1#include <linux/linkage.h> 2#include <asm/assembler.h> 3/* 4 * Function: v4_early_abort 5 * 6 * Params : r2 = pt_regs 7 * : r4 = aborted context pc 8 * : r5 = aborted context psr 9 * 10 * Returns : r4 - r11, r13 preserved 11 * 12 * Purpose : obtain information about current aborted instruction. 13 * Note: we read user space. This means we might cause a data 14 * abort here if the I-TLB and D-TLB aren't seeing the same 15 * picture. Unfortunately, this does happen. We live with it. 16 */ 17 .align 5 18ENTRY(v4_early_abort) 19 mrc p15, 0, r1, c5, c0, 0 @ get FSR 20 mrc p15, 0, r0, c6, c0, 0 @ get FAR 21 ldr r3, [r4] @ read aborted ARM instruction 22 uaccess_disable ip @ disable userspace access 23 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR 24 tst r3, #1 << 20 @ L = 1 -> write? 25 orreq r1, r1, #1 << 11 @ yes. 26 b do_DataAbort 27