1/* SPDX-License-Identifier: GPL-2.0 */
2#include <linux/linkage.h>
3#include <asm/assembler.h>
4#include "abort-macro.S"
5/*
6 * Function: v4t_early_abort
7 *
8 * Params  : r2 = pt_regs
9 *	   : r4 = aborted context pc
10 *	   : r5 = aborted context psr
11 *
12 * Returns : r4 - r11, r13 preserved
13 *
14 * Purpose : obtain information about current aborted instruction.
15 * Note: we read user space.  This means we might cause a data
16 * abort here if the I-TLB and D-TLB aren't seeing the same
17 * picture.  Unfortunately, this does happen.  We live with it.
18 */
19	.align	5
20ENTRY(v4t_early_abort)
21	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
22	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
23	do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
24	ldreq	r3, [r4]			@ read aborted ARM instruction
25	bic	r1, r1, #1 << 11 | 1 << 10	@ clear bits 11 and 10 of FSR
26	tst	r3, #1 << 20			@ check write
27	orreq	r1, r1, #1 << 11
28	b	do_DataAbort
29