 252         * be obtained.
 253         */
 254        if (addr & ~PAGE_MASK)
 255                addr = get_area(NULL, orig_addr, len, pgoff, flags);
 256
 257        return addr;
 258}
 259EXPORT_SYMBOL(get_fb_unmapped_area);
 260
 261/* Essentially the same as PowerPC.  */
 262static unsigned long mmap_rnd(void)
 263{
 264        unsigned long rnd = 0UL;
 265
 266        if (current->flags & PF_RANDOMIZE) {
 267                unsigned long val = get_random_int();
 268                if (test_thread_flag(TIF_32BIT))
 269                        rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
 270                else
 271                        rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
 272        }
 273        return rnd << PAGE_SHIFT;
 274}
 275
 276void arch_pick_mmap_layout(struct mm_struct *mm)
 277{
 278        unsigned long random_factor = mmap_rnd();
 279        unsigned long gap;
 280
 281        /*
 282         * Fall back to the standard layout if the personality
 283         * bit is set, or if the expected stack growth is unlimited:
 284         */
 285        gap = rlimit(RLIMIT_STACK);
 286        if (!test_thread_flag(TIF_32BIT) ||
 287            (current->personality & ADDR_COMPAT_LAYOUT) ||
 288            gap == RLIM_INFINITY ||
 289            sysctl_legacy_va_layout) {
 290                mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 291                mm->get_unmapped_area = arch_get_unmapped_area;
 292        } else {
 293                /* We know it's 32-bit */
 294                unsigned long task_size = STACK_TOP32;
 295
 296                if (gap < 128 * 1024 * 1024)
 297                        gap = 128 * 1024 * 1024;
 298                if (gap > (task_size / 6 * 5))
 299                        gap = (task_size / 6 * 5);
 300
 301                mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 302                mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 303        }
 304}
 305
 306/*
 307 * sys_pipe() is the normal C calling standard for creating
 308 * a pipe. It's not the way unix traditionally does this, though.
 309 */
 310SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 311{
 312        int fd[2];
 313        int error;
 314
 315        error = do_pipe_flags(fd, 0);
 316        if (error)
 317                goto out;
 318        regs->u_regs[UREG_I1] = fd[1];
 319        error = fd[0];
 320out:
 321        return error;
 322}
 323
 324/*
 325 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 326 *
 327 * This is really horribly ugly.
 328 */
 329
 330SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 331                unsigned long, third, void __user *, ptr, long, fifth)
 332{
 333        long err;
 334
 335        /* No need for backward compatibility. We can start fresh... */
 336        if (call <= SEMTIMEDOP) {
 337                switch (call) {
 338                case SEMOP:
 339                        err = sys_semtimedop(first, ptr,
 340                                             (unsigned)second, NULL);
 341                        goto out;
 342                case SEMTIMEDOP:
 343                        err = sys_semtimedop(first, ptr, (unsigned)second,
 344                                (const struct timespec __user *)
 345                                             (unsigned long) fifth);
 346                        goto out;
 347                case SEMGET:
 348                        err = sys_semget(first, (int)second, (int)third);
 349                        goto out;
 350                case SEMCTL: {
 351                        err = sys_semctl(first, second,
 352                                         (int)third | IPC_64,
 353                                         (unsigned long) ptr);
 354                        goto out;
 355                }
 356                default:
 357                        err = -ENOSYS;
 358                        goto out;
 359                }
 360        }
 361        if (call <= MSGCTL) {
 362                switch (call) {
 363                case MSGSND:
 364                        err = sys_msgsnd(first, ptr, (size_t)second,
 365                                         (int)third);
 366                        goto out;
 367                case MSGRCV:
 368                        err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 369                                         (int)third);
 370                        goto out;
 371                case MSGGET:
 372                        err = sys_msgget((key_t)first, (int)second);
 373                        goto out;
 374                case MSGCTL:
 375                        err = sys_msgctl(first, (int)second | IPC_64, ptr);
 376                        goto out;
 377                default:
 378                        err = -ENOSYS;
 379                        goto out;
 380                }
 381        }
 382        if (call <= SHMCTL) {
 383                switch (call) {
 384                case SHMAT: {
 385                        ulong raddr;
 386                        err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
 387                        if (!err) {
 388                                if (put_user(raddr,
 389                                             (ulong __user *) third))
 390                                        err = -EFAULT;
 391                        }
 392                        goto out;
 393                }
 394                case SHMDT:
 395                        err = sys_shmdt(ptr);
 396                        goto out;
 397                case SHMGET:
 398                        err = sys_shmget(first, (size_t)second, (int)third);
 399                        goto out;
 400                case SHMCTL:
 401                        err = sys_shmctl(first, (int)second | IPC_64, ptr);
 402                        goto out;
 403                default:
 404                        err = -ENOSYS;
 405                        goto out;
 406                }
 407        } else {
 408                err = -ENOSYS;
 409        }
 410out:
 411        return err;
 412}
 413
 414SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 415{
 416        int ret;
 417
 418        if (personality(current->personality) == PER_LINUX32 &&
 419            personality(personality) == PER_LINUX)
 420                personality |= PER_LINUX32;
 421        ret = sys_personality(personality);
 422        if (personality(ret) == PER_LINUX32)
 423                ret &= ~PER_LINUX32;
 424
 425        return ret;
 426}
 427
 428int sparc_mmap_check(unsigned long addr, unsigned long len)
 429{
 430        if (test_thread_flag(TIF_32BIT)) {
 431                if (len >= STACK_TOP32)
 432                        return -EINVAL;
 433
 434                if (addr > STACK_TOP32 - len)
 435                        return -EINVAL;
 436        } else {
 437                if (len >= VA_EXCLUDE_START)
 438                        return -EINVAL;
 439
 440                if (invalid_64bit_range(addr, len))
 441                        return -EINVAL;
 442        }
 443
 444        return 0;
 445}
 446
 447/* Linux version of mmap */
 448SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 449                unsigned long, prot, unsigned long, flags, unsigned long, fd,
 450                unsigned long, off)
 451{
 452        unsigned long retval = -EINVAL;
 453
 454        if ((off + PAGE_ALIGN(len)) < off)
 455                goto out;
 456        if (off & ~PAGE_MASK)
 457                goto out;
 458        retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 459out:
 460        return retval;
 461}
 462
 463SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 464{
 465        if (invalid_64bit_range(addr, len))
 466                return -EINVAL;
 467
 468        return vm_munmap(addr, len);
 469}
 470                
 471SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 472                unsigned long, new_len, unsigned long, flags,
 473                unsigned long, new_addr)
 474{
 475        if (test_thread_flag(TIF_32BIT))
 476                return -EINVAL;
 477        return sys_mremap(addr, old_len, new_len, flags, new_addr);
 478}
 479
 480/* we come to here via sys_nis_syscall so it can setup the regs argument */
 481asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 482{
 483        static int count;
 484        
 485        /* Don't make the system unusable, if someone goes stuck */
 486        if (count++ > 5)
 487                return -ENOSYS;
 488
 489        printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 490#ifdef DEBUG_UNIMP_SYSCALL      
 491        show_regs (regs);
 492#endif
 493
 494        return -ENOSYS;
 495}
 496
 497/* #define DEBUG_SPARC_BREAKPOINT */
 498
 499asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 500{
 501        enum ctx_state prev_state = exception_enter();
 502        siginfo_t info;
 503
 504        if (test_thread_flag(TIF_32BIT)) {
 505                regs->tpc &= 0xffffffff;
 506                regs->tnpc &= 0xffffffff;
 507        }
 508#ifdef DEBUG_SPARC_BREAKPOINT
 509        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 510#endif
 511        info.si_signo = SIGTRAP;
 512        info.si_errno = 0;
 513        info.si_code = TRAP_BRKPT;
 514        info.si_addr = (void __user *)regs->tpc;
 515        info.si_trapno = 0;
 516        force_sig_info(SIGTRAP, &info, current);
 517#ifdef DEBUG_SPARC_BREAKPOINT
 518        printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 519#endif
 520        exception_exit(prev_state);
 521}
 522
 523extern void check_pending(int signum);
 524
 525SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 526{
 527        int nlen, err;
 528
 529        if (len < 0)
 530                return -EINVAL;
 531
 532        down_read(&uts_sem);
 533        
 534        nlen = strlen(utsname()->domainname) + 1;
 535        err = -EINVAL;
 536        if (nlen > len)
 537                goto out;
 538
 539        err = -EFAULT;
 540        if (!copy_to_user(name, utsname()->domainname, nlen))
 541                err = 0;
 542
 543out:
 544        up_read(&uts_sem);
 545        return err;
 546}
 547
 548SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 549                utrap_handler_t, new_p, utrap_handler_t, new_d,
 550                utrap_handler_t __user *, old_p,
 551                utrap_handler_t __user *, old_d)
 552{
 553        if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 554                return -EINVAL;
 555        if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 556                if (old_p) {
 557                        if (!current_thread_info()->utraps) {
 558                                if (put_user(NULL, old_p))
 559                                        return -EFAULT;
 560                        } else {
 561                                if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 562                                        return -EFAULT;
 563                        }
 564                }
 565                if (old_d) {
 566                        if (put_user(NULL, old_d))
 567                                return -EFAULT;
 568                }
 569                return 0;
 570        }
 571        if (!current_thread_info()->utraps) {
 572                current_thread_info()->utraps =
 573                        kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 574                if (!current_thread_info()->utraps)
 575                        return -ENOMEM;
 576                current_thread_info()->utraps[0] = 1;
 577        } else {
 578                if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 579                    current_thread_info()->utraps[0] > 1) {
 580                        unsigned long *p = current_thread_info()->utraps;
 581
 582                        current_thread_info()->utraps =
 583                                kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 584                                        GFP_KERNEL);
 585                        if (!current_thread_info()->utraps) {
 586                                current_thread_info()->utraps = p;
 587                                return -ENOMEM;
 588                        }
 589                        p[0]--;
 590                        current_thread_info()->utraps[0] = 1;
 591                        memcpy(current_thread_info()->utraps+1, p+1,
 592                               UT_TRAP_INSTRUCTION_31*sizeof(long));
 593                }
 594        }
 595        if (old_p) {
 596                if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 597                        return -EFAULT;
 598        }
 599        if (old_d) {
 600                if (put_user(NULL, old_d))
 601                        return -EFAULT;
 602        }
 603        current_thread_info()->utraps[type] = (long)new_p;
 604
 605        return 0;
 606}
 607
 608asmlinkage long sparc_memory_ordering(unsigned long model,
 609                                      struct pt_regs *regs)
 610{
 611        if (model >= 3)
 612                return -EINVAL;
 613        regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 614        return 0;
 615}
 616
 617SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 618                struct sigaction __user *, oact, void __user *, restorer,
 619                size_t, sigsetsize)
 620{
 621        struct k_sigaction new_ka, old_ka;
 622        int ret;
 623
 624        /* XXX: Don't preclude handling different sized sigset_t's.  */
 625        if (sigsetsize != sizeof(sigset_t))
 626                return -EINVAL;
 627
 628        if (act) {
 629                new_ka.ka_restorer = restorer;
 630                if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 631                        return -EFAULT;
 632        }
 633
 634        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 635
 636        if (!ret && oact) {
 637                if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 638                        return -EFAULT;
 639        }
 640
 641        return ret;
 642}
 643
 644asmlinkage long sys_kern_features(void)
 645{
 646        return KERN_FEATURE_MIXED_MODE_STACK;
 647}
 648