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