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ARM: kprobes: Reject 16-bit Thumb SVC and UNDEFINED instructions

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SVC (SWI) instructions shouldn't occur in kernel code so we don't
need to be able to probe them.

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 16:25:47 +01:00 committed by Tixy
parent 5b94faf8d7
commit 444956677e
1 changed files with 8 additions and 0 deletions
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8
arch/arm/kernel/kprobes-thumb.c
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@ -464,6 +464,14 @@ const union decode_item kprobe_decode_thumb16_table[] = {
/* LDM 1100 1xxx xxxx xxxx */
DECODE_EMULATE (0xf000, 0xc000, t16_emulate_loregs_rwflags),
/*
* Conditional branch, and Supervisor Call
*/
/* Permanently UNDEFINED 1101 1110 xxxx xxxx */
/* SVC 1101 1111 xxxx xxxx */
DECODE_REJECT (0xfe00, 0xde00),
DECODE_END
};