* Query: How to blacklist asm symbols for kprobe
@ 2015-06-29 9:16 Pratyush Anand
2015-07-03 10:07 ` Pratyush Anand
2015-07-06 10:22 ` Masami Hiramatsu
0 siblings, 2 replies; 3+ messages in thread
From: Pratyush Anand @ 2015-06-29 9:16 UTC (permalink / raw)
To: linux-kernel; +Cc: masami.hiramatsu.pt, dave.long, will.deacon
Hi,
There might be some symbols defined in asm file, which need to be
prevented for kprobe-ing.
For example, el0_sync, el1_sync, el0_dbg, el1_dbg etc (in
arch/arm64/kernel/entry.S) should be added to the kprobe blacklist
table. How can we do that?
~Pratyush
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Query: How to blacklist asm symbols for kprobe
2015-06-29 9:16 Query: How to blacklist asm symbols for kprobe Pratyush Anand
@ 2015-07-03 10:07 ` Pratyush Anand
2015-07-06 10:22 ` Masami Hiramatsu
1 sibling, 0 replies; 3+ messages in thread
From: Pratyush Anand @ 2015-07-03 10:07 UTC (permalink / raw)
To: linux-kernel; +Cc: masami.hiramatsu.pt, dave.long, will.deacon
On 29/06/2015:02:46:13 PM, Pratyush Anand wrote:
> Hi,
>
> There might be some symbols defined in asm file, which need to be
> prevented for kprobe-ing.
>
> For example, el0_sync, el1_sync, el0_dbg, el1_dbg etc (in
> arch/arm64/kernel/entry.S) should be added to the kprobe blacklist
> table. How can we do that?
I think, we need to define them under "section .entry.text" and then
to use arch_within_kprobe_blacklist to prevent such symbols from kprobing.
~Pratyush
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Query: How to blacklist asm symbols for kprobe
2015-06-29 9:16 Query: How to blacklist asm symbols for kprobe Pratyush Anand
2015-07-03 10:07 ` Pratyush Anand
@ 2015-07-06 10:22 ` Masami Hiramatsu
1 sibling, 0 replies; 3+ messages in thread
From: Masami Hiramatsu @ 2015-07-06 10:22 UTC (permalink / raw)
To: Pratyush Anand, linux-kernel; +Cc: dave.long, will.deacon
On 2015/06/29 18:16, Pratyush Anand wrote:
> Hi,
>
> There might be some symbols defined in asm file, which need to be
> prevented for kprobe-ing.
>
> For example, el0_sync, el1_sync, el0_dbg, el1_dbg etc (in
> arch/arm64/kernel/entry.S) should be added to the kprobe blacklist
> table. How can we do that?
>
You can port and use _ASM_NOKPROBE(symbol) macro in .S file.
In arch/x86/include/asm/asm.h, it is defined as below.
# define _ASM_NOKPROBE(entry) \
.pushsection "_kprobe_blacklist","aw" ; \
_ASM_ALIGN ; \
_ASM_PTR (entry); \
.popsection
Thank you,
--
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-06-29 9:16 Query: How to blacklist asm symbols for kprobe Pratyush Anand
2015-07-03 10:07 ` Pratyush Anand
2015-07-06 10:22 ` Masami Hiramatsu
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