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s390: introduce .boot.data section compile time validation

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Make sure that .boot.data sections of vmlinux and
arch/s390/compressed/vmlinux match before producing the compressed kernel
image. Symbols presence, order and sizes are cross-checked.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2018-04-10 14:24:40 +02:00 committed by Martin Schwidefsky
parent 6966d604e2
commit 251b72a440
2 changed files with 19 additions and 2 deletions
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1
arch/s390/boot/.gitignore vendored
View File

@ -1,2 +1,3 @@
image
bzImage
section_cmp.*

20
arch/s390/boot/Makefile
View File

@ -28,14 +28,30 @@ endif
CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
obj-y := head.o als.o startup.o mem_detect.o ebcdic.o sclp_early_core.o mem.o
targets := bzImage startup.a $(obj-y)
targets := bzImage startup.a section_cmp.boot.data $(obj-y)
subdir- := compressed
OBJECTS := $(addprefix $(obj)/,$(obj-y))
$(obj)/bzImage: $(obj)/compressed/vmlinux FORCE
quiet_cmd_section_cmp = SECTCMP $*
define cmd_section_cmp
s1=`$(OBJDUMP) -t -j "$*" "$<" | sort | \
sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
s2=`$(OBJDUMP) -t -j "$*" "$(word 2,$^)" | sort | \
sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
if [ "$$s1" != "$$s2" ]; then \
echo "error: section $* differs between $< and $(word 2,$^)" >&2; \
exit 1; \
fi; \
touch $@
endef
$(obj)/bzImage: $(obj)/compressed/vmlinux $(obj)/section_cmp.boot.data FORCE
$(call if_changed,objcopy)
$(obj)/section_cmp%: vmlinux $(obj)/compressed/vmlinux FORCE
$(call if_changed,section_cmp)
$(obj)/compressed/vmlinux: $(obj)/startup.a FORCE
$(Q)$(MAKE) $(build)=$(obj)/compressed $@