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/signal.h>
  11 #include <linux/sched/mm.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/mm.h>
  15 #include <linux/sem.h>
  16 #include <linux/msg.h>
  17 #include <linux/shm.h>
  18 #include <linux/stat.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/slab.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/ipc.h>
  25 #include <linux/personality.h>
  26 #include <linux/random.h>
  27 #include <linux/export.h>
  28 #include <linux/context_tracking.h>
  29
  30 #include <linux/uaccess.h>
  31 #include <asm/utrap.h>
  32 #include <asm/unistd.h>
  33
  34 #include "entry.h"
  35 #include "kernel.h"
  36 #include "systbls.h"
  37
  38 /* #define DEBUG_UNIMP_SYSCALL */
  39
  40 asmlinkage unsigned long sys_getpagesize(void)
  41 {
  42         return PAGE_SIZE;
  43 }
  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  */
  48 static 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
  78 static 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
  87 unsigned 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
 144 unsigned long
 145 arch_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. */
 215 unsigned 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 }
 260 EXPORT_SYMBOL(get_fb_unmapped_area);
 261
 262 /* Essentially the same as PowerPC.  */
 263 static 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
 277 void 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         } else {
 294                 /* We know it's 32-bit */
 295                 unsigned long task_size = STACK_TOP32;
 296
 297                 if (gap < 128 * 1024 * 1024)
 298                         gap = 128 * 1024 * 1024;
 299                 if (gap > (task_size / 6 * 5))
 300                         gap = (task_size / 6 * 5);
 301
 302                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
 303                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 304         }
 305 }
 306
 307 /*
 308  * sys_pipe() is the normal C calling standard for creating
 309  * a pipe. It's not the way unix traditionally does this, though.
 310  */
 311 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
 312 {
 313         int fd[2];
 314         int error;
 315
 316         error = do_pipe_flags(fd, 0);
 317         if (error)
 318                 goto out;
 319         regs->u_regs[UREG_I1] = fd[1];
 320         error = fd[0];
 321 out:
 322         return error;
 323 }
 324
 325 /*
 326  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 327  *
 328  * This is really horribly ugly.
 329  */
 330
 331 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
 332                 unsigned long, third, void __user *, ptr, long, fifth)
 333 {
 334         long err;
 335
 336         /* No need for backward compatibility. We can start fresh... */
 337         if (call <= SEMTIMEDOP) {
 338                 switch (call) {
 339                 case SEMOP:
 340                         err = sys_semtimedop(first, ptr,
 341                                              (unsigned int)second, NULL);
 342                         goto out;
 343                 case SEMTIMEDOP:
 344                         err = sys_semtimedop(first, ptr, (unsigned int)second,
 345                                 (const struct timespec __user *)
 346                                              (unsigned long) fifth);
 347                         goto out;
 348                 case SEMGET:
 349                         err = sys_semget(first, (int)second, (int)third);
 350                         goto out;
 351                 case SEMCTL: {
 352                         err = sys_semctl(first, second,
 353                                          (int)third | IPC_64,
 354                                          (unsigned long) ptr);
 355                         goto out;
 356                 }
 357                 default:
 358                         err = -ENOSYS;
 359                         goto out;
 360                 }
 361         }
 362         if (call <= MSGCTL) {
 363                 switch (call) {
 364                 case MSGSND:
 365                         err = sys_msgsnd(first, ptr, (size_t)second,
 366                                          (int)third);
 367                         goto out;
 368                 case MSGRCV:
 369                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
 370                                          (int)third);
 371                         goto out;
 372                 case MSGGET:
 373                         err = sys_msgget((key_t)first, (int)second);
 374                         goto out;
 375                 case MSGCTL:
 376                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
 377                         goto out;
 378                 default:
 379                         err = -ENOSYS;
 380                         goto out;
 381                 }
 382         }
 383         if (call <= SHMCTL) {
 384                 switch (call) {
 385                 case SHMAT: {
 386                         ulong raddr;
 387                         err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
 388                         if (!err) {
 389                                 if (put_user(raddr,
 390                                              (ulong __user *) third))
 391                                         err = -EFAULT;
 392                         }
 393                         goto out;
 394                 }
 395                 case SHMDT:
 396                         err = sys_shmdt(ptr);
 397                         goto out;
 398                 case SHMGET:
 399                         err = sys_shmget(first, (size_t)second, (int)third);
 400                         goto out;
 401                 case SHMCTL:
 402                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
 403                         goto out;
 404                 default:
 405                         err = -ENOSYS;
 406                         goto out;
 407                 }
 408         } else {
 409                 err = -ENOSYS;
 410         }
 411 out:
 412         return err;
 413 }
 414
 415 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
 416 {
 417         long ret;
 418
 419         if (personality(current->personality) == PER_LINUX32 &&
 420             personality(personality) == PER_LINUX)
 421                 personality |= PER_LINUX32;
 422         ret = sys_personality(personality);
 423         if (personality(ret) == PER_LINUX32)
 424                 ret &= ~PER_LINUX32;
 425
 426         return ret;
 427 }
 428
 429 int sparc_mmap_check(unsigned long addr, unsigned long len)
 430 {
 431         if (test_thread_flag(TIF_32BIT)) {
 432                 if (len >= STACK_TOP32)
 433                         return -EINVAL;
 434
 435                 if (addr > STACK_TOP32 - len)
 436                         return -EINVAL;
 437         } else {
 438                 if (len >= VA_EXCLUDE_START)
 439                         return -EINVAL;
 440
 441                 if (invalid_64bit_range(addr, len))
 442                         return -EINVAL;
 443         }
 444
 445         return 0;
 446 }
 447
 448 /* Linux version of mmap */
 449 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 450                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
 451                 unsigned long, off)
 452 {
 453         unsigned long retval = -EINVAL;
 454
 455         if ((off + PAGE_ALIGN(len)) < off)
 456                 goto out;
 457         if (off & ~PAGE_MASK)
 458                 goto out;
 459         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 460 out:
 461         return retval;
 462 }
 463
 464 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 465 {
 466         if (invalid_64bit_range(addr, len))
 467                 return -EINVAL;
 468
 469         return vm_munmap(addr, len);
 470 }
 471
 472 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
 473                 unsigned long, new_len, unsigned long, flags,
 474                 unsigned long, new_addr)
 475 {
 476         if (test_thread_flag(TIF_32BIT))
 477                 return -EINVAL;
 478         return sys_mremap(addr, old_len, new_len, flags, new_addr);
 479 }
 480
 481 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 482 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 483 {
 484         static int count;
 485
 486         /* Don't make the system unusable, if someone goes stuck */
 487         if (count++ > 5)
 488                 return -ENOSYS;
 489
 490         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
 491 #ifdef DEBUG_UNIMP_SYSCALL
 492         show_regs (regs);
 493 #endif
 494
 495         return -ENOSYS;
 496 }
 497
 498 /* #define DEBUG_SPARC_BREAKPOINT */
 499
 500 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 501 {
 502         enum ctx_state prev_state = exception_enter();
 503         siginfo_t info;
 504
 505         if (test_thread_flag(TIF_32BIT)) {
 506                 regs->tpc &= 0xffffffff;
 507                 regs->tnpc &= 0xffffffff;
 508         }
 509 #ifdef DEBUG_SPARC_BREAKPOINT
 510         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
 511 #endif
 512         info.si_signo = SIGTRAP;
 513         info.si_errno = 0;
 514         info.si_code = TRAP_BRKPT;
 515         info.si_addr = (void __user *)regs->tpc;
 516         info.si_trapno = 0;
 517         force_sig_info(SIGTRAP, &info, current);
 518 #ifdef DEBUG_SPARC_BREAKPOINT
 519         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
 520 #endif
 521         exception_exit(prev_state);
 522 }
 523
 524 extern void check_pending(int signum);
 525
 526 SYSCALL_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
 544 out:
 545         up_read(&uts_sem);
 546         return err;
 547 }
 548
 549 SYSCALL_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
 609 asmlinkage 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
 618 SYSCALL_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
 645 asmlinkage long sys_kern_features(void)
 646 {
 647         return KERN_FEATURE_MIXED_MODE_STACK;
 648 }