arch/sparc/kernel/sys_sparc.c

   1 /* linux/arch/sparc/kernel/sys_sparc.c
   2  *
   3  * This file contains various random system calls that
   4  * have a non-standard calling sequence on the Linux/sparc
   5  * platform.
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/sched.h>
  11 #include <linux/mm.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/mman.h>
  20 #include <linux/utsname.h>
  21 #include <linux/smp.h>
  22 #include <linux/smp_lock.h>
  23 #include <linux/ipc.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/unistd.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_flags(fd, 0);
 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 int sparc_mmap_check(unsigned long addr, unsigned long len)
 223 {
 224         if (ARCH_SUN4C_SUN4 &&
 225             (len > 0x20000000 ||
 226              (addr < 0xe0000000 && addr + len > 0x20000000)))
 227                 return -EINVAL;
 228
 229         /* See asm-sparc/uaccess.h */
 230         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 231                 return -EINVAL;
 232
 233         return 0;
 234 }
 235
 236 /* Linux version of mmap */
 237 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 238         unsigned long prot, unsigned long flags, unsigned long fd,
 239         unsigned long pgoff)
 240 {
 241         struct file * file = NULL;
 242         unsigned long retval = -EBADF;
 243
 244         if (!(flags & MAP_ANONYMOUS)) {
 245                 file = fget(fd);
 246                 if (!file)
 247                         goto out;
 248         }
 249
 250         len = PAGE_ALIGN(len);
 251         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 252
 253         down_write(&current->mm->mmap_sem);
 254         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 255         up_write(&current->mm->mmap_sem);
 256
 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         unsigned long ret = -EINVAL;
 299
 300         if (unlikely(sparc_mmap_check(addr, old_len)))
 301                 goto out;
 302         if (unlikely(sparc_mmap_check(new_addr, new_len)))
 303                 goto out;
 304         down_write(&current->mm->mmap_sem);
 305         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 306         up_write(&current->mm->mmap_sem);
 307 out:
 308         return ret;
 309 }
 310
 311 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 312 asmlinkage unsigned long
 313 c_sys_nis_syscall (struct pt_regs *regs)
 314 {
 315         static int count = 0;
 316
 317         if (count++ > 5)
 318                 return -ENOSYS;
 319         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 320                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 321 #ifdef DEBUG_UNIMP_SYSCALL
 322         show_regs (regs);
 323 #endif
 324         return -ENOSYS;
 325 }
 326
 327 /* #define DEBUG_SPARC_BREAKPOINT */
 328
 329 asmlinkage void
 330 sparc_breakpoint (struct pt_regs *regs)
 331 {
 332         siginfo_t info;
 333
 334         lock_kernel();
 335 #ifdef DEBUG_SPARC_BREAKPOINT
 336         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 337 #endif
 338         info.si_signo = SIGTRAP;
 339         info.si_errno = 0;
 340         info.si_code = TRAP_BRKPT;
 341         info.si_addr = (void __user *)regs->pc;
 342         info.si_trapno = 0;
 343         force_sig_info(SIGTRAP, &info, current);
 344
 345 #ifdef DEBUG_SPARC_BREAKPOINT
 346         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 347 #endif
 348         unlock_kernel();
 349 }
 350
 351 asmlinkage int
 352 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 353                  struct old_sigaction __user *oact)
 354 {
 355         struct k_sigaction new_ka, old_ka;
 356         int ret;
 357
 358         WARN_ON_ONCE(sig >= 0);
 359         sig = -sig;
 360
 361         if (act) {
 362                 unsigned long mask;
 363
 364                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 365                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 366                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 367                         return -EFAULT;
 368                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 369                 __get_user(mask, &act->sa_mask);
 370                 siginitset(&new_ka.sa.sa_mask, mask);
 371                 new_ka.ka_restorer = NULL;
 372         }
 373
 374         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 375
 376         if (!ret && oact) {
 377                 /* In the clone() case we could copy half consistent
 378                  * state to the user, however this could sleep and
 379                  * deadlock us if we held the signal lock on SMP.  So for
 380                  * now I take the easy way out and do no locking.
 381                  */
 382                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 383                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 384                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 385                         return -EFAULT;
 386                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 387                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 388         }
 389
 390         return ret;
 391 }
 392
 393 asmlinkage long
 394 sys_rt_sigaction(int sig,
 395                  const struct sigaction __user *act,
 396                  struct sigaction __user *oact,
 397                  void __user *restorer,
 398                  size_t sigsetsize)
 399 {
 400         struct k_sigaction new_ka, old_ka;
 401         int ret;
 402
 403         /* XXX: Don't preclude handling different sized sigset_t's.  */
 404         if (sigsetsize != sizeof(sigset_t))
 405                 return -EINVAL;
 406
 407         if (act) {
 408                 new_ka.ka_restorer = restorer;
 409                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 410                         return -EFAULT;
 411         }
 412
 413         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 414
 415         if (!ret && oact) {
 416                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 417                         return -EFAULT;
 418         }
 419
 420         return ret;
 421 }
 422
 423 asmlinkage int sys_getdomainname(char __user *name, int len)
 424 {
 425         int nlen, err;
 426
 427         if (len < 0)
 428                 return -EINVAL;
 429
 430         down_read(&uts_sem);
 431
 432         nlen = strlen(utsname()->domainname) + 1;
 433         err = -EINVAL;
 434         if (nlen > len)
 435                 goto out;
 436
 437         err = -EFAULT;
 438         if (!copy_to_user(name, utsname()->domainname, nlen))
 439                 err = 0;
 440
 441 out:
 442         up_read(&uts_sem);
 443         return err;
 444 }
 445
 446 /*
 447  * Do a system call from kernel instead of calling sys_execve so we
 448  * end up with proper pt_regs.
 449  */
 450 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 451 {
 452         long __res;
 453         register long __g1 __asm__ ("g1") = __NR_execve;
 454         register long __o0 __asm__ ("o0") = (long)(filename);
 455         register long __o1 __asm__ ("o1") = (long)(argv);
 456         register long __o2 __asm__ ("o2") = (long)(envp);
 457         asm volatile ("t 0x10\n\t"
 458                       "bcc 1f\n\t"
 459                       "mov %%o0, %0\n\t"
 460                       "sub %%g0, %%o0, %0\n\t"
 461                       "1:\n\t"
 462                       : "=r" (__res), "=&r" (__o0)
 463                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 464                       : "cc");
 465         return __res;
 466 }