linux/arch/cris/kernel/sys_cris.c
<<
>>
Prefs
   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/* common code for old and new mmaps */
  31static inline long
  32do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  33        unsigned long flags, unsigned long fd, unsigned long pgoff)
  34{
  35        int error = -EBADF;
  36        struct file * file = NULL;
  37
  38        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  39        if (!(flags & MAP_ANONYMOUS)) {
  40                file = fget(fd);
  41                if (!file)
  42                        goto out;
  43        }
  44
  45        down_write(&current->mm->mmap_sem);
  46        error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  47        up_write(&current->mm->mmap_sem);
  48
  49        if (file)
  50                fput(file);
  51out:
  52        return error;
  53}
  54
  55asmlinkage unsigned long old_mmap(unsigned long __user *args)
  56{        
  57        unsigned long buffer[6];
  58        int err = -EFAULT;
  59
  60        if (copy_from_user(&buffer, args, sizeof(buffer)))
  61                goto out;
  62
  63        err = -EINVAL;
  64        if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */
  65                goto out;
  66
  67        err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3],
  68                       buffer[4], buffer[5] >> PAGE_SHIFT);
  69out:
  70        return err;
  71}
  72
  73asmlinkage long
  74sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  75          unsigned long flags, unsigned long fd, unsigned long pgoff)
  76{
  77        return do_mmap2(addr, len, prot, flags, fd, pgoff);
  78}
  79
  80/*
  81 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  82 *
  83 * This is really horribly ugly. (same as arch/i386)
  84 */
  85
  86asmlinkage int sys_ipc (uint call, int first, int second,
  87                        int third, void __user *ptr, long fifth)
  88{
  89        int version, ret;
  90
  91        version = call >> 16; /* hack for backward compatibility */
  92        call &= 0xffff;
  93
  94        switch (call) {
  95        case SEMOP:
  96                return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
  97        case SEMTIMEDOP:
  98                return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
  99                                        (const struct timespec __user *)fifth);
 100
 101        case SEMGET:
 102                return sys_semget (first, second, third);
 103        case SEMCTL: {
 104                union semun fourth;
 105                if (!ptr)
 106                        return -EINVAL;
 107                if (get_user(fourth.__pad, (void * __user *) ptr))
 108                        return -EFAULT;
 109                return sys_semctl (first, second, third, fourth);
 110        }
 111
 112        case MSGSND:
 113                return sys_msgsnd (first, (struct msgbuf __user *) ptr, 
 114                                   second, third);
 115        case MSGRCV:
 116                switch (version) {
 117                case 0: {
 118                        struct ipc_kludge tmp;
 119                        if (!ptr)
 120                                return -EINVAL;
 121                        
 122                        if (copy_from_user(&tmp,
 123                                           (struct ipc_kludge __user *) ptr, 
 124                                           sizeof (tmp)))
 125                                return -EFAULT;
 126                        return sys_msgrcv (first, tmp.msgp, second,
 127                                           tmp.msgtyp, third);
 128                }
 129                default:
 130                        return sys_msgrcv (first,
 131                                           (struct msgbuf __user *) ptr,
 132                                           second, fifth, third);
 133                }
 134        case MSGGET:
 135                return sys_msgget ((key_t) first, second);
 136        case MSGCTL:
 137                return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 138
 139        case SHMAT: {
 140                ulong raddr;
 141                ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 142                if (ret)
 143                        return ret;
 144                return put_user (raddr, (ulong __user *) third);
 145        }
 146        case SHMDT: 
 147                return sys_shmdt ((char __user *)ptr);
 148        case SHMGET:
 149                return sys_shmget (first, second, third);
 150        case SHMCTL:
 151                return sys_shmctl (first, second,
 152                                   (struct shmid_ds __user *) ptr);
 153        default:
 154                return -ENOSYS;
 155        }
 156}
 157