Esempio n. 1
0
static inline int __strncpy_from_user_page(char * to, const char * from,
        unsigned long n)
{
    unsigned long page, offset, flags;

#ifdef DEBUG_MEMCPY_FROMFS
    printk("%s: to: %p, from: %p, len: %08lx\n",
           __func__, to, from, n);
#endif
    page = parse_ptabs_read((unsigned long)from, &offset, &flags);
    if (page != -EFAULT) {
#ifdef DEBUG_MEMCPY_FROMFS
        printk("    %s reading from: %08lx len: 0x%lx\n",
               __func__, (page + offset), n);
#endif
        /* after finishing the copy operation count is either
         * - zero: max number of bytes copied or
         * - non zero: end of string reached, n containing the
         *             number of remaining bytes
         */
        __do_strncpy_from_user_page(to, (char *)(page + offset), n);
        local_irq_restore(flags);
        return n;
    }
    log_efault(__func__, from, to, n);
    return -EFAULT;
}
Esempio n. 2
0
static inline int __clear_user_page(void * address, unsigned long n)
{
	unsigned long page, offset;

#ifdef DEBUG_MEMCPY_TOFS
	printk("%s: %p, len: %08lx\n", __func__, address, n);
#endif
	page = parse_ptabs_write((unsigned long)address, &offset);
	if (page != -EFAULT) {
#ifdef DEBUG_MEMCPY_TOFS
		printk("    writing to: %08lx\n", (page + offset));
#endif
		memset((void *)(page + offset), 0, n);
		return 0;
	}
	log_efault(__func__, address, 0, n);
	return -EFAULT;
}
Esempio n. 3
0
static inline int __copy_from_user_page(void *to, const void *from,
					unsigned long n)
{
	unsigned long page, offset;

#ifdef DEBUG_MEMCPY_FROMFS
	printk("%s to: %p, from: %p, len: %08lx\n", __func__, to, from, n);
#endif
	if ((page = parse_ptabs_read((unsigned long)from, &offset)) != -EFAULT) {
#ifdef DEBUG_MEMCPY_FROMFS
		printk("  %s reading from: %08lx\n",
		       __func__, (page + offset));
#endif
		memcpy(to, (void *)(page + offset), n);
		return 0;
	}
	log_efault(__func__, from, to, n);
	return -EFAULT;
}
Esempio n. 4
0
static inline int __copy_to_user_page(void *to, const void *from,
				      unsigned long n)
{
	unsigned long page, offset;

#ifdef DEBUG_MEMCPY_TOFS
	printk("__copy_to_user_page to: %p, from: %p, len: %08lx\n",
	       to, from, n);
#endif
	if ((page = parse_ptabs_write((unsigned long)to, &offset)) != -EFAULT) {
#ifdef DEBUG_MEMCPY_TOFS
		printk("    __copy_to_user_page writing to: %08lx\n",
		       (page + offset));
#endif
		memcpy((void *)(page + offset), from, n);
		return 0;
	}
	log_efault("__copy_to_user_page", to, from, n);
	return -EFAULT;
}