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/arch/cris/kernel/sys_cris.c

https://bitbucket.org/evzijst/gittest
C | 174 lines | 133 code | 21 blank | 20 comment | 14 complexity | f5e7cafa9ff0903e7cb2a2dadd18f4ef MD5 | raw file
  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}