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ARM: kprobes: Decode 32-bit Thumb memory hint instructions

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We'll treat the preload instructions as nops as they are just
performance hints.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst 2011-07-03 15:00:42 +01:00 committed by Tixy
parent 6a0d1a1c56
commit 46009cc5c5
1 changed files with 33 additions and 0 deletions
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33
arch/arm/kernel/kprobes-thumb.c
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@ -489,6 +489,33 @@ static const union decode_item t32_table_1111_0xxx___1[] = {
DECODE_END
};
static const union decode_item t32_table_1111_100x_x0x1__1111[] = {
/* Memory hints */
/* PLD (literal) 1111 1000 x001 1111 1111 xxxx xxxx xxxx */
/* PLI (literal) 1111 1001 x001 1111 1111 xxxx xxxx xxxx */
DECODE_SIMULATE (0xfe7ff000, 0xf81ff000, kprobe_simulate_nop),
/* PLD{W} (immediate) 1111 1000 10x1 xxxx 1111 xxxx xxxx xxxx */
DECODE_OR (0xffd0f000, 0xf890f000),
/* PLD{W} (immediate) 1111 1000 00x1 xxxx 1111 1100 xxxx xxxx */
DECODE_OR (0xffd0ff00, 0xf810fc00),
/* PLI (immediate) 1111 1001 1001 xxxx 1111 xxxx xxxx xxxx */
DECODE_OR (0xfff0f000, 0xf990f000),
/* PLI (immediate) 1111 1001 0001 xxxx 1111 1100 xxxx xxxx */
DECODE_SIMULATEX(0xfff0ff00, 0xf910fc00, kprobe_simulate_nop,
REGS(NOPCX, 0, 0, 0, 0)),
/* PLD{W} (register) 1111 1000 00x1 xxxx 1111 0000 00xx xxxx */
DECODE_OR (0xffd0ffc0, 0xf810f000),
/* PLI (register) 1111 1001 0001 xxxx 1111 0000 00xx xxxx */
DECODE_SIMULATEX(0xfff0ffc0, 0xf910f000, kprobe_simulate_nop,
REGS(NOPCX, 0, 0, 0, NOSPPC)),
/* Other unallocated instructions... */
DECODE_END
};
const union decode_item kprobe_decode_thumb32_table[] = {
/*
@ -539,6 +566,12 @@ const union decode_item kprobe_decode_thumb32_table[] = {
*/
DECODE_REJECT (0xff100000, 0xf9000000),
/*
* Memory hints
* 1111 100x x0x1 xxxx 1111 xxxx xxxx xxxx
*/
DECODE_TABLE (0xfe50f000, 0xf810f000, t32_table_1111_100x_x0x1__1111),
/*
* Coprocessor instructions
* 1111 11xx xxxx xxxx xxxx xxxx xxxx xxxx