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authorVasily Gorbik <gor@linux.ibm.com>2018-04-10 14:24:40 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-10-09 11:21:08 +0200
commit251b72a440fa8c550d64d9a9f35e6e1b5b9637df (patch)
tree08c23cf6db97cf7b0c5cd342359bbbc5f5de17b7 /arch/s390/boot
parent6966d604e2ec4ecf5691aea953538f63597a250d (diff)
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: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/boot')
-rw-r--r--arch/s390/boot/.gitignore1
-rw-r--r--arch/s390/boot/Makefile20
2 files changed, 19 insertions, 2 deletions
diff --git a/arch/s390/boot/.gitignore b/arch/s390/boot/.gitignore
index 017d5912ad2d..16ff906e4610 100644
--- a/arch/s390/boot/.gitignore
+++ b/arch/s390/boot/.gitignore
@@ -1,2 +1,3 @@
image
bzImage
+section_cmp.*
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 5e2cec6e4b3e..b6903c47e0ac 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -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 $@