sys_cris.c
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上传日期:2013-02-24
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- /* $Id: sys_cris.c,v 1.10 2001/06/27 21:16:15 hp Exp $
- *
- * linux/arch/cris/kernel/sys_cris.c
- *
- * This file contains various random system calls that
- * have a non-standard calling sequence on some platforms.
- * Since we don't have to do any backwards compatibility, our
- * versions are done in the most "normal" way possible.
- *
- */
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/sem.h>
- #include <linux/msg.h>
- #include <linux/shm.h>
- #include <linux/stat.h>
- #include <linux/mman.h>
- #include <linux/file.h>
- #include <asm/uaccess.h>
- #include <asm/ipc.h>
- #include <asm/segment.h>
- /*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
- asmlinkage int sys_pipe(unsigned long * fildes)
- {
- int fd[2];
- int error;
- lock_kernel();
- error = do_pipe(fd);
- unlock_kernel();
- if (!error) {
- if (copy_to_user(fildes, fd, 2*sizeof(int)))
- error = -EFAULT;
- }
- return error;
- }
- /* common code for old and new mmaps */
- static inline long
- do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
- unsigned long flags, unsigned long fd, unsigned long pgoff)
- {
- int error = -EBADF;
- struct file * file = NULL;
- flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- if (!(flags & MAP_ANONYMOUS)) {
- file = fget(fd);
- if (!file)
- goto out;
- }
- down_write(¤t->mm->mmap_sem);
- error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
- up_write(¤t->mm->mmap_sem);
- if (file)
- fput(file);
- out:
- return error;
- }
- asmlinkage unsigned long old_mmap(unsigned long *args)
- {
- unsigned long buffer[6];
- int err = -EFAULT;
- if (copy_from_user(&buffer, args, sizeof(buffer)))
- goto out;
- err = -EINVAL;
- if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */
- goto out;
- err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3],
- buffer[4], buffer[5] >> PAGE_SHIFT);
- out:
- return err;
- }
- asmlinkage long
- sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
- unsigned long flags, unsigned long fd, unsigned long pgoff)
- {
- return do_mmap2(addr, len, prot, flags, fd, pgoff);
- }
- /*
- * sys_ipc() is the de-multiplexer for the SysV IPC calls..
- *
- * This is really horribly ugly. (same as arch/i386)
- */
- asmlinkage int sys_ipc (uint call, int first, int second,
- int third, void *ptr, long fifth)
- {
- int version, ret;
- version = call >> 16; /* hack for backward compatibility */
- call &= 0xffff;
- switch (call) {
- case SEMOP:
- return sys_semop (first, (struct sembuf *)ptr, second);
- case SEMGET:
- return sys_semget (first, second, third);
- case SEMCTL: {
- union semun fourth;
- if (!ptr)
- return -EINVAL;
- if (get_user(fourth.__pad, (void **) ptr))
- return -EFAULT;
- return sys_semctl (first, second, third, fourth);
- }
- case MSGSND:
- return sys_msgsnd (first, (struct msgbuf *) ptr,
- second, third);
- case MSGRCV:
- switch (version) {
- case 0: {
- struct ipc_kludge tmp;
- if (!ptr)
- return -EINVAL;
-
- if (copy_from_user(&tmp,
- (struct ipc_kludge *) ptr,
- sizeof (tmp)))
- return -EFAULT;
- return sys_msgrcv (first, tmp.msgp, second,
- tmp.msgtyp, third);
- }
- default:
- return sys_msgrcv (first,
- (struct msgbuf *) ptr,
- second, fifth, third);
- }
- case MSGGET:
- return sys_msgget ((key_t) first, second);
- case MSGCTL:
- return sys_msgctl (first, second, (struct msqid_ds *) ptr);
- case SHMAT: {
- ulong raddr;
- ret = sys_shmat (first, (char *) ptr, second, &raddr);
- if (ret)
- return ret;
- return put_user (raddr, (ulong *) third);
- }
- case SHMDT:
- return sys_shmdt ((char *)ptr);
- case SHMGET:
- return sys_shmget (first, second, third);
- case SHMCTL:
- return sys_shmctl (first, second,
- (struct shmid_ds *) ptr);
- default:
- return -EINVAL;
- }
- }
- /* apparently this is legacy - if we don't need this in Linux/CRIS we can remove it. */
- asmlinkage int sys_pause(void)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- return -ERESTARTNOHAND;
- }