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Commit 251b72a4 authored by Vasily Gorbik's avatar Vasily Gorbik Committed by Martin Schwidefsky
Browse files

s390: introduce .boot.data section compile time validation 



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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6966d604

arch/s390/boot/.gitignore

+1 −0
Original line number Diff line number Diff line 
image

bzImage

section_cmp.*

arch/s390/boot/Makefile

+18 −2
Original line number Diff line number Diff line
@@ -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 $@