[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-powerpc / uaccess.h

#ifndef _ARCH_POWERPC_UACCESS_H
#define _ARCH_POWERPC_UACCESS_H

#ifdef __KERNEL__
#ifndef __ASSEMBLY__

#include <linux/sched.h>
#include <linux/errno.h>
#include <asm/processor.h>
#include <asm/page.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.
 *
 * The fs/ds values are now the highest legal address in the "segment".
 * This simplifies the checking in the routines below.
 */

#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })

#define KERNEL_DS	MAKE_MM_SEG(~0UL)
#ifdef __powerpc64__
/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
#define USER_DS		MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
#else
#define USER_DS		MAKE_MM_SEG(TASK_SIZE - 1)
#endif

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current->thread.fs)
#define set_fs(val)	(current->thread.fs = (val))

#define segment_eq(a, b)	((a).seg == (b).seg)

#ifdef __powerpc64__
/*
 * This check is sufficient because there is a large enough
 * gap between user addresses and the kernel addresses
 */
#define __access_ok(addr, size, segment)	\
	(((addr) <= (segment).seg) && ((size) <= (segment).seg))

#else

#define __access_ok(addr, size, segment)	\
	(((addr) <= (segment).seg) &&		\
	 (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))

#endif

#define access_ok(type, addr, size)		\
	(__chk_user_ptr(addr),			\
	 __access_ok((__force unsigned long)(addr), (size), get_fs()))

/*
 * 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;
	unsigned long fixup;
};

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 *
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 *
 * As we use the same address space for kernel and user data on the
 * PowerPC, we can just do these as direct assignments.  (Of course, the
 * exception handling means that it's no longer "just"...)
 *
 * The "user64" versions of the user access functions are versions that
 * allow access of 64-bit data. The "get_user" functions do not
 * properly handle 64-bit data because the value gets down cast to a long.
 * The "put_user" functions already handle 64-bit data properly but we add
 * "user64" versions for completeness
 */
#define get_user(x, ptr) \
	__get_user_check((x), (ptr), sizeof(*(ptr)))
#define put_user(x, ptr) \
	__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

#define __get_user(x, ptr) \
	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#ifndef __powerpc64__
#define __get_user64(x, ptr) \
	__get_user64_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user64(x, ptr) __put_user(x, ptr)
#endif

#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user

extern long __put_user_bad(void);

/*
 * We don't tell gcc that we are accessing memory, but this is OK
 * because we do not write to any memory gcc knows about, so there
 * are no aliasing issues.
 */
#define __put_user_asm(x, addr, err, op)			\
	__asm__ __volatile__(					\
		"1:	" op " %1,0(%2)	# put_user\n"		\
		"2:\n"						\
		".section .fixup,\"ax\"\n"			\
		"3:	li %0,%3\n"				\
		"	b 2b\n"					\
		".previous\n"					\
		".section __ex_table,\"a\"\n"			\
		"	.balign %5\n"				\
			PPC_LONG "1b,3b\n"			\
		".previous"					\
		: "=r" (err)					\
		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err),\
		  "i"(sizeof(unsigned long)))

#ifdef __powerpc64__
#define __put_user_asm2(x, ptr, retval)				\
	  __put_user_asm(x, ptr, retval, "std")
#else /* __powerpc64__ */
#define __put_user_asm2(x, addr, err)				\
	__asm__ __volatile__(					\
		"1:	stw %1,0(%2)\n"				\
		"2:	stw %1+1,4(%2)\n"			\
		"3:\n"						\
		".section .fixup,\"ax\"\n"			\
		"4:	li %0,%3\n"				\
		"	b 3b\n"					\
		".previous\n"					\
		".section __ex_table,\"a\"\n"			\
		"	.balign %5\n"				\
			PPC_LONG "1b,4b\n"			\
			PPC_LONG "2b,4b\n"			\
		".previous"					\
		: "=r" (err)					\
		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err),\
		  "i"(sizeof(unsigned long)))
#endif /* __powerpc64__ */

#define __put_user_size(x, ptr, size, retval)			\
do {								\
	retval = 0;						\
	switch (size) {						\
	  case 1: __put_user_asm(x, ptr, retval, "stb"); break;	\
	  case 2: __put_user_asm(x, ptr, retval, "sth"); break;	\
	  case 4: __put_user_asm(x, ptr, retval, "stw"); break;	\
	  case 8: __put_user_asm2(x, ptr, retval); break;	\
	  default: __put_user_bad();				\
	}							\
} while (0)

#define __put_user_nocheck(x, ptr, size)			\
({								\
	long __pu_err;						\
	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
	if (!is_kernel_addr((unsigned long)__pu_addr))		\
		might_sleep();					\
	__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);			\
	might_sleep();							\
	if (access_ok(VERIFY_WRITE, __pu_addr, size))			\
		__put_user_size((x), __pu_addr, (size), __pu_err);	\
	__pu_err;							\
})

extern long __get_user_bad(void);

#define __get_user_asm(x, addr, err, op)		\
	__asm__ __volatile__(				\
		"1:	"op" %1,0(%2)	# get_user\n"	\
		"2:\n"					\
		".section .fixup,\"ax\"\n"		\
		"3:	li %0,%3\n"			\
		"	li %1,0\n"			\
		"	b 2b\n"				\
		".previous\n"				\
		".section __ex_table,\"a\"\n"		\
		"	.balign %5\n"			\
			PPC_LONG "1b,3b\n"		\
		".previous"				\
		: "=r" (err), "=r" (x)			\
		: "b" (addr), "i" (-EFAULT), "0" (err),	\
		  "i"(sizeof(unsigned long)))

#ifdef __powerpc64__
#define __get_user_asm2(x, addr, err)			\
	__get_user_asm(x, addr, err, "ld")
#else /* __powerpc64__ */
#define __get_user_asm2(x, addr, err)			\
	__asm__ __volatile__(				\
		"1:	lwz %1,0(%2)\n"			\
		"2:	lwz %1+1,4(%2)\n"		\
		"3:\n"					\
		".section .fixup,\"ax\"\n"		\
		"4:	li %0,%3\n"			\
		"	li %1,0\n"			\
		"	li %1+1,0\n"			\
		"	b 3b\n"				\
		".previous\n"				\
		".section __ex_table,\"a\"\n"		\
		"	.balign %5\n"			\
			PPC_LONG "1b,4b\n"		\
			PPC_LONG "2b,4b\n"		\
		".previous"				\
		: "=r" (err), "=&r" (x)			\
		: "b" (addr), "i" (-EFAULT), "0" (err),	\
		  "i"(sizeof(unsigned long)))
#endif /* __powerpc64__ */

#define __get_user_size(x, ptr, size, retval)			\
do {								\
	retval = 0;						\
	__chk_user_ptr(ptr);					\
	if (size > sizeof(x))					\
		(x) = __get_user_bad();				\
	switch (size) {						\
	case 1: __get_user_asm(x, ptr, retval, "lbz"); break;	\
	case 2: __get_user_asm(x, ptr, retval, "lhz"); break;	\
	case 4: __get_user_asm(x, ptr, retval, "lwz"); break;	\
	case 8: __get_user_asm2(x, ptr, retval);  break;	\
	default: (x) = __get_user_bad();			\
	}							\
} while (0)

#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);					\
	if (!is_kernel_addr((unsigned long)__gu_addr))		\
		might_sleep();					\
	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
	(x) = (__typeof__(*(ptr)))__gu_val;			\
	__gu_err;						\
})

#ifndef __powerpc64__
#define __get_user64_nocheck(x, ptr, size)			\
({								\
	long __gu_err;						\
	long long __gu_val;					\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
	__chk_user_ptr(ptr);					\
	if (!is_kernel_addr((unsigned long)__gu_addr))		\
		might_sleep();					\
	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
	(x) = (__typeof__(*(ptr)))__gu_val;			\
	__gu_err;						\
})
#endif /* __powerpc64__ */

#define __get_user_check(x, ptr, size)					\
({									\
	long __gu_err = -EFAULT;					\
	unsigned long  __gu_val = 0;					\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);		\
	might_sleep();							\
	if (access_ok(VERIFY_READ, __gu_addr, (size)))			\
		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
	(x) = (__typeof__(*(ptr)))__gu_val;				\
	__gu_err;							\
})

/* more complex routines */

extern unsigned long __copy_tofrom_user(void __user *to,
		const void __user *from, unsigned long size);

#ifndef __powerpc64__

static inline unsigned long copy_from_user(void *to,
		const void __user *from, unsigned long n)
{
	unsigned long over;

	if (access_ok(VERIFY_READ, from, n))
		return __copy_tofrom_user((__force void __user *)to, from, n);
	if ((unsigned long)from < TASK_SIZE) {
		over = (unsigned long)from + n - TASK_SIZE;
		return __copy_tofrom_user((__force void __user *)to, from,
				n - over) + over;
	}
	return n;
}

static inline unsigned long copy_to_user(void __user *to,
		const void *from, unsigned long n)
{
	unsigned long over;

	if (access_ok(VERIFY_WRITE, to, n))
		return __copy_tofrom_user(to, (__force void __user *)from, n);
	if ((unsigned long)to < TASK_SIZE) {
		over = (unsigned long)to + n - TASK_SIZE;
		return __copy_tofrom_user(to, (__force void __user *)from,
				n - over) + over;
	}
	return n;
}

#else /* __powerpc64__ */

#define __copy_in_user(to, from, size) \
	__copy_tofrom_user((to), (from), (size))

extern unsigned long copy_from_user(void *to, const void __user *from,
				    unsigned long n);
extern unsigned long copy_to_user(void __user *to, const void *from,
				  unsigned long n);
extern unsigned long copy_in_user(void __user *to, const void __user *from,
				  unsigned long n);

#endif /* __powerpc64__ */

static inline unsigned long __copy_from_user_inatomic(void *to,
		const void __user *from, unsigned long n)
{
	if (__builtin_constant_p(n) && (n <= 8)) {
		unsigned long ret;

		switch (n) {
		case 1:
			__get_user_size(*(u8 *)to, from, 1, ret);
			break;
		case 2:
			__get_user_size(*(u16 *)to, from, 2, ret);
			break;
		case 4:
			__get_user_size(*(u32 *)to, from, 4, ret);
			break;
		case 8:
			__get_user_size(*(u64 *)to, from, 8, ret);
			break;
		}
		if (ret == 0)
			return 0;
	}
	return __copy_tofrom_user((__force void __user *)to, from, n);
}

static inline unsigned long __copy_to_user_inatomic(void __user *to,
		const void *from, unsigned long n)
{
	if (__builtin_constant_p(n) && (n <= 8)) {
		unsigned long ret;

		switch (n) {
		case 1:
			__put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret);
			break;
		case 2:
			__put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret);
			break;
		case 4:
			__put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret);
			break;
		case 8:
			__put_user_size(*(u64 *)from, (u64 __user *)to, 8, ret);
			break;
		}
		if (ret == 0)
			return 0;
	}
	return __copy_tofrom_user(to, (__force const void __user *)from, n);
}

static inline unsigned long __copy_from_user(void *to,
		const void __user *from, unsigned long size)
{
	might_sleep();
	return __copy_from_user_inatomic(to, from, size);
}

static inline unsigned long __copy_to_user(void __user *to,
		const void *from, unsigned long size)
{
	might_sleep();
	return __copy_to_user_inatomic(to, from, size);
}

extern unsigned long __clear_user(void __user *addr, unsigned long size);

static inline unsigned long clear_user(void __user *addr, unsigned long size)
{
	might_sleep();
	if (likely(access_ok(VERIFY_WRITE, addr, size)))
		return __clear_user(addr, size);
	if ((unsigned long)addr < TASK_SIZE) {
		unsigned long over = (unsigned long)addr + size - TASK_SIZE;
		return __clear_user(addr, size - over) + over;
	}
	return size;
}

extern int __strncpy_from_user(char *dst, const char __user *src, long count);

static inline long strncpy_from_user(char *dst, const char __user *src,
		long count)
{
	might_sleep();
	if (likely(access_ok(VERIFY_READ, src, 1)))
		return __strncpy_from_user(dst, src, count);
	return -EFAULT;
}

/*
 * Return the size of a string (including the ending 0)
 *
 * Return 0 for error
 */
extern int __strnlen_user(const char __user *str, long len, unsigned long top);

/*
 * Returns the length of the string at str (including the null byte),
 * or 0 if we hit a page we can't access,
 * or something > len if we didn't find a null byte.
 *
 * The `top' parameter to __strnlen_user is to make sure that
 * we can never overflow from the user area into kernel space.
 */
static inline int strnlen_user(const char __user *str, long len)
{
	unsigned long top = current->thread.fs.seg;

	if ((unsigned long)str > top)
		return 0;
	return __strnlen_user(str, len, top);
}

#define strlen_user(str)	strnlen_user((str), 0x7ffffffe)

#endif  /* __ASSEMBLY__ */
#endif /* __KERNEL__ */

#endif	/* _ARCH_POWERPC_UACCESS_H */
Commit	Line	Data
2df5e8bc SR	1	#ifndef _ARCH_POWERPC_UACCESS_H
	2	#define _ARCH_POWERPC_UACCESS_H
	3
	4	#ifdef __KERNEL__
	5	#ifndef __ASSEMBLY__
	6
	7	#include <linux/sched.h>
	8	#include <linux/errno.h>
	9	#include <asm/processor.h>
6bfd93c3	10	#include <asm/page.h>
2df5e8bc SR	11
	12	#define VERIFY_READ 0
	13	#define VERIFY_WRITE 1
	14
	15	/*
	16	* The fs value determines whether argument validity checking should be
	17	* performed or not. If get_fs() == USER_DS, checking is performed, with
	18	* get_fs() == KERNEL_DS, checking is bypassed.
	19	*
	20	* For historical reasons, these macros are grossly misnamed.
	21	*
	22	* The fs/ds values are now the highest legal address in the "segment".
	23	* This simplifies the checking in the routines below.
	24	*/
	25
	26	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	27
5015b494	28	#define KERNEL_DS MAKE_MM_SEG(~0UL)
2df5e8bc	29	#ifdef __powerpc64__
5015b494 SR	30	/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
5015b494 SR	31	#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
2df5e8bc	32	#else
2df5e8bc SR	33	#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
	34	#endif
	35
	36	#define get_ds() (KERNEL_DS)
	37	#define get_fs() (current->thread.fs)
	38	#define set_fs(val) (current->thread.fs = (val))
	39
	40	#define segment_eq(a, b) ((a).seg == (b).seg)
	41
	42	#ifdef __powerpc64__
	43	/*
5015b494 SR	44	* This check is sufficient because there is a large enough
5015b494 SR	45	* gap between user addresses and the kernel addresses
2df5e8bc SR	46	*/
2df5e8bc SR	47	#define __access_ok(addr, size, segment) \
5015b494	48	(((addr) <= (segment).seg) && ((size) <= (segment).seg))
2df5e8bc SR	49
	50	#else
	51
	52	#define __access_ok(addr, size, segment) \
	53	(((addr) <= (segment).seg) && \
	54	(((size) == 0) \|\| (((size) - 1) <= ((segment).seg - (addr)))))
	55
	56	#endif
	57
	58	#define access_ok(type, addr, size) \
	59	(__chk_user_ptr(addr), \
	60	__access_ok((__force unsigned long)(addr), (size), get_fs()))
	61
	62	/*
	63	* The exception table consists of pairs of addresses: the first is the
	64	* address of an instruction that is allowed to fault, and the second is
	65	* the address at which the program should continue. No registers are
	66	* modified, so it is entirely up to the continuation code to figure out
	67	* what to do.
	68	*
	69	* All the routines below use bits of fixup code that are out of line
	70	* with the main instruction path. This means when everything is well,
	71	* we don't even have to jump over them. Further, they do not intrude
	72	* on our cache or tlb entries.
	73	*/
	74
	75	struct exception_table_entry {
	76	unsigned long insn;
	77	unsigned long fixup;
	78	};
	79
	80	/*
	81	* These are the main single-value transfer routines. They automatically
	82	* use the right size if we just have the right pointer type.
	83	*
	84	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	85	* and yet we don't want to do any pointers, because that is too much
	86	* of a performance impact. Thus we have a few rather ugly macros here,
	87	* and hide all the ugliness from the user.
	88	*
	89	* The "__xxx" versions of the user access functions are versions that
	90	* do not verify the address space, that must have been done previously
	91	* with a separate "access_ok()" call (this is used when we do multiple
	92	* accesses to the same area of user memory).
	93	*
	94	* As we use the same address space for kernel and user data on the
	95	* PowerPC, we can just do these as direct assignments. (Of course, the
	96	* exception handling means that it's no longer "just"...)
	97	*
	98	* The "user64" versions of the user access functions are versions that
	99	* allow access of 64-bit data. The "get_user" functions do not
	100	* properly handle 64-bit data because the value gets down cast to a long.
	101	* The "put_user" functions already handle 64-bit data properly but we add
	102	* "user64" versions for completeness
	103	*/
	104	#define get_user(x, ptr) \
	105	__get_user_check((x), (ptr), sizeof(*(ptr)))
	106	#define put_user(x, ptr) \
	107	__put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	108
	109	#define __get_user(x, ptr) \
	110	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	111	#define __put_user(x, ptr) \
	112	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
113	#ifndef __powerpc64__
114	#define __get_user64(x, ptr) \
115	__get_user64_nocheck((x), (ptr), sizeof(*(ptr)))
116	#define __put_user64(x, ptr) __put_user(x, ptr)
117	#endif
118
2df5e8bc SR	119	#define __get_user_unaligned __get_user
2df5e8bc SR	120	#define __put_user_unaligned __put_user
2df5e8bc SR	121
	122	extern long __put_user_bad(void);
	123
2df5e8bc SR	124	/*
	125	* We don't tell gcc that we are accessing memory, but this is OK
	126	* because we do not write to any memory gcc knows about, so there
	127	* are no aliasing issues.
	128	*/
	129	#define __put_user_asm(x, addr, err, op) \
	130	__asm__ __volatile__( \
	131	"1: " op " %1,0(%2) # put_user\n" \
	132	"2:\n" \
	133	".section .fixup,\"ax\"\n" \
	134	"3: li %0,%3\n" \
	135	" b 2b\n" \
	136	".previous\n" \
	137	".section __ex_table,\"a\"\n" \
3ddfbcf1 DG	138	" .balign %5\n" \
3ddfbcf1 DG	139	PPC_LONG "1b,3b\n" \
2df5e8bc SR	140	".previous" \
2df5e8bc SR	141	: "=r" (err) \
3ddfbcf1 DG	142	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err),\
3ddfbcf1 DG	143	"i"(sizeof(unsigned long)))
2df5e8bc	144
5015b494 SR	145	#ifdef __powerpc64__
	146	#define __put_user_asm2(x, ptr, retval) \
	147	__put_user_asm(x, ptr, retval, "std")
	148	#else /* __powerpc64__ */
2df5e8bc SR	149	#define __put_user_asm2(x, addr, err) \
	150	__asm__ __volatile__( \
	151	"1: stw %1,0(%2)\n" \
	152	"2: stw %1+1,4(%2)\n" \
	153	"3:\n" \
	154	".section .fixup,\"ax\"\n" \
	155	"4: li %0,%3\n" \
	156	" b 3b\n" \
	157	".previous\n" \
	158	".section __ex_table,\"a\"\n" \
3ddfbcf1 DG	159	" .balign %5\n" \
	160	PPC_LONG "1b,4b\n" \
	161	PPC_LONG "2b,4b\n" \
2df5e8bc SR	162	".previous" \
2df5e8bc SR	163	: "=r" (err) \
3ddfbcf1 DG	164	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err),\
3ddfbcf1 DG	165	"i"(sizeof(unsigned long)))
2df5e8bc SR	166	#endif /* __powerpc64__ */
	167
	168	#define __put_user_size(x, ptr, size, retval) \
	169	do { \
	170	retval = 0; \
	171	switch (size) { \
	172	case 1: __put_user_asm(x, ptr, retval, "stb"); break; \
	173	case 2: __put_user_asm(x, ptr, retval, "sth"); break; \
	174	case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
	175	case 8: __put_user_asm2(x, ptr, retval); break; \
	176	default: __put_user_bad(); \
	177	} \
	178	} while (0)
	179
	180	#define __put_user_nocheck(x, ptr, size) \
	181	({ \
	182	long __pu_err; \
6bfd93c3 PM	183	__typeof__((ptr)) __user __pu_addr = (ptr); \
	184	if (!is_kernel_addr((unsigned long)__pu_addr)) \
	185	might_sleep(); \
2df5e8bc	186	__chk_user_ptr(ptr); \
6bfd93c3	187	__put_user_size((x), __pu_addr, (size), __pu_err); \
2df5e8bc SR	188	__pu_err; \
	189	})
	190
	191	#define __put_user_check(x, ptr, size) \
	192	({ \
	193	long __pu_err = -EFAULT; \
	194	__typeof__((ptr)) __user __pu_addr = (ptr); \
	195	might_sleep(); \
	196	if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
	197	__put_user_size((x), __pu_addr, (size), __pu_err); \
	198	__pu_err; \
	199	})
	200
	201	extern long __get_user_bad(void);
	202
	203	#define __get_user_asm(x, addr, err, op) \
	204	__asm__ __volatile__( \
5015b494	205	"1: "op" %1,0(%2) # get_user\n" \
2df5e8bc SR	206	"2:\n" \
	207	".section .fixup,\"ax\"\n" \
	208	"3: li %0,%3\n" \
	209	" li %1,0\n" \
	210	" b 2b\n" \
	211	".previous\n" \
	212	".section __ex_table,\"a\"\n" \
3ddfbcf1 DG	213	" .balign %5\n" \
3ddfbcf1 DG	214	PPC_LONG "1b,3b\n" \
2df5e8bc SR	215	".previous" \
2df5e8bc SR	216	: "=r" (err), "=r" (x) \
3ddfbcf1 DG	217	: "b" (addr), "i" (-EFAULT), "0" (err), \
3ddfbcf1 DG	218	"i"(sizeof(unsigned long)))
2df5e8bc	219
5015b494 SR	220	#ifdef __powerpc64__
	221	#define __get_user_asm2(x, addr, err) \
	222	__get_user_asm(x, addr, err, "ld")
	223	#else /* __powerpc64__ */
	224	#define __get_user_asm2(x, addr, err) \
2df5e8bc SR	225	__asm__ __volatile__( \
	226	"1: lwz %1,0(%2)\n" \
	227	"2: lwz %1+1,4(%2)\n" \
	228	"3:\n" \
	229	".section .fixup,\"ax\"\n" \
	230	"4: li %0,%3\n" \
	231	" li %1,0\n" \
	232	" li %1+1,0\n" \
	233	" b 3b\n" \
	234	".previous\n" \
	235	".section __ex_table,\"a\"\n" \
3ddfbcf1 DG	236	" .balign %5\n" \
	237	PPC_LONG "1b,4b\n" \
	238	PPC_LONG "2b,4b\n" \
2df5e8bc SR	239	".previous" \
2df5e8bc SR	240	: "=r" (err), "=&r" (x) \
3ddfbcf1 DG	241	: "b" (addr), "i" (-EFAULT), "0" (err), \
3ddfbcf1 DG	242	"i"(sizeof(unsigned long)))
2df5e8bc SR	243	#endif /* __powerpc64__ */
	244
	245	#define __get_user_size(x, ptr, size, retval) \
	246	do { \
	247	retval = 0; \
	248	__chk_user_ptr(ptr); \
5015b494 SR	249	if (size > sizeof(x)) \
5015b494 SR	250	(x) = __get_user_bad(); \
2df5e8bc SR	251	switch (size) { \
	252	case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
	253	case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
	254	case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \
	255	case 8: __get_user_asm2(x, ptr, retval); break; \
	256	default: (x) = __get_user_bad(); \
	257	} \
	258	} while (0)
	259
	260	#define __get_user_nocheck(x, ptr, size) \
	261	({ \
	262	long __gu_err; \
	263	unsigned long __gu_val; \
6bfd93c3	264	const __typeof__((ptr)) __user __gu_addr = (ptr); \
2df5e8bc	265	__chk_user_ptr(ptr); \
6bfd93c3 PM	266	if (!is_kernel_addr((unsigned long)__gu_addr)) \
	267	might_sleep(); \
	268	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
2df5e8bc SR	269	(x) = (__typeof__(*(ptr)))__gu_val; \
	270	__gu_err; \
	271	})
	272
	273	#ifndef __powerpc64__
	274	#define __get_user64_nocheck(x, ptr, size) \
	275	({ \
	276	long __gu_err; \
	277	long long __gu_val; \
6bfd93c3	278	const __typeof__((ptr)) __user __gu_addr = (ptr); \
2df5e8bc	279	__chk_user_ptr(ptr); \
6bfd93c3 PM	280	if (!is_kernel_addr((unsigned long)__gu_addr)) \
	281	might_sleep(); \
	282	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
2df5e8bc SR	283	(x) = (__typeof__(*(ptr)))__gu_val; \
	284	__gu_err; \
	285	})
	286	#endif /* __powerpc64__ */
	287
	288	#define __get_user_check(x, ptr, size) \
	289	({ \
	290	long __gu_err = -EFAULT; \
	291	unsigned long __gu_val = 0; \
	292	const __typeof__((ptr)) __user __gu_addr = (ptr); \
5015b494	293	might_sleep(); \
2df5e8bc SR	294	if (access_ok(VERIFY_READ, __gu_addr, (size))) \
	295	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
	296	(x) = (__typeof__(*(ptr)))__gu_val; \
	297	__gu_err; \
	298	})
	299
	300	/* more complex routines */
	301
	302	extern unsigned long __copy_tofrom_user(void __user *to,
	303	const void __user *from, unsigned long size);
	304
	305	#ifndef __powerpc64__
5015b494	306
4cfbdfff	307	static inline unsigned long copy_from_user(void *to,
5015b494	308	const void __user *from, unsigned long n)
2df5e8bc SR	309	{
	310	unsigned long over;
	311
	312	if (access_ok(VERIFY_READ, from, n))
	313	return __copy_tofrom_user((__force void __user *)to, from, n);
	314	if ((unsigned long)from < TASK_SIZE) {
	315	over = (unsigned long)from + n - TASK_SIZE;
	316	return __copy_tofrom_user((__force void __user *)to, from,
	317	n - over) + over;
	318	}
	319	return n;
	320	}
	321
4cfbdfff	322	static inline unsigned long copy_to_user(void __user *to,
5015b494	323	const void *from, unsigned long n)
2df5e8bc SR	324	{
	325	unsigned long over;
	326
	327	if (access_ok(VERIFY_WRITE, to, n))
	328	return __copy_tofrom_user(to, (__force void __user *)from, n);
	329	if ((unsigned long)to < TASK_SIZE) {
	330	over = (unsigned long)to + n - TASK_SIZE;
	331	return __copy_tofrom_user(to, (__force void __user *)from,
	332	n - over) + over;
	333	}
	334	return n;
	335	}
	336
	337	#else /* __powerpc64__ */
	338
5015b494 SR	339	#define __copy_in_user(to, from, size) \
	340	__copy_tofrom_user((to), (from), (size))
	341
	342	extern unsigned long copy_from_user(void to, const void __user from,
	343	unsigned long n);
	344	extern unsigned long copy_to_user(void __user to, const void from,
	345	unsigned long n);
	346	extern unsigned long copy_in_user(void __user to, const void __user from,
	347	unsigned long n);
	348
48fe4871 SR	349	#endif /* __powerpc64__ */
48fe4871 SR	350
5015b494 SR	351	static inline unsigned long __copy_from_user_inatomic(void *to,
5015b494 SR	352	const void __user *from, unsigned long n)
2df5e8bc SR	353	{
	354	if (__builtin_constant_p(n) && (n <= 8)) {
	355	unsigned long ret;
	356
	357	switch (n) {
	358	case 1:
	359	__get_user_size((u8 )to, from, 1, ret);
	360	break;
	361	case 2:
	362	__get_user_size((u16 )to, from, 2, ret);
	363	break;
	364	case 4:
	365	__get_user_size((u32 )to, from, 4, ret);
	366	break;
	367	case 8:
	368	__get_user_size((u64 )to, from, 8, ret);
	369	break;
	370	}
48fe4871 SR	371	if (ret == 0)
48fe4871 SR	372	return 0;
2df5e8bc	373	}
48fe4871	374	return __copy_tofrom_user((__force void __user *)to, from, n);
2df5e8bc SR	375	}
2df5e8bc SR	376
5015b494 SR	377	static inline unsigned long __copy_to_user_inatomic(void __user *to,
5015b494 SR	378	const void *from, unsigned long n)
2df5e8bc SR	379	{
	380	if (__builtin_constant_p(n) && (n <= 8)) {
	381	unsigned long ret;
	382
	383	switch (n) {
	384	case 1:
	385	__put_user_size((u8 )from, (u8 __user *)to, 1, ret);
	386	break;
	387	case 2:
	388	__put_user_size((u16 )from, (u16 __user *)to, 2, ret);
	389	break;
	390	case 4:
	391	__put_user_size((u32 )from, (u32 __user *)to, 4, ret);
	392	break;
	393	case 8:
	394	__put_user_size((u64 )from, (u64 __user *)to, 8, ret);
	395	break;
	396	}
48fe4871 SR	397	if (ret == 0)
48fe4871 SR	398	return 0;
2df5e8bc	399	}
48fe4871	400	return __copy_tofrom_user(to, (__force const void __user *)from, n);
2df5e8bc SR	401	}
2df5e8bc SR	402
5015b494 SR	403	static inline unsigned long __copy_from_user(void *to,
5015b494 SR	404	const void __user *from, unsigned long size)
2df5e8bc SR	405	{
2df5e8bc SR	406	might_sleep();
2df5e8bc	407	return __copy_from_user_inatomic(to, from, size);
2df5e8bc SR	408	}
2df5e8bc SR	409
5015b494 SR	410	static inline unsigned long __copy_to_user(void __user *to,
5015b494 SR	411	const void *from, unsigned long size)
2df5e8bc SR	412	{
2df5e8bc SR	413	might_sleep();
2df5e8bc	414	return __copy_to_user_inatomic(to, from, size);
2df5e8bc SR	415	}
2df5e8bc SR	416
2df5e8bc SR	417	extern unsigned long __clear_user(void __user *addr, unsigned long size);
	418
	419	static inline unsigned long clear_user(void __user *addr, unsigned long size)
	420	{
	421	might_sleep();
	422	if (likely(access_ok(VERIFY_WRITE, addr, size)))
	423	return __clear_user(addr, size);
2df5e8bc SR	424	if ((unsigned long)addr < TASK_SIZE) {
	425	unsigned long over = (unsigned long)addr + size - TASK_SIZE;
	426	return __clear_user(addr, size - over) + over;
	427	}
2df5e8bc SR	428	return size;
	429	}
	430
	431	extern int __strncpy_from_user(char dst, const char __user src, long count);
	432
	433	static inline long strncpy_from_user(char dst, const char __user src,
	434	long count)
	435	{
	436	might_sleep();
	437	if (likely(access_ok(VERIFY_READ, src, 1)))
	438	return __strncpy_from_user(dst, src, count);
	439	return -EFAULT;
	440	}
	441
	442	/*
	443	* Return the size of a string (including the ending 0)
	444	*
	445	* Return 0 for error
	446	*/
2df5e8bc	447	extern int __strnlen_user(const char __user *str, long len, unsigned long top);
2df5e8bc SR	448
	449	/*
	450	* Returns the length of the string at str (including the null byte),
	451	* or 0 if we hit a page we can't access,
	452	* or something > len if we didn't find a null byte.
	453	*
	454	* The `top' parameter to __strnlen_user is to make sure that
	455	* we can never overflow from the user area into kernel space.
	456	*/
	457	static inline int strnlen_user(const char __user *str, long len)
	458	{
2df5e8bc SR	459	unsigned long top = current->thread.fs.seg;
	460
	461	if ((unsigned long)str > top)
	462	return 0;
	463	return __strnlen_user(str, len, top);
2df5e8bc SR	464	}
	465
	466	#define strlen_user(str) strnlen_user((str), 0x7ffffffe)
	467
	468	#endif /* __ASSEMBLY__ */
	469	#endif /* __KERNEL__ */
	470
	471	#endif /* _ARCH_POWERPC_UACCESS_H */