From: Michel Thebeau <michel.theb...@windriver.com>
Allow recipes to specify sections to be stripped from the kernel output
using KERNEL_IMAGE_STRIP. For example:
KERNEL_IMAGE_STRIP = ".comment .unwanted"
The kernel output is stripped in place.
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 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: Michel Thebeau <michel.theb...@windriver.com>
---
meta/classes/kernel.bbclass | 30 ++++++++++++++++++++++++++++--
1 file changed, 28 insertions(+), 2 deletions(-)
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index af58887..4c2c9b9 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -88,7 +88,7 @@ do_compile_kernelmodules() {
bbnote "no modules to compile"
fi
}
-addtask compile_kernelmodules after do_compile before do_install
+addtask compile_kernelmodules after do_compile before do_strip
kernel_do_install() {
#
@@ -289,6 +289,32 @@ 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}" ]; then
+ if [[ "${KERNEL_IMAGETYPE}" != "vmlinux" ]]; then
+ bbwarn "image type will not be stripped (not
supported): ${KERNEL_IMAGETYPE}"
+ return
+ fi
+
+ cd ${B}
+ headers=`"$CROSS_COMPILE"readelf -S ${KERNEL_OUTPUT} | \
+ grep "^ \{1,\}\[[0-9 ]\{1,\}\] [^ ]" | \
+ sed "s/^ \{1,\}\[[0-9 ]\{1,\}\] //" | \
+ gawk '{print $1}'`
+
+ for str in ${KERNEL_IMAGE_STRIP}; do {
+ if [[ "$headers" != *"$str"* ]]; then
+ bbwarn "Section not found: $str";
+ fi
+
+ "$CROSS_COMPILE"strip -s -R $str ${KERNEL_OUTPUT}
+ }; done
+ fi;
+}
+do_strip[dirs] = "${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() {
@@ -302,7 +328,7 @@ 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
--
1.7.9.7
_______________________________________________
Openembedded-core mailing list
Openembedded-core@lists.openembedded.org
http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
