/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/linkage.h>
#include <asm/assembler.h>
#include "abort-macro.S"
/*
* Function : v6_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 .
*/
.arch armv6k
.align 5
ENTRY(v6_early_abort)
mrc p15, 0 , r1, c5, c0, 0 @ get FSR
mrc p15, 0 , r0, c6, c0, 0 @ get FAR
/*
* Faulty SWP instruction on 1136 doesn ' t set bit 11 in DFSR .
*/
#ifdef CONFIG_ARM_ERRATA_326103
ldr ip, =0 x4107b36
mrc p15, 0 , r3, c0, c0, 0 @ get processor id
teq ip, r3, lsr #4 @ r0 ARM1136?
bne 1 f
tst r5, #PSR_J_BIT @ Java?
tsteq r5, #PSR_T_BIT @ Thumb?
bne 1 f
bic r1, r1, #1 << 11 @ clear bit 11 of FSR
ldr r3, [r4] @ read aborted ARM instruction
ARM_BE8(rev r3, r3)
teq_ldrd tmp=ip, insn=r3 @ insn was LDRD?
beq 1 f @ yes
tst r3, #1 << 20 @ L = 0 -> write
orreq r1, r1, #1 << 11 @ yes.
#endif
1 : uaccess_disable ip @ disable userspace access
b do_DataAbort
Messung V0.5 in Prozent C=94 H=100 G=96
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