[linux-2.6-block.git] / include / asm-x86 / uaccess.h

#ifndef _ASM_UACCES_H_
#define _ASM_UACCES_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 <linux/lockdep.h>
#include <linux/sched.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_sleep();							\
	if (current->mm)						\
		might_lock_read(&current->mm->mmap_sem);		\
	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_sleep();						\
	if (current->mm)					\
		might_lock_read(&current->mm->mmap_sem);	\
	__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;							\
	might_sleep();							\
	if (current->mm)						\
		might_lock_read(&current->mm->mmap_sem);		\
	__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;							\
	might_sleep();							\
	if (current->mm)						\
		might_lock_read(&current->mm->mmap_sem);		\
	__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)			\
({								\
	long __pu_err;						\
	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT);	\
	__pu_err;						\
})

#define __get_user_nocheck(x, ptr, size)				\
({									\
	long __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
Commit	Line	Data
ca233862 GC	1	#ifndef _ASM_UACCES_H_
	2	#define _ASM_UACCES_H_
	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>
c10d38dd NP	11	#include <linux/lockdep.h>
c10d38dd NP	12	#include <linux/sched.h>
ca233862 GC	13	#include <asm/asm.h>
	14	#include <asm/page.h>
	15
	16	#define VERIFY_READ 0
	17	#define VERIFY_WRITE 1
	18
	19	/*
	20	* The fs value determines whether argument validity checking should be
	21	* performed or not. If get_fs() == USER_DS, checking is performed, with
	22	* get_fs() == KERNEL_DS, checking is bypassed.
	23	*
	24	* For historical reasons, these macros are grossly misnamed.
	25	*/
	26
	27	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	28
	29	#define KERNEL_DS MAKE_MM_SEG(-1UL)
	30	#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
	31
	32	#define get_ds() (KERNEL_DS)
	33	#define get_fs() (current_thread_info()->addr_limit)
	34	#define set_fs(x) (current_thread_info()->addr_limit = (x))
	35
	36	#define segment_eq(a, b) ((a).seg == (b).seg)
	37
002ca169 GC	38	#define __addr_ok(addr) \
	39	((unsigned long __force)(addr) < \
	40	(current_thread_info()->addr_limit.seg))
	41
ca233862 GC	42	/*
	43	* Test whether a block of memory is a valid user space address.
	44	* Returns 0 if the range is valid, nonzero otherwise.
	45	*
	46	* This is equivalent to the following test:
	47	* (u33)addr + (u33)size >= (u33)current->addr_limit.seg (u65 for x86_64)
	48	*
	49	* This needs 33-bit (65-bit for x86_64) arithmetic. We have a carry...
	50	*/
	51
	52	#define __range_not_ok(addr, size) \
	53	({ \
	54	unsigned long flag, roksum; \
	55	__chk_user_ptr(addr); \
	56	asm("add %3,%1 ; sbb %0,%0 ; cmp %1,%4 ; sbb $0,%0" \
	57	: "=&r" (flag), "=r" (roksum) \
	58	: "1" (addr), "g" ((long)(size)), \
	59	"rm" (current_thread_info()->addr_limit.seg)); \
	60	flag; \
	61	})
	62
	63	/**
	64	* access_ok: - Checks if a user space pointer is valid
	65	* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
	66	* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
	67	* to write to a block, it is always safe to read from it.
	68	* @addr: User space pointer to start of block to check
	69	* @size: Size of block to check
	70	*
	71	* Context: User context only. This function may sleep.
	72	*
	73	* Checks if a pointer to a block of memory in user space is valid.
	74	*
	75	* Returns true (nonzero) if the memory block may be valid, false (zero)
	76	* if it is definitely invalid.
	77	*
	78	* Note that, depending on architecture, this function probably just
	79	* checks that the pointer is in the user space range - after calling
	80	* this function, memory access functions may still return -EFAULT.
	81	*/
	82	#define access_ok(type, addr, size) (likely(__range_not_ok(addr, size) == 0))
	83
	84	/*
	85	* The exception table consists of pairs of addresses: the first is the
	86	* address of an instruction that is allowed to fault, and the second is
	87	* the address at which the program should continue. No registers are
	88	* modified, so it is entirely up to the continuation code to figure out
	89	* what to do.
	90	*
	91	* All the routines below use bits of fixup code that are out of line
	92	* with the main instruction path. This means when everything is well,
	93	* we don't even have to jump over them. Further, they do not intrude
	94	* on our cache or tlb entries.
	95	*/
	96
	97	struct exception_table_entry {
	98	unsigned long insn, fixup;
	99	};
	100
	101	extern int fixup_exception(struct pt_regs *regs);
	102
	103	/*
	104	* These are the main single-value transfer routines. They automatically
	105	* use the right size if we just have the right pointer type.
106	*
107	* This gets kind of ugly. We want to return _two_ values in "get_user()"
108	* and yet we don't want to do any pointers, because that is too much
109	* of a performance impact. Thus we have a few rather ugly macros here,
110	* and hide all the ugliness from the user.
111	*
112	* The "__xxx" versions of the user access functions are versions that
113	* do not verify the address space, that must have been done previously
114	* with a separate "access_ok()" call (this is used when we do multiple
115	* accesses to the same area of user memory).
116	*/
117
118	extern int __get_user_1(void);
119	extern int __get_user_2(void);
120	extern int __get_user_4(void);
121	extern int __get_user_8(void);
122	extern int __get_user_bad(void);
123
124	#define __get_user_x(size, ret, x, ptr) \
125	asm volatile("call __get_user_" #size \
126	: "=a" (ret),"=d" (x) \
127	: "0" (ptr)) \
128
865e5b76 GC	129	/* Careful: we have to cast the result to the type of the pointer
	130	* for sign reasons */
	131
	132	/**
	133	* get_user: - Get a simple variable from user space.
	134	* @x: Variable to store result.
	135	* @ptr: Source address, in user space.
	136	*
	137	* Context: User context only. This function may sleep.
	138	*
	139	* This macro copies a single simple variable from user space to kernel
	140	* space. It supports simple types like char and int, but not larger
	141	* data types like structures or arrays.
	142	*
	143	* @ptr must have pointer-to-simple-variable type, and the result of
	144	* dereferencing @ptr must be assignable to @x without a cast.
	145	*
	146	* Returns zero on success, or -EFAULT on error.
	147	* On error, the variable @x is set to zero.
	148	*/
	149	#ifdef CONFIG_X86_32
	150	#define __get_user_8(__ret_gu, __val_gu, ptr) \
	151	__get_user_x(X, __ret_gu, __val_gu, ptr)
	152	#else
	153	#define __get_user_8(__ret_gu, __val_gu, ptr) \
	154	__get_user_x(8, __ret_gu, __val_gu, ptr)
	155	#endif
	156
	157	#define get_user(x, ptr) \
	158	({ \
	159	int __ret_gu; \
	160	unsigned long __val_gu; \
	161	__chk_user_ptr(ptr); \
c10d38dd NP	162	might_sleep(); \
	163	if (current->mm) \
	164	might_lock_read(&current->mm->mmap_sem); \
865e5b76 GC	165	switch (sizeof(*(ptr))) { \
	166	case 1: \
	167	__get_user_x(1, __ret_gu, __val_gu, ptr); \
	168	break; \
	169	case 2: \
	170	__get_user_x(2, __ret_gu, __val_gu, ptr); \
	171	break; \
	172	case 4: \
	173	__get_user_x(4, __ret_gu, __val_gu, ptr); \
	174	break; \
	175	case 8: \
	176	__get_user_8(__ret_gu, __val_gu, ptr); \
	177	break; \
	178	default: \
	179	__get_user_x(X, __ret_gu, __val_gu, ptr); \
	180	break; \
	181	} \
	182	(x) = (__typeof__(*(ptr)))__val_gu; \
	183	__ret_gu; \
	184	})
	185
e30a44fd GC	186	#define __put_user_x(size, x, ptr, __ret_pu) \
	187	asm volatile("call __put_user_" #size : "=a" (__ret_pu) \
	188	:"0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
	189
	190
	191
dc70ddf4 GC	192	#ifdef CONFIG_X86_32
	193	#define __put_user_u64(x, addr, err) \
	194	asm volatile("1: movl %%eax,0(%2)\n" \
	195	"2: movl %%edx,4(%2)\n" \
	196	"3:\n" \
	197	".section .fixup,\"ax\"\n" \
	198	"4: movl %3,%0\n" \
	199	" jmp 3b\n" \
	200	".previous\n" \
	201	_ASM_EXTABLE(1b, 4b) \
	202	_ASM_EXTABLE(2b, 4b) \
	203	: "=r" (err) \
	204	: "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))
e30a44fd GC	205
	206	#define __put_user_x8(x, ptr, __ret_pu) \
	207	asm volatile("call __put_user_8" : "=a" (__ret_pu) \
	208	: "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
dc70ddf4 GC	209	#else
	210	#define __put_user_u64(x, ptr, retval) \
	211	__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT)
e30a44fd	212	#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
dc70ddf4 GC	213	#endif
dc70ddf4 GC	214
e30a44fd GC	215	extern void __put_user_bad(void);
	216
	217	/*
	218	* Strange magic calling convention: pointer in %ecx,
	219	* value in %eax(:%edx), return value in %eax. clobbers %rbx
	220	*/
	221	extern void __put_user_1(void);
	222	extern void __put_user_2(void);
	223	extern void __put_user_4(void);
	224	extern void __put_user_8(void);
	225
dc70ddf4 GC	226	#ifdef CONFIG_X86_WP_WORKS_OK
dc70ddf4 GC	227
e30a44fd GC	228	/**
	229	* put_user: - Write a simple value into user space.
	230	* @x: Value to copy to user space.
	231	* @ptr: Destination address, in user space.
	232	*
	233	* Context: User context only. This function may sleep.
	234	*
	235	* This macro copies a single simple value from kernel space to user
	236	* space. It supports simple types like char and int, but not larger
	237	* data types like structures or arrays.
	238	*
	239	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	240	* to the result of dereferencing @ptr.
	241	*
	242	* Returns zero on success, or -EFAULT on error.
	243	*/
	244	#define put_user(x, ptr) \
	245	({ \
	246	int __ret_pu; \
	247	__typeof__(*(ptr)) __pu_val; \
	248	__chk_user_ptr(ptr); \
c10d38dd NP	249	might_sleep(); \
	250	if (current->mm) \
	251	might_lock_read(&current->mm->mmap_sem); \
e30a44fd GC	252	__pu_val = x; \
	253	switch (sizeof(*(ptr))) { \
	254	case 1: \
	255	__put_user_x(1, __pu_val, ptr, __ret_pu); \
	256	break; \
	257	case 2: \
	258	__put_user_x(2, __pu_val, ptr, __ret_pu); \
	259	break; \
	260	case 4: \
	261	__put_user_x(4, __pu_val, ptr, __ret_pu); \
	262	break; \
	263	case 8: \
	264	__put_user_x8(__pu_val, ptr, __ret_pu); \
	265	break; \
	266	default: \
	267	__put_user_x(X, __pu_val, ptr, __ret_pu); \
	268	break; \
	269	} \
	270	__ret_pu; \
	271	})
	272
dc70ddf4 GC	273	#define __put_user_size(x, ptr, size, retval, errret) \
	274	do { \
	275	retval = 0; \
c10d38dd NP	276	might_sleep(); \
	277	if (current->mm) \
	278	might_lock_read(&current->mm->mmap_sem); \
dc70ddf4 GC	279	__chk_user_ptr(ptr); \
	280	switch (size) { \
	281	case 1: \
	282	__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
	283	break; \
	284	case 2: \
	285	__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
	286	break; \
	287	case 4: \
	288	__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);\
	289	break; \
	290	case 8: \
	291	__put_user_u64((__typeof__(*ptr))(x), ptr, retval); \
	292	break; \
	293	default: \
	294	__put_user_bad(); \
	295	} \
	296	} while (0)
	297
	298	#else
	299
	300	#define __put_user_size(x, ptr, size, retval, errret) \
	301	do { \
	302	__typeof__(*(ptr))__pus_tmp = x; \
	303	retval = 0; \
	304	\
	305	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
	306	retval = errret; \
	307	} while (0)
	308
e30a44fd GC	309	#define put_user(x, ptr) \
	310	({ \
	311	int __ret_pu; \
	312	__typeof__(*(ptr))__pus_tmp = x; \
	313	__ret_pu = 0; \
	314	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \
	315	sizeof(*(ptr))) != 0)) \
	316	__ret_pu = -EFAULT; \
	317	__ret_pu; \
	318	})
dc70ddf4 GC	319	#endif
dc70ddf4 GC	320
3f168221 GC	321	#ifdef CONFIG_X86_32
	322	#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad()
	323	#else
	324	#define __get_user_asm_u64(x, ptr, retval, errret) \
	325	__get_user_asm(x, ptr, retval, "q", "", "=r", errret)
	326	#endif
	327
	328	#define __get_user_size(x, ptr, size, retval, errret) \
	329	do { \
	330	retval = 0; \
c10d38dd NP	331	might_sleep(); \
	332	if (current->mm) \
	333	might_lock_read(&current->mm->mmap_sem); \
3f168221 GC	334	__chk_user_ptr(ptr); \
	335	switch (size) { \
	336	case 1: \
	337	__get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
	338	break; \
	339	case 2: \
	340	__get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
	341	break; \
	342	case 4: \
	343	__get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \
	344	break; \
	345	case 8: \
	346	__get_user_asm_u64(x, ptr, retval, errret); \
	347	break; \
	348	default: \
	349	(x) = __get_user_bad(); \
	350	} \
	351	} while (0)
	352
	353	#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \
	354	asm volatile("1: mov"itype" %2,%"rtype"1\n" \
	355	"2:\n" \
	356	".section .fixup,\"ax\"\n" \
	357	"3: mov %3,%0\n" \
	358	" xor"itype" %"rtype"1,%"rtype"1\n" \
	359	" jmp 2b\n" \
	360	".previous\n" \
	361	_ASM_EXTABLE(1b, 3b) \
	362	: "=r" (err), ltype(x) \
	363	: "m" (__m(addr)), "i" (errret), "0" (err))
	364
dc70ddf4 GC	365	#define __put_user_nocheck(x, ptr, size) \
	366	({ \
	367	long __pu_err; \
	368	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
	369	__pu_err; \
	370	})
	371
3f168221 GC	372	#define __get_user_nocheck(x, ptr, size) \
	373	({ \
	374	long __gu_err; \
	375	unsigned long __gu_val; \
	376	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
	377	(x) = (__force __typeof__(*(ptr)))__gu_val; \
	378	__gu_err; \
	379	})
dc70ddf4 GC	380
	381	/* FIXME: this hack is definitely wrong -AK */
	382	struct __large_struct { unsigned long buf[100]; };
	383	#define __m(x) ((struct __large_struct __user )(x))
	384
	385	/*
	386	* Tell gcc we read from memory instead of writing: this is because
	387	* we do not write to any memory gcc knows about, so there are no
	388	* aliasing issues.
	389	*/
	390	#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
	391	asm volatile("1: mov"itype" %"rtype"1,%2\n" \
	392	"2:\n" \
	393	".section .fixup,\"ax\"\n" \
	394	"3: mov %3,%0\n" \
	395	" jmp 2b\n" \
	396	".previous\n" \
	397	_ASM_EXTABLE(1b, 3b) \
	398	: "=r"(err) \
	399	: ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
8cb834e9 GC	400	/**
	401	* __get_user: - Get a simple variable from user space, with less checking.
	402	* @x: Variable to store result.
	403	* @ptr: Source address, in user space.
	404	*
	405	* Context: User context only. This function may sleep.
	406	*
	407	* This macro copies a single simple variable from user space to kernel
	408	* space. It supports simple types like char and int, but not larger
	409	* data types like structures or arrays.
	410	*
	411	* @ptr must have pointer-to-simple-variable type, and the result of
	412	* dereferencing @ptr must be assignable to @x without a cast.
	413	*
	414	* Caller must check the pointer with access_ok() before calling this
	415	* function.
	416	*
	417	* Returns zero on success, or -EFAULT on error.
	418	* On error, the variable @x is set to zero.
	419	*/
	420
	421	#define __get_user(x, ptr) \
	422	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	423	/**
	424	* __put_user: - Write a simple value into user space, with less checking.
	425	* @x: Value to copy to user space.
	426	* @ptr: Destination address, in user space.
	427	*
	428	* Context: User context only. This function may sleep.
	429	*
	430	* This macro copies a single simple value from kernel space to user
	431	* space. It supports simple types like char and int, but not larger
	432	* data types like structures or arrays.
	433	*
	434	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	435	* to the result of dereferencing @ptr.
	436	*
	437	* Caller must check the pointer with access_ok() before calling this
	438	* function.
	439	*
	440	* Returns zero on success, or -EFAULT on error.
	441	*/
	442
	443	#define __put_user(x, ptr) \
	444	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
dc70ddf4	445
8cb834e9 GC	446	#define __get_user_unaligned __get_user
8cb834e9 GC	447	#define __put_user_unaligned __put_user
865e5b76	448
8bc7de0c GC	449	/*
	450	* movsl can be slow when source and dest are not both 8-byte aligned
	451	*/
	452	#ifdef CONFIG_X86_INTEL_USERCOPY
	453	extern struct movsl_mask {
	454	int mask;
	455	} ____cacheline_aligned_in_smp movsl_mask;
	456	#endif
	457
22cac167 GC	458	#define ARCH_HAS_NOCACHE_UACCESS 1
22cac167 GC	459
96a388de TG	460	#ifdef CONFIG_X86_32
	461	# include "uaccess_32.h"
	462	#else
22cac167	463	# define ARCH_HAS_SEARCH_EXTABLE
96a388de TG	464	# include "uaccess_64.h"
96a388de TG	465	#endif
ca233862 GC	466
ca233862 GC	467	#endif
8174c430	468