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kernel.bbclass: do_strip: allow recipes to strip the kernel 

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 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_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]

(From OE-Core rev: 5f6d33b05b4e7883f2728ca812cb5386d1e36989)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Michel Thebeau <michel.thebeau@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Michel Thebeau 2013-04-10 08:36:47 -04:00 committed by Richard Purdie
parent 4c02dd5f64
commit cd2f003b51
1 changed files with 31 additions and 2 deletions
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33
meta/classes/kernel.bbclass
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@ -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 +289,35 @@ 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 ${B}
headers=`"$CROSS_COMPILE"readelf -S ${KERNEL_OUTPUT} | \
grep "^ \{1,\}\[[0-9 ]\{1,\}\] [^ ]" | \
sed "s/^ \{1,\}\[[0-9 ]\{1,\}\] //" | \
gawk '{print $1}'`
for str in ${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}; do {
if [[ "$headers" != *"$str"* ]]; then
bbwarn "Section not found: $str";
fi
"$CROSS_COMPILE"strip -s -R $str ${KERNEL_OUTPUT}
}; done
bbnote "KERNEL_IMAGE_STRIP_EXTRA_SECTIONS is set, stripping sections:" \
"${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}"
fi;
}
do_strip[dirs] = "${B}"
addtask do_strip before do_sizecheck after do_kernel_link_vmlinux
# Support checking the kernel size since some kernels need to reside in partitions
# with a fixed length or there is a limit in transferring the kernel to memory
do_sizecheck() {
@ -302,7 +331,7 @@ do_sizecheck() {
}
do_sizecheck[dirs] = "${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