1#include <linux/linkage.h> 2#include <asm/assembler.h> 3/* 4 * Function: v4_early_abort 5 * 6 * Params : r2 = address of aborted instruction 7 * : r3 = saved SPSR 8 * 9 * Returns : r0 = address of abort 10 * : r1 = FSR, bit 11 = write 11 * : r2-r8 = corrupted 12 * : r9 = preserved 13 * : sp = pointer to registers 14 * 15 * Purpose : obtain information about current aborted instruction. 16 * Note: we read user space. This means we might cause a data 17 * abort here if the I-TLB and D-TLB aren't seeing the same 18 * picture. Unfortunately, this does happen. We live with it. 19 */ 20 .align 5 21ENTRY(v4_early_abort) 22 mrc p15, 0, r1, c5, c0, 0 @ get FSR 23 mrc p15, 0, r0, c6, c0, 0 @ get FAR 24 ldr r3, [r2] @ read aborted ARM instruction 25 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR 26 tst r3, #1 << 20 @ L = 1 -> write? 27 orreq r1, r1, #1 << 11 @ yes. 28 mov pc, lr 29 30 31