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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2007  Maciej W. Rozycki
 * Copyright (C) 2014, Imagination Technologies Ltd.
 */
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H

#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/asm-eva.h>
#include <asm/extable.h>

/*
 * 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.
 */
#ifdef CONFIG_32BIT

#ifdef CONFIG_KVM_GUEST
#define __UA_LIMIT 0x40000000UL
#else
#define __UA_LIMIT 0x80000000UL
#endif

#define __UA_ADDR	".word"
#define __UA_LA		"la"
#define __UA_ADDU	"addu"
#define __UA_t0		"$8"
#define __UA_t1		"$9"

#endif /* CONFIG_32BIT */

#ifdef CONFIG_64BIT

extern u64 __ua_limit;

#define __UA_LIMIT	__ua_limit

#define __UA_ADDR	".dword"
#define __UA_LA		"dla"
#define __UA_ADDU	"daddu"
#define __UA_t0		"$12"
#define __UA_t1		"$13"

#endif /* CONFIG_64BIT */

/*
 * USER_DS is a bitmask that has the bits set that may not be set in a valid
 * userspace address.  Note that we limit 32-bit userspace to 0x7fff8000 but
 * the arithmetic we're doing only works if the limit is a power of two, so
 * we use 0x80000000 here on 32-bit kernels.  If a process passes an invalid
 * address in this range it's the process's problem, not ours :-)
 */

#ifdef CONFIG_KVM_GUEST
#define KERNEL_DS	((mm_segment_t) { 0x80000000UL })
#define USER_DS		((mm_segment_t) { 0xC0000000UL })
#else
#define KERNEL_DS	((mm_segment_t) { 0UL })
#define USER_DS		((mm_segment_t) { __UA_LIMIT })
#endif

#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)

/*
 * eva_kernel_access() - determine whether kernel memory access on an EVA system
 *
 * Determines whether memory accesses should be performed to kernel memory
 * on a system using Extended Virtual Addressing (EVA).
 *
 * Return: true if a kernel memory access on an EVA system, else false.
 */
static inline bool eva_kernel_access(void)
{
	if (!IS_ENABLED(CONFIG_EVA))
		return false;

	return uaccess_kernel();
}

/*
 * Is a address valid? This does a straightforward calculation rather
 * than tests.
 *
 * Address valid if:
 *  - "addr" doesn't have any high-bits set
 *  - AND "size" doesn't have any high-bits set
 *  - AND "addr+size" doesn't have any high-bits set
 *  - OR we are in kernel mode.
 *
 * __ua_size() is a trick to avoid runtime checking of positive constant
 * sizes; for those we already know at compile time that the size is ok.
 */
#define __ua_size(size)							\
	((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))

/*
 * 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 if pagefaults are
 *          enabled.
 *
 * 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.
 */

static inline int __access_ok(const void __user *p, unsigned long size)
{
	unsigned long addr = (unsigned long)p;
	return (get_fs().seg & (addr | (addr + size) | __ua_size(size))) == 0;
}

#define access_ok(type, addr, size)					\
	likely(__access_ok((addr), (size)))

/*
 * 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 if pagefaults are
 *          enabled.
 *
 * 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) \
	__put_user_check((x), (ptr), sizeof(*(ptr)))

/*
 * 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 if pagefaults are
 *          enabled.
 *
 * 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.
 */
#define get_user(x,ptr) \
	__get_user_check((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 if pagefaults are
 *          enabled.
 *
 * 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((x), (ptr), sizeof(*(ptr)))

/*
 * __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 if pagefaults are
 *          enabled.
 *
 * 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)))

struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))

/*
 * Yuck.  We need two variants, one for 64bit operation and one
 * for 32 bit mode and old iron.
 */
#ifndef CONFIG_EVA
#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
#else
/*
 * Kernel specific functions for EVA. We need to use normal load instructions
 * to read data from kernel when operating in EVA mode. We use these macros to
 * avoid redefining __get_user_asm for EVA.
 */
#undef _loadd
#undef _loadw
#undef _loadh
#undef _loadb
#ifdef CONFIG_32BIT
#define _loadd			_loadw
#else
#define _loadd(reg, addr)	"ld " reg ", " addr
#endif
#define _loadw(reg, addr)	"lw " reg ", " addr
#define _loadh(reg, addr)	"lh " reg ", " addr
#define _loadb(reg, addr)	"lb " reg ", " addr

#define __get_kernel_common(val, size, ptr)				\
do {									\
	switch (size) {							\
	case 1: __get_data_asm(val, _loadb, ptr); break;		\
	case 2: __get_data_asm(val, _loadh, ptr); break;		\
	case 4: __get_data_asm(val, _loadw, ptr); break;		\
	case 8: __GET_DW(val, _loadd, ptr); break;			\
	default: __get_user_unknown(); break;				\
	}								\
} while (0)
#endif

#ifdef CONFIG_32BIT
#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr)
#endif
#ifdef CONFIG_64BIT
#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
#endif

extern void __get_user_unknown(void);

#define __get_user_common(val, size, ptr)				\
do {									\
	switch (size) {							\
	case 1: __get_data_asm(val, user_lb, ptr); break;		\
	case 2: __get_data_asm(val, user_lh, ptr); break;		\
	case 4: __get_data_asm(val, user_lw, ptr); break;		\
	case 8: __GET_DW(val, user_ld, ptr); break;			\
	default: __get_user_unknown(); break;				\
	}								\
} while (0)

#define __get_user_nocheck(x, ptr, size)				\
({									\
	int __gu_err;							\
									\
	if (eva_kernel_access()) {					\
		__get_kernel_common((x), size, ptr);			\
	} else {							\
		__chk_user_ptr(ptr);					\
		__get_user_common((x), size, ptr);			\
	}								\
	__gu_err;							\
})

#define __get_user_check(x, ptr, size)					\
({									\
	int __gu_err = -EFAULT;						\
	const __typeof__(*(ptr)) __user * __gu_ptr = (ptr);		\
									\
	might_fault();							\
	if (likely(access_ok(VERIFY_READ,  __gu_ptr, size))) {		\
		if (eva_kernel_access())				\
			__get_kernel_common((x), size, __gu_ptr);	\
		else							\
			__get_user_common((x), size, __gu_ptr);		\
	} else								\
		(x) = 0;						\
									\
	__gu_err;							\
})

#define __get_data_asm(val, insn, addr)					\
{									\
	long __gu_tmp;							\
									\
	__asm__ __volatile__(						\
	"1:	"insn("%1", "%3")"				\n"	\
	"2:							\n"	\
	"	.insn						\n"	\
	"	.section .fixup,\"ax\"				\n"	\
	"3:	li	%0, %4					\n"	\
	"	move	%1, $0					\n"	\
	"	j	2b					\n"	\
	"	.previous					\n"	\
	"	.section __ex_table,\"a\"			\n"	\
	"	"__UA_ADDR "\t1b, 3b				\n"	\
	"	.previous					\n"	\
	: "=r" (__gu_err), "=r" (__gu_tmp)				\
	: "0" (0), "o" (__m(addr)), "i" (-EFAULT));			\
									\
	(val) = (__typeof__(*(addr))) __gu_tmp;				\
}

/*
 * Get a long long 64 using 32 bit registers.
 */
#define __get_data_asm_ll32(val, insn, addr)				\
{									\
	union {								\
		unsigned long long	l;				\
		__typeof__(*(addr))	t;				\
	} __gu_tmp;							\
									\
	__asm__ __volatile__(						\
	"1:	" insn("%1", "(%3)")"				\n"	\
	"2:	" insn("%D1", "4(%3)")"				\n"	\
	"3:							\n"	\
	"	.insn						\n"	\
	"	.section	.fixup,\"ax\"			\n"	\
	"4:	li	%0, %4					\n"	\
	"	move	%1, $0					\n"	\
	"	move	%D1, $0					\n"	\
	"	j	3b					\n"	\
	"	.previous					\n"	\
	"	.section	__ex_table,\"a\"		\n"	\
	"	" __UA_ADDR "	1b, 4b				\n"	\
	"	" __UA_ADDR "	2b, 4b				\n"	\
	"	.previous					\n"	\
	: "=r" (__gu_err), "=&r" (__gu_tmp.l)				\
	: "0" (0), "r" (addr), "i" (-EFAULT));				\
									\
	(val) = __gu_tmp.t;						\
}

#ifndef CONFIG_EVA
#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
#else
/*
 * Kernel specific functions for EVA. We need to use normal load instructions
 * to read data from kernel when operating in EVA mode. We use these macros to
 * avoid redefining __get_data_asm for EVA.
 */
#undef _stored
#undef _storew
#undef _storeh
#undef _storeb
#ifdef CONFIG_32BIT
#define _stored			_storew
#else
#define _stored(reg, addr)	"ld " reg ", " addr
#endif

#define _storew(reg, addr)	"sw " reg ", " addr
#define _storeh(reg, addr)	"sh " reg ", " addr
#define _storeb(reg, addr)	"sb " reg ", " addr

#define __put_kernel_common(ptr, size)					\
do {									\
	switch (size) {							\
	case 1: __put_data_asm(_storeb, ptr); break;			\
	case 2: __put_data_asm(_storeh, ptr); break;			\
	case 4: __put_data_asm(_storew, ptr); break;			\
	case 8: __PUT_DW(_stored, ptr); break;				\
	default: __put_user_unknown(); break;				\
	}								\
} while(0)
#endif

/*
 * Yuck.  We need two variants, one for 64bit operation and one
 * for 32 bit mode and old iron.
 */
#ifdef CONFIG_32BIT
#define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr)
#endif
#ifdef CONFIG_64BIT
#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
#endif

#define __put_user_common(ptr, size)					\
do {									\
	switch (size) {							\
	case 1: __put_data_asm(user_sb, ptr); break;			\
	case 2: __put_data_asm(user_sh, ptr); break;			\
	case 4: __put_data_asm(user_sw, ptr); break;			\
	case 8: __PUT_DW(user_sd, ptr); break;				\
	default: __put_user_unknown(); break;				\
	}								\
} while (0)

#define __put_user_nocheck(x, ptr, size)				\
({									\
	__typeof__(*(ptr)) __pu_val;					\
	int __pu_err = 0;						\
									\
	__pu_val = (x);							\
	if (eva_kernel_access()) {					\
		__put_kernel_common(ptr, size);				\
	} else {							\
		__chk_user_ptr(ptr);					\
		__put_user_common(ptr, size);				\
	}								\
	__pu_err;							\
})

#define __put_user_check(x, ptr, size)					\
({									\
	__typeof__(*(ptr)) __user *__pu_addr = (ptr);			\
	__typeof__(*(ptr)) __pu_val = (x);				\
	int __pu_err = -EFAULT;						\
									\
	might_fault();							\
	if (likely(access_ok(VERIFY_WRITE,  __pu_addr, size))) {	\
		if (eva_kernel_access())				\
			__put_kernel_common(__pu_addr, size);		\
		else							\
			__put_user_common(__pu_addr, size);		\
	}								\
									\
	__pu_err;							\
})

#define __put_data_asm(insn, ptr)					\
{									\
	__asm__ __volatile__(						\
	"1:	"insn("%z2", "%3")"	# __put_data_asm	\n"	\
	"2:							\n"	\
	"	.insn						\n"	\
	"	.section	.fixup,\"ax\"			\n"	\
	"3:	li	%0, %4					\n"	\
	"	j	2b					\n"	\
	"	.previous					\n"	\
	"	.section	__ex_table,\"a\"		\n"	\
	"	" __UA_ADDR "	1b, 3b				\n"	\
	"	.previous					\n"	\
	: "=r" (__pu_err)						\
	: "0" (0), "Jr" (__pu_val), "o" (__m(ptr)),			\
	  "i" (-EFAULT));						\
}

#define __put_data_asm_ll32(insn, ptr)					\
{									\
	__asm__ __volatile__(						\
	"1:	"insn("%2", "(%3)")"	# __put_data_asm_ll32	\n"	\
	"2:	"insn("%D2", "4(%3)")"				\n"	\
	"3:							\n"	\
	"	.insn						\n"	\
	"	.section	.fixup,\"ax\"			\n"	\
	"4:	li	%0, %4					\n"	\
	"	j	3b					\n"	\
	"	.previous					\n"	\
	"	.section	__ex_table,\"a\"		\n"	\
	"	" __UA_ADDR "	1b, 4b				\n"	\
	"	" __UA_ADDR "	2b, 4b				\n"	\
	"	.previous"						\
	: "=r" (__pu_err)						\
	: "0" (0), "r" (__pu_val), "r" (ptr),				\
	  "i" (-EFAULT));						\
}

extern void __put_user_unknown(void);

/*
 * We're generating jump to subroutines which will be outside the range of
 * jump instructions
 */
#ifdef MODULE
#define __MODULE_JAL(destination)					\
	".set\tnoat\n\t"						\
	__UA_LA "\t$1, " #destination "\n\t"				\
	"jalr\t$1\n\t"							\
	".set\tat\n\t"
#else
#define __MODULE_JAL(destination)					\
	"jal\t" #destination "\n\t"
#endif

#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) &&	\
					      defined(CONFIG_CPU_HAS_PREFETCH))
#define DADDI_SCRATCH "$3"
#else
#define DADDI_SCRATCH "$0"
#endif

extern size_t __copy_user(void *__to, const void *__from, size_t __n);

#define __invoke_copy_from(func, to, from, n)				\
({									\
	register void *__cu_to_r __asm__("$4");				\
	register const void __user *__cu_from_r __asm__("$5");		\
	register long __cu_len_r __asm__("$6");				\
									\
	__cu_to_r = (to);						\
	__cu_from_r = (from);						\
	__cu_len_r = (n);						\
	__asm__ __volatile__(						\
	".set\tnoreorder\n\t"						\
	__MODULE_JAL(func)						\
	".set\tnoat\n\t"						\
	__UA_ADDU "\t$1, %1, %2\n\t"					\
	".set\tat\n\t"							\
	".set\treorder"							\
	: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r)	\
	:								\
	: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31",	\
	  DADDI_SCRATCH, "memory");					\
	__cu_len_r;							\
})

#define __invoke_copy_to(func, to, from, n)				\
({									\
	register void __user *__cu_to_r __asm__("$4");			\
	register const void *__cu_from_r __asm__("$5");			\
	register long __cu_len_r __asm__("$6");				\
									\
	__cu_to_r = (to);						\
	__cu_from_r = (from);						\
	__cu_len_r = (n);						\
	__asm__ __volatile__(						\
	__MODULE_JAL(func)						\
	: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r)	\
	:								\
	: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31",	\
	  DADDI_SCRATCH, "memory");					\
	__cu_len_r;							\
})

#define __invoke_copy_from_kernel(to, from, n)				\
	__invoke_copy_from(__copy_user, to, from, n)

#define __invoke_copy_to_kernel(to, from, n)				\
	__invoke_copy_to(__copy_user, to, from, n)

#define ___invoke_copy_in_kernel(to, from, n)				\
	__invoke_copy_from(__copy_user, to, from, n)

#ifndef CONFIG_EVA
#define __invoke_copy_from_user(to, from, n)				\
	__invoke_copy_from(__copy_user, to, from, n)

#define __invoke_copy_to_user(to, from, n)				\
	__invoke_copy_to(__copy_user, to, from, n)

#define ___invoke_copy_in_user(to, from, n)				\
	__invoke_copy_from(__copy_user, to, from, n)

#else

/* EVA specific functions */

extern size_t __copy_from_user_eva(void *__to, const void *__from,
				   size_t __n);
extern size_t __copy_to_user_eva(void *__to, const void *__from,
				 size_t __n);
extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);

/*
 * Source or destination address is in userland. We need to go through
 * the TLB
 */
#define __invoke_copy_from_user(to, from, n)				\
	__invoke_copy_from(__copy_from_user_eva, to, from, n)

#define __invoke_copy_to_user(to, from, n)				\
	__invoke_copy_to(__copy_to_user_eva, to, from, n)

#define ___invoke_copy_in_user(to, from, n)				\
	__invoke_copy_from(__copy_in_user_eva, to, from, n)

#endif /* CONFIG_EVA */

static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	if (eva_kernel_access())
		return __invoke_copy_to_kernel(to, from, n);
	else
		return __invoke_copy_to_user(to, from, n);
}

static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	if (eva_kernel_access())
		return __invoke_copy_from_kernel(to, from, n);
	else
		return __invoke_copy_from_user(to, from, n);
}

#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

static inline unsigned long
raw_copy_in_user(void __user*to, const void __user *from, unsigned long n)
{
	if (eva_kernel_access())
		return ___invoke_copy_in_kernel(to, from, n);
	else
		return ___invoke_copy_in_user(to, from,	n);
}

extern __kernel_size_t __bzero_kernel(void __user *addr, __kernel_size_t size);
extern __kernel_size_t __bzero(void __user *addr, __kernel_size_t size);

/*
 * __clear_user: - Zero a block of memory in user space, with less checking.
 * @to:	  Destination address, in user space.
 * @n:	  Number of bytes to zero.
 *
 * Zero a block of memory in user space.  Caller must check
 * the specified block with access_ok() before calling this function.
 *
 * Returns number of bytes that could not be cleared.
 * On success, this will be zero.
 */
static inline __kernel_size_t
__clear_user(void __user *addr, __kernel_size_t size)
{
	__kernel_size_t res;

#ifdef CONFIG_CPU_MICROMIPS
/* micromips memset / bzero also clobbers t7 & t8 */
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31"
#else
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"
#endif /* CONFIG_CPU_MICROMIPS */

	if (eva_kernel_access()) {
		__asm__ __volatile__(
			"move\t$4, %1\n\t"
			"move\t$5, $0\n\t"
			"move\t$6, %2\n\t"
			__MODULE_JAL(__bzero_kernel)
			"move\t%0, $6"
			: "=r" (res)
			: "r" (addr), "r" (size)
			: bzero_clobbers);
	} else {
		might_fault();
		__asm__ __volatile__(
			"move\t$4, %1\n\t"
			"move\t$5, $0\n\t"
			"move\t$6, %2\n\t"
			__MODULE_JAL(__bzero)
			"move\t%0, $6"
			: "=r" (res)
			: "r" (addr), "r" (size)
			: bzero_clobbers);
	}

	return res;
}

#define clear_user(addr,n)						\
({									\
	void __user * __cl_addr = (addr);				\
	unsigned long __cl_size = (n);					\
	if (__cl_size && access_ok(VERIFY_WRITE,			\
					__cl_addr, __cl_size))		\
		__cl_size = __clear_user(__cl_addr, __cl_size);		\
	__cl_size;							\
})

extern long __strncpy_from_kernel_asm(char *__to, const char __user *__from, long __len);
extern long __strncpy_from_user_asm(char *__to, const char __user *__from, long __len);

/*
 * strncpy_from_user: - Copy a NUL terminated string from userspace.
 * @dst:   Destination address, in kernel space.  This buffer must be at
 *	   least @count bytes long.
 * @src:   Source address, in user space.
 * @count: Maximum number of bytes to copy, including the trailing NUL.
 *
 * Copies a NUL-terminated string from userspace to kernel space.
 *
 * On success, returns the length of the string (not including the trailing
 * NUL).
 *
 * If access to userspace fails, returns -EFAULT (some data may have been
 * copied).
 *
 * If @count is smaller than the length of the string, copies @count bytes
 * and returns @count.
 */
static inline long
strncpy_from_user(char *__to, const char __user *__from, long __len)
{
	long res;

	if (eva_kernel_access()) {
		__asm__ __volatile__(
			"move\t$4, %1\n\t"
			"move\t$5, %2\n\t"
			"move\t$6, %3\n\t"
			__MODULE_JAL(__strncpy_from_kernel_asm)
			"move\t%0, $2"
			: "=r" (res)
			: "r" (__to), "r" (__from), "r" (__len)
			: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
	} else {
		might_fault();
		__asm__ __volatile__(
			"move\t$4, %1\n\t"
			"move\t$5, %2\n\t"
			"move\t$6, %3\n\t"
			__MODULE_JAL(__strncpy_from_user_asm)
			"move\t%0, $2"
			: "=r" (res)
			: "r" (__to), "r" (__from), "r" (__len)
			: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
	}

	return res;
}

extern long __strnlen_kernel_asm(const char __user *s, long n);
extern long __strnlen_user_asm(const char __user *s, long n);

/*
 * strnlen_user: - Get the size of a string in user space.
 * @str: The string to measure.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * Get the size of a NUL-terminated string in user space.
 *
 * Returns the size of the string INCLUDING the terminating NUL.
 * On exception, returns 0.
 * If the string is too long, returns a value greater than @n.
 */
static inline long strnlen_user(const char __user *s, long n)
{
	long res;

	might_fault();
	if (eva_kernel_access()) {
		__asm__ __volatile__(
			"move\t$4, %1\n\t"
			"move\t$5, %2\n\t"
			__MODULE_JAL(__strnlen_kernel_asm)
			"move\t%0, $2"
			: "=r" (res)
			: "r" (s), "r" (n)
			: "$2", "$4", "$5", __UA_t0, "$31");
	} else {
		__asm__ __volatile__(
			"move\t$4, %1\n\t"
			"move\t$5, %2\n\t"
			__MODULE_JAL(__strnlen_user_asm)
			"move\t%0, $2"
			: "=r" (res)
			: "r" (s), "r" (n)
			: "$2", "$4", "$5", __UA_t0, "$31");
	}

	return res;
}

#endif /* _ASM_UACCESS_H */

Filemanager

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fw Folder 0755
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sn Folder 0755
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vr41xx Folder 0755
xtalk Folder 0755
Kbuild File 577 B 0644
abi.h File 853 B 0644
addrspace.h File 4.1 KB 0644
amon.h File 409 B 0644
arch_hweight.h File 792 B 0644
asm-eva.h File 6.82 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 197 B 0644
asm.h File 8.47 KB 0644
asmmacro-32.h File 2.47 KB 0644
asmmacro-64.h File 1.22 KB 0644
asmmacro.h File 14.07 KB 0644
atomic.h File 19.73 KB 0644
barrier.h File 8.03 KB 0644
bcache.h File 2.04 KB 0644
bitops.h File 15.46 KB 0644
bitrev.h File 608 B 0644
bmips-spaces.h File 268 B 0644
bmips.h File 3.45 KB 0644
bootinfo.h File 5.08 KB 0644
branch.h File 2.35 KB 0644
break.h File 787 B 0644
bug.h File 759 B 0644
bugs.h File 944 B 0644
cache.h File 546 B 0644
cacheflush.h File 4.99 KB 0644
cacheops.h File 3.71 KB 0644
cdmm.h File 3.67 KB 0644
cevt-r4k.h File 823 B 0644
checksum.h File 6.43 KB 0644
clock.h File 997 B 0644
clocksource.h File 884 B 0644
cmp.h File 492 B 0644
cmpxchg.h File 5.28 KB 0644
compat-signal.h File 640 B 0644
compat.h File 6.66 KB 0644
compiler.h File 2.96 KB 0644
cop2.h File 1.77 KB 0644
cpu-features.h File 19.46 KB 0644
cpu-info.h File 5.84 KB 0644
cpu-type.h File 4.13 KB 0644
cpu.h File 15.54 KB 0644
cpufeature.h File 717 B 0644
debug.h File 654 B 0644
delay.h File 841 B 0644
device.h File 347 B 0644
div64.h File 2.17 KB 0644
dma-coherence.h File 813 B 0644
dma-mapping.h File 981 B 0644
dma.h File 9.92 KB 0644
ds1287.h File 1019 B 0644
dsemul.h File 3.24 KB 0644
dsp.h File 1.91 KB 0644
edac.h File 819 B 0644
elf.h File 15.04 KB 0644
errno.h File 429 B 0644
eva.h File 796 B 0644
exec.h File 579 B 0644
extable.h File 241 B 0644
fb.h File 372 B 0644
fixmap.h File 2.29 KB 0644
floppy.h File 1.57 KB 0644
fpregdef.h File 2.66 KB 0644
fpu.h File 5.21 KB 0644
fpu_emulator.h File 5.74 KB 0644
ftrace.h File 2.11 KB 0644
futex.h File 4.87 KB 0644
gio_device.h File 1.5 KB 0644
gt64120.h File 19.37 KB 0644
hardirq.h File 544 B 0644
hazards.h File 8.36 KB 0644
highmem.h File 1.72 KB 0644
hpet.h File 1.93 KB 0644
hugetlb.h File 2.76 KB 0644
hw_irq.h File 475 B 0644
i8259.h File 2.52 KB 0644
ide.h File 330 B 0644
idle.h File 689 B 0644
inst.h File 2.34 KB 0644
io.h File 18.44 KB 0644
irq.h File 2.26 KB 0644
irq_cpu.h File 708 B 0644
irq_gt641xx.h File 2.69 KB 0644
irq_regs.h File 744 B 0644
irqflags.h File 4.04 KB 0644
isa-rev.h File 556 B 0644
isadep.h File 603 B 0644
jazz.h File 8 KB 0644
jazzdma.h File 2.97 KB 0644
jump_label.h File 1.4 KB 0644
kdebug.h File 303 B 0644
kexec.h File 1.53 KB 0644
kgdb.h File 1.19 KB 0644
kmap_types.h File 221 B 0644
kprobes.h File 2.68 KB 0644
kvm_host.h File 37.88 KB 0644
kvm_para.h File 2.09 KB 0644
linkage.h File 306 B 0644
llsc.h File 623 B 0644
local.h File 4.99 KB 0644
m48t37.h File 732 B 0644
maar.h File 4.04 KB 0644
machine.h File 2.93 KB 0644
mc146818-time.h File 3.69 KB 0644
mc146818rtc.h File 450 B 0644
mips-cm.h File 15.86 KB 0644
mips-cpc.h File 5.83 KB 0644
mips-cps.h File 6.55 KB 0644
mips-gic.h File 12.3 KB 0644
mips-r2-to-r6-emul.h File 2.05 KB 0644
mips_machine.h File 1.32 KB 0644
mips_mt.h File 707 B 0644
mipsmtregs.h File 10.9 KB 0644
mipsprom.h File 2.1 KB 0644
mipsregs.h File 88.1 KB 0644
mmu.h File 550 B 0644
mmu_context.h File 5.41 KB 0644
mmzone.h File 561 B 0644
module.h File 4.45 KB 0644
msa.h File 8.01 KB 0644
msc01_ic.h File 6.55 KB 0644
nile4.h File 10.33 KB 0644
paccess.h File 3.07 KB 0644
page.h File 7.19 KB 0644
pci.h File 4.08 KB 0644
perf_event.h File 482 B 0644
pgalloc.h File 3.21 KB 0644
pgtable-32.h File 7.31 KB 0644
pgtable-64.h File 10.87 KB 0644
pgtable-bits.h File 7.36 KB 0644
pgtable.h File 17.34 KB 0644
pm-cps.h File 1.68 KB 0644
pm.h File 3.99 KB 0644
pmon.h File 1.64 KB 0644
prefetch.h File 2.1 KB 0644
processor.h File 11.71 KB 0644
prom.h File 845 B 0644
ptrace.h File 5.55 KB 0644
r4k-timer.h File 604 B 0644
r4kcache.h File 26.34 KB 0644
reboot.h File 440 B 0644
reg.h File 26 B 0644
regdef.h File 2.63 KB 0644
rtlx.h File 2.1 KB 0644
seccomp.h File 800 B 0644
serial.h File 607 B 0644
setup.h File 884 B 0644
sgialib.h File 2.45 KB 0644
sgiarcs.h File 15.32 KB 0644
shmparam.h File 352 B 0644
sigcontext.h File 1.04 KB 0644
signal.h File 1.02 KB 0644
sim.h File 2.32 KB 0644
smp-cps.h File 1.18 KB 0644
smp-ops.h File 2.33 KB 0644
smp.h File 3.31 KB 0644
sni.h File 7.27 KB 0644
socket.h File 1.34 KB 0644
sparsemem.h File 486 B 0644
spinlock.h File 459 B 0644
spinlock_types.h File 188 B 0644
spram.h File 262 B 0644
stackframe.h File 10.82 KB 0644
stackprotector.h File 1.15 KB 0644
stacktrace.h File 2.15 KB 0644
string.h File 2.94 KB 0644
switch_to.h File 4.19 KB 0644
syscall.h File 3.57 KB 0644
termios.h File 2.89 KB 0644
thread_info.h File 6.63 KB 0644
time.h File 2.13 KB 0644
timex.h File 2.87 KB 0644
tlb.h File 1.09 KB 0644
tlbdebug.h File 403 B 0644
tlbex.h File 788 B 0644
tlbflush.h File 1.67 KB 0644
tlbmisc.h File 320 B 0644
topology.h File 619 B 0644
traps.h File 1.25 KB 0644
txx9irq.h File 743 B 0644
txx9pio.h File 592 B 0644
txx9tmr.h File 1.59 KB 0644
types.h File 487 B 0644
uaccess.h File 22.2 KB 0644
uasm.h File 9.18 KB 0644
unistd.h File 1.9 KB 0644
uprobes.h File 1.11 KB 0644
vdso.h File 3.72 KB 0644
vga.h File 1.26 KB 0644
vpe.h File 2.7 KB 0644
war.h File 7.48 KB 0644
watch.h File 827 B 0644
wbflush.h File 694 B 0644
yamon-dt.h File 1.88 KB 0644