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sh: Initial consolidation of the _32/_64 uaccess split.

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This consolidates everything but the bare assembly routines, which we
will sync up in a follow-up patch.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2008-06-03 20:05:39 +09:00
parent 31f6a11fe7
commit 42fd3b142d
3 changed files with 270 additions and 416 deletions
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222
include/asm-sh/uaccess.h
View File

@@ -1,12 +1,171 @@
#ifndef __ASM_SH_UACCESS_H #ifndef __ASM_SH_UACCESS_H
#define __ASM_SH_UACCESS_H #define __ASM_SH_UACCESS_H
#include <linux/errno.h>
#include <linux/sched.h>
#include <asm/segment.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define __addr_ok(addr) \
((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
/*
* __access_ok: Check if address with size is OK or not.
*
* Uhhuh, this needs 33-bit arithmetic. We have a carry..
*
* sum := addr + size; carry? --> flag = true;
* if (sum >= addr_limit) flag = true;
*/
#define __access_ok(addr, size) \
(__addr_ok((addr) + (size)))
#define access_ok(type, addr, size) \
(__chk_user_ptr(addr), \
__access_ok((unsigned long __force)(addr), (size)))
/*
* Uh, these should become the main single-value transfer routines ...
* They automatically use the right size if we just have the right
* pointer type ...
*
* As SuperH uses the same address space for kernel and user data, we
* can just do these as direct assignments.
*
* Careful to not
* (a) re-use the arguments for side effects (sizeof is ok)
* (b) require any knowledge of processes at this stage
*/
#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
/*
* The "__xxx" versions do not do address space checking, useful when
* doing multiple accesses to the same area (the user has to do the
* checks by hand with "access_ok()")
*/
#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
#define __get_user_nocheck(x,ptr,size) \
({ \
long __gu_err; \
unsigned long __gu_val; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
__chk_user_ptr(ptr); \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_check(x,ptr,size) \
({ \
long __gu_err = -EFAULT; \
unsigned long __gu_val = 0; \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \
if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __put_user_nocheck(x,ptr,size) \
({ \
long __pu_err; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
__chk_user_ptr(ptr); \
__put_user_size((x), __pu_addr, (size), __pu_err); \
__pu_err; \
})
#define __put_user_check(x,ptr,size) \
({ \
long __pu_err = -EFAULT; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
__put_user_size((x), __pu_addr, (size), \
__pu_err); \
__pu_err; \
})
#ifdef CONFIG_SUPERH32 #ifdef CONFIG_SUPERH32
# include "uaccess_32.h" # include "uaccess_32.h"
#else #else
# include "uaccess_64.h" # include "uaccess_64.h"
#endif #endif
/* Generic arbitrary sized copy. */
/* Return the number of bytes NOT copied */
__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
static __always_inline unsigned long
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
return __copy_user(to, (__force void *)from, n);
}
static __always_inline unsigned long __must_check
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
return __copy_user((__force void *)to, from, n);
}
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
/*
* Clear the area and return remaining number of bytes
* (on failure. Usually it's 0.)
*/
__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
#define clear_user(addr,n) \
({ \
void __user * __cl_addr = (addr); \
unsigned long __cl_size = (n); \
\
if (__cl_size && access_ok(VERIFY_WRITE, \
((unsigned long)(__cl_addr)), __cl_size)) \
__cl_size = __clear_user(__cl_addr, __cl_size); \
\
__cl_size; \
})
/**
* 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.
*/
#define strncpy_from_user(dest,src,count) \
({ \
unsigned long __sfu_src = (unsigned long)(src); \
int __sfu_count = (int)(count); \
long __sfu_res = -EFAULT; \
\
if (__access_ok(__sfu_src, __sfu_count)) \
__sfu_res = __strncpy_from_user((unsigned long)(dest), \
__sfu_src, __sfu_count); \
\
__sfu_res; \
})
static inline unsigned long static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n) copy_from_user(void *to, const void __user *from, unsigned long n)
{ {
@@ -31,4 +190,67 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
return __copy_size; return __copy_size;
} }
/**
* strnlen_user: - Get the size of a string in user space.
* @s: The string to measure.
* @n: The maximum valid length
*
* Context: User context only. This function may sleep.
*
* 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.
*/
static inline long strnlen_user(const char __user *s, long n)
{
if (!__addr_ok(s))
return 0;
else
return __strnlen_user(s, n);
}
/**
* strlen_user: - Get the size of a string in user space.
* @str: The string to measure.
*
* Context: User context only. This function may sleep.
*
* 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 there is a limit on the length of a valid string, you may wish to
* consider using strnlen_user() instead.
*/
#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry {
unsigned long insn, fixup;
};
#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
#define ARCH_HAS_SEARCH_EXTABLE
#endif
int fixup_exception(struct pt_regs *regs);
/* Returns 0 if exception not found and fixup.unit otherwise. */
unsigned long search_exception_table(unsigned long addr);
const struct exception_table_entry *search_exception_tables(unsigned long addr);
#endif /* __ASM_SH_UACCESS_H */ #endif /* __ASM_SH_UACCESS_H */

277
include/asm-sh/uaccess_32.h
View File

@@ -12,56 +12,6 @@
#ifndef __ASM_SH_UACCESS_32_H #ifndef __ASM_SH_UACCESS_32_H
#define __ASM_SH_UACCESS_32_H #define __ASM_SH_UACCESS_32_H
#include <linux/errno.h>
#include <linux/sched.h>
#include <asm/segment.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define __addr_ok(addr) \
((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
/*
* __access_ok: Check if address with size is OK or not.
*
* Uhhuh, this needs 33-bit arithmetic. We have a carry..
*
* sum := addr + size; carry? --> flag = true;
* if (sum >= addr_limit) flag = true;
*/
#define __access_ok(addr, size) \
(__addr_ok((addr) + (size)))
#define access_ok(type, addr, size) \
(__chk_user_ptr(addr), \
__access_ok((unsigned long __force)(addr), (size)))
/*
* Uh, these should become the main single-value transfer routines ...
* They automatically use the right size if we just have the right
* pointer type ...
*
* As SuperH uses the same address space for kernel and user data, we
* can just do these as direct assignments.
*
* Careful to not
* (a) re-use the arguments for side effects (sizeof is ok)
* (b) require any knowledge of processes at this stage
*/
#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
/*
* The "__xxx" versions do not do address space checking, useful when
* doing multiple accesses to the same area (the user has to do the
* checks by hand with "access_ok()")
*/
#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
#define __get_user_size(x,ptr,size,retval) \ #define __get_user_size(x,ptr,size,retval) \
do { \ do { \
retval = 0; \ retval = 0; \
@@ -81,28 +31,7 @@ do { \
} \ } \
} while (0) } while (0)
#define __get_user_nocheck(x,ptr,size) \ #ifdef CONFIG_MMU
({ \
long __gu_err; \
unsigned long __gu_val; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
__chk_user_ptr(ptr); \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_check(x,ptr,size) \
({ \
long __gu_err = -EFAULT; \
unsigned long __gu_val = 0; \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \
if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_asm(x, addr, err, insn) \ #define __get_user_asm(x, addr, err, insn) \
({ \ ({ \
__asm__ __volatile__( \ __asm__ __volatile__( \
@@ -123,6 +52,16 @@ __asm__ __volatile__( \
".previous" \ ".previous" \
:"=&r" (err), "=&r" (x) \ :"=&r" (err), "=&r" (x) \
:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); }) :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
#else
#define __get_user_asm(x, addr, err, insn) \
do { \
__asm__ __volatile__ ( \
"mov." insn " %1, %0\n\t" \
: "=&r" (x) \
: "m" (__m(addr)) \
); \
} while (0)
#endif /* CONFIG_MMU */
extern void __get_user_unknown(void); extern void __get_user_unknown(void);
@@ -147,45 +86,41 @@ do { \
} \ } \
} while (0) } while (0)
#define __put_user_nocheck(x,ptr,size) \ #ifdef CONFIG_MMU
({ \ #define __put_user_asm(x, addr, err, insn) \
long __pu_err; \ do { \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \ __asm__ __volatile__ ( \
__chk_user_ptr(ptr); \ "1:\n\t" \
__put_user_size((x), __pu_addr, (size), __pu_err); \ "mov." insn " %1, %2\n\t" \
__pu_err; \ "2:\n" \
}) ".section .fixup,\"ax\"\n" \
"3:\n\t" \
#define __put_user_check(x,ptr,size) \ "mov.l 4f, %0\n\t" \
({ \ "jmp @%0\n\t" \
long __pu_err = -EFAULT; \ " mov %3, %0\n\t" \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \ ".balign 4\n" \
if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ "4: .long 2b\n\t" \
__put_user_size((x), __pu_addr, (size), \ ".previous\n" \
__pu_err); \ ".section __ex_table,\"a\"\n\t" \
__pu_err; \ ".long 1b, 3b\n\t" \
}) ".previous" \
: "=&r" (err) \
#define __put_user_asm(x, addr, err, insn) \ : "r" (x), "m" (__m(addr)), "i" (-EFAULT), \
({ \ "0" (err) \
__asm__ __volatile__( \ : "memory" \
"1:\n\t" \ ); \
"mov." insn " %1, %2\n\t" \ } while (0)
"2:\n" \ #else
".section .fixup,\"ax\"\n" \ #define __put_user_asm(x, addr, err, insn) \
"3:\n\t" \ do { \
"mov.l 4f, %0\n\t" \ __asm__ __volatile__ ( \
"jmp @%0\n\t" \ "mov." insn " %0, %1\n\t" \
" mov %3, %0\n\t" \ : /* no outputs */ \
".balign 4\n" \ : "r" (x), "m" (__m(addr)) \
"4: .long 2b\n\t" \ : "memory" \
".previous\n" \ ); \
".section __ex_table,\"a\"\n\t" \ } while (0)
".long 1b, 3b\n\t" \ #endif /* CONFIG_MMU */
".previous" \
:"=&r" (err) \
:"r" (x), "m" (__m(addr)), "i" (-EFAULT), "0" (err) \
:"memory"); })
#if defined(CONFIG_CPU_LITTLE_ENDIAN) #if defined(CONFIG_CPU_LITTLE_ENDIAN)
#define __put_user_u64(val,addr,retval) \ #define __put_user_u64(val,addr,retval) \
@@ -235,40 +170,7 @@ __asm__ __volatile__( \
extern void __put_user_unknown(void); extern void __put_user_unknown(void);
/* Generic arbitrary sized copy. */ static inline int
/* Return the number of bytes NOT copied */
__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
static __always_inline unsigned long
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
return __copy_user(to, (__force void *)from, n);
}
static __always_inline unsigned long __must_check
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
return __copy_user((__force void *)to, from, n);
}
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
/*
* Clear the area and return remaining number of bytes
* (on failure. Usually it's 0.)
*/
extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
#define clear_user(addr,n) ({ \
void * __cl_addr = (addr); \
unsigned long __cl_size = (n); \
if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
__cl_size = __clear_user(__cl_addr, __cl_size); \
__cl_size; })
static __inline__ int
__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count) __strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
{ {
__kernel_size_t res; __kernel_size_t res;
@@ -307,37 +209,11 @@ __strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __coun
return res; return res;
} }
/**
* 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.
*/
#define strncpy_from_user(dest,src,count) ({ \
unsigned long __sfu_src = (unsigned long) (src); \
int __sfu_count = (int) (count); \
long __sfu_res = -EFAULT; \
if(__access_ok(__sfu_src, __sfu_count)) { \
__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
} __sfu_res; })
/* /*
* Return the size of a string (including the ending 0 even when we have * Return the size of a string (including the ending 0 even when we have
* exceeded the maximum string length). * exceeded the maximum string length).
*/ */
static __inline__ long __strnlen_user(const char __user *__s, long __n) static inline long __strnlen_user(const char __user *__s, long __n)
{ {
unsigned long res; unsigned long res;
unsigned long __dummy; unsigned long __dummy;
@@ -369,61 +245,4 @@ static __inline__ long __strnlen_user(const char __user *__s, long __n)
return res; return res;
} }
/**
* strnlen_user: - Get the size of a string in user space.
* @s: The string to measure.
* @n: The maximum valid length
*
* Context: User context only. This function may sleep.
*
* 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.
*/
static __inline__ long strnlen_user(const char __user *s, long n)
{
if (!__addr_ok(s))
return 0;
else
return __strnlen_user(s, n);
}
/**
* strlen_user: - Get the size of a string in user space.
* @str: The string to measure.
*
* Context: User context only. This function may sleep.
*
* 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 there is a limit on the length of a valid string, you may wish to
* consider using strnlen_user() instead.
*/
#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
unsigned long insn, fixup;
};
extern int fixup_exception(struct pt_regs *regs);
#endif /* __ASM_SH_UACCESS_32_H */ #endif /* __ASM_SH_UACCESS_32_H */

187
include/asm-sh/uaccess_64.h
View File

@@ -20,68 +20,6 @@
* License. See the file "COPYING" in the main directory of this archive * License. See the file "COPYING" in the main directory of this archive
* for more details. * for more details.
*/ */
#include <linux/errno.h>
#include <linux/sched.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define __addr_ok(addr) ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
/*
* Uhhuh, this needs 33-bit arithmetic. We have a carry..
*
* sum := addr + size; carry? --> flag = true;
* if (sum >= addr_limit) flag = true;
*/
#define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current_thread_info()->addr_limit.seg)) ? 0 : 1)
#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
#define __access_ok(addr,size) (__range_ok(addr,size) == 0)
/*
* Uh, these should become the main single-value transfer routines ...
* They automatically use the right size if we just have the right
* pointer type ...
*
* As MIPS uses the same address space for kernel and user data, we
* can just do these as direct assignments.
*
* Careful to not
* (a) re-use the arguments for side effects (sizeof is ok)
* (b) require any knowledge of processes at this stage
*/
#define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr)))
#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
/*
* The "__xxx" versions do not do address space checking, useful when
* doing multiple accesses to the same area (the user has to do the
* checks by hand with "access_ok()")
*/
#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
/*
* The "xxx_ret" versions return constant specified in third argument, if
* something bad happens. These macros can be optimized for the
* case of just returning from the function xxx_ret is used.
*/
#define put_user_ret(x,ptr,ret) ({ \
if (put_user(x,ptr)) return ret; })
#define get_user_ret(x,ptr,ret) ({ \
if (get_user(x,ptr)) return ret; })
#define __put_user_ret(x,ptr,ret) ({ \
if (__put_user(x,ptr)) return ret; })
#define __get_user_ret(x,ptr,ret) ({ \
if (__get_user(x,ptr)) return ret; })
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))
#define __get_user_size(x,ptr,size,retval) \ #define __get_user_size(x,ptr,size,retval) \
do { \ do { \
@@ -105,26 +43,6 @@ do { \
} \ } \
} while (0) } while (0)
#define __get_user_nocheck(x,ptr,size) \
({ \
long __gu_err, __gu_val; \
__get_user_size((void *)&__gu_val, (long)(ptr), \
(size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_check(x,ptr,size) \
({ \
long __gu_addr = (long)(ptr); \
long __gu_err = -EFAULT, __gu_val; \
if (__access_ok(__gu_addr, (size))) \
__get_user_size((void *)&__gu_val, __gu_addr, \
(size), __gu_err); \
(x) = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
extern long __get_user_asm_b(void *, long); extern long __get_user_asm_b(void *, long);
extern long __get_user_asm_w(void *, long); extern long __get_user_asm_w(void *, long);
extern long __get_user_asm_l(void *, long); extern long __get_user_asm_l(void *, long);
@@ -152,115 +70,10 @@ do { \
} \ } \
} while (0) } while (0)
#define __put_user_nocheck(x,ptr,size) \
({ \
long __pu_err; \
__typeof__(*(ptr)) __pu_val = (x); \
__put_user_size((void *)&__pu_val, (long)(ptr), (size), __pu_err); \
__pu_err; \
})
#define __put_user_check(x,ptr,size) \
({ \
long __pu_err = -EFAULT; \
long __pu_addr = (long)(ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
\
if (__access_ok(__pu_addr, (size))) \
__put_user_size((void *)&__pu_val, __pu_addr, (size), __pu_err);\
__pu_err; \
})
extern long __put_user_asm_b(void *, long); extern long __put_user_asm_b(void *, long);
extern long __put_user_asm_w(void *, long); extern long __put_user_asm_w(void *, long);
extern long __put_user_asm_l(void *, long); extern long __put_user_asm_l(void *, long);
extern long __put_user_asm_q(void *, long); extern long __put_user_asm_q(void *, long);
extern void __put_user_unknown(void); extern void __put_user_unknown(void);
/* Generic arbitrary sized copy. */
/* Return the number of bytes NOT copied */
/* XXX: should be such that: 4byte and the rest. */
extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n);
#define copy_to_user_ret(to,from,n,retval) ({ \
if (copy_to_user(to,from,n)) \
return retval; \
})
#define __copy_to_user(to,from,n) \
__copy_user((void *)(to), \
(void *)(from), n)
#define __copy_to_user_ret(to,from,n,retval) ({ \
if (__copy_to_user(to,from,n)) \
return retval; \
})
#define copy_from_user_ret(to,from,n,retval) ({ \
if (copy_from_user(to,from,n)) \
return retval; \
})
#define __copy_from_user(to,from,n) \
__copy_user((void *)(to), \
(void *)(from), n)
#define __copy_from_user_ret(to,from,n,retval) ({ \
if (__copy_from_user(to,from,n)) \
return retval; \
})
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
/* XXX: Not sure it works well..
should be such that: 4byte clear and the rest. */
extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
#define clear_user(addr,n) ({ \
void * __cl_addr = (addr); \
unsigned long __cl_size = (n); \
if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
__cl_size = __clear_user(__cl_addr, __cl_size); \
__cl_size; })
extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count);
#define strncpy_from_user(dest,src,count) ({ \
unsigned long __sfu_src = (unsigned long) (src); \
int __sfu_count = (int) (count); \
long __sfu_res = -EFAULT; \
if(__access_ok(__sfu_src, __sfu_count)) { \
__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
} __sfu_res; })
#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
/*
* Return the size of a string (including the ending 0!)
*/
extern long __strnlen_user(const char *__s, long __n);
static inline long strnlen_user(const char *s, long n)
{
if (!__addr_ok(s))
return 0;
else
return __strnlen_user(s, n);
}
struct exception_table_entry
{
unsigned long insn, fixup;
};
#ifdef CONFIG_MMU
#define ARCH_HAS_SEARCH_EXTABLE
#endif
/* Returns 0 if exception not found and fixup.unit otherwise. */
extern unsigned long search_exception_table(unsigned long addr);
extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
#endif /* __ASM_SH_UACCESS_64_H */ #endif /* __ASM_SH_UACCESS_64_H */