arch/cris/kernel/sys_cris.c

   1 /* $Id: sys_cris.c,v 1.6 2004/03/11 11:38:40 starvik Exp $
   2  *
   3  * linux/arch/cris/kernel/sys_cris.c
   4  *
   5  * This file contains various random system calls that
   6  * have a non-standard calling sequence on some platforms.
   7  * Since we don't have to do any backwards compatibility, our
   8  * versions are done in the most "normal" way possible.
   9  *
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/sched.h>
  14 #include <linux/syscalls.h>
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/smp.h>
  18 #include <linux/smp_lock.h>
  19 #include <linux/sem.h>
  20 #include <linux/msg.h>
  21 #include <linux/shm.h>
  22 #include <linux/stat.h>
  23 #include <linux/mman.h>
  24 #include <linux/file.h>
  25 #include <linux/ipc.h>
  26
  27 #include <asm/uaccess.h>
  28 #include <asm/segment.h>
  29
  30 /*
  31  * sys_pipe() is the normal C calling standard for creating
  32  * a pipe. It's not the way Unix traditionally does this, though.
  33  */
  34 asmlinkage int sys_pipe(unsigned long __user * fildes)
  35 {
  36         int fd[2];
  37         int error;
  38
  39         lock_kernel();
  40         error = do_pipe(fd);
  41         unlock_kernel();
  42         if (!error) {
  43                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  44                         error = -EFAULT;
  45         }
  46         return error;
  47 }
  48
  49 /* common code for old and new mmaps */
  50 static inline long
  51 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  52         unsigned long flags, unsigned long fd, unsigned long pgoff)
  53 {
  54         int error = -EBADF;
  55         struct file * file = NULL;
  56
  57         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  58         if (!(flags & MAP_ANONYMOUS)) {
  59                 file = fget(fd);
  60                 if (!file)
  61                         goto out;
  62         }
  63
  64         down_write(&current->mm->mmap_sem);
  65         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  66         up_write(&current->mm->mmap_sem);
  67
  68         if (file)
  69                 fput(file);
  70 out:
  71         return error;
  72 }
  73
  74 asmlinkage unsigned long old_mmap(unsigned long __user *args)
  75 {
  76         unsigned long buffer[6];
  77         int err = -EFAULT;
  78
  79         if (copy_from_user(&buffer, args, sizeof(buffer)))
  80                 goto out;
  81
  82         err = -EINVAL;
  83         if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */
  84                 goto out;
  85
  86         err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3],
  87                        buffer[4], buffer[5] >> PAGE_SHIFT);
  88 out:
  89         return err;
  90 }
  91
  92 asmlinkage long
  93 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  94           unsigned long flags, unsigned long fd, unsigned long pgoff)
  95 {
  96         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  97 }
  98
  99 /*
 100  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 101  *
 102  * This is really horribly ugly. (same as arch/i386)
 103  */
 104
 105 asmlinkage int sys_ipc (uint call, int first, int second,
 106                         int third, void __user *ptr, long fifth)
 107 {
 108         int version, ret;
 109
 110         version = call >> 16; /* hack for backward compatibility */
 111         call &= 0xffff;
 112
 113         switch (call) {
 114         case SEMOP:
 115                 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
 116         case SEMTIMEDOP:
 117                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
 118                                         (const struct timespec __user *)fifth);
 119
 120         case SEMGET:
 121                 return sys_semget (first, second, third);
 122         case SEMCTL: {
 123                 union semun fourth;
 124                 if (!ptr)
 125                         return -EINVAL;
 126                 if (get_user(fourth.__pad, (void * __user *) ptr))
 127                         return -EFAULT;
 128                 return sys_semctl (first, second, third, fourth);
 129         }
 130
 131         case MSGSND:
 132                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 133                                    second, third);
 134         case MSGRCV:
 135                 switch (version) {
 136                 case 0: {
 137                         struct ipc_kludge tmp;
 138                         if (!ptr)
 139                                 return -EINVAL;
 140
 141                         if (copy_from_user(&tmp,
 142                                            (struct ipc_kludge __user *) ptr,
 143                                            sizeof (tmp)))
 144                                 return -EFAULT;
 145                         return sys_msgrcv (first, tmp.msgp, second,
 146                                            tmp.msgtyp, third);
 147                 }
 148                 default:
 149                         return sys_msgrcv (first,
 150                                            (struct msgbuf __user *) ptr,
 151                                            second, fifth, third);
 152                 }
 153         case MSGGET:
 154                 return sys_msgget ((key_t) first, second);
 155         case MSGCTL:
 156                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 157
 158         case SHMAT: {
 159                 ulong raddr;
 160                 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 161                 if (ret)
 162                         return ret;
 163                 return put_user (raddr, (ulong __user *) third);
 164         }
 165         case SHMDT:
 166                 return sys_shmdt ((char __user *)ptr);
 167         case SHMGET:
 168                 return sys_shmget (first, second, third);
 169         case SHMCTL:
 170                 return sys_shmctl (first, second,
 171                                    (struct shmid_ds __user *) ptr);
 172         default:
 173                 return -ENOSYS;
 174         }
 175 }