linux-kernel - Re: Anyone working on ftrace function graph support on ARM?

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Message-ID: <20090409152957.GA7236@caradoc.them.org>
Date:	Thu, 9 Apr 2009 11:29:57 -0400
From:	Daniel Jacobowitz <dan@...ian.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Tim Bird <tim.bird@...sony.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Abhishek Sagar <sagar.abhishek@...il.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: Anyone working on ftrace function graph support on ARM?

Sorry for the late reply, I'm way behind on list mail.

On Fri, Mar 27, 2009 at 12:58:08PM +0000, Catalin Marinas wrote:
> Anyway, the EABI toolchain I have (from CodeSourcery) generates
> something like below with -pg for both ARM and Thumb code (so that it
> doesn't rely on the frame pointer):
> 
> 	push	{lr}
> 	bl	__gnu_mcount_nc
> 
> I think this will be (was?) merged into the mainline gcc for ARM. The
> -pg option is still incompatible with -fomit-frame-pointer but maybe it
> shouldn't be anymore.

Was merged.  It'll be in GCC 4.4 and is in our current Lite releases;
it was created to solve precisely this problem.  It should be easy to
apply to an older GCC release if desired, but it's not in existing
FSF releases.

-- 
Daniel Jacobowitz
CodeSourcery
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