From: Michel Thebeau <michel.theb...@windriver.com>
Allow recipes to specify sections to be stripped from the kernel output
using KERNEL_IMAGE_STRIP_EXTRA_SECTIONS. For example:
KERNEL_IMAGE_STRIP_EXTRA_SECTIONS = ".comment .unwanted"
The file to be stripped is a copy of ${KERNEL_OUTPUT} and will be given
the same name with an additional ".stripped" suffix. The suffix can be
overridden using KERNEL_STRIP_SUFFIX.
Since the toolchain does not give indication when the specified sections
are absent, we read the sections first and make this report by issuing a
warning to the developer.
The toolchain by default strips the image with the -s option (even
when -s is not specified):
-s --strip-all Remove all symbol and relocation information
For example, these sections are always removed:
.debug_aranges
.debug_info
.debug_abbrev
.debug_line
.debug_frame
.debug_str
.debug_loc
.debug_ranges
.symtab
.strtab
In addition to these, the sections listed in
KERNEL_IMAGE_STRIP_EXTRA_SECTIONS will also be removed.
Only stripping of vmlinux (elf) is supported at this time. A warning
will be given if the image type is not vmlinux.
Stripping the image could also be done in the kernel, but that would
only work for linux-yocto based kernels, so it's not the route we
decided to go.
[YOCTO 3515]
Signed-off-by: Bruce Ashfield <bruce.ashfi...@windriver.com>
Signed-off-by: Michel Thebeau <michel.theb...@windriver.com>
---
meta/classes/kernel.bbclass | 65 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 63 insertions(+), 2 deletions(-)
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index af58887..60da4e2 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -41,6 +41,10 @@ KERNEL_RELEASE ?= "${KERNEL_VERSION}"
KERNEL_OUTPUT ?= "arch/${ARCH}/boot/${KERNEL_IMAGETYPE}"
KERNEL_IMAGEDEST = "boot"
+# When we strip the output, it is here
+KERNEL_STRIPPED_SUFFIX ?= ".stripped"
+KERNEL_OUTPUT_STRIPPED ?= "${KERNEL_OUTPUT}${KERNEL_STRIPPED_SUFFIX}"
+
#
# configuration
#
@@ -109,6 +113,12 @@ kernel_do_install() {
install -d ${D}/${KERNEL_IMAGEDEST}
install -d ${D}/boot
install -m 0644 ${KERNEL_OUTPUT}
${D}/${KERNEL_IMAGEDEST}/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}
+
+ if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
+ install -m 0644 ${KERNEL_OUTPUT_STRIPPED} \
+
${D}/${KERNEL_IMAGEDEST}/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}${KERNEL_STRIPPED_SUFFIX}
+ fi;
+
install -m 0644 System.map ${D}/boot/System.map-${KERNEL_VERSION}
install -m 0644 .config ${D}/boot/config-${KERNEL_VERSION}
install -m 0644 vmlinux ${D}/boot/vmlinux-${KERNEL_VERSION}
@@ -153,6 +163,12 @@ kernel_do_install() {
cd "$pwd"
fi
install -m 0644 ${KERNEL_OUTPUT} $kerneldir/${KERNEL_IMAGETYPE}
+
+ if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
+ install -m 0644 ${KERNEL_OUTPUT_STRIPPED} \
+ $kerneldir/${KERNEL_IMAGETYPE}${KERNEL_STRIPPED_SUFFIX}
+ fi
+
install -m 0644 System.map $kerneldir/System.map-${KERNEL_VERSION}
#
@@ -289,12 +305,46 @@ python split_kernel_packages () {
do_split_packages(d, root='/lib/firmware', file_regex='^(.*)\.cis$',
output_pattern='kernel-firmware-%s', description='Firmware for %s',
recursive=True, extra_depends='')
}
+do_strip() {
+ if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
+ if [[ "${KERNEL_IMAGETYPE}" != "vmlinux" ]]; then
+ bbwarn "image type will not be stripped (not
supported): ${KERNEL_IMAGETYPE}"
+ return
+ fi
+
+ cd ${B}
+ cp ${KERNEL_OUTPUT} ${KERNEL_OUTPUT_STRIPPED}
+
+ headers=`"$CROSS_COMPILE"readelf -S ${KERNEL_OUTPUT_STRIPPED} |
\
+ grep "^ \{1,\}\[[0-9 ]\{1,\}\] [^ ]" | \
+ sed "s/^ \{1,\}\[[0-9 ]\{1,\}\] //" | \
+ gawk '{print $1}'`
+
+ for str in ${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}; do {
+ if [[ "$headers" != *"$str"* ]]; then
+ bbwarn "Section not found: $str";
+ fi
+
+ "$CROSS_COMPILE"strip -s -R $str
${KERNEL_OUTPUT_STRIPPED}
+ }; done
+ fi;
+}
+do_strip[dirs] = "${B}"
+
+addtask do_strip before do_sizecheck after do_kernel_link_vmlinux
+
# Support checking the kernel size since some kernels need to reside in
partitions
# with a fixed length or there is a limit in transferring the kernel to memory
do_sizecheck() {
+ if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
+ koutf=${KERNEL_OUTPUT_STRIPPED}
+ else
+ koutf=${KERNEL_OUTPUT}
+ fi
+
if [ ! -z "${KERNEL_IMAGE_MAXSIZE}" ]; then
cd ${B}
- size=`ls -lL ${KERNEL_OUTPUT} | awk '{ print $5}'`
+ size=`ls -lL $koutf | awk '{ print $5}'`
if [ $size -ge ${KERNEL_IMAGE_MAXSIZE} ]; then
die "This kernel (size=$size > ${KERNEL_IMAGE_MAXSIZE})
is too big for your device. Please reduce the size of the kernel by making more
of it modular."
fi
@@ -302,7 +352,7 @@ do_sizecheck() {
}
do_sizecheck[dirs] = "${B}"
-addtask sizecheck before do_install after do_kernel_link_vmlinux
+addtask sizecheck before do_install after do_strip
KERNEL_IMAGE_BASE_NAME ?=
"${KERNEL_IMAGETYPE}-${PE}-${PV}-${PR}-${MACHINE}-${DATETIME}"
# Don't include the DATETIME variable in the sstate package signatures
@@ -342,6 +392,10 @@ addtask uboot_mkimage before do_install after do_compile
kernel_do_deploy() {
install -m 0644 ${KERNEL_OUTPUT}
${DEPLOYDIR}/${KERNEL_IMAGE_BASE_NAME}.bin
+ if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
+ install -m 0644 ${KERNEL_OUTPUT_STRIPPED} \
+
${DEPLOYDIR}/${KERNEL_IMAGE_BASE_NAME}${KERNEL_STRIPPED_SUFFIX}.bin
+ fi
if [ ${MODULE_TARBALL_DEPLOY} = "1" ] && (grep -q -i -e
'^CONFIG_MODULES=y$' .config); then
tar -cvzf ${DEPLOYDIR}/${MODULE_TARBALL_BASE_NAME} -C ${D} lib
ln -sf ${MODULE_TARBALL_BASE_NAME}.bin
${MODULE_TARBALL_SYMLINK_NAME}
@@ -352,6 +406,13 @@ kernel_do_deploy() {
ln -sf ${KERNEL_IMAGE_BASE_NAME}.bin ${KERNEL_IMAGE_SYMLINK_NAME}.bin
ln -sf ${KERNEL_IMAGE_BASE_NAME}.bin ${KERNEL_IMAGETYPE}
+ if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
+ ln -sf ${KERNEL_IMAGE_BASE_NAME}${KERNEL_STRIPPED_SUFFIX}.bin \
+
${KERNEL_IMAGE_SYMLINK_NAME}${KERNEL_STRIPPED_SUFFIX}.bin
+ ln -sf ${KERNEL_IMAGE_BASE_NAME}${KERNEL_STRIPPED_SUFFIX}.bin \
+ ${KERNEL_IMAGETYPE}${KERNEL_STRIPPED_SUFFIX}
+ fi
+
cp ${COREBASE}/meta/files/deploydir_readme.txt
${DEPLOYDIR}/README_-_DO_NOT_DELETE_FILES_IN_THIS_DIRECTORY.txt
cd -
}
--
1.7.9.7
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