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

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Date:	Wed, 06 Aug 2014 14:36:48 +0100
From:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Wang Nan <wangnan0@...wei.com>,
	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 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.

-- 
Tixy

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