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/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 */
  34asmlinkage 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 */
  50static inline long
  51do_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);
  70out:
  71        return error;
  72}
  73
  74asmlinkage 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);
  88out:
  89        return err;
  90}
  91
  92asmlinkage long
  93sys_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
 105asmlinkage 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}
 176