1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun#include <linux/linkage.h> 3*4882a593Smuzhiyun#include <asm/assembler.h> 4*4882a593Smuzhiyun/* 5*4882a593Smuzhiyun * Function: v7_early_abort 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Params : r2 = pt_regs 8*4882a593Smuzhiyun * : r4 = aborted context pc 9*4882a593Smuzhiyun * : r5 = aborted context psr 10*4882a593Smuzhiyun * 11*4882a593Smuzhiyun * Returns : r4 - r11, r13 preserved 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * Purpose : obtain information about current aborted instruction. 14*4882a593Smuzhiyun */ 15*4882a593Smuzhiyun .align 5 16*4882a593SmuzhiyunENTRY(v7_early_abort) 17*4882a593Smuzhiyun mrc p15, 0, r1, c5, c0, 0 @ get FSR 18*4882a593Smuzhiyun mrc p15, 0, r0, c6, c0, 0 @ get FAR 19*4882a593Smuzhiyun uaccess_disable ip @ disable userspace access 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun /* 22*4882a593Smuzhiyun * V6 code adjusts the returned DFSR. 23*4882a593Smuzhiyun * New designs should not need to patch up faults. 24*4882a593Smuzhiyun */ 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun#if defined(CONFIG_VERIFY_PERMISSION_FAULT) 27*4882a593Smuzhiyun /* 28*4882a593Smuzhiyun * Detect erroneous permission failures and fix 29*4882a593Smuzhiyun */ 30*4882a593Smuzhiyun ldr r3, =0x40d @ On permission fault 31*4882a593Smuzhiyun and r3, r1, r3 32*4882a593Smuzhiyun cmp r3, #0x0d 33*4882a593Smuzhiyun bne do_DataAbort 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR 36*4882a593Smuzhiyun isb 37*4882a593Smuzhiyun mrc p15, 0, ip, c7, c4, 0 @ Read the PAR 38*4882a593Smuzhiyun and r3, ip, #0x7b @ On translation fault 39*4882a593Smuzhiyun cmp r3, #0x0b 40*4882a593Smuzhiyun bne do_DataAbort 41*4882a593Smuzhiyun bic r1, r1, #0xf @ Fix up FSR FS[5:0] 42*4882a593Smuzhiyun and ip, ip, #0x7e 43*4882a593Smuzhiyun orr r1, r1, ip, LSR #1 44*4882a593Smuzhiyun#endif 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun b do_DataAbort 47*4882a593SmuzhiyunENDPROC(v7_early_abort) 48