/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
* Licensed under the GPL
*/
#ifndef __UM_UACCESS_H
#define __UM_UACCESS_H
-/* thread_info has a mm_segment_t in it, so put the definition up here */
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
-#include <linux/thread_info.h>
-#include <linux/errno.h>
-#include <asm/processor.h>
+#include <asm/thread_info.h>
#include <asm/elf.h>
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
-
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- */
-
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
-#define USER_DS MAKE_MM_SEG(TASK_SIZE)
-
-#define get_ds() (KERNEL_DS)
-#define get_fs() (current_thread_info()->addr_limit)
-#define set_fs(x) (current_thread_info()->addr_limit = (x))
-
-#define segment_eq(a, b) ((a).seg == (b).seg)
-
#define __under_task_size(addr, size) \
(((unsigned long) (addr) < TASK_SIZE) && \
(((unsigned long) (addr) + (size)) < TASK_SIZE))
-#define __access_ok_vsyscall(type, addr, size) \
- ((type == VERIFY_READ) && \
- ((unsigned long) (addr) >= FIXADDR_USER_START) && \
+#define __access_ok_vsyscall(addr, size) \
+ (((unsigned long) (addr) >= FIXADDR_USER_START) && \
((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
#define __addr_range_nowrap(addr, size) \
((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
-#define access_ok(type, addr, size) \
- (__addr_range_nowrap(addr, size) && \
- (__under_task_size(addr, size) || \
- __access_ok_vsyscall(type, addr, size) || \
- segment_eq(get_fs(), KERNEL_DS)))
-
-extern int copy_from_user(void *to, const void __user *from, int n);
-extern int copy_to_user(void __user *to, const void *from, int n);
-
-/*
- * strncpy_from_user: - Copy a NUL terminated string from userspace.
- * @dst: Destination address, in kernel space. This buffer must be at
- * least @count bytes long.
- * @src: Source address, in user space.
- * @count: Maximum number of bytes to copy, including the trailing NUL.
- *
- * Copies a NUL-terminated string from userspace to kernel space.
- *
- * On success, returns the length of the string (not including the trailing
- * NUL).
- *
- * If access to userspace fails, returns -EFAULT (some data may have been
- * copied).
- *
- * If @count is smaller than the length of the string, copies @count bytes
- * and returns @count.
- */
-
-extern int strncpy_from_user(char *dst, const char __user *src, int count);
-
-/*
- * __clear_user: - Zero a block of memory in user space, with less checking.
- * @to: Destination address, in user space.
- * @n: Number of bytes to zero.
- *
- * Zero a block of memory in user space. Caller must check
- * the specified block with access_ok() before calling this function.
- *
- * Returns number of bytes that could not be cleared.
- * On success, this will be zero.
- */
-extern int __clear_user(void __user *mem, int len);
-
-/*
- * clear_user: - Zero a block of memory in user space.
- * @to: Destination address, in user space.
- * @n: Number of bytes to zero.
- *
- * Zero a block of memory in user space.
- *
- * Returns number of bytes that could not be cleared.
- * On success, this will be zero.
- */
-extern int clear_user(void __user *mem, int len);
-
-/*
- * strlen_user: - Get the size of a string in user space.
- * @str: The string to measure.
- * @n: The maximum valid length
- *
- * Get the size of a NUL-terminated string in user space.
- *
- * Returns the size of the string INCLUDING the terminating NUL.
- * On exception, returns 0.
- * If the string is too long, returns a value greater than @n.
- */
-extern int strnlen_user(const void __user *str, int len);
-
-#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
-
-#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
-
+extern long __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern long __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern long __strncpy_from_user(char *dst, const char __user *src, long count);
+extern long __strnlen_user(const void __user *str, long len);
+extern unsigned long __clear_user(void __user *mem, unsigned long len);
+static inline int __access_ok(unsigned long addr, unsigned long size);
+
+/* Teach asm-generic/uaccess.h that we have C functions for these. */
+#define __access_ok __access_ok
+#define __clear_user __clear_user
+#define __copy_to_user __copy_to_user
+#define __copy_from_user __copy_from_user
+#define __strnlen_user __strnlen_user
+#define __strncpy_from_user __strncpy_from_user
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
-#define __get_user(x, ptr) \
-({ \
- const __typeof__(*(ptr)) __user *__private_ptr = (ptr); \
- __typeof__(x) __private_val; \
- int __private_ret = -EFAULT; \
- (x) = (__typeof__(*(__private_ptr)))0; \
- if (__copy_from_user((__force void *)&__private_val, (__private_ptr),\
- sizeof(*(__private_ptr))) == 0) { \
- (x) = (__typeof__(*(__private_ptr))) __private_val; \
- __private_ret = 0; \
- } \
- __private_ret; \
-})
-
-#define get_user(x, ptr) \
-({ \
- const __typeof__((*(ptr))) __user *private_ptr = (ptr); \
- (access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \
- __get_user(x, private_ptr) : ((x) = (__typeof__(*ptr))0, -EFAULT)); \
-})
-
-#define __put_user(x, ptr) \
-({ \
- __typeof__(*(ptr)) __user *__private_ptr = ptr; \
- __typeof__(*(__private_ptr)) __private_val; \
- int __private_ret = -EFAULT; \
- __private_val = (__typeof__(*(__private_ptr))) (x); \
- if (__copy_to_user((__private_ptr), &__private_val, \
- sizeof(*(__private_ptr))) == 0) { \
- __private_ret = 0; \
- } \
- __private_ret; \
-})
-
-#define put_user(x, ptr) \
-({ \
- __typeof__(*(ptr)) __user *private_ptr = (ptr); \
- (access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \
- __put_user(x, private_ptr) : -EFAULT); \
-})
-
-#define strlen_user(str) strnlen_user(str, ~0U >> 1)
+#include <asm-generic/uaccess.h>
-struct exception_table_entry
+static inline int __access_ok(unsigned long addr, unsigned long size)
{
- unsigned long insn;
- unsigned long fixup;
-};
+ return __addr_range_nowrap(addr, size) &&
+ (__under_task_size(addr, size) ||
+ __access_ok_vsyscall(addr, size) ||
+ segment_eq(get_fs(), KERNEL_DS));
+}
#endif
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