311 строки
8.2 KiB
C
311 строки
8.2 KiB
C
/* 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.
|
|
*/
|
|
|
|
#ifndef _ASM_MICROBLAZE_UACCESS_H
|
|
#define _ASM_MICROBLAZE_UACCESS_H
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <asm/mmu.h>
|
|
#include <asm/page.h>
|
|
#include <linux/pgtable.h>
|
|
#include <asm/extable.h>
|
|
#include <linux/string.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) })
|
|
|
|
# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
|
|
# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
|
|
|
|
# define get_fs() (current_thread_info()->addr_limit)
|
|
# define set_fs(val) (current_thread_info()->addr_limit = (val))
|
|
# define user_addr_max() get_fs().seg
|
|
|
|
# define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
|
|
|
|
static inline int access_ok(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 at 0x%08x (size 0x%x), seg 0x%08x\n",
|
|
(__force u32)addr, (u32)size,
|
|
(u32)get_fs().seg);
|
|
return 0;
|
|
}
|
|
ok:
|
|
pr_devel("ACCESS OK at 0x%08x (size 0x%x), seg 0x%08x\n",
|
|
(__force u32)addr, (u32)size,
|
|
(u32)get_fs().seg);
|
|
return 1;
|
|
}
|
|
|
|
# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
|
|
# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
|
|
|
|
extern unsigned long __copy_tofrom_user(void __user *to,
|
|
const void __user *from, unsigned long size);
|
|
|
|
/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
|
|
static inline unsigned long __must_check __clear_user(void __user *to,
|
|
unsigned long n)
|
|
{
|
|
/* normal memset with two words to __ex_table */
|
|
__asm__ __volatile__ ( \
|
|
"1: sb r0, %1, r0;" \
|
|
" addik %0, %0, -1;" \
|
|
" bneid %0, 1b;" \
|
|
" addik %1, %1, 1;" \
|
|
"2: " \
|
|
__EX_TABLE_SECTION \
|
|
".word 1b,2b;" \
|
|
".previous;" \
|
|
: "=r"(n), "=r"(to) \
|
|
: "0"(n), "1"(to)
|
|
);
|
|
return n;
|
|
}
|
|
|
|
static inline unsigned long __must_check clear_user(void __user *to,
|
|
unsigned long n)
|
|
{
|
|
might_fault();
|
|
if (unlikely(!access_ok(to, n)))
|
|
return n;
|
|
|
|
return __clear_user(to, n);
|
|
}
|
|
|
|
/* put_user and get_user macros */
|
|
extern long __user_bad(void);
|
|
|
|
#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
|
|
({ \
|
|
__asm__ __volatile__ ( \
|
|
"1:" insn " %1, %2, r0;" \
|
|
" addk %0, r0, r0;" \
|
|
"2: " \
|
|
__FIXUP_SECTION \
|
|
"3: brid 2b;" \
|
|
" addik %0, r0, %3;" \
|
|
".previous;" \
|
|
__EX_TABLE_SECTION \
|
|
".word 1b,3b;" \
|
|
".previous;" \
|
|
: "=&r"(__gu_err), "=r"(__gu_val) \
|
|
: "r"(__gu_ptr), "i"(-EFAULT) \
|
|
); \
|
|
})
|
|
|
|
/**
|
|
* get_user: - Get a simple variable from user space.
|
|
* @x: Variable to store result.
|
|
* @ptr: Source address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple variable from user space to kernel
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and the result of
|
|
* dereferencing @ptr must be assignable to @x without a cast.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
* On error, the variable @x is set to zero.
|
|
*/
|
|
#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; \
|
|
long __gu_err; \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: \
|
|
__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
case 8: \
|
|
__gu_err = __copy_from_user(&__gu_val, ptr, 8); \
|
|
if (__gu_err) \
|
|
__gu_err = -EFAULT; \
|
|
break; \
|
|
default: \
|
|
/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
|
|
} \
|
|
x = (__force __typeof__(*(ptr))) __gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
|
|
#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
|
|
({ \
|
|
__asm__ __volatile__ ( \
|
|
"1:" insn " %1, %2, r0;" \
|
|
" addk %0, r0, r0;" \
|
|
"2: " \
|
|
__FIXUP_SECTION \
|
|
"3: brid 2b;" \
|
|
" addik %0, r0, %3;" \
|
|
".previous;" \
|
|
__EX_TABLE_SECTION \
|
|
".word 1b,3b;" \
|
|
".previous;" \
|
|
: "=&r"(__gu_err) \
|
|
: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
|
|
); \
|
|
})
|
|
|
|
#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
|
|
({ \
|
|
__asm__ __volatile__ (" lwi %0, %1, 0;" \
|
|
"1: swi %0, %2, 0;" \
|
|
" lwi %0, %1, 4;" \
|
|
"2: swi %0, %2, 4;" \
|
|
" addk %0, r0, r0;" \
|
|
"3: " \
|
|
__FIXUP_SECTION \
|
|
"4: brid 3b;" \
|
|
" addik %0, r0, %3;" \
|
|
".previous;" \
|
|
__EX_TABLE_SECTION \
|
|
".word 1b,4b,2b,4b;" \
|
|
".previous;" \
|
|
: "=&r"(__gu_err) \
|
|
: "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
|
|
); \
|
|
})
|
|
|
|
/**
|
|
* put_user: - Write a simple value into user space.
|
|
* @x: Value to copy to user space.
|
|
* @ptr: Destination address, in user space.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* This macro copies a single simple value from kernel space to user
|
|
* space. It supports simple types like char and int, but not larger
|
|
* data types like structures or arrays.
|
|
*
|
|
* @ptr must have pointer-to-simple-variable type, and @x must be assignable
|
|
* to the result of dereferencing @ptr.
|
|
*
|
|
* Returns zero on success, or -EFAULT on error.
|
|
*/
|
|
#define put_user(x, ptr) \
|
|
__put_user_check((x), (ptr), sizeof(*(ptr)))
|
|
|
|
#define __put_user_check(x, ptr, size) \
|
|
({ \
|
|
typeof(*(ptr)) volatile __pu_val = x; \
|
|
typeof(*(ptr)) __user *__pu_addr = (ptr); \
|
|
int __pu_err = 0; \
|
|
\
|
|
if (access_ok(__pu_addr, size)) { \
|
|
switch (size) { \
|
|
case 1: \
|
|
__put_user_asm("sb", __pu_addr, __pu_val, \
|
|
__pu_err); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm("sh", __pu_addr, __pu_val, \
|
|
__pu_err); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm("sw", __pu_addr, __pu_val, \
|
|
__pu_err); \
|
|
break; \
|
|
case 8: \
|
|
__put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
|
|
break; \
|
|
default: \
|
|
__pu_err = __user_bad(); \
|
|
break; \
|
|
} \
|
|
} else { \
|
|
__pu_err = -EFAULT; \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user(x, ptr) \
|
|
({ \
|
|
__typeof__(*(ptr)) volatile __gu_val = (x); \
|
|
long __gu_err = 0; \
|
|
switch (sizeof(__gu_val)) { \
|
|
case 1: \
|
|
__put_user_asm("sb", (ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm("sh", (ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm("sw", (ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
case 8: \
|
|
__put_user_asm_8((ptr), __gu_val, __gu_err); \
|
|
break; \
|
|
default: \
|
|
/*__gu_err = -EINVAL;*/ __gu_err = __user_bad(); \
|
|
} \
|
|
__gu_err; \
|
|
})
|
|
|
|
static inline unsigned long
|
|
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
return __copy_tofrom_user((__force void __user *)to, from, n);
|
|
}
|
|
|
|
static inline unsigned long
|
|
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
return __copy_tofrom_user(to, (__force const void __user *)from, n);
|
|
}
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
|
|
/*
|
|
* Copy a null terminated string from userspace.
|
|
*/
|
|
__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
|
|
*/
|
|
__must_check long strnlen_user(const char __user *sstr, long len);
|
|
|
|
#endif /* _ASM_MICROBLAZE_UACCESS_H */
|