[thirdparty/kernel/stable.git] / arch / powerpc / include / asm / uaccess.h

/* SPDX-License-Identifier: GPL-2.0 */
#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), (void)(type),		\
	 __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)

/*
 * This is a type: either unsigned long, if the argument fits into
 * that type, or otherwise unsigned long long.
 */
#define __long_type(x) \
	__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))

#define __get_user_nocheck(x, ptr, size)			\
({								\
	long __gu_err;						\
	__long_type(*(ptr)) __gu_val;				\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
	__chk_user_ptr(ptr);					\
	if (!is_kernel_addr((unsigned long)__gu_addr))		\
		might_fault();					\
	barrier_nospec();					\
	__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;					\
	__long_type(*(ptr)) __gu_val = 0;				\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);		\
	might_fault();							\
	if (access_ok(VERIFY_READ, __gu_addr, (size))) {		\
		barrier_nospec();					\
		__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;						\
	__long_type(*(ptr)) __gu_val;				\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
	__chk_user_ptr(ptr);					\
	barrier_nospec();					\
	__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:
			barrier_nospec();
			__get_user_size(*(u8 *)to, from, 1, ret);
			break;
		case 2:
			barrier_nospec();
			__get_user_size(*(u16 *)to, from, 2, ret);
			break;
		case 4:
			barrier_nospec();
			__get_user_size(*(u32 *)to, from, 4, ret);
			break;
		case 8:
			barrier_nospec();
			__get_user_size(*(u64 *)to, from, 8, ret);
			break;
		}
		if (ret == 0)
			return 0;
	}

	barrier_nospec();
	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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
2df5e8bc SR	2	#ifndef _ARCH_POWERPC_UACCESS_H
	3	#define _ARCH_POWERPC_UACCESS_H
	4
551c3c04	5	#include <asm/asm-compat.h>
24bfa6a9	6	#include <asm/ppc_asm.h>
2df5e8bc	7	#include <asm/processor.h>
6bfd93c3	8	#include <asm/page.h>
527b5bae	9	#include <asm/extable.h>
2df5e8bc	10
2df5e8bc SR	11	/*
	12	* The fs value determines whether argument validity checking should be
	13	* performed or not. If get_fs() == USER_DS, checking is performed, with
	14	* get_fs() == KERNEL_DS, checking is bypassed.
	15	*
	16	* For historical reasons, these macros are grossly misnamed.
	17	*
	18	* The fs/ds values are now the highest legal address in the "segment".
	19	* This simplifies the checking in the routines below.
	20	*/
	21
	22	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	23
5015b494	24	#define KERNEL_DS MAKE_MM_SEG(~0UL)
2df5e8bc	25	#ifdef __powerpc64__
5015b494 SR	26	/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
5015b494 SR	27	#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
2df5e8bc	28	#else
2df5e8bc SR	29	#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
	30	#endif
	31
	32	#define get_ds() (KERNEL_DS)
	33	#define get_fs() (current->thread.fs)
	34	#define set_fs(val) (current->thread.fs = (val))
	35
	36	#define segment_eq(a, b) ((a).seg == (b).seg)
	37
1629372c PM	38	#define user_addr_max() (get_fs().seg)
1629372c PM	39
2df5e8bc SR	40	#ifdef __powerpc64__
2df5e8bc SR	41	/*
5015b494 SR	42	* This check is sufficient because there is a large enough
5015b494 SR	43	* gap between user addresses and the kernel addresses
2df5e8bc SR	44	*/
2df5e8bc SR	45	#define __access_ok(addr, size, segment) \
5015b494	46	(((addr) <= (segment).seg) && ((size) <= (segment).seg))
2df5e8bc SR	47
	48	#else
	49
	50	#define __access_ok(addr, size, segment) \
	51	(((addr) <= (segment).seg) && \
	52	(((size) == 0) \|\| (((size) - 1) <= ((segment).seg - (addr)))))
	53
	54	#endif
	55
	56	#define access_ok(type, addr, size) \
e93ea07f	57	(__chk_user_ptr(addr), (void)(type), \
2df5e8bc SR	58	__access_ok((__force unsigned long)(addr), (size), get_fs()))
2df5e8bc SR	59
2df5e8bc SR	60	/*
	61	* These are the main single-value transfer routines. They automatically
	62	* use the right size if we just have the right pointer type.
	63	*
	64	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	65	* and yet we don't want to do any pointers, because that is too much
	66	* of a performance impact. Thus we have a few rather ugly macros here,
	67	* and hide all the ugliness from the user.
	68	*
	69	* The "__xxx" versions of the user access functions are versions that
	70	* do not verify the address space, that must have been done previously
	71	* with a separate "access_ok()" call (this is used when we do multiple
	72	* accesses to the same area of user memory).
	73	*
	74	* As we use the same address space for kernel and user data on the
	75	* PowerPC, we can just do these as direct assignments. (Of course, the
	76	* exception handling means that it's no longer "just"...)
	77	*
2df5e8bc SR	78	*/
	79	#define get_user(x, ptr) \
	80	__get_user_check((x), (ptr), sizeof(*(ptr)))
	81	#define put_user(x, ptr) \
	82	__put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	83
	84	#define __get_user(x, ptr) \
	85	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	86	#define __put_user(x, ptr) \
	87	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
e68c825b	88
e68c825b BH	89	#define __get_user_inatomic(x, ptr) \
	90	__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
	91	#define __put_user_inatomic(x, ptr) \
	92	__put_user_nosleep((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	93
2df5e8bc SR	94	extern long __put_user_bad(void);
2df5e8bc SR	95
2df5e8bc SR	96	/*
	97	* We don't tell gcc that we are accessing memory, but this is OK
	98	* because we do not write to any memory gcc knows about, so there
	99	* are no aliasing issues.
	100	*/
	101	#define __put_user_asm(x, addr, err, op) \
	102	__asm__ __volatile__( \
	103	"1: " op " %1,0(%2) # put_user\n" \
	104	"2:\n" \
	105	".section .fixup,\"ax\"\n" \
	106	"3: li %0,%3\n" \
	107	" b 2b\n" \
	108	".previous\n" \
24bfa6a9	109	EX_TABLE(1b, 3b) \
2df5e8bc	110	: "=r" (err) \
551c3c04	111	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc	112
5015b494 SR	113	#ifdef __powerpc64__
	114	#define __put_user_asm2(x, ptr, retval) \
	115	__put_user_asm(x, ptr, retval, "std")
	116	#else /* __powerpc64__ */
2df5e8bc SR	117	#define __put_user_asm2(x, addr, err) \
	118	__asm__ __volatile__( \
	119	"1: stw %1,0(%2)\n" \
	120	"2: stw %1+1,4(%2)\n" \
	121	"3:\n" \
	122	".section .fixup,\"ax\"\n" \
	123	"4: li %0,%3\n" \
	124	" b 3b\n" \
	125	".previous\n" \
24bfa6a9 NP	126	EX_TABLE(1b, 4b) \
24bfa6a9 NP	127	EX_TABLE(2b, 4b) \
2df5e8bc	128	: "=r" (err) \
551c3c04	129	: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc SR	130	#endif /* __powerpc64__ */
	131
	132	#define __put_user_size(x, ptr, size, retval) \
	133	do { \
	134	retval = 0; \
	135	switch (size) { \
	136	case 1: __put_user_asm(x, ptr, retval, "stb"); break; \
	137	case 2: __put_user_asm(x, ptr, retval, "sth"); break; \
	138	case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
	139	case 8: __put_user_asm2(x, ptr, retval); break; \
	140	default: __put_user_bad(); \
	141	} \
	142	} while (0)
	143
	144	#define __put_user_nocheck(x, ptr, size) \
	145	({ \
	146	long __pu_err; \
6bfd93c3 PM	147	__typeof__((ptr)) __user __pu_addr = (ptr); \
6bfd93c3 PM	148	if (!is_kernel_addr((unsigned long)__pu_addr)) \
1af1717d	149	might_fault(); \
2df5e8bc	150	__chk_user_ptr(ptr); \
6bfd93c3	151	__put_user_size((x), __pu_addr, (size), __pu_err); \
2df5e8bc SR	152	__pu_err; \
	153	})
	154
	155	#define __put_user_check(x, ptr, size) \
	156	({ \
	157	long __pu_err = -EFAULT; \
	158	__typeof__((ptr)) __user __pu_addr = (ptr); \
1af1717d	159	might_fault(); \
2df5e8bc SR	160	if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
	161	__put_user_size((x), __pu_addr, (size), __pu_err); \
	162	__pu_err; \
	163	})
	164
e68c825b BH	165	#define __put_user_nosleep(x, ptr, size) \
	166	({ \
	167	long __pu_err; \
	168	__typeof__((ptr)) __user __pu_addr = (ptr); \
	169	__chk_user_ptr(ptr); \
	170	__put_user_size((x), __pu_addr, (size), __pu_err); \
	171	__pu_err; \
	172	})
	173
	174
2df5e8bc SR	175	extern long __get_user_bad(void);
	176
	177	#define __get_user_asm(x, addr, err, op) \
	178	__asm__ __volatile__( \
5015b494	179	"1: "op" %1,0(%2) # get_user\n" \
2df5e8bc SR	180	"2:\n" \
	181	".section .fixup,\"ax\"\n" \
	182	"3: li %0,%3\n" \
	183	" li %1,0\n" \
	184	" b 2b\n" \
	185	".previous\n" \
24bfa6a9	186	EX_TABLE(1b, 3b) \
2df5e8bc	187	: "=r" (err), "=r" (x) \
551c3c04	188	: "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc	189
5015b494 SR	190	#ifdef __powerpc64__
	191	#define __get_user_asm2(x, addr, err) \
	192	__get_user_asm(x, addr, err, "ld")
	193	#else /* __powerpc64__ */
	194	#define __get_user_asm2(x, addr, err) \
2df5e8bc SR	195	__asm__ __volatile__( \
	196	"1: lwz %1,0(%2)\n" \
	197	"2: lwz %1+1,4(%2)\n" \
	198	"3:\n" \
	199	".section .fixup,\"ax\"\n" \
	200	"4: li %0,%3\n" \
	201	" li %1,0\n" \
	202	" li %1+1,0\n" \
	203	" b 3b\n" \
	204	".previous\n" \
24bfa6a9 NP	205	EX_TABLE(1b, 4b) \
24bfa6a9 NP	206	EX_TABLE(2b, 4b) \
2df5e8bc	207	: "=r" (err), "=&r" (x) \
551c3c04	208	: "b" (addr), "i" (-EFAULT), "0" (err))
2df5e8bc SR	209	#endif /* __powerpc64__ */
	210
	211	#define __get_user_size(x, ptr, size, retval) \
	212	do { \
	213	retval = 0; \
	214	__chk_user_ptr(ptr); \
5015b494 SR	215	if (size > sizeof(x)) \
5015b494 SR	216	(x) = __get_user_bad(); \
2df5e8bc SR	217	switch (size) { \
	218	case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
	219	case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
	220	case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \
	221	case 8: __get_user_asm2(x, ptr, retval); break; \
	222	default: (x) = __get_user_bad(); \
	223	} \
	224	} while (0)
	225
c20a5e06 ME	226	/*
	227	* This is a type: either unsigned long, if the argument fits into
	228	* that type, or otherwise unsigned long long.
	229	*/
	230	#define __long_type(x) \
	231	__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
	232
2df5e8bc SR	233	#define __get_user_nocheck(x, ptr, size) \
	234	({ \
	235	long __gu_err; \
c20a5e06	236	__long_type(*(ptr)) __gu_val; \
d466f6c5	237	const __typeof__((ptr)) __user __gu_addr = (ptr); \
2df5e8bc	238	__chk_user_ptr(ptr); \
6bfd93c3	239	if (!is_kernel_addr((unsigned long)__gu_addr)) \
1af1717d	240	might_fault(); \
3692ca6f	241	barrier_nospec(); \
6bfd93c3	242	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
2df5e8bc SR	243	(x) = (__typeof__(*(ptr)))__gu_val; \
	244	__gu_err; \
	245	})
	246
2df5e8bc SR	247	#define __get_user_check(x, ptr, size) \
	248	({ \
	249	long __gu_err = -EFAULT; \
c20a5e06	250	__long_type(*(ptr)) __gu_val = 0; \
f84ed59a	251	const __typeof__((ptr)) __user __gu_addr = (ptr); \
1af1717d	252	might_fault(); \
3692ca6f ME	253	if (access_ok(VERIFY_READ, __gu_addr, (size))) { \
3692ca6f ME	254	barrier_nospec(); \
2df5e8bc	255	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
3692ca6f	256	} \
505e4283	257	(x) = (__force __typeof__(*(ptr)))__gu_val; \
2df5e8bc SR	258	__gu_err; \
	259	})
	260
e68c825b BH	261	#define __get_user_nosleep(x, ptr, size) \
	262	({ \
	263	long __gu_err; \
c20a5e06	264	__long_type(*(ptr)) __gu_val; \
f2ca8090	265	const __typeof__((ptr)) __user __gu_addr = (ptr); \
e68c825b	266	__chk_user_ptr(ptr); \
3692ca6f	267	barrier_nospec(); \
e68c825b	268	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
505e4283	269	(x) = (__force __typeof__(*(ptr)))__gu_val; \
e68c825b BH	270	__gu_err; \
	271	})
	272
	273
2df5e8bc SR	274	/* more complex routines */
	275
	276	extern unsigned long __copy_tofrom_user(void __user *to,
	277	const void __user *from, unsigned long size);
	278
d6bd8194	279	#ifdef __powerpc64__
3448890c AV	280	static inline unsigned long
	281	raw_copy_in_user(void __user to, const void __user from, unsigned long n)
	282	{
	283	return __copy_tofrom_user(to, from, n);
	284	}
48fe4871 SR	285	#endif /* __powerpc64__ */
48fe4871 SR	286
3448890c	287	static inline unsigned long raw_copy_from_user(void *to,
5015b494	288	const void __user *from, unsigned long n)
2df5e8bc SR	289	{
2df5e8bc SR	290	if (__builtin_constant_p(n) && (n <= 8)) {
9c8387af	291	unsigned long ret = 1;
2df5e8bc SR	292
	293	switch (n) {
	294	case 1:
3692ca6f	295	barrier_nospec();
2df5e8bc SR	296	__get_user_size((u8 )to, from, 1, ret);
	297	break;
	298	case 2:
3692ca6f	299	barrier_nospec();
2df5e8bc SR	300	__get_user_size((u16 )to, from, 2, ret);
	301	break;
	302	case 4:
3692ca6f	303	barrier_nospec();
2df5e8bc SR	304	__get_user_size((u32 )to, from, 4, ret);
	305	break;
	306	case 8:
3692ca6f	307	barrier_nospec();
2df5e8bc SR	308	__get_user_size((u64 )to, from, 8, ret);
	309	break;
	310	}
48fe4871 SR	311	if (ret == 0)
48fe4871 SR	312	return 0;
2df5e8bc	313	}
1d3c1324	314
3692ca6f	315	barrier_nospec();
48fe4871	316	return __copy_tofrom_user((__force void __user *)to, from, n);
2df5e8bc SR	317	}
2df5e8bc SR	318
3448890c	319	static inline unsigned long raw_copy_to_user(void __user *to,
5015b494	320	const void *from, unsigned long n)
2df5e8bc SR	321	{
2df5e8bc SR	322	if (__builtin_constant_p(n) && (n <= 8)) {
9c8387af	323	unsigned long ret = 1;
2df5e8bc SR	324
	325	switch (n) {
	326	case 1:
	327	__put_user_size((u8 )from, (u8 __user *)to, 1, ret);
	328	break;
	329	case 2:
	330	__put_user_size((u16 )from, (u16 __user *)to, 2, ret);
	331	break;
	332	case 4:
	333	__put_user_size((u32 )from, (u32 __user *)to, 4, ret);
	334	break;
	335	case 8:
	336	__put_user_size((u64 )from, (u64 __user *)to, 8, ret);
	337	break;
	338	}
48fe4871 SR	339	if (ret == 0)
48fe4871 SR	340	return 0;
2df5e8bc	341	}
81409e9e	342
48fe4871	343	return __copy_tofrom_user(to, (__force const void __user *)from, n);
2df5e8bc SR	344	}
2df5e8bc SR	345
2df5e8bc SR	346	extern unsigned long __clear_user(void __user *addr, unsigned long size);
	347
	348	static inline unsigned long clear_user(void __user *addr, unsigned long size)
	349	{
1af1717d	350	might_fault();
2df5e8bc SR	351	if (likely(access_ok(VERIFY_WRITE, addr, size)))
2df5e8bc SR	352	return __clear_user(addr, size);
2df5e8bc SR	353	return size;
	354	}
	355
1629372c	356	extern long strncpy_from_user(char dst, const char __user src, long count);
1629372c	357	extern __must_check long strnlen_user(const char __user *str, long n);
2df5e8bc	358
2df5e8bc	359	#endif /* _ARCH_POWERPC_UACCESS_H */