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