[linux-2.6-block.git] / arch / alpha / include / asm / uaccess.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ALPHA_UACCESS_H
#define __ALPHA_UACCESS_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.
 *
 * Or at least it did once upon a time.  Nowadays it is a mask that
 * defines which bits of the address space are off limits.  This is a
 * wee bit faster than the above.
 *
 * For historical reasons, these macros are grossly misnamed.
 */

#define KERNEL_DS	((mm_segment_t) { 0UL })
#define USER_DS		((mm_segment_t) { -0x40000000000UL })

#define get_fs()  (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))

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

/*
 * Is a address valid? This does a straightforward calculation rather
 * than tests.
 *
 * Address valid if:
 *  - "addr" doesn't have any high-bits set
 *  - AND "size" doesn't have any high-bits set
 *  - AND "addr+size-(size != 0)" doesn't have any high-bits set
 *  - OR we are in kernel mode.
 */
#define __access_ok(addr, size) ({				\
	unsigned long __ao_a = (addr), __ao_b = (size);		\
	unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b;	\
	(get_fs().seg & (__ao_a | __ao_b | __ao_end)) == 0; })

#define access_ok(addr, size)				\
({							\
	__chk_user_ptr(addr);				\
	__access_ok(((unsigned long)(addr)), (size));	\
})

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * As the alpha uses the same address space for kernel and user
 * data, we can just do these as direct assignments.  (Of course, the
 * exception handling means that it's no longer "just"...)
 *
 * Careful to not
 * (a) re-use the arguments for side effects (sizeof/typeof is ok)
 * (b) require any knowledge of processes at this stage
 */
#define put_user(x, ptr) \
  __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define get_user(x, ptr) \
  __get_user_check((x), (ptr), sizeof(*(ptr)))

/*
 * The "__xxx" versions do not do address space checking, useful when
 * doing multiple accesses to the same area (the programmer has to do the
 * checks by hand with "access_ok()")
 */
#define __put_user(x, ptr) \
  __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
  __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
  
/*
 * The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to
 * encode the bits we need for resolving the exception.  See the
 * more extensive comments with fixup_inline_exception below for
 * more information.
 */
#define EXC(label,cont,res,err)				\
	".section __ex_table,\"a\"\n"			\
	"	.long "#label"-.\n"			\
	"	lda "#res","#cont"-"#label"("#err")\n"	\
	".previous\n"

extern void __get_user_unknown(void);

#define __get_user_nocheck(x, ptr, size)			\
({								\
	long __gu_err = 0;					\
	unsigned long __gu_val;					\
	__chk_user_ptr(ptr);					\
	switch (size) {						\
	  case 1: __get_user_8(ptr); break;			\
	  case 2: __get_user_16(ptr); break;			\
	  case 4: __get_user_32(ptr); break;			\
	  case 8: __get_user_64(ptr); break;			\
	  default: __get_user_unknown(); break;			\
	}							\
	(x) = (__force __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);	\
	if (__access_ok((unsigned long)__gu_addr, size)) {	\
		__gu_err = 0;					\
		switch (size) {					\
		  case 1: __get_user_8(__gu_addr); break;	\
		  case 2: __get_user_16(__gu_addr); break;	\
		  case 4: __get_user_32(__gu_addr); break;	\
		  case 8: __get_user_64(__gu_addr); break;	\
		  default: __get_user_unknown(); break;		\
		}						\
	}							\
	(x) = (__force __typeof__(*(ptr))) __gu_val;		\
	__gu_err;						\
})

struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))

#define __get_user_64(addr)				\
	__asm__("1: ldq %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))

#define __get_user_32(addr)				\
	__asm__("1: ldl %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))

#ifdef __alpha_bwx__
/* Those lucky bastards with ev56 and later CPUs can do byte/word moves.  */

#define __get_user_16(addr)				\
	__asm__("1: ldwu %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))

#define __get_user_8(addr)				\
	__asm__("1: ldbu %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))
#else
/* Unfortunately, we can't get an unaligned access trap for the sub-word
   load, so we have to do a general unaligned operation.  */

#define __get_user_16(addr)						\
{									\
	long __gu_tmp;							\
	__asm__("1: ldq_u %0,0(%3)\n"					\
	"2:	ldq_u %1,1(%3)\n"					\
	"	extwl %0,%3,%0\n"					\
	"	extwh %1,%3,%1\n"					\
	"	or %0,%1,%0\n"						\
	"3:\n"								\
	EXC(1b,3b,%0,%2)						\
	EXC(2b,3b,%0,%2)						\
		: "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err)	\
		: "r"(addr), "2"(__gu_err));				\
}

#define __get_user_8(addr)						\
	__asm__("1: ldq_u %0,0(%2)\n"					\
	"	extbl %0,%2,%0\n"					\
	"2:\n"								\
	EXC(1b,2b,%0,%1)						\
		: "=&r"(__gu_val), "=r"(__gu_err)			\
		: "r"(addr), "1"(__gu_err))
#endif

extern void __put_user_unknown(void);

#define __put_user_nocheck(x, ptr, size)			\
({								\
	long __pu_err = 0;					\
	__chk_user_ptr(ptr);					\
	switch (size) {						\
	  case 1: __put_user_8(x, ptr); break;			\
	  case 2: __put_user_16(x, ptr); break;			\
	  case 4: __put_user_32(x, ptr); break;			\
	  case 8: __put_user_64(x, ptr); break;			\
	  default: __put_user_unknown(); break;			\
	}							\
	__pu_err;						\
})

#define __put_user_check(x, ptr, size)				\
({								\
	long __pu_err = -EFAULT;				\
	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
	if (__access_ok((unsigned long)__pu_addr, size)) {	\
		__pu_err = 0;					\
		switch (size) {					\
		  case 1: __put_user_8(x, __pu_addr); break;	\
		  case 2: __put_user_16(x, __pu_addr); break;	\
		  case 4: __put_user_32(x, __pu_addr); break;	\
		  case 8: __put_user_64(x, __pu_addr); break;	\
		  default: __put_user_unknown(); break;		\
		}						\
	}							\
	__pu_err;						\
})

/*
 * The "__put_user_xx()" macros tell gcc they read from memory
 * instead of writing: this is because they do not write to
 * any memory gcc knows about, so there are no aliasing issues
 */
#define __put_user_64(x, addr)					\
__asm__ __volatile__("1: stq %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m" (__m(addr)), "rJ" (x), "0"(__pu_err))

#define __put_user_32(x, addr)					\
__asm__ __volatile__("1: stl %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))

#ifdef __alpha_bwx__
/* Those lucky bastards with ev56 and later CPUs can do byte/word moves.  */

#define __put_user_16(x, addr)					\
__asm__ __volatile__("1: stw %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))

#define __put_user_8(x, addr)					\
__asm__ __volatile__("1: stb %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
#else
/* Unfortunately, we can't get an unaligned access trap for the sub-word
   write, so we have to do a general unaligned operation.  */

#define __put_user_16(x, addr)					\
{								\
	long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4;	\
	__asm__ __volatile__(					\
	"1:	ldq_u %2,1(%5)\n"				\
	"2:	ldq_u %1,0(%5)\n"				\
	"	inswh %6,%5,%4\n"				\
	"	inswl %6,%5,%3\n"				\
	"	mskwh %2,%5,%2\n"				\
	"	mskwl %1,%5,%1\n"				\
	"	or %2,%4,%2\n"					\
	"	or %1,%3,%1\n"					\
	"3:	stq_u %2,1(%5)\n"				\
	"4:	stq_u %1,0(%5)\n"				\
	"5:\n"							\
	EXC(1b,5b,$31,%0)					\
	EXC(2b,5b,$31,%0)					\
	EXC(3b,5b,$31,%0)					\
	EXC(4b,5b,$31,%0)					\
		: "=r"(__pu_err), "=&r"(__pu_tmp1), 		\
		  "=&r"(__pu_tmp2), "=&r"(__pu_tmp3), 		\
		  "=&r"(__pu_tmp4)				\
		: "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \
}

#define __put_user_8(x, addr)					\
{								\
	long __pu_tmp1, __pu_tmp2;				\
	__asm__ __volatile__(					\
	"1:	ldq_u %1,0(%4)\n"				\
	"	insbl %3,%4,%2\n"				\
	"	mskbl %1,%4,%1\n"				\
	"	or %1,%2,%1\n"					\
	"2:	stq_u %1,0(%4)\n"				\
	"3:\n"							\
	EXC(1b,3b,$31,%0)					\
	EXC(2b,3b,$31,%0)					\
		: "=r"(__pu_err), 				\
	  	  "=&r"(__pu_tmp1), "=&r"(__pu_tmp2)		\
		: "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \
}
#endif


/*
 * Complex access routines
 */

extern long __copy_user(void *to, const void *from, long len);

static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long len)
{
	return __copy_user(to, (__force const void *)from, len);
}

static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long len)
{
	return __copy_user((__force void *)to, from, len);
}

extern long __clear_user(void __user *to, long len);

extern inline long
clear_user(void __user *to, long len)
{
	if (__access_ok((unsigned long)to, len))
		len = __clear_user(to, len);
	return len;
}

#define user_addr_max() \
        (uaccess_kernel() ? ~0UL : TASK_SIZE)

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

#include <asm/extable.h>

#endif /* __ALPHA_UACCESS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef __ALPHA_UACCESS_H
	3	#define __ALPHA_UACCESS_H
	4
1da177e4 LT	5	/*
	6	* The fs value determines whether argument validity checking should be
	7	* performed or not. If get_fs() == USER_DS, checking is performed, with
	8	* get_fs() == KERNEL_DS, checking is bypassed.
	9	*
	10	* Or at least it did once upon a time. Nowadays it is a mask that
	11	* defines which bits of the address space are off limits. This is a
	12	* wee bit faster than the above.
	13	*
	14	* For historical reasons, these macros are grossly misnamed.
	15	*/
	16
	17	#define KERNEL_DS ((mm_segment_t) { 0UL })
	18	#define USER_DS ((mm_segment_t) { -0x40000000000UL })
	19
1da177e4	20	#define get_fs() (current_thread_info()->addr_limit)
1da177e4 LT	21	#define set_fs(x) (current_thread_info()->addr_limit = (x))
1da177e4 LT	22
4fb9bccb	23	#define segment_eq(a, b) ((a).seg == (b).seg)
1da177e4 LT	24
	25	/*
	26	* Is a address valid? This does a straightforward calculation rather
	27	* than tests.
	28	*
	29	* Address valid if:
	30	* - "addr" doesn't have any high-bits set
	31	* - AND "size" doesn't have any high-bits set
94bd8a05	32	* - AND "addr+size-(size != 0)" doesn't have any high-bits set
1da177e4 LT	33	* - OR we are in kernel mode.
1da177e4 LT	34	*/
94bd8a05 LT	35	#define __access_ok(addr, size) ({ \
	36	unsigned long __ao_a = (addr), __ao_b = (size); \
	37	unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \
	38	(get_fs().seg & (__ao_a \| __ao_b \| __ao_end)) == 0; })
1da177e4	39
96d4f267	40	#define access_ok(addr, size) \
c9df6025 AV	41	({ \
	42	__chk_user_ptr(addr); \
	43	__access_ok(((unsigned long)(addr)), (size)); \
1da177e4 LT	44	})
1da177e4 LT	45
1da177e4 LT	46	/*
	47	* These are the main single-value transfer routines. They automatically
	48	* use the right size if we just have the right pointer type.
	49	*
	50	* As the alpha uses the same address space for kernel and user
	51	* data, we can just do these as direct assignments. (Of course, the
	52	* exception handling means that it's no longer "just"...)
	53	*
	54	* Careful to not
	55	* (a) re-use the arguments for side effects (sizeof/typeof is ok)
	56	* (b) require any knowledge of processes at this stage
	57	*/
4fb9bccb	58	#define put_user(x, ptr) \
d78d834b	59	__put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
4fb9bccb	60	#define get_user(x, ptr) \
d78d834b	61	__get_user_check((x), (ptr), sizeof(*(ptr)))
1da177e4 LT	62
	63	/*
	64	* The "__xxx" versions do not do address space checking, useful when
	65	* doing multiple accesses to the same area (the programmer has to do the
	66	* checks by hand with "access_ok()")
	67	*/
4fb9bccb MT	68	#define __put_user(x, ptr) \
	69	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	70	#define __get_user(x, ptr) \
	71	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
1da177e4 LT	72
	73	/*
	74	* The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to
	75	* encode the bits we need for resolving the exception. See the
	76	* more extensive comments with fixup_inline_exception below for
	77	* more information.
	78	*/
ca282f69 AV	79	#define EXC(label,cont,res,err) \
	80	".section __ex_table,\"a\"\n" \
	81	" .long "#label"-.\n" \
	82	" lda "#res","#cont"-"#label"("#err")\n" \
	83	".previous\n"
1da177e4 LT	84
	85	extern void __get_user_unknown(void);
	86
4fb9bccb	87	#define __get_user_nocheck(x, ptr, size) \
1da177e4 LT	88	({ \
	89	long __gu_err = 0; \
	90	unsigned long __gu_val; \
	91	__chk_user_ptr(ptr); \
	92	switch (size) { \
	93	case 1: __get_user_8(ptr); break; \
	94	case 2: __get_user_16(ptr); break; \
	95	case 4: __get_user_32(ptr); break; \
	96	case 8: __get_user_64(ptr); break; \
	97	default: __get_user_unknown(); break; \
	98	} \
1ab5786a	99	(x) = (__force __typeof__(*(ptr))) __gu_val; \
1da177e4 LT	100	__gu_err; \
	101	})
	102
c9df6025 AV	103	#define __get_user_check(x, ptr, size) \
	104	({ \
	105	long __gu_err = -EFAULT; \
	106	unsigned long __gu_val = 0; \
	107	const __typeof__((ptr)) __user __gu_addr = (ptr); \
	108	if (__access_ok((unsigned long)__gu_addr, size)) { \
	109	__gu_err = 0; \
	110	switch (size) { \
	111	case 1: __get_user_8(__gu_addr); break; \
	112	case 2: __get_user_16(__gu_addr); break; \
	113	case 4: __get_user_32(__gu_addr); break; \
	114	case 8: __get_user_64(__gu_addr); break; \
	115	default: __get_user_unknown(); break; \
	116	} \
	117	} \
	118	(x) = (__force __typeof__(*(ptr))) __gu_val; \
	119	__gu_err; \
1da177e4 LT	120	})
	121
	122	struct __large_struct { unsigned long buf[100]; };
	123	#define __m(x) ((struct __large_struct __user )(x))
	124
	125	#define __get_user_64(addr) \
	126	__asm__("1: ldq %0,%2\n" \
	127	"2:\n" \
ca282f69	128	EXC(1b,2b,%0,%1) \
1da177e4 LT	129	: "=r"(__gu_val), "=r"(__gu_err) \
	130	: "m"(__m(addr)), "1"(__gu_err))
	131
	132	#define __get_user_32(addr) \
	133	__asm__("1: ldl %0,%2\n" \
	134	"2:\n" \
ca282f69	135	EXC(1b,2b,%0,%1) \
1da177e4 LT	136	: "=r"(__gu_val), "=r"(__gu_err) \
	137	: "m"(__m(addr)), "1"(__gu_err))
	138
	139	#ifdef __alpha_bwx__
	140	/* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */
	141
	142	#define __get_user_16(addr) \
	143	__asm__("1: ldwu %0,%2\n" \
	144	"2:\n" \
ca282f69	145	EXC(1b,2b,%0,%1) \
1da177e4 LT	146	: "=r"(__gu_val), "=r"(__gu_err) \
	147	: "m"(__m(addr)), "1"(__gu_err))
	148
	149	#define __get_user_8(addr) \
	150	__asm__("1: ldbu %0,%2\n" \
	151	"2:\n" \
ca282f69	152	EXC(1b,2b,%0,%1) \
1da177e4 LT	153	: "=r"(__gu_val), "=r"(__gu_err) \
	154	: "m"(__m(addr)), "1"(__gu_err))
	155	#else
	156	/* Unfortunately, we can't get an unaligned access trap for the sub-word
	157	load, so we have to do a general unaligned operation. */
	158
	159	#define __get_user_16(addr) \
	160	{ \
	161	long __gu_tmp; \
	162	__asm__("1: ldq_u %0,0(%3)\n" \
	163	"2: ldq_u %1,1(%3)\n" \
	164	" extwl %0,%3,%0\n" \
	165	" extwh %1,%3,%1\n" \
	166	" or %0,%1,%0\n" \
	167	"3:\n" \
ca282f69 AV	168	EXC(1b,3b,%0,%2) \
ca282f69 AV	169	EXC(2b,3b,%0,%2) \
1da177e4 LT	170	: "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err) \
	171	: "r"(addr), "2"(__gu_err)); \
	172	}
	173
	174	#define __get_user_8(addr) \
	175	__asm__("1: ldq_u %0,0(%2)\n" \
	176	" extbl %0,%2,%0\n" \
	177	"2:\n" \
ca282f69	178	EXC(1b,2b,%0,%1) \
1da177e4 LT	179	: "=&r"(__gu_val), "=r"(__gu_err) \
	180	: "r"(addr), "1"(__gu_err))
	181	#endif
	182
	183	extern void __put_user_unknown(void);
	184
4fb9bccb	185	#define __put_user_nocheck(x, ptr, size) \
1da177e4 LT	186	({ \
	187	long __pu_err = 0; \
	188	__chk_user_ptr(ptr); \
	189	switch (size) { \
4fb9bccb MT	190	case 1: __put_user_8(x, ptr); break; \
	191	case 2: __put_user_16(x, ptr); break; \
	192	case 4: __put_user_32(x, ptr); break; \
	193	case 8: __put_user_64(x, ptr); break; \
1da177e4 LT	194	default: __put_user_unknown(); break; \
	195	} \
	196	__pu_err; \
	197	})
	198
c9df6025 AV	199	#define __put_user_check(x, ptr, size) \
	200	({ \
	201	long __pu_err = -EFAULT; \
	202	__typeof__((ptr)) __user __pu_addr = (ptr); \
	203	if (__access_ok((unsigned long)__pu_addr, size)) { \
	204	__pu_err = 0; \
	205	switch (size) { \
	206	case 1: __put_user_8(x, __pu_addr); break; \
	207	case 2: __put_user_16(x, __pu_addr); break; \
	208	case 4: __put_user_32(x, __pu_addr); break; \
	209	case 8: __put_user_64(x, __pu_addr); break; \
	210	default: __put_user_unknown(); break; \
	211	} \
	212	} \
	213	__pu_err; \
1da177e4 LT	214	})
	215
	216	/*
	217	* The "__put_user_xx()" macros tell gcc they read from memory
	218	* instead of writing: this is because they do not write to
	219	* any memory gcc knows about, so there are no aliasing issues
	220	*/
4fb9bccb	221	#define __put_user_64(x, addr) \
1da177e4 LT	222	__asm__ __volatile__("1: stq %r2,%1\n" \
1da177e4 LT	223	"2:\n" \
ca282f69	224	EXC(1b,2b,$31,%0) \
1da177e4 LT	225	: "=r"(__pu_err) \
	226	: "m" (__m(addr)), "rJ" (x), "0"(__pu_err))
	227
4fb9bccb	228	#define __put_user_32(x, addr) \
1da177e4 LT	229	__asm__ __volatile__("1: stl %r2,%1\n" \
1da177e4 LT	230	"2:\n" \
ca282f69	231	EXC(1b,2b,$31,%0) \
1da177e4 LT	232	: "=r"(__pu_err) \
	233	: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
	234
	235	#ifdef __alpha_bwx__
	236	/* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */
	237
4fb9bccb	238	#define __put_user_16(x, addr) \
1da177e4 LT	239	__asm__ __volatile__("1: stw %r2,%1\n" \
1da177e4 LT	240	"2:\n" \
ca282f69	241	EXC(1b,2b,$31,%0) \
1da177e4 LT	242	: "=r"(__pu_err) \
	243	: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
	244
4fb9bccb	245	#define __put_user_8(x, addr) \
1da177e4 LT	246	__asm__ __volatile__("1: stb %r2,%1\n" \
1da177e4 LT	247	"2:\n" \
ca282f69	248	EXC(1b,2b,$31,%0) \
1da177e4 LT	249	: "=r"(__pu_err) \
	250	: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
	251	#else
	252	/* Unfortunately, we can't get an unaligned access trap for the sub-word
	253	write, so we have to do a general unaligned operation. */
	254
4fb9bccb	255	#define __put_user_16(x, addr) \
1da177e4 LT	256	{ \
	257	long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4; \
	258	__asm__ __volatile__( \
	259	"1: ldq_u %2,1(%5)\n" \
	260	"2: ldq_u %1,0(%5)\n" \
	261	" inswh %6,%5,%4\n" \
	262	" inswl %6,%5,%3\n" \
	263	" mskwh %2,%5,%2\n" \
	264	" mskwl %1,%5,%1\n" \
	265	" or %2,%4,%2\n" \
	266	" or %1,%3,%1\n" \
	267	"3: stq_u %2,1(%5)\n" \
	268	"4: stq_u %1,0(%5)\n" \
	269	"5:\n" \
ca282f69 AV	270	EXC(1b,5b,$31,%0) \
	271	EXC(2b,5b,$31,%0) \
	272	EXC(3b,5b,$31,%0) \
	273	EXC(4b,5b,$31,%0) \
4fb9bccb MT	274	: "=r"(__pu_err), "=&r"(__pu_tmp1), \
4fb9bccb MT	275	"=&r"(__pu_tmp2), "=&r"(__pu_tmp3), \
1da177e4 LT	276	"=&r"(__pu_tmp4) \
	277	: "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \
	278	}
	279
4fb9bccb	280	#define __put_user_8(x, addr) \
1da177e4 LT	281	{ \
	282	long __pu_tmp1, __pu_tmp2; \
	283	__asm__ __volatile__( \
	284	"1: ldq_u %1,0(%4)\n" \
	285	" insbl %3,%4,%2\n" \
	286	" mskbl %1,%4,%1\n" \
	287	" or %1,%2,%1\n" \
	288	"2: stq_u %1,0(%4)\n" \
	289	"3:\n" \
ca282f69 AV	290	EXC(1b,3b,$31,%0) \
ca282f69 AV	291	EXC(2b,3b,$31,%0) \
4fb9bccb	292	: "=r"(__pu_err), \
1da177e4 LT	293	"=&r"(__pu_tmp1), "=&r"(__pu_tmp2) \
	294	: "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \
	295	}
	296	#endif
	297
	298
	299	/*
	300	* Complex access routines
	301	*/
	302
85250231	303	extern long __copy_user(void to, const void from, long len);
1da177e4	304
ec022681 AV	305	static inline unsigned long
ec022681 AV	306	raw_copy_from_user(void to, const void __user from, unsigned long len)
1da177e4	307	{
ec022681	308	return __copy_user(to, (__force const void *)from, len);
1da177e4 LT	309	}
1da177e4 LT	310
ec022681 AV	311	static inline unsigned long
ec022681 AV	312	raw_copy_to_user(void __user to, const void from, unsigned long len)
1da177e4	313	{
ec022681	314	return __copy_user((__force void *)to, from, len);
1da177e4 LT	315	}
1da177e4 LT	316
85250231	317	extern long __clear_user(void __user *to, long len);
1da177e4 LT	318
	319	extern inline long
	320	clear_user(void __user *to, long len)
	321	{
c9df6025	322	if (__access_ok((unsigned long)to, len))
1da177e4 LT	323	len = __clear_user(to, len);
	324	return len;
	325	}
	326
f2db633d	327	#define user_addr_max() \
db68ce10	328	(uaccess_kernel() ? ~0UL : TASK_SIZE)
1da177e4	329
f2db633d	330	extern long strncpy_from_user(char dest, const char __user src, long count);
f2db633d	331	extern __must_check long strnlen_user(const char __user *str, long n);
1da177e4	332
b5478c1b	333	#include <asm/extable.h>
1da177e4 LT	334
1da177e4 LT	335	#endif /* __ALPHA_UACCESS_H */