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: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -98,3 +98,6 @@ obj-$(CONFIG_TRACEPOINTS) += trace.o
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# vdso
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obj-y += vdso64/
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obj-$(CONFIG_COMPAT) += vdso32/
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chkbss := head.o head64.o als.o early_nobss.o
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include $(srctree)/arch/s390/scripts/Makefile.chkbss
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@ -8,3 +8,6 @@ obj-y += mem.o xor.o
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lib-$(CONFIG_SMP) += spinlock.o
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lib-$(CONFIG_KPROBES) += probes.o
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lib-$(CONFIG_UPROBES) += probes.o
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chkbss := mem.o
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include $(srctree)/arch/s390/scripts/Makefile.chkbss
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14
arch/s390/scripts/Makefile.chkbss
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14
arch/s390/scripts/Makefile.chkbss
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@ -0,0 +1,14 @@
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# SPDX-License-Identifier: GPL-2.0
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quiet_cmd_chkbss = CHKBSS $<
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define cmd_chkbss
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if ! $(OBJDUMP) -j .bss -w -h $< | awk 'END { if ($$3) exit 1 }'; then \
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echo "error: $< .bss section is not empty" >&2; exit 1; \
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fi; \
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touch $@;
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endef
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$(obj)/built-in.a: $(patsubst %, $(obj)/%.chkbss, $(chkbss))
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%.o.chkbss: %.o
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$(call cmd,chkbss)
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@ -54,3 +54,6 @@ obj-$(CONFIG_CRASH_DUMP) += sclp_sdias.o zcore.o
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hmcdrv-objs := hmcdrv_mod.o hmcdrv_dev.o hmcdrv_ftp.o hmcdrv_cache.o diag_ftp.o sclp_ftp.o
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obj-$(CONFIG_HMC_DRV) += hmcdrv.o
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chkbss := sclp_early_core.o
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include $(srctree)/arch/s390/scripts/Makefile.chkbss
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