1/* SPDX-License-Identifier: GPL-2.0 */
 2#include <linux/linkage.h>
 3#include <asm/assembler.h>
 4/*
 5 * Function: v4_early_abort
 6 *
 7 * Params  : r2 = pt_regs
 8 *	   : r4 = aborted context pc
 9 *	   : r5 = aborted context psr
10 *
11 * Returns : r4 - r11, r13 preserved
12 *
13 * Purpose : obtain information about current aborted instruction.
14 * Note: we read user space.  This means we might cause a data
15 * abort here if the I-TLB and D-TLB aren't seeing the same
16 * picture.  Unfortunately, this does happen.  We live with it.
17 */
18	.align	5
19ENTRY(v4_early_abort)
20	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
21	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
22	ldr	r3, [r4]			@ read aborted ARM instruction
23	uaccess_disable ip			@ disable userspace access
24	bic	r1, r1, #1 << 11 | 1 << 10	@ clear bits 11 and 10 of FSR
25	tst	r3, #1 << 20			@ L = 1 -> write?
26	orreq	r1, r1, #1 << 11		@ yes.
27	b	do_DataAbort

 
 1#include <linux/linkage.h>
 2#include <asm/assembler.h>
 3/*
 4 * Function: v4_early_abort
 5 *
 6 * Params  : r2 = pt_regs
 7 *	   : r4 = aborted context pc
 8 *	   : r5 = aborted context psr
 9 *
10 * Returns : r4 - r11, r13 preserved
11 *
12 * Purpose : obtain information about current aborted instruction.
13 * Note: we read user space.  This means we might cause a data
14 * abort here if the I-TLB and D-TLB aren't seeing the same
15 * picture.  Unfortunately, this does happen.  We live with it.
16 */
17	.align	5
18ENTRY(v4_early_abort)
19	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
20	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
21	ldr	r3, [r4]			@ read aborted ARM instruction
 
22	bic	r1, r1, #1 << 11 | 1 << 10	@ clear bits 11 and 10 of FSR
23	tst	r3, #1 << 20			@ L = 1 -> write?
24	orreq	r1, r1, #1 << 11		@ yes.
25	b	do_DataAbort