[PATCH v2 20/31] arm64: User access library functions

[Catalin Marinas <catalin.marinas@arm.com>]

This patch add support for various user access functions. These
functions use the standard LDR/STR instructions and not the LDRT/STRT
variants in order to allow kernel addresses (after set_fs(KERNEL_DS)).

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/uaccess.h   |  377 ++++++++++++++++++++++++++++++++++++
 arch/arm64/lib/clear_user.S        |   58 ++++++
 arch/arm64/lib/copy_from_user.S    |   66 +++++++
 arch/arm64/lib/copy_in_user.S      |   63 ++++++
 arch/arm64/lib/copy_to_user.S      |   61 ++++++
 arch/arm64/lib/getuser.S           |   75 +++++++
 arch/arm64/lib/putuser.S           |   73 +++++++
 arch/arm64/lib/strncpy_from_user.S |   50 +++++
 arch/arm64/lib/strnlen_user.S      |   47 +++++
 9 files changed, 870 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm64/include/asm/uaccess.h
 create mode 100644 arch/arm64/lib/clear_user.S
 create mode 100644 arch/arm64/lib/copy_from_user.S
 create mode 100644 arch/arm64/lib/copy_in_user.S
 create mode 100644 arch/arm64/lib/copy_to_user.S
 create mode 100644 arch/arm64/lib/getuser.S
 create mode 100644 arch/arm64/lib/putuser.S
 create mode 100644 arch/arm64/lib/strncpy_from_user.S
 create mode 100644 arch/arm64/lib/strnlen_user.S

diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
new file mode 100644
index 0000000..09d7b53
--- /dev/null
+++ b/arch/arm64/include/asm/uaccess.h
@@ -0,0 +1,377 @@
+/*
+ * Based on arch/arm/include/asm/uaccess.h
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_UACCESS_H
+#define __ASM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/string.h>
+#include <linux/thread_info.h>
+
+#include <asm/ptrace.h>
+#include <asm/errno.h>
+#include <asm/memory.h>
+#include <asm/compiler.h>
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+/*
+ * 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 two are intentionally not defined anywhere - if the kernel
+ * code generates any references to them, that's a bug.
+ */
+extern long __get_user_bad(void);
+extern long __put_user_bad(void);
+
+#define KERNEL_DS	(-1UL)
+#define get_ds()	(KERNEL_DS)
+
+#define USER_DS		TASK_SIZE_64
+#define get_fs()	(current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+	current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a,b)	((a) == (b))
+
+/*
+ * Return 1 if addr < current->addr_limit, 0 otherwise.
+ */
+#define __addr_ok(addr)							\
+({									\
+	unsigned long flag;						\
+	asm("cmp %1, %0; cset %0, lo"				\
+		: "=&r" (flag)						\
+		: "r" (addr), "0" (current_thread_info()->addr_limit)	\
+		: "cc");						\
+	flag;								\
+})
+
+/*
+ * Test whether a block of memory is a valid user space address.
+ * Returns 1 if the range is valid, 0 otherwise.
+ *
+ * This is equivalent to the following test:
+ * (u65)addr + (u65)size < (u65)current->addr_limit
+ *
+ * This needs 65-bit arithmetic.
+ */
+#define __range_ok(addr,size)						\
+({									\
+	unsigned long flag, roksum;					\
+	__chk_user_ptr(addr);						\
+	asm("adds %1, %1, %3; ccmp %1, %4, #2, cc; cset %0, cc"	\
+		: "=&r" (flag), "=&r" (roksum)				\
+		: "1" (addr), "Ir" (size),				\
+		  "r" (current_thread_info()->addr_limit)		\
+		: "cc");						\
+	flag;								\
+})
+
+/*
+ * Single-value transfer routines.  They automatically use the right
+ * size if we just have the right pointer type.  Note that the functions
+ * which read from user space (*get_*) need to take care not to leak
+ * kernel data even if the calling code is buggy and fails to check
+ * the return value.  This means zeroing out the destination variable
+ * or buffer on error.  Normally this is done out of line by the
+ * fixup code, but there are a few places where it intrudes on the
+ * main code path.  When we only write to user space, there is no
+ * problem.
+ */
+extern long __get_user_1(void *);
+extern long __get_user_2(void *);
+extern long __get_user_4(void *);
+extern long __get_user_8(void *);
+
+#define __get_user_x(__r2,__p,__e,__s,__i...)				\
+	   asm volatile(						\
+		__asmeq("%0", "x0") __asmeq("%1", "x2")			\
+		"bl	__get_user_" #__s				\
+		: "=&r" (__e), "=r" (__r2)				\
+		: "0" (__p)						\
+		: __i, "cc")
+
+#define get_user(x,p)							\
+	({								\
+		register const typeof(*(p)) __user *__p asm("x0") = (p);\
+		register unsigned long __r2 asm("x2");			\
+		register long __e asm("x0");				\
+		switch (sizeof(*(__p))) {				\
+		case 1:							\
+			__get_user_x(__r2, __p, __e, 1, "x30");		\
+			break;						\
+		case 2:							\
+			__get_user_x(__r2, __p, __e, 2, "x3", "x30");	\
+			break;						\
+		case 4:							\
+			__get_user_x(__r2, __p, __e, 4, "x30");		\
+			break;						\
+		case 8:							\
+			__get_user_x(__r2, __p, __e, 8, "x30");		\
+			break;						\
+		default: __e = __get_user_bad(); break;			\
+		}							\
+		x = (typeof(*(p))) __r2;				\
+		__e;							\
+	})
+
+#define __get_user_unaligned __get_user
+
+extern long __put_user_1(void *, unsigned long);
+extern long __put_user_2(void *, unsigned long);
+extern long __put_user_4(void *, unsigned long);
+extern long __put_user_8(void *, unsigned long);
+
+#define __put_user_x(__r2,__p,__e,__s)					\
+	   asm volatile(						\
+		__asmeq("%0", "x0") __asmeq("%2", "x2")			\
+		"bl	__put_user_" #__s				\
+		: "=&r" (__e)						\
+		: "0" (__p), "r" (__r2)					\
+		: "x8", "x30", "cc")
+
+#define put_user(x,p)							\
+	({								\
+		register const typeof(*(p)) __r2 asm("x2") = (x);	\
+		register const typeof(*(p)) __user *__p asm("x0") = (p);\
+		register long __e asm("x0");				\
+		switch (sizeof(*(__p))) {				\
+		case 1:							\
+			__put_user_x(__r2, __p, __e, 1);		\
+			break;						\
+		case 2:							\
+			__put_user_x(__r2, __p, __e, 2);		\
+			break;						\
+		case 4:							\
+			__put_user_x(__r2, __p, __e, 4);		\
+			break;						\
+		case 8:							\
+			__put_user_x(__r2, __p, __e, 8);		\
+			break;						\
+		default: __e = __put_user_bad(); break;			\
+		}							\
+		__e;							\
+	})
+
+#define __put_user_unaligned __put_user
+
+#define access_ok(type,addr,size)	__range_ok(addr,size)
+
+/*
+ * The "__xxx" versions of the user access functions do not verify the
+ * address space - it must have been done previously with a separate
+ * "access_ok()" call.
+ *
+ * The "xxx_error" versions set the third argument to EFAULT if an
+ * error occurs, and leave it unchanged on success.  Note that these
+ * versions are void (ie, don't return a value as such).
+ */
+#define __get_user(x,ptr)						\
+({									\
+	long __gu_err = 0;						\
+	__get_user_err((x),(ptr),__gu_err);				\
+	__gu_err;							\
+})
+
+#define __get_user_error(x,ptr,err)					\
+({									\
+	__get_user_err((x),(ptr),err);					\
+	(void) 0;							\
+})
+
+#define __get_user_err(x,ptr,err)					\
+do {									\
+	unsigned long __gu_addr = (unsigned long)(ptr);			\
+	unsigned long __gu_val;						\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1:								\
+		__get_user_asm("ldrb", "%w", __gu_val, __gu_addr, err);	\
+		break;							\
+	case 2:								\
+		__get_user_asm("ldrh", "%w", __gu_val, __gu_addr, err);	\
+		break;							\
+	case 4:								\
+		__get_user_asm("ldr", "%w", __gu_val, __gu_addr, err);	\
+		break;							\
+	case 8:								\
+		__get_user_asm("ldr", "%",  __gu_val, __gu_addr, err);	\
+		break;							\
+	default:							\
+		(__gu_val) = __get_user_bad();				\
+	}								\
+	(x) = (__typeof__(*(ptr)))__gu_val;				\
+} while (0)
+
+#define __get_user_asm(instr, reg, x, addr, err)			\
+	asm volatile(							\
+	"1:	" instr "	" reg "1, [%2]\n"			\
+	"2:\n"								\
+	"	.section .fixup, \"ax\"\n"				\
+	"	.align	2\n"						\
+	"3:	mov	%0, %3\n"					\
+	"	mov	%1, #0\n"					\
+	"	b	2b\n"						\
+	"	.previous\n"						\
+	"	.section __ex_table,\"a\"\n"				\
+	"	.align	3\n"						\
+	"	.quad	1b, 3b\n"					\
+	"	.previous"						\
+	: "+r" (err), "=&r" (x)						\
+	: "r" (addr), "i" (-EFAULT)					\
+	: "cc")
+
+#define __put_user(x,ptr)						\
+({									\
+	long __pu_err = 0;						\
+	__put_user_err((x),(ptr),__pu_err);				\
+	__pu_err;							\
+})
+
+#define __put_user_error(x,ptr,err)					\
+({									\
+	__put_user_err((x),(ptr),err);					\
+	(void) 0;							\
+})
+
+#define __put_user_err(x,ptr,err)					\
+do {									\
+	unsigned long __pu_addr = (unsigned long)(ptr);			\
+	__typeof__(*(ptr)) __pu_val = (x);				\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1:								\
+		__put_user_asm("strb", "%w", __pu_val, __pu_addr, err);	\
+		break;							\
+	case 2:								\
+		__put_user_asm("strh", "%w", __pu_val, __pu_addr, err);	\
+		break;							\
+	case 4:								\
+		__put_user_asm("str",  "%w", __pu_val, __pu_addr, err);	\
+		break;							\
+	case 8:								\
+		__put_user_asm("str",  "%",  __pu_val, __pu_addr, err);	\
+		break;							\
+	default:							\
+		__put_user_bad();					\
+	}								\
+} while (0)
+
+#define __put_user_asm(instr, reg, x, __pu_addr, err)			\
+	asm volatile(							\
+	"1:	" instr "	" reg "1, [%2]\n"			\
+	"2:\n"								\
+	"	.section .fixup,\"ax\"\n"				\
+	"	.align	2\n"						\
+	"3:	mov	%0, %3\n"					\
+	"	b	2b\n"						\
+	"	.previous\n"						\
+	"	.section __ex_table,\"a\"\n"				\
+	"	.align	3\n"						\
+	"	.quad	1b, 3b\n"					\
+	"	.previous"						\
+	: "+r" (err)							\
+	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)			\
+	: "cc")
+
+extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern unsigned long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
+
+extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count);
+extern unsigned long __must_check __strnlen_user(const char __user *s, long n);
+
+static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	if (access_ok(VERIFY_READ, from, n))
+		n = __copy_from_user(to, from, n);
+	else /* security hole - plug it */
+		memset(to, 0, n);
+	return n;
+}
+
+static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __copy_to_user(to, from, n);
+	return n;
+}
+
+static inline unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n)
+{
+	if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n))
+		n = __copy_in_user(to, from, n);
+	return n;
+}
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __clear_user(to, n);
+	return n;
+}
+
+static inline long __must_check strncpy_from_user(char *dst, const char __user *src, long count)
+{
+	long res = -EFAULT;
+	if (access_ok(VERIFY_READ, src, 1))
+		res = __strncpy_from_user(dst, src, count);
+	return res;
+}
+
+#define strlen_user(s)	strnlen_user(s, ~0UL >> 1)
+
+static inline long __must_check strnlen_user(const char __user *s, long n)
+{
+	unsigned long res = 0;
+
+	if (__addr_ok(s))
+		res = __strnlen_user(s, n);
+
+	return res;
+}
+
+#endif /* __ASM_UACCESS_H */
diff --git a/arch/arm64/lib/clear_user.S b/arch/arm64/lib/clear_user.S
new file mode 100644
index 0000000..6e0ed93
--- /dev/null
+++ b/arch/arm64/lib/clear_user.S
@@ -0,0 +1,58 @@
+/*
+ * Based on arch/arm/lib/clear_user.S
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+	.text
+
+/* Prototype: int __clear_user(void *addr, size_t sz)
+ * Purpose  : clear some user memory
+ * Params   : addr - user memory address to clear
+ *          : sz   - number of bytes to clear
+ * Returns  : number of bytes NOT cleared
+ *
+ * Alignment fixed up by hardware.
+ */
+ENTRY(__clear_user)
+	mov	x2, x1			// save the size for fixup return
+	subs	x1, x1, #8
+	b.mi	2f
+1:
+USER(9f, str	xzr, [x0], #8	)
+	subs	x1, x1, #8
+	b.pl	1b
+2:	adds	x1, x1, #4
+	b.mi	3f
+USER(9f, str	wzr, [x0], #4	)
+	sub	x1, x1, #4
+3:	adds	x1, x1, #2
+	b.mi	4f
+USER(9f, strh	wzr, [x0], #2	)
+	sub	x1, x1, #2
+4:	adds	x1, x1, #1
+	b.mi	5f
+	strb	wzr, [x0]
+5:	mov	x0, #0
+	ret
+ENDPROC(__clear_user)
+
+	.section .fixup,"ax"
+	.align	2
+9:	mov	x0, x2			// return the original size
+	ret
+	.previous
diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S
new file mode 100644
index 0000000..5e27add
--- /dev/null
+++ b/arch/arm64/lib/copy_from_user.S
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy from user space to a kernel buffer (alignment handled by the hardware)
+ *
+ * Parameters:
+ *	x0 - to
+ *	x1 - from
+ *	x2 - n
+ * Returns:
+ *	x0 - bytes not copied
+ */
+ENTRY(__copy_from_user)
+	add	x4, x1, x2			// upper user buffer boundary
+	subs	x2, x2, #8
+	b.mi	2f
+1:
+USER(9f, ldr	x3, [x1], #8	)
+	subs	x2, x2, #8
+	str	x3, [x0], #8
+	b.pl	1b
+2:	adds	x2, x2, #4
+	b.mi	3f
+USER(9f, ldr	w3, [x1], #4	)
+	sub	x2, x2, #4
+	str	w3, [x0], #4
+3:	adds	x2, x2, #2
+	b.mi	4f
+USER(9f, ldrh	w3, [x1], #2	)
+	sub	x2, x2, #2
+	strh	w3, [x0], #2
+4:	adds	x2, x2, #1
+	b.mi	5f
+USER(9f, ldrb	w3, [x1]	)
+	strb	w3, [x0]
+5:	mov	x0, #0
+	ret
+ENDPROC(__copy_from_user)
+
+	.section .fixup,"ax"
+	.align	2
+9:	sub	x2, x4, x1
+	mov	x3, x2
+10:	strb	wzr, [x0], #1			// zero remaining buffer space
+	subs	x3, x3, #1
+	b.ne	10b
+	mov	x0, x2				// bytes not copied
+	ret
+	.previous
diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S
new file mode 100644
index 0000000..84b6c9b
--- /dev/null
+++ b/arch/arm64/lib/copy_in_user.S
@@ -0,0 +1,63 @@
+/*
+ * Copy from user space to user space
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy from user space to user space (alignment handled by the hardware)
+ *
+ * Parameters:
+ *	x0 - to
+ *	x1 - from
+ *	x2 - n
+ * Returns:
+ *	x0 - bytes not copied
+ */
+ENTRY(__copy_in_user)
+	add	x4, x0, x2			// upper user buffer boundary
+	subs	x2, x2, #8
+	b.mi	2f
+1:
+USER(9f, ldr	x3, [x1], #8	)
+	subs	x2, x2, #8
+USER(9f, str	x3, [x0], #8	)
+	b.pl	1b
+2:	adds	x2, x2, #4
+	b.mi	3f
+USER(9f, ldr	w3, [x1], #4	)
+	sub	x2, x2, #4
+USER(9f, str	w3, [x0], #4	)
+3:	adds	x2, x2, #2
+	b.mi	4f
+USER(9f, ldrh	w3, [x1], #2	)
+	sub	x2, x2, #2
+USER(9f, strh	w3, [x0], #2	)
+4:	adds	x2, x2, #1
+	b.mi	5f
+USER(9f, ldrb	w3, [x1]	)
+USER(9f, strb	w3, [x0]	)
+5:	mov	x0, #0
+	ret
+ENDPROC(__copy_in_user)
+
+	.section .fixup,"ax"
+	.align	2
+9:	sub	x0, x4, x0			// bytes not copied
+	ret
+	.previous
diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S
new file mode 100644
index 0000000..a0aeeb9
--- /dev/null
+++ b/arch/arm64/lib/copy_to_user.S
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Copy to user space from a kernel buffer (alignment handled by the hardware)
+ *
+ * Parameters:
+ *	x0 - to
+ *	x1 - from
+ *	x2 - n
+ * Returns:
+ *	x0 - bytes not copied
+ */
+ENTRY(__copy_to_user)
+	add	x4, x0, x2			// upper user buffer boundary
+	subs	x2, x2, #8
+	b.mi	2f
+1:
+	ldr	x3, [x1], #8
+	subs	x2, x2, #8
+USER(9f, str	x3, [x0], #8	)
+	b.pl	1b
+2:	adds	x2, x2, #4
+	b.mi	3f
+	ldr	w3, [x1], #4
+	sub	x2, x2, #4
+USER(9f, str	w3, [x0], #4	)
+3:	adds	x2, x2, #2
+	b.mi	4f
+	ldrh	w3, [x1], #2
+	sub	x2, x2, #2
+USER(9f, strh	w3, [x0], #2	)
+4:	adds	x2, x2, #1
+	b.mi	5f
+	ldrb	w3, [x1]
+USER(9f, strb	w3, [x0]	)
+5:	mov	x0, #0
+	ret
+ENDPROC(__copy_to_user)
+
+	.section .fixup,"ax"
+	.align	2
+9:	sub	x0, x4, x0			// bytes not copied
+	ret
+	.previous
diff --git a/arch/arm64/lib/getuser.S b/arch/arm64/lib/getuser.S
new file mode 100644
index 0000000..1b4da22
--- /dev/null
+++ b/arch/arm64/lib/getuser.S
@@ -0,0 +1,75 @@
+/*
+ * Based on arch/arm/lib/getuser.S
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * These functions have a non-standard call interface to make them more
+ * efficient, especially as they return an error value in addition to
+ * the "real" return value.
+ *
+ * __get_user_X
+ *
+ * Inputs:	x0 contains the address
+ * Outputs:	x0 is the error code
+ *		x2, x3 contains the zero-extended value
+ *		lr corrupted
+ *
+ * No other registers must be altered.  (see <asm/uaccess.h>
+ * for specific ASM register usage).
+ *
+ * Note also that it is intended that __get_user_bad is not global.
+ */
+
+#include <linux/linkage.h>
+#include <asm/errno.h>
+
+ENTRY(__get_user_1)
+1:	ldrb	w2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__get_user_1)
+
+ENTRY(__get_user_2)
+2:	ldrh	w2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__get_user_2)
+
+ENTRY(__get_user_4)
+3:	ldr	w2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__get_user_4)
+
+ENTRY(__get_user_8)
+4:	ldr	x2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__get_user_4)
+
+__get_user_bad:
+	mov	x2, #0
+	mov	x0, #-EFAULT
+	ret
+ENDPROC(__get_user_bad)
+
+.section __ex_table, "a"
+	.quad	1b, __get_user_bad
+	.quad	2b, __get_user_bad
+	.quad	3b, __get_user_bad
+	.quad	4b, __get_user_bad
+.previous
diff --git a/arch/arm64/lib/putuser.S b/arch/arm64/lib/putuser.S
new file mode 100644
index 0000000..62d4a42
--- /dev/null
+++ b/arch/arm64/lib/putuser.S
@@ -0,0 +1,73 @@
+/*
+ * Based on arch/arm/lib/putuser.S
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * These functions have a non-standard call interface to make
+ * them more efficient, especially as they return an error
+ * value in addition to the "real" return value.
+ *
+ * __put_user_X
+ *
+ * Inputs:	x0 contains the address
+ *		x2, x3 contains the value
+ * Outputs:	x0 is the error code
+ *		lr corrupted
+ *
+ * No other registers must be altered.  (see <asm/uaccess.h>
+ * for specific ASM register usage).
+ *
+ * Note that it is intended that __put_user_bad is not global.
+ */
+
+#include <linux/linkage.h>
+#include <asm/errno.h>
+
+ENTRY(__put_user_1)
+1:	strb	w2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__put_user_1)
+
+ENTRY(__put_user_2)
+2:	strh	w2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__put_user_2)
+
+ENTRY(__put_user_4)
+3:	str	w2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__put_user_4)
+
+ENTRY(__put_user_8)
+4:	str	x2, [x0]
+	mov	x0, #0
+	ret
+ENDPROC(__put_user_8)
+
+__put_user_bad:
+	mov	x0, #-EFAULT
+	ret
+ENDPROC(__put_user_bad)
+
+.section __ex_table, "a"
+	.quad	1b, __put_user_bad
+	.quad	2b, __put_user_bad
+	.quad	3b, __put_user_bad
+	.quad	4b, __put_user_bad
+.previous
diff --git a/arch/arm64/lib/strncpy_from_user.S b/arch/arm64/lib/strncpy_from_user.S
new file mode 100644
index 0000000..56e448a
--- /dev/null
+++ b/arch/arm64/lib/strncpy_from_user.S
@@ -0,0 +1,50 @@
+/*
+ * Based on arch/arm/lib/strncpy_from_user.S
+ *
+ * Copyright (C) 1995-2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+	.text
+	.align	5
+
+/*
+ * Copy a string from user space to kernel space.
+ *  x0 = dst, x1 = src, x2 = byte length
+ * returns the number of characters copied (strlen of copied string),
+ *  -EFAULT on exception, or "len" if we fill the whole buffer
+ */
+ENTRY(__strncpy_from_user)
+	mov	x4, x1
+1:	subs	x2, x2, #1
+	bmi	2f
+USER(9f, ldrb	w3, [x1], #1	)
+	strb	w3, [x0], #1
+	cbnz	w3, 1b
+	sub	x1, x1, #1	// take NUL character out of count
+2:	sub	x0, x1, x4
+	ret
+ENDPROC(__strncpy_from_user)
+
+	.section .fixup,"ax"
+	.align	0
+9:	strb	wzr, [x0]	// null terminate
+	mov	x0, #-EFAULT
+	ret
+	.previous
diff --git a/arch/arm64/lib/strnlen_user.S b/arch/arm64/lib/strnlen_user.S
new file mode 100644
index 0000000..7f7b176
--- /dev/null
+++ b/arch/arm64/lib/strnlen_user.S
@@ -0,0 +1,47 @@
+/*
+ * Based on arch/arm/lib/strnlen_user.S
+ *
+ * Copyright (C) 1995-2000 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+	.text
+	.align	5
+
+/* Prototype: unsigned long __strnlen_user(const char *str, long n)
+ * Purpose  : get length of a string in user memory
+ * Params   : str - address of string in user memory
+ * Returns  : length of string *including terminator*
+ *	      or zero on exception, or n if too long
+ */
+ENTRY(__strnlen_user)
+	mov	x2, x0
+1:	subs	x1, x1, #1
+	b.mi	2f
+USER(9f, ldrb	w3, [x0], #1	)
+	cbnz	w3, 1b
+2:	sub	x0, x0, x2
+	ret
+ENDPROC(__strnlen_user)
+
+	.section .fixup,"ax"
+	.align	0
+9:	mov	x0, #0
+	ret
+	.previous