blob: 9910123079cebca1e544fd414c3c66a1c04dbaa3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Russell Kingbe020f82011-06-26 13:42:01 +010025 do_thumb_abort fsr=r1, pc=r2, psr=r3, tmp=r3
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 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