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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 #include <asm/unistd.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 int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
 224 {
 225         if (ARCH_SUN4C_SUN4 &&
 226             (len > 0x20000000 ||
 227              ((flags & MAP_FIXED) &&
 228               addr < 0xe0000000 && addr + len > 0x20000000)))
 229                 return -EINVAL;
 230
 231         /* See asm-sparc/uaccess.h */
 232         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 233                 return -EINVAL;
 234
 235         return 0;
 236 }
 237
 238 /* Linux version of mmap */
 239 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 240         unsigned long prot, unsigned long flags, unsigned long fd,
 241         unsigned long pgoff)
 242 {
 243         struct file * file = NULL;
 244         unsigned long retval = -EBADF;
 245
 246         if (!(flags & MAP_ANONYMOUS)) {
 247                 file = fget(fd);
 248                 if (!file)
 249                         goto out;
 250         }
 251
 252         len = PAGE_ALIGN(len);
 253         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 254
 255         down_write(&current->mm->mmap_sem);
 256         retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 257         up_write(&current->mm->mmap_sem);
 258
 259         if (file)
 260                 fput(file);
 261 out:
 262         return retval;
 263 }
 264
 265 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 266         unsigned long prot, unsigned long flags, unsigned long fd,
 267         unsigned long pgoff)
 268 {
 269         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 270            we have. */
 271         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 272 }
 273
 274 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 275         unsigned long prot, unsigned long flags, unsigned long fd,
 276         unsigned long off)
 277 {
 278         return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 279 }
 280
 281 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 282                            unsigned long prot, unsigned long pgoff,
 283                            unsigned long flags)
 284 {
 285         /* This works on an existing mmap so we don't need to validate
 286          * the range as that was done at the original mmap call.
 287          */
 288         return sys_remap_file_pages(start, size, prot,
 289                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 290 }
 291
 292 extern unsigned long do_mremap(unsigned long addr,
 293         unsigned long old_len, unsigned long new_len,
 294         unsigned long flags, unsigned long new_addr);
 295
 296 asmlinkage unsigned long sparc_mremap(unsigned long addr,
 297         unsigned long old_len, unsigned long new_len,
 298         unsigned long flags, unsigned long new_addr)
 299 {
 300         struct vm_area_struct *vma;
 301         unsigned long ret = -EINVAL;
 302         if (ARCH_SUN4C_SUN4) {
 303                 if (old_len > 0x20000000 || new_len > 0x20000000)
 304                         goto out;
 305                 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
 306                         goto out;
 307         }
 308         if (old_len > TASK_SIZE - PAGE_SIZE ||
 309             new_len > TASK_SIZE - PAGE_SIZE)
 310                 goto out;
 311         down_write(&current->mm->mmap_sem);
 312         if (flags & MREMAP_FIXED) {
 313                 if (ARCH_SUN4C_SUN4 &&
 314                     new_addr < 0xe0000000 &&
 315                     new_addr + new_len > 0x20000000)
 316                         goto out_sem;
 317                 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
 318                         goto out_sem;
 319         } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
 320                     addr + new_len > 0x20000000) ||
 321                    addr + new_len > TASK_SIZE - PAGE_SIZE) {
 322                 unsigned long map_flags = 0;
 323                 struct file *file = NULL;
 324
 325                 ret = -ENOMEM;
 326                 if (!(flags & MREMAP_MAYMOVE))
 327                         goto out_sem;
 328
 329                 vma = find_vma(current->mm, addr);
 330                 if (vma) {
 331                         if (vma->vm_flags & VM_SHARED)
 332                                 map_flags |= MAP_SHARED;
 333                         file = vma->vm_file;
 334                 }
 335
 336                 new_addr = get_unmapped_area(file, addr, new_len,
 337                                      vma ? vma->vm_pgoff : 0,
 338                                      map_flags);
 339                 ret = new_addr;
 340                 if (new_addr & ~PAGE_MASK)
 341                         goto out_sem;
 342                 flags |= MREMAP_FIXED;
 343         }
 344         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
 345 out_sem:
 346         up_write(&current->mm->mmap_sem);
 347 out:
 348         return ret;
 349 }
 350
 351 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 352 asmlinkage unsigned long
 353 c_sys_nis_syscall (struct pt_regs *regs)
 354 {
 355         static int count = 0;
 356
 357         if (count++ > 5)
 358                 return -ENOSYS;
 359         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 360                 current->comm, current->pid, (int)regs->u_regs[1]);
 361 #ifdef DEBUG_UNIMP_SYSCALL
 362         show_regs (regs);
 363 #endif
 364         return -ENOSYS;
 365 }
 366
 367 /* #define DEBUG_SPARC_BREAKPOINT */
 368
 369 asmlinkage void
 370 sparc_breakpoint (struct pt_regs *regs)
 371 {
 372         siginfo_t info;
 373
 374         lock_kernel();
 375 #ifdef DEBUG_SPARC_BREAKPOINT
 376         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 377 #endif
 378         info.si_signo = SIGTRAP;
 379         info.si_errno = 0;
 380         info.si_code = TRAP_BRKPT;
 381         info.si_addr = (void __user *)regs->pc;
 382         info.si_trapno = 0;
 383         force_sig_info(SIGTRAP, &info, current);
 384
 385 #ifdef DEBUG_SPARC_BREAKPOINT
 386         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 387 #endif
 388         unlock_kernel();
 389 }
 390
 391 asmlinkage int
 392 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 393                  struct old_sigaction __user *oact)
 394 {
 395         struct k_sigaction new_ka, old_ka;
 396         int ret;
 397
 398         if (sig < 0) {
 399                 current->thread.new_signal = 1;
 400                 sig = -sig;
 401         }
 402
 403         if (act) {
 404                 unsigned long mask;
 405
 406                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 407                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 408                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 409                         return -EFAULT;
 410                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 411                 __get_user(mask, &act->sa_mask);
 412                 siginitset(&new_ka.sa.sa_mask, mask);
 413                 new_ka.ka_restorer = NULL;
 414         }
 415
 416         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 417
 418         if (!ret && oact) {
 419                 /* In the clone() case we could copy half consistent
 420                  * state to the user, however this could sleep and
 421                  * deadlock us if we held the signal lock on SMP.  So for
 422                  * now I take the easy way out and do no locking.
 423                  */
 424                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 425                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 426                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 427                         return -EFAULT;
 428                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 429                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 430         }
 431
 432         return ret;
 433 }
 434
 435 asmlinkage long
 436 sys_rt_sigaction(int sig,
 437                  const struct sigaction __user *act,
 438                  struct sigaction __user *oact,
 439                  void __user *restorer,
 440                  size_t sigsetsize)
 441 {
 442         struct k_sigaction new_ka, old_ka;
 443         int ret;
 444
 445         /* XXX: Don't preclude handling different sized sigset_t's.  */
 446         if (sigsetsize != sizeof(sigset_t))
 447                 return -EINVAL;
 448
 449         /* All tasks which use RT signals (effectively) use
 450          * new style signals.
 451          */
 452         current->thread.new_signal = 1;
 453
 454         if (act) {
 455                 new_ka.ka_restorer = restorer;
 456                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 457                         return -EFAULT;
 458         }
 459
 460         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 461
 462         if (!ret && oact) {
 463                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 464                         return -EFAULT;
 465         }
 466
 467         return ret;
 468 }
 469
 470 asmlinkage int sys_getdomainname(char __user *name, int len)
 471 {
 472         int nlen, err;
 473
 474         if (len < 0)
 475                 return -EINVAL;
 476
 477         down_read(&uts_sem);
 478
 479         nlen = strlen(utsname()->domainname) + 1;
 480         err = -EINVAL;
 481         if (nlen > len)
 482                 goto out;
 483
 484         err = -EFAULT;
 485         if (!copy_to_user(name, utsname()->domainname, nlen))
 486                 err = 0;
 487
 488 out:
 489         up_read(&uts_sem);
 490         return err;
 491 }
 492
 493 /*
 494  * Do a system call from kernel instead of calling sys_execve so we
 495  * end up with proper pt_regs.
 496  */
 497 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 498 {
 499         long __res;
 500         register long __g1 __asm__ ("g1") = __NR_execve;
 501         register long __o0 __asm__ ("o0") = (long)(filename);
 502         register long __o1 __asm__ ("o1") = (long)(argv);
 503         register long __o2 __asm__ ("o2") = (long)(envp);
 504         asm volatile ("t 0x10\n\t"
 505                       "bcc 1f\n\t"
 506                       "mov %%o0, %0\n\t"
 507                       "sub %%g0, %%o0, %0\n\t"
 508                       "1:\n\t"
 509                       : "=r" (__res), "=&r" (__o0)
 510                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 511                       : "cc");
 512         return __res;
 513 }