[deliverable/linux.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/unified.h>
#include <asm/compiler.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 __GUP_CLOBBER_1	"lr", "cc"
#ifdef CONFIG_CPU_USE_DOMAINS
#define __GUP_CLOBBER_2	"ip", "lr", "cc"
#else
#define __GUP_CLOBBER_2 "lr", "cc"
#endif
#define __GUP_CLOBBER_4	"lr", "cc"

#define __get_user_x(__r2,__p,__e,__l,__s)				\
	   __asm__ __volatile__ (					\
		__asmeq("%0", "r0") __asmeq("%1", "r2")			\
		__asmeq("%3", "r1")					\
		"bl	__get_user_" #__s				\
		: "=&r" (__e), "=r" (__r2)				\
		: "0" (__p), "r" (__l)					\
		: __GUP_CLOBBER_##__s)

#define __get_user_check(x,p)							\
	({								\
		unsigned long __limit = current_thread_info()->addr_limit - 1; \
		register const typeof(*(p)) __user *__p asm("r0") = (p);\
		register unsigned long __r2 asm("r2");			\
		register unsigned long __l asm("r1") = __limit;		\
		register int __e asm("r0");				\
		switch (sizeof(*(__p))) {				\
		case 1:							\
			__get_user_x(__r2, __p, __e, __l, 1);		\
			break;						\
		case 2:							\
			__get_user_x(__r2, __p, __e, __l, 2);		\
			break;						\
		case 4:							\
			__get_user_x(__r2, __p, __e, __l, 4);		\
			break;						\
		default: __e = __get_user_bad(); break;			\
		}							\
		x = (typeof(*(p))) __r2;				\
		__e;							\
	})

#define get_user(x,p)							\
	({								\
		might_fault();						\
		__get_user_check(x,p);					\
	 })

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,__l,__s)				\
	   __asm__ __volatile__ (					\
		__asmeq("%0", "r0") __asmeq("%2", "r2")			\
		__asmeq("%3", "r1")					\
		"bl	__put_user_" #__s				\
		: "=&r" (__e)						\
		: "0" (__p), "r" (__r2), "r" (__l)			\
		: "ip", "lr", "cc")

#define __put_user_check(x,p)							\
	({								\
		unsigned long __limit = current_thread_info()->addr_limit - 1; \
		register const typeof(*(p)) __r2 asm("r2") = (x);	\
		register const typeof(*(p)) __user *__p asm("r0") = (p);\
		register unsigned long __l asm("r1") = __limit;		\
		register int __e asm("r0");				\
		switch (sizeof(*(__p))) {				\
		case 1:							\
			__put_user_x(__r2, __p, __e, __l, 1);		\
			break;						\
		case 2:							\
			__put_user_x(__r2, __p, __e, __l, 2);		\
			break;						\
		case 4:							\
			__put_user_x(__r2, __p, __e, __l, 4);		\
			break;						\
		case 8:							\
			__put_user_x(__r2, __p, __e, __l, 8);		\
			break;						\
		default: __e = __put_user_bad(); break;			\
		}							\
		__e;							\
	})

#define put_user(x,p)							\
	({								\
		might_fault();						\
		__put_user_check(x,p);					\
	 })

#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)

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

/*
 * 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);						\
	might_fault();							\
	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:	" TUSER(ldrb) "	%1,[%2],#0\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:	" TUSER(ldr) "	%1,[%2],#0\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);						\
	might_fault();							\
	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:	" TUSER(strb) "	%1,[%2],#0\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:	" TUSER(str) "	%1,[%2],#0\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:	" TUSER(str) "	" __reg_oper1 ", [%1], #4\n"	) \
 ARM(	"2:	" TUSER(str) "	" __reg_oper0 ", [%1]\n"	) \
 THUMB(	"1:	" TUSER(str) "	" __reg_oper1 ", [%1]\n"	) \
 THUMB(	"2:	" TUSER(str) "	" __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

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;
}

extern long strncpy_from_user(char *dest, 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);

#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>
8b592783	19	#include <asm/unified.h>
9f97da78	20	#include <asm/compiler.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	103
8404663f RK	104	#define __GUP_CLOBBER_1 "lr", "cc"
	105	#ifdef CONFIG_CPU_USE_DOMAINS
	106	#define __GUP_CLOBBER_2 "ip", "lr", "cc"
	107	#else
	108	#define __GUP_CLOBBER_2 "lr", "cc"
	109	#endif
	110	#define __GUP_CLOBBER_4 "lr", "cc"
	111
	112	#define __get_user_x(__r2,__p,__e,__l,__s) \
1da177e4 LT	113	__asm__ __volatile__ ( \
1da177e4 LT	114	__asmeq("%0", "r0") __asmeq("%1", "r2") \
8404663f	115	__asmeq("%3", "r1") \
1da177e4 LT	116	"bl __get_user_" #__s \
1da177e4 LT	117	: "=&r" (__e), "=r" (__r2) \
8404663f RK	118	: "0" (__p), "r" (__l) \
8404663f RK	119	: __GUP_CLOBBER_##__s)
1da177e4	120
ad72907a	121	#define __get_user_check(x,p) \
1da177e4	122	({ \
8404663f	123	unsigned long __limit = current_thread_info()->addr_limit - 1; \
c5a69d57	124	register const typeof((p)) __user __p asm("r0") = (p);\
fc048b5b	125	register unsigned long __r2 asm("r2"); \
8404663f	126	register unsigned long __l asm("r1") = __limit; \
1da177e4 LT	127	register int __e asm("r0"); \
	128	switch (sizeof(*(__p))) { \
	129	case 1: \
8404663f RK	130	__get_user_x(__r2, __p, __e, __l, 1); \
8404663f RK	131	break; \
1da177e4	132	case 2: \
8404663f	133	__get_user_x(__r2, __p, __e, __l, 2); \
1da177e4 LT	134	break; \
1da177e4 LT	135	case 4: \
8404663f	136	__get_user_x(__r2, __p, __e, __l, 4); \
1da177e4	137	break; \
1da177e4 LT	138	default: __e = __get_user_bad(); break; \
1da177e4 LT	139	} \
d2c5b690	140	x = (typeof(*(p))) __r2; \
1da177e4 LT	141	__e; \
	142	})
	143
ad72907a WD	144	#define get_user(x,p) \
	145	({ \
	146	might_fault(); \
	147	__get_user_check(x,p); \
	148	})
	149
9641c7cc RK	150	extern int __put_user_1(void *, unsigned int);
	151	extern int __put_user_2(void *, unsigned int);
	152	extern int __put_user_4(void *, unsigned int);
	153	extern int __put_user_8(void *, unsigned long long);
	154
8404663f	155	#define __put_user_x(__r2,__p,__e,__l,__s) \
9641c7cc RK	156	__asm__ __volatile__ ( \
9641c7cc RK	157	__asmeq("%0", "r0") __asmeq("%2", "r2") \
8404663f	158	__asmeq("%3", "r1") \
9641c7cc RK	159	"bl __put_user_" #__s \
9641c7cc RK	160	: "=&r" (__e) \
8404663f	161	: "0" (__p), "r" (__r2), "r" (__l) \
9641c7cc RK	162	: "ip", "lr", "cc")
9641c7cc RK	163
ad72907a	164	#define __put_user_check(x,p) \
9641c7cc	165	({ \
8404663f	166	unsigned long __limit = current_thread_info()->addr_limit - 1; \
c5a69d57 TK	167	register const typeof(*(p)) __r2 asm("r2") = (x); \
c5a69d57 TK	168	register const typeof((p)) __user __p asm("r0") = (p);\
8404663f	169	register unsigned long __l asm("r1") = __limit; \
9641c7cc RK	170	register int __e asm("r0"); \
	171	switch (sizeof(*(__p))) { \
	172	case 1: \
8404663f	173	__put_user_x(__r2, __p, __e, __l, 1); \
9641c7cc RK	174	break; \
9641c7cc RK	175	case 2: \
8404663f	176	__put_user_x(__r2, __p, __e, __l, 2); \
9641c7cc RK	177	break; \
9641c7cc RK	178	case 4: \
8404663f	179	__put_user_x(__r2, __p, __e, __l, 4); \
9641c7cc RK	180	break; \
9641c7cc RK	181	case 8: \
8404663f	182	__put_user_x(__r2, __p, __e, __l, 8); \
9641c7cc RK	183	break; \
	184	default: __e = __put_user_bad(); break; \
	185	} \
	186	__e; \
	187	})
	188
ad72907a WD	189	#define put_user(x,p) \
	190	({ \
	191	might_fault(); \
	192	__put_user_check(x,p); \
	193	})
	194
9641c7cc RK	195	#else /* CONFIG_MMU */
	196
	197	/*
	198	* uClinux has only one addr space, so has simplified address limits.
	199	*/
	200	#define USER_DS KERNEL_DS
	201
	202	#define segment_eq(a,b) (1)
	203	#define __addr_ok(addr) (1)
	204	#define __range_ok(addr,size) (0)
	205	#define get_fs() (KERNEL_DS)
	206
	207	static inline void set_fs(mm_segment_t fs)
	208	{
	209	}
	210
	211	#define get_user(x,p) __get_user(x,p)
	212	#define put_user(x,p) __put_user(x,p)
	213
	214	#endif /* CONFIG_MMU */
	215
	216	#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
	217
8c56cc8b WD	218	#define user_addr_max() \
	219	(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
	220
9641c7cc RK	221	/*
	222	* The "__xxx" versions of the user access functions do not verify the
	223	* address space - it must have been done previously with a separate
	224	* "access_ok()" call.
	225	*
	226	* The "xxx_error" versions set the third argument to EFAULT if an
	227	* error occurs, and leave it unchanged on success. Note that these
	228	* versions are void (ie, don't return a value as such).
	229	*/
1da177e4 LT	230	#define __get_user(x,ptr) \
	231	({ \
	232	long __gu_err = 0; \
	233	__get_user_err((x),(ptr),__gu_err); \
	234	__gu_err; \
	235	})
	236
	237	#define __get_user_error(x,ptr,err) \
	238	({ \
	239	__get_user_err((x),(ptr),err); \
	240	(void) 0; \
	241	})
	242
	243	#define __get_user_err(x,ptr,err) \
	244	do { \
	245	unsigned long __gu_addr = (unsigned long)(ptr); \
	246	unsigned long __gu_val; \
	247	__chk_user_ptr(ptr); \
ad72907a	248	might_fault(); \
1da177e4 LT	249	switch (sizeof(*(ptr))) { \
	250	case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
	251	case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
	252	case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
	253	default: (__gu_val) = __get_user_bad(); \
	254	} \
	255	(x) = (__typeof__(*(ptr)))__gu_val; \
	256	} while (0)
	257
	258	#define __get_user_asm_byte(x,addr,err) \
	259	__asm__ __volatile__( \
4e7682d0	260	"1: " TUSER(ldrb) " %1,[%2],#0\n" \
1da177e4	261	"2:\n" \
4260415f	262	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	263	" .align 2\n" \
	264	"3: mov %0, %3\n" \
	265	" mov %1, #0\n" \
	266	" b 2b\n" \
4260415f RK	267	" .popsection\n" \
4260415f RK	268	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	269	" .align 3\n" \
1da177e4 LT	270	" .long 1b, 3b\n" \
4260415f	271	" .popsection" \
1da177e4 LT	272	: "+r" (err), "=&r" (x) \
	273	: "r" (addr), "i" (-EFAULT) \
	274	: "cc")
	275
	276	#ifndef __ARMEB__
	277	#define __get_user_asm_half(x,__gu_addr,err) \
	278	({ \
	279	unsigned long __b1, __b2; \
	280	__get_user_asm_byte(__b1, __gu_addr, err); \
	281	__get_user_asm_byte(__b2, __gu_addr + 1, err); \
	282	(x) = __b1 \| (__b2 << 8); \
	283	})
	284	#else
	285	#define __get_user_asm_half(x,__gu_addr,err) \
	286	({ \
	287	unsigned long __b1, __b2; \
	288	__get_user_asm_byte(__b1, __gu_addr, err); \
	289	__get_user_asm_byte(__b2, __gu_addr + 1, err); \
	290	(x) = (__b1 << 8) \| __b2; \
	291	})
	292	#endif
	293
	294	#define __get_user_asm_word(x,addr,err) \
	295	__asm__ __volatile__( \
4e7682d0	296	"1: " TUSER(ldr) " %1,[%2],#0\n" \
1da177e4	297	"2:\n" \
4260415f	298	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	299	" .align 2\n" \
	300	"3: mov %0, %3\n" \
	301	" mov %1, #0\n" \
	302	" b 2b\n" \
4260415f RK	303	" .popsection\n" \
4260415f RK	304	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	305	" .align 3\n" \
1da177e4 LT	306	" .long 1b, 3b\n" \
4260415f	307	" .popsection" \
1da177e4 LT	308	: "+r" (err), "=&r" (x) \
	309	: "r" (addr), "i" (-EFAULT) \
	310	: "cc")
	311
1da177e4 LT	312	#define __put_user(x,ptr) \
	313	({ \
	314	long __pu_err = 0; \
	315	__put_user_err((x),(ptr),__pu_err); \
	316	__pu_err; \
	317	})
	318
	319	#define __put_user_error(x,ptr,err) \
	320	({ \
	321	__put_user_err((x),(ptr),err); \
	322	(void) 0; \
	323	})
	324
	325	#define __put_user_err(x,ptr,err) \
	326	do { \
	327	unsigned long __pu_addr = (unsigned long)(ptr); \
	328	__typeof__(*(ptr)) __pu_val = (x); \
	329	__chk_user_ptr(ptr); \
ad72907a	330	might_fault(); \
1da177e4 LT	331	switch (sizeof(*(ptr))) { \
	332	case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
	333	case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
	334	case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
	335	case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
	336	default: __put_user_bad(); \
	337	} \
	338	} while (0)
	339
	340	#define __put_user_asm_byte(x,__pu_addr,err) \
	341	__asm__ __volatile__( \
4e7682d0	342	"1: " TUSER(strb) " %1,[%2],#0\n" \
1da177e4	343	"2:\n" \
4260415f	344	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	345	" .align 2\n" \
	346	"3: mov %0, %3\n" \
	347	" b 2b\n" \
4260415f RK	348	" .popsection\n" \
4260415f RK	349	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	350	" .align 3\n" \
1da177e4 LT	351	" .long 1b, 3b\n" \
4260415f	352	" .popsection" \
1da177e4 LT	353	: "+r" (err) \
	354	: "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
	355	: "cc")
	356
	357	#ifndef __ARMEB__
	358	#define __put_user_asm_half(x,__pu_addr,err) \
	359	({ \
	360	unsigned long __temp = (unsigned long)(x); \
	361	__put_user_asm_byte(__temp, __pu_addr, err); \
	362	__put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
	363	})
	364	#else
	365	#define __put_user_asm_half(x,__pu_addr,err) \
	366	({ \
	367	unsigned long __temp = (unsigned long)(x); \
	368	__put_user_asm_byte(__temp >> 8, __pu_addr, err); \
	369	__put_user_asm_byte(__temp, __pu_addr + 1, err); \
	370	})
	371	#endif
	372
	373	#define __put_user_asm_word(x,__pu_addr,err) \
	374	__asm__ __volatile__( \
4e7682d0	375	"1: " TUSER(str) " %1,[%2],#0\n" \
1da177e4	376	"2:\n" \
4260415f	377	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	378	" .align 2\n" \
	379	"3: mov %0, %3\n" \
	380	" b 2b\n" \
4260415f RK	381	" .popsection\n" \
4260415f RK	382	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	383	" .align 3\n" \
1da177e4 LT	384	" .long 1b, 3b\n" \
4260415f	385	" .popsection" \
1da177e4 LT	386	: "+r" (err) \
	387	: "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
	388	: "cc")
	389
	390	#ifndef __ARMEB__
	391	#define __reg_oper0 "%R2"
	392	#define __reg_oper1 "%Q2"
	393	#else
	394	#define __reg_oper0 "%Q2"
	395	#define __reg_oper1 "%R2"
	396	#endif
	397
	398	#define __put_user_asm_dword(x,__pu_addr,err) \
	399	__asm__ __volatile__( \
4e7682d0 CM	400	ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \
	401	ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \
	402	THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \
	403	THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \
1da177e4	404	"3:\n" \
4260415f	405	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	406	" .align 2\n" \
	407	"4: mov %0, %3\n" \
	408	" b 3b\n" \
4260415f RK	409	" .popsection\n" \
4260415f RK	410	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	411	" .align 3\n" \
	412	" .long 1b, 4b\n" \
	413	" .long 2b, 4b\n" \
4260415f	414	" .popsection" \
1da177e4 LT	415	: "+r" (err), "+r" (__pu_addr) \
	416	: "r" (x), "i" (-EFAULT) \
	417	: "cc")
	418
02fcb974	419
9641c7cc	420	#ifdef CONFIG_MMU
99573298 RK	421	extern unsigned long __must_check __copy_from_user(void to, const void __user from, unsigned long n);
99573298 RK	422	extern unsigned long __must_check __copy_to_user(void __user to, const void from, unsigned long n);
a1f98849	423	extern unsigned long __must_check __copy_to_user_std(void __user to, const void from, unsigned long n);
99573298	424	extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
a1f98849	425	extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n);
9641c7cc RK	426	#else
	427	#define __copy_from_user(to,from,n) (memcpy(to, (void __force *)from, n), 0)
	428	#define __copy_to_user(to,from,n) (memcpy((void __force *)to, from, n), 0)
	429	#define __clear_user(addr,n) (memset((void __force *)addr, 0, n), 0)
	430	#endif
	431
99573298	432	static inline unsigned long __must_check copy_from_user(void to, const void __user from, unsigned long n)
1da177e4 LT	433	{
1da177e4 LT	434	if (access_ok(VERIFY_READ, from, n))
02fcb974	435	n = __copy_from_user(to, from, n);
1da177e4	436	else /* security hole - plug it */
59f0cb0f	437	memset(to, 0, n);
1da177e4 LT	438	return n;
	439	}
	440
99573298	441	static inline unsigned long __must_check copy_to_user(void __user to, const void from, unsigned long n)
1da177e4 LT	442	{
1da177e4 LT	443	if (access_ok(VERIFY_WRITE, to, n))
02fcb974	444	n = __copy_to_user(to, from, n);
1da177e4 LT	445	return n;
	446	}
	447
1da177e4 LT	448	#define __copy_to_user_inatomic __copy_to_user
	449	#define __copy_from_user_inatomic __copy_from_user
	450
99573298	451	static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
1da177e4 LT	452	{
1da177e4 LT	453	if (access_ok(VERIFY_WRITE, to, n))
02fcb974	454	n = __clear_user(to, n);
1da177e4 LT	455	return n;
	456	}
	457
8c56cc8b	458	extern long strncpy_from_user(char dest, const char __user src, long count);
1da177e4	459
8c56cc8b WD	460	extern __must_check long strlen_user(const char __user *str);
8c56cc8b WD	461	extern __must_check long strnlen_user(const char __user *str, long n);
1da177e4 LT	462
1da177e4 LT	463	#endif /* _ASMARM_UACCESS_H */