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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#include <linux/linkage.h>
3#include <asm/assembler.h>
4#include "abort-macro.S"
5/*
6 * Function: v4t_early_abort
7 *
Russell Kingda740472011-06-26 16:01:26 +01008 * Params : r2 = pt_regs
9 * : r4 = aborted context pc
Russell King3e287be2011-06-26 14:35:07 +010010 * : r5 = aborted context psr
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
Russell Kingda740472011-06-26 16:01:26 +010012 * Returns : r4 - r11, r13 preserved
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
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
Russell King3e287be2011-06-26 14:35:07 +010023 do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
24 ldreq r3, [r4] @ read aborted ARM instruction
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 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
Russell Kingda740472011-06-26 16:01:26 +010028 b do_DataAbort