1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * The ARM LDRD and Thumb LDRSB instructions u
4 * differently than every other instruction, s
5 * even though the instructions are read instr
6 * during an abort the instructions will be tr
7 * handler will raise a signal from unwriteabl
8 * fault. We have to specifically check for th
9 * from the abort handlers to treat them prope
10 *
11 */
12
13 .macro do_thumb_abort, fsr, pc, psr,
14 tst \psr, #PSR_T_BIT
15 beq not_thumb
16 ldrh \tmp, [\pc]
17 uaccess_disable ip
18 and \tmp, \tmp, # 0xfe00
19 cmp \tmp, # 0x5600
20 orreq \tmp, \tmp, #1 << 11
21 tst \tmp, #1 << 11
22 orreq \fsr, \fsr, #1 << 11
23 b do_DataAbort
24 not_thumb:
25 .endm
26
27 /*
28 * We check for the following instruction enco
29 *
30 * [27:25] == 000
31 * [7:4] == 1101
32 * [20] == 0
33 */
34 .macro teq_ldrd, tmp, insn
35 mov \tmp, #0x0e100000
36 orr \tmp, #0x000000f0
37 and \tmp, \insn, \tmp
38 teq \tmp, #0x000000d0
39 .endm
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