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 = -EINVAL;
 202                                 goto out;
 203                         }
 204                 case SHMDT:
 205                         err = sys_shmdt ((char __user *)ptr);
 206                         goto out;
 207                 case SHMGET:
 208                         err = sys_shmget (first, second, third);
 209                         goto out;
 210                 case SHMCTL:
 211                         err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 212                         goto out;
 213                 default:
 214                         err = -ENOSYS;
 215                         goto out;
 216                 }
 217         else
 218                 err = -ENOSYS;
 219 out:
 220         return err;
 221 }
 222
 223 /* Linux version of mmap */
 224 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 225         unsigned long prot, unsigned long flags, unsigned long fd,
 226         unsigned long pgoff)
 227 {
 228         struct file * file = NULL;
 229         unsigned long retval = -EBADF;
 230
 231         if (!(flags & MAP_ANONYMOUS)) {
 232                 file = fget(fd);
 233                 if (!file)
 234                         goto out;
 235         }
 236
 237         retval = -EINVAL;
 238         len = PAGE_ALIGN(len);
 239         if (ARCH_SUN4C_SUN4 &&
 240             (len > 0x20000000 ||
 241              ((flags & MAP_FIXED) &&
 242               addr < 0xe0000000 && addr + len > 0x20000000)))
 243                 goto out_putf;
 244
 245         /* See asm-sparc/uaccess.h */
 246         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 247                 goto out_putf;
 248
 249         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 250
 251         down_write(&current->mm->mmap_sem);
 252         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 253         up_write(&current->mm->mmap_sem);
 254
 255 out_putf:
 256         if (file)
 257                 fput(file);
 258 out:
 259         return retval;
 260 }
 261
 262 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 263         unsigned long prot, unsigned long flags, unsigned long fd,
 264         unsigned long pgoff)
 265 {
 266         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 267            we have. */
 268         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 269 }
 270
 271 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 272         unsigned long prot, unsigned long flags, unsigned long fd,
 273         unsigned long off)
 274 {
 275         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 276 }
 277
 278 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 279                            unsigned long prot, unsigned long pgoff,
 280                            unsigned long flags)
 281 {
 282         /* This works on an existing mmap so we don't need to validate
 283          * the range as that was done at the original mmap call.
 284          */
 285         return sys_remap_file_pages(start, size, prot,
 286                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 287 }
 288
 289 extern unsigned long do_mremap(unsigned long addr,
 290         unsigned long old_len, unsigned long new_len,
 291         unsigned long flags, unsigned long new_addr);
 292
 293 asmlinkage unsigned long sparc_mremap(unsigned long addr,
 294         unsigned long old_len, unsigned long new_len,
 295         unsigned long flags, unsigned long new_addr)
 296 {
 297         struct vm_area_struct *vma;
 298         unsigned long ret = -EINVAL;
 299         if (ARCH_SUN4C_SUN4) {
 300                 if (old_len > 0x20000000 || new_len > 0x20000000)
 301                         goto out;
 302                 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 303                         goto out;
 304         }
 305         if (old_len > TASK_SIZE - PAGE_SIZE ||
 306             new_len > TASK_SIZE - PAGE_SIZE)
 307                 goto out;
 308         down_write(&current->mm->mmap_sem);
 309         if (flags & MREMAP_FIXED) {
 310                 if (ARCH_SUN4C_SUN4 &&
 311                     new_addr < 0xe0000000 &&
 312                     new_addr + new_len > 0x20000000)
 313                         goto out_sem;
 314                 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 315                         goto out_sem;
 316         } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 317                     addr + new_len > 0x20000000) ||
 318                    addr + new_len > TASK_SIZE - PAGE_SIZE) {
 319                 unsigned long map_flags = 0;
 320                 struct file *file = NULL;
 321
 322                 ret = -ENOMEM;
 323                 if (!(flags & MREMAP_MAYMOVE))
 324                         goto out_sem;
 325
 326                 vma = find_vma(current->mm, addr);
 327                 if (vma) {
 328                         if (vma->vm_flags & VM_SHARED)
 329                                 map_flags |= MAP_SHARED;
 330                         file = vma->vm_file;
 331                 }
 332
 333                 new_addr = get_unmapped_area(file, addr, new_len,
 334                                      vma ? vma->vm_pgoff : 0,
 335                                      map_flags);
 336                 ret = new_addr;
 337                 if (new_addr & ~PAGE_MASK)
 338                         goto out_sem;
 339                 flags |= MREMAP_FIXED;
 340         }
 341         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 342 out_sem:
 343         up_write(&current->mm->mmap_sem);
 344 out:
 345         return ret;
 346 }
 347
 348 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 349 asmlinkage unsigned long
 350 c_sys_nis_syscall (struct pt_regs *regs)
 351 {
 352         static int count = 0;
 353
 354         if (count++ > 5)
 355                 return -ENOSYS;
 356         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 357                 current->comm, current->pid, (int)regs->u_regs[1]);
 358 #ifdef DEBUG_UNIMP_SYSCALL
 359         show_regs (regs);
 360 #endif
 361         return -ENOSYS;
 362 }
 363
 364 /* #define DEBUG_SPARC_BREAKPOINT */
 365
 366 asmlinkage void
 367 sparc_breakpoint (struct pt_regs *regs)
 368 {
 369         siginfo_t info;
 370
 371         lock_kernel();
 372 #ifdef DEBUG_SPARC_BREAKPOINT
 373         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 374 #endif
 375         info.si_signo = SIGTRAP;
 376         info.si_errno = 0;
 377         info.si_code = TRAP_BRKPT;
 378         info.si_addr = (void __user *)regs->pc;
 379         info.si_trapno = 0;
 380         force_sig_info(SIGTRAP, &info, current);
 381
 382 #ifdef DEBUG_SPARC_BREAKPOINT
 383         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 384 #endif
 385         unlock_kernel();
 386 }
 387
 388 asmlinkage int
 389 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 390                  struct old_sigaction __user *oact)
 391 {
 392         struct k_sigaction new_ka, old_ka;
 393         int ret;
 394
 395         if (sig < 0) {
 396                 current->thread.new_signal = 1;
 397                 sig = -sig;
 398         }
 399
 400         if (act) {
 401                 unsigned long mask;
 402
 403                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 404                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 405                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 406                         return -EFAULT;
 407                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 408                 __get_user(mask, &act->sa_mask);
 409                 siginitset(&new_ka.sa.sa_mask, mask);
 410                 new_ka.ka_restorer = NULL;
 411         }
 412
 413         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 414
 415         if (!ret && oact) {
 416                 /* In the clone() case we could copy half consistent
 417                  * state to the user, however this could sleep and
 418                  * deadlock us if we held the signal lock on SMP.  So for
 419                  * now I take the easy way out and do no locking.
 420                  */
 421                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 422                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 423                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 424                         return -EFAULT;
 425                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 426                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 427         }
 428
 429         return ret;
 430 }
 431
 432 asmlinkage long
 433 sys_rt_sigaction(int sig,
 434                  const struct sigaction __user *act,
 435                  struct sigaction __user *oact,
 436                  void __user *restorer,
 437                  size_t sigsetsize)
 438 {
 439         struct k_sigaction new_ka, old_ka;
 440         int ret;
 441
 442         /* XXX: Don't preclude handling different sized sigset_t's.  */
 443         if (sigsetsize != sizeof(sigset_t))
 444                 return -EINVAL;
 445
 446         /* All tasks which use RT signals (effectively) use
 447          * new style signals.
 448          */
 449         current->thread.new_signal = 1;
 450
 451         if (act) {
 452                 new_ka.ka_restorer = restorer;
 453                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 454                         return -EFAULT;
 455         }
 456
 457         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 458
 459         if (!ret && oact) {
 460                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 461                         return -EFAULT;
 462         }
 463
 464         return ret;
 465 }
 466
 467 asmlinkage int sys_getdomainname(char __user *name, int len)
 468 {
 469         int nlen;
 470         int err = -EFAULT;
 471
 472         down_read(&uts_sem);
 473
 474         nlen = strlen(vx_new_uts(domainname)) + 1;
 475
 476         if (nlen < len)
 477                 len = nlen;
 478         if (len > __NEW_UTS_LEN)
 479                 goto done;
 480         if (copy_to_user(name, vx_new_uts(domainname), len))
 481                 goto done;
 482         err = 0;
 483 done:
 484         up_read(&uts_sem);
 485         return err;
 486 }