Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 796 insertions, 0 deletions

diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
new file mode 100644
index 000000000..06629011a
--- /dev/null
+++ b/arch/mips/include/asm/uaccess.h
@@ -0,0 +1,796 @@
+/*
+ * 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 */