Message-ID: <559A56D9.6070109@hitachi.com>
Date: Mon, 06 Jul 2015 19:22:17 +0900
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Organization: Hitachi, Ltd., Japan
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0
MIME-Version: 1.0
To: Pratyush Anand <panand@redhat.com>, linux-kernel@vger.kernel.org
CC: dave.long@linaro.org, will.deacon@arm.com
Subject: Re: Query: How to blacklist asm symbols for kprobe
References: <20150629091613.GA24236@dhcppc13.redhat.com>
In-Reply-To: <20150629091613.GA24236@dhcppc13.redhat.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1203
Lines: 35

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/