[net-next-2.6.git] / arch / arm / include / asm / uaccess.h

/*
 *  arch/arm/include/asm/uaccess.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _ASMARM_UACCESS_H
#define _ASMARM_UACCESS_H

/*
 * User space memory access functions
 */
#include <linux/string.h>
#include <linux/thread_info.h>
#include <asm/errno.h>
#include <asm/memory.h>
#include <asm/domain.h>
#include <asm/system.h>
#include <asm/unified.h>

#define VERIFY_READ 0
#define VERIFY_WRITE 1

/*
 * 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 fixup_exception(struct pt_regs *regs);

/*
 * These two are intentionally not defined anywhere - if the kernel
 * code generates any references to them, that's a bug.
 */
extern int __get_user_bad(void);
extern int __put_user_bad(void);

/*
 * Note that this is actually 0x1,0000,0000
 */
#define KERNEL_DS	0x00000000
#define get_ds()	(KERNEL_DS)

#ifdef CONFIG_MMU

#define USER_DS		TASK_SIZE
#define get_fs()	(current_thread_info()->addr_limit)

static inline void set_fs(mm_segment_t fs)
{
	current_thread_info()->addr_limit = fs;
	modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
}

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

#define __addr_ok(addr) ({ \
	unsigned long flag; \
	__asm__("cmp %2, %0; movlo %0, #0" \
		: "=&r" (flag) \
		: "0" (current_thread_info()->addr_limit), "r" (addr) \
		: "cc"); \
	(flag == 0); })

/* We use 33-bit arithmetic here... */
#define __range_ok(addr,size) ({ \
	unsigned long flag, roksum; \
	__chk_user_ptr(addr);	\
	__asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
		: "=&r" (flag), "=&r" (roksum) \
		: "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
		: "cc"); \
	flag; })

/*
 * Single-value transfer routines.  They automatically use the right
 * size if we just have the right pointer type.  Note that the functions
 * which read from user space (*get_*) need to take care not to leak
 * kernel data even if the calling code is buggy and fails to check
 * the return value.  This means zeroing out the destination variable
 * or buffer on error.  Normally this is done out of line by the
 * fixup code, but there are a few places where it intrudes on the
 * main code path.  When we only write to user space, there is no
 * problem.
 */
extern int __get_user_1(void *);
extern int __get_user_2(void *);
extern int __get_user_4(void *);

#define __get_user_x(__r2,__p,__e,__s,__i...)				\
	   __asm__ __volatile__ (					\
		__asmeq("%0", "r0") __asmeq("%1", "r2")			\
		"bl	__get_user_" #__s				\
		: "=&r" (__e), "=r" (__r2)				\
		: "0" (__p)						\
		: __i, "cc")

#define get_user(x,p)							\
	({								\
		register const typeof(*(p)) __user *__p asm("r0") = (p);\
		register unsigned long __r2 asm("r2");			\
		register int __e asm("r0");				\
		switch (sizeof(*(__p))) {				\
		case 1:							\
			__get_user_x(__r2, __p, __e, 1, "lr");		\
	       		break;						\
		case 2:							\
			__get_user_x(__r2, __p, __e, 2, "r3", "lr");	\
			break;						\
		case 4:							\
	       		__get_user_x(__r2, __p, __e, 4, "lr");		\
			break;						\
		default: __e = __get_user_bad(); break;			\
		}							\
		x = (typeof(*(p))) __r2;				\
		__e;							\
	})

extern int __put_user_1(void *, unsigned int);
extern int __put_user_2(void *, unsigned int);
extern int __put_user_4(void *, unsigned int);
extern int __put_user_8(void *, unsigned long long);

#define __put_user_x(__r2,__p,__e,__s)					\
	   __asm__ __volatile__ (					\
		__asmeq("%0", "r0") __asmeq("%2", "r2")			\
		"bl	__put_user_" #__s				\
		: "=&r" (__e)						\
		: "0" (__p), "r" (__r2)					\
		: "ip", "lr", "cc")

#define put_user(x,p)							\
	({								\
		register const typeof(*(p)) __r2 asm("r2") = (x);	\
		register const typeof(*(p)) __user *__p asm("r0") = (p);\
		register int __e asm("r0");				\
		switch (sizeof(*(__p))) {				\
		case 1:							\
			__put_user_x(__r2, __p, __e, 1);		\
			break;						\
		case 2:							\
			__put_user_x(__r2, __p, __e, 2);		\
			break;						\
		case 4:							\
			__put_user_x(__r2, __p, __e, 4);		\
			break;						\
		case 8:							\
			__put_user_x(__r2, __p, __e, 8);		\
			break;						\
		default: __e = __put_user_bad(); break;			\
		}							\
		__e;							\
	})

#else /* CONFIG_MMU */

/*
 * uClinux has only one addr space, so has simplified address limits.
 */
#define USER_DS			KERNEL_DS

#define segment_eq(a,b)		(1)
#define __addr_ok(addr)		(1)
#define __range_ok(addr,size)	(0)
#define get_fs()		(KERNEL_DS)

static inline void set_fs(mm_segment_t fs)
{
}

#define get_user(x,p)	__get_user(x,p)
#define put_user(x,p)	__put_user(x,p)

#endif /* CONFIG_MMU */

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

/*
 * The "__xxx" versions of the user access functions do not verify the
 * address space - it must have been done previously with a separate
 * "access_ok()" call.
 *
 * The "xxx_error" versions set the third argument to EFAULT if an
 * error occurs, and leave it unchanged on success.  Note that these
 * versions are void (ie, don't return a value as such).
 */
#define __get_user(x,ptr)						\
({									\
	long __gu_err = 0;						\
	__get_user_err((x),(ptr),__gu_err);				\
	__gu_err;							\
})

#define __get_user_error(x,ptr,err)					\
({									\
	__get_user_err((x),(ptr),err);					\
	(void) 0;							\
})

#define __get_user_err(x,ptr,err)					\
do {									\
	unsigned long __gu_addr = (unsigned long)(ptr);			\
	unsigned long __gu_val;						\
	__chk_user_ptr(ptr);						\
	switch (sizeof(*(ptr))) {					\
	case 1:	__get_user_asm_byte(__gu_val,__gu_addr,err);	break;	\
	case 2:	__get_user_asm_half(__gu_val,__gu_addr,err);	break;	\
	case 4:	__get_user_asm_word(__gu_val,__gu_addr,err);	break;	\
	default: (__gu_val) = __get_user_bad();				\
	}								\
	(x) = (__typeof__(*(ptr)))__gu_val;				\
} while (0)

#define __get_user_asm_byte(x,addr,err)				\
	__asm__ __volatile__(					\
	"1:	ldrbt	%1,[%2]\n"				\
	"2:\n"							\
	"	.pushsection .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	mov	%1, #0\n"				\
	"	b	2b\n"					\
	"	.popsection\n"					\
	"	.pushsection __ex_table,\"a\"\n"		\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.popsection"					\
	: "+r" (err), "=&r" (x)					\
	: "r" (addr), "i" (-EFAULT)				\
	: "cc")

#ifndef __ARMEB__
#define __get_user_asm_half(x,__gu_addr,err)			\
({								\
	unsigned long __b1, __b2;				\
	__get_user_asm_byte(__b1, __gu_addr, err);		\
	__get_user_asm_byte(__b2, __gu_addr + 1, err);		\
	(x) = __b1 | (__b2 << 8);				\
})
#else
#define __get_user_asm_half(x,__gu_addr,err)			\
({								\
	unsigned long __b1, __b2;				\
	__get_user_asm_byte(__b1, __gu_addr, err);		\
	__get_user_asm_byte(__b2, __gu_addr + 1, err);		\
	(x) = (__b1 << 8) | __b2;				\
})
#endif

#define __get_user_asm_word(x,addr,err)				\
	__asm__ __volatile__(					\
	"1:	ldrt	%1,[%2]\n"				\
	"2:\n"							\
	"	.pushsection .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	mov	%1, #0\n"				\
	"	b	2b\n"					\
	"	.popsection\n"					\
	"	.pushsection __ex_table,\"a\"\n"		\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.popsection"					\
	: "+r" (err), "=&r" (x)					\
	: "r" (addr), "i" (-EFAULT)				\
	: "cc")

#define __put_user(x,ptr)						\
({									\
	long __pu_err = 0;						\
	__put_user_err((x),(ptr),__pu_err);				\
	__pu_err;							\
})

#define __put_user_error(x,ptr,err)					\
({									\
	__put_user_err((x),(ptr),err);					\
	(void) 0;							\
})

#define __put_user_err(x,ptr,err)					\
do {									\
	unsigned long __pu_addr = (unsigned long)(ptr);			\
	__typeof__(*(ptr)) __pu_val = (x);				\
	__chk_user_ptr(ptr);						\
	switch (sizeof(*(ptr))) {					\
	case 1: __put_user_asm_byte(__pu_val,__pu_addr,err);	break;	\
	case 2: __put_user_asm_half(__pu_val,__pu_addr,err);	break;	\
	case 4: __put_user_asm_word(__pu_val,__pu_addr,err);	break;	\
	case 8:	__put_user_asm_dword(__pu_val,__pu_addr,err);	break;	\
	default: __put_user_bad();					\
	}								\
} while (0)

#define __put_user_asm_byte(x,__pu_addr,err)			\
	__asm__ __volatile__(					\
	"1:	strbt	%1,[%2]\n"				\
	"2:\n"							\
	"	.pushsection .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	b	2b\n"					\
	"	.popsection\n"					\
	"	.pushsection __ex_table,\"a\"\n"		\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.popsection"					\
	: "+r" (err)						\
	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)		\
	: "cc")

#ifndef __ARMEB__
#define __put_user_asm_half(x,__pu_addr,err)			\
({								\
	unsigned long __temp = (unsigned long)(x);		\
	__put_user_asm_byte(__temp, __pu_addr, err);		\
	__put_user_asm_byte(__temp >> 8, __pu_addr + 1, err);	\
})
#else
#define __put_user_asm_half(x,__pu_addr,err)			\
({								\
	unsigned long __temp = (unsigned long)(x);		\
	__put_user_asm_byte(__temp >> 8, __pu_addr, err);	\
	__put_user_asm_byte(__temp, __pu_addr + 1, err);	\
})
#endif

#define __put_user_asm_word(x,__pu_addr,err)			\
	__asm__ __volatile__(					\
	"1:	strt	%1,[%2]\n"				\
	"2:\n"							\
	"	.pushsection .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	b	2b\n"					\
	"	.popsection\n"					\
	"	.pushsection __ex_table,\"a\"\n"		\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.popsection"					\
	: "+r" (err)						\
	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)		\
	: "cc")

#ifndef __ARMEB__
#define	__reg_oper0	"%R2"
#define	__reg_oper1	"%Q2"
#else
#define	__reg_oper0	"%Q2"
#define	__reg_oper1	"%R2"
#endif

#define __put_user_asm_dword(x,__pu_addr,err)			\
	__asm__ __volatile__(					\
 ARM(	"1:	strt	" __reg_oper1 ", [%1], #4\n"	)	\
 ARM(	"2:	strt	" __reg_oper0 ", [%1]\n"	)	\
 THUMB(	"1:	strt	" __reg_oper1 ", [%1]\n"	)	\
 THUMB(	"2:	strt	" __reg_oper0 ", [%1, #4]\n"	)	\
	"3:\n"							\
	"	.pushsection .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"4:	mov	%0, %3\n"				\
	"	b	3b\n"					\
	"	.popsection\n"					\
	"	.pushsection __ex_table,\"a\"\n"		\
	"	.align	3\n"					\
	"	.long	1b, 4b\n"				\
	"	.long	2b, 4b\n"				\
	"	.popsection"					\
	: "+r" (err), "+r" (__pu_addr)				\
	: "r" (x), "i" (-EFAULT)				\
	: "cc")


#ifdef CONFIG_MMU
extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
extern unsigned long __must_check __copy_to_user_std(void __user *to, const void *from, unsigned long n);
extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n);
#else
#define __copy_from_user(to,from,n)	(memcpy(to, (void __force *)from, n), 0)
#define __copy_to_user(to,from,n)	(memcpy((void __force *)to, from, n), 0)
#define __clear_user(addr,n)		(memset((void __force *)addr, 0, n), 0)
#endif

extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count);
extern unsigned long __must_check __strnlen_user(const char __user *s, long n);

static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
{
	if (access_ok(VERIFY_READ, from, n))
		n = __copy_from_user(to, from, n);
	else /* security hole - plug it */
		memset(to, 0, n);
	return n;
}

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

#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user

static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
{
	if (access_ok(VERIFY_WRITE, to, n))
		n = __clear_user(to, n);
	return n;
}

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

#define strlen_user(s)	strnlen_user(s, ~0UL >> 1)

static inline long __must_check strnlen_user(const char __user *s, long n)
{
	unsigned long res = 0;

	if (__addr_ok(s))
		res = __strnlen_user(s, n);

	return res;
}

#endif /* _ASMARM_UACCESS_H */
Commit	Line	Data
1da177e4	1	/*
4baa9922	2	* arch/arm/include/asm/uaccess.h
1da177e4 LT	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#ifndef _ASMARM_UACCESS_H
	9	#define _ASMARM_UACCESS_H
	10
	11	/*
	12	* User space memory access functions
	13	*/
87c52578 RK	14	#include <linux/string.h>
87c52578 RK	15	#include <linux/thread_info.h>
1da177e4 LT	16	#include <asm/errno.h>
	17	#include <asm/memory.h>
	18	#include <asm/domain.h>
	19	#include <asm/system.h>
8b592783	20	#include <asm/unified.h>
1da177e4 LT	21
	22	#define VERIFY_READ 0
	23	#define VERIFY_WRITE 1
	24
	25	/*
	26	* The exception table consists of pairs of addresses: the first is the
	27	* address of an instruction that is allowed to fault, and the second is
	28	* the address at which the program should continue. No registers are
	29	* modified, so it is entirely up to the continuation code to figure out
	30	* what to do.
	31	*
	32	* All the routines below use bits of fixup code that are out of line
	33	* with the main instruction path. This means when everything is well,
	34	* we don't even have to jump over them. Further, they do not intrude
	35	* on our cache or tlb entries.
	36	*/
	37
	38	struct exception_table_entry
	39	{
	40	unsigned long insn, fixup;
	41	};
	42
	43	extern int fixup_exception(struct pt_regs *regs);
	44
9641c7cc RK	45	/*
	46	* These two are intentionally not defined anywhere - if the kernel
	47	* code generates any references to them, that's a bug.
	48	*/
	49	extern int __get_user_bad(void);
	50	extern int __put_user_bad(void);
	51
1da177e4 LT	52	/*
	53	* Note that this is actually 0x1,0000,0000
	54	*/
	55	#define KERNEL_DS 0x00000000
1da177e4	56	#define get_ds() (KERNEL_DS)
9641c7cc RK	57
	58	#ifdef CONFIG_MMU
	59
	60	#define USER_DS TASK_SIZE
1da177e4 LT	61	#define get_fs() (current_thread_info()->addr_limit)
1da177e4 LT	62
9641c7cc	63	static inline void set_fs(mm_segment_t fs)
1da177e4 LT	64	{
	65	current_thread_info()->addr_limit = fs;
	66	modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
	67	}
	68
	69	#define segment_eq(a,b) ((a) == (b))
	70
	71	#define __addr_ok(addr) ({ \
	72	unsigned long flag; \
	73	__asm__("cmp %2, %0; movlo %0, #0" \
	74	: "=&r" (flag) \
	75	: "0" (current_thread_info()->addr_limit), "r" (addr) \
	76	: "cc"); \
	77	(flag == 0); })
	78
	79	/* We use 33-bit arithmetic here... */
	80	#define __range_ok(addr,size) ({ \
16cf5b39	81	unsigned long flag, roksum; \
1da177e4 LT	82	__chk_user_ptr(addr); \
1da177e4 LT	83	__asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
16cf5b39	84	: "=&r" (flag), "=&r" (roksum) \
1da177e4 LT	85	: "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
	86	: "cc"); \
	87	flag; })
	88
1da177e4 LT	89	/*
	90	* Single-value transfer routines. They automatically use the right
	91	* size if we just have the right pointer type. Note that the functions
	92	* which read from user space (get_) need to take care not to leak
	93	* kernel data even if the calling code is buggy and fails to check
	94	* the return value. This means zeroing out the destination variable
	95	* or buffer on error. Normally this is done out of line by the
	96	* fixup code, but there are a few places where it intrudes on the
	97	* main code path. When we only write to user space, there is no
	98	* problem.
1da177e4	99	*/
1da177e4 LT	100	extern int __get_user_1(void *);
	101	extern int __get_user_2(void *);
	102	extern int __get_user_4(void *);
1da177e4 LT	103
	104	#define __get_user_x(__r2,__p,__e,__s,__i...) \
	105	__asm__ __volatile__ ( \
	106	__asmeq("%0", "r0") __asmeq("%1", "r2") \
	107	"bl __get_user_" #__s \
	108	: "=&r" (__e), "=r" (__r2) \
	109	: "0" (__p) \
	110	: __i, "cc")
	111
	112	#define get_user(x,p) \
	113	({ \
c5a69d57	114	register const typeof((p)) __user __p asm("r0") = (p);\
fc048b5b	115	register unsigned long __r2 asm("r2"); \
1da177e4 LT	116	register int __e asm("r0"); \
	117	switch (sizeof(*(__p))) { \
	118	case 1: \
	119	__get_user_x(__r2, __p, __e, 1, "lr"); \
	120	break; \
	121	case 2: \
	122	__get_user_x(__r2, __p, __e, 2, "r3", "lr"); \
	123	break; \
	124	case 4: \
	125	__get_user_x(__r2, __p, __e, 4, "lr"); \
	126	break; \
1da177e4 LT	127	default: __e = __get_user_bad(); break; \
1da177e4 LT	128	} \
d2c5b690	129	x = (typeof(*(p))) __r2; \
1da177e4 LT	130	__e; \
	131	})
	132
9641c7cc RK	133	extern int __put_user_1(void *, unsigned int);
	134	extern int __put_user_2(void *, unsigned int);
	135	extern int __put_user_4(void *, unsigned int);
	136	extern int __put_user_8(void *, unsigned long long);
	137
	138	#define __put_user_x(__r2,__p,__e,__s) \
	139	__asm__ __volatile__ ( \
	140	__asmeq("%0", "r0") __asmeq("%2", "r2") \
	141	"bl __put_user_" #__s \
	142	: "=&r" (__e) \
	143	: "0" (__p), "r" (__r2) \
	144	: "ip", "lr", "cc")
	145
	146	#define put_user(x,p) \
	147	({ \
c5a69d57 TK	148	register const typeof(*(p)) __r2 asm("r2") = (x); \
c5a69d57 TK	149	register const typeof((p)) __user __p asm("r0") = (p);\
9641c7cc RK	150	register int __e asm("r0"); \
	151	switch (sizeof(*(__p))) { \
	152	case 1: \
	153	__put_user_x(__r2, __p, __e, 1); \
	154	break; \
	155	case 2: \
	156	__put_user_x(__r2, __p, __e, 2); \
	157	break; \
	158	case 4: \
	159	__put_user_x(__r2, __p, __e, 4); \
	160	break; \
	161	case 8: \
	162	__put_user_x(__r2, __p, __e, 8); \
	163	break; \
	164	default: __e = __put_user_bad(); break; \
	165	} \
	166	__e; \
	167	})
	168
	169	#else /* CONFIG_MMU */
	170
	171	/*
	172	* uClinux has only one addr space, so has simplified address limits.
	173	*/
	174	#define USER_DS KERNEL_DS
	175
	176	#define segment_eq(a,b) (1)
	177	#define __addr_ok(addr) (1)
	178	#define __range_ok(addr,size) (0)
	179	#define get_fs() (KERNEL_DS)
	180
	181	static inline void set_fs(mm_segment_t fs)
	182	{
	183	}
	184
	185	#define get_user(x,p) __get_user(x,p)
	186	#define put_user(x,p) __put_user(x,p)
	187
	188	#endif /* CONFIG_MMU */
	189
	190	#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
	191
	192	/*
	193	* The "__xxx" versions of the user access functions do not verify the
	194	* address space - it must have been done previously with a separate
	195	* "access_ok()" call.
	196	*
	197	* The "xxx_error" versions set the third argument to EFAULT if an
	198	* error occurs, and leave it unchanged on success. Note that these
	199	* versions are void (ie, don't return a value as such).
	200	*/
1da177e4 LT	201	#define __get_user(x,ptr) \
	202	({ \
	203	long __gu_err = 0; \
	204	__get_user_err((x),(ptr),__gu_err); \
	205	__gu_err; \
	206	})
	207
	208	#define __get_user_error(x,ptr,err) \
	209	({ \
	210	__get_user_err((x),(ptr),err); \
	211	(void) 0; \
	212	})
	213
	214	#define __get_user_err(x,ptr,err) \
	215	do { \
	216	unsigned long __gu_addr = (unsigned long)(ptr); \
	217	unsigned long __gu_val; \
	218	__chk_user_ptr(ptr); \
	219	switch (sizeof(*(ptr))) { \
	220	case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
	221	case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
	222	case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
	223	default: (__gu_val) = __get_user_bad(); \
	224	} \
	225	(x) = (__typeof__(*(ptr)))__gu_val; \
	226	} while (0)
	227
	228	#define __get_user_asm_byte(x,addr,err) \
	229	__asm__ __volatile__( \
4e6a0c39	230	"1: ldrbt %1,[%2]\n" \
1da177e4	231	"2:\n" \
4260415f	232	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	233	" .align 2\n" \
	234	"3: mov %0, %3\n" \
	235	" mov %1, #0\n" \
	236	" b 2b\n" \
4260415f RK	237	" .popsection\n" \
4260415f RK	238	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	239	" .align 3\n" \
1da177e4 LT	240	" .long 1b, 3b\n" \
4260415f	241	" .popsection" \
1da177e4 LT	242	: "+r" (err), "=&r" (x) \
	243	: "r" (addr), "i" (-EFAULT) \
	244	: "cc")
	245
	246	#ifndef __ARMEB__
	247	#define __get_user_asm_half(x,__gu_addr,err) \
	248	({ \
	249	unsigned long __b1, __b2; \
	250	__get_user_asm_byte(__b1, __gu_addr, err); \
	251	__get_user_asm_byte(__b2, __gu_addr + 1, err); \
	252	(x) = __b1 \| (__b2 << 8); \
	253	})
	254	#else
	255	#define __get_user_asm_half(x,__gu_addr,err) \
	256	({ \
	257	unsigned long __b1, __b2; \
	258	__get_user_asm_byte(__b1, __gu_addr, err); \
	259	__get_user_asm_byte(__b2, __gu_addr + 1, err); \
	260	(x) = (__b1 << 8) \| __b2; \
	261	})
	262	#endif
	263
	264	#define __get_user_asm_word(x,addr,err) \
	265	__asm__ __volatile__( \
4e6a0c39	266	"1: ldrt %1,[%2]\n" \
1da177e4	267	"2:\n" \
4260415f	268	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	269	" .align 2\n" \
	270	"3: mov %0, %3\n" \
	271	" mov %1, #0\n" \
	272	" b 2b\n" \
4260415f RK	273	" .popsection\n" \
4260415f RK	274	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	275	" .align 3\n" \
1da177e4 LT	276	" .long 1b, 3b\n" \
4260415f	277	" .popsection" \
1da177e4 LT	278	: "+r" (err), "=&r" (x) \
	279	: "r" (addr), "i" (-EFAULT) \
	280	: "cc")
	281
1da177e4 LT	282	#define __put_user(x,ptr) \
	283	({ \
	284	long __pu_err = 0; \
	285	__put_user_err((x),(ptr),__pu_err); \
	286	__pu_err; \
	287	})
	288
	289	#define __put_user_error(x,ptr,err) \
	290	({ \
	291	__put_user_err((x),(ptr),err); \
	292	(void) 0; \
	293	})
	294
	295	#define __put_user_err(x,ptr,err) \
	296	do { \
	297	unsigned long __pu_addr = (unsigned long)(ptr); \
	298	__typeof__(*(ptr)) __pu_val = (x); \
	299	__chk_user_ptr(ptr); \
	300	switch (sizeof(*(ptr))) { \
	301	case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
	302	case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
	303	case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
	304	case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
	305	default: __put_user_bad(); \
	306	} \
	307	} while (0)
	308
	309	#define __put_user_asm_byte(x,__pu_addr,err) \
	310	__asm__ __volatile__( \
4e6a0c39	311	"1: strbt %1,[%2]\n" \
1da177e4	312	"2:\n" \
4260415f	313	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	314	" .align 2\n" \
	315	"3: mov %0, %3\n" \
	316	" b 2b\n" \
4260415f RK	317	" .popsection\n" \
4260415f RK	318	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	319	" .align 3\n" \
1da177e4 LT	320	" .long 1b, 3b\n" \
4260415f	321	" .popsection" \
1da177e4 LT	322	: "+r" (err) \
	323	: "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
	324	: "cc")
	325
	326	#ifndef __ARMEB__
	327	#define __put_user_asm_half(x,__pu_addr,err) \
	328	({ \
	329	unsigned long __temp = (unsigned long)(x); \
	330	__put_user_asm_byte(__temp, __pu_addr, err); \
	331	__put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
	332	})
	333	#else
	334	#define __put_user_asm_half(x,__pu_addr,err) \
	335	({ \
	336	unsigned long __temp = (unsigned long)(x); \
	337	__put_user_asm_byte(__temp >> 8, __pu_addr, err); \
	338	__put_user_asm_byte(__temp, __pu_addr + 1, err); \
	339	})
	340	#endif
	341
	342	#define __put_user_asm_word(x,__pu_addr,err) \
	343	__asm__ __volatile__( \
4e6a0c39	344	"1: strt %1,[%2]\n" \
1da177e4	345	"2:\n" \
4260415f	346	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	347	" .align 2\n" \
	348	"3: mov %0, %3\n" \
	349	" b 2b\n" \
4260415f RK	350	" .popsection\n" \
4260415f RK	351	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	352	" .align 3\n" \
1da177e4 LT	353	" .long 1b, 3b\n" \
4260415f	354	" .popsection" \
1da177e4 LT	355	: "+r" (err) \
	356	: "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
	357	: "cc")
	358
	359	#ifndef __ARMEB__
	360	#define __reg_oper0 "%R2"
	361	#define __reg_oper1 "%Q2"
	362	#else
	363	#define __reg_oper0 "%Q2"
	364	#define __reg_oper1 "%R2"
	365	#endif
	366
	367	#define __put_user_asm_dword(x,__pu_addr,err) \
	368	__asm__ __volatile__( \
8b592783 CM	369	ARM( "1: strt " __reg_oper1 ", [%1], #4\n" ) \
	370	ARM( "2: strt " __reg_oper0 ", [%1]\n" ) \
	371	THUMB( "1: strt " __reg_oper1 ", [%1]\n" ) \
	372	THUMB( "2: strt " __reg_oper0 ", [%1, #4]\n" ) \
1da177e4	373	"3:\n" \
4260415f	374	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	375	" .align 2\n" \
	376	"4: mov %0, %3\n" \
	377	" b 3b\n" \
4260415f RK	378	" .popsection\n" \
4260415f RK	379	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	380	" .align 3\n" \
	381	" .long 1b, 4b\n" \
	382	" .long 2b, 4b\n" \
4260415f	383	" .popsection" \
1da177e4 LT	384	: "+r" (err), "+r" (__pu_addr) \
	385	: "r" (x), "i" (-EFAULT) \
	386	: "cc")
	387
02fcb974	388
9641c7cc	389	#ifdef CONFIG_MMU
99573298 RK	390	extern unsigned long __must_check __copy_from_user(void to, const void __user from, unsigned long n);
99573298 RK	391	extern unsigned long __must_check __copy_to_user(void __user to, const void from, unsigned long n);
a1f98849	392	extern unsigned long __must_check __copy_to_user_std(void __user to, const void from, unsigned long n);
99573298	393	extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
a1f98849	394	extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n);
9641c7cc RK	395	#else
	396	#define __copy_from_user(to,from,n) (memcpy(to, (void __force *)from, n), 0)
	397	#define __copy_to_user(to,from,n) (memcpy((void __force *)to, from, n), 0)
	398	#define __clear_user(addr,n) (memset((void __force *)addr, 0, n), 0)
	399	#endif
	400
99573298 RK	401	extern unsigned long __must_check __strncpy_from_user(char to, const char __user from, unsigned long count);
99573298 RK	402	extern unsigned long __must_check __strnlen_user(const char __user *s, long n);
1da177e4	403
99573298	404	static inline unsigned long __must_check copy_from_user(void to, const void __user from, unsigned long n)
1da177e4 LT	405	{
1da177e4 LT	406	if (access_ok(VERIFY_READ, from, n))
02fcb974	407	n = __copy_from_user(to, from, n);
1da177e4	408	else /* security hole - plug it */
59f0cb0f	409	memset(to, 0, n);
1da177e4 LT	410	return n;
	411	}
	412
99573298	413	static inline unsigned long __must_check copy_to_user(void __user to, const void from, unsigned long n)
1da177e4 LT	414	{
1da177e4 LT	415	if (access_ok(VERIFY_WRITE, to, n))
02fcb974	416	n = __copy_to_user(to, from, n);
1da177e4 LT	417	return n;
	418	}
	419
1da177e4 LT	420	#define __copy_to_user_inatomic __copy_to_user
	421	#define __copy_from_user_inatomic __copy_from_user
	422
99573298	423	static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
1da177e4 LT	424	{
1da177e4 LT	425	if (access_ok(VERIFY_WRITE, to, n))
02fcb974	426	n = __clear_user(to, n);
1da177e4 LT	427	return n;
	428	}
	429
99573298	430	static inline long __must_check strncpy_from_user(char dst, const char __user src, long count)
1da177e4 LT	431	{
	432	long res = -EFAULT;
	433	if (access_ok(VERIFY_READ, src, 1))
02fcb974	434	res = __strncpy_from_user(dst, src, count);
1da177e4 LT	435	return res;
	436	}
	437
1da177e4 LT	438	#define strlen_user(s) strnlen_user(s, ~0UL >> 1)
1da177e4 LT	439
99573298	440	static inline long __must_check strnlen_user(const char __user *s, long n)
1da177e4 LT	441	{
	442	unsigned long res = 0;
	443
	444	if (__addr_ok(s))
02fcb974	445	res = __strnlen_user(s, n);
1da177e4 LT	446
	447	return res;
	448	}
	449
	450	#endif /* _ASMARM_UACCESS_H */