1*b2441318SGreg Kroah-Hartman/* SPDX-License-Identifier: GPL-2.0 */ 21da177e4SLinus Torvalds#include <linux/linkage.h> 31da177e4SLinus Torvalds#include <asm/assembler.h> 41da177e4SLinus Torvalds#include "abort-macro.S" 51da177e4SLinus Torvalds/* 61da177e4SLinus Torvalds * Function: v5t_early_abort 71da177e4SLinus Torvalds * 8da740472SRussell King * Params : r2 = pt_regs 9da740472SRussell King * : r4 = aborted context pc 103e287becSRussell King * : r5 = aborted context psr 111da177e4SLinus Torvalds * 12da740472SRussell King * Returns : r4 - r11, r13 preserved 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Purpose : obtain information about current aborted instruction. 151da177e4SLinus Torvalds * Note: we read user space. This means we might cause a data 161da177e4SLinus Torvalds * abort here if the I-TLB and D-TLB aren't seeing the same 171da177e4SLinus Torvalds * picture. Unfortunately, this does happen. We live with it. 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds .align 5 201da177e4SLinus TorvaldsENTRY(v5t_early_abort) 211da177e4SLinus Torvalds mrc p15, 0, r1, c5, c0, 0 @ get FSR 221da177e4SLinus Torvalds mrc p15, 0, r0, c6, c0, 0 @ get FAR 233e287becSRussell King do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3 243e287becSRussell King ldreq r3, [r4] @ read aborted ARM instruction 252190fed6SRussell King uaccess_disable ip @ disable user access 261da177e4SLinus Torvalds bic r1, r1, #1 << 11 @ clear bits 11 of FSR 2708446b12SRussell King teq_ldrd tmp=ip, insn=r3 @ insn was LDRD? 2808446b12SRussell King beq do_DataAbort @ yes 291da177e4SLinus Torvalds tst r3, #1 << 20 @ check write 301da177e4SLinus Torvalds orreq r1, r1, #1 << 11 31da740472SRussell King b do_DataAbort 32