arch/sparc/kernel/sys_sparc_64.c

   1 /* linux/arch/sparc64/kernel/sys_sparc.c
   2  *
   3  * This file contains various random system calls that
   4  * have a non-standard calling sequence on the Linux/sparc
   5  * platform.
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/sched.h>
  11 #include <linux/fs.h>
  12 #include <linux/file.h>
  13 #include <linux/mm.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/mman.h>
  19 #include <linux/utsname.h>
  20 #include <linux/smp.h>
  21 #include <linux/slab.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/ipc.h>
  24 #include <linux/personality.h>
  25 #include <linux/random.h>
  26 #include <linux/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
  37 asmlinkage unsigned long sys_getpagesize(void)
  38 {
  39         return PAGE_SIZE;
  40 }
  41
  42 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
  43  * overflow past the end of the 64-bit address space?
  44  */
  45 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  46 {
  47         unsigned long va_exclude_start, va_exclude_end;
  48
  49         va_exclude_start = VA_EXCLUDE_START;
  50         va_exclude_end   = VA_EXCLUDE_END;
  51
  52         if (unlikely(len >= va_exclude_start))
  53                 return 1;
  54
  55         if (unlikely((addr + len) < addr))
  56                 return 1;
  57
  58         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
  59                      ((addr + len) >= va_exclude_start &&
  60                       (addr + len) < va_exclude_end)))
  61                 return 1;
  62
  63         return 0;
  64 }
  65
  66 /* These functions differ from the default implementations in
  67  * mm/mmap.c in two ways:
  68  *
  69  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
  70  *    for fixed such mappings we just validate what the user gave us.
  71  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
  72  *    the spitfire/niagara VA-hole.
  73  */
  74
  75 static inline unsigned long COLOR_ALIGN(unsigned long addr,
  76                                          unsigned long pgoff)
  77 {
  78         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
  79         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
  80
  81         return base + off;
  82 }
  83
  84 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  85 {
  86         struct mm_struct *mm = current->mm;
  87         struct vm_area_struct * vma;
  88         unsigned long task_size = TASK_SIZE;
  89         int do_color_align;
  90         struct vm_unmapped_area_info info;
  91
  92         if (flags & MAP_FIXED) {
  93                 /* We do not accept a shared mapping if it would violate
  94                  * cache aliasing constraints.
  95                  */
  96                 if ((flags & MAP_SHARED) &&
  97                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
  98                         return -EINVAL;
  99                 return addr;
 100         }
 101
 102         if (test_thread_flag(TIF_32BIT))
 103                 task_size = STACK_TOP32;
 104         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 105                 return -ENOMEM;
 106
 107         do_color_align = 0;
 108         if (filp || (flags & MAP_SHARED))
 109                 do_color_align = 1;
 110
 111         if (addr) {
 112                 if (do_color_align)
 113                         addr = COLOR_ALIGN(addr, pgoff);
 114                 else
 115                         addr = PAGE_ALIGN(addr);
 116
 117                 vma = find_vma(mm, addr);
 118                 if (task_size - len >= addr &&
 119                     (!vma || addr + len <= vma->vm_start))
 120                         return addr;
 121         }
 122
 123         info.flags = 0;
 124         info.length = len;
 125         info.low_limit = TASK_UNMAPPED_BASE;
 126         info.high_limit = min(task_size, VA_EXCLUDE_START);
 127         info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 128         info.align_offset = pgoff << PAGE_SHIFT;
 129         addr = vm_unmapped_area(&info);
 130
 131         if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
 132                 VM_BUG_ON(addr != -ENOMEM);
 133                 info.low_limit = VA_EXCLUDE_END;
 134                 info.high_limit = task_size;
 135                 addr = vm_unmapped_area(&info);
 136         }
 137
 138         return addr;
 139 }
 140
 141 unsigned long
 142 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 143                           const unsigned long len, const unsigned long pgoff,
 144                           const unsigned long flags)
 145 {
 146         struct vm_area_struct *vma;
 147         struct mm_struct *mm = current->mm;
 148         unsigned long task_size = STACK_TOP32;
 149         unsigned long addr = addr0;
 150         int do_color_align;
 151         struct vm_unmapped_area_info info;
 152
 153         /* This should only ever run for 32-bit processes.  */
 154         BUG_ON(!test_thread_flag(TIF_32BIT));
 155
 156         if (flags & MAP_FIXED) {
 157                 /* We do not accept a shared mapping if it would violate
 158                  * cache aliasing constraints.
 159                  */
 160                 if ((flags & MAP_SHARED) &&
 161                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
 162                         return -EINVAL;
 163                 return addr;
 164         }
 165
 166         if (unlikely(len > task_size))
 167                 return -ENOMEM;
 168
 169         do_color_align = 0;
 170         if (filp || (flags & MAP_SHARED))
 171                 do_color_align = 1;
 172
 173         /* requesting a specific address */
 174         if (addr) {
 175                 if (do_color_align)
 176                         addr = COLOR_ALIGN(addr, pgoff);
 177                 else
 178                         addr = PAGE_ALIGN(addr);
 179
 180                 vma = find_vma(mm, addr);
 181                 if (task_size - len >= addr &&
 182                     (!vma || addr + len <= vma->vm_start))
 183                         return addr;
 184         }
 185
 186         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 187         info.length = len;
 188         info.low_limit = PAGE_SIZE;
 189         info.high_limit = mm->mmap_base;
 190         info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 191         info.align_offset = pgoff << PAGE_SHIFT;
 192         addr = vm_unmapped_area(&info);
 193
 194         /*
 195          * A failed mmap() very likely causes application failure,
 196          * so fall back to the bottom-up function here. This scenario
 197          * can happen with large stack limits and large mmap()
 198          * allocations.
 199          */
 200         if (addr & ~PAGE_MASK) {
 201                 VM_BUG_ON(addr != -ENOMEM);
 202                 info.flags = 0;
 203                 info.low_limit = TASK_UNMAPPED_BASE;
 204                 info.high_limit = STACK_TOP32;
 205                 addr = vm_unmapped_area(&info);
 206         }
 207
 208         return addr;
 209 }
 210
 211 /* Try to align mapping such that we align it as much as possible. */
 212 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 213 {
 214         unsigned long align_goal, addr = -ENOMEM;
 215         unsigned long (*get_area)(struct file *, unsigned long,
 216                                   unsigned long, unsigned long, unsigned long);
 217
 218         get_area = current->mm->get_unmapped_area;
 219
 220         if (flags & MAP_FIXED) {
 221                 /* Ok, don't mess with it. */
 222                 return get_area(NULL, orig_addr, len, pgoff, flags);
 223         }
 224         flags &= ~MAP_SHARED;
 225
 226         align_goal = PAGE_SIZE;
 227         if (len >= (4UL * 1024 * 1024))
 228                 align_goal = (4UL * 1024 * 1024);
 229         else if (len >= (512UL * 1024))
 230                 align_goal = (512UL * 1024);
 231         else if (len >= (64UL * 1024))
 232                 align_goal = (64UL * 1024);
 233
 234         do {
 235                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
 236                 if (!(addr & ~PAGE_MASK)) {
 237                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
 238                         break;
 239                 }
 240
 241                 if (align_goal == (4UL * 1024 * 1024))
 242                         align_goal = (512UL * 1024);
 243                 else if (align_goal == (512UL * 1024))
 244                         align_goal = (64UL * 1024);
 245                 else
 246                         align_goal = PAGE_SIZE;
 247         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
 248
 249         /* Mapping is smaller than 64K or larger areas could not
 250          * be obtained.
 251          */
 252         if (addr & ~PAGE_MASK)
 253                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
 254
 255         return addr;
 256 }
 257 EXPORT_SYMBOL(get_fb_unmapped_area);
 258
 259 /* Essentially the same as PowerPC.  */
 260 static unsigned long mmap_rnd(void)
 261 {
 262         unsigned long rnd = 0UL;
 263
 264         if (current->flags & PF_RANDOMIZE) {
 265                 unsigned long val = get_random_int();
 266                 if (test_thread_flag(TIF_32BIT))
 267                         rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
 268                 else
 269                         rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
 270         }
 271         return rnd << PAGE_SHIFT;
 272 }
 273
 274 void arch_pick_mmap_layout(struct mm_struct *mm)
 275 {
 276         unsigned long random_factor = mmap_rnd();
 277         unsigned long gap;
 278
 279         /*
 280          * Fall back to the standard layout if the personality
 281          * bit is set, or if the expected stack growth is unlimited:
 282          */
 283         gap = rlimit(RLIMIT_STACK);
 284         if (!test_thread_flag(TIF_32BIT) ||
 285             (current->personality & ADDR_COMPAT_LAYOUT) ||
 286             gap == RLIM_INFINITY ||
 287             sysctl_legacy_va_layout) {
 288                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
 289                 mm->get_unmapped_area = arch_get_unmapped_area;
 290         } else {
 291                 /* We know it's 32-bit */
 292                 unsigned long task_size = STACK_TOP32;
 293
 294                 if (gap < 128 * 1024 * 1024)
 295                         gap = 128 * 1024 * 1024;
 296                 if (gap > (task_size / 6 * 5))
 297                         gap = (task_size / 6 * 5);
 298
 299                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 300                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 301         }
 302 }
 303
 304 /*
 305  * sys_pipe() is the normal C calling standard for creating
 306  * a pipe. It's not the way unix traditionally does this, though.
 307  */
 308 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 309 {
 310         int fd[2];
 311         int error;
 312
 313         error = do_pipe_flags(fd, 0);
 314         if (error)
 315                 goto out;
 316         regs->u_regs[UREG_I1] = fd[1];
 317         error = fd[0];
 318 out:
 319         return error;
 320 }
 321
 322 /*
 323  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 324  *
 325  * This is really horribly ugly.
 326  */
 327
 328 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 329                 unsigned long, third, void __user *, ptr, long, fifth)
 330 {
 331         long err;
 332
 333         /* No need for backward compatibility. We can start fresh... */
 334         if (call <= SEMCTL) {
 335                 switch (call) {
 336                 case SEMOP:
 337                         err = sys_semtimedop(first, ptr,
 338                                              (unsigned)second, NULL);
 339                         goto out;
 340                 case SEMTIMEDOP:
 341                         err = sys_semtimedop(first, ptr, (unsigned)second,
 342                                 (const struct timespec __user *)
 343                                              (unsigned long) fifth);
 344                         goto out;
 345                 case SEMGET:
 346                         err = sys_semget(first, (int)second, (int)third);
 347                         goto out;
 348                 case SEMCTL: {
 349                         err = sys_semctl(first, second,
 350                                          (int)third | IPC_64,
 351                                          (unsigned long) ptr);
 352                         goto out;
 353                 }
 354                 default:
 355                         err = -ENOSYS;
 356                         goto out;
 357                 }
 358         }
 359         if (call <= MSGCTL) {
 360                 switch (call) {
 361                 case MSGSND:
 362                         err = sys_msgsnd(first, ptr, (size_t)second,
 363                                          (int)third);
 364                         goto out;
 365                 case MSGRCV:
 366                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 367                                          (int)third);
 368                         goto out;
 369                 case MSGGET:
 370                         err = sys_msgget((key_t)first, (int)second);
 371                         goto out;
 372                 case MSGCTL:
 373                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 374                         goto out;
 375                 default:
 376                         err = -ENOSYS;
 377                         goto out;
 378                 }
 379         }
 380         if (call <= SHMCTL) {
 381                 switch (call) {
 382                 case SHMAT: {
 383                         ulong raddr;
 384                         err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
 385                         if (!err) {
 386                                 if (put_user(raddr,
 387                                              (ulong __user *) third))
 388                                         err = -EFAULT;
 389                         }
 390                         goto out;
 391                 }
 392                 case SHMDT:
 393                         err = sys_shmdt(ptr);
 394                         goto out;
 395                 case SHMGET:
 396                         err = sys_shmget(first, (size_t)second, (int)third);
 397                         goto out;
 398                 case SHMCTL:
 399                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 400                         goto out;
 401                 default:
 402                         err = -ENOSYS;
 403                         goto out;
 404                 }
 405         } else {
 406                 err = -ENOSYS;
 407         }
 408 out:
 409         return err;
 410 }
 411
 412 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 413 {
 414         int ret;
 415
 416         if (personality(current->personality) == PER_LINUX32 &&
 417             personality(personality) == PER_LINUX)
 418                 personality |= PER_LINUX32;
 419         ret = sys_personality(personality);
 420         if (personality(ret) == PER_LINUX32)
 421                 ret &= ~PER_LINUX32;
 422
 423         return ret;
 424 }
 425
 426 int sparc_mmap_check(unsigned long addr, unsigned long len)
 427 {
 428         if (test_thread_flag(TIF_32BIT)) {
 429                 if (len >= STACK_TOP32)
 430                         return -EINVAL;
 431
 432                 if (addr > STACK_TOP32 - len)
 433                         return -EINVAL;
 434         } else {
 435                 if (len >= VA_EXCLUDE_START)
 436                         return -EINVAL;
 437
 438                 if (invalid_64bit_range(addr, len))
 439                         return -EINVAL;
 440         }
 441
 442         return 0;
 443 }
 444
 445 /* Linux version of mmap */
 446 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 447                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
 448                 unsigned long, off)
 449 {
 450         unsigned long retval = -EINVAL;
 451
 452         if ((off + PAGE_ALIGN(len)) < off)
 453                 goto out;
 454         if (off & ~PAGE_MASK)
 455                 goto out;
 456         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 457 out:
 458         return retval;
 459 }
 460
 461 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 462 {
 463         if (invalid_64bit_range(addr, len))
 464                 return -EINVAL;
 465
 466         return vm_munmap(addr, len);
 467 }
 468
 469 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 470                 unsigned long, new_len, unsigned long, flags,
 471                 unsigned long, new_addr)
 472 {
 473         if (test_thread_flag(TIF_32BIT))
 474                 return -EINVAL;
 475         return sys_mremap(addr, old_len, new_len, flags, new_addr);
 476 }
 477
 478 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 479 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 480 {
 481         static int count;
 482
 483         /* Don't make the system unusable, if someone goes stuck */
 484         if (count++ > 5)
 485                 return -ENOSYS;
 486
 487         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 488 #ifdef DEBUG_UNIMP_SYSCALL
 489         show_regs (regs);
 490 #endif
 491
 492         return -ENOSYS;
 493 }
 494
 495 /* #define DEBUG_SPARC_BREAKPOINT */
 496
 497 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 498 {
 499         siginfo_t info;
 500
 501         if (test_thread_flag(TIF_32BIT)) {
 502                 regs->tpc &= 0xffffffff;
 503                 regs->tnpc &= 0xffffffff;
 504         }
 505 #ifdef DEBUG_SPARC_BREAKPOINT
 506         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 507 #endif
 508         info.si_signo = SIGTRAP;
 509         info.si_errno = 0;
 510         info.si_code = TRAP_BRKPT;
 511         info.si_addr = (void __user *)regs->tpc;
 512         info.si_trapno = 0;
 513         force_sig_info(SIGTRAP, &info, current);
 514 #ifdef DEBUG_SPARC_BREAKPOINT
 515         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 516 #endif
 517 }
 518
 519 extern void check_pending(int signum);
 520
 521 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
 522 {
 523         int nlen, err;
 524
 525         if (len < 0)
 526                 return -EINVAL;
 527
 528         down_read(&uts_sem);
 529
 530         nlen = strlen(utsname()->domainname) + 1;
 531         err = -EINVAL;
 532         if (nlen > len)
 533                 goto out;
 534
 535         err = -EFAULT;
 536         if (!copy_to_user(name, utsname()->domainname, nlen))
 537                 err = 0;
 538
 539 out:
 540         up_read(&uts_sem);
 541         return err;
 542 }
 543
 544 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 545                 utrap_handler_t, new_p, utrap_handler_t, new_d,
 546                 utrap_handler_t __user *, old_p,
 547                 utrap_handler_t __user *, old_d)
 548 {
 549         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 550                 return -EINVAL;
 551         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
 552                 if (old_p) {
 553                         if (!current_thread_info()->utraps) {
 554                                 if (put_user(NULL, old_p))
 555                                         return -EFAULT;
 556                         } else {
 557                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 558                                         return -EFAULT;
 559                         }
 560                 }
 561                 if (old_d) {
 562                         if (put_user(NULL, old_d))
 563                                 return -EFAULT;
 564                 }
 565                 return 0;
 566         }
 567         if (!current_thread_info()->utraps) {
 568                 current_thread_info()->utraps =
 569                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 570                 if (!current_thread_info()->utraps)
 571                         return -ENOMEM;
 572                 current_thread_info()->utraps[0] = 1;
 573         } else {
 574                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 575                     current_thread_info()->utraps[0] > 1) {
 576                         unsigned long *p = current_thread_info()->utraps;
 577
 578                         current_thread_info()->utraps =
 579                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
 580                                         GFP_KERNEL);
 581                         if (!current_thread_info()->utraps) {
 582                                 current_thread_info()->utraps = p;
 583                                 return -ENOMEM;
 584                         }
 585                         p[0]--;
 586                         current_thread_info()->utraps[0] = 1;
 587                         memcpy(current_thread_info()->utraps+1, p+1,
 588                                UT_TRAP_INSTRUCTION_31*sizeof(long));
 589                 }
 590         }
 591         if (old_p) {
 592                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
 593                         return -EFAULT;
 594         }
 595         if (old_d) {
 596                 if (put_user(NULL, old_d))
 597                         return -EFAULT;
 598         }
 599         current_thread_info()->utraps[type] = (long)new_p;
 600
 601         return 0;
 602 }
 603
 604 asmlinkage long sparc_memory_ordering(unsigned long model,
 605                                       struct pt_regs *regs)
 606 {
 607         if (model >= 3)
 608                 return -EINVAL;
 609         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
 610         return 0;
 611 }
 612
 613 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 614                 struct sigaction __user *, oact, void __user *, restorer,
 615                 size_t, sigsetsize)
 616 {
 617         struct k_sigaction new_ka, old_ka;
 618         int ret;
 619
 620         /* XXX: Don't preclude handling different sized sigset_t's.  */
 621         if (sigsetsize != sizeof(sigset_t))
 622                 return -EINVAL;
 623
 624         if (act) {
 625                 new_ka.ka_restorer = restorer;
 626                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 627                         return -EFAULT;
 628         }
 629
 630         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 631
 632         if (!ret && oact) {
 633                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 634                         return -EFAULT;
 635         }
 636
 637         return ret;
 638 }
 639
 640 asmlinkage long sys_kern_features(void)
 641 {
 642         return KERN_FEATURE_MIXED_MODE_STACK;
 643 }