1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun#include <linux/linkage.h> 3*4882a593Smuzhiyun#include <asm/assembler.h> 4*4882a593Smuzhiyun#include "abort-macro.S" 5*4882a593Smuzhiyun/* 6*4882a593Smuzhiyun * Function: v4t_early_abort 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * Params : r2 = pt_regs 9*4882a593Smuzhiyun * : r4 = aborted context pc 10*4882a593Smuzhiyun * : r5 = aborted context psr 11*4882a593Smuzhiyun * 12*4882a593Smuzhiyun * Returns : r4 - r11, r13 preserved 13*4882a593Smuzhiyun * 14*4882a593Smuzhiyun * Purpose : obtain information about current aborted instruction. 15*4882a593Smuzhiyun * Note: we read user space. This means we might cause a data 16*4882a593Smuzhiyun * abort here if the I-TLB and D-TLB aren't seeing the same 17*4882a593Smuzhiyun * picture. Unfortunately, this does happen. We live with it. 18*4882a593Smuzhiyun */ 19*4882a593Smuzhiyun .align 5 20*4882a593SmuzhiyunENTRY(v4t_early_abort) 21*4882a593Smuzhiyun mrc p15, 0, r1, c5, c0, 0 @ get FSR 22*4882a593Smuzhiyun mrc p15, 0, r0, c6, c0, 0 @ get FAR 23*4882a593Smuzhiyun do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3 24*4882a593Smuzhiyun ldreq r3, [r4] @ read aborted ARM instruction 25*4882a593Smuzhiyun bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR 26*4882a593Smuzhiyun tst r3, #1 << 20 @ check write 27*4882a593Smuzhiyun orreq r1, r1, #1 << 11 28*4882a593Smuzhiyun b do_DataAbort 29