arch/sparc/kernel/sys_sparc_32.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) &&
  49                     ((addr - (pgoff << PAGE_SHIFT)) & (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 && 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 && 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 /*
  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_flags(fd, 0);
  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 __user *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_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
 118                         goto out;
 119                 case SEMTIMEDOP:
 120                         err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
 121                         goto out;
 122                 case SEMGET:
 123                         err = sys_semget (first, second, third);
 124                         goto out;
 125                 case SEMCTL: {
 126                         union semun fourth;
 127                         err = -EINVAL;
 128                         if (!ptr)
 129                                 goto out;
 130                         err = -EFAULT;
 131                         if (get_user(fourth.__pad,
 132                                      (void __user * __user *)ptr))
 133                                 goto out;
 134                         err = sys_semctl (first, second, third, fourth);
 135                         goto out;
 136                         }
 137                 default:
 138                         err = -ENOSYS;
 139                         goto out;
 140                 }
 141         if (call <= MSGCTL)
 142                 switch (call) {
 143                 case MSGSND:
 144                         err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
 145                                           second, third);
 146                         goto out;
 147                 case MSGRCV:
 148                         switch (version) {
 149                         case 0: {
 150                                 struct ipc_kludge tmp;
 151                                 err = -EINVAL;
 152                                 if (!ptr)
 153                                         goto out;
 154                                 err = -EFAULT;
 155                                 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
 156                                         goto out;
 157                                 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
 158                                 goto out;
 159                                 }
 160                         case 1: default:
 161                                 err = sys_msgrcv (first,
 162                                                   (struct msgbuf __user *) ptr,
 163                                                   second, fifth, third);
 164                                 goto out;
 165                         }
 166                 case MSGGET:
 167                         err = sys_msgget ((key_t) first, second);
 168                         goto out;
 169                 case MSGCTL:
 170                         err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 171                         goto out;
 172                 default:
 173                         err = -ENOSYS;
 174                         goto out;
 175                 }
 176         if (call <= SHMCTL)
 177                 switch (call) {
 178                 case SHMAT:
 179                         switch (version) {
 180                         case 0: default: {
 181                                 ulong raddr;
 182                                 err = do_shmat (first, (char __user *) ptr, second, &raddr);
 183                                 if (err)
 184                                         goto out;
 185                                 err = -EFAULT;
 186                                 if (put_user (raddr, (ulong __user *) third))
 187                                         goto out;
 188                                 err = 0;
 189                                 goto out;
 190                                 }
 191                         case 1: /* iBCS2 emulator entry point */
 192                                 err = -EINVAL;
 193                                 goto out;
 194                         }
 195                 case SHMDT:
 196                         err = sys_shmdt ((char __user *)ptr);
 197                         goto out;
 198                 case SHMGET:
 199                         err = sys_shmget (first, second, third);
 200                         goto out;
 201                 case SHMCTL:
 202                         err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 203                         goto out;
 204                 default:
 205                         err = -ENOSYS;
 206                         goto out;
 207                 }
 208         else
 209                 err = -ENOSYS;
 210 out:
 211         return err;
 212 }
 213
 214 int sparc_mmap_check(unsigned long addr, unsigned long len)
 215 {
 216         if (ARCH_SUN4C &&
 217             (len > 0x20000000 ||
 218              (addr < 0xe0000000 && addr + len > 0x20000000)))
 219                 return -EINVAL;
 220
 221         /* See asm-sparc/uaccess.h */
 222         if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
 223                 return -EINVAL;
 224
 225         return 0;
 226 }
 227
 228 /* Linux version of mmap */
 229
 230 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 231         unsigned long prot, unsigned long flags, unsigned long fd,
 232         unsigned long pgoff)
 233 {
 234         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 235            we have. */
 236         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 237                               pgoff >> (PAGE_SHIFT - 12));
 238 }
 239
 240 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 241         unsigned long prot, unsigned long flags, unsigned long fd,
 242         unsigned long off)
 243 {
 244         /* no alignment check? */
 245         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 246 }
 247
 248 long sparc_remap_file_pages(unsigned long start, unsigned long size,
 249                            unsigned long prot, unsigned long pgoff,
 250                            unsigned long flags)
 251 {
 252         /* This works on an existing mmap so we don't need to validate
 253          * the range as that was done at the original mmap call.
 254          */
 255         return sys_remap_file_pages(start, size, prot,
 256                                     (pgoff >> (PAGE_SHIFT - 12)), flags);
 257 }
 258
 259 /* we come to here via sys_nis_syscall so it can setup the regs argument */
 260 asmlinkage unsigned long
 261 c_sys_nis_syscall (struct pt_regs *regs)
 262 {
 263         static int count = 0;
 264
 265         if (count++ > 5)
 266                 return -ENOSYS;
 267         printk ("%s[%d]: Unimplemented SPARC system call %d\n",
 268                 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 269 #ifdef DEBUG_UNIMP_SYSCALL
 270         show_regs (regs);
 271 #endif
 272         return -ENOSYS;
 273 }
 274
 275 /* #define DEBUG_SPARC_BREAKPOINT */
 276
 277 asmlinkage void
 278 sparc_breakpoint (struct pt_regs *regs)
 279 {
 280         siginfo_t info;
 281
 282         lock_kernel();
 283 #ifdef DEBUG_SPARC_BREAKPOINT
 284         printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
 285 #endif
 286         info.si_signo = SIGTRAP;
 287         info.si_errno = 0;
 288         info.si_code = TRAP_BRKPT;
 289         info.si_addr = (void __user *)regs->pc;
 290         info.si_trapno = 0;
 291         force_sig_info(SIGTRAP, &info, current);
 292
 293 #ifdef DEBUG_SPARC_BREAKPOINT
 294         printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
 295 #endif
 296         unlock_kernel();
 297 }
 298
 299 asmlinkage int
 300 sparc_sigaction (int sig, const struct old_sigaction __user *act,
 301                  struct old_sigaction __user *oact)
 302 {
 303         struct k_sigaction new_ka, old_ka;
 304         int ret;
 305
 306         WARN_ON_ONCE(sig >= 0);
 307         sig = -sig;
 308
 309         if (act) {
 310                 unsigned long mask;
 311
 312                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 313                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 314                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
 315                         return -EFAULT;
 316                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 317                 __get_user(mask, &act->sa_mask);
 318                 siginitset(&new_ka.sa.sa_mask, mask);
 319                 new_ka.ka_restorer = NULL;
 320         }
 321
 322         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 323
 324         if (!ret && oact) {
 325                 /* In the clone() case we could copy half consistent
 326                  * state to the user, however this could sleep and
 327                  * deadlock us if we held the signal lock on SMP.  So for
 328                  * now I take the easy way out and do no locking.
 329                  */
 330                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 331                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 332                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
 333                         return -EFAULT;
 334                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 335                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
 336         }
 337
 338         return ret;
 339 }
 340
 341 asmlinkage long
 342 sys_rt_sigaction(int sig,
 343                  const struct sigaction __user *act,
 344                  struct sigaction __user *oact,
 345                  void __user *restorer,
 346                  size_t sigsetsize)
 347 {
 348         struct k_sigaction new_ka, old_ka;
 349         int ret;
 350
 351         /* XXX: Don't preclude handling different sized sigset_t's.  */
 352         if (sigsetsize != sizeof(sigset_t))
 353                 return -EINVAL;
 354
 355         if (act) {
 356                 new_ka.ka_restorer = restorer;
 357                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
 358                         return -EFAULT;
 359         }
 360
 361         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 362
 363         if (!ret && oact) {
 364                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
 365                         return -EFAULT;
 366         }
 367
 368         return ret;
 369 }
 370
 371 asmlinkage int sys_getdomainname(char __user *name, int len)
 372 {
 373         int nlen, err;
 374
 375         if (len < 0)
 376                 return -EINVAL;
 377
 378         down_read(&uts_sem);
 379
 380         nlen = strlen(utsname()->domainname) + 1;
 381         err = -EINVAL;
 382         if (nlen > len)
 383                 goto out;
 384
 385         err = -EFAULT;
 386         if (!copy_to_user(name, utsname()->domainname, nlen))
 387                 err = 0;
 388
 389 out:
 390         up_read(&uts_sem);
 391         return err;
 392 }
 393
 394 /*
 395  * Do a system call from kernel instead of calling sys_execve so we
 396  * end up with proper pt_regs.
 397  */
 398 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 399 {
 400         long __res;
 401         register long __g1 __asm__ ("g1") = __NR_execve;
 402         register long __o0 __asm__ ("o0") = (long)(filename);
 403         register long __o1 __asm__ ("o1") = (long)(argv);
 404         register long __o2 __asm__ ("o2") = (long)(envp);
 405         asm volatile ("t 0x10\n\t"
 406                       "bcc 1f\n\t"
 407                       "mov %%o0, %0\n\t"
 408                       "sub %%g0, %%o0, %0\n\t"
 409                       "1:\n\t"
 410                       : "=r" (__res), "=&r" (__o0)
 411                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
 412                       : "cc");
 413         return __res;
 414 }