linux-kernel - Re: [RFC PATCH] kprobes: arm: enable OPTPROBES for arm 32

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Date:	Wed, 6 Aug 2014 21:40:40 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	Russell King <linux@....linux.org.uk>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Will Deacon <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Li Zefan <lizefan@...wei.com>, <davem@...emloft.net>,
	<linux-arm-kernel@...ts.infradead.org>, <peifeiyue@...wei.com>
Subject: Re: [RFC PATCH] kprobes: arm: enable OPTPROBES for arm 32

On 2014/8/6 21:36, Jon Medhurst (Tixy) wrote:
> On Wed, 2014-08-06 at 13:44 +0900, Masami Hiramatsu wrote:
>> (2014/08/05 16:28), Wang Nan wrote
> [...]
>>> +asm (
>>> +			".global optprobe_template_entry\n"
>>> +			"optprobe_template_entry:\n"
>>> +#ifndef CONFIG_THUMB
>>> +			"	sub	sp, sp, #80\n"
>>> +			"	stmia	sp, {r0 - r14} \n"
>>> +			"	add	r3, sp, #80\n"
>>> +			"	str	r3, [sp, #52]\n"
>>> +			"	mrs	r4, cpsr\n"
>>> +			"	str	r4, [sp, #64]\n"
>>> +			"	mov	r1, sp\n"
>>> +			"	ldr	r0, 1f\n"
>>> +			"	ldr	r2, 2f\n"
>>> +			"	blx	r2\n"
>>> +			"	ldr	r1, [sp, #64]\n"
>>> +			"	msr	cpsr_fs, r1\n"
>>> +			"	ldmia	sp, {r0 - r15}\n"
>>> +			".global optprobe_template_val\n"
>>> +			"optprobe_template_val:\n"
>>> +			"1:	nop\n"
>>> +			".global optprobe_template_call\n"
>>> +			"optprobe_template_call:\n"
>>> +			"2:	nop\n"
>>> +#else /* CONFIG_THUMB */
>>> +# error optprobe for thumb is not supported.
>>
>> Can we set CONFIG_THUMB=y without CONFIG_THUMB2_KERNEL ?
> 
> Yes, CONFIG_THUMB is for supporting userside Thumb code,
> CONFIG_THUMB2_KERNEL is for building the kernel for Thumb and the
> options are orthogonal. So I don't think kprobes code should be testing
> CONFIG_THUMB as it doesn't deal with userside.
> 

You are correct. This is my mistake.


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