LXR linux-old/arch/sparc64/lib/user

   1/* user_fixup.c: Fix up user copy faults.
   2 *
   3 * Copyright (C) 2004 David S. Miller <davem@redhat.com>
   4 */
   5
   6#include <linux/compiler.h>
   7#include <linux/kernel.h>
   8#include <linux/string.h>
   9#include <linux/errno.h>
  10#include <asm/uaccess.h>
  11
  12/* Calculating the exact fault address when using
  13 * block loads and stores can be very complicated.
  14 * Instead of trying to be clever and handling all
  15 * of the cases, just fix things up simply here.
  16 */
  17
  18unsigned long copy_from_user_fixup(void *to, const void __user *from, unsigned long size)
  19{
  20        char *dst = to;
  21        const char __user *src = from;
  22
  23        while (size--) {
  24                if (__get_user(*dst, src))
  25                        break;
  26                dst++;
  27                src++;
  28        }
  29
  30        if (size)
  31                memset(dst, 0, size);
  32
  33        return size;
  34}
  35
  36unsigned long copy_to_user_fixup(void __user *to, const void *from, unsigned long size)
  37{
  38        char __user *dst = to;
  39        const char *src = from;
  40
  41        while (size--) {
  42                if (__put_user(*src, dst))
  43                        break;
  44                dst++;
  45                src++;
  46        }
  47
  48        return size;
  49}
  50
  51unsigned long copy_in_user_fixup(void __user *to, void __user *from, unsigned long size)
  52{
  53        char __user *dst = to;
  54        char __user *src = from;
  55
  56        while (size--) {
  57                char tmp;
  58
  59                if (__get_user(tmp, src))
  60                        break;
  61                if (__put_user(tmp, dst))
  62                        break;
  63                dst++;
  64                src++;
  65        }
  66
  67        return size;
  68}
  69