/*
 * Copyright (c) 2009, Code Aurora Forum. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Code Aurora Forum nor
 *       the names of its contributors may be used to endorse or promote
 *       products derived from this software without specific prior written
 *       permission.
 *
 * Alternatively, provided that this notice is retained in full, this software
 * may be relicensed by the recipient under the terms of the GNU General Public
 * License version 2 ("GPL") and only version 2, in which case the provisions of
 * the GPL apply INSTEAD OF those given above.  If the recipient relicenses the
 * software under the GPL, then the identification text in the MODULE_LICENSE
 * macro must be changed to reflect "GPLv2" instead of "Dual BSD/GPL".  Once a
 * recipient changes the license terms to the GPL, subsequent recipients shall
 * not relicense under alternate licensing terms, including the BSD or dual
 * BSD/GPL terms.  In addition, the following license statement immediately
 * below and between the words START and END shall also then apply when this
 * software is relicensed under the GPL:
 *
 * START
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 and only 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * END
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/linkage.h>
#include <asm/assembler.h>
/*
 * Function: v7_early_abort
 *
 * Params  : r2 = address of aborted instruction
 *         : r3 = saved SPSR
 *
 * Returns : r0 = address of abort
 *	   : r1 = FSR, bit 11 = write
 *	   : r2-r8 = corrupted
 *	   : r9 = preserved
 *	   : sp = pointer to registers
 *
 * Purpose : obtain information about current aborted instruction.
 */
	.align	5
ENTRY(v7_early_abort)
	/*
	 * The effect of data aborts on on the exclusive access monitor are
	 * UNPREDICTABLE. Do a CLREX to clear the state
	 */
	clrex

	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
	mrc	p15, 0, r0, c6, c0, 0		@ get FAR

	/*
	 * V6 code adjusts the returned DFSR.
	 * New designs should not need to patch up faults.
	 */

#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
	/*
	 * Detect erroneous permission failures and fix
	 */
	ldr	r3, =0x40d			@ On permission fault
	and	r3, r1, r3
	cmp	r3, #0x0d
	movne	pc, lr

	mcr	p15, 0, r0, c7, c8, 0   	@ Retranslate FAR
	isb
	mrc	p15, 0, r2, c7, c4, 0   	@ Read the PAR
	and	r3, r2, #0x7b   		@ On translation fault
	cmp	r3, #0x0b
	movne	pc, lr
	bic	r1, r1, #0xf			@ Fix up FSR FS[5:0]
	and	r2, r2, #0x7e
	orr	r1, r1, r2, LSR #1
#endif

	mov	pc, lr
ENDPROC(v7_early_abort)