[linux-2.6-block.git] / arch / m68k / include / asm / uaccess_mm.h

#ifndef __M68K_UACCESS_H
#define __M68K_UACCESS_H

/*
 * User space memory access functions
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <asm/segment.h>

#define VERIFY_READ	0
#define VERIFY_WRITE	1

/* We let the MMU do all checking */
static inline int access_ok(int type, const void __user *addr,
			    unsigned long size)
{
	return 1;
}

/*
 * Not all varients of the 68k family support the notion of address spaces.
 * The traditional 680x0 parts do, and they use the sfc/dfc registers and
 * the "moves" instruction to access user space from kernel space. Other
 * family members like ColdFire don't support this, and only have a single
 * address space, and use the usual "move" instruction for user space access.
 *
 * Outside of this difference the user space access functions are the same.
 * So lets keep the code simple and just define in what we need to use.
 */
#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
#define	MOVES	"moves"
#else
#define	MOVES	"move"
#endif

/*
 * 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, fixup;
};

extern int __put_user_bad(void);
extern int __get_user_bad(void);

#define __put_user_asm(res, x, ptr, bwl, reg, err)	\
asm volatile ("\n"					\
	"1:	"MOVES"."#bwl"	%2,%1\n"		\
	"2:\n"						\
	"	.section .fixup,\"ax\"\n"		\
	"	.even\n"				\
	"10:	moveq.l	%3,%0\n"			\
	"	jra 2b\n"				\
	"	.previous\n"				\
	"\n"						\
	"	.section __ex_table,\"a\"\n"		\
	"	.align	4\n"				\
	"	.long	1b,10b\n"			\
	"	.long	2b,10b\n"			\
	"	.previous"				\
	: "+d" (res), "=m" (*(ptr))			\
	: #reg (x), "i" (err))

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 */

#define __put_user(x, ptr)						\
({									\
	typeof(*(ptr)) __pu_val = (x);					\
	int __pu_err = 0;						\
	__chk_user_ptr(ptr);						\
	switch (sizeof (*(ptr))) {					\
	case 1:								\
		__put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT);	\
		break;							\
	case 2:								\
		__put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT);	\
		break;							\
	case 4:								\
		__put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT);	\
		break;							\
	case 8:								\
 	    {								\
 		const void __user *__pu_ptr = (ptr);			\
		asm volatile ("\n"					\
			"1:	"MOVES".l	%2,(%1)+\n"		\
			"2:	"MOVES".l	%R2,(%1)\n"		\
			"3:\n"						\
			"	.section .fixup,\"ax\"\n"		\
			"	.even\n"				\
			"10:	movel %3,%0\n"				\
			"	jra 3b\n"				\
			"	.previous\n"				\
			"\n"						\
			"	.section __ex_table,\"a\"\n"		\
			"	.align 4\n"				\
			"	.long 1b,10b\n"				\
			"	.long 2b,10b\n"				\
			"	.long 3b,10b\n"				\
			"	.previous"				\
			: "+d" (__pu_err), "+a" (__pu_ptr)		\
			: "r" (__pu_val), "i" (-EFAULT)			\
			: "memory");					\
		break;							\
	    }								\
	default:							\
		__pu_err = __put_user_bad();				\
		break;							\
	}								\
	__pu_err;							\
})
#define put_user(x, ptr)	__put_user(x, ptr)


#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({	\
	type __gu_val;						\
	asm volatile ("\n"					\
		"1:	"MOVES"."#bwl"	%2,%1\n"		\
		"2:\n"						\
		"	.section .fixup,\"ax\"\n"		\
		"	.even\n"				\
		"10:	move.l	%3,%0\n"			\
		"	sub.l	%1,%1\n"			\
		"	jra	2b\n"				\
		"	.previous\n"				\
		"\n"						\
		"	.section __ex_table,\"a\"\n"		\
		"	.align	4\n"				\
		"	.long	1b,10b\n"			\
		"	.previous"				\
		: "+d" (res), "=&" #reg (__gu_val)		\
		: "m" (*(ptr)), "i" (err));			\
	(x) = (typeof(*(ptr)))(unsigned long)__gu_val;		\
})

#define __get_user(x, ptr)						\
({									\
	int __gu_err = 0;						\
	__chk_user_ptr(ptr);						\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		__get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT);	\
		break;							\
	case 2:								\
		__get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT);	\
		break;							\
	case 4:								\
		__get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT);	\
		break;							\
/*	case 8:	disabled because gcc-4.1 has a broken typeof		\
 	    {								\
 		const void *__gu_ptr = (ptr);				\
 		u64 __gu_val;						\
		asm volatile ("\n"					\
			"1:	"MOVES".l	(%2)+,%1\n"		\
			"2:	"MOVES".l	(%2),%R1\n"		\
			"3:\n"						\
			"	.section .fixup,\"ax\"\n"		\
			"	.even\n"				\
			"10:	move.l	%3,%0\n"			\
			"	sub.l	%1,%1\n"			\
			"	sub.l	%R1,%R1\n"			\
			"	jra	3b\n"				\
			"	.previous\n"				\
			"\n"						\
			"	.section __ex_table,\"a\"\n"		\
			"	.align	4\n"				\
			"	.long	1b,10b\n"			\
			"	.long	2b,10b\n"			\
			"	.previous"				\
			: "+d" (__gu_err), "=&r" (__gu_val),		\
			  "+a" (__gu_ptr)				\
			: "i" (-EFAULT)					\
			: "memory");					\
		(x) = (typeof(*(ptr)))__gu_val;				\
		break;							\
	    }	*/							\
	default:							\
		__gu_err = __get_user_bad();				\
		break;							\
	}								\
	__gu_err;							\
})
#define get_user(x, ptr) __get_user(x, ptr)

unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);

#define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\
	asm volatile ("\n"						\
		"1:	"MOVES"."#s1"	(%2)+,%3\n"			\
		"	move."#s1"	%3,(%1)+\n"			\
		"2:	"MOVES"."#s2"	(%2)+,%3\n"			\
		"	move."#s2"	%3,(%1)+\n"			\
		"	.ifnc	\""#s3"\",\"\"\n"			\
		"3:	"MOVES"."#s3"	(%2)+,%3\n"			\
		"	move."#s3"	%3,(%1)+\n"			\
		"	.endif\n"					\
		"4:\n"							\
		"	.section __ex_table,\"a\"\n"			\
		"	.align	4\n"					\
		"	.long	1b,10f\n"				\
		"	.long	2b,20f\n"				\
		"	.ifnc	\""#s3"\",\"\"\n"			\
		"	.long	3b,30f\n"				\
		"	.endif\n"					\
		"	.previous\n"					\
		"\n"							\
		"	.section .fixup,\"ax\"\n"			\
		"	.even\n"					\
		"10:	clr."#s1"	(%1)+\n"			\
		"20:	clr."#s2"	(%1)+\n"			\
		"	.ifnc	\""#s3"\",\"\"\n"			\
		"30:	clr."#s3"	(%1)+\n"			\
		"	.endif\n"					\
		"	moveq.l	#"#n",%0\n"				\
		"	jra	4b\n"					\
		"	.previous\n"					\
		: "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp)	\
		: : "memory")

static __always_inline unsigned long
__constant_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	unsigned long res = 0, tmp;

	switch (n) {
	case 1:
		__get_user_asm(res, *(u8 *)to, (u8 __user *)from, u8, b, d, 1);
		break;
	case 2:
		__get_user_asm(res, *(u16 *)to, (u16 __user *)from, u16, w, r, 2);
		break;
	case 3:
		__constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,);
		break;
	case 4:
		__get_user_asm(res, *(u32 *)to, (u32 __user *)from, u32, l, r, 4);
		break;
	case 5:
		__constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,);
		break;
	case 6:
		__constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,);
		break;
	case 7:
		__constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b);
		break;
	case 8:
		__constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,);
		break;
	case 9:
		__constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b);
		break;
	case 10:
		__constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w);
		break;
	case 12:
		__constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l);
		break;
	default:
		/* we limit the inlined version to 3 moves */
		return __generic_copy_from_user(to, from, n);
	}

	return res;
}

#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3)	\
	asm volatile ("\n"						\
		"	move."#s1"	(%2)+,%3\n"			\
		"11:	"MOVES"."#s1"	%3,(%1)+\n"			\
		"12:	move."#s2"	(%2)+,%3\n"			\
		"21:	"MOVES"."#s2"	%3,(%1)+\n"			\
		"22:\n"							\
		"	.ifnc	\""#s3"\",\"\"\n"			\
		"	move."#s3"	(%2)+,%3\n"			\
		"31:	"MOVES"."#s3"	%3,(%1)+\n"			\
		"32:\n"							\
		"	.endif\n"					\
		"4:\n"							\
		"\n"							\
		"	.section __ex_table,\"a\"\n"			\
		"	.align	4\n"					\
		"	.long	11b,5f\n"				\
		"	.long	12b,5f\n"				\
		"	.long	21b,5f\n"				\
		"	.long	22b,5f\n"				\
		"	.ifnc	\""#s3"\",\"\"\n"			\
		"	.long	31b,5f\n"				\
		"	.long	32b,5f\n"				\
		"	.endif\n"					\
		"	.previous\n"					\
		"\n"							\
		"	.section .fixup,\"ax\"\n"			\
		"	.even\n"					\
		"5:	moveq.l	#"#n",%0\n"				\
		"	jra	4b\n"					\
		"	.previous\n"					\
		: "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp)	\
		: : "memory")

static __always_inline unsigned long
__constant_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	unsigned long res = 0, tmp;

	switch (n) {
	case 1:
		__put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
		break;
	case 2:
		__put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2);
		break;
	case 3:
		__constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
		break;
	case 4:
		__put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
		break;
	case 5:
		__constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
		break;
	case 6:
		__constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
		break;
	case 7:
		__constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
		break;
	case 8:
		__constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
		break;
	case 9:
		__constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
		break;
	case 10:
		__constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
		break;
	case 12:
		__constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
		break;
	default:
		/* limit the inlined version to 3 moves */
		return __generic_copy_to_user(to, from, n);
	}

	return res;
}

#define __copy_from_user(to, from, n)		\
(__builtin_constant_p(n) ?			\
 __constant_copy_from_user(to, from, n) :	\
 __generic_copy_from_user(to, from, n))

#define __copy_to_user(to, from, n)		\
(__builtin_constant_p(n) ?			\
 __constant_copy_to_user(to, from, n) :		\
 __generic_copy_to_user(to, from, n))

#define __copy_to_user_inatomic		__copy_to_user
#define __copy_from_user_inatomic	__copy_from_user

#define copy_from_user(to, from, n)	__copy_from_user(to, from, n)
#define copy_to_user(to, from, n)	__copy_to_user(to, from, n)

#define user_addr_max() \
	(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)

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);

unsigned long __clear_user(void __user *to, unsigned long n);

#define clear_user	__clear_user

#endif /* _M68K_UACCESS_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __M68K_UACCESS_H
	2	#define __M68K_UACCESS_H
	3
	4	/*
	5	* User space memory access functions
	6	*/
d94af931	7	#include <linux/compiler.h>
1da177e4	8	#include <linux/errno.h>
d94af931	9	#include <linux/types.h>
a0f7b67a	10	#include <linux/sched.h>
1da177e4 LT	11	#include <asm/segment.h>
	12
	13	#define VERIFY_READ 0
	14	#define VERIFY_WRITE 1
	15
	16	/* We let the MMU do all checking */
70f9cac5 GU	17	static inline int access_ok(int type, const void __user *addr,
	18	unsigned long size)
	19	{
	20	return 1;
	21	}
1da177e4	22
e08d703c GU	23	/*
	24	* Not all varients of the 68k family support the notion of address spaces.
	25	* The traditional 680x0 parts do, and they use the sfc/dfc registers and
	26	* the "moves" instruction to access user space from kernel space. Other
	27	* family members like ColdFire don't support this, and only have a single
	28	* address space, and use the usual "move" instruction for user space access.
	29	*
	30	* Outside of this difference the user space access functions are the same.
	31	* So lets keep the code simple and just define in what we need to use.
	32	*/
	33	#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
	34	#define MOVES "moves"
	35	#else
	36	#define MOVES "move"
	37	#endif
	38
1da177e4 LT	39	/*
	40	* The exception table consists of pairs of addresses: the first is the
	41	* address of an instruction that is allowed to fault, and the second is
	42	* the address at which the program should continue. No registers are
	43	* modified, so it is entirely up to the continuation code to figure out
	44	* what to do.
	45	*
	46	* All the routines below use bits of fixup code that are out of line
	47	* with the main instruction path. This means when everything is well,
	48	* we don't even have to jump over them. Further, they do not intrude
	49	* on our cache or tlb entries.
	50	*/
	51
	52	struct exception_table_entry
	53	{
	54	unsigned long insn, fixup;
	55	};
	56
d94af931 RZ	57	extern int __put_user_bad(void);
	58	extern int __get_user_bad(void);
	59
	60	#define __put_user_asm(res, x, ptr, bwl, reg, err) \
	61	asm volatile ("\n" \
e08d703c	62	"1: "MOVES"."#bwl" %2,%1\n" \
d94af931 RZ	63	"2:\n" \
	64	" .section .fixup,\"ax\"\n" \
	65	" .even\n" \
	66	"10: moveq.l %3,%0\n" \
	67	" jra 2b\n" \
	68	" .previous\n" \
	69	"\n" \
	70	" .section __ex_table,\"a\"\n" \
	71	" .align 4\n" \
	72	" .long 1b,10b\n" \
	73	" .long 2b,10b\n" \
	74	" .previous" \
	75	: "+d" (res), "=m" (*(ptr)) \
	76	: #reg (x), "i" (err))
1da177e4 LT	77
	78	/*
	79	* These are the main single-value transfer routines. They automatically
	80	* use the right size if we just have the right pointer type.
	81	*/
	82
d94af931 RZ	83	#define __put_user(x, ptr) \
	84	({ \
	85	typeof(*(ptr)) __pu_val = (x); \
	86	int __pu_err = 0; \
	87	__chk_user_ptr(ptr); \
	88	switch (sizeof (*(ptr))) { \
	89	case 1: \
	90	__put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
	91	break; \
	92	case 2: \
631d8b67	93	__put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \
d94af931 RZ	94	break; \
	95	case 4: \
	96	__put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
	97	break; \
	98	case 8: \
	99	{ \
b971018b	100	const void __user *__pu_ptr = (ptr); \
d94af931	101	asm volatile ("\n" \
e08d703c GU	102	"1: "MOVES".l %2,(%1)+\n" \
e08d703c GU	103	"2: "MOVES".l %R2,(%1)\n" \
d94af931 RZ	104	"3:\n" \
	105	" .section .fixup,\"ax\"\n" \
	106	" .even\n" \
	107	"10: movel %3,%0\n" \
	108	" jra 3b\n" \
	109	" .previous\n" \
	110	"\n" \
	111	" .section __ex_table,\"a\"\n" \
	112	" .align 4\n" \
	113	" .long 1b,10b\n" \
	114	" .long 2b,10b\n" \
	115	" .long 3b,10b\n" \
	116	" .previous" \
	117	: "+d" (__pu_err), "+a" (__pu_ptr) \
	118	: "r" (__pu_val), "i" (-EFAULT) \
	119	: "memory"); \
	120	break; \
	121	} \
	122	default: \
	123	__pu_err = __put_user_bad(); \
	124	break; \
	125	} \
	126	__pu_err; \
1da177e4	127	})
d94af931	128	#define put_user(x, ptr) __put_user(x, ptr)
1da177e4	129
1da177e4	130
d94af931 RZ	131	#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \
	132	type __gu_val; \
	133	asm volatile ("\n" \
e08d703c	134	"1: "MOVES"."#bwl" %2,%1\n" \
d94af931 RZ	135	"2:\n" \
	136	" .section .fixup,\"ax\"\n" \
	137	" .even\n" \
	138	"10: move.l %3,%0\n" \
e08d703c	139	" sub.l %1,%1\n" \
d94af931 RZ	140	" jra 2b\n" \
	141	" .previous\n" \
	142	"\n" \
	143	" .section __ex_table,\"a\"\n" \
	144	" .align 4\n" \
	145	" .long 1b,10b\n" \
	146	" .previous" \
	147	: "+d" (res), "=&" #reg (__gu_val) \
	148	: "m" (*(ptr)), "i" (err)); \
b971018b	149	(x) = (typeof(*(ptr)))(unsigned long)__gu_val; \
1da177e4	150	})
1da177e4	151
d94af931 RZ	152	#define __get_user(x, ptr) \
	153	({ \
	154	int __gu_err = 0; \
	155	__chk_user_ptr(ptr); \
	156	switch (sizeof(*(ptr))) { \
	157	case 1: \
	158	__get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \
	159	break; \
	160	case 2: \
631d8b67	161	__get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \
d94af931 RZ	162	break; \
	163	case 4: \
	164	__get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \
	165	break; \
	166	/* case 8: disabled because gcc-4.1 has a broken typeof \
	167	{ \
	168	const void *__gu_ptr = (ptr); \
	169	u64 __gu_val; \
	170	asm volatile ("\n" \
e08d703c GU	171	"1: "MOVES".l (%2)+,%1\n" \
e08d703c GU	172	"2: "MOVES".l (%2),%R1\n" \
d94af931 RZ	173	"3:\n" \
	174	" .section .fixup,\"ax\"\n" \
	175	" .even\n" \
	176	"10: move.l %3,%0\n" \
	177	" sub.l %1,%1\n" \
	178	" sub.l %R1,%R1\n" \
	179	" jra 3b\n" \
	180	" .previous\n" \
	181	"\n" \
	182	" .section __ex_table,\"a\"\n" \
	183	" .align 4\n" \
	184	" .long 1b,10b\n" \
	185	" .long 2b,10b\n" \
	186	" .previous" \
	187	: "+d" (__gu_err), "=&r" (__gu_val), \
	188	"+a" (__gu_ptr) \
	189	: "i" (-EFAULT) \
	190	: "memory"); \
	191	(x) = (typeof(*(ptr)))__gu_val; \
	192	break; \
	193	} */ \
	194	default: \
	195	__gu_err = __get_user_bad(); \
	196	break; \
	197	} \
	198	__gu_err; \
	199	})
	200	#define get_user(x, ptr) __get_user(x, ptr)
1da177e4	201
d94af931 RZ	202	unsigned long __generic_copy_from_user(void to, const void __user from, unsigned long n);
d94af931 RZ	203	unsigned long __generic_copy_to_user(void __user to, const void from, unsigned long n);
1da177e4	204
53617825 RZ	205	#define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\
53617825 RZ	206	asm volatile ("\n" \
e08d703c	207	"1: "MOVES"."#s1" (%2)+,%3\n" \
53617825	208	" move."#s1" %3,(%1)+\n" \
e08d703c	209	"2: "MOVES"."#s2" (%2)+,%3\n" \
53617825 RZ	210	" move."#s2" %3,(%1)+\n" \
53617825 RZ	211	" .ifnc \""#s3"\",\"\"\n" \
e08d703c	212	"3: "MOVES"."#s3" (%2)+,%3\n" \
53617825 RZ	213	" move."#s3" %3,(%1)+\n" \
	214	" .endif\n" \
	215	"4:\n" \
	216	" .section __ex_table,\"a\"\n" \
	217	" .align 4\n" \
	218	" .long 1b,10f\n" \
	219	" .long 2b,20f\n" \
	220	" .ifnc \""#s3"\",\"\"\n" \
	221	" .long 3b,30f\n" \
	222	" .endif\n" \
	223	" .previous\n" \
	224	"\n" \
	225	" .section .fixup,\"ax\"\n" \
	226	" .even\n" \
	227	"10: clr."#s1" (%1)+\n" \
	228	"20: clr."#s2" (%1)+\n" \
	229	" .ifnc \""#s3"\",\"\"\n" \
	230	"30: clr."#s3" (%1)+\n" \
	231	" .endif\n" \
	232	" moveq.l #"#n",%0\n" \
	233	" jra 4b\n" \
	234	" .previous\n" \
	235	: "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \
	236	: : "memory")
	237
d94af931 RZ	238	static __always_inline unsigned long
d94af931 RZ	239	__constant_copy_from_user(void to, const void __user from, unsigned long n)
1da177e4	240	{
d94af931	241	unsigned long res = 0, tmp;
1da177e4	242
d94af931	243	switch (n) {
1da177e4	244	case 1:
b971018b	245	__get_user_asm(res, (u8 )to, (u8 __user *)from, u8, b, d, 1);
53617825	246	break;
1da177e4	247	case 2:
631d8b67	248	__get_user_asm(res, (u16 )to, (u16 __user *)from, u16, w, r, 2);
53617825 RZ	249	break;
	250	case 3:
	251	__constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,);
	252	break;
d94af931	253	case 4:
b971018b	254	__get_user_asm(res, (u32 )to, (u32 __user *)from, u32, l, r, 4);
53617825 RZ	255	break;
	256	case 5:
	257	__constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,);
	258	break;
	259	case 6:
	260	__constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,);
	261	break;
	262	case 7:
	263	__constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b);
	264	break;
	265	case 8:
	266	__constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,);
	267	break;
	268	case 9:
	269	__constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b);
	270	break;
	271	case 10:
	272	__constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w);
	273	break;
	274	case 12:
	275	__constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l);
	276	break;
	277	default:
	278	/* we limit the inlined version to 3 moves */
	279	return __generic_copy_from_user(to, from, n);
1da177e4	280	}
1da177e4	281
d94af931 RZ	282	return res;
d94af931 RZ	283	}
1da177e4	284
53617825 RZ	285	#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \
	286	asm volatile ("\n" \
	287	" move."#s1" (%2)+,%3\n" \
e08d703c	288	"11: "MOVES"."#s1" %3,(%1)+\n" \
53617825	289	"12: move."#s2" (%2)+,%3\n" \
e08d703c	290	"21: "MOVES"."#s2" %3,(%1)+\n" \
53617825 RZ	291	"22:\n" \
	292	" .ifnc \""#s3"\",\"\"\n" \
	293	" move."#s3" (%2)+,%3\n" \
e08d703c	294	"31: "MOVES"."#s3" %3,(%1)+\n" \
53617825 RZ	295	"32:\n" \
	296	" .endif\n" \
	297	"4:\n" \
	298	"\n" \
	299	" .section __ex_table,\"a\"\n" \
	300	" .align 4\n" \
	301	" .long 11b,5f\n" \
	302	" .long 12b,5f\n" \
	303	" .long 21b,5f\n" \
	304	" .long 22b,5f\n" \
	305	" .ifnc \""#s3"\",\"\"\n" \
	306	" .long 31b,5f\n" \
	307	" .long 32b,5f\n" \
	308	" .endif\n" \
	309	" .previous\n" \
	310	"\n" \
	311	" .section .fixup,\"ax\"\n" \
	312	" .even\n" \
	313	"5: moveq.l #"#n",%0\n" \
	314	" jra 4b\n" \
	315	" .previous\n" \
	316	: "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \
	317	: : "memory")
	318
d94af931	319	static __always_inline unsigned long
11c40f8a	320	__constant_copy_to_user(void __user to, const void from, unsigned long n)
1da177e4	321	{
d94af931 RZ	322	unsigned long res = 0, tmp;
d94af931 RZ	323
d94af931	324	switch (n) {
1da177e4	325	case 1:
b971018b	326	__put_user_asm(res, (u8 )from, (u8 __user *)to, b, d, 1);
53617825	327	break;
1da177e4	328	case 2:
631d8b67	329	__put_user_asm(res, (u16 )from, (u16 __user *)to, w, r, 2);
53617825 RZ	330	break;
	331	case 3:
	332	__constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
	333	break;
d94af931	334	case 4:
b971018b	335	__put_user_asm(res, (u32 )from, (u32 __user *)to, l, r, 4);
53617825 RZ	336	break;
	337	case 5:
	338	__constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
	339	break;
	340	case 6:
	341	__constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
	342	break;
	343	case 7:
	344	__constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
	345	break;
	346	case 8:
	347	__constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
	348	break;
	349	case 9:
	350	__constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
	351	break;
	352	case 10:
	353	__constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
	354	break;
	355	case 12:
	356	__constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
	357	break;
	358	default:
	359	/* limit the inlined version to 3 moves */
	360	return __generic_copy_to_user(to, from, n);
1da177e4	361	}
d94af931	362
d94af931	363	return res;
1da177e4 LT	364	}
1da177e4 LT	365
d94af931	366	#define __copy_from_user(to, from, n) \
1da177e4 LT	367	(__builtin_constant_p(n) ? \
	368	__constant_copy_from_user(to, from, n) : \
	369	__generic_copy_from_user(to, from, n))
	370
d94af931	371	#define __copy_to_user(to, from, n) \
1da177e4 LT	372	(__builtin_constant_p(n) ? \
	373	__constant_copy_to_user(to, from, n) : \
	374	__generic_copy_to_user(to, from, n))
	375
d94af931 RZ	376	#define __copy_to_user_inatomic __copy_to_user
d94af931 RZ	377	#define __copy_from_user_inatomic __copy_from_user
1da177e4	378
d94af931 RZ	379	#define copy_from_user(to, from, n) __copy_from_user(to, from, n)
d94af931 RZ	380	#define copy_to_user(to, from, n) __copy_to_user(to, from, n)
1da177e4	381
d8ce7263 GU	382	#define user_addr_max() \
	383	(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
	384
	385	extern long strncpy_from_user(char dst, const char __user src, long count);
	386	extern __must_check long strlen_user(const char __user *str);
	387	extern __must_check long strnlen_user(const char __user *str, long n);
	388
3c46bdca GU	389	unsigned long __clear_user(void __user *to, unsigned long n);
	390
	391	#define clear_user __clear_user
1da177e4	392
1da177e4	393	#endif /* _M68K_UACCESS_H */