[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(TASK_SIZE_MAX)

#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_asm_u64(x, addr, err, errret)			\
	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" (errret), "0" (err))

#define __put_user_asm_ex_u64(x, addr)					\
	asm volatile("1:	movl %%eax,0(%1)\n"			\
		     "2:	movl %%edx,4(%1)\n"			\
		     "3:\n"						\
		     _ASM_EXTABLE(1b, 2b - 1b)				\
		     _ASM_EXTABLE(2b, 3b - 2b)				\
		     : : "A" (x), "r" (addr))

#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_asm_u64(x, ptr, retval, errret) \
	__put_user_asm(x, ptr, retval, "q", "", "er", errret)
#define __put_user_asm_ex_u64(x, addr)	\
	__put_user_asm_ex(x, addr, "q", "", "er")
#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_asm_u64((__typeof__(*ptr))(x), ptr, retval,	\
				   errret);				\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

#define __put_user_size_ex(x, ptr, size)				\
do {									\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__put_user_asm_ex(x, ptr, "b", "b", "iq");		\
		break;							\
	case 2:								\
		__put_user_asm_ex(x, ptr, "w", "w", "ir");		\
		break;							\
	case 4:								\
		__put_user_asm_ex(x, ptr, "l", "k", "ir");		\
		break;							\
	case 8:								\
		__put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr);	\
		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()
#define __get_user_asm_ex_u64(x, ptr)			(x) = __get_user_bad()
#else
#define __get_user_asm_u64(x, ptr, retval, errret) \
	 __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
#define __get_user_asm_ex_u64(x, ptr) \
	 __get_user_asm_ex(x, ptr, "q", "", "=r")
#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 __get_user_size_ex(x, ptr, size)				\
do {									\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__get_user_asm_ex(x, ptr, "b", "b", "=q");		\
		break;							\
	case 2:								\
		__get_user_asm_ex(x, ptr, "w", "w", "=r");		\
		break;							\
	case 4:								\
		__get_user_asm_ex(x, ptr, "l", "k", "=r");		\
		break;							\
	case 8:								\
		__get_user_asm_ex_u64(x, ptr);				\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __get_user_asm_ex(x, addr, itype, rtype, ltype)			\
	asm volatile("1:	mov"itype" %1,%"rtype"0\n"		\
		     "2:\n"						\
		     _ASM_EXTABLE(1b, 2b - 1b)				\
		     : ltype(x) : "m" (__m(addr)))

#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))

#define __put_user_asm_ex(x, addr, itype, rtype, ltype)			\
	asm volatile("1:	mov"itype" %"rtype"0,%1\n"		\
		     "2:\n"						\
		     _ASM_EXTABLE(1b, 2b - 1b)				\
		     : : ltype(x), "m" (__m(addr)))

/*
 * uaccess_try and catch
 */
#define uaccess_try	do {						\
	int prev_err = current_thread_info()->uaccess_err;		\
	current_thread_info()->uaccess_err = 0;				\
	barrier();

#define uaccess_catch(err)						\
	(err) |= current_thread_info()->uaccess_err;			\
	current_thread_info()->uaccess_err = prev_err;			\
} while (0)

/**
 * __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

/*
 * {get|put}_user_try and catch
 *
 * get_user_try {
 *	get_user_ex(...);
 * } get_user_catch(err)
 */
#define get_user_try		uaccess_try
#define get_user_catch(err)	uaccess_catch(err)

#define get_user_ex(x, ptr)	do {					\
	unsigned long __gue_val;					\
	__get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr))));	\
	(x) = (__force __typeof__(*(ptr)))__gue_val;			\
} while (0)

#ifdef CONFIG_X86_WP_WORKS_OK

#define put_user_try		uaccess_try
#define put_user_catch(err)	uaccess_catch(err)

#define put_user_ex(x, ptr)						\
	__put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

#else /* !CONFIG_X86_WP_WORKS_OK */

#define put_user_try		do {		\
	int __uaccess_err = 0;

#define put_user_catch(err)			\
	(err) |= __uaccess_err;			\
} while (0)

#define put_user_ex(x, ptr)	do {		\
	__uaccess_err |= __put_user(x, ptr);	\
} while (0)

#endif /* CONFIG_X86_WP_WORKS_OK */

/*
 * 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
# 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)
9063c61f	28	#define USER_DS MAKE_MM_SEG(TASK_SIZE_MAX)
ca233862 GC	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 \
4d5d7838	124	: "=a" (ret), "=d" (x) \
ca233862 GC	125	: "0" (ptr)) \
ca233862 GC	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) \
e30a44fd GC	183	asm volatile("call __put_user_" #size : "=a" (__ret_pu) \
4d5d7838	184	: "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
e30a44fd GC	185
	186
	187
dc70ddf4	188	#ifdef CONFIG_X86_32
18114f61	189	#define __put_user_asm_u64(x, addr, err, errret) \
dc70ddf4 GC	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) \
18114f61	200	: "A" (x), "r" (addr), "i" (errret), "0" (err))
e30a44fd	201
fe40c0af HS	202	#define __put_user_asm_ex_u64(x, addr) \
	203	asm volatile("1: movl %%eax,0(%1)\n" \
	204	"2: movl %%edx,4(%1)\n" \
	205	"3:\n" \
	206	_ASM_EXTABLE(1b, 2b - 1b) \
	207	_ASM_EXTABLE(2b, 3b - 2b) \
	208	: : "A" (x), "r" (addr))
	209
e30a44fd GC	210	#define __put_user_x8(x, ptr, __ret_pu) \
	211	asm volatile("call __put_user_8" : "=a" (__ret_pu) \
	212	: "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
dc70ddf4	213	#else
18114f61	214	#define __put_user_asm_u64(x, ptr, retval, errret) \
ebe119cd	215	__put_user_asm(x, ptr, retval, "q", "", "er", errret)
fe40c0af	216	#define __put_user_asm_ex_u64(x, addr) \
ebe119cd	217	__put_user_asm_ex(x, addr, "q", "", "er")
e30a44fd	218	#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
dc70ddf4 GC	219	#endif
dc70ddf4 GC	220
e30a44fd GC	221	extern void __put_user_bad(void);
	222
	223	/*
	224	* Strange magic calling convention: pointer in %ecx,
	225	* value in %eax(:%edx), return value in %eax. clobbers %rbx
	226	*/
	227	extern void __put_user_1(void);
	228	extern void __put_user_2(void);
	229	extern void __put_user_4(void);
	230	extern void __put_user_8(void);
	231
dc70ddf4 GC	232	#ifdef CONFIG_X86_WP_WORKS_OK
dc70ddf4 GC	233
e30a44fd GC	234	/**
	235	* put_user: - Write a simple value into user space.
	236	* @x: Value to copy to user space.
	237	* @ptr: Destination address, in user space.
	238	*
	239	* Context: User context only. This function may sleep.
	240	*
	241	* This macro copies a single simple value from kernel space to user
	242	* space. It supports simple types like char and int, but not larger
	243	* data types like structures or arrays.
	244	*
	245	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	246	* to the result of dereferencing @ptr.
	247	*
	248	* Returns zero on success, or -EFAULT on error.
	249	*/
	250	#define put_user(x, ptr) \
	251	({ \
	252	int __ret_pu; \
	253	__typeof__(*(ptr)) __pu_val; \
	254	__chk_user_ptr(ptr); \
3ee1afa3	255	might_fault(); \
e30a44fd GC	256	__pu_val = x; \
	257	switch (sizeof(*(ptr))) { \
	258	case 1: \
	259	__put_user_x(1, __pu_val, ptr, __ret_pu); \
	260	break; \
	261	case 2: \
	262	__put_user_x(2, __pu_val, ptr, __ret_pu); \
	263	break; \
	264	case 4: \
	265	__put_user_x(4, __pu_val, ptr, __ret_pu); \
	266	break; \
	267	case 8: \
	268	__put_user_x8(__pu_val, ptr, __ret_pu); \
	269	break; \
	270	default: \
	271	__put_user_x(X, __pu_val, ptr, __ret_pu); \
	272	break; \
	273	} \
	274	__ret_pu; \
	275	})
	276
dc70ddf4 GC	277	#define __put_user_size(x, ptr, size, retval, errret) \
	278	do { \
	279	retval = 0; \
	280	__chk_user_ptr(ptr); \
	281	switch (size) { \
	282	case 1: \
	283	__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
	284	break; \
	285	case 2: \
	286	__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
	287	break; \
	288	case 4: \
4d5d7838	289	__put_user_asm(x, ptr, retval, "l", "k", "ir", errret); \
dc70ddf4 GC	290	break; \
dc70ddf4 GC	291	case 8: \
18114f61 HS	292	__put_user_asm_u64((__typeof__(*ptr))(x), ptr, retval, \
18114f61 HS	293	errret); \
dc70ddf4 GC	294	break; \
	295	default: \
	296	__put_user_bad(); \
	297	} \
	298	} while (0)
	299
fe40c0af HS	300	#define __put_user_size_ex(x, ptr, size) \
	301	do { \
	302	__chk_user_ptr(ptr); \
	303	switch (size) { \
	304	case 1: \
	305	__put_user_asm_ex(x, ptr, "b", "b", "iq"); \
	306	break; \
	307	case 2: \
	308	__put_user_asm_ex(x, ptr, "w", "w", "ir"); \
	309	break; \
	310	case 4: \
	311	__put_user_asm_ex(x, ptr, "l", "k", "ir"); \
	312	break; \
	313	case 8: \
	314	__put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr); \
	315	break; \
	316	default: \
	317	__put_user_bad(); \
	318	} \
	319	} while (0)
	320
dc70ddf4 GC	321	#else
	322
	323	#define __put_user_size(x, ptr, size, retval, errret) \
	324	do { \
	325	__typeof__(*(ptr))__pus_tmp = x; \
	326	retval = 0; \
	327	\
	328	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
	329	retval = errret; \
	330	} while (0)
	331
e30a44fd GC	332	#define put_user(x, ptr) \
	333	({ \
	334	int __ret_pu; \
	335	__typeof__(*(ptr))__pus_tmp = x; \
	336	__ret_pu = 0; \
	337	if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \
	338	sizeof(*(ptr))) != 0)) \
	339	__ret_pu = -EFAULT; \
	340	__ret_pu; \
	341	})
dc70ddf4 GC	342	#endif
dc70ddf4 GC	343
3f168221 GC	344	#ifdef CONFIG_X86_32
3f168221 GC	345	#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad()
fe40c0af	346	#define __get_user_asm_ex_u64(x, ptr) (x) = __get_user_bad()
3f168221 GC	347	#else
	348	#define __get_user_asm_u64(x, ptr, retval, errret) \
	349	__get_user_asm(x, ptr, retval, "q", "", "=r", errret)
fe40c0af HS	350	#define __get_user_asm_ex_u64(x, ptr) \
fe40c0af HS	351	__get_user_asm_ex(x, ptr, "q", "", "=r")
3f168221 GC	352	#endif
	353
	354	#define __get_user_size(x, ptr, size, retval, errret) \
	355	do { \
	356	retval = 0; \
	357	__chk_user_ptr(ptr); \
	358	switch (size) { \
	359	case 1: \
	360	__get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
	361	break; \
	362	case 2: \
	363	__get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
	364	break; \
	365	case 4: \
	366	__get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \
	367	break; \
	368	case 8: \
	369	__get_user_asm_u64(x, ptr, retval, errret); \
	370	break; \
	371	default: \
	372	(x) = __get_user_bad(); \
	373	} \
	374	} while (0)
	375
	376	#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \
	377	asm volatile("1: mov"itype" %2,%"rtype"1\n" \
	378	"2:\n" \
	379	".section .fixup,\"ax\"\n" \
	380	"3: mov %3,%0\n" \
	381	" xor"itype" %"rtype"1,%"rtype"1\n" \
	382	" jmp 2b\n" \
	383	".previous\n" \
	384	_ASM_EXTABLE(1b, 3b) \
	385	: "=r" (err), ltype(x) \
	386	: "m" (__m(addr)), "i" (errret), "0" (err))
	387
fe40c0af HS	388	#define __get_user_size_ex(x, ptr, size) \
	389	do { \
	390	__chk_user_ptr(ptr); \
	391	switch (size) { \
	392	case 1: \
	393	__get_user_asm_ex(x, ptr, "b", "b", "=q"); \
	394	break; \
	395	case 2: \
	396	__get_user_asm_ex(x, ptr, "w", "w", "=r"); \
	397	break; \
	398	case 4: \
	399	__get_user_asm_ex(x, ptr, "l", "k", "=r"); \
	400	break; \
	401	case 8: \
	402	__get_user_asm_ex_u64(x, ptr); \
	403	break; \
	404	default: \
	405	(x) = __get_user_bad(); \
	406	} \
	407	} while (0)
	408
	409	#define __get_user_asm_ex(x, addr, itype, rtype, ltype) \
	410	asm volatile("1: mov"itype" %1,%"rtype"0\n" \
	411	"2:\n" \
	412	_ASM_EXTABLE(1b, 2b - 1b) \
	413	: ltype(x) : "m" (__m(addr)))
	414
dc70ddf4 GC	415	#define __put_user_nocheck(x, ptr, size) \
dc70ddf4 GC	416	({ \
16855f87	417	int __pu_err; \
dc70ddf4 GC	418	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
	419	__pu_err; \
	420	})
	421
3f168221 GC	422	#define __get_user_nocheck(x, ptr, size) \
3f168221 GC	423	({ \
16855f87	424	int __gu_err; \
3f168221 GC	425	unsigned long __gu_val; \
	426	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
	427	(x) = (__force __typeof__(*(ptr)))__gu_val; \
	428	__gu_err; \
	429	})
dc70ddf4 GC	430
	431	/* FIXME: this hack is definitely wrong -AK */
	432	struct __large_struct { unsigned long buf[100]; };
	433	#define __m(x) ((struct __large_struct __user )(x))
	434
	435	/*
	436	* Tell gcc we read from memory instead of writing: this is because
	437	* we do not write to any memory gcc knows about, so there are no
	438	* aliasing issues.
	439	*/
	440	#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
	441	asm volatile("1: mov"itype" %"rtype"1,%2\n" \
	442	"2:\n" \
	443	".section .fixup,\"ax\"\n" \
	444	"3: mov %3,%0\n" \
	445	" jmp 2b\n" \
	446	".previous\n" \
	447	_ASM_EXTABLE(1b, 3b) \
	448	: "=r"(err) \
	449	: ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
fe40c0af HS	450
	451	#define __put_user_asm_ex(x, addr, itype, rtype, ltype) \
	452	asm volatile("1: mov"itype" %"rtype"0,%1\n" \
	453	"2:\n" \
	454	_ASM_EXTABLE(1b, 2b - 1b) \
	455	: : ltype(x), "m" (__m(addr)))
	456
	457	/*
	458	* uaccess_try and catch
	459	*/
	460	#define uaccess_try do { \
	461	int prev_err = current_thread_info()->uaccess_err; \
	462	current_thread_info()->uaccess_err = 0; \
	463	barrier();
	464
	465	#define uaccess_catch(err) \
	466	(err) \|= current_thread_info()->uaccess_err; \
	467	current_thread_info()->uaccess_err = prev_err; \
	468	} while (0)
	469
8cb834e9 GC	470	/**
	471	* __get_user: - Get a simple variable from user space, with less checking.
	472	* @x: Variable to store result.
	473	* @ptr: Source address, in user space.
	474	*
	475	* Context: User context only. This function may sleep.
	476	*
	477	* This macro copies a single simple variable from user space to kernel
	478	* space. It supports simple types like char and int, but not larger
	479	* data types like structures or arrays.
	480	*
	481	* @ptr must have pointer-to-simple-variable type, and the result of
	482	* dereferencing @ptr must be assignable to @x without a cast.
	483	*
	484	* Caller must check the pointer with access_ok() before calling this
	485	* function.
	486	*
	487	* Returns zero on success, or -EFAULT on error.
	488	* On error, the variable @x is set to zero.
	489	*/
	490
	491	#define __get_user(x, ptr) \
	492	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
fe40c0af	493
8cb834e9 GC	494	/**
	495	* __put_user: - Write a simple value into user space, with less checking.
	496	* @x: Value to copy to user space.
	497	* @ptr: Destination address, in user space.
	498	*
	499	* Context: User context only. This function may sleep.
	500	*
	501	* This macro copies a single simple value from kernel space to user
	502	* space. It supports simple types like char and int, but not larger
	503	* data types like structures or arrays.
	504	*
	505	* @ptr must have pointer-to-simple-variable type, and @x must be assignable
	506	* to the result of dereferencing @ptr.
	507	*
	508	* Caller must check the pointer with access_ok() before calling this
	509	* function.
	510	*
	511	* Returns zero on success, or -EFAULT on error.
	512	*/
	513
	514	#define __put_user(x, ptr) \
	515	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
dc70ddf4	516
8cb834e9 GC	517	#define __get_user_unaligned __get_user
8cb834e9 GC	518	#define __put_user_unaligned __put_user
865e5b76	519
fe40c0af HS	520	/*
	521	* {get\|put}_user_try and catch
	522	*
	523	* get_user_try {
	524	* get_user_ex(...);
	525	* } get_user_catch(err)
	526	*/
	527	#define get_user_try uaccess_try
	528	#define get_user_catch(err) uaccess_catch(err)
fe40c0af HS	529
	530	#define get_user_ex(x, ptr) do { \
	531	unsigned long __gue_val; \
	532	__get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr)))); \
	533	(x) = (__force __typeof__(*(ptr)))__gue_val; \
	534	} while (0)
	535
019a1369 HS	536	#ifdef CONFIG_X86_WP_WORKS_OK
	537
	538	#define put_user_try uaccess_try
	539	#define put_user_catch(err) uaccess_catch(err)
	540
fe40c0af HS	541	#define put_user_ex(x, ptr) \
	542	__put_user_size_ex((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	543
019a1369 HS	544	#else /* !CONFIG_X86_WP_WORKS_OK */
	545
	546	#define put_user_try do { \
	547	int __uaccess_err = 0;
	548
	549	#define put_user_catch(err) \
	550	(err) \|= __uaccess_err; \
	551	} while (0)
	552
	553	#define put_user_ex(x, ptr) do { \
	554	__uaccess_err \|= __put_user(x, ptr); \
	555	} while (0)
	556
	557	#endif /* CONFIG_X86_WP_WORKS_OK */
	558
8bc7de0c GC	559	/*
	560	* movsl can be slow when source and dest are not both 8-byte aligned
	561	*/
	562	#ifdef CONFIG_X86_INTEL_USERCOPY
	563	extern struct movsl_mask {
	564	int mask;
	565	} ____cacheline_aligned_in_smp movsl_mask;
	566	#endif
	567
22cac167 GC	568	#define ARCH_HAS_NOCACHE_UACCESS 1
22cac167 GC	569
96a388de TG	570	#ifdef CONFIG_X86_32
	571	# include "uaccess_32.h"
	572	#else
	573	# include "uaccess_64.h"
	574	#endif
ca233862	575
1965aae3	576	#endif /* _ASM_X86_UACCESS_H */
8174c430	577