[mirror_ubuntu-artful-kernel.git] / arch / powerpc / include / asm / uaccess.h

#ifndef _ARCH_POWERPC_UACCESS_H
#define _ARCH_POWERPC_UACCESS_H

#include <asm/asm-compat.h>
#include <asm/ppc_asm.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/extable.h>

/*
 * 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)

#define user_addr_max()	(get_fs().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()))

/*
 * 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"...)
 *
 */
#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)))

#define __get_user_inatomic(x, ptr) \
	__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
#define __put_user_inatomic(x, ptr) \
	__put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

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"					\
		EX_TABLE(1b, 3b)				\
		: "=r" (err)					\
		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))

#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"					\
		EX_TABLE(1b, 4b)				\
		EX_TABLE(2b, 4b)				\
		: "=r" (err)					\
		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
#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_fault();					\
	__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_fault();							\
	if (access_ok(VERIFY_WRITE, __pu_addr, size))			\
		__put_user_size((x), __pu_addr, (size), __pu_err);	\
	__pu_err;							\
})

#define __put_user_nosleep(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;						\
})


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"				\
		EX_TABLE(1b, 3b)			\
		: "=r" (err), "=r" (x)			\
		: "b" (addr), "i" (-EFAULT), "0" (err))

#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"				\
		EX_TABLE(1b, 4b)			\
		EX_TABLE(2b, 4b)			\
		: "=r" (err), "=&r" (x)			\
		: "b" (addr), "i" (-EFAULT), "0" (err))
#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_fault();					\
	__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)) __user *__gu_addr = (ptr);		\
	might_fault();							\
	if (access_ok(VERIFY_READ, __gu_addr, (size)))			\
		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;				\
	__gu_err;							\
})

#define __get_user_nosleep(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) = (__force __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);

#ifdef __powerpc64__
static inline unsigned long
raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
	return __copy_tofrom_user(to, from, n);
}
#endif /* __powerpc64__ */

static inline unsigned long raw_copy_from_user(void *to,
		const void __user *from, unsigned long n)
{
	if (__builtin_constant_p(n) && (n <= 8)) {
		unsigned long ret = 1;

		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 raw_copy_to_user(void __user *to,
		const void *from, unsigned long n)
{
	if (__builtin_constant_p(n) && (n <= 8)) {
		unsigned long ret = 1;

		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);
}

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

static inline unsigned long clear_user(void __user *addr, unsigned long size)
{
	might_fault();
	if (likely(access_ok(VERIFY_WRITE, addr, size)))
		return __clear_user(addr, size);
	return size;
}

extern long strncpy_from_user(char *dst, const char __user *src, long count);
extern __must_check long strnlen_user(const char __user *str, long n);

#endif	/* _ARCH_POWERPC_UACCESS_H */
Commit	Line	Data
2df5e8bc SR	1	#ifndef _ARCH_POWERPC_UACCESS_H
	2	#define _ARCH_POWERPC_UACCESS_H
	3
551c3c04	4	#include <asm/asm-compat.h>
24bfa6a9	5	#include <asm/ppc_asm.h>
2df5e8bc	6	#include <asm/processor.h>
6bfd93c3	7	#include <asm/page.h>
527b5bae	8	#include <asm/extable.h>
2df5e8bc	9
2df5e8bc SR	10	/*
	11	* The fs value determines whether argument validity checking should be
	12	* performed or not. If get_fs() == USER_DS, checking is performed, with
	13	* get_fs() == KERNEL_DS, checking is bypassed.
	14	*
	15	* For historical reasons, these macros are grossly misnamed.
	16	*
	17	* The fs/ds values are now the highest legal address in the "segment".
	18	* This simplifies the checking in the routines below.
	19	*/
	20
	21	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	22
5015b494	23	#define KERNEL_DS MAKE_MM_SEG(~0UL)
2df5e8bc	24	#ifdef __powerpc64__
5015b494 SR	25	/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
5015b494 SR	26	#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
2df5e8bc	27	#else
2df5e8bc SR	28	#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
	29	#endif
	30
	31	#define get_ds() (KERNEL_DS)
	32	#define get_fs() (current->thread.fs)
	33	#define set_fs(val) (current->thread.fs = (val))
	34
	35	#define segment_eq(a, b) ((a).seg == (b).seg)
	36
1629372c PM	37	#define user_addr_max() (get_fs().seg)
1629372c PM	38
2df5e8bc SR	39	#ifdef __powerpc64__
2df5e8bc SR	40	/*
5015b494 SR	41	* This check is sufficient because there is a large enough
5015b494 SR	42	* gap between user addresses and the kernel addresses
2df5e8bc SR	43	*/
2df5e8bc SR	44	#define __access_ok(addr, size, segment) \
5015b494	45	(((addr) <= (segment).seg) && ((size) <= (segment).seg))
2df5e8bc SR	46
	47	#else
	48
	49	#define __access_ok(addr, size, segment) \
	50	(((addr) <= (segment).seg) && \
	51	(((size) == 0) \|\| (((size) - 1) <= ((segment).seg - (addr)))))
	52
	53	#endif
	54
	55	#define access_ok(type, addr, size) \
	56	(__chk_user_ptr(addr), \
	57	__access_ok((__force unsigned long)(addr), (size), get_fs()))
	58
2df5e8bc SR	59	/*
	60	* These are the main single-value transfer routines. They automatically
	61	* use the right size if we just have the right pointer type.
	62	*
	63	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	64	* and yet we don't want to do any pointers, because that is too much
	65	* of a performance impact. Thus we have a few rather ugly macros here,
	66	* and hide all the ugliness from the user.
	67	*
	68	* The "__xxx" versions of the user access functions are versions that
	69	* do not verify the address space, that must have been done previously
	70	* with a separate "access_ok()" call (this is used when we do multiple
	71	* accesses to the same area of user memory).
	72	*
	73	* As we use the same address space for kernel and user data on the
	74	* PowerPC, we can just do these as direct assignments. (Of course, the
	75	* exception handling means that it's no longer "just"...)
	76	*
2df5e8bc SR	77	*/
	78	#define get_user(x, ptr) \
	79	__get_user_check((x), (ptr), sizeof(*(ptr)))
	80	#define put_user(x, ptr) \
	81	__put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	82
	83	#define __get_user(x, ptr) \
	84	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	85	#define __put_user(x, ptr) \
	86	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
e68c825b	87
e68c825b BH	88	#define __get_user_inatomic(x, ptr) \
	89	__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
	90	#define __put_user_inatomic(x, ptr) \
	91	__put_user_nosleep((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	92
2df5e8bc SR	93	extern long __put_user_bad(void);
2df5e8bc SR	94
2df5e8bc SR	95	/*
	96	* We don't tell gcc that we are accessing memory, but this is OK
	97	* because we do not write to any memory gcc knows about, so there
	98	* are no aliasing issues.
	99	*/
	100	#define __put_user_asm(x, addr, err, op) \
	101	__asm__ __volatile__( \
	102	"1: " op " %1,0(%2) # put_user\n" \
	103	"2:\n" \
	104	".section .fixup,\"ax\"\n" \
	105	"3: li %0,%3\n" \
	106	" b 2b\n" \
	107	".previous\n" \
24bfa6a9	108	EX_TABLE(1b, 3b) \
2df5e8bc	109	: "=r" (err) \
551c3c04	110	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc	111
5015b494 SR	112	#ifdef __powerpc64__
	113	#define __put_user_asm2(x, ptr, retval) \
	114	__put_user_asm(x, ptr, retval, "std")
	115	#else /* __powerpc64__ */
2df5e8bc SR	116	#define __put_user_asm2(x, addr, err) \
	117	__asm__ __volatile__( \
	118	"1: stw %1,0(%2)\n" \
	119	"2: stw %1+1,4(%2)\n" \
	120	"3:\n" \
	121	".section .fixup,\"ax\"\n" \
	122	"4: li %0,%3\n" \
	123	" b 3b\n" \
	124	".previous\n" \
24bfa6a9 NP	125	EX_TABLE(1b, 4b) \
24bfa6a9 NP	126	EX_TABLE(2b, 4b) \
2df5e8bc	127	: "=r" (err) \
551c3c04	128	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc SR	129	#endif /* __powerpc64__ */
	130
	131	#define __put_user_size(x, ptr, size, retval) \
	132	do { \
	133	retval = 0; \
	134	switch (size) { \
	135	case 1: __put_user_asm(x, ptr, retval, "stb"); break; \
	136	case 2: __put_user_asm(x, ptr, retval, "sth"); break; \
	137	case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
	138	case 8: __put_user_asm2(x, ptr, retval); break; \
	139	default: __put_user_bad(); \
	140	} \
	141	} while (0)
	142
	143	#define __put_user_nocheck(x, ptr, size) \
	144	({ \
	145	long __pu_err; \
6bfd93c3 PM	146	__typeof__((ptr)) __user __pu_addr = (ptr); \
6bfd93c3 PM	147	if (!is_kernel_addr((unsigned long)__pu_addr)) \
1af1717d	148	might_fault(); \
2df5e8bc	149	__chk_user_ptr(ptr); \
6bfd93c3	150	__put_user_size((x), __pu_addr, (size), __pu_err); \
2df5e8bc SR	151	__pu_err; \
	152	})
	153
	154	#define __put_user_check(x, ptr, size) \
	155	({ \
	156	long __pu_err = -EFAULT; \
	157	__typeof__((ptr)) __user __pu_addr = (ptr); \
1af1717d	158	might_fault(); \
2df5e8bc SR	159	if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
	160	__put_user_size((x), __pu_addr, (size), __pu_err); \
	161	__pu_err; \
	162	})
	163
e68c825b BH	164	#define __put_user_nosleep(x, ptr, size) \
	165	({ \
	166	long __pu_err; \
	167	__typeof__((ptr)) __user __pu_addr = (ptr); \
	168	__chk_user_ptr(ptr); \
	169	__put_user_size((x), __pu_addr, (size), __pu_err); \
	170	__pu_err; \
	171	})
	172
	173
2df5e8bc SR	174	extern long __get_user_bad(void);
	175
	176	#define __get_user_asm(x, addr, err, op) \
	177	__asm__ __volatile__( \
5015b494	178	"1: "op" %1,0(%2) # get_user\n" \
2df5e8bc SR	179	"2:\n" \
	180	".section .fixup,\"ax\"\n" \
	181	"3: li %0,%3\n" \
	182	" li %1,0\n" \
	183	" b 2b\n" \
	184	".previous\n" \
24bfa6a9	185	EX_TABLE(1b, 3b) \
2df5e8bc	186	: "=r" (err), "=r" (x) \
551c3c04	187	: "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc	188
5015b494 SR	189	#ifdef __powerpc64__
	190	#define __get_user_asm2(x, addr, err) \
	191	__get_user_asm(x, addr, err, "ld")
	192	#else /* __powerpc64__ */
	193	#define __get_user_asm2(x, addr, err) \
2df5e8bc SR	194	__asm__ __volatile__( \
	195	"1: lwz %1,0(%2)\n" \
	196	"2: lwz %1+1,4(%2)\n" \
	197	"3:\n" \
	198	".section .fixup,\"ax\"\n" \
	199	"4: li %0,%3\n" \
	200	" li %1,0\n" \
	201	" li %1+1,0\n" \
	202	" b 3b\n" \
	203	".previous\n" \
24bfa6a9 NP	204	EX_TABLE(1b, 4b) \
24bfa6a9 NP	205	EX_TABLE(2b, 4b) \
2df5e8bc	206	: "=r" (err), "=&r" (x) \
551c3c04	207	: "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc SR	208	#endif /* __powerpc64__ */
	209
	210	#define __get_user_size(x, ptr, size, retval) \
	211	do { \
	212	retval = 0; \
	213	__chk_user_ptr(ptr); \
5015b494 SR	214	if (size > sizeof(x)) \
5015b494 SR	215	(x) = __get_user_bad(); \
2df5e8bc SR	216	switch (size) { \
	217	case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
	218	case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
	219	case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \
	220	case 8: __get_user_asm2(x, ptr, retval); break; \
	221	default: (x) = __get_user_bad(); \
	222	} \
	223	} while (0)
	224
	225	#define __get_user_nocheck(x, ptr, size) \
	226	({ \
	227	long __gu_err; \
	228	unsigned long __gu_val; \
d466f6c5	229	const __typeof__((ptr)) __user __gu_addr = (ptr); \
2df5e8bc	230	__chk_user_ptr(ptr); \
6bfd93c3	231	if (!is_kernel_addr((unsigned long)__gu_addr)) \
1af1717d	232	might_fault(); \
6bfd93c3	233	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
2df5e8bc SR	234	(x) = (__typeof__(*(ptr)))__gu_val; \
	235	__gu_err; \
	236	})
	237
2df5e8bc SR	238	#define __get_user_check(x, ptr, size) \
	239	({ \
	240	long __gu_err = -EFAULT; \
	241	unsigned long __gu_val = 0; \
f84ed59a	242	const __typeof__((ptr)) __user __gu_addr = (ptr); \
1af1717d	243	might_fault(); \
2df5e8bc SR	244	if (access_ok(VERIFY_READ, __gu_addr, (size))) \
2df5e8bc SR	245	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
505e4283	246	(x) = (__force __typeof__(*(ptr)))__gu_val; \
2df5e8bc SR	247	__gu_err; \
	248	})
	249
e68c825b BH	250	#define __get_user_nosleep(x, ptr, size) \
	251	({ \
	252	long __gu_err; \
	253	unsigned long __gu_val; \
f2ca8090	254	const __typeof__((ptr)) __user __gu_addr = (ptr); \
e68c825b BH	255	__chk_user_ptr(ptr); \
e68c825b BH	256	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
505e4283	257	(x) = (__force __typeof__(*(ptr)))__gu_val; \
e68c825b BH	258	__gu_err; \
	259	})
	260
	261
2df5e8bc SR	262	/* more complex routines */
	263
	264	extern unsigned long __copy_tofrom_user(void __user *to,
	265	const void __user *from, unsigned long size);
	266
d6bd8194	267	#ifdef __powerpc64__
3448890c AV	268	static inline unsigned long
	269	raw_copy_in_user(void __user to, const void __user from, unsigned long n)
	270	{
	271	return __copy_tofrom_user(to, from, n);
	272	}
48fe4871 SR	273	#endif /* __powerpc64__ */
48fe4871 SR	274
3448890c	275	static inline unsigned long raw_copy_from_user(void *to,
5015b494	276	const void __user *from, unsigned long n)
2df5e8bc SR	277	{
2df5e8bc SR	278	if (__builtin_constant_p(n) && (n <= 8)) {
9c8387af	279	unsigned long ret = 1;
2df5e8bc SR	280
	281	switch (n) {
	282	case 1:
	283	__get_user_size((u8 )to, from, 1, ret);
	284	break;
	285	case 2:
	286	__get_user_size((u16 )to, from, 2, ret);
	287	break;
	288	case 4:
	289	__get_user_size((u32 )to, from, 4, ret);
	290	break;
	291	case 8:
	292	__get_user_size((u64 )to, from, 8, ret);
	293	break;
	294	}
48fe4871 SR	295	if (ret == 0)
48fe4871 SR	296	return 0;
2df5e8bc	297	}
1d3c1324	298
48fe4871	299	return __copy_tofrom_user((__force void __user *)to, from, n);
2df5e8bc SR	300	}
2df5e8bc SR	301
3448890c	302	static inline unsigned long raw_copy_to_user(void __user *to,
5015b494	303	const void *from, unsigned long n)
2df5e8bc SR	304	{
2df5e8bc SR	305	if (__builtin_constant_p(n) && (n <= 8)) {
9c8387af	306	unsigned long ret = 1;
2df5e8bc SR	307
	308	switch (n) {
	309	case 1:
	310	__put_user_size((u8 )from, (u8 __user *)to, 1, ret);
	311	break;
	312	case 2:
	313	__put_user_size((u16 )from, (u16 __user *)to, 2, ret);
	314	break;
	315	case 4:
	316	__put_user_size((u32 )from, (u32 __user *)to, 4, ret);
	317	break;
	318	case 8:
	319	__put_user_size((u64 )from, (u64 __user *)to, 8, ret);
	320	break;
	321	}
48fe4871 SR	322	if (ret == 0)
48fe4871 SR	323	return 0;
2df5e8bc	324	}
81409e9e	325
48fe4871	326	return __copy_tofrom_user(to, (__force const void __user *)from, n);
2df5e8bc SR	327	}
2df5e8bc SR	328
2df5e8bc SR	329	extern unsigned long __clear_user(void __user *addr, unsigned long size);
	330
	331	static inline unsigned long clear_user(void __user *addr, unsigned long size)
	332	{
1af1717d	333	might_fault();
2df5e8bc SR	334	if (likely(access_ok(VERIFY_WRITE, addr, size)))
2df5e8bc SR	335	return __clear_user(addr, size);
2df5e8bc SR	336	return size;
	337	}
	338
1629372c	339	extern long strncpy_from_user(char dst, const char __user src, long count);
1629372c	340	extern __must_check long strnlen_user(const char __user *str, long n);
2df5e8bc	341
2df5e8bc	342	#endif /* _ARCH_POWERPC_UACCESS_H */