sh: Split out uaccess.h in to _32 and _64 variants.

/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $

 *

 * User space memory access functions

 *

 * Copyright (C) 1999, 2002  Niibe Yutaka

 * Copyright (C) 2003  Paul Mundt

 *

 *  Based on:

 *     MIPS implementation version 1.15 by

 *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle

 *     and i386 version.

 */

#ifndef __ASM_SH_UACCESS_H

#define __ASM_SH_UACCESS_H

#include <linux/errno.h>

#include <linux/sched.h>

#define VERIFY_READ    0

#define VERIFY_WRITE   1

/*

 * 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 (Data Segment Register?), these macros are misnamed.

 */

#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })

#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)

#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)

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

#define get_ds()	(KERNEL_DS)

#if !defined(CONFIG_MMU)

/* NOMMU is always true */

#define __addr_ok(addr) (1)

static inline mm_segment_t get_fs(void)

{

	return USER_DS;

}

static inline void set_fs(mm_segment_t s)

{

}

/*

 * __access_ok: Check if address with size is OK or not.

 *

 * If we don't have an MMU (or if its disabled) the only thing we really have

 * to look out for is if the address resides somewhere outside of what

 * available RAM we have.

 *

 * TODO: This check could probably also stand to be restricted somewhat more..

 * though it still does the Right Thing(tm) for the time being.

 */

static inline int __access_ok(unsigned long addr, unsigned long size)

{

	return ((addr >= memory_start) && ((addr + size) < memory_end));

}

#else /* CONFIG_MMU */

#define __addr_ok(addr) \

	((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))

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

#define set_fs(x)	(current_thread_info()->addr_limit = (x))

/*

 * __access_ok: Check if address with size is OK or not.

 *

 * Uhhuh, this needs 33-bit arithmetic. We have a carry..

 *

 * sum := addr + size;  carry? --> flag = true;

 * if (sum >= addr_limit) flag = true;

 */

static inline int __access_ok(unsigned long addr, unsigned long size)

{

	unsigned long flag, sum;

	__asm__("clrt\n\t"

		"addc	%3, %1\n\t"

		"movt	%0\n\t"

		"cmp/hi	%4, %1\n\t"

		"rotcl	%0"

		:"=&r" (flag), "=r" (sum)

		:"1" (addr), "r" (size),

		 "r" (current_thread_info()->addr_limit.seg)

		:"t");

	return flag == 0;

}

#endif /* CONFIG_MMU */

static inline int access_ok(int type, const void __user *p, unsigned long size)

{

	unsigned long addr = (unsigned long)p;

	return __access_ok(addr, size);

}

/*

 * Uh, these should become the main single-value transfer routines ...

 * They automatically use the right size if we just have the right

 * pointer type ...

 *

 * As SuperH uses the same address space for kernel and user data, we

 * can just do these as direct assignments.

 *

 * Careful to not

 * (a) re-use the arguments for side effects (sizeof is ok)

 * (b) require any knowledge of processes at this stage

 */

#define put_user(x,ptr)	__put_user_check((x),(ptr),sizeof(*(ptr)))

#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))

/*

 * The "__xxx" versions do not do address space checking, useful when

 * doing multiple accesses to the same area (the user has to do the

 * checks by hand with "access_ok()")

 */

#define __put_user(x,ptr) \

  __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))

#define __get_user(x,ptr) \

  __get_user_nocheck((x),(ptr),sizeof(*(ptr)))

struct __large_struct { unsigned long buf[100]; };

#define __m(x) (*(struct __large_struct __user *)(x))

#define __get_user_size(x,ptr,size,retval)			\

do {								\

	retval = 0;						\

	__chk_user_ptr(ptr);					\

	switch (size) {						\

	case 1:							\

		__get_user_asm(x, ptr, retval, "b");		\

		break;						\

	case 2:							\

		__get_user_asm(x, ptr, retval, "w");		\

		break;						\

	case 4:							\

		__get_user_asm(x, ptr, retval, "l");		\

		break;						\

	default:						\

		__get_user_unknown();				\

		break;						\

	}							\

} while (0)

#define __get_user_nocheck(x,ptr,size)				\

({								\

	long __gu_err, __gu_val;				\

	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\

	(x) = (__typeof__(*(ptr)))__gu_val;			\

	__gu_err;						\

})

#ifdef CONFIG_MMU

#define __get_user_check(x,ptr,size)				\

({								\

	long __gu_err, __gu_val;				\

	__chk_user_ptr(ptr);					\

	switch (size) {						\

	case 1:							\

		__get_user_1(__gu_val, (ptr), __gu_err);	\

		break;						\

	case 2:							\

		__get_user_2(__gu_val, (ptr), __gu_err);	\

		break;						\

	case 4:							\

		__get_user_4(__gu_val, (ptr), __gu_err);	\

		break;						\

	default:						\

		__get_user_unknown();				\

		break;						\

	}							\

								\

	(x) = (__typeof__(*(ptr)))__gu_val;			\

	__gu_err;						\

})

#define __get_user_1(x,addr,err) ({		\

__asm__("stc	r7_bank, %1\n\t"		\

	"mov.l	@(8,%1), %1\n\t"		\

	"and	%2, %1\n\t"			\

	"cmp/pz	%1\n\t"				\

	"bt/s	1f\n\t"				\

	" mov	#0, %0\n\t"			\

	"0:\n"					\

	"mov	#-14, %0\n\t"			\

	"bra	2f\n\t"				\

	" mov	#0, %1\n"			\

	"1:\n\t"				\

	"mov.b	@%2, %1\n\t"			\

	"extu.b	%1, %1\n"			\

	"2:\n"					\

	".section	__ex_table,\"a\"\n\t"	\

	".long	1b, 0b\n\t"			\

	".previous"				\

	: "=&r" (err), "=&r" (x)		\

	: "r" (addr)				\

	: "t");					\

})

#define __get_user_2(x,addr,err) ({		\

__asm__("stc	r7_bank, %1\n\t"		\

	"mov.l	@(8,%1), %1\n\t"		\

	"and	%2, %1\n\t"			\

	"cmp/pz	%1\n\t"				\

	"bt/s	1f\n\t"				\

	" mov	#0, %0\n\t"			\

	"0:\n"					\

	"mov	#-14, %0\n\t"			\

	"bra	2f\n\t"				\

	" mov	#0, %1\n"			\

	"1:\n\t"				\

	"mov.w	@%2, %1\n\t"			\

	"extu.w	%1, %1\n"			\

	"2:\n"					\

	".section	__ex_table,\"a\"\n\t"	\

	".long	1b, 0b\n\t"			\

	".previous"				\

	: "=&r" (err), "=&r" (x)		\

	: "r" (addr)				\

	: "t");					\

})

#define __get_user_4(x,addr,err) ({		\

__asm__("stc	r7_bank, %1\n\t"		\

	"mov.l	@(8,%1), %1\n\t"		\

	"and	%2, %1\n\t"			\

	"cmp/pz	%1\n\t"				\

	"bt/s	1f\n\t"				\

	" mov	#0, %0\n\t"			\

	"0:\n"					\

	"mov	#-14, %0\n\t"			\

	"bra	2f\n\t"				\

	" mov	#0, %1\n"			\

	"1:\n\t"				\

	"mov.l	@%2, %1\n\t"			\

	"2:\n"					\

	".section	__ex_table,\"a\"\n\t"	\

	".long	1b, 0b\n\t"			\

	".previous"				\

	: "=&r" (err), "=&r" (x)		\

	: "r" (addr)				\

	: "t");					\

})

#else /* CONFIG_MMU */

#define __get_user_check(x,ptr,size)					\

({									\

	long __gu_err, __gu_val;					\

	if (__access_ok((unsigned long)(ptr), (size))) {		\

		__get_user_size(__gu_val, (ptr), (size), __gu_err);	\

		(x) = (__typeof__(*(ptr)))__gu_val;			\

	} else								\

		__gu_err = -EFAULT;					\

	__gu_err;							\

})

#endif

#define __get_user_asm(x, addr, err, insn) \

({ \

__asm__ __volatile__( \

	"1:\n\t" \

	"mov." insn "	%2, %1\n\t" \

	"mov	#0, %0\n" \

	"2:\n" \

	".section	.fixup,\"ax\"\n" \

	"3:\n\t" \

	"mov	#0, %1\n\t" \

	"mov.l	4f, %0\n\t" \

	"jmp	@%0\n\t" \

	" mov	%3, %0\n" \

	"4:	.long	2b\n\t" \

	".previous\n" \

	".section	__ex_table,\"a\"\n\t" \

	".long	1b, 3b\n\t" \

	".previous" \

	:"=&r" (err), "=&r" (x) \

	:"m" (__m(addr)), "i" (-EFAULT)); })

extern void __get_user_unknown(void);

#define __put_user_size(x,ptr,size,retval)		\

do {							\

	retval = 0;					\

	__chk_user_ptr(ptr);				\

	switch (size) {					\

	case 1:						\

		__put_user_asm(x, ptr, retval, "b");	\

		break;					\

	case 2:						\

		__put_user_asm(x, ptr, retval, "w");	\

		break;					\

	case 4:						\

		__put_user_asm(x, ptr, retval, "l");	\

		break;					\

	case 8:						\

		__put_user_u64(x, ptr, retval);		\

		break;					\

	default:					\

		__put_user_unknown();			\

	}						\

} while (0)

#define __put_user_nocheck(x,ptr,size)			\

({							\

	long __pu_err;					\

	__put_user_size((x),(ptr),(size),__pu_err);	\

	__pu_err;					\

})

#define __put_user_check(x,ptr,size)				\

({								\

	long __pu_err = -EFAULT;				\

	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\

								\

	if (__access_ok((unsigned long)__pu_addr,size))		\

		__put_user_size((x),__pu_addr,(size),__pu_err);	\

	__pu_err;						\

})

#define __put_user_asm(x, addr, err, insn) \

({ \

__asm__ __volatile__( \

	"1:\n\t" \

	"mov." insn "	%1, %2\n\t" \

	"mov	#0, %0\n" \

	"2:\n" \

	".section	.fixup,\"ax\"\n" \

	"3:\n\t" \

	"nop\n\t" \

	"mov.l	4f, %0\n\t" \

	"jmp	@%0\n\t" \

	"mov	%3, %0\n" \

	"4:	.long	2b\n\t" \

	".previous\n" \

	".section	__ex_table,\"a\"\n\t" \

	".long	1b, 3b\n\t" \

	".previous" \

	:"=&r" (err) \

	:"r" (x), "m" (__m(addr)), "i" (-EFAULT) \

        :"memory"); })

#if defined(__LITTLE_ENDIAN__)

#define __put_user_u64(val,addr,retval) \

({ \

__asm__ __volatile__( \

	"1:\n\t" \

	"mov.l	%R1,%2\n\t" \

	"mov.l	%S1,%T2\n\t" \

	"mov	#0,%0\n" \

	"2:\n" \

	".section	.fixup,\"ax\"\n" \

	"3:\n\t" \

	"nop\n\t" \

	"mov.l	4f,%0\n\t" \

	"jmp	@%0\n\t" \

	" mov	%3,%0\n" \

	"4:	.long	2b\n\t" \

	".previous\n" \

	".section	__ex_table,\"a\"\n\t" \

	".long	1b, 3b\n\t" \

	".previous" \

	: "=r" (retval) \

	: "r" (val), "m" (__m(addr)), "i" (-EFAULT) \

        : "memory"); })

#ifdef CONFIG_SUPERH32

# include "uaccess_32.h"

#else

#define __put_user_u64(val,addr,retval) \

({ \

__asm__ __volatile__( \

	"1:\n\t" \

	"mov.l	%S1,%2\n\t" \

	"mov.l	%R1,%T2\n\t" \

	"mov	#0,%0\n" \

	"2:\n" \

	".section	.fixup,\"ax\"\n" \

	"3:\n\t" \

	"nop\n\t" \

	"mov.l	4f,%0\n\t" \

	"jmp	@%0\n\t" \

	" mov	%3,%0\n" \

	"4:	.long	2b\n\t" \

	".previous\n" \

	".section	__ex_table,\"a\"\n\t" \

	".long	1b, 3b\n\t" \

	".previous" \

	: "=r" (retval) \

	: "r" (val), "m" (__m(addr)), "i" (-EFAULT) \

        : "memory"); })

# include "uaccess_64.h"

#endif

extern void __put_user_unknown(void);

/* Generic arbitrary sized copy.  */

/* Return the number of bytes NOT copied */

__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);

#define copy_to_user(to,from,n) ({ \

void *__copy_to = (void *) (to); \

__kernel_size_t __copy_size = (__kernel_size_t) (n); \

__kernel_size_t __copy_res; \

if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \

__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \

} else __copy_res = __copy_size; \

__copy_res; })

#define copy_from_user(to,from,n) ({ \

void *__copy_to = (void *) (to); \

void *__copy_from = (void *) (from); \

__kernel_size_t __copy_size = (__kernel_size_t) (n); \

__kernel_size_t __copy_res; \

if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \

__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \

} else __copy_res = __copy_size; \

__copy_res; })

static __always_inline unsigned long

__copy_from_user(void *to, const void __user *from, unsigned long n)

{

	return __copy_user(to, (__force void *)from, n);

}

static __always_inline unsigned long __must_check

__copy_to_user(void __user *to, const void *from, unsigned long n)

{

	return __copy_user((__force void *)to, from, n);

}

#define __copy_to_user_inatomic __copy_to_user

#define __copy_from_user_inatomic __copy_from_user

/*

 * Clear the area and return remaining number of bytes

 * (on failure.  Usually it's 0.)

 */

extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);

#define clear_user(addr,n) ({ \

void * __cl_addr = (addr); \

unsigned long __cl_size = (n); \

if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \

__cl_size = __clear_user(__cl_addr, __cl_size); \

__cl_size; })

static __inline__ int

__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)

{

	__kernel_size_t res;

	unsigned long __dummy, _d, _s;

	__asm__ __volatile__(

		"9:\n"

		"mov.b	@%2+, %1\n\t"

		"cmp/eq	#0, %1\n\t"

		"bt/s	2f\n"

		"1:\n"

		"mov.b	%1, @%3\n\t"

		"dt	%7\n\t"

		"bf/s	9b\n\t"

		" add	#1, %3\n\t"

		"2:\n\t"

		"sub	%7, %0\n"

		"3:\n"

		".section .fixup,\"ax\"\n"

		"4:\n\t"

		"mov.l	5f, %1\n\t"

		"jmp	@%1\n\t"

		" mov	%8, %0\n\t"

		".balign 4\n"

		"5:	.long 3b\n"

		".previous\n"

		".section __ex_table,\"a\"\n"

		"	.balign 4\n"

		"	.long 9b,4b\n"

		".previous"

		: "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d)

		: "0" (__count), "2" (__src), "3" (__dest), "r" (__count),

		  "i" (-EFAULT)

		: "memory", "t");

	return res;

}

#define strncpy_from_user(dest,src,count) ({ \

unsigned long __sfu_src = (unsigned long) (src); \

int __sfu_count = (int) (count); \

long __sfu_res = -EFAULT; \

if(__access_ok(__sfu_src, __sfu_count)) { \

__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \

} __sfu_res; })

/*

 * Return the size of a string (including the ending 0!)

 */

static __inline__ long __strnlen_user(const char __user *__s, long __n)

{

	unsigned long res;

	unsigned long __dummy;

	__asm__ __volatile__(

		"9:\n"

		"cmp/eq	%4, %0\n\t"

		"bt	2f\n"

		"1:\t"

		"mov.b	@(%0,%3), %1\n\t"

		"tst	%1, %1\n\t"

		"bf/s	9b\n\t"

		" add	#1, %0\n"

		"2:\n"

		".section .fixup,\"ax\"\n"

		"3:\n\t"

		"mov.l	4f, %1\n\t"

		"jmp	@%1\n\t"

		" mov	#0, %0\n"

		".balign 4\n"

		"4:	.long 2b\n"

		".previous\n"

		".section __ex_table,\"a\"\n"

		"	.balign 4\n"

		"	.long 1b,3b\n"

		".previous"

		: "=z" (res), "=&r" (__dummy)

		: "0" (0), "r" (__s), "r" (__n)

		: "t");

	return res;

}

static __inline__ long strnlen_user(const char __user *s, long n)

{

	if (!__addr_ok(s))

		return 0;

	else

		return __strnlen_user(s, n);

}

#define strlen_user(str)	strnlen_user(str, ~0UL >> 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);

#endif /* __ASM_SH_UACCESS_H */