tile: remove stale arch/tile/kernel/futex_64.S

/*

 * Copyright 2011 Tilera Corporation. All Rights Reserved.

 *

 *   This program is free software; you can redistribute it and/or

 *   modify it under the terms of the GNU General Public License

 *   as published by the Free Software Foundation, version 2.

 *

 *   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, GOOD TITLE or

 *   NON INFRINGEMENT.  See the GNU General Public License for

 *   more details.

 *

 * Atomically access user memory, but use MMU to avoid propagating

 * kernel exceptions.

 */

#include <linux/linkage.h>

#include <asm/errno.h>

#include <asm/futex.h>

#include <asm/page.h>

#include <asm/processor.h>

/*

 * Provide a set of atomic memory operations supporting <asm/futex.h>.

 *

 * r0: user address to manipulate

 * r1: new value to write, or for cmpxchg, old value to compare against

 * r2: (cmpxchg only) new value to write

 *

 * Return __get_user struct, r0 with value, r1 with error.

 */

#define FUTEX_OP(name, ...) \

STD_ENTRY(futex_##name)			\

	__VA_ARGS__;			\

	{				\

	 move   r1, zero;		\

	 jrp    lr			\

	};				\

	STD_ENDPROC(futex_##name);	\

	.pushsection __ex_table,"a";	\

	.quad 1b, get_user_fault;	\

	.popsection

	.pushsection .fixup,"ax"

get_user_fault:

	{ movei r1, -EFAULT; jrp lr }

	ENDPROC(get_user_fault)

	.popsection

FUTEX_OP(cmpxchg, mtspr CMPEXCH_VALUE, r1; 1: cmpexch4 r0, r0, r2)

FUTEX_OP(set, 1: exch4 r0, r0, r1)

FUTEX_OP(add, 1: fetchadd4 r0, r0, r1)

FUTEX_OP(or, 1: fetchor4 r0, r0, r1)

FUTEX_OP(andn, nor r1, r1, zero; 1: fetchand4 r0, r0, r1)