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

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * vineetg: June 2010
 *    -__clear_user( ) called multiple times during elf load was byte loop
 *    converted to do as much word clear as possible.
 *
 * vineetg: Dec 2009
 *    -Hand crafted constant propagation for "constant" copy sizes
 *    -stock kernel shrunk by 33K at -O3
 *
 * vineetg: Sept 2009
 *    -Added option to (UN)inline copy_(to|from)_user to reduce code sz
 *    -kernel shrunk by 200K even at -O3 (gcc 4.2.1)
 *    -Enabled when doing -Os
 *
 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
 */

#ifndef _ASM_ARC_UACCESS_H
#define _ASM_ARC_UACCESS_H

#include <linux/string.h>	/* for generic string functions */


#define __kernel_ok		(uaccess_kernel())

/*
 * Algorithmically, for __user_ok() we want do:
 * 	(start < TASK_SIZE) && (start+len < TASK_SIZE)
 * where TASK_SIZE could either be retrieved from thread_info->addr_limit or
 * emitted directly in code.
 *
 * This can however be rewritten as follows:
 *	(len <= TASK_SIZE) && (start+len < TASK_SIZE)
 *
 * Because it essentially checks if buffer end is within limit and @len is
 * non-ngeative, which implies that buffer start will be within limit too.
 *
 * The reason for rewriting being, for majority of cases, @len is generally
 * compile time constant, causing first sub-expression to be compile time
 * subsumed.
 *
 * The second part would generate weird large LIMMs e.g. (0x6000_0000 - 0x10),
 * so we check for TASK_SIZE using get_fs() since the addr_limit load from mem
 * would already have been done at this call site for __kernel_ok()
 *
 */
#define __user_ok(addr, sz)	(((sz) <= TASK_SIZE) && \
				 ((addr) <= (get_fs() - (sz))))
#define __access_ok(addr, sz)	(unlikely(__kernel_ok) || \
				 likely(__user_ok((addr), (sz))))

/*********** Single byte/hword/word copies ******************/

#define __get_user_fn(sz, u, k)					\
({								\
	long __ret = 0;	/* success by default */	\
	switch (sz) {						\
	case 1: __arc_get_user_one(*(k), u, "ldb", __ret); break;	\
	case 2: __arc_get_user_one(*(k), u, "ldw", __ret); break;	\
	case 4: __arc_get_user_one(*(k), u, "ld", __ret);  break;	\
	case 8: __arc_get_user_one_64(*(k), u, __ret);     break;	\
	}							\
	__ret;							\
})

/*
 * Returns 0 on success, -EFAULT if not.
 * @ret already contains 0 - given that errors will be less likely
 * (hence +r asm constraint below).
 * In case of error, fixup code will make it -EFAULT
 */
#define __arc_get_user_one(dst, src, op, ret)	\
	__asm__ __volatile__(                   \
	"1:	"op"    %1,[%2]\n"		\
	"2:	;nop\n"				\
	"	.section .fixup, \"ax\"\n"	\
	"	.align 4\n"			\
	"3:	# return -EFAULT\n"		\
	"	mov %0, %3\n"			\
	"	# zero out dst ptr\n"		\
	"	mov %1,  0\n"			\
	"	j   2b\n"			\
	"	.previous\n"			\
	"	.section __ex_table, \"a\"\n"	\
	"	.align 4\n"			\
	"	.word 1b,3b\n"			\
	"	.previous\n"			\
						\
	: "+r" (ret), "=r" (dst)		\
	: "r" (src), "ir" (-EFAULT))

#define __arc_get_user_one_64(dst, src, ret)	\
	__asm__ __volatile__(                   \
	"1:	ld   %1,[%2]\n"			\
	"4:	ld  %R1,[%2, 4]\n"		\
	"2:	;nop\n"				\
	"	.section .fixup, \"ax\"\n"	\
	"	.align 4\n"			\
	"3:	# return -EFAULT\n"		\
	"	mov %0, %3\n"			\
	"	# zero out dst ptr\n"		\
	"	mov %1,  0\n"			\
	"	mov %R1, 0\n"			\
	"	j   2b\n"			\
	"	.previous\n"			\
	"	.section __ex_table, \"a\"\n"	\
	"	.align 4\n"			\
	"	.word 1b,3b\n"			\
	"	.word 4b,3b\n"			\
	"	.previous\n"			\
						\
	: "+r" (ret), "=r" (dst)		\
	: "r" (src), "ir" (-EFAULT))

#define __put_user_fn(sz, u, k)					\
({								\
	long __ret = 0;	/* success by default */	\
	switch (sz) {						\
	case 1: __arc_put_user_one(*(k), u, "stb", __ret); break;	\
	case 2: __arc_put_user_one(*(k), u, "stw", __ret); break;	\
	case 4: __arc_put_user_one(*(k), u, "st", __ret);  break;	\
	case 8: __arc_put_user_one_64(*(k), u, __ret);     break;	\
	}							\
	__ret;							\
})

#define __arc_put_user_one(src, dst, op, ret)	\
	__asm__ __volatile__(                   \
	"1:	"op"    %1,[%2]\n"		\
	"2:	;nop\n"				\
	"	.section .fixup, \"ax\"\n"	\
	"	.align 4\n"			\
	"3:	mov %0, %3\n"			\
	"	j   2b\n"			\
	"	.previous\n"			\
	"	.section __ex_table, \"a\"\n"	\
	"	.align 4\n"			\
	"	.word 1b,3b\n"			\
	"	.previous\n"			\
						\
	: "+r" (ret)				\
	: "r" (src), "r" (dst), "ir" (-EFAULT))

#define __arc_put_user_one_64(src, dst, ret)	\
	__asm__ __volatile__(                   \
	"1:	st   %1,[%2]\n"			\
	"4:	st  %R1,[%2, 4]\n"		\
	"2:	;nop\n"				\
	"	.section .fixup, \"ax\"\n"	\
	"	.align 4\n"			\
	"3:	mov %0, %3\n"			\
	"	j   2b\n"			\
	"	.previous\n"			\
	"	.section __ex_table, \"a\"\n"	\
	"	.align 4\n"			\
	"	.word 1b,3b\n"			\
	"	.word 4b,3b\n"			\
	"	.previous\n"			\
						\
	: "+r" (ret)				\
	: "r" (src), "r" (dst), "ir" (-EFAULT))


static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	long res = 0;
	char val;
	unsigned long tmp1, tmp2, tmp3, tmp4;
	unsigned long orig_n = n;

	if (n == 0)
		return 0;

	/* unaligned */
	if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) {

		unsigned char tmp;

		__asm__ __volatile__ (
		"	mov.f   lp_count, %0		\n"
		"	lpnz 2f				\n"
		"1:	ldb.ab  %1, [%3, 1]		\n"
		"	stb.ab  %1, [%2, 1]		\n"
		"	sub     %0,%0,1			\n"
		"2:	;nop				\n"
		"	.section .fixup, \"ax\"		\n"
		"	.align 4			\n"
		"3:	j   2b				\n"
		"	.previous			\n"
		"	.section __ex_table, \"a\"	\n"
		"	.align 4			\n"
		"	.word   1b, 3b			\n"
		"	.previous			\n"

		: "+r" (n),
		/*
		 * Note as an '&' earlyclobber operand to make sure the
		 * temporary register inside the loop is not the same as
		 *  FROM or TO.
		*/
		  "=&r" (tmp), "+r" (to), "+r" (from)
		:
		: "lp_count", "memory");

		return n;
	}

	/*
	 * Hand-crafted constant propagation to reduce code sz of the
	 * laddered copy 16x,8,4,2,1
	 */
	if (__builtin_constant_p(orig_n)) {
		res = orig_n;

		if (orig_n / 16) {
			orig_n = orig_n % 16;

			__asm__ __volatile__(
			"	lsr   lp_count, %7,4		\n"
			"	lp    3f			\n"
			"1:	ld.ab   %3, [%2, 4]		\n"
			"11:	ld.ab   %4, [%2, 4]		\n"
			"12:	ld.ab   %5, [%2, 4]		\n"
			"13:	ld.ab   %6, [%2, 4]		\n"
			"	st.ab   %3, [%1, 4]		\n"
			"	st.ab   %4, [%1, 4]		\n"
			"	st.ab   %5, [%1, 4]		\n"
			"	st.ab   %6, [%1, 4]		\n"
			"	sub     %0,%0,16		\n"
			"3:	;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   3b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   1b, 4b			\n"
			"	.word   11b,4b			\n"
			"	.word   12b,4b			\n"
			"	.word   13b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from),
			  "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
			: "ir"(n)
			: "lp_count", "memory");
		}
		if (orig_n / 8) {
			orig_n = orig_n % 8;

			__asm__ __volatile__(
			"14:	ld.ab   %3, [%2,4]		\n"
			"15:	ld.ab   %4, [%2,4]		\n"
			"	st.ab   %3, [%1,4]		\n"
			"	st.ab   %4, [%1,4]		\n"
			"	sub     %0,%0,8			\n"
			"31:	;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   31b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   14b,4b			\n"
			"	.word   15b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from),
			  "=r"(tmp1), "=r"(tmp2)
			:
			: "memory");
		}
		if (orig_n / 4) {
			orig_n = orig_n % 4;

			__asm__ __volatile__(
			"16:	ld.ab   %3, [%2,4]		\n"
			"	st.ab   %3, [%1,4]		\n"
			"	sub     %0,%0,4			\n"
			"32:	;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   32b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   16b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
			:
			: "memory");
		}
		if (orig_n / 2) {
			orig_n = orig_n % 2;

			__asm__ __volatile__(
			"17:	ldw.ab   %3, [%2,2]		\n"
			"	stw.ab   %3, [%1,2]		\n"
			"	sub      %0,%0,2		\n"
			"33:	;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   33b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   17b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
			:
			: "memory");
		}
		if (orig_n & 1) {
			__asm__ __volatile__(
			"18:	ldb.ab   %3, [%2,2]		\n"
			"	stb.ab   %3, [%1,2]		\n"
			"	sub      %0,%0,1		\n"
			"34:	; nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   34b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   18b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
			:
			: "memory");
		}
	} else {  /* n is NOT constant, so laddered copy of 16x,8,4,2,1  */

		__asm__ __volatile__(
		"	mov %0,%3			\n"
		"	lsr.f   lp_count, %3,4		\n"  /* 16x bytes */
		"	lpnz    3f			\n"
		"1:	ld.ab   %5, [%2, 4]		\n"
		"11:	ld.ab   %6, [%2, 4]		\n"
		"12:	ld.ab   %7, [%2, 4]		\n"
		"13:	ld.ab   %8, [%2, 4]		\n"
		"	st.ab   %5, [%1, 4]		\n"
		"	st.ab   %6, [%1, 4]		\n"
		"	st.ab   %7, [%1, 4]		\n"
		"	st.ab   %8, [%1, 4]		\n"
		"	sub     %0,%0,16		\n"
		"3:	and.f   %3,%3,0xf		\n"  /* stragglers */
		"	bz      34f			\n"
		"	bbit0   %3,3,31f		\n"  /* 8 bytes left */
		"14:	ld.ab   %5, [%2,4]		\n"
		"15:	ld.ab   %6, [%2,4]		\n"
		"	st.ab   %5, [%1,4]		\n"
		"	st.ab   %6, [%1,4]		\n"
		"	sub.f   %0,%0,8			\n"
		"31:	bbit0   %3,2,32f		\n"  /* 4 bytes left */
		"16:	ld.ab   %5, [%2,4]		\n"
		"	st.ab   %5, [%1,4]		\n"
		"	sub.f   %0,%0,4			\n"
		"32:	bbit0   %3,1,33f		\n"  /* 2 bytes left */
		"17:	ldw.ab  %5, [%2,2]		\n"
		"	stw.ab  %5, [%1,2]		\n"
		"	sub.f   %0,%0,2			\n"
		"33:	bbit0   %3,0,34f		\n"
		"18:	ldb.ab  %5, [%2,1]		\n"  /* 1 byte left */
		"	stb.ab  %5, [%1,1]		\n"
		"	sub.f   %0,%0,1			\n"
		"34:	;nop				\n"
		"	.section .fixup, \"ax\"		\n"
		"	.align 4			\n"
		"4:	j   34b				\n"
		"	.previous			\n"
		"	.section __ex_table, \"a\"	\n"
		"	.align 4			\n"
		"	.word   1b, 4b			\n"
		"	.word   11b,4b			\n"
		"	.word   12b,4b			\n"
		"	.word   13b,4b			\n"
		"	.word   14b,4b			\n"
		"	.word   15b,4b			\n"
		"	.word   16b,4b			\n"
		"	.word   17b,4b			\n"
		"	.word   18b,4b			\n"
		"	.previous			\n"
		: "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val),
		  "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
		:
		: "lp_count", "memory");
	}

	return res;
}

static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	long res = 0;
	char val;
	unsigned long tmp1, tmp2, tmp3, tmp4;
	unsigned long orig_n = n;

	if (n == 0)
		return 0;

	/* unaligned */
	if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) {

		unsigned char tmp;

		__asm__ __volatile__(
		"	mov.f   lp_count, %0		\n"
		"	lpnz 3f				\n"
		"	ldb.ab  %1, [%3, 1]		\n"
		"1:	stb.ab  %1, [%2, 1]		\n"
		"	sub     %0, %0, 1		\n"
		"3:	;nop				\n"
		"	.section .fixup, \"ax\"		\n"
		"	.align 4			\n"
		"4:	j   3b				\n"
		"	.previous			\n"
		"	.section __ex_table, \"a\"	\n"
		"	.align 4			\n"
		"	.word   1b, 4b			\n"
		"	.previous			\n"

		: "+r" (n),
		/* Note as an '&' earlyclobber operand to make sure the
		 * temporary register inside the loop is not the same as
		 * FROM or TO.
		 */
		  "=&r" (tmp), "+r" (to), "+r" (from)
		:
		: "lp_count", "memory");

		return n;
	}

	if (__builtin_constant_p(orig_n)) {
		res = orig_n;

		if (orig_n / 16) {
			orig_n = orig_n % 16;

			__asm__ __volatile__(
			"	lsr lp_count, %7,4		\n"
			"	lp  3f				\n"
			"	ld.ab %3, [%2, 4]		\n"
			"	ld.ab %4, [%2, 4]		\n"
			"	ld.ab %5, [%2, 4]		\n"
			"	ld.ab %6, [%2, 4]		\n"
			"1:	st.ab %3, [%1, 4]		\n"
			"11:	st.ab %4, [%1, 4]		\n"
			"12:	st.ab %5, [%1, 4]		\n"
			"13:	st.ab %6, [%1, 4]		\n"
			"	sub   %0, %0, 16		\n"
			"3:;nop					\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   3b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   1b, 4b			\n"
			"	.word   11b,4b			\n"
			"	.word   12b,4b			\n"
			"	.word   13b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from),
			  "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
			: "ir"(n)
			: "lp_count", "memory");
		}
		if (orig_n / 8) {
			orig_n = orig_n % 8;

			__asm__ __volatile__(
			"	ld.ab   %3, [%2,4]		\n"
			"	ld.ab   %4, [%2,4]		\n"
			"14:	st.ab   %3, [%1,4]		\n"
			"15:	st.ab   %4, [%1,4]		\n"
			"	sub     %0, %0, 8		\n"
			"31:;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   31b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   14b,4b			\n"
			"	.word   15b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from),
			  "=r"(tmp1), "=r"(tmp2)
			:
			: "memory");
		}
		if (orig_n / 4) {
			orig_n = orig_n % 4;

			__asm__ __volatile__(
			"	ld.ab   %3, [%2,4]		\n"
			"16:	st.ab   %3, [%1,4]		\n"
			"	sub     %0, %0, 4		\n"
			"32:;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   32b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   16b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
			:
			: "memory");
		}
		if (orig_n / 2) {
			orig_n = orig_n % 2;

			__asm__ __volatile__(
			"	ldw.ab    %3, [%2,2]		\n"
			"17:	stw.ab    %3, [%1,2]		\n"
			"	sub       %0, %0, 2		\n"
			"33:;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   33b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   17b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
			:
			: "memory");
		}
		if (orig_n & 1) {
			__asm__ __volatile__(
			"	ldb.ab  %3, [%2,1]		\n"
			"18:	stb.ab  %3, [%1,1]		\n"
			"	sub     %0, %0, 1		\n"
			"34:	;nop				\n"
			"	.section .fixup, \"ax\"		\n"
			"	.align 4			\n"
			"4:	j   34b				\n"
			"	.previous			\n"
			"	.section __ex_table, \"a\"	\n"
			"	.align 4			\n"
			"	.word   18b,4b			\n"
			"	.previous			\n"
			: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
			:
			: "memory");
		}
	} else {  /* n is NOT constant, so laddered copy of 16x,8,4,2,1  */

		__asm__ __volatile__(
		"	mov   %0,%3			\n"
		"	lsr.f lp_count, %3,4		\n"  /* 16x bytes */
		"	lpnz  3f			\n"
		"	ld.ab %5, [%2, 4]		\n"
		"	ld.ab %6, [%2, 4]		\n"
		"	ld.ab %7, [%2, 4]		\n"
		"	ld.ab %8, [%2, 4]		\n"
		"1:	st.ab %5, [%1, 4]		\n"
		"11:	st.ab %6, [%1, 4]		\n"
		"12:	st.ab %7, [%1, 4]		\n"
		"13:	st.ab %8, [%1, 4]		\n"
		"	sub   %0, %0, 16		\n"
		"3:	and.f %3,%3,0xf			\n" /* stragglers */
		"	bz 34f				\n"
		"	bbit0   %3,3,31f		\n" /* 8 bytes left */
		"	ld.ab   %5, [%2,4]		\n"
		"	ld.ab   %6, [%2,4]		\n"
		"14:	st.ab   %5, [%1,4]		\n"
		"15:	st.ab   %6, [%1,4]		\n"
		"	sub.f   %0, %0, 8		\n"
		"31:	bbit0   %3,2,32f		\n"  /* 4 bytes left */
		"	ld.ab   %5, [%2,4]		\n"
		"16:	st.ab   %5, [%1,4]		\n"
		"	sub.f   %0, %0, 4		\n"
		"32:	bbit0 %3,1,33f			\n"  /* 2 bytes left */
		"	ldw.ab    %5, [%2,2]		\n"
		"17:	stw.ab    %5, [%1,2]		\n"
		"	sub.f %0, %0, 2			\n"
		"33:	bbit0 %3,0,34f			\n"
		"	ldb.ab    %5, [%2,1]		\n"  /* 1 byte left */
		"18:	stb.ab  %5, [%1,1]		\n"
		"	sub.f %0, %0, 1			\n"
		"34:	;nop				\n"
		"	.section .fixup, \"ax\"		\n"
		"	.align 4			\n"
		"4:	j   34b				\n"
		"	.previous			\n"
		"	.section __ex_table, \"a\"	\n"
		"	.align 4			\n"
		"	.word   1b, 4b			\n"
		"	.word   11b,4b			\n"
		"	.word   12b,4b			\n"
		"	.word   13b,4b			\n"
		"	.word   14b,4b			\n"
		"	.word   15b,4b			\n"
		"	.word   16b,4b			\n"
		"	.word   17b,4b			\n"
		"	.word   18b,4b			\n"
		"	.previous			\n"
		: "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val),
		  "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
		:
		: "lp_count", "memory");
	}

	return res;
}

static inline unsigned long __arc_clear_user(void __user *to, unsigned long n)
{
	long res = n;
	unsigned char *d_char = to;

	__asm__ __volatile__(
	"	bbit0   %0, 0, 1f		\n"
	"75:	stb.ab  %2, [%0,1]		\n"
	"	sub %1, %1, 1			\n"
	"1:	bbit0   %0, 1, 2f		\n"
	"76:	stw.ab  %2, [%0,2]		\n"
	"	sub %1, %1, 2			\n"
	"2:	asr.f   lp_count, %1, 2		\n"
	"	lpnz    3f			\n"
	"77:	st.ab   %2, [%0,4]		\n"
	"	sub %1, %1, 4			\n"
	"3:	bbit0   %1, 1, 4f		\n"
	"78:	stw.ab  %2, [%0,2]		\n"
	"	sub %1, %1, 2			\n"
	"4:	bbit0   %1, 0, 5f		\n"
	"79:	stb.ab  %2, [%0,1]		\n"
	"	sub %1, %1, 1			\n"
	"5:					\n"
	"	.section .fixup, \"ax\"		\n"
	"	.align 4			\n"
	"3:	j   5b				\n"
	"	.previous			\n"
	"	.section __ex_table, \"a\"	\n"
	"	.align 4			\n"
	"	.word   75b, 3b			\n"
	"	.word   76b, 3b			\n"
	"	.word   77b, 3b			\n"
	"	.word   78b, 3b			\n"
	"	.word   79b, 3b			\n"
	"	.previous			\n"
	: "+r"(d_char), "+r"(res)
	: "i"(0)
	: "lp_count", "memory");

	return res;
}

static inline long
__arc_strncpy_from_user(char *dst, const char __user *src, long count)
{
	long res = 0;
	char val;

	if (count == 0)
		return 0;

	__asm__ __volatile__(
	"	mov	lp_count, %5		\n"
	"	lp	3f			\n"
	"1:	ldb.ab  %3, [%2, 1]		\n"
	"	breq.d	%3, 0, 3f               \n"
	"	stb.ab  %3, [%1, 1]		\n"
	"	add	%0, %0, 1	# Num of NON NULL bytes copied	\n"
	"3:								\n"
	"	.section .fixup, \"ax\"		\n"
	"	.align 4			\n"
	"4:	mov %0, %4		# sets @res as -EFAULT	\n"
	"	j   3b				\n"
	"	.previous			\n"
	"	.section __ex_table, \"a\"	\n"
	"	.align 4			\n"
	"	.word   1b, 4b			\n"
	"	.previous			\n"
	: "+r"(res), "+r"(dst), "+r"(src), "=r"(val)
	: "g"(-EFAULT), "r"(count)
	: "lp_count", "memory");

	return res;
}

static inline long __arc_strnlen_user(const char __user *s, long n)
{
	long res, tmp1, cnt;
	char val;

	__asm__ __volatile__(
	"	mov %2, %1			\n"
	"1:	ldb.ab  %3, [%0, 1]		\n"
	"	breq.d  %3, 0, 2f		\n"
	"	sub.f   %2, %2, 1		\n"
	"	bnz 1b				\n"
	"	sub %2, %2, 1			\n"
	"2:	sub %0, %1, %2			\n"
	"3:	;nop				\n"
	"	.section .fixup, \"ax\"		\n"
	"	.align 4			\n"
	"4:	mov %0, 0			\n"
	"	j   3b				\n"
	"	.previous			\n"
	"	.section __ex_table, \"a\"	\n"
	"	.align 4			\n"
	"	.word 1b, 4b			\n"
	"	.previous			\n"
	: "=r"(res), "=r"(tmp1), "=r"(cnt), "=r"(val)
	: "0"(s), "1"(n)
	: "memory");

	return res;
}

#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE

#define INLINE_COPY_TO_USER
#define INLINE_COPY_FROM_USER

#define __clear_user(d, n)		__arc_clear_user(d, n)
#define __strncpy_from_user(d, s, n)	__arc_strncpy_from_user(d, s, n)
#define __strnlen_user(s, n)		__arc_strnlen_user(s, n)
#else
extern unsigned long arc_clear_user_noinline(void __user *to,
		unsigned long n);
extern long arc_strncpy_from_user_noinline (char *dst, const char __user *src,
		long count);
extern long arc_strnlen_user_noinline(const char __user *src, long n);

#define __clear_user(d, n)		arc_clear_user_noinline(d, n)
#define __strncpy_from_user(d, s, n)	arc_strncpy_from_user_noinline(d, s, n)
#define __strnlen_user(s, n)		arc_strnlen_user_noinline(s, n)

#endif

#include <asm/segment.h>
#include <asm-generic/uaccess.h>

#endif
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
43697cb0 VG	2	/*
	3	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
	4	*
43697cb0 VG	5	* vineetg: June 2010
	6	* -__clear_user( ) called multiple times during elf load was byte loop
	7	* converted to do as much word clear as possible.
	8	*
	9	* vineetg: Dec 2009
	10	* -Hand crafted constant propagation for "constant" copy sizes
	11	* -stock kernel shrunk by 33K at -O3
	12	*
	13	* vineetg: Sept 2009
	14	* -Added option to (UN)inline copy_(to\|from)_user to reduce code sz
	15	* -kernel shrunk by 200K even at -O3 (gcc 4.2.1)
	16	* -Enabled when doing -Os
	17	*
	18	* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
	19	*/
	20
	21	#ifndef _ASM_ARC_UACCESS_H
	22	#define _ASM_ARC_UACCESS_H
	23
43697cb0 VG	24	#include <linux/string.h> /* for generic string functions */
	25
	26
db68ce10	27	#define __kernel_ok (uaccess_kernel())
43697cb0 VG	28
43697cb0 VG	29	/*
2547476a	30	* Algorithmically, for __user_ok() we want do:
43697cb0 VG	31	* (start < TASK_SIZE) && (start+len < TASK_SIZE)
	32	* where TASK_SIZE could either be retrieved from thread_info->addr_limit or
	33	* emitted directly in code.
	34	*
	35	* This can however be rewritten as follows:
	36	* (len <= TASK_SIZE) && (start+len < TASK_SIZE)
	37	*
	38	* Because it essentially checks if buffer end is within limit and @len is
	39	* non-ngeative, which implies that buffer start will be within limit too.
	40	*
0752adfd	41	* The reason for rewriting being, for majority of cases, @len is generally
43697cb0 VG	42	* compile time constant, causing first sub-expression to be compile time
	43	* subsumed.
	44	*
	45	* The second part would generate weird large LIMMs e.g. (0x6000_0000 - 0x10),
	46	* so we check for TASK_SIZE using get_fs() since the addr_limit load from mem
	47	* would already have been done at this call site for __kernel_ok()
	48	*
	49	*/
	50	#define __user_ok(addr, sz) (((sz) <= TASK_SIZE) && \
0752adfd	51	((addr) <= (get_fs() - (sz))))
43697cb0 VG	52	#define __access_ok(addr, sz) (unlikely(__kernel_ok) \|\| \
	53	likely(__user_ok((addr), (sz))))
	54
0a5eae45 VG	55	/********* Single byte/hword/word copies ****************/
	56
	57	#define __get_user_fn(sz, u, k) \
	58	({ \
	59	long __ret = 0; /* success by default */ \
	60	switch (sz) { \
	61	case 1: __arc_get_user_one(*(k), u, "ldb", __ret); break; \
	62	case 2: __arc_get_user_one(*(k), u, "ldw", __ret); break; \
	63	case 4: __arc_get_user_one(*(k), u, "ld", __ret); break; \
	64	case 8: __arc_get_user_one_64(*(k), u, __ret); break; \
	65	} \
	66	__ret; \
	67	})
	68
	69	/*
	70	* Returns 0 on success, -EFAULT if not.
	71	* @ret already contains 0 - given that errors will be less likely
	72	* (hence +r asm constraint below).
	73	* In case of error, fixup code will make it -EFAULT
	74	*/
	75	#define __arc_get_user_one(dst, src, op, ret) \
	76	__asm__ __volatile__( \
	77	"1: "op" %1,[%2]\n" \
	78	"2: ;nop\n" \
	79	" .section .fixup, \"ax\"\n" \
	80	" .align 4\n" \
05d9d0b9 VG	81	"3: # return -EFAULT\n" \
	82	" mov %0, %3\n" \
	83	" # zero out dst ptr\n" \
	84	" mov %1, 0\n" \
0a5eae45 VG	85	" j 2b\n" \
	86	" .previous\n" \
	87	" .section __ex_table, \"a\"\n" \
	88	" .align 4\n" \
	89	" .word 1b,3b\n" \
	90	" .previous\n" \
	91	\
	92	: "+r" (ret), "=r" (dst) \
	93	: "r" (src), "ir" (-EFAULT))
	94
	95	#define __arc_get_user_one_64(dst, src, ret) \
	96	__asm__ __volatile__( \
	97	"1: ld %1,[%2]\n" \
	98	"4: ld %R1,[%2, 4]\n" \
	99	"2: ;nop\n" \
	100	" .section .fixup, \"ax\"\n" \
	101	" .align 4\n" \
05d9d0b9 VG	102	"3: # return -EFAULT\n" \
	103	" mov %0, %3\n" \
	104	" # zero out dst ptr\n" \
	105	" mov %1, 0\n" \
	106	" mov %R1, 0\n" \
0a5eae45 VG	107	" j 2b\n" \
	108	" .previous\n" \
	109	" .section __ex_table, \"a\"\n" \
	110	" .align 4\n" \
	111	" .word 1b,3b\n" \
	112	" .word 4b,3b\n" \
	113	" .previous\n" \
	114	\
	115	: "+r" (ret), "=r" (dst) \
	116	: "r" (src), "ir" (-EFAULT))
	117
	118	#define __put_user_fn(sz, u, k) \
	119	({ \
	120	long __ret = 0; /* success by default */ \
	121	switch (sz) { \
	122	case 1: __arc_put_user_one(*(k), u, "stb", __ret); break; \
	123	case 2: __arc_put_user_one(*(k), u, "stw", __ret); break; \
	124	case 4: __arc_put_user_one(*(k), u, "st", __ret); break; \
	125	case 8: __arc_put_user_one_64(*(k), u, __ret); break; \
	126	} \
	127	__ret; \
	128	})
	129
	130	#define __arc_put_user_one(src, dst, op, ret) \
	131	__asm__ __volatile__( \
	132	"1: "op" %1,[%2]\n" \
	133	"2: ;nop\n" \
	134	" .section .fixup, \"ax\"\n" \
	135	" .align 4\n" \
	136	"3: mov %0, %3\n" \
	137	" j 2b\n" \
	138	" .previous\n" \
	139	" .section __ex_table, \"a\"\n" \
	140	" .align 4\n" \
	141	" .word 1b,3b\n" \
	142	" .previous\n" \
	143	\
	144	: "+r" (ret) \
	145	: "r" (src), "r" (dst), "ir" (-EFAULT))
	146
	147	#define __arc_put_user_one_64(src, dst, ret) \
	148	__asm__ __volatile__( \
	149	"1: st %1,[%2]\n" \
	150	"4: st %R1,[%2, 4]\n" \
	151	"2: ;nop\n" \
	152	" .section .fixup, \"ax\"\n" \
	153	" .align 4\n" \
	154	"3: mov %0, %3\n" \
	155	" j 2b\n" \
	156	" .previous\n" \
	157	" .section __ex_table, \"a\"\n" \
	158	" .align 4\n" \
	159	" .word 1b,3b\n" \
	160	" .word 4b,3b\n" \
	161	" .previous\n" \
	162	\
	163	: "+r" (ret) \
	164	: "r" (src), "r" (dst), "ir" (-EFAULT))
	165
	166
43697cb0	167	static inline unsigned long
e13909a4	168	raw_copy_from_user(void to, const void __user from, unsigned long n)
43697cb0 VG	169	{
	170	long res = 0;
	171	char val;
	172	unsigned long tmp1, tmp2, tmp3, tmp4;
	173	unsigned long orig_n = n;
	174
	175	if (n == 0)
	176	return 0;
	177
	178	/* unaligned */
	179	if (((unsigned long)to & 0x3) \|\| ((unsigned long)from & 0x3)) {
	180
	181	unsigned char tmp;
	182
	183	__asm__ __volatile__ (
	184	" mov.f lp_count, %0 \n"
	185	" lpnz 2f \n"
	186	"1: ldb.ab %1, [%3, 1] \n"
	187	" stb.ab %1, [%2, 1] \n"
	188	" sub %0,%0,1 \n"
	189	"2: ;nop \n"
	190	" .section .fixup, \"ax\" \n"
	191	" .align 4 \n"
	192	"3: j 2b \n"
	193	" .previous \n"
	194	" .section __ex_table, \"a\" \n"
	195	" .align 4 \n"
	196	" .word 1b, 3b \n"
	197	" .previous \n"
	198
	199	: "+r" (n),
	200	/*
	201	* Note as an '&' earlyclobber operand to make sure the
	202	* temporary register inside the loop is not the same as
	203	* FROM or TO.
	204	*/
	205	"=&r" (tmp), "+r" (to), "+r" (from)
	206	:
d5e3c55e	207	: "lp_count", "memory");
43697cb0 VG	208
	209	return n;
	210	}
	211
	212	/*
	213	* Hand-crafted constant propagation to reduce code sz of the
	214	* laddered copy 16x,8,4,2,1
	215	*/
	216	if (__builtin_constant_p(orig_n)) {
	217	res = orig_n;
	218
	219	if (orig_n / 16) {
	220	orig_n = orig_n % 16;
	221
	222	__asm__ __volatile__(
	223	" lsr lp_count, %7,4 \n"
	224	" lp 3f \n"
	225	"1: ld.ab %3, [%2, 4] \n"
	226	"11: ld.ab %4, [%2, 4] \n"
	227	"12: ld.ab %5, [%2, 4] \n"
	228	"13: ld.ab %6, [%2, 4] \n"
	229	" st.ab %3, [%1, 4] \n"
	230	" st.ab %4, [%1, 4] \n"
	231	" st.ab %5, [%1, 4] \n"
	232	" st.ab %6, [%1, 4] \n"
	233	" sub %0,%0,16 \n"
	234	"3: ;nop \n"
	235	" .section .fixup, \"ax\" \n"
	236	" .align 4 \n"
	237	"4: j 3b \n"
	238	" .previous \n"
	239	" .section __ex_table, \"a\" \n"
	240	" .align 4 \n"
	241	" .word 1b, 4b \n"
	242	" .word 11b,4b \n"
	243	" .word 12b,4b \n"
	244	" .word 13b,4b \n"
	245	" .previous \n"
	246	: "+r" (res), "+r"(to), "+r"(from),
	247	"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
	248	: "ir"(n)
	249	: "lp_count", "memory");
	250	}
	251	if (orig_n / 8) {
	252	orig_n = orig_n % 8;
	253
	254	__asm__ __volatile__(
	255	"14: ld.ab %3, [%2,4] \n"
	256	"15: ld.ab %4, [%2,4] \n"
	257	" st.ab %3, [%1,4] \n"
	258	" st.ab %4, [%1,4] \n"
	259	" sub %0,%0,8 \n"
	260	"31: ;nop \n"
	261	" .section .fixup, \"ax\" \n"
	262	" .align 4 \n"
	263	"4: j 31b \n"
	264	" .previous \n"
	265	" .section __ex_table, \"a\" \n"
	266	" .align 4 \n"
	267	" .word 14b,4b \n"
	268	" .word 15b,4b \n"
	269	" .previous \n"
	270	: "+r" (res), "+r"(to), "+r"(from),
	271	"=r"(tmp1), "=r"(tmp2)
272	:
273	: "memory");
274	}
275	if (orig_n / 4) {
276	orig_n = orig_n % 4;
277
278	__asm__ __volatile__(
279	"16: ld.ab %3, [%2,4] \n"
280	" st.ab %3, [%1,4] \n"
281	" sub %0,%0,4 \n"
282	"32: ;nop \n"
283	" .section .fixup, \"ax\" \n"
284	" .align 4 \n"
285	"4: j 32b \n"
286	" .previous \n"
287	" .section __ex_table, \"a\" \n"
288	" .align 4 \n"
289	" .word 16b,4b \n"
290	" .previous \n"
291	: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
292	:
293	: "memory");
294	}
295	if (orig_n / 2) {
296	orig_n = orig_n % 2;
297
298	__asm__ __volatile__(
299	"17: ldw.ab %3, [%2,2] \n"
300	" stw.ab %3, [%1,2] \n"
301	" sub %0,%0,2 \n"
302	"33: ;nop \n"
303	" .section .fixup, \"ax\" \n"
304	" .align 4 \n"
305	"4: j 33b \n"
306	" .previous \n"
307	" .section __ex_table, \"a\" \n"
308	" .align 4 \n"
309	" .word 17b,4b \n"
310	" .previous \n"
311	: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
312	:
313	: "memory");
314	}
315	if (orig_n & 1) {
316	__asm__ __volatile__(
317	"18: ldb.ab %3, [%2,2] \n"
318	" stb.ab %3, [%1,2] \n"
319	" sub %0,%0,1 \n"
320	"34: ; nop \n"
321	" .section .fixup, \"ax\" \n"
322	" .align 4 \n"
323	"4: j 34b \n"
324	" .previous \n"
325	" .section __ex_table, \"a\" \n"
326	" .align 4 \n"
327	" .word 18b,4b \n"
328	" .previous \n"
329	: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
330	:
331	: "memory");
332	}
333	} else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */
334
335	__asm__ __volatile__(
336	" mov %0,%3 \n"
337	" lsr.f lp_count, %3,4 \n" /* 16x bytes */
338	" lpnz 3f \n"
339	"1: ld.ab %5, [%2, 4] \n"
340	"11: ld.ab %6, [%2, 4] \n"
341	"12: ld.ab %7, [%2, 4] \n"
342	"13: ld.ab %8, [%2, 4] \n"
343	" st.ab %5, [%1, 4] \n"
344	" st.ab %6, [%1, 4] \n"
345	" st.ab %7, [%1, 4] \n"
346	" st.ab %8, [%1, 4] \n"
347	" sub %0,%0,16 \n"
348	"3: and.f %3,%3,0xf \n" /* stragglers */
349	" bz 34f \n"
350	" bbit0 %3,3,31f \n" /* 8 bytes left */
351	"14: ld.ab %5, [%2,4] \n"
352	"15: ld.ab %6, [%2,4] \n"
353	" st.ab %5, [%1,4] \n"
354	" st.ab %6, [%1,4] \n"
355	" sub.f %0,%0,8 \n"
356	"31: bbit0 %3,2,32f \n" /* 4 bytes left */
357	"16: ld.ab %5, [%2,4] \n"
358	" st.ab %5, [%1,4] \n"
359	" sub.f %0,%0,4 \n"
360	"32: bbit0 %3,1,33f \n" /* 2 bytes left */
361	"17: ldw.ab %5, [%2,2] \n"
362	" stw.ab %5, [%1,2] \n"
363	" sub.f %0,%0,2 \n"
364	"33: bbit0 %3,0,34f \n"
365	"18: ldb.ab %5, [%2,1] \n" /* 1 byte left */
366	" stb.ab %5, [%1,1] \n"
367	" sub.f %0,%0,1 \n"
368	"34: ;nop \n"
369	" .section .fixup, \"ax\" \n"
370	" .align 4 \n"
371	"4: j 34b \n"
372	" .previous \n"
373	" .section __ex_table, \"a\" \n"
374	" .align 4 \n"
375	" .word 1b, 4b \n"
376	" .word 11b,4b \n"
377	" .word 12b,4b \n"
378	" .word 13b,4b \n"
379	" .word 14b,4b \n"
380	" .word 15b,4b \n"
381	" .word 16b,4b \n"
382	" .word 17b,4b \n"
383	" .word 18b,4b \n"
384	" .previous \n"
385	: "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val),
386	"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
387	:
388	: "lp_count", "memory");
389	}
390
391	return res;
392	}
393
43697cb0	394	static inline unsigned long
e13909a4	395	raw_copy_to_user(void __user to, const void from, unsigned long n)
43697cb0 VG	396	{
	397	long res = 0;
	398	char val;
	399	unsigned long tmp1, tmp2, tmp3, tmp4;
	400	unsigned long orig_n = n;
	401
	402	if (n == 0)
	403	return 0;
	404
	405	/* unaligned */
	406	if (((unsigned long)to & 0x3) \|\| ((unsigned long)from & 0x3)) {
	407
	408	unsigned char tmp;
	409
	410	__asm__ __volatile__(
	411	" mov.f lp_count, %0 \n"
	412	" lpnz 3f \n"
	413	" ldb.ab %1, [%3, 1] \n"
	414	"1: stb.ab %1, [%2, 1] \n"
	415	" sub %0, %0, 1 \n"
	416	"3: ;nop \n"
	417	" .section .fixup, \"ax\" \n"
	418	" .align 4 \n"
	419	"4: j 3b \n"
	420	" .previous \n"
	421	" .section __ex_table, \"a\" \n"
	422	" .align 4 \n"
	423	" .word 1b, 4b \n"
	424	" .previous \n"
	425
	426	: "+r" (n),
	427	/* Note as an '&' earlyclobber operand to make sure the
	428	* temporary register inside the loop is not the same as
	429	* FROM or TO.
	430	*/
	431	"=&r" (tmp), "+r" (to), "+r" (from)
	432	:
d5e3c55e	433	: "lp_count", "memory");
43697cb0 VG	434
	435	return n;
	436	}
	437
	438	if (__builtin_constant_p(orig_n)) {
	439	res = orig_n;
	440
	441	if (orig_n / 16) {
	442	orig_n = orig_n % 16;
	443
	444	__asm__ __volatile__(
	445	" lsr lp_count, %7,4 \n"
	446	" lp 3f \n"
	447	" ld.ab %3, [%2, 4] \n"
	448	" ld.ab %4, [%2, 4] \n"
	449	" ld.ab %5, [%2, 4] \n"
	450	" ld.ab %6, [%2, 4] \n"
	451	"1: st.ab %3, [%1, 4] \n"
	452	"11: st.ab %4, [%1, 4] \n"
	453	"12: st.ab %5, [%1, 4] \n"
	454	"13: st.ab %6, [%1, 4] \n"
	455	" sub %0, %0, 16 \n"
	456	"3:;nop \n"
	457	" .section .fixup, \"ax\" \n"
	458	" .align 4 \n"
	459	"4: j 3b \n"
	460	" .previous \n"
	461	" .section __ex_table, \"a\" \n"
	462	" .align 4 \n"
	463	" .word 1b, 4b \n"
	464	" .word 11b,4b \n"
	465	" .word 12b,4b \n"
	466	" .word 13b,4b \n"
	467	" .previous \n"
	468	: "+r" (res), "+r"(to), "+r"(from),
	469	"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
	470	: "ir"(n)
	471	: "lp_count", "memory");
	472	}
	473	if (orig_n / 8) {
	474	orig_n = orig_n % 8;
	475
	476	__asm__ __volatile__(
	477	" ld.ab %3, [%2,4] \n"
	478	" ld.ab %4, [%2,4] \n"
	479	"14: st.ab %3, [%1,4] \n"
	480	"15: st.ab %4, [%1,4] \n"
	481	" sub %0, %0, 8 \n"
	482	"31:;nop \n"
	483	" .section .fixup, \"ax\" \n"
	484	" .align 4 \n"
	485	"4: j 31b \n"
	486	" .previous \n"
	487	" .section __ex_table, \"a\" \n"
	488	" .align 4 \n"
	489	" .word 14b,4b \n"
	490	" .word 15b,4b \n"
	491	" .previous \n"
	492	: "+r" (res), "+r"(to), "+r"(from),
	493	"=r"(tmp1), "=r"(tmp2)
	494	:
	495	: "memory");
	496	}
	497	if (orig_n / 4) {
498	orig_n = orig_n % 4;
499
500	__asm__ __volatile__(
501	" ld.ab %3, [%2,4] \n"
502	"16: st.ab %3, [%1,4] \n"
503	" sub %0, %0, 4 \n"
504	"32:;nop \n"
505	" .section .fixup, \"ax\" \n"
506	" .align 4 \n"
507	"4: j 32b \n"
508	" .previous \n"
509	" .section __ex_table, \"a\" \n"
510	" .align 4 \n"
511	" .word 16b,4b \n"
512	" .previous \n"
513	: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
514	:
515	: "memory");
516	}
517	if (orig_n / 2) {
518	orig_n = orig_n % 2;
519
520	__asm__ __volatile__(
521	" ldw.ab %3, [%2,2] \n"
522	"17: stw.ab %3, [%1,2] \n"
523	" sub %0, %0, 2 \n"
524	"33:;nop \n"
525	" .section .fixup, \"ax\" \n"
526	" .align 4 \n"
527	"4: j 33b \n"
528	" .previous \n"
529	" .section __ex_table, \"a\" \n"
530	" .align 4 \n"
531	" .word 17b,4b \n"
532	" .previous \n"
533	: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
534	:
535	: "memory");
536	}
537	if (orig_n & 1) {
538	__asm__ __volatile__(
539	" ldb.ab %3, [%2,1] \n"
540	"18: stb.ab %3, [%1,1] \n"
541	" sub %0, %0, 1 \n"
542	"34: ;nop \n"
543	" .section .fixup, \"ax\" \n"
544	" .align 4 \n"
545	"4: j 34b \n"
546	" .previous \n"
547	" .section __ex_table, \"a\" \n"
548	" .align 4 \n"
549	" .word 18b,4b \n"
550	" .previous \n"
551	: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
552	:
553	: "memory");
554	}
555	} else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */
556
557	__asm__ __volatile__(
558	" mov %0,%3 \n"
559	" lsr.f lp_count, %3,4 \n" /* 16x bytes */
560	" lpnz 3f \n"
561	" ld.ab %5, [%2, 4] \n"
562	" ld.ab %6, [%2, 4] \n"
563	" ld.ab %7, [%2, 4] \n"
564	" ld.ab %8, [%2, 4] \n"
565	"1: st.ab %5, [%1, 4] \n"
566	"11: st.ab %6, [%1, 4] \n"
567	"12: st.ab %7, [%1, 4] \n"
568	"13: st.ab %8, [%1, 4] \n"
569	" sub %0, %0, 16 \n"
570	"3: and.f %3,%3,0xf \n" /* stragglers */
571	" bz 34f \n"
572	" bbit0 %3,3,31f \n" /* 8 bytes left */
573	" ld.ab %5, [%2,4] \n"
574	" ld.ab %6, [%2,4] \n"
575	"14: st.ab %5, [%1,4] \n"
576	"15: st.ab %6, [%1,4] \n"
577	" sub.f %0, %0, 8 \n"
578	"31: bbit0 %3,2,32f \n" /* 4 bytes left */
579	" ld.ab %5, [%2,4] \n"
580	"16: st.ab %5, [%1,4] \n"
581	" sub.f %0, %0, 4 \n"
582	"32: bbit0 %3,1,33f \n" /* 2 bytes left */
583	" ldw.ab %5, [%2,2] \n"
584	"17: stw.ab %5, [%1,2] \n"
585	" sub.f %0, %0, 2 \n"
586	"33: bbit0 %3,0,34f \n"
587	" ldb.ab %5, [%2,1] \n" /* 1 byte left */
588	"18: stb.ab %5, [%1,1] \n"
589	" sub.f %0, %0, 1 \n"
590	"34: ;nop \n"
591	" .section .fixup, \"ax\" \n"
592	" .align 4 \n"
593	"4: j 34b \n"
594	" .previous \n"
595	" .section __ex_table, \"a\" \n"
596	" .align 4 \n"
597	" .word 1b, 4b \n"
598	" .word 11b,4b \n"
599	" .word 12b,4b \n"
600	" .word 13b,4b \n"
601	" .word 14b,4b \n"
602	" .word 15b,4b \n"
603	" .word 16b,4b \n"
604	" .word 17b,4b \n"
605	" .word 18b,4b \n"
606	" .previous \n"
607	: "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val),
608	"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
609	:
610	: "lp_count", "memory");
611	}
612
613	return res;
614	}
615
616	static inline unsigned long __arc_clear_user(void __user *to, unsigned long n)
617	{
618	long res = n;
619	unsigned char *d_char = to;
620
621	__asm__ __volatile__(
622	" bbit0 %0, 0, 1f \n"
623	"75: stb.ab %2, [%0,1] \n"
624	" sub %1, %1, 1 \n"
625	"1: bbit0 %0, 1, 2f \n"
626	"76: stw.ab %2, [%0,2] \n"
627	" sub %1, %1, 2 \n"
628	"2: asr.f lp_count, %1, 2 \n"
629	" lpnz 3f \n"
630	"77: st.ab %2, [%0,4] \n"
631	" sub %1, %1, 4 \n"
632	"3: bbit0 %1, 1, 4f \n"
633	"78: stw.ab %2, [%0,2] \n"
634	" sub %1, %1, 2 \n"
635	"4: bbit0 %1, 0, 5f \n"
636	"79: stb.ab %2, [%0,1] \n"
637	" sub %1, %1, 1 \n"
638	"5: \n"
639	" .section .fixup, \"ax\" \n"
640	" .align 4 \n"
641	"3: j 5b \n"
642	" .previous \n"
643	" .section __ex_table, \"a\" \n"
644	" .align 4 \n"
645	" .word 75b, 3b \n"
646	" .word 76b, 3b \n"
647	" .word 77b, 3b \n"
648	" .word 78b, 3b \n"
649	" .word 79b, 3b \n"
650	" .previous \n"
651	: "+r"(d_char), "+r"(res)
652	: "i"(0)
d5e3c55e	653	: "lp_count", "memory");
43697cb0 VG	654
	655	return res;
	656	}
	657
	658	static inline long
	659	__arc_strncpy_from_user(char dst, const char __user src, long count)
	660	{
8922bc30	661	long res = 0;
43697cb0	662	char val;
43697cb0 VG	663
	664	if (count == 0)
	665	return 0;
	666
	667	__asm__ __volatile__(
79435ac7	668	" mov lp_count, %5 \n"
8922bc30	669	" lp 3f \n"
43697cb0	670	"1: ldb.ab %3, [%2, 1] \n"
8922bc30	671	" breq.d %3, 0, 3f \n"
43697cb0	672	" stb.ab %3, [%1, 1] \n"
8922bc30 VG	673	" add %0, %0, 1 # Num of NON NULL bytes copied \n"
8922bc30 VG	674	"3: \n"
43697cb0 VG	675	" .section .fixup, \"ax\" \n"
43697cb0 VG	676	" .align 4 \n"
8922bc30	677	"4: mov %0, %4 # sets @res as -EFAULT \n"
43697cb0 VG	678	" j 3b \n"
	679	" .previous \n"
	680	" .section __ex_table, \"a\" \n"
	681	" .align 4 \n"
	682	" .word 1b, 4b \n"
	683	" .previous \n"
8922bc30	684	: "+r"(res), "+r"(dst), "+r"(src), "=r"(val)
79435ac7	685	: "g"(-EFAULT), "r"(count)
d5e3c55e	686	: "lp_count", "memory");
43697cb0 VG	687
	688	return res;
	689	}
	690
	691	static inline long __arc_strnlen_user(const char __user *s, long n)
	692	{
	693	long res, tmp1, cnt;
	694	char val;
	695
	696	__asm__ __volatile__(
	697	" mov %2, %1 \n"
	698	"1: ldb.ab %3, [%0, 1] \n"
	699	" breq.d %3, 0, 2f \n"
	700	" sub.f %2, %2, 1 \n"
	701	" bnz 1b \n"
	702	" sub %2, %2, 1 \n"
	703	"2: sub %0, %1, %2 \n"
	704	"3: ;nop \n"
	705	" .section .fixup, \"ax\" \n"
	706	" .align 4 \n"
	707	"4: mov %0, 0 \n"
	708	" j 3b \n"
	709	" .previous \n"
	710	" .section __ex_table, \"a\" \n"
	711	" .align 4 \n"
	712	" .word 1b, 4b \n"
	713	" .previous \n"
	714	: "=r"(res), "=r"(tmp1), "=r"(cnt), "=r"(val)
	715	: "0"(s), "1"(n)
	716	: "memory");
	717
	718	return res;
	719	}
	720
	721	#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
e13909a4 VG	722
	723	#define INLINE_COPY_TO_USER
	724	#define INLINE_COPY_FROM_USER
	725
43697cb0 VG	726	#define __clear_user(d, n) __arc_clear_user(d, n)
	727	#define __strncpy_from_user(d, s, n) __arc_strncpy_from_user(d, s, n)
	728	#define __strnlen_user(s, n) __arc_strnlen_user(s, n)
	729	#else
43697cb0 VG	730	extern unsigned long arc_clear_user_noinline(void __user *to,
	731	unsigned long n);
	732	extern long arc_strncpy_from_user_noinline (char dst, const char __user src,
	733	long count);
	734	extern long arc_strnlen_user_noinline(const char __user *src, long n);
	735
43697cb0 VG	736	#define __clear_user(d, n) arc_clear_user_noinline(d, n)
	737	#define __strncpy_from_user(d, s, n) arc_strncpy_from_user_noinline(d, s, n)
	738	#define __strnlen_user(s, n) arc_strnlen_user_noinline(s, n)
	739
	740	#endif
	741
737d42f7	742	#include <asm/segment.h>
43697cb0 VG	743	#include <asm-generic/uaccess.h>
43697cb0 VG	744
43697cb0	745	#endif