arch/m68k/kernel/sys_m68k.c

   1 /*
   2  * linux/arch/m68k/kernel/sys_m68k.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/m68k
   6  * platform.
   7  */
   8
   9 #include <linux/capability.h>
  10 #include <linux/errno.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/fs.h>
  14 #include <linux/smp.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/sem.h>
  17 #include <linux/msg.h>
  18 #include <linux/shm.h>
  19 #include <linux/stat.h>
  20 #include <linux/syscalls.h>
  21 #include <linux/mman.h>
  22 #include <linux/file.h>
  23 #include <linux/utsname.h>
  24 #include <linux/ipc.h>
  25
  26 #include <asm/setup.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/cachectl.h>
  29 #include <asm/traps.h>
  30 #include <asm/page.h>
  31 #include <asm/unistd.h>
  32
  33 /*
  34  * sys_pipe() is the normal C calling standard for creating
  35  * a pipe. It's not the way unix traditionally does this, though.
  36  */
  37 asmlinkage int sys_pipe(unsigned long __user * fildes)
  38 {
  39         int fd[2];
  40         int error;
  41
  42         error = do_pipe(fd);
  43         if (!error) {
  44                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  45                         error = -EFAULT;
  46         }
  47         return error;
  48 }
  49
  50 /* common code for old and new mmaps */
  51 static inline long do_mmap2(
  52         unsigned long addr, unsigned long len,
  53         unsigned long prot, unsigned long flags,
  54         unsigned long fd, unsigned long pgoff)
  55 {
  56         int error = -EBADF;
  57         struct file * file = NULL;
  58
  59         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  60         if (!(flags & MAP_ANONYMOUS)) {
  61                 file = fget(fd);
  62                 if (!file)
  63                         goto out;
  64         }
  65
  66         down_write(&current->mm->mmap_sem);
  67         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  68         up_write(&current->mm->mmap_sem);
  69
  70         if (file)
  71                 fput(file);
  72 out:
  73         return error;
  74 }
  75
  76 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  77         unsigned long prot, unsigned long flags,
  78         unsigned long fd, unsigned long pgoff)
  79 {
  80         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  81 }
  82
  83 /*
  84  * Perform the select(nd, in, out, ex, tv) and mmap() system
  85  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  86  * handle more than 4 system call parameters, so these system calls
  87  * used a memory block for parameter passing..
  88  */
  89
  90 struct mmap_arg_struct {
  91         unsigned long addr;
  92         unsigned long len;
  93         unsigned long prot;
  94         unsigned long flags;
  95         unsigned long fd;
  96         unsigned long offset;
  97 };
  98
  99 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
 100 {
 101         struct mmap_arg_struct a;
 102         int error = -EFAULT;
 103
 104         if (copy_from_user(&a, arg, sizeof(a)))
 105                 goto out;
 106
 107         error = -EINVAL;
 108         if (a.offset & ~PAGE_MASK)
 109                 goto out;
 110
 111         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 112
 113         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 114 out:
 115         return error;
 116 }
 117
 118 #if 0
 119 struct mmap_arg_struct64 {
 120         __u32 addr;
 121         __u32 len;
 122         __u32 prot;
 123         __u32 flags;
 124         __u64 offset; /* 64 bits */
 125         __u32 fd;
 126 };
 127
 128 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
 129 {
 130         int error = -EFAULT;
 131         struct file * file = NULL;
 132         struct mmap_arg_struct64 a;
 133         unsigned long pgoff;
 134
 135         if (copy_from_user(&a, arg, sizeof(a)))
 136                 return -EFAULT;
 137
 138         if ((long)a.offset & ~PAGE_MASK)
 139                 return -EINVAL;
 140
 141         pgoff = a.offset >> PAGE_SHIFT;
 142         if ((a.offset >> PAGE_SHIFT) != pgoff)
 143                 return -EINVAL;
 144
 145         if (!(a.flags & MAP_ANONYMOUS)) {
 146                 error = -EBADF;
 147                 file = fget(a.fd);
 148                 if (!file)
 149                         goto out;
 150         }
 151         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 152
 153         down_write(&current->mm->mmap_sem);
 154         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 155         up_write(&current->mm->mmap_sem);
 156         if (file)
 157                 fput(file);
 158 out:
 159         return error;
 160 }
 161 #endif
 162
 163 struct sel_arg_struct {
 164         unsigned long n;
 165         fd_set __user *inp, *outp, *exp;
 166         struct timeval __user *tvp;
 167 };
 168
 169 asmlinkage int old_select(struct sel_arg_struct __user *arg)
 170 {
 171         struct sel_arg_struct a;
 172
 173         if (copy_from_user(&a, arg, sizeof(a)))
 174                 return -EFAULT;
 175         /* sys_select() does the appropriate kernel locking */
 176         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 177 }
 178
 179 /*
 180  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 181  *
 182  * This is really horribly ugly.
 183  */
 184 asmlinkage int sys_ipc (uint call, int first, int second,
 185                         int third, void __user *ptr, long fifth)
 186 {
 187         int version, ret;
 188
 189         version = call >> 16; /* hack for backward compatibility */
 190         call &= 0xffff;
 191
 192         if (call <= SEMCTL)
 193                 switch (call) {
 194                 case SEMOP:
 195                         return sys_semop (first, ptr, second);
 196                 case SEMGET:
 197                         return sys_semget (first, second, third);
 198                 case SEMCTL: {
 199                         union semun fourth;
 200                         if (!ptr)
 201                                 return -EINVAL;
 202                         if (get_user(fourth.__pad, (void __user *__user *) ptr))
 203                                 return -EFAULT;
 204                         return sys_semctl (first, second, third, fourth);
 205                         }
 206                 default:
 207                         return -ENOSYS;
 208                 }
 209         if (call <= MSGCTL)
 210                 switch (call) {
 211                 case MSGSND:
 212                         return sys_msgsnd (first, ptr, second, third);
 213                 case MSGRCV:
 214                         switch (version) {
 215                         case 0: {
 216                                 struct ipc_kludge tmp;
 217                                 if (!ptr)
 218                                         return -EINVAL;
 219                                 if (copy_from_user (&tmp, ptr, sizeof (tmp)))
 220                                         return -EFAULT;
 221                                 return sys_msgrcv (first, tmp.msgp, second,
 222                                                    tmp.msgtyp, third);
 223                                 }
 224                         default:
 225                                 return sys_msgrcv (first, ptr,
 226                                                    second, fifth, third);
 227                         }
 228                 case MSGGET:
 229                         return sys_msgget ((key_t) first, second);
 230                 case MSGCTL:
 231                         return sys_msgctl (first, second, ptr);
 232                 default:
 233                         return -ENOSYS;
 234                 }
 235         if (call <= SHMCTL)
 236                 switch (call) {
 237                 case SHMAT:
 238                         switch (version) {
 239                         default: {
 240                                 ulong raddr;
 241                                 ret = do_shmat (first, ptr, second, &raddr);
 242                                 if (ret)
 243                                         return ret;
 244                                 return put_user (raddr, (ulong __user *) third);
 245                         }
 246                         }
 247                 case SHMDT:
 248                         return sys_shmdt (ptr);
 249                 case SHMGET:
 250                         return sys_shmget (first, second, third);
 251                 case SHMCTL:
 252                         return sys_shmctl (first, second, ptr);
 253                 default:
 254                         return -ENOSYS;
 255                 }
 256
 257         return -EINVAL;
 258 }
 259
 260 /* Convert virtual (user) address VADDR to physical address PADDR */
 261 #define virt_to_phys_040(vaddr)                                         \
 262 ({                                                                      \
 263   unsigned long _mmusr, _paddr;                                         \
 264                                                                         \
 265   __asm__ __volatile__ (".chip 68040\n\t"                               \
 266                         "ptestr (%1)\n\t"                               \
 267                         "movec %%mmusr,%0\n\t"                          \
 268                         ".chip 68k"                                     \
 269                         : "=r" (_mmusr)                                 \
 270                         : "a" (vaddr));                                 \
 271   _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;             \
 272   _paddr;                                                               \
 273 })
 274
 275 static inline int
 276 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
 277 {
 278   unsigned long paddr, i;
 279
 280   switch (scope)
 281     {
 282     case FLUSH_SCOPE_ALL:
 283       switch (cache)
 284         {
 285         case FLUSH_CACHE_DATA:
 286           /* This nop is needed for some broken versions of the 68040.  */
 287           __asm__ __volatile__ ("nop\n\t"
 288                                 ".chip 68040\n\t"
 289                                 "cpusha %dc\n\t"
 290                                 ".chip 68k");
 291           break;
 292         case FLUSH_CACHE_INSN:
 293           __asm__ __volatile__ ("nop\n\t"
 294                                 ".chip 68040\n\t"
 295                                 "cpusha %ic\n\t"
 296                                 ".chip 68k");
 297           break;
 298         default:
 299         case FLUSH_CACHE_BOTH:
 300           __asm__ __volatile__ ("nop\n\t"
 301                                 ".chip 68040\n\t"
 302                                 "cpusha %bc\n\t"
 303                                 ".chip 68k");
 304           break;
 305         }
 306       break;
 307
 308     case FLUSH_SCOPE_LINE:
 309       /* Find the physical address of the first mapped page in the
 310          address range.  */
 311       if ((paddr = virt_to_phys_040(addr))) {
 312         paddr += addr & ~(PAGE_MASK | 15);
 313         len = (len + (addr & 15) + 15) >> 4;
 314       } else {
 315         unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
 316
 317         if (len <= tmp)
 318           return 0;
 319         addr += tmp;
 320         len -= tmp;
 321         tmp = PAGE_SIZE;
 322         for (;;)
 323           {
 324             if ((paddr = virt_to_phys_040(addr)))
 325               break;
 326             if (len <= tmp)
 327               return 0;
 328             addr += tmp;
 329             len -= tmp;
 330           }
 331         len = (len + 15) >> 4;
 332       }
 333       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
 334       while (len--)
 335         {
 336           switch (cache)
 337             {
 338             case FLUSH_CACHE_DATA:
 339               __asm__ __volatile__ ("nop\n\t"
 340                                     ".chip 68040\n\t"
 341                                     "cpushl %%dc,(%0)\n\t"
 342                                     ".chip 68k"
 343                                     : : "a" (paddr));
 344               break;
 345             case FLUSH_CACHE_INSN:
 346               __asm__ __volatile__ ("nop\n\t"
 347                                     ".chip 68040\n\t"
 348                                     "cpushl %%ic,(%0)\n\t"
 349                                     ".chip 68k"
 350                                     : : "a" (paddr));
 351               break;
 352             default:
 353             case FLUSH_CACHE_BOTH:
 354               __asm__ __volatile__ ("nop\n\t"
 355                                     ".chip 68040\n\t"
 356                                     "cpushl %%bc,(%0)\n\t"
 357                                     ".chip 68k"
 358                                     : : "a" (paddr));
 359               break;
 360             }
 361           if (!--i && len)
 362             {
 363               /*
 364                * No need to page align here since it is done by
 365                * virt_to_phys_040().
 366                */
 367               addr += PAGE_SIZE;
 368               i = PAGE_SIZE / 16;
 369               /* Recompute physical address when crossing a page
 370                  boundary. */
 371               for (;;)
 372                 {
 373                   if ((paddr = virt_to_phys_040(addr)))
 374                     break;
 375                   if (len <= i)
 376                     return 0;
 377                   len -= i;
 378                   addr += PAGE_SIZE;
 379                 }
 380             }
 381           else
 382             paddr += 16;
 383         }
 384       break;
 385
 386     default:
 387     case FLUSH_SCOPE_PAGE:
 388       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
 389       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
 390         {
 391           if (!(paddr = virt_to_phys_040(addr)))
 392             continue;
 393           switch (cache)
 394             {
 395             case FLUSH_CACHE_DATA:
 396               __asm__ __volatile__ ("nop\n\t"
 397                                     ".chip 68040\n\t"
 398                                     "cpushp %%dc,(%0)\n\t"
 399                                     ".chip 68k"
 400                                     : : "a" (paddr));
 401               break;
 402             case FLUSH_CACHE_INSN:
 403               __asm__ __volatile__ ("nop\n\t"
 404                                     ".chip 68040\n\t"
 405                                     "cpushp %%ic,(%0)\n\t"
 406                                     ".chip 68k"
 407                                     : : "a" (paddr));
 408               break;
 409             default:
 410             case FLUSH_CACHE_BOTH:
 411               __asm__ __volatile__ ("nop\n\t"
 412                                     ".chip 68040\n\t"
 413                                     "cpushp %%bc,(%0)\n\t"
 414                                     ".chip 68k"
 415                                     : : "a" (paddr));
 416               break;
 417             }
 418         }
 419       break;
 420     }
 421   return 0;
 422 }
 423
 424 #define virt_to_phys_060(vaddr)                         \
 425 ({                                                      \
 426   unsigned long paddr;                                  \
 427   __asm__ __volatile__ (".chip 68060\n\t"               \
 428                         "plpar (%0)\n\t"                \
 429                         ".chip 68k"                     \
 430                         : "=a" (paddr)                  \
 431                         : "0" (vaddr));                 \
 432   (paddr); /* XXX */                                    \
 433 })
 434
 435 static inline int
 436 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
 437 {
 438   unsigned long paddr, i;
 439
 440   /*
 441    * 68060 manual says:
 442    *  cpush %dc : flush DC, remains valid (with our %cacr setup)
 443    *  cpush %ic : invalidate IC
 444    *  cpush %bc : flush DC + invalidate IC
 445    */
 446   switch (scope)
 447     {
 448     case FLUSH_SCOPE_ALL:
 449       switch (cache)
 450         {
 451         case FLUSH_CACHE_DATA:
 452           __asm__ __volatile__ (".chip 68060\n\t"
 453                                 "cpusha %dc\n\t"
 454                                 ".chip 68k");
 455           break;
 456         case FLUSH_CACHE_INSN:
 457           __asm__ __volatile__ (".chip 68060\n\t"
 458                                 "cpusha %ic\n\t"
 459                                 ".chip 68k");
 460           break;
 461         default:
 462         case FLUSH_CACHE_BOTH:
 463           __asm__ __volatile__ (".chip 68060\n\t"
 464                                 "cpusha %bc\n\t"
 465                                 ".chip 68k");
 466           break;
 467         }
 468       break;
 469
 470     case FLUSH_SCOPE_LINE:
 471       /* Find the physical address of the first mapped page in the
 472          address range.  */
 473       len += addr & 15;
 474       addr &= -16;
 475       if (!(paddr = virt_to_phys_060(addr))) {
 476         unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
 477
 478         if (len <= tmp)
 479           return 0;
 480         addr += tmp;
 481         len -= tmp;
 482         tmp = PAGE_SIZE;
 483         for (;;)
 484           {
 485             if ((paddr = virt_to_phys_060(addr)))
 486               break;
 487             if (len <= tmp)
 488               return 0;
 489             addr += tmp;
 490             len -= tmp;
 491           }
 492       }
 493       len = (len + 15) >> 4;
 494       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
 495       while (len--)
 496         {
 497           switch (cache)
 498             {
 499             case FLUSH_CACHE_DATA:
 500               __asm__ __volatile__ (".chip 68060\n\t"
 501                                     "cpushl %%dc,(%0)\n\t"
 502                                     ".chip 68k"
 503                                     : : "a" (paddr));
 504               break;
 505             case FLUSH_CACHE_INSN:
 506               __asm__ __volatile__ (".chip 68060\n\t"
 507                                     "cpushl %%ic,(%0)\n\t"
 508                                     ".chip 68k"
 509                                     : : "a" (paddr));
 510               break;
 511             default:
 512             case FLUSH_CACHE_BOTH:
 513               __asm__ __volatile__ (".chip 68060\n\t"
 514                                     "cpushl %%bc,(%0)\n\t"
 515                                     ".chip 68k"
 516                                     : : "a" (paddr));
 517               break;
 518             }
 519           if (!--i && len)
 520             {
 521
 522               /*
 523                * We just want to jump to the first cache line
 524                * in the next page.
 525                */
 526               addr += PAGE_SIZE;
 527               addr &= PAGE_MASK;
 528
 529               i = PAGE_SIZE / 16;
 530               /* Recompute physical address when crossing a page
 531                  boundary. */
 532               for (;;)
 533                 {
 534                   if ((paddr = virt_to_phys_060(addr)))
 535                     break;
 536                   if (len <= i)
 537                     return 0;
 538                   len -= i;
 539                   addr += PAGE_SIZE;
 540                 }
 541             }
 542           else
 543             paddr += 16;
 544         }
 545       break;
 546
 547     default:
 548     case FLUSH_SCOPE_PAGE:
 549       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
 550       addr &= PAGE_MASK;        /* Workaround for bug in some
 551                                    revisions of the 68060 */
 552       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
 553         {
 554           if (!(paddr = virt_to_phys_060(addr)))
 555             continue;
 556           switch (cache)
 557             {
 558             case FLUSH_CACHE_DATA:
 559               __asm__ __volatile__ (".chip 68060\n\t"
 560                                     "cpushp %%dc,(%0)\n\t"
 561                                     ".chip 68k"
 562                                     : : "a" (paddr));
 563               break;
 564             case FLUSH_CACHE_INSN:
 565               __asm__ __volatile__ (".chip 68060\n\t"
 566                                     "cpushp %%ic,(%0)\n\t"
 567                                     ".chip 68k"
 568                                     : : "a" (paddr));
 569               break;
 570             default:
 571             case FLUSH_CACHE_BOTH:
 572               __asm__ __volatile__ (".chip 68060\n\t"
 573                                     "cpushp %%bc,(%0)\n\t"
 574                                     ".chip 68k"
 575                                     : : "a" (paddr));
 576               break;
 577             }
 578         }
 579       break;
 580     }
 581   return 0;
 582 }
 583
 584 /* sys_cacheflush -- flush (part of) the processor cache.  */
 585 asmlinkage int
 586 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 587 {
 588         struct vm_area_struct *vma;
 589         int ret = -EINVAL;
 590
 591         lock_kernel();
 592         if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
 593             cache & ~FLUSH_CACHE_BOTH)
 594                 goto out;
 595
 596         if (scope == FLUSH_SCOPE_ALL) {
 597                 /* Only the superuser may explicitly flush the whole cache. */
 598                 ret = -EPERM;
 599                 if (!capable(CAP_SYS_ADMIN))
 600                         goto out;
 601         } else {
 602                 /*
 603                  * Verify that the specified address region actually belongs
 604                  * to this process.
 605                  */
 606                 vma = find_vma (current->mm, addr);
 607                 ret = -EINVAL;
 608                 /* Check for overflow.  */
 609                 if (addr + len < addr)
 610                         goto out;
 611                 if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
 612                         goto out;
 613         }
 614
 615         if (CPU_IS_020_OR_030) {
 616                 if (scope == FLUSH_SCOPE_LINE && len < 256) {
 617                         unsigned long cacr;
 618                         __asm__ ("movec %%cacr, %0" : "=r" (cacr));
 619                         if (cache & FLUSH_CACHE_INSN)
 620                                 cacr |= 4;
 621                         if (cache & FLUSH_CACHE_DATA)
 622                                 cacr |= 0x400;
 623                         len >>= 2;
 624                         while (len--) {
 625                                 __asm__ __volatile__ ("movec %1, %%caar\n\t"
 626                                                       "movec %0, %%cacr"
 627                                                       : /* no outputs */
 628                                                       : "r" (cacr), "r" (addr));
 629                                 addr += 4;
 630                         }
 631                 } else {
 632                         /* Flush the whole cache, even if page granularity requested. */
 633                         unsigned long cacr;
 634                         __asm__ ("movec %%cacr, %0" : "=r" (cacr));
 635                         if (cache & FLUSH_CACHE_INSN)
 636                                 cacr |= 8;
 637                         if (cache & FLUSH_CACHE_DATA)
 638                                 cacr |= 0x800;
 639                         __asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
 640                 }
 641                 ret = 0;
 642                 goto out;
 643         } else {
 644             /*
 645              * 040 or 060: don't blindly trust 'scope', someone could
 646              * try to flush a few megs of memory.
 647              */
 648
 649             if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
 650                 scope=FLUSH_SCOPE_PAGE;
 651             if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
 652                 scope=FLUSH_SCOPE_ALL;
 653             if (CPU_IS_040) {
 654                 ret = cache_flush_040 (addr, scope, cache, len);
 655             } else if (CPU_IS_060) {
 656                 ret = cache_flush_060 (addr, scope, cache, len);
 657             }
 658         }
 659 out:
 660         unlock_kernel();
 661         return ret;
 662 }
 663
 664 asmlinkage int sys_getpagesize(void)
 665 {
 666         return PAGE_SIZE;
 667 }
 668
 669 /*
 670  * Do a system call from kernel instead of calling sys_execve so we
 671  * end up with proper pt_regs.
 672  */
 673 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 674 {
 675         register long __res asm ("%d0") = __NR_execve;
 676         register long __a asm ("%d1") = (long)(filename);
 677         register long __b asm ("%d2") = (long)(argv);
 678         register long __c asm ("%d3") = (long)(envp);
 679         asm volatile ("trap  #0" : "+d" (__res)
 680                         : "d" (__a), "d" (__b), "d" (__c));
 681         return __res;
 682 }