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: v6_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(v6_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/* 24*4882a593Smuzhiyun * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR. 25*4882a593Smuzhiyun */ 26*4882a593Smuzhiyun#ifdef CONFIG_ARM_ERRATA_326103 27*4882a593Smuzhiyun ldr ip, =0x4107b36 28*4882a593Smuzhiyun mrc p15, 0, r3, c0, c0, 0 @ get processor id 29*4882a593Smuzhiyun teq ip, r3, lsr #4 @ r0 ARM1136? 30*4882a593Smuzhiyun bne 1f 31*4882a593Smuzhiyun tst r5, #PSR_J_BIT @ Java? 32*4882a593Smuzhiyun tsteq r5, #PSR_T_BIT @ Thumb? 33*4882a593Smuzhiyun bne 1f 34*4882a593Smuzhiyun bic r1, r1, #1 << 11 @ clear bit 11 of FSR 35*4882a593Smuzhiyun ldr r3, [r4] @ read aborted ARM instruction 36*4882a593Smuzhiyun ARM_BE8(rev r3, r3) 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun teq_ldrd tmp=ip, insn=r3 @ insn was LDRD? 39*4882a593Smuzhiyun beq 1f @ yes 40*4882a593Smuzhiyun tst r3, #1 << 20 @ L = 0 -> write 41*4882a593Smuzhiyun orreq r1, r1, #1 << 11 @ yes. 42*4882a593Smuzhiyun#endif 43*4882a593Smuzhiyun1: uaccess_disable ip @ disable userspace access 44*4882a593Smuzhiyun b do_DataAbort 45