157 строки
3.9 KiB
C
157 строки
3.9 KiB
C
/* $Id: sys_cris.c,v 1.6 2004/03/11 11:38:40 starvik Exp $
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*
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* linux/arch/cris/kernel/sys_cris.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on some platforms.
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* Since we don't have to do any backwards compatibility, our
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* versions are done in the most "normal" way possible.
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*
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/syscalls.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/ipc.h>
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#include <asm/uaccess.h>
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#include <asm/segment.h>
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/* common code for old and new mmaps */
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static inline long
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do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
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unsigned long flags, unsigned long fd, unsigned long pgoff)
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{
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int error = -EBADF;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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asmlinkage unsigned long old_mmap(unsigned long __user *args)
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{
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unsigned long buffer[6];
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int err = -EFAULT;
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if (copy_from_user(&buffer, args, sizeof(buffer)))
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goto out;
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err = -EINVAL;
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if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */
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goto out;
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err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3],
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buffer[4], buffer[5] >> PAGE_SHIFT);
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out:
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return err;
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}
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asmlinkage long
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sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
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unsigned long flags, unsigned long fd, unsigned long pgoff)
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{
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return do_mmap2(addr, len, prot, flags, fd, pgoff);
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}
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly. (same as arch/i386)
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*/
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asmlinkage int sys_ipc (uint call, int first, int second,
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int third, void __user *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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switch (call) {
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case SEMOP:
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return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
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case SEMTIMEDOP:
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return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
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(const struct timespec __user *)fifth);
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case SEMGET:
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return sys_semget (first, second, third);
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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return -EINVAL;
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if (get_user(fourth.__pad, (void * __user *) ptr))
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return -EFAULT;
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return sys_semctl (first, second, third, fourth);
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}
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case MSGSND:
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return sys_msgsnd (first, (struct msgbuf __user *) ptr,
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second, third);
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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return -EINVAL;
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if (copy_from_user(&tmp,
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(struct ipc_kludge __user *) ptr,
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sizeof (tmp)))
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return -EFAULT;
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return sys_msgrcv (first, tmp.msgp, second,
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tmp.msgtyp, third);
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}
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default:
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return sys_msgrcv (first,
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(struct msgbuf __user *) ptr,
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second, fifth, third);
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}
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case MSGGET:
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return sys_msgget ((key_t) first, second);
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case MSGCTL:
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return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
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case SHMAT: {
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ulong raddr;
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ret = do_shmat (first, (char __user *) ptr, second, &raddr);
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if (ret)
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return ret;
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return put_user (raddr, (ulong __user *) third);
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}
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case SHMDT:
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return sys_shmdt ((char __user *)ptr);
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case SHMGET:
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return sys_shmget (first, second, third);
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case SHMCTL:
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return sys_shmctl (first, second,
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(struct shmid_ds __user *) ptr);
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default:
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return -ENOSYS;
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}
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}
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