linux-kernel - Re: [PATCH v6 3/7] ftrace: Add arm64 support to recordmcount

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Date:	Thu, 13 Mar 2014 16:05:34 +0000
From:	Will Deacon <will.deacon@....com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"tim.bird@...ymobile.com" <tim.bird@...ymobile.com>,
	"gkulkarni@...iumnetworks.com" <gkulkarni@...iumnetworks.com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"arndb@...db.de" <arndb@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 3/7] ftrace: Add arm64 support to recordmcount

On Thu, Mar 13, 2014 at 02:57:58PM +0000, AKASHI Takahiro wrote:
> On 03/13/2014 09:38 PM, Will Deacon wrote:
> > On Thu, Mar 13, 2014 at 10:13:46AM +0000, AKASHI Takahiro wrote:
> >> diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> >> index 91280b8..397b6b8 100755
> >> --- a/scripts/recordmcount.pl
> >> +++ b/scripts/recordmcount.pl
> >> @@ -279,6 +279,11 @@ if ($arch eq "x86_64") {
> >>       $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_ARM_(CALL|PC24|THM_CALL)" .
> >>   			"\\s+(__gnu_mcount_nc|mcount)\$";
> >>
> >> +} elsif ($arch eq "arm64") {
> >> +    $alignment = 3;
> >> +    $section_type = '%progbits';
> >> +    $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_AARCH64_CALL26\\s+_mcount\$";
> >
> > What about "mcount" (i.e. no underscore)?
> 
> I don't think it works since such regex doesn't match to "CALL26   _mcount".

What I meant was, do you need to match "mcount" as well? However, after
speaking to our GCC guys, they say they only support "_mcount" (preferred)
and "__mcount" (which GCC itself doesn't emit) so you can leave this regex
as-is.

Will
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