blob: 4f18f9e87bae9058700287a9fce5e529e8b90b31 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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