arch/sparc/kernel/sys_sparc.c

   1 /* linux/arch/sparc/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/mm.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/smp_lock.h>
  23 #include <linux/ipc.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/unistd.h>
  27
  28 /* #define DEBUG_UNIMP_SYSCALL */
  29
  30 /* XXX Make this per-binary type, this way we can detect the type of
  31  * XXX a binary.  Every Sparc executable calls this very early on.
  32  */
  33 asmlinkage unsigned long sys_getpagesize(void)
  34 {
  35         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  36 }
  37
  38 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  39
  40 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  41 {
  42         struct vm_area_struct * vmm;
  43
  44         if (flags & MAP_FIXED) {
  45                 /* We do not accept a shared mapping if it would violate
  46                  * cache aliasing constraints.
  47                  */
  48                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
  49                         return -EINVAL;
  50                 return addr;
  51         }
  52
  53         /* See asm-sparc/uaccess.h */
  54         if (len > TASK_SIZE - PAGE_SIZE)
  55                 return -ENOMEM;
  56         if (ARCH_SUN4C_SUN4 && len > 0x20000000)
  57                 return -ENOMEM;
  58         if (!addr)
  59                 addr = TASK_UNMAPPED_BASE;
  60
  61         if (flags & MAP_SHARED)
  62                 addr = COLOUR_ALIGN(addr);
  63         else
  64                 addr = PAGE_ALIGN(addr);
  65
  66         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  67                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  68                 if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
  69                         addr = PAGE_OFFSET;
  70                         vmm = find_vma(current->mm, PAGE_OFFSET);
  71                 }
  72                 if (TASK_SIZE - PAGE_SIZE - len < addr)
  73                         return -ENOMEM;
  74                 if (!vmm || addr + len <= vmm->vm_start)
  75                         return addr;
  76                 addr = vmm->vm_end;
  77                 if (flags & MAP_SHARED)
  78                         addr = COLOUR_ALIGN(addr);
  79         }
  80 }
  81
  82 asmlinkage unsigned long sparc_brk(unsigned long brk)
  83 {
  84         if(ARCH_SUN4C_SUN4) {
  85                 if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
  86                         return current->mm->brk;
  87         }
  88         return sys_brk(brk);
  89 }
  90
  91 /*
  92  * sys_pipe() is the normal C calling standard for creating
  93  * a pipe. It's not the way unix traditionally does this, though.
  94  */
  95 asmlinkage int sparc_pipe(struct pt_regs *regs)
  96 {
  97         int fd[2];
  98         int error;
  99
 100         error = do_pipe(fd);
 101         if (error)
 102                 goto out;
 103         regs->u_regs[UREG_I1] = fd[1];
 104         error = fd[0];
 105 out:
 106         return error;
 107 }
 108
 109 /*
 110  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 111  *
 112  * This is really horribly ugly.
 113  */
 114
 115 asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
 116 {
 117         int version, err;
 118
 119         version = call >> 16; /* hack for backward compatibility */
 120         call &= 0xffff;
 121
 122         if (call <= SEMCTL)
 123                 switch (call) {
 124                 case SEMOP:
 125                         err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
 126                         goto out;
 127                 case SEMTIMEDOP:
 128                         err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
 129                         goto out;
 130                 case SEMGET:
 131                         err = sys_semget (first, second, third);
 132                         goto out;
 133                 case SEMCTL: {
 134                         union semun fourth;
 135                         err = -EINVAL;
 136                         if (!ptr)
 137                                 goto out;
 138                         err = -EFAULT;
 139                         if (get_user(fourth.__pad,
 140                                      (void __user * __user *)ptr))
 141                                 goto out;
 142                         err = sys_semctl (first, second, third, fourth);
 143                         goto out;
 144                         }
 145                 default:
 146                         err = -ENOSYS;
 147                         goto out;
 148                 }
 149         if (call <= MSGCTL)
 150                 switch (call) {
 151                 case MSGSND:
 152                         err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
 153                                           second, third);
 154                         goto out;
 155                 case MSGRCV:
 156                         switch (version) {
 157                         case 0: {
 158                                 struct ipc_kludge tmp;
 159                                 err = -EINVAL;
 160                                 if (!ptr)
 161                                         goto out;
 162                                 err = -EFAULT;
 163                                 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
 164                                         goto out;
 165                                 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 166                                 goto out;
 167                                 }
 168                         case 1: default:
 169                                 err = sys_msgrcv (first,
 170                                                   (struct msgbuf __user *) ptr,
 171                                                   second, fifth, third);
 172                                 goto out;
 173                         }
 174                 case MSGGET:
 175                         err = sys_msgget ((key_t) first, second);
 176                         goto out;
 177                 case MSGCTL:
 178                         err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 179                         goto out;
 180                 default:
 181                         err = -ENOSYS;
 182                         goto out;
 183                 }
 184         if (call <= SHMCTL)
 185                 switch (call) {
 186                 case SHMAT:
 187                         switch (version) {
 188                         case 0: default: {
 189                                 ulong raddr;
 190                                 err = do_shmat (first, (char __user *) ptr, second, &raddr);
 191                                 if (err)
 192                                         goto out;
 193                                 err = -EFAULT;
 194                                 if (put_user (raddr, (ulong __user *) third))
 195                                         goto out;
 196                                 err = 0;
 197                                 goto out;
 198                                 }
 199                         case 1: /* iBCS2 emulator entry point */
 200                                 err = -EINVAL;
 201                                 goto out;
 202                         }
 203                 case SHMDT:
 204                         err = sys_shmdt ((char __user *)ptr);
 205                         goto out;
 206                 case SHMGET:
 207                         err = sys_shmget (first, second, third);
 208                         goto out;
 209                 case SHMCTL:
 210                         err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 211                         goto out;
 212                 default:
 213                         err = -ENOSYS;
 214                         goto out;
 215                 }
 216         else
 217                 err = -ENOSYS;
 218 out:
 219         return err;
 220 }
 221
 222 int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
 223 {
 224         if (ARCH_SUN4C_SUN4 &&
 225             (len > 0x20000000 ||
 226              (addr < 0xe0000000 && addr + len > 0x20000000)))
 227                 return -EINVAL;
 228
 229         /* See asm-sparc/uaccess.h */
 230         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 231                 return -EINVAL;
 232
 233         return 0;
 234 }
 235
 236 /* Linux version of mmap */
 237 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 238         unsigned long prot, unsigned long flags, unsigned long fd,
 239         unsigned long pgoff)
 240 {
 241         struct file * file = NULL;
 242         unsigned long retval = -EBADF;
 243
 244         if (!(flags & MAP_ANONYMOUS)) {
 245                 file = fget(fd);
 246                 if (!file)
 247                         goto out;
 248         }
 249
 250         len = PAGE_ALIGN(len);
 251         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 252
 253         down_write(&current->mm->mmap_sem);
 254         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 255         up_write(&current->mm->mmap_sem);
 256
 257         if (file)
 258                 fput(file);
 259 out:
 260         return retval;
 261 }
 262
 263 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 264         unsigned long prot, unsigned long flags, unsigned long fd,
 265         unsigned long pgoff)
 266 {
 267         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 268            we have. */
 269         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 270 }
 271
 272 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 273         unsigned long prot, unsigned long flags, unsigned long fd,
 274         unsigned long off)
 275 {
 276         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 277 }
 278
 279 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 280                            unsigned long prot, unsigned long pgoff,
 281                            unsigned long flags)
 282 {
 283         /* This works on an existing mmap so we don't need to validate
 284          * the range as that was done at the original mmap call.
 285          */
 286         return sys_remap_file_pages(start, size, prot,
 287                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 288 }
 289
 290 extern unsigned long do_mremap(unsigned long addr,
 291         unsigned long old_len, unsigned long new_len,
 292         unsigned long flags, unsigned long new_addr);
 293
 294 asmlinkage unsigned long sparc_mremap(unsigned long addr,
 295         unsigned long old_len, unsigned long new_len,
 296         unsigned long flags, unsigned long new_addr)
 297 {
 298         struct vm_area_struct *vma;
 299         unsigned long ret = -EINVAL;
 300         if (ARCH_SUN4C_SUN4) {
 301                 if (old_len > 0x20000000 || new_len > 0x20000000)
 302                         goto out;
 303                 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 304                         goto out;
 305         }
 306         if (old_len > TASK_SIZE - PAGE_SIZE ||
 307             new_len > TASK_SIZE - PAGE_SIZE)
 308                 goto out;
 309         down_write(&current->mm->mmap_sem);
 310         if (flags & MREMAP_FIXED) {
 311                 if (ARCH_SUN4C_SUN4 &&
 312                     new_addr < 0xe0000000 &&
 313                     new_addr + new_len > 0x20000000)
 314                         goto out_sem;
 315                 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 316                         goto out_sem;
 317         } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 318                     addr + new_len > 0x20000000) ||
 319                    addr + new_len > TASK_SIZE - PAGE_SIZE) {
 320                 unsigned long map_flags = 0;
 321                 struct file *file = NULL;
 322
 323                 ret = -ENOMEM;
 324                 if (!(flags & MREMAP_MAYMOVE))
 325                         goto out_sem;
 326
 327                 vma = find_vma(current->mm, addr);
 328                 if (vma) {
 329                         if (vma->vm_flags & VM_SHARED)
 330                                 map_flags |= MAP_SHARED;
 331                         file = vma->vm_file;
 332                 }
 333
 334                 new_addr = get_unmapped_area(file, addr, new_len,
 335                                      vma ? vma->vm_pgoff : 0,
 336                                      map_flags);
 337                 ret = new_addr;
 338                 if (new_addr & ~PAGE_MASK)
 339                         goto out_sem;
 340                 flags |= MREMAP_FIXED;
 341         }
 342         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 343 out_sem:
 344         up_write(&current->mm->mmap_sem);
 345 out:
 346         return ret;
 347 }
 348
 349 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 350 asmlinkage unsigned long
 351 c_sys_nis_syscall (struct pt_regs *regs)
 352 {
 353         static int count = 0;
 354
 355         if (count++ > 5)
 356                 return -ENOSYS;
 357         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 358                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 359 #ifdef DEBUG_UNIMP_SYSCALL
 360         show_regs (regs);
 361 #endif
 362         return -ENOSYS;
 363 }
 364
 365 /* #define DEBUG_SPARC_BREAKPOINT */
 366
 367 asmlinkage void
 368 sparc_breakpoint (struct pt_regs *regs)
 369 {
 370         siginfo_t info;
 371
 372         lock_kernel();
 373 #ifdef DEBUG_SPARC_BREAKPOINT
 374         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 375 #endif
 376         info.si_signo = SIGTRAP;
 377         info.si_errno = 0;
 378         info.si_code = TRAP_BRKPT;
 379         info.si_addr = (void __user *)regs->pc;
 380         info.si_trapno = 0;
 381         force_sig_info(SIGTRAP, &info, current);
 382
 383 #ifdef DEBUG_SPARC_BREAKPOINT
 384         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 385 #endif
 386         unlock_kernel();
 387 }
 388
 389 asmlinkage int
 390 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 391                  struct old_sigaction __user *oact)
 392 {
 393         struct k_sigaction new_ka, old_ka;
 394         int ret;
 395
 396         WARN_ON_ONCE(sig >= 0);
 397         sig = -sig;
 398
 399         if (act) {
 400                 unsigned long mask;
 401
 402                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 403                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 404                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 405                         return -EFAULT;
 406                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 407                 __get_user(mask, &act->sa_mask);
 408                 siginitset(&new_ka.sa.sa_mask, mask);
 409                 new_ka.ka_restorer = NULL;
 410         }
 411
 412         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 413
 414         if (!ret && oact) {
 415                 /* In the clone() case we could copy half consistent
 416                  * state to the user, however this could sleep and
 417                  * deadlock us if we held the signal lock on SMP.  So for
 418                  * now I take the easy way out and do no locking.
 419                  */
 420                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 421                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 422                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 423                         return -EFAULT;
 424                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 425                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 426         }
 427
 428         return ret;
 429 }
 430
 431 asmlinkage long
 432 sys_rt_sigaction(int sig,
 433                  const struct sigaction __user *act,
 434                  struct sigaction __user *oact,
 435                  void __user *restorer,
 436                  size_t sigsetsize)
 437 {
 438         struct k_sigaction new_ka, old_ka;
 439         int ret;
 440
 441         /* XXX: Don't preclude handling different sized sigset_t's.  */
 442         if (sigsetsize != sizeof(sigset_t))
 443                 return -EINVAL;
 444
 445         if (act) {
 446                 new_ka.ka_restorer = restorer;
 447                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 448                         return -EFAULT;
 449         }
 450
 451         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 452
 453         if (!ret && oact) {
 454                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 455                         return -EFAULT;
 456         }
 457
 458         return ret;
 459 }
 460
 461 asmlinkage int sys_getdomainname(char __user *name, int len)
 462 {
 463         int nlen, err;
 464
 465         if (len < 0)
 466                 return -EINVAL;
 467
 468         down_read(&uts_sem);
 469
 470         nlen = strlen(utsname()->domainname) + 1;
 471         err = -EINVAL;
 472         if (nlen > len)
 473                 goto out;
 474
 475         err = -EFAULT;
 476         if (!copy_to_user(name, utsname()->domainname, nlen))
 477                 err = 0;
 478
 479 out:
 480         up_read(&uts_sem);
 481         return err;
 482 }
 483
 484 /*
 485  * Do a system call from kernel instead of calling sys_execve so we
 486  * end up with proper pt_regs.
 487  */
 488 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 489 {
 490         long __res;
 491         register long __g1 __asm__ ("g1") = __NR_execve;
 492         register long __o0 __asm__ ("o0") = (long)(filename);
 493         register long __o1 __asm__ ("o1") = (long)(argv);
 494         register long __o2 __asm__ ("o2") = (long)(envp);
 495         asm volatile ("t 0x10\n\t"
 496                       "bcc 1f\n\t"
 497                       "mov %%o0, %0\n\t"
 498                       "sub %%g0, %%o0, %0\n\t"
 499                       "1:\n\t"
 500                       : "=r" (__res), "=&r" (__o0)
 501                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 502                       : "cc");
 503         return __res;
 504 }