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ARM: kprobes: Reject 16-bit Thumb SETEND, CPS and BKPT instructions

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These are very rare and/or problematic to emulate so we will take the
easy option and disallow probing them (as does the existing ARM
implementation).

Rejecting these instructions doesn't actually require any entries in the
decoding table as it is the default case for instructions which aren't
found.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst 2011-07-02 16:39:07 +01:00 committed by Tixy
parent 396b41f68d
commit 0a188ccb5e
1 changed files with 4 additions and 0 deletions
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4
arch/arm/kernel/kprobes-thumb.c
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@ -373,6 +373,10 @@ static const union decode_item t16_table_1011[] = {
/* IT 1011 1111 xxxx xxxx */
DECODE_CUSTOM (0xff00, 0xbf00, t16_decode_it),
/* SETEND 1011 0110 010x xxxx */
/* CPS 1011 0110 011x xxxx */
/* BKPT 1011 1110 xxxx xxxx */
/* And unallocated instructions... */
DECODE_END
};