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   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,
 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 /* Linux version of mmap */
 223 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 224         unsigned long prot, unsigned long flags, unsigned long fd,
 225         unsigned long pgoff)
 226 {
 227         struct file * file = NULL;
 228         unsigned long retval = -EBADF;
 229
 230         if (!(flags & MAP_ANONYMOUS)) {
 231                 file = fget(fd);
 232                 if (!file)
 233                         goto out;
 234         }
 235
 236         retval = -EINVAL;
 237         len = PAGE_ALIGN(len);
 238         if (ARCH_SUN4C_SUN4 &&
 239             (len > 0x20000000 ||
 240              ((flags & MAP_FIXED) &&
 241               addr < 0xe0000000 && addr + len > 0x20000000)))
 242                 goto out_putf;
 243
 244         /* See asm-sparc/uaccess.h */
 245         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 246                 goto out_putf;
 247
 248         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 249
 250         down_write(&current->mm->mmap_sem);
 251         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 252         up_write(&current->mm->mmap_sem);
 253
 254 out_putf:
 255         if (file)
 256                 fput(file);
 257 out:
 258         return retval;
 259 }
 260
 261 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 262         unsigned long prot, unsigned long flags, unsigned long fd,
 263         unsigned long pgoff)
 264 {
 265         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 266            we have. */
 267         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 268 }
 269
 270 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 271         unsigned long prot, unsigned long flags, unsigned long fd,
 272         unsigned long off)
 273 {
 274         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 275 }
 276
 277 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 278                            unsigned long prot, unsigned long pgoff,
 279                            unsigned long flags)
 280 {
 281         /* This works on an existing mmap so we don't need to validate
 282          * the range as that was done at the original mmap call.
 283          */
 284         return sys_remap_file_pages(start, size, prot,
 285                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 286 }
 287
 288 extern unsigned long do_mremap(unsigned long addr,
 289         unsigned long old_len, unsigned long new_len,
 290         unsigned long flags, unsigned long new_addr);
 291
 292 asmlinkage unsigned long sparc_mremap(unsigned long addr,
 293         unsigned long old_len, unsigned long new_len,
 294         unsigned long flags, unsigned long new_addr)
 295 {
 296         struct vm_area_struct *vma;
 297         unsigned long ret = -EINVAL;
 298         if (ARCH_SUN4C_SUN4) {
 299                 if (old_len > 0x20000000 || new_len > 0x20000000)
 300                         goto out;
 301                 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 302                         goto out;
 303         }
 304         if (old_len > TASK_SIZE - PAGE_SIZE ||
 305             new_len > TASK_SIZE - PAGE_SIZE)
 306                 goto out;
 307         down_write(&current->mm->mmap_sem);
 308         if (flags & MREMAP_FIXED) {
 309                 if (ARCH_SUN4C_SUN4 &&
 310                     new_addr < 0xe0000000 &&
 311                     new_addr + new_len > 0x20000000)
 312                         goto out_sem;
 313                 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 314                         goto out_sem;
 315         } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 316                     addr + new_len > 0x20000000) ||
 317                    addr + new_len > TASK_SIZE - PAGE_SIZE) {
 318                 unsigned long map_flags = 0;
 319                 struct file *file = NULL;
 320
 321                 ret = -ENOMEM;
 322                 if (!(flags & MREMAP_MAYMOVE))
 323                         goto out_sem;
 324
 325                 vma = find_vma(current->mm, addr);
 326                 if (vma) {
 327                         if (vma->vm_flags & VM_SHARED)
 328                                 map_flags |= MAP_SHARED;
 329                         file = vma->vm_file;
 330                 }
 331
 332                 new_addr = get_unmapped_area(file, addr, new_len,
 333                                      vma ? vma->vm_pgoff : 0,
 334                                      map_flags);
 335                 ret = new_addr;
 336                 if (new_addr & ~PAGE_MASK)
 337                         goto out_sem;
 338                 flags |= MREMAP_FIXED;
 339         }
 340         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 341 out_sem:
 342         up_write(&current->mm->mmap_sem);
 343 out:
 344         return ret;
 345 }
 346
 347 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 348 asmlinkage unsigned long
 349 c_sys_nis_syscall (struct pt_regs *regs)
 350 {
 351         static int count = 0;
 352
 353         if (count++ > 5)
 354                 return -ENOSYS;
 355         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 356                 current->comm, current->pid, (int)regs->u_regs[1]);
 357 #ifdef DEBUG_UNIMP_SYSCALL
 358         show_regs (regs);
 359 #endif
 360         return -ENOSYS;
 361 }
 362
 363 /* #define DEBUG_SPARC_BREAKPOINT */
 364
 365 asmlinkage void
 366 sparc_breakpoint (struct pt_regs *regs)
 367 {
 368         siginfo_t info;
 369
 370         lock_kernel();
 371 #ifdef DEBUG_SPARC_BREAKPOINT
 372         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 373 #endif
 374         info.si_signo = SIGTRAP;
 375         info.si_errno = 0;
 376         info.si_code = TRAP_BRKPT;
 377         info.si_addr = (void __user *)regs->pc;
 378         info.si_trapno = 0;
 379         force_sig_info(SIGTRAP, &info, current);
 380
 381 #ifdef DEBUG_SPARC_BREAKPOINT
 382         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 383 #endif
 384         unlock_kernel();
 385 }
 386
 387 asmlinkage int
 388 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 389                  struct old_sigaction __user *oact)
 390 {
 391         struct k_sigaction new_ka, old_ka;
 392         int ret;
 393
 394         if (sig < 0) {
 395                 current->thread.new_signal = 1;
 396                 sig = -sig;
 397         }
 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         /* All tasks which use RT signals (effectively) use
 446          * new style signals.
 447          */
 448         current->thread.new_signal = 1;
 449
 450         if (act) {
 451                 new_ka.ka_restorer = restorer;
 452                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 453                         return -EFAULT;
 454         }
 455
 456         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 457
 458         if (!ret && oact) {
 459                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 460                         return -EFAULT;
 461         }
 462
 463         return ret;
 464 }
 465
 466 asmlinkage int sys_getdomainname(char __user *name, int len)
 467 {
 468         int nlen;
 469         int err = -EFAULT;
 470
 471         down_read(&uts_sem);
 472
 473         nlen = strlen(system_utsname.domainname) + 1;
 474
 475         if (nlen < len)
 476                 len = nlen;
 477         if (len > __NEW_UTS_LEN)
 478                 goto done;
 479         if (copy_to_user(name, system_utsname.domainname, len))
 480                 goto done;
 481         err = 0;
 482 done:
 483         up_read(&uts_sem);
 484         return err;
 485 }