arch/sparc/kernel/sys_sparc.c

   1 /* $Id: sys_sparc.c,v 1.70 2001/04/14 01:12:02 davem Exp $
   2  * linux/arch/sparc/kernel/sys_sparc.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/sparc
   6  * platform.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/fs.h>
  14 #include <linux/file.h>
  15 #include <linux/sem.h>
  16 #include <linux/msg.h>
  17 #include <linux/shm.h>
  18 #include <linux/stat.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/mman.h>
  21 #include <linux/utsname.h>
  22 #include <linux/smp.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/vs_cvirt.h>
  25
  26 #include <asm/uaccess.h>
  27 #include <asm/ipc.h>
  28
  29 /* #define DEBUG_UNIMP_SYSCALL */
  30
  31 /* XXX Make this per-binary type, this way we can detect the type of
  32  * XXX a binary.  Every Sparc executable calls this very early on.
  33  */
  34 asmlinkage unsigned long sys_getpagesize(void)
  35 {
  36         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  37 }
  38
  39 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  40
  41 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
  42 {
  43         struct vm_area_struct * vmm;
  44
  45         if (flags & MAP_FIXED) {
  46                 /* We do not accept a shared mapping if it would violate
  47                  * cache aliasing constraints.
  48                  */
  49                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
  50                         return -EINVAL;
  51                 return addr;
  52         }
  53
  54         /* See asm-sparc/uaccess.h */
  55         if (len > TASK_SIZE - PAGE_SIZE)
  56                 return -ENOMEM;
  57         if (ARCH_SUN4C_SUN4 && len > 0x20000000)
  58                 return -ENOMEM;
  59         if (!addr)
  60                 addr = TASK_UNMAPPED_BASE;
  61
  62         if (flags & MAP_SHARED)
  63                 addr = COLOUR_ALIGN(addr);
  64         else
  65                 addr = PAGE_ALIGN(addr);
  66
  67         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  68                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  69                 if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
  70                         addr = PAGE_OFFSET;
  71                         vmm = find_vma(current->mm, PAGE_OFFSET);
  72                 }
  73                 if (TASK_SIZE - PAGE_SIZE - len < addr)
  74                         return -ENOMEM;
  75                 if (!vmm || addr + len <= vmm->vm_start)
  76                         return addr;
  77                 addr = vmm->vm_end;
  78                 if (flags & MAP_SHARED)
  79                         addr = COLOUR_ALIGN(addr);
  80         }
  81 }
  82
  83 asmlinkage unsigned long sparc_brk(unsigned long brk)
  84 {
  85         if(ARCH_SUN4C_SUN4) {
  86                 if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
  87                         return current->mm->brk;
  88         }
  89         return sys_brk(brk);
  90 }
  91
  92 /*
  93  * sys_pipe() is the normal C calling standard for creating
  94  * a pipe. It's not the way unix traditionally does this, though.
  95  */
  96 asmlinkage int sparc_pipe(struct pt_regs *regs)
  97 {
  98         int fd[2];
  99         int error;
 100
 101         error = do_pipe(fd);
 102         if (error)
 103                 goto out;
 104         regs->u_regs[UREG_I1] = fd[1];
 105         error = fd[0];
 106 out:
 107         return error;
 108 }
 109
 110 /*
 111  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 112  *
 113  * This is really horribly ugly.
 114  */
 115
 116 asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
 117 {
 118         int version, err;
 119
 120         version = call >> 16; /* hack for backward compatibility */
 121         call &= 0xffff;
 122
 123         if (call <= SEMCTL)
 124                 switch (call) {
 125                 case SEMOP:
 126                         err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
 127                         goto out;
 128                 case SEMTIMEDOP:
 129                         err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
 130                         goto out;
 131                 case SEMGET:
 132                         err = sys_semget (first, second, third);
 133                         goto out;
 134                 case SEMCTL: {
 135                         union semun fourth;
 136                         err = -EINVAL;
 137                         if (!ptr)
 138                                 goto out;
 139                         err = -EFAULT;
 140                         if (get_user(fourth.__pad,
 141                                      (void __user * __user *)ptr))
 142                                 goto out;
 143                         err = sys_semctl (first, second, third, fourth);
 144                         goto out;
 145                         }
 146                 default:
 147                         err = -ENOSYS;
 148                         goto out;
 149                 }
 150         if (call <= MSGCTL)
 151                 switch (call) {
 152                 case MSGSND:
 153                         err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
 154                                           second, third);
 155                         goto out;
 156                 case MSGRCV:
 157                         switch (version) {
 158                         case 0: {
 159                                 struct ipc_kludge tmp;
 160                                 err = -EINVAL;
 161                                 if (!ptr)
 162                                         goto out;
 163                                 err = -EFAULT;
 164                                 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
 165                                         goto out;
 166                                 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 167                                 goto out;
 168                                 }
 169                         case 1: default:
 170                                 err = sys_msgrcv (first,
 171                                                   (struct msgbuf __user *) ptr,
 172                                                   second, fifth, third);
 173                                 goto out;
 174                         }
 175                 case MSGGET:
 176                         err = sys_msgget ((key_t) first, second);
 177                         goto out;
 178                 case MSGCTL:
 179                         err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 180                         goto out;
 181                 default:
 182                         err = -ENOSYS;
 183                         goto out;
 184                 }
 185         if (call <= SHMCTL)
 186                 switch (call) {
 187                 case SHMAT:
 188                         switch (version) {
 189                         case 0: default: {
 190                                 ulong raddr;
 191                                 err = do_shmat (first, (char __user *) ptr, second, &raddr);
 192                                 if (err)
 193                                         goto out;
 194                                 err = -EFAULT;
 195                                 if (put_user (raddr, (ulong __user *) third))
 196                                         goto out;
 197                                 err = 0;
 198                                 goto out;
 199                                 }
 200                         case 1: /* iBCS2 emulator entry point */
 201                                 err = do_shmat (first, (char __user *) ptr,
 202                                                 second, (ulong *) third);
 203                                 goto out;
 204                         }
 205                 case SHMDT:
 206                         err = sys_shmdt ((char __user *)ptr);
 207                         goto out;
 208                 case SHMGET:
 209                         err = sys_shmget (first, second, third);
 210                         goto out;
 211                 case SHMCTL:
 212                         err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 213                         goto out;
 214                 default:
 215                         err = -ENOSYS;
 216                         goto out;
 217                 }
 218         else
 219                 err = -ENOSYS;
 220 out:
 221         return err;
 222 }
 223
 224 /* Linux version of mmap */
 225 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 226         unsigned long prot, unsigned long flags, unsigned long fd,
 227         unsigned long pgoff)
 228 {
 229         struct file * file = NULL;
 230         unsigned long retval = -EBADF;
 231
 232         if (!(flags & MAP_ANONYMOUS)) {
 233                 file = fget(fd);
 234                 if (!file)
 235                         goto out;
 236         }
 237
 238         retval = -EINVAL;
 239         len = PAGE_ALIGN(len);
 240         if (ARCH_SUN4C_SUN4 &&
 241             (len > 0x20000000 ||
 242              ((flags & MAP_FIXED) &&
 243               addr < 0xe0000000 && addr + len > 0x20000000)))
 244                 goto out_putf;
 245
 246         /* See asm-sparc/uaccess.h */
 247         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 248                 goto out_putf;
 249
 250         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 251
 252         down_write(&current->mm->mmap_sem);
 253         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 254         up_write(&current->mm->mmap_sem);
 255
 256 out_putf:
 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, current->pid, (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 *)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         if (sig < 0) {
 397                 current->thread.new_signal = 1;
 398                 sig = -sig;
 399         }
 400
 401         if (act) {
 402                 unsigned long mask;
 403
 404                 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
 405                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 406                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 407                         return -EFAULT;
 408                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 409                 __get_user(mask, &act->sa_mask);
 410                 siginitset(&new_ka.sa.sa_mask, mask);
 411                 new_ka.ka_restorer = NULL;
 412         }
 413
 414         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 415
 416         if (!ret && oact) {
 417                 /* In the clone() case we could copy half consistent
 418                  * state to the user, however this could sleep and
 419                  * deadlock us if we held the signal lock on SMP.  So for
 420                  * now I take the easy way out and do no locking.
 421                  */
 422                 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
 423                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 424                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 425                         return -EFAULT;
 426                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 427                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 428         }
 429
 430         return ret;
 431 }
 432
 433 asmlinkage long
 434 sys_rt_sigaction(int sig,
 435                  const struct sigaction __user *act,
 436                  struct sigaction __user *oact,
 437                  void __user *restorer,
 438                  size_t sigsetsize)
 439 {
 440         struct k_sigaction new_ka, old_ka;
 441         int ret;
 442
 443         /* XXX: Don't preclude handling different sized sigset_t's.  */
 444         if (sigsetsize != sizeof(sigset_t))
 445                 return -EINVAL;
 446
 447         /* All tasks which use RT signals (effectively) use
 448          * new style signals.
 449          */
 450         current->thread.new_signal = 1;
 451
 452         if (act) {
 453                 new_ka.ka_restorer = restorer;
 454                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 455                         return -EFAULT;
 456         }
 457
 458         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 459
 460         if (!ret && oact) {
 461                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 462                         return -EFAULT;
 463         }
 464
 465         return ret;
 466 }
 467
 468 asmlinkage int sys_getdomainname(char __user *name, int len)
 469 {
 470         int nlen;
 471         int err = -EFAULT;
 472
 473         down_read(&uts_sem);
 474
 475         nlen = strlen(vx_new_uts(domainname)) + 1;
 476
 477         if (nlen < len)
 478                 len = nlen;
 479         if (len > __NEW_UTS_LEN)
 480                 goto done;
 481         if (copy_to_user(name, vx_new_uts(domainname), len))
 482                 goto done;
 483         err = 0;
 484 done:
 485         up_read(&uts_sem);
 486         return err;
 487 }