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
  25 #include <asm/uaccess.h>
  26 #include <asm/ipc.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, (void __user **)ptr))
 140                                 goto out;
 141                         err = sys_semctl (first, second, third, fourth);
 142                         goto out;
 143                         }
 144                 default:
 145                         err = -ENOSYS;
 146                         goto out;
 147                 }
 148         if (call <= MSGCTL)
 149                 switch (call) {
 150                 case MSGSND:
 151                         err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
 152                                           second, third);
 153                         goto out;
 154                 case MSGRCV:
 155                         switch (version) {
 156                         case 0: {
 157                                 struct ipc_kludge tmp;
 158                                 err = -EINVAL;
 159                                 if (!ptr)
 160                                         goto out;
 161                                 err = -EFAULT;
 162                                 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
 163                                         goto out;
 164                                 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 165                                 goto out;
 166                                 }
 167                         case 1: default:
 168                                 err = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
 169                                 goto out;
 170                         }
 171                 case MSGGET:
 172                         err = sys_msgget ((key_t) first, second);
 173                         goto out;
 174                 case MSGCTL:
 175                         err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 176                         goto out;
 177                 default:
 178                         err = -ENOSYS;
 179                         goto out;
 180                 }
 181         if (call <= SHMCTL)
 182                 switch (call) {
 183                 case SHMAT:
 184                         switch (version) {
 185                         case 0: default: {
 186                                 ulong raddr;
 187                                 err = do_shmat (first, (char __user *) ptr, second, &raddr);
 188                                 if (err)
 189                                         goto out;
 190                                 err = -EFAULT;
 191                                 if (put_user (raddr, (ulong __user *) third))
 192                                         goto out;
 193                                 err = 0;
 194                                 goto out;
 195                                 }
 196                         case 1: /* iBCS2 emulator entry point */
 197                                 err = do_shmat (first, (char __user *) ptr, second, (ulong __user *) third);
 198                                 goto out;
 199                         }
 200                 case SHMDT:
 201                         err = sys_shmdt ((char __user *)ptr);
 202                         goto out;
 203                 case SHMGET:
 204                         err = sys_shmget (first, second, third);
 205                         goto out;
 206                 case SHMCTL:
 207                         err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 208                         goto out;
 209                 default:
 210                         err = -ENOSYS;
 211                         goto out;
 212                 }
 213         else
 214                 err = -ENOSYS;
 215 out:
 216         return err;
 217 }
 218
 219 /* Linux version of mmap */
 220 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 221         unsigned long prot, unsigned long flags, unsigned long fd,
 222         unsigned long pgoff)
 223 {
 224         struct file * file = NULL;
 225         unsigned long retval = -EBADF;
 226
 227         if (!(flags & MAP_ANONYMOUS)) {
 228                 file = fget(fd);
 229                 if (!file)
 230                         goto out;
 231         }
 232
 233         retval = -EINVAL;
 234         len = PAGE_ALIGN(len);
 235         if (ARCH_SUN4C_SUN4 &&
 236             (len > 0x20000000 ||
 237              ((flags & MAP_FIXED) &&
 238               addr < 0xe0000000 && addr + len > 0x20000000)))
 239                 goto out_putf;
 240
 241         /* See asm-sparc/uaccess.h */
 242         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 243                 goto out_putf;
 244
 245         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 246
 247         down_write(&current->mm->mmap_sem);
 248         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 249         up_write(&current->mm->mmap_sem);
 250
 251 out_putf:
 252         if (file)
 253                 fput(file);
 254 out:
 255         return retval;
 256 }
 257
 258 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 259         unsigned long prot, unsigned long flags, unsigned long fd,
 260         unsigned long pgoff)
 261 {
 262         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 263            we have. */
 264         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 265 }
 266
 267 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 268         unsigned long prot, unsigned long flags, unsigned long fd,
 269         unsigned long off)
 270 {
 271         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 272 }
 273
 274 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 275                            unsigned long prot, unsigned long pgoff,
 276                            unsigned long flags)
 277 {
 278         /* This works on an existing mmap so we don't need to validate
 279          * the range as that was done at the original mmap call.
 280          */
 281         return sys_remap_file_pages(start, size, prot,
 282                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 283 }
 284
 285 extern unsigned long do_mremap(unsigned long addr,
 286         unsigned long old_len, unsigned long new_len,
 287         unsigned long flags, unsigned long new_addr);
 288
 289 asmlinkage unsigned long sparc_mremap(unsigned long addr,
 290         unsigned long old_len, unsigned long new_len,
 291         unsigned long flags, unsigned long new_addr)
 292 {
 293         struct vm_area_struct *vma;
 294         unsigned long ret = -EINVAL;
 295         if (ARCH_SUN4C_SUN4) {
 296                 if (old_len > 0x20000000 || new_len > 0x20000000)
 297                         goto out;
 298                 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 299                         goto out;
 300         }
 301         if (old_len > TASK_SIZE - PAGE_SIZE ||
 302             new_len > TASK_SIZE - PAGE_SIZE)
 303                 goto out;
 304         down_write(&current->mm->mmap_sem);
 305         if (flags & MREMAP_FIXED) {
 306                 if (ARCH_SUN4C_SUN4 &&
 307                     new_addr < 0xe0000000 &&
 308                     new_addr + new_len > 0x20000000)
 309                         goto out_sem;
 310                 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 311                         goto out_sem;
 312         } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 313                     addr + new_len > 0x20000000) ||
 314                    addr + new_len > TASK_SIZE - PAGE_SIZE) {
 315                 unsigned long map_flags = 0;
 316                 struct file *file = NULL;
 317
 318                 ret = -ENOMEM;
 319                 if (!(flags & MREMAP_MAYMOVE))
 320                         goto out_sem;
 321
 322                 vma = find_vma(current->mm, addr);
 323                 if (vma) {
 324                         if (vma->vm_flags & VM_SHARED)
 325                                 map_flags |= MAP_SHARED;
 326                         file = vma->vm_file;
 327                 }
 328
 329                 new_addr = get_unmapped_area(file, addr, new_len,
 330                                      vma ? vma->vm_pgoff : 0,
 331                                      map_flags);
 332                 ret = new_addr;
 333                 if (new_addr & ~PAGE_MASK)
 334                         goto out_sem;
 335                 flags |= MREMAP_FIXED;
 336         }
 337         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 338 out_sem:
 339         up_write(&current->mm->mmap_sem);
 340 out:
 341         return ret;
 342 }
 343
 344 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 345 asmlinkage unsigned long
 346 c_sys_nis_syscall (struct pt_regs *regs)
 347 {
 348         static int count = 0;
 349
 350         if (count++ > 5)
 351                 return -ENOSYS;
 352         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 353                 current->comm, current->pid, (int)regs->u_regs[1]);
 354 #ifdef DEBUG_UNIMP_SYSCALL
 355         show_regs (regs);
 356 #endif
 357         return -ENOSYS;
 358 }
 359
 360 /* #define DEBUG_SPARC_BREAKPOINT */
 361
 362 asmlinkage void
 363 sparc_breakpoint (struct pt_regs *regs)
 364 {
 365         siginfo_t info;
 366
 367         lock_kernel();
 368 #ifdef DEBUG_SPARC_BREAKPOINT
 369         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 370 #endif
 371         info.si_signo = SIGTRAP;
 372         info.si_errno = 0;
 373         info.si_code = TRAP_BRKPT;
 374         info.si_addr = (void *)regs->pc;
 375         info.si_trapno = 0;
 376         force_sig_info(SIGTRAP, &info, current);
 377
 378 #ifdef DEBUG_SPARC_BREAKPOINT
 379         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 380 #endif
 381         unlock_kernel();
 382 }
 383
 384 asmlinkage int
 385 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 386                  struct old_sigaction __user *oact)
 387 {
 388         struct k_sigaction new_ka, old_ka;
 389         int ret;
 390
 391         if (sig < 0) {
 392                 current->thread.new_signal = 1;
 393                 sig = -sig;
 394         }
 395
 396         if (act) {
 397                 unsigned long mask;
 398
 399                 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
 400                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 401                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 402                         return -EFAULT;
 403                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 404                 __get_user(mask, &act->sa_mask);
 405                 siginitset(&new_ka.sa.sa_mask, mask);
 406                 new_ka.ka_restorer = NULL;
 407         }
 408
 409         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 410
 411         if (!ret && oact) {
 412                 /* In the clone() case we could copy half consistent
 413                  * state to the user, however this could sleep and
 414                  * deadlock us if we held the signal lock on SMP.  So for
 415                  * now I take the easy way out and do no locking.
 416                  */
 417                 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
 418                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 419                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 420                         return -EFAULT;
 421                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 422                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 423         }
 424
 425         return ret;
 426 }
 427
 428 asmlinkage long
 429 sys_rt_sigaction(int sig,
 430                  const struct sigaction __user *act,
 431                  struct sigaction __user *oact,
 432                  void __user *restorer,
 433                  size_t sigsetsize)
 434 {
 435         struct k_sigaction new_ka, old_ka;
 436         int ret;
 437
 438         /* XXX: Don't preclude handling different sized sigset_t's.  */
 439         if (sigsetsize != sizeof(sigset_t))
 440                 return -EINVAL;
 441
 442         /* All tasks which use RT signals (effectively) use
 443          * new style signals.
 444          */
 445         current->thread.new_signal = 1;
 446
 447         if (act) {
 448                 new_ka.ka_restorer = restorer;
 449                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 450                         return -EFAULT;
 451         }
 452
 453         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 454
 455         if (!ret && oact) {
 456                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 457                         return -EFAULT;
 458         }
 459
 460         return ret;
 461 }
 462
 463 asmlinkage int sys_getdomainname(char __user *name, int len)
 464 {
 465         int nlen;
 466         int err = -EFAULT;
 467
 468         down_read(&uts_sem);
 469
 470         nlen = strlen(system_utsname.domainname) + 1;
 471
 472         if (nlen < len)
 473                 len = nlen;
 474         if (len > __NEW_UTS_LEN)
 475                 goto done;
 476         if (copy_to_user(name, system_utsname.domainname, len))
 477                 goto done;
 478         err = 0;
 479 done:
 480         up_read(&uts_sem);
 481         return err;
 482 }