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-rw-r--r--arch/microblaze/include/asm/uaccess.h155
1 files changed, 22 insertions, 133 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 81f16aadbf9e..3aab2f17e046 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -1,97 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
*/
#ifndef _ASM_MICROBLAZE_UACCESS_H
#define _ASM_MICROBLAZE_UACCESS_H
#include <linux/kernel.h>
-#include <linux/mm.h>
#include <asm/mmu.h>
#include <asm/page.h>
-#include <asm/pgtable.h>
+#include <linux/pgtable.h>
#include <asm/extable.h>
#include <linux/string.h>
+#include <asm-generic/access_ok.h>
-/*
- * On Microblaze the fs value is actually the top of the corresponding
- * address space.
- *
- * 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.
- *
- * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
- */
-# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-# ifndef CONFIG_MMU
-# define KERNEL_DS MAKE_MM_SEG(0)
-# define USER_DS KERNEL_DS
-# else
-# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
-# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
-# endif
-
-# define get_ds() (KERNEL_DS)
-# define get_fs() (current_thread_info()->addr_limit)
-# define set_fs(val) (current_thread_info()->addr_limit = (val))
-
-# define segment_eq(a, b) ((a).seg == (b).seg)
-
-#ifndef CONFIG_MMU
-
-/* Check against bounds of physical memory */
-static inline int ___range_ok(unsigned long addr, unsigned long size)
-{
- return ((addr < memory_start) ||
- ((addr + size - 1) > (memory_start + memory_size - 1)));
-}
-
-#define __range_ok(addr, size) \
- ___range_ok((unsigned long)(addr), (unsigned long)(size))
-
-#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
-
-#else
-
-static inline int access_ok(int type, const void __user *addr,
- unsigned long size)
-{
- if (!size)
- goto ok;
-
- if ((get_fs().seg < ((unsigned long)addr)) ||
- (get_fs().seg < ((unsigned long)addr + size - 1))) {
- pr_devel("ACCESS fail: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
- type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
- (u32)get_fs().seg);
- return 0;
- }
-ok:
- pr_devel("ACCESS OK: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
- type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
- (u32)get_fs().seg);
- return 1;
-}
-#endif
-
-#ifdef CONFIG_MMU
# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
-#else
-# define __FIXUP_SECTION ".section .discard,\"ax\"\n"
-# define __EX_TABLE_SECTION ".section .discard,\"ax\"\n"
-#endif
extern unsigned long __copy_tofrom_user(void __user *to,
const void __user *from, unsigned long size);
@@ -120,7 +47,7 @@ static inline unsigned long __must_check clear_user(void __user *to,
unsigned long n)
{
might_fault();
- if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
+ if (unlikely(!access_ok(to, n)))
return n;
return __clear_user(to, n);
@@ -165,59 +92,35 @@ extern long __user_bad(void);
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
-#define get_user(x, ptr) \
- __get_user_check((x), (ptr), sizeof(*(ptr)))
-
-#define __get_user_check(x, ptr, size) \
-({ \
- unsigned long __gu_val = 0; \
- const typeof(*(ptr)) __user *__gu_addr = (ptr); \
- int __gu_err = 0; \
- \
- if (access_ok(VERIFY_READ, __gu_addr, size)) { \
- switch (size) { \
- case 1: \
- __get_user_asm("lbu", __gu_addr, __gu_val, \
- __gu_err); \
- break; \
- case 2: \
- __get_user_asm("lhu", __gu_addr, __gu_val, \
- __gu_err); \
- break; \
- case 4: \
- __get_user_asm("lw", __gu_addr, __gu_val, \
- __gu_err); \
- break; \
- default: \
- __gu_err = __user_bad(); \
- break; \
- } \
- } else { \
- __gu_err = -EFAULT; \
- } \
- x = (__force typeof(*(ptr)))__gu_val; \
- __gu_err; \
+#define get_user(x, ptr) ({ \
+ const typeof(*(ptr)) __user *__gu_ptr = (ptr); \
+ access_ok(__gu_ptr, sizeof(*__gu_ptr)) ? \
+ __get_user(x, __gu_ptr) : -EFAULT; \
})
#define __get_user(x, ptr) \
({ \
- unsigned long __gu_val = 0; \
- /*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \
long __gu_err; \
switch (sizeof(*(ptr))) { \
case 1: \
- __get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
+ __get_user_asm("lbu", (ptr), x, __gu_err); \
break; \
case 2: \
- __get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
+ __get_user_asm("lhu", (ptr), x, __gu_err); \
break; \
case 4: \
- __get_user_asm("lw", (ptr), __gu_val, __gu_err); \
+ __get_user_asm("lw", (ptr), x, __gu_err); \
break; \
+ case 8: { \
+ __u64 __x = 0; \
+ __gu_err = raw_copy_from_user(&__x, ptr, 8) ? \
+ -EFAULT : 0; \
+ (x) = (typeof(x))(typeof((x) - (x)))__x; \
+ break; \
+ } \
default: \
/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
} \
- x = (__force __typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
@@ -286,7 +189,7 @@ extern long __user_bad(void);
typeof(*(ptr)) __user *__pu_addr = (ptr); \
int __pu_err = 0; \
\
- if (access_ok(VERIFY_WRITE, __pu_addr, size)) { \
+ if (access_ok(__pu_addr, size)) { \
switch (size) { \
case 1: \
__put_user_asm("sb", __pu_addr, __pu_val, \
@@ -353,28 +256,14 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
/*
* Copy a null terminated string from userspace.
*/
-extern int __strncpy_user(char *to, const char __user *from, int len);
-
-static inline long
-strncpy_from_user(char *dst, const char __user *src, long count)
-{
- if (!access_ok(VERIFY_READ, src, 1))
- return -EFAULT;
- return __strncpy_user(dst, src, count);
-}
+__must_check long strncpy_from_user(char *dst, const char __user *src,
+ long count);
/*
* Return the size of a string (including the ending 0)
*
* Return 0 on exception, a value greater than N if too long
*/
-extern int __strnlen_user(const char __user *sstr, int len);
-
-static inline long strnlen_user(const char __user *src, long n)
-{
- if (!access_ok(VERIFY_READ, src, 1))
- return 0;
- return __strnlen_user(src, n);
-}
+__must_check long strnlen_user(const char __user *sstr, long len);
#endif /* _ASM_MICROBLAZE_UACCESS_H */
generated by cgit (git 2.34.1) at 2025-12-26 09:28:30 +0000