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Wed, 29 Sep 2021 21:52:19 +0000 From: Nick Alcock To: jeyu@kernel.org, masahiroy@kernel.org Cc: linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de, eugene.loh@oracle.com, kris.van.hees@oracle.com Subject: [PATCH v5 3/7] kbuild: generate an address ranges map at vmlinux link time Date: Wed, 29 Sep 2021 22:51:50 +0100 Message-Id: <20210929215154.300692-4-nick.alcock@oracle.com> X-Mailer: git-send-email 2.33.0.256.gb827f06fa9 In-Reply-To: <20210929215154.300692-1-nick.alcock@oracle.com> References: <20210929215154.300692-1-nick.alcock@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: LO2P265CA0414.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a0::18) To SA2PR10MB4715.namprd10.prod.outlook.com (2603:10b6:806:fb::10) MIME-Version: 1.0 Received: from loom.srvr.nix (2001:8b0:1101:10::2) by LO2P265CA0414.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a0::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4566.13 via Frontend Transport; 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Signed-off-by: Nick Alcock --- scripts/link-vmlinux.sh | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index d74cee5c4326..a30075c14a25 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -196,7 +196,7 @@ vmlinux_link() ${ld} ${ldflags} -o ${output} \ ${wl}--whole-archive ${objs} ${wl}--no-whole-archive \ ${wl}--start-group ${libs} ${wl}--end-group \ - $@ ${ldlibs} + -Map=.tmp_vmlinux.map $@ ${ldlibs} } # generate .BTF typeinfo from DWARF debuginfo @@ -248,6 +248,19 @@ kallsyms() { local kallsymopt; + # read the linker map to identify ranges of addresses: + # - for each *.o file, report address, size, pathname + # - most such lines will have four fields + # - but sometimes there is a line break after the first field + # - start reading at "Linker script and memory map" + # - stop reading at ".brk" + ${AWK} ' + /\.o$/ && start==1 { print $(NF-2), $(NF-1), $NF } + /^Linker script and memory map/ { start = 1 } + /^\.brk/ { exit(0) } + ' .tmp_vmlinux.map | sort > .tmp_vmlinux.ranges + + # get kallsyms options if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then kallsymopt="${kallsymopt} --all-symbols" fi -- 2.33.0.256.gb827f06fa9