linux-kernel - Re: [RFC 0/4] arm64: add livepatch support

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Message-ID: <5566B0EA.1020007@huawei.com>
Date:	Thu, 28 May 2015 14:08:42 +0800
From:	Li Bin <huawei.libin@...wei.com>
To:	Jiri Kosina <jkosina@...e.cz>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
CC:	<linaro-kernel@...ts.linaro.org>, <catalin.marinas@....com>,
	<sjenning@...hat.com>, <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, <rostedt@...dmis.org>,
	<vojtech@...e.cz>, <broonie@...nel.org>, <jpoimboe@...hat.com>,
	<masami.hiramatsu.pt@...achi.com>, <live-patching@...r.kernel.org>,
	<mingo@...nel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 0/4] arm64: add livepatch support

On 2015/4/24 17:27, Jiri Kosina wrote:
> On Fri, 24 Apr 2015, AKASHI Takahiro wrote:
> 
>> This patchset enables livepatch support on arm64.
>>
>> Livepatch was merged in v4.0, and allows replacying a function dynamically
>> based on ftrace framework, but it also requires -mfentry option of gcc.
>> Currently arm64 gcc doesn't support it, but by adding a helper function to
>> ftrace, we will be able to support livepatch on arch's which don't support
>> this option.
>>
>> I submit this patchset as RFC since I'm not quite sure that I'm doing
>> in the right way, or we should definitely support -fentry instead.
> 
> I don't have arm64 cross-compiler handy, could you please copy/paste how 
> does function prologue, generated by gcc -pg on arm64 look like?
> 

The function prologue on arm64 with gcc -pg look like as following:
func:
        stp     x29, x30, [sp, -48]!
        add     x29, sp, 0
        mov     x1, x30
        str     w0, [x29,28]
        mov     x0, x1
        bl      _mcount
	...
Thanks,
	Li Bin

> Thanks,
> 


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