1#include <linux/linkage.h> 2#include <asm/assembler.h> 3#include "abort-macro.S" 4/* 5 * Function: v4t_early_abort 6 * 7 * Params : r2 = address of aborted instruction 8 * : r3 = saved SPSR 9 * 10 * Returns : r0 = address of abort 11 * : r1 = FSR, bit 11 = write 12 * : r2-r8 = corrupted 13 * : r9 = preserved 14 * : sp = pointer to registers 15 * 16 * Purpose : obtain information about current aborted instruction. 17 * Note: we read user space. This means we might cause a data 18 * abort here if the I-TLB and D-TLB aren't seeing the same 19 * picture. Unfortunately, this does happen. We live with it. 20 */ 21 .align 5 22ENTRY(v4t_early_abort) 23 mrc p15, 0, r1, c5, c0, 0 @ get FSR 24 mrc p15, 0, r0, c6, c0, 0 @ get FAR 25 do_thumb_abort 26 ldreq r3, [r2] @ read aborted ARM instruction 27 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR 28 tst r3, #1 << 20 @ check write 29 orreq r1, r1, #1 << 11 30 mov pc, lr 31