linux-kernel - Re: [PATCH v7 3/7] ftrace: Add arm64 support to recordmcount

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140416133145.GC1001@arm.com>
Date:	Wed, 16 Apr 2014 14:31:45 +0100
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 v7 3/7] ftrace: Add arm64 support to recordmcount

On Sat, Mar 15, 2014 at 05:40:44AM +0000, AKASHI Takahiro wrote:
> Recordmcount utility under scripts is run, after compiling each object,
> to find out all the locations of calling _mcount() and put them into
> specific seciton named __mcount_loc.
> Then linker collects all such information into a table in the kernel image
> (between __start_mcount_loc and __stop_mcount_loc) for later use by ftrace.
> 
> This patch adds arm64 specific definitions to identify such locations.
> There are two types of implementation, C and Perl. On arm64, only C version
> is used to build the kernel now that CONFIG_HAVE_C_RECORDMCOUNT is on.
> But Perl version is also maintained.
> 
> This patch also contains a workaround just in case where a header file,
> elf.h, on host machine doesn't have definitions of EM_AARCH64 nor
> R_AARCH64_ABS64. Without them, compiling C version of recordmcount will
> fail.
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>

  Acked-by: Will Deacon <will.deacon@....com>

Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/