1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/linkage.h> 3 #include <asm/assembler.h> 4 /* 5 * Function: v4_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 * Note: we read user space. This means we might cause a data 15 * abort here if the I-TLB and D-TLB aren't seeing the same 16 * picture. Unfortunately, this does happen. We live with it. 17 */ 18 .align 5 19 ENTRY(v4_early_abort) 20 mrc p15, 0, r1, c5, c0, 0 @ get FSR 21 mrc p15, 0, r0, c6, c0, 0 @ get FAR 22 ldr r3, [r4] @ read aborted ARM instruction 23 uaccess_disable ip @ disable userspace access 24 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR 25 tst r3, #1 << 20 @ L = 1 -> write? 26 orreq r1, r1, #1 << 11 @ yes. 27 b do_DataAbort