[deliverable/linux.git] / arch / x86 / include / asm / uaccess.h

#ifndef _ASM_X86_UACCESS_H
#define _ASM_X86_UACCESS_H
/*
 * User space memory access functions
 */
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
#include <linux/prefetch.h>
#include <linux/string.h>
#include <asm/asm.h>
#include <asm/page.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, these macros are grossly misnamed.
 */

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

#define KERNEL_DS	MAKE_MM_SEG(-1UL)
#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current_thread_info()->addr_limit)
#define set_fs(x)	(current_thread_info()->addr_limit = (x))

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

#define __addr_ok(addr)					\
	((unsigned long __force)(addr) <		\
	 (current_thread_info()->addr_limit.seg))

/*
 * Test whether a block of memory is a valid user space address.
 * Returns 0 if the range is valid, nonzero otherwise.
 *
 * This is equivalent to the following test:
 * (u33)addr + (u33)size >= (u33)current->addr_limit.seg (u65 for x86_64)
 *
 * This needs 33-bit (65-bit for x86_64) arithmetic. We have a carry...
 */

#define __range_not_ok(addr, size)					\
({									\
	unsigned long flag, roksum;					\
	__chk_user_ptr(addr);						\
	asm("add %3,%1 ; sbb %0,%0 ; cmp %1,%4 ; sbb $0,%0"		\
	    : "=&r" (flag), "=r" (roksum)				\
	    : "1" (addr), "g" ((long)(size)),				\
	      "rm" (current_thread_info()->addr_limit.seg));		\
	flag;								\
})

/**
 * access_ok: - Checks if a user space pointer is valid
 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE.  Note that
 *        %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
 *        to write to a block, it is always safe to read from it.
 * @addr: User space pointer to start of block to check
 * @size: Size of block to check
 *
 * Context: User context only.  This function may sleep.
 *
 * Checks if a pointer to a block of memory in user space is valid.
 *
 * Returns true (nonzero) if the memory block may be valid, false (zero)
 * if it is definitely invalid.
 *
 * Note that, depending on architecture, this function probably just
 * checks that the pointer is in the user space range - after calling
 * this function, memory access functions may still return -EFAULT.
 */
#define access_ok(type, addr, size) (likely(__range_not_ok(addr, size) == 0))

/*
 * 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 are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 *
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 */

extern int __get_user_1(void);
extern int __get_user_2(void);
extern int __get_user_4(void);
extern int __get_user_8(void);
extern int __get_user_bad(void);

#define __get_user_x(size, ret, x, ptr)		      \
	asm volatile("call __get_user_" #size	      \
		     : "=a" (ret),"=d" (x)	      \
		     : "0" (ptr))		      \

/* Careful: we have to cast the result to the type of the pointer
 * for sign reasons */

/**
 * get_user: - Get a simple variable from user space.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only.  This function may sleep.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */
#ifdef CONFIG_X86_32
#define __get_user_8(__ret_gu, __val_gu, ptr)				\
		__get_user_x(X, __ret_gu, __val_gu, ptr)
#else
#define __get_user_8(__ret_gu, __val_gu, ptr)				\
		__get_user_x(8, __ret_gu, __val_gu, ptr)
#endif

#define get_user(x, ptr)						\
({									\
	int __ret_gu;							\
	unsigned long __val_gu;						\
	__chk_user_ptr(ptr);						\
	might_fault();							\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		__get_user_x(1, __ret_gu, __val_gu, ptr);		\
		break;							\
	case 2:								\
		__get_user_x(2, __ret_gu, __val_gu, ptr);		\
		break;							\
	case 4:								\
		__get_user_x(4, __ret_gu, __val_gu, ptr);		\
		break;							\
	case 8:								\
		__get_user_8(__ret_gu, __val_gu, ptr);			\
		break;							\
	default:							\
		__get_user_x(X, __ret_gu, __val_gu, ptr);		\
		break;							\
	}								\
	(x) = (__typeof__(*(ptr)))__val_gu;				\
	__ret_gu;							\
})

#define __put_user_x(size, x, ptr, __ret_pu)			\
	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
		     :"0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")


#ifdef CONFIG_X86_32
#define __put_user_u64(x, addr, err)					\
	asm volatile("1:	movl %%eax,0(%2)\n"			\
		     "2:	movl %%edx,4(%2)\n"			\
		     "3:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "4:	movl %3,%0\n"				\
		     "	jmp 3b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 4b)				\
		     _ASM_EXTABLE(2b, 4b)				\
		     : "=r" (err)					\
		     : "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))

#define __put_user_x8(x, ptr, __ret_pu)				\
	asm volatile("call __put_user_8" : "=a" (__ret_pu)	\
		     : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#else
#define __put_user_u64(x, ptr, retval) \
	__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT)
#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
#endif

extern void __put_user_bad(void);

/*
 * Strange magic calling convention: pointer in %ecx,
 * value in %eax(:%edx), return value in %eax. clobbers %rbx
 */
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);

#ifdef CONFIG_X86_WP_WORKS_OK

/**
 * put_user: - Write a simple value into user space.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only.  This function may sleep.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Returns zero on success, or -EFAULT on error.
 */
#define put_user(x, ptr)					\
({								\
	int __ret_pu;						\
	__typeof__(*(ptr)) __pu_val;				\
	__chk_user_ptr(ptr);					\
	might_fault();						\
	__pu_val = x;						\
	switch (sizeof(*(ptr))) {				\
	case 1:							\
		__put_user_x(1, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 2:							\
		__put_user_x(2, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 4:							\
		__put_user_x(4, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 8:							\
		__put_user_x8(__pu_val, ptr, __ret_pu);		\
		break;						\
	default:						\
		__put_user_x(X, __pu_val, ptr, __ret_pu);	\
		break;						\
	}							\
	__ret_pu;						\
})

#define __put_user_size(x, ptr, size, retval, errret)			\
do {									\
	retval = 0;							\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__put_user_asm(x, ptr, retval, "b", "b", "iq", errret);	\
		break;							\
	case 2:								\
		__put_user_asm(x, ptr, retval, "w", "w", "ir", errret);	\
		break;							\
	case 4:								\
		__put_user_asm(x, ptr, retval, "l", "k",  "ir", errret);\
		break;							\
	case 8:								\
		__put_user_u64((__typeof__(*ptr))(x), ptr, retval);	\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

#else

#define __put_user_size(x, ptr, size, retval, errret)			\
do {									\
	__typeof__(*(ptr))__pus_tmp = x;				\
	retval = 0;							\
									\
	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0))	\
		retval = errret;					\
} while (0)

#define put_user(x, ptr)					\
({								\
	int __ret_pu;						\
	__typeof__(*(ptr))__pus_tmp = x;			\
	__ret_pu = 0;						\
	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp,		\
				       sizeof(*(ptr))) != 0))	\
		__ret_pu = -EFAULT;				\
	__ret_pu;						\
})
#endif

#ifdef CONFIG_X86_32
#define __get_user_asm_u64(x, ptr, retval, errret)	(x) = __get_user_bad()
#else
#define __get_user_asm_u64(x, ptr, retval, errret) \
	 __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
#endif

#define __get_user_size(x, ptr, size, retval, errret)			\
do {									\
	retval = 0;							\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__get_user_asm(x, ptr, retval, "b", "b", "=q", errret);	\
		break;							\
	case 2:								\
		__get_user_asm(x, ptr, retval, "w", "w", "=r", errret);	\
		break;							\
	case 4:								\
		__get_user_asm(x, ptr, retval, "l", "k", "=r", errret);	\
		break;							\
	case 8:								\
		__get_user_asm_u64(x, ptr, retval, errret);		\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("1:	mov"itype" %2,%"rtype"1\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	xor"itype" %"rtype"1,%"rtype"1\n"		\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 3b)				\
		     : "=r" (err), ltype(x)				\
		     : "m" (__m(addr)), "i" (errret), "0" (err))

#define __put_user_nocheck(x, ptr, size)			\
({								\
	int __pu_err;						\
	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT);	\
	__pu_err;						\
})

#define __get_user_nocheck(x, ptr, size)				\
({									\
	int __gu_err;							\
	unsigned long __gu_val;						\
	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
	__gu_err;							\
})

/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))

/*
 * Tell gcc we read from memory instead of writing: this is because
 * we do not write to any memory gcc knows about, so there are no
 * aliasing issues.
 */
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("1:	mov"itype" %"rtype"1,%2\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 3b)				\
		     : "=r"(err)					\
		     : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
/**
 * __get_user: - Get a simple variable from user space, with less checking.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only.  This function may sleep.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Caller must check the pointer with access_ok() before calling this
 * function.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */

#define __get_user(x, ptr)						\
	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
/**
 * __put_user: - Write a simple value into user space, with less checking.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only.  This function may sleep.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Caller must check the pointer with access_ok() before calling this
 * function.
 *
 * Returns zero on success, or -EFAULT on error.
 */

#define __put_user(x, ptr)						\
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user

/*
 * movsl can be slow when source and dest are not both 8-byte aligned
 */
#ifdef CONFIG_X86_INTEL_USERCOPY
extern struct movsl_mask {
	int mask;
} ____cacheline_aligned_in_smp movsl_mask;
#endif

#define ARCH_HAS_NOCACHE_UACCESS 1

#ifdef CONFIG_X86_32
# include "uaccess_32.h"
#else
# define ARCH_HAS_SEARCH_EXTABLE
# include "uaccess_64.h"
#endif

#endif /* _ASM_X86_UACCESS_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_UACCESS_H
1965aae3 PA	2	#define _ASM_X86_UACCESS_H
ca233862 GC	3	/*
	4	* User space memory access functions
	5	*/
	6	#include <linux/errno.h>
	7	#include <linux/compiler.h>
	8	#include <linux/thread_info.h>
	9	#include <linux/prefetch.h>
	10	#include <linux/string.h>
	11	#include <asm/asm.h>
	12	#include <asm/page.h>
	13
	14	#define VERIFY_READ 0
	15	#define VERIFY_WRITE 1
	16
	17	/*
	18	* The fs value determines whether argument validity checking should be
	19	* performed or not. If get_fs() == USER_DS, checking is performed, with
	20	* get_fs() == KERNEL_DS, checking is bypassed.
	21	*
	22	* For historical reasons, these macros are grossly misnamed.
	23	*/
	24
	25	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	26
	27	#define KERNEL_DS MAKE_MM_SEG(-1UL)
	28	#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
	29
	30	#define get_ds() (KERNEL_DS)
	31	#define get_fs() (current_thread_info()->addr_limit)
	32	#define set_fs(x) (current_thread_info()->addr_limit = (x))
	33
	34	#define segment_eq(a, b) ((a).seg == (b).seg)
	35
002ca169 GC	36	#define __addr_ok(addr) \
	37	((unsigned long __force)(addr) < \
	38	(current_thread_info()->addr_limit.seg))
	39
ca233862 GC	40	/*
	41	* Test whether a block of memory is a valid user space address.
	42	* Returns 0 if the range is valid, nonzero otherwise.
	43	*
	44	* This is equivalent to the following test:
	45	* (u33)addr + (u33)size >= (u33)current->addr_limit.seg (u65 for x86_64)
	46	*
	47	* This needs 33-bit (65-bit for x86_64) arithmetic. We have a carry...
	48	*/
	49
	50	#define __range_not_ok(addr, size) \
	51	({ \
	52	unsigned long flag, roksum; \
	53	__chk_user_ptr(addr); \
	54	asm("add %3,%1 ; sbb %0,%0 ; cmp %1,%4 ; sbb $0,%0" \
	55	: "=&r" (flag), "=r" (roksum) \
	56	: "1" (addr), "g" ((long)(size)), \
	57	"rm" (current_thread_info()->addr_limit.seg)); \
	58	flag; \
	59	})
	60
	61	/**
	62	* access_ok: - Checks if a user space pointer is valid
	63	* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
	64	* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
	65	* to write to a block, it is always safe to read from it.
	66	* @addr: User space pointer to start of block to check
	67	* @size: Size of block to check
	68	*
	69	* Context: User context only. This function may sleep.
	70	*
	71	* Checks if a pointer to a block of memory in user space is valid.
	72	*
	73	* Returns true (nonzero) if the memory block may be valid, false (zero)
	74	* if it is definitely invalid.
	75	*
	76	* Note that, depending on architecture, this function probably just
	77	* checks that the pointer is in the user space range - after calling
	78	* this function, memory access functions may still return -EFAULT.
	79	*/
	80	#define access_ok(type, addr, size) (likely(__range_not_ok(addr, size) == 0))
	81
	82	/*
	83	* The exception table consists of pairs of addresses: the first is the
	84	* address of an instruction that is allowed to fault, and the second is
	85	* the address at which the program should continue. No registers are
	86	* modified, so it is entirely up to the continuation code to figure out
	87	* what to do.
	88	*
	89	* All the routines below use bits of fixup code that are out of line
	90	* with the main instruction path. This means when everything is well,
	91	* we don't even have to jump over them. Further, they do not intrude
	92	* on our cache or tlb entries.
	93	*/
	94
	95	struct exception_table_entry {
	96	unsigned long insn, fixup;
	97	};
	98
	99	extern int fixup_exception(struct pt_regs *regs);
	100
	101	/*
	102	* These are the main single-value transfer routines. They automatically
	103	* use the right size if we just have the right pointer type.
104	*
105	* This gets kind of ugly. We want to return _two_ values in "get_user()"
106	* and yet we don't want to do any pointers, because that is too much
107	* of a performance impact. Thus we have a few rather ugly macros here,
108	* and hide all the ugliness from the user.
109	*
110	* The "__xxx" versions of the user access functions are versions that
111	* do not verify the address space, that must have been done previously
112	* with a separate "access_ok()" call (this is used when we do multiple
113	* accesses to the same area of user memory).
114	*/
115
116	extern int __get_user_1(void);
117	extern int __get_user_2(void);
118	extern int __get_user_4(void);
119	extern int __get_user_8(void);
120	extern int __get_user_bad(void);
121
122	#define __get_user_x(size, ret, x, ptr) \
123	asm volatile("call __get_user_" #size \
124	: "=a" (ret),"=d" (x) \
125	: "0" (ptr)) \
126
865e5b76 GC	127	/* Careful: we have to cast the result to the type of the pointer
	128	* for sign reasons */
	129
	130	/**
	131	* get_user: - Get a simple variable from user space.
	132	* @x: Variable to store result.
	133	* @ptr: Source address, in user space.
	134	*
	135	* Context: User context only. This function may sleep.
	136	*
	137	* This macro copies a single simple variable from user space to kernel
	138	* space. It supports simple types like char and int, but not larger
	139	* data types like structures or arrays.
	140	*
	141	* @ptr must have pointer-to-simple-variable type, and the result of
	142	* dereferencing @ptr must be assignable to @x without a cast.
	143	*
	144	* Returns zero on success, or -EFAULT on error.
	145	* On error, the variable @x is set to zero.
	146	*/
	147	#ifdef CONFIG_X86_32
	148	#define __get_user_8(__ret_gu, __val_gu, ptr) \
	149	__get_user_x(X, __ret_gu, __val_gu, ptr)
	150	#else
	151	#define __get_user_8(__ret_gu, __val_gu, ptr) \
	152	__get_user_x(8, __ret_gu, __val_gu, ptr)
	153	#endif
	154
	155	#define get_user(x, ptr) \
	156	({ \
	157	int __ret_gu; \
	158	unsigned long __val_gu; \
	159	__chk_user_ptr(ptr); \
3ee1afa3	160	might_fault(); \
865e5b76 GC	161	switch (sizeof(*(ptr))) { \
	162	case 1: \
	163	__get_user_x(1, __ret_gu, __val_gu, ptr); \
	164	break; \
	165	case 2: \
	166	__get_user_x(2, __ret_gu, __val_gu, ptr); \
	167	break; \
	168	case 4: \
	169	__get_user_x(4, __ret_gu, __val_gu, ptr); \
	170	break; \
	171	case 8: \
	172	__get_user_8(__ret_gu, __val_gu, ptr); \
	173	break; \
	174	default: \
	175	__get_user_x(X, __ret_gu, __val_gu, ptr); \
	176	break; \
	177	} \
	178	(x) = (__typeof__(*(ptr)))__val_gu; \
	179	__ret_gu; \
	180	})
	181
e30a44fd GC	182	#define __put_user_x(size, x, ptr, __ret_pu) \
	183	asm volatile("call __put_user_" #size : "=a" (__ret_pu) \
	184	:"0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
	185
	186
	187
dc70ddf4 GC	188	#ifdef CONFIG_X86_32
	189	#define __put_user_u64(x, addr, err) \
	190	asm volatile("1: movl %%eax,0(%2)\n" \
	191	"2: movl %%edx,4(%2)\n" \
	192	"3:\n" \
	193	".section .fixup,\"ax\"\n" \
	194	"4: movl %3,%0\n" \
	195	" jmp 3b\n" \
	196	".previous\n" \
	197	_ASM_EXTABLE(1b, 4b) \
	198	_ASM_EXTABLE(2b, 4b) \
	199	: "=r" (err) \
	200	: "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))
e30a44fd GC	201
	202	#define __put_user_x8(x, ptr, __ret_pu) \
	203	asm volatile("call __put_user_8" : "=a" (__ret_pu) \
	204	: "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
dc70ddf4 GC	205	#else
	206	#define __put_user_u64(x, ptr, retval) \
	207	__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT)
e30a44fd	208	#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
dc70ddf4 GC	209	#endif
dc70ddf4 GC	210
e30a44fd GC	211	extern void __put_user_bad(void);
	212
	213	/*
	214	* Strange magic calling convention: pointer in %ecx,
	215	* value in %eax(:%edx), return value in %eax. clobbers %rbx
	216	*/
	217	extern void __put_user_1(void);
	218	extern void __put_user_2(void);
	219	extern void __put_user_4(void);
	220	extern void __put_user_8(void);
	221
dc70ddf4 GC	222	#ifdef CONFIG_X86_WP_WORKS_OK
dc70ddf4 GC	223
e30a44fd GC	224	/**
	225	* put_user: - Write a simple value into user space.
	226	* @x: Value to copy to user space.
	227	* @ptr: Destination address, in user space.
	228	*
	229	* Context: User context only. This function may sleep.
	230	*
	231	* This macro copies a single simple value from kernel space to user
	232	* space. It supports simple types like char and int, but not larger
	233	* data types like structures or arrays.
	234	*
	235	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	236	* to the result of dereferencing @ptr.
	237	*
	238	* Returns zero on success, or -EFAULT on error.
	239	*/
	240	#define put_user(x, ptr) \
	241	({ \
	242	int __ret_pu; \
	243	__typeof__(*(ptr)) __pu_val; \
	244	__chk_user_ptr(ptr); \
3ee1afa3	245	might_fault(); \
e30a44fd GC	246	__pu_val = x; \
	247	switch (sizeof(*(ptr))) { \
	248	case 1: \
	249	__put_user_x(1, __pu_val, ptr, __ret_pu); \
	250	break; \
	251	case 2: \
	252	__put_user_x(2, __pu_val, ptr, __ret_pu); \
	253	break; \
	254	case 4: \
	255	__put_user_x(4, __pu_val, ptr, __ret_pu); \
	256	break; \
	257	case 8: \
	258	__put_user_x8(__pu_val, ptr, __ret_pu); \
	259	break; \
	260	default: \
	261	__put_user_x(X, __pu_val, ptr, __ret_pu); \
	262	break; \
	263	} \
	264	__ret_pu; \
	265	})
	266
dc70ddf4 GC	267	#define __put_user_size(x, ptr, size, retval, errret) \
	268	do { \
	269	retval = 0; \
	270	__chk_user_ptr(ptr); \
	271	switch (size) { \
	272	case 1: \
	273	__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
	274	break; \
	275	case 2: \
	276	__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
	277	break; \
	278	case 4: \
	279	__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);\
	280	break; \
	281	case 8: \
	282	__put_user_u64((__typeof__(*ptr))(x), ptr, retval); \
	283	break; \
	284	default: \
	285	__put_user_bad(); \
	286	} \
	287	} while (0)
	288
	289	#else
	290
	291	#define __put_user_size(x, ptr, size, retval, errret) \
	292	do { \
	293	__typeof__(*(ptr))__pus_tmp = x; \
	294	retval = 0; \
	295	\
	296	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
	297	retval = errret; \
	298	} while (0)
	299
e30a44fd GC	300	#define put_user(x, ptr) \
	301	({ \
	302	int __ret_pu; \
	303	__typeof__(*(ptr))__pus_tmp = x; \
	304	__ret_pu = 0; \
	305	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \
	306	sizeof(*(ptr))) != 0)) \
	307	__ret_pu = -EFAULT; \
	308	__ret_pu; \
	309	})
dc70ddf4 GC	310	#endif
dc70ddf4 GC	311
3f168221 GC	312	#ifdef CONFIG_X86_32
	313	#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad()
	314	#else
	315	#define __get_user_asm_u64(x, ptr, retval, errret) \
	316	__get_user_asm(x, ptr, retval, "q", "", "=r", errret)
	317	#endif
	318
	319	#define __get_user_size(x, ptr, size, retval, errret) \
	320	do { \
	321	retval = 0; \
	322	__chk_user_ptr(ptr); \
	323	switch (size) { \
	324	case 1: \
	325	__get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
	326	break; \
	327	case 2: \
	328	__get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
	329	break; \
	330	case 4: \
	331	__get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \
	332	break; \
	333	case 8: \
	334	__get_user_asm_u64(x, ptr, retval, errret); \
	335	break; \
	336	default: \
	337	(x) = __get_user_bad(); \
	338	} \
	339	} while (0)
	340
	341	#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \
	342	asm volatile("1: mov"itype" %2,%"rtype"1\n" \
	343	"2:\n" \
	344	".section .fixup,\"ax\"\n" \
	345	"3: mov %3,%0\n" \
	346	" xor"itype" %"rtype"1,%"rtype"1\n" \
	347	" jmp 2b\n" \
	348	".previous\n" \
	349	_ASM_EXTABLE(1b, 3b) \
	350	: "=r" (err), ltype(x) \
	351	: "m" (__m(addr)), "i" (errret), "0" (err))
	352
dc70ddf4 GC	353	#define __put_user_nocheck(x, ptr, size) \
dc70ddf4 GC	354	({ \
16855f87	355	int __pu_err; \
dc70ddf4 GC	356	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
	357	__pu_err; \
	358	})
	359
3f168221 GC	360	#define __get_user_nocheck(x, ptr, size) \
3f168221 GC	361	({ \
16855f87	362	int __gu_err; \
3f168221 GC	363	unsigned long __gu_val; \
	364	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
	365	(x) = (__force __typeof__(*(ptr)))__gu_val; \
	366	__gu_err; \
	367	})
dc70ddf4 GC	368
	369	/* FIXME: this hack is definitely wrong -AK */
	370	struct __large_struct { unsigned long buf[100]; };
	371	#define __m(x) ((struct __large_struct __user )(x))
	372
	373	/*
	374	* Tell gcc we read from memory instead of writing: this is because
	375	* we do not write to any memory gcc knows about, so there are no
	376	* aliasing issues.
	377	*/
	378	#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
	379	asm volatile("1: mov"itype" %"rtype"1,%2\n" \
	380	"2:\n" \
	381	".section .fixup,\"ax\"\n" \
	382	"3: mov %3,%0\n" \
	383	" jmp 2b\n" \
	384	".previous\n" \
	385	_ASM_EXTABLE(1b, 3b) \
	386	: "=r"(err) \
	387	: ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
8cb834e9 GC	388	/**
	389	* __get_user: - Get a simple variable from user space, with less checking.
	390	* @x: Variable to store result.
	391	* @ptr: Source address, in user space.
	392	*
	393	* Context: User context only. This function may sleep.
	394	*
	395	* This macro copies a single simple variable from user space to kernel
	396	* space. It supports simple types like char and int, but not larger
	397	* data types like structures or arrays.
	398	*
	399	* @ptr must have pointer-to-simple-variable type, and the result of
	400	* dereferencing @ptr must be assignable to @x without a cast.
	401	*
	402	* Caller must check the pointer with access_ok() before calling this
	403	* function.
	404	*
	405	* Returns zero on success, or -EFAULT on error.
	406	* On error, the variable @x is set to zero.
	407	*/
	408
	409	#define __get_user(x, ptr) \
	410	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	411	/**
	412	* __put_user: - Write a simple value into user space, with less checking.
	413	* @x: Value to copy to user space.
	414	* @ptr: Destination address, in user space.
	415	*
	416	* Context: User context only. This function may sleep.
	417	*
	418	* This macro copies a single simple value from kernel space to user
	419	* space. It supports simple types like char and int, but not larger
	420	* data types like structures or arrays.
	421	*
	422	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	423	* to the result of dereferencing @ptr.
	424	*
	425	* Caller must check the pointer with access_ok() before calling this
	426	* function.
	427	*
	428	* Returns zero on success, or -EFAULT on error.
	429	*/
	430
	431	#define __put_user(x, ptr) \
	432	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
dc70ddf4	433
8cb834e9 GC	434	#define __get_user_unaligned __get_user
8cb834e9 GC	435	#define __put_user_unaligned __put_user
865e5b76	436
8bc7de0c GC	437	/*
	438	* movsl can be slow when source and dest are not both 8-byte aligned
	439	*/
	440	#ifdef CONFIG_X86_INTEL_USERCOPY
	441	extern struct movsl_mask {
	442	int mask;
	443	} ____cacheline_aligned_in_smp movsl_mask;
	444	#endif
	445
22cac167 GC	446	#define ARCH_HAS_NOCACHE_UACCESS 1
22cac167 GC	447
96a388de TG	448	#ifdef CONFIG_X86_32
	449	# include "uaccess_32.h"
	450	#else
22cac167	451	# define ARCH_HAS_SEARCH_EXTABLE
96a388de TG	452	# include "uaccess_64.h"
96a388de TG	453	#endif
ca233862	454
1965aae3	455	#endif /* _ASM_X86_UACCESS_H */
8174c430	456