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Commit 0391fcb5 authored by Vasily Gorbik's avatar Vasily Gorbik Committed by Martin Schwidefsky
Browse files

s390: introduce compile time check for empty .bss section 



Introduce compile time check for files which should avoid using .bss
section, because of the following reasons:
- .bss section has not been zeroed yet,
- initrd has not been moved to a safe location and could be overlapping
with .bss section.

Reviewed-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 971a9ca6

arch/s390/kernel/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -98,3 +98,6 @@ obj-$(CONFIG_TRACEPOINTS) += trace.o 
# vdso

obj-y				+= vdso64/

obj-$(CONFIG_COMPAT)		+= vdso32/



chkbss := head.o head64.o als.o early_nobss.o

include $(srctree)/arch/s390/scripts/Makefile.chkbss

arch/s390/lib/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -8,3 +8,6 @@ obj-y += mem.o xor.o 
lib-$(CONFIG_SMP) += spinlock.o

lib-$(CONFIG_KPROBES) += probes.o

lib-$(CONFIG_UPROBES) += probes.o



chkbss := mem.o

include $(srctree)/arch/s390/scripts/Makefile.chkbss

arch/s390/scripts/Makefile.chkbss

0 → 100644
+14 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0



quiet_cmd_chkbss = CHKBSS  $<

define cmd_chkbss

	if ! $(OBJDUMP) -j .bss -w -h $< | awk 'END { if ($$3) exit 1 }'; then \

		echo "error: $< .bss section is not empty" >&2; exit 1; \

	fi; \

	touch $@;

endef



$(obj)/built-in.a: $(patsubst %, $(obj)/%.chkbss, $(chkbss))



%.o.chkbss: %.o

	$(call cmd,chkbss)

drivers/s390/char/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -54,3 +54,6 @@ obj-$(CONFIG_CRASH_DUMP) += sclp_sdias.o zcore.o 


hmcdrv-objs := hmcdrv_mod.o hmcdrv_dev.o hmcdrv_ftp.o hmcdrv_cache.o diag_ftp.o sclp_ftp.o

obj-$(CONFIG_HMC_DRV) += hmcdrv.o



chkbss := sclp_early_core.o

include $(srctree)/arch/s390/scripts/Makefile.chkbss