LXR linux/arch/cris/kernel/sys

   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 */
  33asmlinkage 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 */
  49static inline long
  50do_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);
  69out:
  70        return error;
  71}
  72
  73asmlinkage 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);
  87out:
  88        return err;
  89}
  90
  91asmlinkage long
  92sys_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
 104asmlinkage 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}
 175