/*
* User space memory access functions
*/
-#include <linux/config.h>
#include <linux/errno.h>
#include <linux/thread_info.h>
#include <linux/prefetch.h>
* This needs 33-bit arithmetic. We have a carry...
*/
#define __range_ok(addr,size) ({ \
- unsigned long flag,sum; \
+ unsigned long flag,roksum; \
__chk_user_ptr(addr); \
asm("addl %3,%1 ; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0" \
- :"=&r" (flag), "=r" (sum) \
- :"1" (addr),"g" ((int)(size)),"g" (current_thread_info()->addr_limit.seg)); \
+ :"=&r" (flag), "=r" (roksum) \
+ :"1" (addr),"g" ((int)(size)),"rm" (current_thread_info()->addr_limit.seg)); \
flag; })
/**
const void *from, unsigned long n);
unsigned long __must_check __copy_from_user_ll(void *to,
const void __user *from, unsigned long n);
+unsigned long __must_check __copy_from_user_ll_nozero(void *to,
+ const void __user *from, unsigned long n);
+unsigned long __must_check __copy_from_user_ll_nocache(void *to,
+ const void __user *from, unsigned long n);
+unsigned long __must_check __copy_from_user_ll_nocache_nozero(void *to,
+ const void __user *from, unsigned long n);
/*
* Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a fault
* anything, so this is accurate.
*/
+static __always_inline unsigned long __must_check
+__copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
+{
+ if (__builtin_constant_p(n)) {
+ unsigned long ret;
+
+ switch (n) {
+ case 1:
+ __put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret, 1);
+ return ret;
+ case 2:
+ __put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret, 2);
+ return ret;
+ case 4:
+ __put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret, 4);
+ return ret;
+ }
+ }
+ return __copy_to_user_ll(to, from, n);
+}
+
/**
* __copy_to_user: - Copy a block of data into user space, with less checking.
* @to: Destination address, in user space.
* On success, this will be zero.
*/
static __always_inline unsigned long __must_check
-__copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
+__copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ might_sleep();
+ return __copy_to_user_inatomic(to, from, n);
+}
+
+static __always_inline unsigned long
+__copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
{
+ /* Avoid zeroing the tail if the copy fails..
+ * If 'n' is constant and 1, 2, or 4, we do still zero on a failure,
+ * but as the zeroing behaviour is only significant when n is not
+ * constant, that shouldn't be a problem.
+ */
if (__builtin_constant_p(n)) {
unsigned long ret;
switch (n) {
case 1:
- __put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret, 1);
+ __get_user_size(*(u8 *)to, from, 1, ret, 1);
return ret;
case 2:
- __put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret, 2);
+ __get_user_size(*(u16 *)to, from, 2, ret, 2);
return ret;
case 4:
- __put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret, 4);
+ __get_user_size(*(u32 *)to, from, 4, ret, 4);
return ret;
}
}
- return __copy_to_user_ll(to, from, n);
-}
-
-static __always_inline unsigned long __must_check
-__copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- might_sleep();
- return __copy_to_user_inatomic(to, from, n);
+ return __copy_from_user_ll_nozero(to, from, n);
}
/**
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
+ *
+ * An alternate version - __copy_from_user_inatomic() - may be called from
+ * atomic context and will fail rather than sleep. In this case the
+ * uncopied bytes will *NOT* be padded with zeros. See fs/filemap.h
+ * for explanation of why this is needed.
*/
static __always_inline unsigned long
-__copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
+__copy_from_user(void *to, const void __user *from, unsigned long n)
{
+ might_sleep();
if (__builtin_constant_p(n)) {
unsigned long ret;
return __copy_from_user_ll(to, from, n);
}
+#define ARCH_HAS_NOCACHE_UACCESS
+
+static __always_inline unsigned long __copy_from_user_nocache(void *to,
+ const void __user *from, unsigned long n)
+{
+ might_sleep();
+ if (__builtin_constant_p(n)) {
+ unsigned long ret;
+
+ switch (n) {
+ case 1:
+ __get_user_size(*(u8 *)to, from, 1, ret, 1);
+ return ret;
+ case 2:
+ __get_user_size(*(u16 *)to, from, 2, ret, 2);
+ return ret;
+ case 4:
+ __get_user_size(*(u32 *)to, from, 4, ret, 4);
+ return ret;
+ }
+ }
+ return __copy_from_user_ll_nocache(to, from, n);
+}
+
static __always_inline unsigned long
-__copy_from_user(void *to, const void __user *from, unsigned long n)
+__copy_from_user_inatomic_nocache(void *to, const void __user *from, unsigned long n)
{
- might_sleep();
- return __copy_from_user_inatomic(to, from, n);
+ return __copy_from_user_ll_nocache_nozero(to, from, n);
}
+
unsigned long __must_check copy_to_user(void __user *to,
const void *from, unsigned long n);
unsigned long __must_check copy_from_user(void *to,
projects / linux-drm-fsl-dcu.git / blobdiff