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

/*
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _ASM_MICROBLAZE_UACCESS_H
#define _ASM_MICROBLAZE_UACCESS_H

#include <linux/kernel.h>
#include <linux/mm.h>

#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <linux/string.h>

/*
 * On Microblaze the fs value is actually the top of the corresponding
 * address space.
 *
 * 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.
 *
 * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
 */
# define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })

#  ifndef CONFIG_MMU
#  define KERNEL_DS	MAKE_MM_SEG(0)
#  define USER_DS	KERNEL_DS
#  else
#  define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
#  define USER_DS	MAKE_MM_SEG(TASK_SIZE - 1)
#  endif

# define get_ds()	(KERNEL_DS)
# define get_fs()	(current_thread_info()->addr_limit)
# define set_fs(val)	(current_thread_info()->addr_limit = (val))

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

/*
 * 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;
};

#ifndef CONFIG_MMU

/* Check against bounds of physical memory */
static inline int ___range_ok(unsigned long addr, unsigned long size)
{
	return ((addr < memory_start) ||
		((addr + size - 1) > (memory_start + memory_size - 1)));
}

#define __range_ok(addr, size) \
		___range_ok((unsigned long)(addr), (unsigned long)(size))

#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)

#else

static inline int access_ok(int type, const void __user *addr,
							unsigned long size)
{
	if (!size)
		goto ok;

	if ((get_fs().seg < ((unsigned long)addr)) ||
			(get_fs().seg < ((unsigned long)addr + size - 1))) {
		pr_devel("ACCESS fail: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
			type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
			(u32)get_fs().seg);
		return 0;
	}
ok:
	pr_devel("ACCESS OK: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
			type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
			(u32)get_fs().seg);
	return 1;
}
#endif

#ifdef CONFIG_MMU
# define __FIXUP_SECTION	".section .fixup,\"ax\"\n"
# define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"
#else
# define __FIXUP_SECTION	".section .discard,\"ax\"\n"
# define __EX_TABLE_SECTION	".section .discard,\"ax\"\n"
#endif

extern unsigned long __copy_tofrom_user(void __user *to,
		const void __user *from, unsigned long size);

/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
static inline unsigned long __must_check __clear_user(void __user *to,
							unsigned long n)
{
	/* normal memset with two words to __ex_table */
	__asm__ __volatile__ (				\
			"1:	sb	r0, %1, r0;"	\
			"	addik	%0, %0, -1;"	\
			"	bneid	%0, 1b;"	\
			"	addik	%1, %1, 1;"	\
			"2:			"	\
			__EX_TABLE_SECTION		\
			".word	1b,2b;"			\
			".previous;"			\
		: "=r"(n), "=r"(to)			\
		: "0"(n), "1"(to)
	);
	return n;
}

static inline unsigned long __must_check clear_user(void __user *to,
							unsigned long n)
{
	might_fault();
	if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
		return n;

	return __clear_user(to, n);
}

/* put_user and get_user macros */
extern long __user_bad(void);

#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err)	\
({								\
	__asm__ __volatile__ (					\
			"1:"	insn	" %1, %2, r0;"		\
			"	addk	%0, r0, r0;"		\
			"2:			"		\
			__FIXUP_SECTION				\
			"3:	brid	2b;"			\
			"	addik	%0, r0, %3;"		\
			".previous;"				\
			__EX_TABLE_SECTION			\
			".word	1b,3b;"				\
			".previous;"				\
		: "=&r"(__gu_err), "=r"(__gu_val)		\
		: "r"(__gu_ptr), "i"(-EFAULT)			\
	);							\
})

/**
 * get_user: - Get a simple variable from user space.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */
#define get_user(x, ptr)						\
	__get_user_check((x), (ptr), sizeof(*(ptr)))

#define __get_user_check(x, ptr, size)					\
({									\
	unsigned long __gu_val = 0;					\
	const typeof(*(ptr)) __user *__gu_addr = (ptr);			\
	int __gu_err = 0;						\
									\
	if (access_ok(VERIFY_READ, __gu_addr, size)) {			\
		switch (size) {						\
		case 1:							\
			__get_user_asm("lbu", __gu_addr, __gu_val,	\
				       __gu_err);			\
			break;						\
		case 2:							\
			__get_user_asm("lhu", __gu_addr, __gu_val,	\
				       __gu_err);			\
			break;						\
		case 4:							\
			__get_user_asm("lw", __gu_addr, __gu_val,	\
				       __gu_err);			\
			break;						\
		default:						\
			__gu_err = __user_bad();			\
			break;						\
		}							\
	} else {							\
		__gu_err = -EFAULT;					\
	}								\
	x = (__force typeof(*(ptr)))__gu_val;				\
	__gu_err;							\
})

#define __get_user(x, ptr)						\
({									\
	unsigned long __gu_val = 0;					\
	/*unsigned long __gu_ptr = (unsigned long)(ptr);*/		\
	long __gu_err;							\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		__get_user_asm("lbu", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 2:								\
		__get_user_asm("lhu", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 4:								\
		__get_user_asm("lw", (ptr), __gu_val, __gu_err);	\
		break;							\
	default:							\
		/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
	}								\
	x = (__force __typeof__(*(ptr))) __gu_val;			\
	__gu_err;							\
})


#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err)	\
({								\
	__asm__ __volatile__ (					\
			"1:"	insn	" %1, %2, r0;"		\
			"	addk	%0, r0, r0;"		\
			"2:			"		\
			__FIXUP_SECTION				\
			"3:	brid	2b;"			\
			"	addik	%0, r0, %3;"		\
			".previous;"				\
			__EX_TABLE_SECTION			\
			".word	1b,3b;"				\
			".previous;"				\
		: "=&r"(__gu_err)				\
		: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT)	\
	);							\
})

#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err)		\
({								\
	__asm__ __volatile__ ("	lwi	%0, %1, 0;"		\
			"1:	swi	%0, %2, 0;"		\
			"	lwi	%0, %1, 4;"		\
			"2:	swi	%0, %2, 4;"		\
			"	addk	%0, r0, r0;"		\
			"3:			"		\
			__FIXUP_SECTION				\
			"4:	brid	3b;"			\
			"	addik	%0, r0, %3;"		\
			".previous;"				\
			__EX_TABLE_SECTION			\
			".word	1b,4b,2b,4b;"			\
			".previous;"				\
		: "=&r"(__gu_err)				\
		: "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT)	\
		);						\
})

/**
 * put_user: - Write a simple value into user space.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Returns zero on success, or -EFAULT on error.
 */
#define put_user(x, ptr)						\
	__put_user_check((x), (ptr), sizeof(*(ptr)))

#define __put_user_check(x, ptr, size)					\
({									\
	typeof(*(ptr)) volatile __pu_val = x;				\
	typeof(*(ptr)) __user *__pu_addr = (ptr);			\
	int __pu_err = 0;						\
									\
	if (access_ok(VERIFY_WRITE, __pu_addr, size)) {			\
		switch (size) {						\
		case 1:							\
			__put_user_asm("sb", __pu_addr, __pu_val,	\
				       __pu_err);			\
			break;						\
		case 2:							\
			__put_user_asm("sh", __pu_addr, __pu_val,	\
				       __pu_err);			\
			break;						\
		case 4:							\
			__put_user_asm("sw", __pu_addr, __pu_val,	\
				       __pu_err);			\
			break;						\
		case 8:							\
			__put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
			break;						\
		default:						\
			__pu_err = __user_bad();			\
			break;						\
		}							\
	} else {							\
		__pu_err = -EFAULT;					\
	}								\
	__pu_err;							\
})

#define __put_user(x, ptr)						\
({									\
	__typeof__(*(ptr)) volatile __gu_val = (x);			\
	long __gu_err = 0;						\
	switch (sizeof(__gu_val)) {					\
	case 1:								\
		__put_user_asm("sb", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 2:								\
		__put_user_asm("sh", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 4:								\
		__put_user_asm("sw", (ptr), __gu_val, __gu_err);	\
		break;							\
	case 8:								\
		__put_user_asm_8((ptr), __gu_val, __gu_err);		\
		break;							\
	default:							\
		/*__gu_err = -EINVAL;*/	__gu_err = __user_bad();	\
	}								\
	__gu_err;							\
})


/* copy_to_from_user */
#define __copy_from_user(to, from, n)	\
	__copy_tofrom_user((__force void __user *)(to), \
				(void __user *)(from), (n))
#define __copy_from_user_inatomic(to, from, n) \
		__copy_from_user((to), (from), (n))

static inline long copy_from_user(void *to,
		const void __user *from, unsigned long n)
{
	unsigned long res = n;
	might_fault();
	if (likely(access_ok(VERIFY_READ, from, n)))
		res = __copy_from_user(to, from, n);
	if (unlikely(res))
		memset(to + (n - res), 0, res);
	return res;
}

#define __copy_to_user(to, from, n)	\
		__copy_tofrom_user((void __user *)(to), \
			(__force const void __user *)(from), (n))
#define __copy_to_user_inatomic(to, from, n) __copy_to_user((to), (from), (n))

static inline long copy_to_user(void __user *to,
		const void *from, unsigned long n)
{
	might_fault();
	if (access_ok(VERIFY_WRITE, to, n))
		return __copy_to_user(to, from, n);
	return n;
}

/*
 * Copy a null terminated string from userspace.
 */
extern int __strncpy_user(char *to, const char __user *from, int len);

#define __strncpy_from_user	__strncpy_user

static inline long
strncpy_from_user(char *dst, const char __user *src, long count)
{
	if (!access_ok(VERIFY_READ, src, 1))
		return -EFAULT;
	return __strncpy_from_user(dst, src, count);
}

/*
 * Return the size of a string (including the ending 0)
 *
 * Return 0 on exception, a value greater than N if too long
 */
extern int __strnlen_user(const char __user *sstr, int len);

static inline long strnlen_user(const char __user *src, long n)
{
	if (!access_ok(VERIFY_READ, src, 1))
		return 0;
	return __strnlen_user(src, n);
}

#endif /* _ASM_MICROBLAZE_UACCESS_H */
Commit	Line	Data
2660663f	1	/*
0d6de953 MS	2	* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
0d6de953 MS	3	* Copyright (C) 2008-2009 PetaLogix
2660663f MS	4	* Copyright (C) 2006 Atmark Techno, Inc.
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	#ifndef _ASM_MICROBLAZE_UACCESS_H
	12	#define _ASM_MICROBLAZE_UACCESS_H
	13
2660663f	14	#include <linux/kernel.h>
2660663f MS	15	#include <linux/mm.h>
	16
	17	#include <asm/mmu.h>
	18	#include <asm/page.h>
	19	#include <asm/pgtable.h>
2660663f MS	20	#include <linux/string.h>
2660663f MS	21
40db0834 MS	22	/*
	23	* On Microblaze the fs value is actually the top of the corresponding
	24	* address space.
	25	*
	26	* The fs value determines whether argument validity checking should be
	27	* performed or not. If get_fs() == USER_DS, checking is performed, with
	28	* get_fs() == KERNEL_DS, checking is bypassed.
	29	*
	30	* For historical reasons, these macros are grossly misnamed.
	31	*
	32	* For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
	33	*/
	34	# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	35
	36	# ifndef CONFIG_MMU
	37	# define KERNEL_DS MAKE_MM_SEG(0)
	38	# define USER_DS KERNEL_DS
	39	# else
	40	# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
	41	# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
	42	# endif
	43
	44	# define get_ds() (KERNEL_DS)
	45	# define get_fs() (current_thread_info()->addr_limit)
	46	# define set_fs(val) (current_thread_info()->addr_limit = (val))
	47
	48	# define segment_eq(a, b) ((a).seg == (b).seg)
	49
357bc3c9 MS	50	/*
	51	* The exception table consists of pairs of addresses: the first is the
	52	* address of an instruction that is allowed to fault, and the second is
	53	* the address at which the program should continue. No registers are
	54	* modified, so it is entirely up to the continuation code to figure out
	55	* what to do.
	56	*
	57	* All the routines below use bits of fixup code that are out of line
	58	* with the main instruction path. This means when everything is well,
	59	* we don't even have to jump over them. Further, they do not intrude
	60	* on our cache or tlb entries.
	61	*/
	62	struct exception_table_entry {
	63	unsigned long insn, fixup;
	64	};
40db0834	65
0d6de953 MS	66	#ifndef CONFIG_MMU
0d6de953 MS	67
60a729f7 MS	68	/* Check against bounds of physical memory */
	69	static inline int ___range_ok(unsigned long addr, unsigned long size)
	70	{
	71	return ((addr < memory_start) \|\|
83a92529	72	((addr + size - 1) > (memory_start + memory_size - 1)));
60a729f7	73	}
2660663f MS	74
	75	#define __range_ok(addr, size) \
	76	___range_ok((unsigned long)(addr), (unsigned long)(size))
	77
	78	#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
40b1156d MS	79
	80	#else
	81
f663b60f MS	82	static inline int access_ok(int type, const void __user *addr,
	83	unsigned long size)
	84	{
	85	if (!size)
	86	goto ok;
	87
	88	if ((get_fs().seg < ((unsigned long)addr)) \|\|
	89	(get_fs().seg < ((unsigned long)addr + size - 1))) {
de295cf0	90	pr_devel("ACCESS fail: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
8706a6b6	91	type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
f663b60f MS	92	(u32)get_fs().seg);
	93	return 0;
	94	}
	95	ok:
de295cf0	96	pr_devel("ACCESS OK: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
8706a6b6	97	type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
f663b60f MS	98	(u32)get_fs().seg);
	99	return 1;
	100	}
40b1156d MS	101	#endif
	102
	103	#ifdef CONFIG_MMU
	104	# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
	105	# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
	106	#else
	107	# define __FIXUP_SECTION ".section .discard,\"ax\"\n"
7e278157	108	# define __EX_TABLE_SECTION ".section .discard,\"ax\"\n"
40b1156d MS	109	#endif
40b1156d MS	110
94804a9b MS	111	extern unsigned long __copy_tofrom_user(void __user *to,
	112	const void __user *from, unsigned long size);
	113
527bdb52 MS	114	/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
	115	static inline unsigned long __must_check __clear_user(void __user *to,
	116	unsigned long n)
	117	{
	118	/* normal memset with two words to __ex_table */
	119	__asm__ __volatile__ ( \
6f3946b4	120	"1: sb r0, %1, r0;" \
527bdb52 MS	121	" addik %0, %0, -1;" \
527bdb52 MS	122	" bneid %0, 1b;" \
6f3946b4	123	" addik %1, %1, 1;" \
527bdb52 MS	124	"2: " \
	125	__EX_TABLE_SECTION \
	126	".word 1b,2b;" \
	127	".previous;" \
6f3946b4 SM	128	: "=r"(n), "=r"(to) \
6f3946b4 SM	129	: "0"(n), "1"(to)
527bdb52 MS	130	);
	131	return n;
	132	}
	133
	134	static inline unsigned long __must_check clear_user(void __user *to,
	135	unsigned long n)
	136	{
ac093f8d	137	might_fault();
527bdb52 MS	138	if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
	139	return n;
	140
	141	return __clear_user(to, n);
	142	}
	143
cca79120	144	/* put_user and get_user macros */
3a6d7724 MS	145	extern long __user_bad(void);
	146
	147	#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
	148	({ \
	149	__asm__ __volatile__ ( \
	150	"1:" insn " %1, %2, r0;" \
	151	" addk %0, r0, r0;" \
	152	"2: " \
	153	__FIXUP_SECTION \
	154	"3: brid 2b;" \
	155	" addik %0, r0, %3;" \
	156	".previous;" \
	157	__EX_TABLE_SECTION \
	158	".word 1b,3b;" \
	159	".previous;" \
	160	: "=&r"(__gu_err), "=r"(__gu_val) \
	161	: "r"(__gu_ptr), "i"(-EFAULT) \
	162	); \
	163	})
	164
	165	/**
	166	* get_user: - Get a simple variable from user space.
	167	* @x: Variable to store result.
	168	* @ptr: Source address, in user space.
	169	*
b3c395ef DH	170	* Context: User context only. This function may sleep if pagefaults are
b3c395ef DH	171	* enabled.
3a6d7724 MS	172	*
	173	* This macro copies a single simple variable from user space to kernel
	174	* space. It supports simple types like char and int, but not larger
	175	* data types like structures or arrays.
	176	*
	177	* @ptr must have pointer-to-simple-variable type, and the result of
	178	* dereferencing @ptr must be assignable to @x without a cast.
	179	*
	180	* Returns zero on success, or -EFAULT on error.
	181	* On error, the variable @x is set to zero.
	182	*/
538722ca SM	183	#define get_user(x, ptr) \
	184	__get_user_check((x), (ptr), sizeof(*(ptr)))
	185
	186	#define __get_user_check(x, ptr, size) \
	187	({ \
	188	unsigned long __gu_val = 0; \
	189	const typeof((ptr)) __user __gu_addr = (ptr); \
	190	int __gu_err = 0; \
	191	\
	192	if (access_ok(VERIFY_READ, __gu_addr, size)) { \
	193	switch (size) { \
	194	case 1: \
	195	__get_user_asm("lbu", __gu_addr, __gu_val, \
	196	__gu_err); \
	197	break; \
	198	case 2: \
	199	__get_user_asm("lhu", __gu_addr, __gu_val, \
	200	__gu_err); \
	201	break; \
	202	case 4: \
	203	__get_user_asm("lw", __gu_addr, __gu_val, \
	204	__gu_err); \
	205	break; \
	206	default: \
	207	__gu_err = __user_bad(); \
	208	break; \
	209	} \
	210	} else { \
	211	__gu_err = -EFAULT; \
	212	} \
0774bf6a	213	x = (__force typeof(*(ptr)))__gu_val; \
538722ca SM	214	__gu_err; \
538722ca SM	215	})
838d2406	216
3a6d7724 MS	217	#define __get_user(x, ptr) \
3a6d7724 MS	218	({ \
e98b9e37	219	unsigned long __gu_val = 0; \
3a6d7724 MS	220	/unsigned long __gu_ptr = (unsigned long)(ptr);/ \
	221	long __gu_err; \
	222	switch (sizeof(*(ptr))) { \
	223	case 1: \
	224	__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
	225	break; \
	226	case 2: \
	227	__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
	228	break; \
	229	case 4: \
	230	__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
	231	break; \
	232	default: \
	233	/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
	234	} \
0774bf6a	235	x = (__force __typeof__(*(ptr))) __gu_val; \
3a6d7724	236	__gu_err; \
0d6de953	237	})
2660663f	238
3a6d7724	239
ef4e277b MS	240	#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
	241	({ \
	242	__asm__ __volatile__ ( \
	243	"1:" insn " %1, %2, r0;" \
	244	" addk %0, r0, r0;" \
	245	"2: " \
	246	__FIXUP_SECTION \
	247	"3: brid 2b;" \
	248	" addik %0, r0, %3;" \
	249	".previous;" \
	250	__EX_TABLE_SECTION \
	251	".word 1b,3b;" \
	252	".previous;" \
	253	: "=&r"(__gu_err) \
	254	: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
	255	); \
	256	})
2660663f	257
ef4e277b	258	#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
0d6de953	259	({ \
ef4e277b MS	260	__asm__ __volatile__ (" lwi %0, %1, 0;" \
	261	"1: swi %0, %2, 0;" \
	262	" lwi %0, %1, 4;" \
	263	"2: swi %0, %2, 4;" \
	264	" addk %0, r0, r0;" \
	265	"3: " \
	266	__FIXUP_SECTION \
	267	"4: brid 3b;" \
	268	" addik %0, r0, %3;" \
	269	".previous;" \
	270	__EX_TABLE_SECTION \
	271	".word 1b,4b,2b,4b;" \
	272	".previous;" \
	273	: "=&r"(__gu_err) \
	274	: "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
	275	); \
0d6de953	276	})
2660663f	277
cca79120 MS	278	/**
	279	* put_user: - Write a simple value into user space.
	280	* @x: Value to copy to user space.
	281	* @ptr: Destination address, in user space.
	282	*
b3c395ef DH	283	* Context: User context only. This function may sleep if pagefaults are
b3c395ef DH	284	* enabled.
cca79120 MS	285	*
	286	* This macro copies a single simple value from kernel space to user
	287	* space. It supports simple types like char and int, but not larger
	288	* data types like structures or arrays.
	289	*
	290	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	291	* to the result of dereferencing @ptr.
	292	*
	293	* Returns zero on success, or -EFAULT on error.
	294	*/
538722ca SM	295	#define put_user(x, ptr) \
	296	__put_user_check((x), (ptr), sizeof(*(ptr)))
	297
	298	#define __put_user_check(x, ptr, size) \
	299	({ \
132d5dfc	300	typeof(*(ptr)) volatile __pu_val = x; \
538722ca SM	301	typeof((ptr)) __user __pu_addr = (ptr); \
	302	int __pu_err = 0; \
	303	\
538722ca SM	304	if (access_ok(VERIFY_WRITE, __pu_addr, size)) { \
	305	switch (size) { \
	306	case 1: \
	307	__put_user_asm("sb", __pu_addr, __pu_val, \
	308	__pu_err); \
	309	break; \
	310	case 2: \
	311	__put_user_asm("sh", __pu_addr, __pu_val, \
	312	__pu_err); \
	313	break; \
	314	case 4: \
	315	__put_user_asm("sw", __pu_addr, __pu_val, \
	316	__pu_err); \
	317	break; \
	318	case 8: \
	319	__put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
	320	break; \
	321	default: \
	322	__pu_err = __user_bad(); \
	323	break; \
	324	} \
	325	} else { \
	326	__pu_err = -EFAULT; \
	327	} \
	328	__pu_err; \
	329	})
cca79120	330
ef4e277b MS	331	#define __put_user(x, ptr) \
	332	({ \
	333	__typeof__(*(ptr)) volatile __gu_val = (x); \
	334	long __gu_err = 0; \
	335	switch (sizeof(__gu_val)) { \
	336	case 1: \
	337	__put_user_asm("sb", (ptr), __gu_val, __gu_err); \
	338	break; \
	339	case 2: \
	340	__put_user_asm("sh", (ptr), __gu_val, __gu_err); \
	341	break; \
	342	case 4: \
	343	__put_user_asm("sw", (ptr), __gu_val, __gu_err); \
	344	break; \
	345	case 8: \
	346	__put_user_asm_8((ptr), __gu_val, __gu_err); \
	347	break; \
	348	default: \
	349	/__gu_err = -EINVAL;/ __gu_err = __user_bad(); \
	350	} \
	351	__gu_err; \
	352	})
2660663f	353
cca79120	354
89ae9753	355	/* copy_to_from_user */
4270690b MS	356	#define __copy_from_user(to, from, n) \
	357	__copy_tofrom_user((__force void __user *)(to), \
	358	(void __user *)(from), (n))
95dfbbe4	359	#define __copy_from_user_inatomic(to, from, n) \
8d7ec6ee	360	__copy_from_user((to), (from), (n))
0d6de953	361
4270690b MS	362	static inline long copy_from_user(void *to,
	363	const void __user *from, unsigned long n)
	364	{
d0cf3851	365	unsigned long res = n;
ac093f8d	366	might_fault();
d0cf3851 AV	367	if (likely(access_ok(VERIFY_READ, from, n)))
	368	res = __copy_from_user(to, from, n);
	369	if (unlikely(res))
	370	memset(to + (n - res), 0, res);
	371	return res;
4270690b MS	372	}
4270690b MS	373
cc5a428b	374	#define __copy_to_user(to, from, n) \
4270690b	375	__copy_tofrom_user((void __user *)(to), \
cc5a428b	376	(__force const void __user *)(from), (n))
8d7ec6ee	377	#define __copy_to_user_inatomic(to, from, n) __copy_to_user((to), (from), (n))
0d6de953	378
cc5a428b MS	379	static inline long copy_to_user(void __user *to,
	380	const void *from, unsigned long n)
	381	{
ac093f8d	382	might_fault();
cc5a428b MS	383	if (access_ok(VERIFY_WRITE, to, n))
cc5a428b MS	384	return __copy_to_user(to, from, n);
89ae9753 MS	385	return n;
	386	}
	387
	388	/*
	389	* Copy a null terminated string from userspace.
	390	*/
	391	extern int __strncpy_user(char to, const char __user from, int len);
	392
	393	#define __strncpy_from_user __strncpy_user
	394
	395	static inline long
	396	strncpy_from_user(char dst, const char __user src, long count)
	397	{
	398	if (!access_ok(VERIFY_READ, src, 1))
	399	return -EFAULT;
	400	return __strncpy_from_user(dst, src, count);
	401	}
	402
	403	/*
	404	* Return the size of a string (including the ending 0)
	405	*
	406	* Return 0 on exception, a value greater than N if too long
	407	*/
	408	extern int __strnlen_user(const char __user *sstr, int len);
	409
	410	static inline long strnlen_user(const char __user *src, long n)
	411	{
	412	if (!access_ok(VERIFY_READ, src, 1))
	413	return 0;
	414	return __strnlen_user(src, n);
cc5a428b MS	415	}
cc5a428b MS	416
2660663f	417	#endif /* _ASM_MICROBLAZE_UACCESS_H */