From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Wed, 16 Apr 2014 14:31:45 +0100 Subject: [PATCH v7 3/7] ftrace: Add arm64 support to recordmcount In-Reply-To: <1394862048-28758-4-git-send-email-takahiro.akashi@linaro.org> References: <1394705630-12384-1-git-send-email-takahiro.akashi@linaro.org> <1394862048-28758-1-git-send-email-takahiro.akashi@linaro.org> <1394862048-28758-4-git-send-email-takahiro.akashi@linaro.org> Message-ID: <20140416133145.GC1001@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Acked-by: Will Deacon Will