linux-kernel - Re: [PATCH 06/10] ARM: ftrace: add Thumb-2 support

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Message-ID: <1268605815.2168.6.camel@e102109-lin.cambridge.arm.com>
Date:	Sun, 14 Mar 2010 22:30:15 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Rabin Vincent <rabin@....in>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Abhishek Sagar <sagar.abhishek@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 06/10] ARM: ftrace: add Thumb-2 support

On Sat, 2010-03-13 at 06:49 +0000, Rabin Vincent wrote:
>  - The problem with the "mov lr, pc", is that it does not set the lsb when
>    storing the pc in lr.  The called function returns with "bx lr", and the
>    mode changes to ARM.  The blx is to avoid this.

I'm not familiar with ftrace but why does the called function returns
using "bx lr". Is this generated by the compiler? I had the impression
that if we don't enable interworking, we wouldn't get this instruction
(but haven't tried this yet).

-- 
Catalin

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