[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>

#if __LINUX_ARM_ARCH__ < 6
#include <asm-generic/uaccess-unaligned.h>
#else
#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user
#endif

#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)		((void)(addr),1)
#define __range_ok(addr,size)	((void)(addr),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	21
c89efa73 NP	22	#if __LINUX_ARM_ARCH__ < 6
	23	#include <asm-generic/uaccess-unaligned.h>
	24	#else
	25	#define __get_user_unaligned __get_user
	26	#define __put_user_unaligned __put_user
	27	#endif
	28
1da177e4 LT	29	#define VERIFY_READ 0
	30	#define VERIFY_WRITE 1
	31
	32	/*
	33	* The exception table consists of pairs of addresses: the first is the
	34	* address of an instruction that is allowed to fault, and the second is
	35	* the address at which the program should continue. No registers are
	36	* modified, so it is entirely up to the continuation code to figure out
	37	* what to do.
	38	*
	39	* All the routines below use bits of fixup code that are out of line
	40	* with the main instruction path. This means when everything is well,
	41	* we don't even have to jump over them. Further, they do not intrude
	42	* on our cache or tlb entries.
	43	*/
	44
	45	struct exception_table_entry
	46	{
	47	unsigned long insn, fixup;
	48	};
	49
	50	extern int fixup_exception(struct pt_regs *regs);
	51
9641c7cc RK	52	/*
	53	* These two are intentionally not defined anywhere - if the kernel
	54	* code generates any references to them, that's a bug.
	55	*/
	56	extern int __get_user_bad(void);
	57	extern int __put_user_bad(void);
	58
1da177e4 LT	59	/*
	60	* Note that this is actually 0x1,0000,0000
	61	*/
	62	#define KERNEL_DS 0x00000000
1da177e4	63	#define get_ds() (KERNEL_DS)
9641c7cc RK	64
	65	#ifdef CONFIG_MMU
	66
	67	#define USER_DS TASK_SIZE
1da177e4 LT	68	#define get_fs() (current_thread_info()->addr_limit)
1da177e4 LT	69
9641c7cc	70	static inline void set_fs(mm_segment_t fs)
1da177e4 LT	71	{
	72	current_thread_info()->addr_limit = fs;
	73	modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
	74	}
	75
	76	#define segment_eq(a,b) ((a) == (b))
	77
	78	#define __addr_ok(addr) ({ \
	79	unsigned long flag; \
	80	__asm__("cmp %2, %0; movlo %0, #0" \
	81	: "=&r" (flag) \
	82	: "0" (current_thread_info()->addr_limit), "r" (addr) \
	83	: "cc"); \
	84	(flag == 0); })
	85
	86	/* We use 33-bit arithmetic here... */
	87	#define __range_ok(addr,size) ({ \
16cf5b39	88	unsigned long flag, roksum; \
1da177e4 LT	89	__chk_user_ptr(addr); \
1da177e4 LT	90	__asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
16cf5b39	91	: "=&r" (flag), "=&r" (roksum) \
1da177e4 LT	92	: "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
	93	: "cc"); \
	94	flag; })
	95
1da177e4 LT	96	/*
	97	* Single-value transfer routines. They automatically use the right
	98	* size if we just have the right pointer type. Note that the functions
	99	* which read from user space (get_) need to take care not to leak
	100	* kernel data even if the calling code is buggy and fails to check
	101	* the return value. This means zeroing out the destination variable
	102	* or buffer on error. Normally this is done out of line by the
	103	* fixup code, but there are a few places where it intrudes on the
	104	* main code path. When we only write to user space, there is no
	105	* problem.
1da177e4	106	*/
1da177e4 LT	107	extern int __get_user_1(void *);
	108	extern int __get_user_2(void *);
	109	extern int __get_user_4(void *);
1da177e4	110
8404663f RK	111	#define __GUP_CLOBBER_1 "lr", "cc"
	112	#ifdef CONFIG_CPU_USE_DOMAINS
	113	#define __GUP_CLOBBER_2 "ip", "lr", "cc"
	114	#else
	115	#define __GUP_CLOBBER_2 "lr", "cc"
	116	#endif
	117	#define __GUP_CLOBBER_4 "lr", "cc"
	118
	119	#define __get_user_x(__r2,__p,__e,__l,__s) \
1da177e4 LT	120	__asm__ __volatile__ ( \
1da177e4 LT	121	__asmeq("%0", "r0") __asmeq("%1", "r2") \
8404663f	122	__asmeq("%3", "r1") \
1da177e4 LT	123	"bl __get_user_" #__s \
1da177e4 LT	124	: "=&r" (__e), "=r" (__r2) \
8404663f RK	125	: "0" (__p), "r" (__l) \
8404663f RK	126	: __GUP_CLOBBER_##__s)
1da177e4	127
ad72907a	128	#define __get_user_check(x,p) \
1da177e4	129	({ \
8404663f	130	unsigned long __limit = current_thread_info()->addr_limit - 1; \
c5a69d57	131	register const typeof((p)) __user __p asm("r0") = (p);\
fc048b5b	132	register unsigned long __r2 asm("r2"); \
8404663f	133	register unsigned long __l asm("r1") = __limit; \
1da177e4 LT	134	register int __e asm("r0"); \
	135	switch (sizeof(*(__p))) { \
	136	case 1: \
8404663f RK	137	__get_user_x(__r2, __p, __e, __l, 1); \
8404663f RK	138	break; \
1da177e4	139	case 2: \
8404663f	140	__get_user_x(__r2, __p, __e, __l, 2); \
1da177e4 LT	141	break; \
1da177e4 LT	142	case 4: \
8404663f	143	__get_user_x(__r2, __p, __e, __l, 4); \
1da177e4	144	break; \
1da177e4 LT	145	default: __e = __get_user_bad(); break; \
1da177e4 LT	146	} \
d2c5b690	147	x = (typeof(*(p))) __r2; \
1da177e4 LT	148	__e; \
	149	})
	150
ad72907a WD	151	#define get_user(x,p) \
	152	({ \
	153	might_fault(); \
	154	__get_user_check(x,p); \
	155	})
	156
9641c7cc RK	157	extern int __put_user_1(void *, unsigned int);
	158	extern int __put_user_2(void *, unsigned int);
	159	extern int __put_user_4(void *, unsigned int);
	160	extern int __put_user_8(void *, unsigned long long);
	161
8404663f	162	#define __put_user_x(__r2,__p,__e,__l,__s) \
9641c7cc RK	163	__asm__ __volatile__ ( \
9641c7cc RK	164	__asmeq("%0", "r0") __asmeq("%2", "r2") \
8404663f	165	__asmeq("%3", "r1") \
9641c7cc RK	166	"bl __put_user_" #__s \
9641c7cc RK	167	: "=&r" (__e) \
8404663f	168	: "0" (__p), "r" (__r2), "r" (__l) \
9641c7cc RK	169	: "ip", "lr", "cc")
9641c7cc RK	170
ad72907a	171	#define __put_user_check(x,p) \
9641c7cc	172	({ \
8404663f	173	unsigned long __limit = current_thread_info()->addr_limit - 1; \
c5a69d57 TK	174	register const typeof(*(p)) __r2 asm("r2") = (x); \
c5a69d57 TK	175	register const typeof((p)) __user __p asm("r0") = (p);\
8404663f	176	register unsigned long __l asm("r1") = __limit; \
9641c7cc RK	177	register int __e asm("r0"); \
	178	switch (sizeof(*(__p))) { \
	179	case 1: \
8404663f	180	__put_user_x(__r2, __p, __e, __l, 1); \
9641c7cc RK	181	break; \
9641c7cc RK	182	case 2: \
8404663f	183	__put_user_x(__r2, __p, __e, __l, 2); \
9641c7cc RK	184	break; \
9641c7cc RK	185	case 4: \
8404663f	186	__put_user_x(__r2, __p, __e, __l, 4); \
9641c7cc RK	187	break; \
9641c7cc RK	188	case 8: \
8404663f	189	__put_user_x(__r2, __p, __e, __l, 8); \
9641c7cc RK	190	break; \
	191	default: __e = __put_user_bad(); break; \
	192	} \
	193	__e; \
	194	})
	195
ad72907a WD	196	#define put_user(x,p) \
	197	({ \
	198	might_fault(); \
	199	__put_user_check(x,p); \
	200	})
	201
9641c7cc RK	202	#else /* CONFIG_MMU */
	203
	204	/*
	205	* uClinux has only one addr space, so has simplified address limits.
	206	*/
	207	#define USER_DS KERNEL_DS
	208
	209	#define segment_eq(a,b) (1)
8e7fc18b AB	210	#define __addr_ok(addr) ((void)(addr),1)
8e7fc18b AB	211	#define __range_ok(addr,size) ((void)(addr),0)
9641c7cc RK	212	#define get_fs() (KERNEL_DS)
	213
	214	static inline void set_fs(mm_segment_t fs)
	215	{
	216	}
	217
	218	#define get_user(x,p) __get_user(x,p)
	219	#define put_user(x,p) __put_user(x,p)
	220
	221	#endif /* CONFIG_MMU */
	222
	223	#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
	224
8c56cc8b WD	225	#define user_addr_max() \
	226	(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
	227
9641c7cc RK	228	/*
	229	* The "__xxx" versions of the user access functions do not verify the
	230	* address space - it must have been done previously with a separate
	231	* "access_ok()" call.
	232	*
	233	* The "xxx_error" versions set the third argument to EFAULT if an
	234	* error occurs, and leave it unchanged on success. Note that these
	235	* versions are void (ie, don't return a value as such).
	236	*/
1da177e4 LT	237	#define __get_user(x,ptr) \
	238	({ \
	239	long __gu_err = 0; \
	240	__get_user_err((x),(ptr),__gu_err); \
	241	__gu_err; \
	242	})
	243
	244	#define __get_user_error(x,ptr,err) \
	245	({ \
	246	__get_user_err((x),(ptr),err); \
	247	(void) 0; \
	248	})
	249
	250	#define __get_user_err(x,ptr,err) \
	251	do { \
	252	unsigned long __gu_addr = (unsigned long)(ptr); \
	253	unsigned long __gu_val; \
	254	__chk_user_ptr(ptr); \
ad72907a	255	might_fault(); \
1da177e4 LT	256	switch (sizeof(*(ptr))) { \
	257	case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
	258	case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
	259	case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
	260	default: (__gu_val) = __get_user_bad(); \
	261	} \
	262	(x) = (__typeof__(*(ptr)))__gu_val; \
	263	} while (0)
	264
	265	#define __get_user_asm_byte(x,addr,err) \
	266	__asm__ __volatile__( \
4e7682d0	267	"1: " TUSER(ldrb) " %1,[%2],#0\n" \
1da177e4	268	"2:\n" \
4260415f	269	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	270	" .align 2\n" \
	271	"3: mov %0, %3\n" \
	272	" mov %1, #0\n" \
	273	" b 2b\n" \
4260415f RK	274	" .popsection\n" \
4260415f RK	275	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	276	" .align 3\n" \
1da177e4 LT	277	" .long 1b, 3b\n" \
4260415f	278	" .popsection" \
1da177e4 LT	279	: "+r" (err), "=&r" (x) \
	280	: "r" (addr), "i" (-EFAULT) \
	281	: "cc")
	282
	283	#ifndef __ARMEB__
	284	#define __get_user_asm_half(x,__gu_addr,err) \
	285	({ \
	286	unsigned long __b1, __b2; \
	287	__get_user_asm_byte(__b1, __gu_addr, err); \
	288	__get_user_asm_byte(__b2, __gu_addr + 1, err); \
	289	(x) = __b1 \| (__b2 << 8); \
	290	})
	291	#else
	292	#define __get_user_asm_half(x,__gu_addr,err) \
	293	({ \
	294	unsigned long __b1, __b2; \
	295	__get_user_asm_byte(__b1, __gu_addr, err); \
	296	__get_user_asm_byte(__b2, __gu_addr + 1, err); \
	297	(x) = (__b1 << 8) \| __b2; \
	298	})
	299	#endif
	300
	301	#define __get_user_asm_word(x,addr,err) \
	302	__asm__ __volatile__( \
4e7682d0	303	"1: " TUSER(ldr) " %1,[%2],#0\n" \
1da177e4	304	"2:\n" \
4260415f	305	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	306	" .align 2\n" \
	307	"3: mov %0, %3\n" \
	308	" mov %1, #0\n" \
	309	" b 2b\n" \
4260415f RK	310	" .popsection\n" \
4260415f RK	311	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	312	" .align 3\n" \
1da177e4 LT	313	" .long 1b, 3b\n" \
4260415f	314	" .popsection" \
1da177e4 LT	315	: "+r" (err), "=&r" (x) \
	316	: "r" (addr), "i" (-EFAULT) \
	317	: "cc")
	318
1da177e4 LT	319	#define __put_user(x,ptr) \
	320	({ \
	321	long __pu_err = 0; \
	322	__put_user_err((x),(ptr),__pu_err); \
	323	__pu_err; \
	324	})
	325
	326	#define __put_user_error(x,ptr,err) \
	327	({ \
	328	__put_user_err((x),(ptr),err); \
	329	(void) 0; \
	330	})
	331
	332	#define __put_user_err(x,ptr,err) \
	333	do { \
	334	unsigned long __pu_addr = (unsigned long)(ptr); \
	335	__typeof__(*(ptr)) __pu_val = (x); \
	336	__chk_user_ptr(ptr); \
ad72907a	337	might_fault(); \
1da177e4 LT	338	switch (sizeof(*(ptr))) { \
	339	case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
	340	case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
	341	case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
	342	case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
	343	default: __put_user_bad(); \
	344	} \
	345	} while (0)
	346
	347	#define __put_user_asm_byte(x,__pu_addr,err) \
	348	__asm__ __volatile__( \
4e7682d0	349	"1: " TUSER(strb) " %1,[%2],#0\n" \
1da177e4	350	"2:\n" \
4260415f	351	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	352	" .align 2\n" \
	353	"3: mov %0, %3\n" \
	354	" b 2b\n" \
4260415f RK	355	" .popsection\n" \
4260415f RK	356	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	357	" .align 3\n" \
1da177e4 LT	358	" .long 1b, 3b\n" \
4260415f	359	" .popsection" \
1da177e4 LT	360	: "+r" (err) \
	361	: "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
	362	: "cc")
	363
	364	#ifndef __ARMEB__
	365	#define __put_user_asm_half(x,__pu_addr,err) \
	366	({ \
	367	unsigned long __temp = (unsigned long)(x); \
	368	__put_user_asm_byte(__temp, __pu_addr, err); \
	369	__put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
	370	})
	371	#else
	372	#define __put_user_asm_half(x,__pu_addr,err) \
	373	({ \
	374	unsigned long __temp = (unsigned long)(x); \
	375	__put_user_asm_byte(__temp >> 8, __pu_addr, err); \
	376	__put_user_asm_byte(__temp, __pu_addr + 1, err); \
	377	})
	378	#endif
	379
	380	#define __put_user_asm_word(x,__pu_addr,err) \
	381	__asm__ __volatile__( \
4e7682d0	382	"1: " TUSER(str) " %1,[%2],#0\n" \
1da177e4	383	"2:\n" \
4260415f	384	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	385	" .align 2\n" \
	386	"3: mov %0, %3\n" \
	387	" b 2b\n" \
4260415f RK	388	" .popsection\n" \
4260415f RK	389	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	390	" .align 3\n" \
1da177e4 LT	391	" .long 1b, 3b\n" \
4260415f	392	" .popsection" \
1da177e4 LT	393	: "+r" (err) \
	394	: "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
	395	: "cc")
	396
	397	#ifndef __ARMEB__
	398	#define __reg_oper0 "%R2"
	399	#define __reg_oper1 "%Q2"
	400	#else
	401	#define __reg_oper0 "%Q2"
	402	#define __reg_oper1 "%R2"
	403	#endif
	404
	405	#define __put_user_asm_dword(x,__pu_addr,err) \
	406	__asm__ __volatile__( \
4e7682d0 CM	407	ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \
	408	ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \
	409	THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \
	410	THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \
1da177e4	411	"3:\n" \
4260415f	412	" .pushsection .fixup,\"ax\"\n" \
1da177e4 LT	413	" .align 2\n" \
	414	"4: mov %0, %3\n" \
	415	" b 3b\n" \
4260415f RK	416	" .popsection\n" \
4260415f RK	417	" .pushsection __ex_table,\"a\"\n" \
1da177e4 LT	418	" .align 3\n" \
	419	" .long 1b, 4b\n" \
	420	" .long 2b, 4b\n" \
4260415f	421	" .popsection" \
1da177e4 LT	422	: "+r" (err), "+r" (__pu_addr) \
	423	: "r" (x), "i" (-EFAULT) \
	424	: "cc")
	425
02fcb974	426
9641c7cc	427	#ifdef CONFIG_MMU
99573298 RK	428	extern unsigned long __must_check __copy_from_user(void to, const void __user from, unsigned long n);
99573298 RK	429	extern unsigned long __must_check __copy_to_user(void __user to, const void from, unsigned long n);
a1f98849	430	extern unsigned long __must_check __copy_to_user_std(void __user to, const void from, unsigned long n);
99573298	431	extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
a1f98849	432	extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n);
9641c7cc RK	433	#else
	434	#define __copy_from_user(to,from,n) (memcpy(to, (void __force *)from, n), 0)
	435	#define __copy_to_user(to,from,n) (memcpy((void __force *)to, from, n), 0)
	436	#define __clear_user(addr,n) (memset((void __force *)addr, 0, n), 0)
	437	#endif
	438
99573298	439	static inline unsigned long __must_check copy_from_user(void to, const void __user from, unsigned long n)
1da177e4 LT	440	{
1da177e4 LT	441	if (access_ok(VERIFY_READ, from, n))
02fcb974	442	n = __copy_from_user(to, from, n);
1da177e4	443	else /* security hole - plug it */
59f0cb0f	444	memset(to, 0, n);
1da177e4 LT	445	return n;
	446	}
	447
99573298	448	static inline unsigned long __must_check copy_to_user(void __user to, const void from, unsigned long n)
1da177e4 LT	449	{
1da177e4 LT	450	if (access_ok(VERIFY_WRITE, to, n))
02fcb974	451	n = __copy_to_user(to, from, n);
1da177e4 LT	452	return n;
	453	}
	454
1da177e4 LT	455	#define __copy_to_user_inatomic __copy_to_user
	456	#define __copy_from_user_inatomic __copy_from_user
	457
99573298	458	static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
1da177e4 LT	459	{
1da177e4 LT	460	if (access_ok(VERIFY_WRITE, to, n))
02fcb974	461	n = __clear_user(to, n);
1da177e4 LT	462	return n;
	463	}
	464
8c56cc8b	465	extern long strncpy_from_user(char dest, const char __user src, long count);
1da177e4	466
8c56cc8b WD	467	extern __must_check long strlen_user(const char __user *str);
8c56cc8b WD	468	extern __must_check long strnlen_user(const char __user *str, long n);
1da177e4 LT	469
1da177e4 LT	470	#endif /* _ASMARM_UACCESS_H */