arch/sparc/kernel/sys_sparc.c

   1 /* $Id: sys_sparc.c,v 1.67 2000/11/30 08:37:31 anton 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/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/smp_lock.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/ipc.h>
  26
  27 /* #define DEBUG_UNIMP_SYSCALL */
  28
  29 /* XXX Make this per-binary type, this way we can detect the type of
  30  * XXX a binary.  Every Sparc executable calls this very early on.
  31  */
  32 asmlinkage unsigned long sys_getpagesize(void)
  33 {
  34         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
  35 }
  36
  37 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  38
  39 unsigned long get_unmapped_area(unsigned long addr, unsigned long len)
  40 {
  41         struct vm_area_struct * vmm;
  42
  43         /* See asm-sparc/uaccess.h */
  44         if (len > TASK_SIZE - PAGE_SIZE)
  45                 return 0;
  46         if (ARCH_SUN4C_SUN4 && len > 0x20000000)
  47                 return 0;
  48         if (!addr)
  49                 addr = TASK_UNMAPPED_BASE;
  50
  51         if (current->thread.flags & SPARC_FLAG_MMAPSHARED)
  52                 addr = COLOUR_ALIGN(addr);
  53         else
  54                 addr = PAGE_ALIGN(addr);
  55
  56         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  57                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  58                 if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
  59                         addr = PAGE_OFFSET;
  60                         vmm = find_vma(current->mm, PAGE_OFFSET);
  61                 }
  62                 if (TASK_SIZE - PAGE_SIZE - len < addr)
  63                         return 0;
  64                 if (!vmm || addr + len <= vmm->vm_start)
  65                         return addr;
  66                 addr = vmm->vm_end;
  67                 if (current->thread.flags & SPARC_FLAG_MMAPSHARED)
  68                         addr = COLOUR_ALIGN(addr);
  69         }
  70 }
  71
  72 extern asmlinkage unsigned long sys_brk(unsigned long brk);
  73
  74 asmlinkage unsigned long sparc_brk(unsigned long brk)
  75 {
  76         if(ARCH_SUN4C_SUN4) {
  77                 if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
  78                         return current->mm->brk;
  79         }
  80         return sys_brk(brk);
  81 }
  82
  83 /*
  84  * sys_pipe() is the normal C calling standard for creating
  85  * a pipe. It's not the way unix traditionally does this, though.
  86  */
  87 asmlinkage int sparc_pipe(struct pt_regs *regs)
  88 {
  89         int fd[2];
  90         int error;
  91
  92         error = do_pipe(fd);
  93         if (error)
  94                 goto out;
  95         regs->u_regs[UREG_I1] = fd[1];
  96         error = fd[0];
  97 out:
  98         return error;
  99 }
 100
 101 /*
 102  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 103  *
 104  * This is really horribly ugly.
 105  */
 106
 107 asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 108 {
 109         int version, err;
 110
 111         version = call >> 16; /* hack for backward compatibility */
 112         call &= 0xffff;
 113
 114         if (call <= SEMCTL)
 115                 switch (call) {
 116                 case SEMOP:
 117                         err = sys_semop (first, (struct sembuf *)ptr, second);
 118                         goto out;
 119                 case SEMGET:
 120                         err = sys_semget (first, second, third);
 121                         goto out;
 122                 case SEMCTL: {
 123                         union semun fourth;
 124                         err = -EINVAL;
 125                         if (!ptr)
 126                                 goto out;
 127                         err = -EFAULT;
 128                         if(get_user(fourth.__pad, (void **)ptr))
 129                                 goto out;
 130                         err = sys_semctl (first, second, third, fourth);
 131                         goto out;
 132                         }
 133                 default:
 134                         err = -EINVAL;
 135                         goto out;
 136                 }
 137         if (call <= MSGCTL)
 138                 switch (call) {
 139                 case MSGSND:
 140                         err = sys_msgsnd (first, (struct msgbuf *) ptr,
 141                                           second, third);
 142                         goto out;
 143                 case MSGRCV:
 144                         switch (version) {
 145                         case 0: {
 146                                 struct ipc_kludge tmp;
 147                                 err = -EINVAL;
 148                                 if (!ptr)
 149                                         goto out;
 150                                 err = -EFAULT;
 151                                 if(copy_from_user(&tmp,(struct ipc_kludge *) ptr, sizeof (tmp)))
 152                                         goto out;
 153                                 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 154                                 goto out;
 155                                 }
 156                         case 1: default:
 157                                 err = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
 158                                 goto out;
 159                         }
 160                 case MSGGET:
 161                         err = sys_msgget ((key_t) first, second);
 162                         goto out;
 163                 case MSGCTL:
 164                         err = sys_msgctl (first, second, (struct msqid_ds *) ptr);
 165                         goto out;
 166                 default:
 167                         err = -EINVAL;
 168                         goto out;
 169                 }
 170         if (call <= SHMCTL)
 171                 switch (call) {
 172                 case SHMAT:
 173                         switch (version) {
 174                         case 0: default: {
 175                                 ulong raddr;
 176                                 err = sys_shmat (first, (char *) ptr, second, &raddr);
 177                                 if (err)
 178                                         goto out;
 179                                 err = -EFAULT;
 180                                 if(put_user (raddr, (ulong *) third))
 181                                         goto out;
 182                                 err = 0;
 183                                 goto out;
 184                                 }
 185                         case 1: /* iBCS2 emulator entry point */
 186                                 err = sys_shmat (first, (char *) ptr, second, (ulong *) third);
 187                                 goto out;
 188                         }
 189                 case SHMDT:
 190                         err = sys_shmdt ((char *)ptr);
 191                         goto out;
 192                 case SHMGET:
 193                         err = sys_shmget (first, second, third);
 194                         goto out;
 195                 case SHMCTL:
 196                         err = sys_shmctl (first, second, (struct shmid_ds *) ptr);
 197                         goto out;
 198                 default:
 199                         err = -EINVAL;
 200                         goto out;
 201                 }
 202         else
 203                 err = -EINVAL;
 204 out:
 205         return err;
 206 }
 207
 208 /* Linux version of mmap */
 209 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 210         unsigned long prot, unsigned long flags, unsigned long fd,
 211         unsigned long pgoff)
 212 {
 213         struct file * file = NULL;
 214         unsigned long retval = -EBADF;
 215
 216         if (!(flags & MAP_ANONYMOUS)) {
 217                 file = fget(fd);
 218                 if (!file)
 219                         goto out;
 220         }
 221
 222         retval = -EINVAL;
 223         len = PAGE_ALIGN(len);
 224         if (ARCH_SUN4C_SUN4 &&
 225             (len > 0x20000000 ||
 226              ((flags & MAP_FIXED) &&
 227               addr < 0xe0000000 && addr + len > 0x20000000)))
 228                 goto out_putf;
 229
 230         /* See asm-sparc/uaccess.h */
 231         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 232                 goto out_putf;
 233
 234         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 235
 236         if (flags & MAP_SHARED)
 237                 current->thread.flags |= SPARC_FLAG_MMAPSHARED;
 238
 239         down(&current->mm->mmap_sem);
 240         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 241         up(&current->mm->mmap_sem);
 242
 243         current->thread.flags &= ~(SPARC_FLAG_MMAPSHARED);
 244
 245 out_putf:
 246         if (file)
 247                 fput(file);
 248 out:
 249         return retval;
 250 }
 251
 252 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 253         unsigned long prot, unsigned long flags, unsigned long fd,
 254         unsigned long pgoff)
 255 {
 256         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 257            we have. */
 258         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 259 }
 260
 261 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 262         unsigned long prot, unsigned long flags, unsigned long fd,
 263         unsigned long off)
 264 {
 265         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 266 }
 267
 268 extern unsigned long do_mremap(unsigned long addr,
 269         unsigned long old_len, unsigned long new_len,
 270         unsigned long flags, unsigned long new_addr);
 271
 272 asmlinkage unsigned long sparc_mremap(unsigned long addr,
 273         unsigned long old_len, unsigned long new_len,
 274         unsigned long flags, unsigned long new_addr)
 275 {
 276         struct vm_area_struct *vma;
 277         unsigned long ret = -EINVAL;
 278         if (ARCH_SUN4C_SUN4) {
 279                 if (old_len > 0x20000000 || new_len > 0x20000000)
 280                         goto out;
 281                 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 282                         goto out;
 283         }
 284         if (old_len > TASK_SIZE - PAGE_SIZE ||
 285             new_len > TASK_SIZE - PAGE_SIZE)
 286                 goto out;
 287         down(&current->mm->mmap_sem);
 288         vma = find_vma(current->mm, addr);
 289         if (vma && (vma->vm_flags & VM_SHARED))
 290                 current->thread.flags |= SPARC_FLAG_MMAPSHARED;
 291         if (flags & MREMAP_FIXED) {
 292                 if (ARCH_SUN4C_SUN4 &&
 293                     new_addr < 0xe0000000 &&
 294                     new_addr + new_len > 0x20000000)
 295                         goto out_sem;
 296                 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 297                         goto out_sem;
 298         } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 299                     addr + new_len > 0x20000000) ||
 300                    addr + new_len > TASK_SIZE - PAGE_SIZE) {
 301                 ret = -ENOMEM;
 302                 if (!(flags & MREMAP_MAYMOVE))
 303                         goto out_sem;
 304                 new_addr = get_unmapped_area (addr, new_len);
 305                 if (!new_addr)
 306                         goto out_sem;
 307                 flags |= MREMAP_FIXED;
 308         }
 309         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 310 out_sem:
 311         current->thread.flags &= ~(SPARC_FLAG_MMAPSHARED);
 312         up(&current->mm->mmap_sem);
 313 out:
 314         return ret;
 315 }
 316
 317 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 318 asmlinkage unsigned long
 319 c_sys_nis_syscall (struct pt_regs *regs)
 320 {
 321         static int count = 0;
 322
 323         if (count++ > 5) return -ENOSYS;
 324         printk ("%s[%d]: Unimplemented SPARC system call %d\n", current->comm, current->pid, (int)regs->u_regs[1]);
 325 #ifdef DEBUG_UNIMP_SYSCALL
 326         show_regs (regs);
 327 #endif
 328         return -ENOSYS;
 329 }
 330
 331 /* #define DEBUG_SPARC_BREAKPOINT */
 332
 333 asmlinkage void
 334 sparc_breakpoint (struct pt_regs *regs)
 335 {
 336         siginfo_t info;
 337
 338         lock_kernel();
 339 #ifdef DEBUG_SPARC_BREAKPOINT
 340         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 341 #endif
 342         info.si_signo = SIGTRAP;
 343         info.si_errno = 0;
 344         info.si_code = TRAP_BRKPT;
 345         info.si_addr = (void *)regs->pc;
 346         info.si_trapno = 0;
 347         force_sig_info(SIGTRAP, &info, current);
 348
 349 #ifdef DEBUG_SPARC_BREAKPOINT
 350         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 351 #endif
 352         unlock_kernel();
 353 }
 354
 355 asmlinkage int
 356 sparc_sigaction (int sig, const struct old_sigaction *act,
 357                  struct old_sigaction *oact)
 358 {
 359         struct k_sigaction new_ka, old_ka;
 360         int ret;
 361
 362         if (sig < 0) {
 363                 current->thread.new_signal = 1;
 364                 sig = -sig;
 365         }
 366
 367         if (act) {
 368                 unsigned long mask;
 369
 370                 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
 371                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 372                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 373                         return -EFAULT;
 374                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 375                 __get_user(mask, &act->sa_mask);
 376                 siginitset(&new_ka.sa.sa_mask, mask);
 377                 new_ka.ka_restorer = NULL;
 378         }
 379
 380         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 381
 382         if (!ret && oact) {
 383                 /* In the clone() case we could copy half consistant
 384                  * state to the user, however this could sleep and
 385                  * deadlock us if we held the signal lock on SMP.  So for
 386                  * now I take the easy way out and do no locking.
 387                  */
 388                 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
 389                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 390                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 391                         return -EFAULT;
 392                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 393                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 394         }
 395
 396         return ret;
 397 }
 398
 399 asmlinkage int
 400 sys_rt_sigaction(int sig, const struct sigaction *act, struct sigaction *oact,
 401                  void *restorer, size_t sigsetsize)
 402 {
 403         struct k_sigaction new_ka, old_ka;
 404         int ret;
 405
 406         /* XXX: Don't preclude handling different sized sigset_t's.  */
 407         if (sigsetsize != sizeof(sigset_t))
 408                 return -EINVAL;
 409
 410         /* All tasks which use RT signals (effectively) use
 411          * new style signals.
 412          */
 413         current->thread.new_signal = 1;
 414
 415         if (act) {
 416                 new_ka.ka_restorer = restorer;
 417                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 418                         return -EFAULT;
 419         }
 420
 421         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 422
 423         if (!ret && oact) {
 424                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 425                         return -EFAULT;
 426         }
 427
 428         return ret;
 429 }
 430
 431 /* Just in case some old old binary calls this. */
 432 asmlinkage int sys_pause(void)
 433 {
 434         current->state = TASK_INTERRUPTIBLE;
 435         schedule();
 436         return -ERESTARTNOHAND;
 437 }
 438
 439 asmlinkage int sys_getdomainname(char *name, int len)
 440 {
 441         int nlen;
 442         int err = -EFAULT;
 443
 444         down_read(&uts_sem);
 445
 446         nlen = strlen(system_utsname.domainname) + 1;
 447
 448         if (nlen < len)
 449                 len = nlen;
 450         if(len > __NEW_UTS_LEN)
 451                 goto done;
 452         if(copy_to_user(name, system_utsname.domainname, len))
 453                 goto done;
 454         err = 0;
 455 done:
 456         up_read(&uts_sem);
 457         return err;
 458 }