[deliverable/linux.git] / arch / powerpc / include / asm / 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/asm-compat.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)

#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()))

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

#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"			\
			PPC_LONG_ALIGN "\n"			\
			PPC_LONG "1b,3b\n"			\
		".previous"					\
		: "=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"					\
		".section __ex_table,\"a\"\n"			\
			PPC_LONG_ALIGN "\n"			\
			PPC_LONG "1b,4b\n"			\
			PPC_LONG "2b,4b\n"			\
		".previous"					\
		: "=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"				\
		".section __ex_table,\"a\"\n"		\
			PPC_LONG_ALIGN "\n"		\
			PPC_LONG "1b,3b\n"		\
		".previous"				\
		: "=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"				\
		".section __ex_table,\"a\"\n"		\
			PPC_LONG_ALIGN "\n"		\
			PPC_LONG "1b,4b\n"		\
			PPC_LONG "2b,4b\n"		\
		".previous"				\
		: "=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;					\
	__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;					\
	__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;					\
	__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);

#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 = 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 __copy_to_user_inatomic(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);
}

static inline unsigned long __copy_from_user(void *to,
		const void __user *from, unsigned long size)
{
	might_fault();
	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_fault();
	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_fault();
	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 long strncpy_from_user(char *dst, const char __user *src, long count);
extern __must_check long strlen_user(const char __user *str);
extern __must_check long strnlen_user(const char __user *str, long n);

#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>
551c3c04	9	#include <asm/asm-compat.h>
2df5e8bc	10	#include <asm/processor.h>
6bfd93c3	11	#include <asm/page.h>
2df5e8bc SR	12
	13	#define VERIFY_READ 0
	14	#define VERIFY_WRITE 1
	15
	16	/*
	17	* The fs value determines whether argument validity checking should be
	18	* performed or not. If get_fs() == USER_DS, checking is performed, with
	19	* get_fs() == KERNEL_DS, checking is bypassed.
	20	*
	21	* For historical reasons, these macros are grossly misnamed.
	22	*
	23	* The fs/ds values are now the highest legal address in the "segment".
	24	* This simplifies the checking in the routines below.
	25	*/
	26
	27	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	28
5015b494	29	#define KERNEL_DS MAKE_MM_SEG(~0UL)
2df5e8bc	30	#ifdef __powerpc64__
5015b494 SR	31	/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
5015b494 SR	32	#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
2df5e8bc	33	#else
2df5e8bc SR	34	#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
	35	#endif
	36
	37	#define get_ds() (KERNEL_DS)
	38	#define get_fs() (current->thread.fs)
	39	#define set_fs(val) (current->thread.fs = (val))
	40
	41	#define segment_eq(a, b) ((a).seg == (b).seg)
	42
1629372c PM	43	#define user_addr_max() (get_fs().seg)
1629372c PM	44
2df5e8bc SR	45	#ifdef __powerpc64__
2df5e8bc SR	46	/*
5015b494 SR	47	* This check is sufficient because there is a large enough
5015b494 SR	48	* gap between user addresses and the kernel addresses
2df5e8bc SR	49	*/
2df5e8bc SR	50	#define __access_ok(addr, size, segment) \
5015b494	51	(((addr) <= (segment).seg) && ((size) <= (segment).seg))
2df5e8bc SR	52
	53	#else
	54
	55	#define __access_ok(addr, size, segment) \
	56	(((addr) <= (segment).seg) && \
	57	(((size) == 0) \|\| (((size) - 1) <= ((segment).seg - (addr)))))
	58
	59	#endif
	60
	61	#define access_ok(type, addr, size) \
	62	(__chk_user_ptr(addr), \
	63	__access_ok((__force unsigned long)(addr), (size), get_fs()))
	64
	65	/*
	66	* The exception table consists of pairs of addresses: the first is the
	67	* address of an instruction that is allowed to fault, and the second is
	68	* the address at which the program should continue. No registers are
	69	* modified, so it is entirely up to the continuation code to figure out
	70	* what to do.
	71	*
	72	* All the routines below use bits of fixup code that are out of line
	73	* with the main instruction path. This means when everything is well,
	74	* we don't even have to jump over them. Further, they do not intrude
	75	* on our cache or tlb entries.
	76	*/
	77
	78	struct exception_table_entry {
	79	unsigned long insn;
	80	unsigned long fixup;
	81	};
	82
	83	/*
	84	* These are the main single-value transfer routines. They automatically
	85	* use the right size if we just have the right pointer type.
	86	*
	87	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	88	* and yet we don't want to do any pointers, because that is too much
	89	* of a performance impact. Thus we have a few rather ugly macros here,
	90	* and hide all the ugliness from the user.
	91	*
	92	* The "__xxx" versions of the user access functions are versions that
	93	* do not verify the address space, that must have been done previously
	94	* with a separate "access_ok()" call (this is used when we do multiple
	95	* accesses to the same area of user memory).
	96	*
	97	* As we use the same address space for kernel and user data on the
	98	* PowerPC, we can just do these as direct assignments. (Of course, the
	99	* exception handling means that it's no longer "just"...)
	100	*
2df5e8bc SR	101	*/
	102	#define get_user(x, ptr) \
	103	__get_user_check((x), (ptr), sizeof(*(ptr)))
	104	#define put_user(x, ptr) \
	105	__put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	106
	107	#define __get_user(x, ptr) \
	108	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	109	#define __put_user(x, ptr) \
	110	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
e68c825b	111
e68c825b BH	112	#define __get_user_inatomic(x, ptr) \
	113	__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
	114	#define __put_user_inatomic(x, ptr) \
	115	__put_user_nosleep((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	116
2df5e8bc SR	117	#define __get_user_unaligned __get_user
2df5e8bc SR	118	#define __put_user_unaligned __put_user
2df5e8bc SR	119
	120	extern long __put_user_bad(void);
	121
2df5e8bc SR	122	/*
	123	* We don't tell gcc that we are accessing memory, but this is OK
	124	* because we do not write to any memory gcc knows about, so there
	125	* are no aliasing issues.
	126	*/
	127	#define __put_user_asm(x, addr, err, op) \
	128	__asm__ __volatile__( \
	129	"1: " op " %1,0(%2) # put_user\n" \
	130	"2:\n" \
	131	".section .fixup,\"ax\"\n" \
	132	"3: li %0,%3\n" \
	133	" b 2b\n" \
	134	".previous\n" \
	135	".section __ex_table,\"a\"\n" \
551c3c04	136	PPC_LONG_ALIGN "\n" \
3ddfbcf1	137	PPC_LONG "1b,3b\n" \
2df5e8bc SR	138	".previous" \
2df5e8bc SR	139	: "=r" (err) \
551c3c04	140	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc	141
5015b494 SR	142	#ifdef __powerpc64__
	143	#define __put_user_asm2(x, ptr, retval) \
	144	__put_user_asm(x, ptr, retval, "std")
	145	#else /* __powerpc64__ */
2df5e8bc SR	146	#define __put_user_asm2(x, addr, err) \
	147	__asm__ __volatile__( \
	148	"1: stw %1,0(%2)\n" \
	149	"2: stw %1+1,4(%2)\n" \
	150	"3:\n" \
	151	".section .fixup,\"ax\"\n" \
	152	"4: li %0,%3\n" \
	153	" b 3b\n" \
	154	".previous\n" \
	155	".section __ex_table,\"a\"\n" \
551c3c04	156	PPC_LONG_ALIGN "\n" \
3ddfbcf1 DG	157	PPC_LONG "1b,4b\n" \
3ddfbcf1 DG	158	PPC_LONG "2b,4b\n" \
2df5e8bc SR	159	".previous" \
2df5e8bc SR	160	: "=r" (err) \
551c3c04	161	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc SR	162	#endif /* __powerpc64__ */
	163
	164	#define __put_user_size(x, ptr, size, retval) \
	165	do { \
	166	retval = 0; \
	167	switch (size) { \
	168	case 1: __put_user_asm(x, ptr, retval, "stb"); break; \
	169	case 2: __put_user_asm(x, ptr, retval, "sth"); break; \
	170	case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
	171	case 8: __put_user_asm2(x, ptr, retval); break; \
	172	default: __put_user_bad(); \
	173	} \
	174	} while (0)
	175
	176	#define __put_user_nocheck(x, ptr, size) \
	177	({ \
	178	long __pu_err; \
6bfd93c3 PM	179	__typeof__((ptr)) __user __pu_addr = (ptr); \
6bfd93c3 PM	180	if (!is_kernel_addr((unsigned long)__pu_addr)) \
1af1717d	181	might_fault(); \
2df5e8bc	182	__chk_user_ptr(ptr); \
6bfd93c3	183	__put_user_size((x), __pu_addr, (size), __pu_err); \
2df5e8bc SR	184	__pu_err; \
	185	})
	186
	187	#define __put_user_check(x, ptr, size) \
	188	({ \
	189	long __pu_err = -EFAULT; \
	190	__typeof__((ptr)) __user __pu_addr = (ptr); \
1af1717d	191	might_fault(); \
2df5e8bc SR	192	if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
	193	__put_user_size((x), __pu_addr, (size), __pu_err); \
	194	__pu_err; \
	195	})
	196
e68c825b BH	197	#define __put_user_nosleep(x, ptr, size) \
	198	({ \
	199	long __pu_err; \
	200	__typeof__((ptr)) __user __pu_addr = (ptr); \
	201	__chk_user_ptr(ptr); \
	202	__put_user_size((x), __pu_addr, (size), __pu_err); \
	203	__pu_err; \
	204	})
	205
	206
2df5e8bc SR	207	extern long __get_user_bad(void);
	208
	209	#define __get_user_asm(x, addr, err, op) \
	210	__asm__ __volatile__( \
5015b494	211	"1: "op" %1,0(%2) # get_user\n" \
2df5e8bc SR	212	"2:\n" \
	213	".section .fixup,\"ax\"\n" \
	214	"3: li %0,%3\n" \
	215	" li %1,0\n" \
	216	" b 2b\n" \
	217	".previous\n" \
	218	".section __ex_table,\"a\"\n" \
551c3c04	219	PPC_LONG_ALIGN "\n" \
3ddfbcf1	220	PPC_LONG "1b,3b\n" \
2df5e8bc SR	221	".previous" \
2df5e8bc SR	222	: "=r" (err), "=r" (x) \
551c3c04	223	: "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc	224
5015b494 SR	225	#ifdef __powerpc64__
	226	#define __get_user_asm2(x, addr, err) \
	227	__get_user_asm(x, addr, err, "ld")
	228	#else /* __powerpc64__ */
	229	#define __get_user_asm2(x, addr, err) \
2df5e8bc SR	230	__asm__ __volatile__( \
	231	"1: lwz %1,0(%2)\n" \
	232	"2: lwz %1+1,4(%2)\n" \
	233	"3:\n" \
	234	".section .fixup,\"ax\"\n" \
	235	"4: li %0,%3\n" \
	236	" li %1,0\n" \
	237	" li %1+1,0\n" \
	238	" b 3b\n" \
	239	".previous\n" \
	240	".section __ex_table,\"a\"\n" \
551c3c04	241	PPC_LONG_ALIGN "\n" \
3ddfbcf1 DG	242	PPC_LONG "1b,4b\n" \
3ddfbcf1 DG	243	PPC_LONG "2b,4b\n" \
2df5e8bc SR	244	".previous" \
2df5e8bc SR	245	: "=r" (err), "=&r" (x) \
551c3c04	246	: "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc SR	247	#endif /* __powerpc64__ */
	248
	249	#define __get_user_size(x, ptr, size, retval) \
	250	do { \
	251	retval = 0; \
	252	__chk_user_ptr(ptr); \
5015b494 SR	253	if (size > sizeof(x)) \
5015b494 SR	254	(x) = __get_user_bad(); \
2df5e8bc SR	255	switch (size) { \
	256	case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
	257	case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
	258	case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \
	259	case 8: __get_user_asm2(x, ptr, retval); break; \
	260	default: (x) = __get_user_bad(); \
	261	} \
	262	} while (0)
	263
	264	#define __get_user_nocheck(x, ptr, size) \
	265	({ \
	266	long __gu_err; \
	267	unsigned long __gu_val; \
b91c1e3e	268	__typeof__((ptr)) __user __gu_addr = (ptr); \
2df5e8bc	269	__chk_user_ptr(ptr); \
6bfd93c3	270	if (!is_kernel_addr((unsigned long)__gu_addr)) \
1af1717d	271	might_fault(); \
6bfd93c3	272	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
2df5e8bc SR	273	(x) = (__typeof__(*(ptr)))__gu_val; \
	274	__gu_err; \
	275	})
	276
2df5e8bc SR	277	#define __get_user_check(x, ptr, size) \
	278	({ \
	279	long __gu_err = -EFAULT; \
	280	unsigned long __gu_val = 0; \
b91c1e3e	281	__typeof__((ptr)) __user __gu_addr = (ptr); \
1af1717d	282	might_fault(); \
2df5e8bc SR	283	if (access_ok(VERIFY_READ, __gu_addr, (size))) \
2df5e8bc SR	284	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
505e4283	285	(x) = (__force __typeof__(*(ptr)))__gu_val; \
2df5e8bc SR	286	__gu_err; \
	287	})
	288
e68c825b BH	289	#define __get_user_nosleep(x, ptr, size) \
	290	({ \
	291	long __gu_err; \
	292	unsigned long __gu_val; \
b91c1e3e	293	__typeof__((ptr)) __user __gu_addr = (ptr); \
e68c825b BH	294	__chk_user_ptr(ptr); \
e68c825b BH	295	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
505e4283	296	(x) = (__force __typeof__(*(ptr)))__gu_val; \
e68c825b BH	297	__gu_err; \
	298	})
	299
	300
2df5e8bc SR	301	/* more complex routines */
	302
	303	extern unsigned long __copy_tofrom_user(void __user *to,
	304	const void __user *from, unsigned long size);
	305
	306	#ifndef __powerpc64__
5015b494	307
4cfbdfff	308	static inline unsigned long copy_from_user(void *to,
5015b494	309	const void __user *from, unsigned long n)
2df5e8bc SR	310	{
	311	unsigned long over;
	312
	313	if (access_ok(VERIFY_READ, from, n))
	314	return __copy_tofrom_user((__force void __user *)to, from, n);
	315	if ((unsigned long)from < TASK_SIZE) {
	316	over = (unsigned long)from + n - TASK_SIZE;
	317	return __copy_tofrom_user((__force void __user *)to, from,
	318	n - over) + over;
	319	}
	320	return n;
	321	}
	322
4cfbdfff	323	static inline unsigned long copy_to_user(void __user *to,
5015b494	324	const void *from, unsigned long n)
2df5e8bc SR	325	{
	326	unsigned long over;
	327
	328	if (access_ok(VERIFY_WRITE, to, n))
	329	return __copy_tofrom_user(to, (__force void __user *)from, n);
	330	if ((unsigned long)to < TASK_SIZE) {
	331	over = (unsigned long)to + n - TASK_SIZE;
	332	return __copy_tofrom_user(to, (__force void __user *)from,
	333	n - over) + over;
	334	}
	335	return n;
	336	}
	337
	338	#else /* __powerpc64__ */
	339
5015b494 SR	340	#define __copy_in_user(to, from, size) \
	341	__copy_tofrom_user((to), (from), (size))
	342
	343	extern unsigned long copy_from_user(void to, const void __user from,
	344	unsigned long n);
	345	extern unsigned long copy_to_user(void __user to, const void from,
	346	unsigned long n);
	347	extern unsigned long copy_in_user(void __user to, const void __user from,
	348	unsigned long n);
	349
48fe4871 SR	350	#endif /* __powerpc64__ */
48fe4871 SR	351
5015b494 SR	352	static inline unsigned long __copy_from_user_inatomic(void *to,
5015b494 SR	353	const void __user *from, unsigned long n)
2df5e8bc SR	354	{
2df5e8bc SR	355	if (__builtin_constant_p(n) && (n <= 8)) {
9c8387af	356	unsigned long ret = 1;
2df5e8bc SR	357
	358	switch (n) {
	359	case 1:
	360	__get_user_size((u8 )to, from, 1, ret);
	361	break;
	362	case 2:
	363	__get_user_size((u16 )to, from, 2, ret);
	364	break;
	365	case 4:
	366	__get_user_size((u32 )to, from, 4, ret);
	367	break;
	368	case 8:
	369	__get_user_size((u64 )to, from, 8, ret);
	370	break;
	371	}
48fe4871 SR	372	if (ret == 0)
48fe4871 SR	373	return 0;
2df5e8bc	374	}
48fe4871	375	return __copy_tofrom_user((__force void __user *)to, from, n);
2df5e8bc SR	376	}
2df5e8bc SR	377
5015b494 SR	378	static inline unsigned long __copy_to_user_inatomic(void __user *to,
5015b494 SR	379	const void *from, unsigned long n)
2df5e8bc SR	380	{
2df5e8bc SR	381	if (__builtin_constant_p(n) && (n <= 8)) {
9c8387af	382	unsigned long ret = 1;
2df5e8bc SR	383
	384	switch (n) {
	385	case 1:
	386	__put_user_size((u8 )from, (u8 __user *)to, 1, ret);
	387	break;
	388	case 2:
	389	__put_user_size((u16 )from, (u16 __user *)to, 2, ret);
	390	break;
	391	case 4:
	392	__put_user_size((u32 )from, (u32 __user *)to, 4, ret);
	393	break;
	394	case 8:
	395	__put_user_size((u64 )from, (u64 __user *)to, 8, ret);
	396	break;
	397	}
48fe4871 SR	398	if (ret == 0)
48fe4871 SR	399	return 0;
2df5e8bc	400	}
48fe4871	401	return __copy_tofrom_user(to, (__force const void __user *)from, n);
2df5e8bc SR	402	}
2df5e8bc SR	403
5015b494 SR	404	static inline unsigned long __copy_from_user(void *to,
5015b494 SR	405	const void __user *from, unsigned long size)
2df5e8bc	406	{
1af1717d	407	might_fault();
2df5e8bc	408	return __copy_from_user_inatomic(to, from, size);
2df5e8bc SR	409	}
2df5e8bc SR	410
5015b494 SR	411	static inline unsigned long __copy_to_user(void __user *to,
5015b494 SR	412	const void *from, unsigned long size)
2df5e8bc	413	{
1af1717d	414	might_fault();
2df5e8bc	415	return __copy_to_user_inatomic(to, from, size);
2df5e8bc SR	416	}
2df5e8bc SR	417
2df5e8bc SR	418	extern unsigned long __clear_user(void __user *addr, unsigned long size);
	419
	420	static inline unsigned long clear_user(void __user *addr, unsigned long size)
	421	{
1af1717d	422	might_fault();
2df5e8bc SR	423	if (likely(access_ok(VERIFY_WRITE, addr, size)))
2df5e8bc SR	424	return __clear_user(addr, size);
2df5e8bc SR	425	if ((unsigned long)addr < TASK_SIZE) {
	426	unsigned long over = (unsigned long)addr + size - TASK_SIZE;
	427	return __clear_user(addr, size - over) + over;
	428	}
2df5e8bc SR	429	return size;
	430	}
	431
1629372c PM	432	extern long strncpy_from_user(char dst, const char __user src, long count);
	433	extern __must_check long strlen_user(const char __user *str);
	434	extern __must_check long strnlen_user(const char __user *str, long n);
2df5e8bc SR	435
	436	#endif /* __ASSEMBLY__ */
	437	#endif /* __KERNEL__ */
	438
	439	#endif /* _ARCH_POWERPC_UACCESS_H */