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