[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / uaccess_64.h

#ifndef _ASM_X86_UACCESS_64_H
#define _ASM_X86_UACCESS_64_H

/*
 * User space memory access functions
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/lockdep.h>
#include <asm/alternative.h>
#include <asm/cpufeature.h>
#include <asm/page.h>

/*
 * Copy To/From Userspace
 */

/* Handles exceptions in both to and from, but doesn't do access_ok */
__must_check unsigned long
copy_user_generic_string(void *to, const void *from, unsigned len);
__must_check unsigned long
copy_user_generic_unrolled(void *to, const void *from, unsigned len);

static __always_inline __must_check unsigned long
copy_user_generic(void *to, const void *from, unsigned len)
{
	unsigned ret;

	alternative_call(copy_user_generic_unrolled,
			 copy_user_generic_string,
			 X86_FEATURE_REP_GOOD,
			 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
				     "=d" (len)),
			 "1" (to), "2" (from), "3" (len)
			 : "memory", "rcx", "r8", "r9", "r10", "r11");
	return ret;
}

__must_check unsigned long
_copy_to_user(void __user *to, const void *from, unsigned len);
__must_check unsigned long
_copy_from_user(void *to, const void __user *from, unsigned len);
__must_check unsigned long
copy_in_user(void __user *to, const void __user *from, unsigned len);

static inline unsigned long __must_check copy_from_user(void *to,
					  const void __user *from,
					  unsigned long n)
{
	int sz = __compiletime_object_size(to);

	might_fault();
	if (likely(sz == -1 || sz >= n))
		n = _copy_from_user(to, from, n);
#ifdef CONFIG_DEBUG_VM
	else
		WARN(1, "Buffer overflow detected!\n");
#endif
	return n;
}

static __always_inline __must_check
int copy_to_user(void __user *dst, const void *src, unsigned size)
{
	might_fault();

	return _copy_to_user(dst, src, size);
}

static __always_inline __must_check
int __copy_from_user(void *dst, const void __user *src, unsigned size)
{
	int ret = 0;

	might_fault();
	if (!__builtin_constant_p(size))
		return copy_user_generic(dst, (__force void *)src, size);
	switch (size) {
	case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
			      ret, "b", "b", "=q", 1);
		return ret;
	case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
			      ret, "w", "w", "=r", 2);
		return ret;
	case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
			      ret, "l", "k", "=r", 4);
		return ret;
	case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
			      ret, "q", "", "=r", 8);
		return ret;
	case 10:
		__get_user_asm(*(u64 *)dst, (u64 __user *)src,
			       ret, "q", "", "=r", 10);
		if (unlikely(ret))
			return ret;
		__get_user_asm(*(u16 *)(8 + (char *)dst),
			       (u16 __user *)(8 + (char __user *)src),
			       ret, "w", "w", "=r", 2);
		return ret;
	case 16:
		__get_user_asm(*(u64 *)dst, (u64 __user *)src,
			       ret, "q", "", "=r", 16);
		if (unlikely(ret))
			return ret;
		__get_user_asm(*(u64 *)(8 + (char *)dst),
			       (u64 __user *)(8 + (char __user *)src),
			       ret, "q", "", "=r", 8);
		return ret;
	default:
		return copy_user_generic(dst, (__force void *)src, size);
	}
}

static __always_inline __must_check
int __copy_to_user(void __user *dst, const void *src, unsigned size)
{
	int ret = 0;

	might_fault();
	if (!__builtin_constant_p(size))
		return copy_user_generic((__force void *)dst, src, size);
	switch (size) {
	case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
			      ret, "b", "b", "iq", 1);
		return ret;
	case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
			      ret, "w", "w", "ir", 2);
		return ret;
	case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
			      ret, "l", "k", "ir", 4);
		return ret;
	case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
			      ret, "q", "", "er", 8);
		return ret;
	case 10:
		__put_user_asm(*(u64 *)src, (u64 __user *)dst,
			       ret, "q", "", "er", 10);
		if (unlikely(ret))
			return ret;
		asm("":::"memory");
		__put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
			       ret, "w", "w", "ir", 2);
		return ret;
	case 16:
		__put_user_asm(*(u64 *)src, (u64 __user *)dst,
			       ret, "q", "", "er", 16);
		if (unlikely(ret))
			return ret;
		asm("":::"memory");
		__put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
			       ret, "q", "", "er", 8);
		return ret;
	default:
		return copy_user_generic((__force void *)dst, src, size);
	}
}

static __always_inline __must_check
int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
{
	int ret = 0;

	might_fault();
	if (!__builtin_constant_p(size))
		return copy_user_generic((__force void *)dst,
					 (__force void *)src, size);
	switch (size) {
	case 1: {
		u8 tmp;
		__get_user_asm(tmp, (u8 __user *)src,
			       ret, "b", "b", "=q", 1);
		if (likely(!ret))
			__put_user_asm(tmp, (u8 __user *)dst,
				       ret, "b", "b", "iq", 1);
		return ret;
	}
	case 2: {
		u16 tmp;
		__get_user_asm(tmp, (u16 __user *)src,
			       ret, "w", "w", "=r", 2);
		if (likely(!ret))
			__put_user_asm(tmp, (u16 __user *)dst,
				       ret, "w", "w", "ir", 2);
		return ret;
	}

	case 4: {
		u32 tmp;
		__get_user_asm(tmp, (u32 __user *)src,
			       ret, "l", "k", "=r", 4);
		if (likely(!ret))
			__put_user_asm(tmp, (u32 __user *)dst,
				       ret, "l", "k", "ir", 4);
		return ret;
	}
	case 8: {
		u64 tmp;
		__get_user_asm(tmp, (u64 __user *)src,
			       ret, "q", "", "=r", 8);
		if (likely(!ret))
			__put_user_asm(tmp, (u64 __user *)dst,
				       ret, "q", "", "er", 8);
		return ret;
	}
	default:
		return copy_user_generic((__force void *)dst,
					 (__force void *)src, size);
	}
}

__must_check long
strncpy_from_user(char *dst, const char __user *src, long count);
__must_check long
__strncpy_from_user(char *dst, const char __user *src, long count);
__must_check long strnlen_user(const char __user *str, long n);
__must_check long __strnlen_user(const char __user *str, long n);
__must_check long strlen_user(const char __user *str);
__must_check unsigned long clear_user(void __user *mem, unsigned long len);
__must_check unsigned long __clear_user(void __user *mem, unsigned long len);

static __must_check __always_inline int
__copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
{
	return copy_user_generic(dst, (__force const void *)src, size);
}

static __must_check __always_inline int
__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
{
	return copy_user_generic((__force void *)dst, src, size);
}

extern long __copy_user_nocache(void *dst, const void __user *src,
				unsigned size, int zerorest);

static inline int
__copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
{
	might_sleep();
	return __copy_user_nocache(dst, src, size, 1);
}

static inline int
__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
				  unsigned size)
{
	return __copy_user_nocache(dst, src, size, 0);
}

unsigned long
copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);

#endif /* _ASM_X86_UACCESS_64_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_UACCESS_64_H
1965aae3 PA	2	#define _ASM_X86_UACCESS_64_H
1da177e4 LT	3
	4	/*
	5	* User space memory access functions
	6	*/
1da177e4 LT	7	#include <linux/compiler.h>
1da177e4 LT	8	#include <linux/errno.h>
16dbc6c9	9	#include <linux/lockdep.h>
1b1d9258 JB	10	#include <asm/alternative.h>
1b1d9258 JB	11	#include <asm/cpufeature.h>
1da177e4 LT	12	#include <asm/page.h>
1da177e4 LT	13
1da177e4 LT	14	/*
	15	* Copy To/From Userspace
	16	*/
	17
	18	/* Handles exceptions in both to and from, but doesn't do access_ok */
95912008	19	__must_check unsigned long
1b1d9258 JB	20	copy_user_generic_string(void to, const void from, unsigned len);
	21	__must_check unsigned long
	22	copy_user_generic_unrolled(void to, const void from, unsigned len);
	23
	24	static __always_inline __must_check unsigned long
	25	copy_user_generic(void to, const void from, unsigned len)
	26	{
	27	unsigned ret;
	28
	29	alternative_call(copy_user_generic_unrolled,
	30	copy_user_generic_string,
	31	X86_FEATURE_REP_GOOD,
	32	ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
	33	"=d" (len)),
	34	"1" (to), "2" (from), "3" (len)
	35	: "memory", "rcx", "r8", "r9", "r10", "r11");
	36	return ret;
	37	}
95912008 AK	38
95912008 AK	39	__must_check unsigned long
3c93ca00	40	_copy_to_user(void __user to, const void from, unsigned len);
95912008	41	__must_check unsigned long
9f0cf4ad	42	_copy_from_user(void to, const void __user from, unsigned len);
95912008 AK	43	__must_check unsigned long
	44	copy_in_user(void __user to, const void __user from, unsigned len);
	45
9f0cf4ad AV	46	static inline unsigned long __must_check copy_from_user(void *to,
	47	const void __user *from,
	48	unsigned long n)
	49	{
	50	int sz = __compiletime_object_size(to);
9f0cf4ad	51
3c93ca00	52	might_fault();
9f0cf4ad	53	if (likely(sz == -1 \|\| sz >= n))
409d02ef	54	n = _copy_from_user(to, from, n);
9f0cf4ad AV	55	#ifdef CONFIG_DEBUG_VM
	56	else
	57	WARN(1, "Buffer overflow detected!\n");
	58	#endif
409d02ef	59	return n;
9f0cf4ad AV	60	}
9f0cf4ad AV	61
3c93ca00 FW	62	static __always_inline __must_check
	63	int copy_to_user(void __user dst, const void src, unsigned size)
	64	{
	65	might_fault();
	66
	67	return _copy_to_user(dst, src, size);
	68	}
9f0cf4ad	69
95912008 AK	70	static __always_inline __must_check
95912008 AK	71	int __copy_from_user(void dst, const void __user src, unsigned size)
b896313e	72	{
383d079b	73	int ret = 0;
c10d38dd	74
3ee1afa3	75	might_fault();
1da177e4	76	if (!__builtin_constant_p(size))
b896313e JP	77	return copy_user_generic(dst, (__force void *)src, size);
	78	switch (size) {
	79	case 1:__get_user_asm((u8 )dst, (u8 __user *)src,
	80	ret, "b", "b", "=q", 1);
1da177e4	81	return ret;
b896313e JP	82	case 2:__get_user_asm((u16 )dst, (u16 __user *)src,
b896313e JP	83	ret, "w", "w", "=r", 2);
1da177e4	84	return ret;
b896313e JP	85	case 4:__get_user_asm((u32 )dst, (u32 __user *)src,
	86	ret, "l", "k", "=r", 4);
	87	return ret;
	88	case 8:__get_user_asm((u64 )dst, (u64 __user *)src,
	89	ret, "q", "", "=r", 8);
1da177e4	90	return ret;
1da177e4	91	case 10:
b896313e	92	__get_user_asm((u64 )dst, (u64 __user *)src,
20a4a236	93	ret, "q", "", "=r", 10);
b896313e JP	94	if (unlikely(ret))
	95	return ret;
	96	__get_user_asm((u16 )(8 + (char *)dst),
	97	(u16 __user )(8 + (char __user )src),
	98	ret, "w", "w", "=r", 2);
	99	return ret;
1da177e4	100	case 16:
b896313e JP	101	__get_user_asm((u64 )dst, (u64 __user *)src,
	102	ret, "q", "", "=r", 16);
	103	if (unlikely(ret))
	104	return ret;
	105	__get_user_asm((u64 )(8 + (char *)dst),
	106	(u64 __user )(8 + (char __user )src),
	107	ret, "q", "", "=r", 8);
	108	return ret;
1da177e4	109	default:
b896313e	110	return copy_user_generic(dst, (__force void *)src, size);
1da177e4	111	}
b896313e	112	}
1da177e4	113
95912008 AK	114	static __always_inline __must_check
95912008 AK	115	int __copy_to_user(void __user dst, const void src, unsigned size)
b896313e	116	{
383d079b	117	int ret = 0;
c10d38dd	118
3ee1afa3	119	might_fault();
1da177e4	120	if (!__builtin_constant_p(size))
b896313e JP	121	return copy_user_generic((__force void *)dst, src, size);
	122	switch (size) {
	123	case 1:__put_user_asm((u8 )src, (u8 __user *)dst,
	124	ret, "b", "b", "iq", 1);
1da177e4	125	return ret;
b896313e JP	126	case 2:__put_user_asm((u16 )src, (u16 __user *)dst,
b896313e JP	127	ret, "w", "w", "ir", 2);
1da177e4	128	return ret;
b896313e JP	129	case 4:__put_user_asm((u32 )src, (u32 __user *)dst,
	130	ret, "l", "k", "ir", 4);
	131	return ret;
	132	case 8:__put_user_asm((u64 )src, (u64 __user *)dst,
155b7352	133	ret, "q", "", "er", 8);
1da177e4	134	return ret;
1da177e4	135	case 10:
b896313e	136	__put_user_asm((u64 )src, (u64 __user *)dst,
155b7352	137	ret, "q", "", "er", 10);
b896313e JP	138	if (unlikely(ret))
b896313e JP	139	return ret;
1da177e4	140	asm("":::"memory");
b896313e JP	141	__put_user_asm(4[(u16 )src], 4 + (u16 __user )dst,
	142	ret, "w", "w", "ir", 2);
	143	return ret;
1da177e4	144	case 16:
b896313e	145	__put_user_asm((u64 )src, (u64 __user *)dst,
155b7352	146	ret, "q", "", "er", 16);
b896313e JP	147	if (unlikely(ret))
b896313e JP	148	return ret;
1da177e4	149	asm("":::"memory");
b896313e	150	__put_user_asm(1[(u64 )src], 1 + (u64 __user )dst,
155b7352	151	ret, "q", "", "er", 8);
b896313e	152	return ret;
1da177e4	153	default:
b896313e	154	return copy_user_generic((__force void *)dst, src, size);
1da177e4	155	}
b896313e	156	}
1da177e4	157
95912008 AK	158	static __always_inline __must_check
95912008 AK	159	int __copy_in_user(void __user dst, const void __user src, unsigned size)
b896313e	160	{
383d079b	161	int ret = 0;
c10d38dd	162
3ee1afa3	163	might_fault();
1da177e4	164	if (!__builtin_constant_p(size))
b896313e JP	165	return copy_user_generic((__force void *)dst,
	166	(__force void *)src, size);
	167	switch (size) {
	168	case 1: {
1da177e4	169	u8 tmp;
b896313e JP	170	__get_user_asm(tmp, (u8 __user *)src,
b896313e JP	171	ret, "b", "b", "=q", 1);
1da177e4	172	if (likely(!ret))
b896313e JP	173	__put_user_asm(tmp, (u8 __user *)dst,
b896313e JP	174	ret, "b", "b", "iq", 1);
1da177e4 LT	175	return ret;
1da177e4 LT	176	}
b896313e	177	case 2: {
1da177e4	178	u16 tmp;
b896313e JP	179	__get_user_asm(tmp, (u16 __user *)src,
b896313e JP	180	ret, "w", "w", "=r", 2);
1da177e4	181	if (likely(!ret))
b896313e JP	182	__put_user_asm(tmp, (u16 __user *)dst,
b896313e JP	183	ret, "w", "w", "ir", 2);
1da177e4 LT	184	return ret;
	185	}
	186
b896313e	187	case 4: {
1da177e4	188	u32 tmp;
b896313e JP	189	__get_user_asm(tmp, (u32 __user *)src,
b896313e JP	190	ret, "l", "k", "=r", 4);
1da177e4	191	if (likely(!ret))
b896313e JP	192	__put_user_asm(tmp, (u32 __user *)dst,
b896313e JP	193	ret, "l", "k", "ir", 4);
1da177e4 LT	194	return ret;
1da177e4 LT	195	}
b896313e	196	case 8: {
1da177e4	197	u64 tmp;
b896313e JP	198	__get_user_asm(tmp, (u64 __user *)src,
b896313e JP	199	ret, "q", "", "=r", 8);
1da177e4	200	if (likely(!ret))
b896313e	201	__put_user_asm(tmp, (u64 __user *)dst,
155b7352	202	ret, "q", "", "er", 8);
1da177e4 LT	203	return ret;
	204	}
	205	default:
b896313e JP	206	return copy_user_generic((__force void *)dst,
b896313e JP	207	(__force void *)src, size);
1da177e4	208	}
b896313e	209	}
1da177e4	210
b896313e	211	__must_check long
95912008	212	strncpy_from_user(char dst, const char __user src, long count);
b896313e	213	__must_check long
95912008 AK	214	__strncpy_from_user(char dst, const char __user src, long count);
	215	__must_check long strnlen_user(const char __user *str, long n);
	216	__must_check long __strnlen_user(const char __user *str, long n);
	217	__must_check long strlen_user(const char __user *str);
	218	__must_check unsigned long clear_user(void __user *mem, unsigned long len);
	219	__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
	220
14722485 JB	221	static __must_check __always_inline int
	222	__copy_from_user_inatomic(void dst, const void __user src, unsigned size)
	223	{
	224	return copy_user_generic(dst, (__force const void *)src, size);
	225	}
b885808e AK	226
	227	static __must_check __always_inline int
	228	__copy_to_user_inatomic(void __user dst, const void src, unsigned size)
	229	{
	230	return copy_user_generic((__force void *)dst, src, size);
	231	}
1da177e4	232
b896313e JP	233	extern long __copy_user_nocache(void dst, const void __user src,
b896313e JP	234	unsigned size, int zerorest);
0812a579	235
f1800536 IM	236	static inline int
f1800536 IM	237	__copy_from_user_nocache(void dst, const void __user src, unsigned size)
0812a579 AK	238	{
0812a579 AK	239	might_sleep();
f1800536	240	return __copy_user_nocache(dst, src, size, 1);
0812a579 AK	241	}
0812a579 AK	242
f1800536 IM	243	static inline int
	244	__copy_from_user_inatomic_nocache(void dst, const void __user src,
	245	unsigned size)
0812a579	246	{
f1800536	247	return __copy_user_nocache(dst, src, size, 0);
0812a579 AK	248	}
0812a579 AK	249
1129585a VM	250	unsigned long
	251	copy_user_handle_tail(char to, char from, unsigned len, unsigned zerorest);
	252
1965aae3	253	#endif /* _ASM_X86_UACCESS_64_H */