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arm: prevent using movt/movw address loads 

The movt/movw instruction can be used to hardcode an
memory location in the instruction itself. The linker
starts complaining about this if the compiler decides
to do so: "relocation R_ARM_MOVW_ABS_NC against `a local
symbol' can not be used" and it is not support by U-boot
as well. Prevent their use by requiring word relocations.
This allows u-boot to be build at other optimalization
levels then -Os.

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
Cc: TigerLiu@viatech.com.cn
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jeroen Hofstee 2013-08-24 13:55:38 +02:00 committed by Albert ARIBAUD
parent ad31ff6a4f
commit 373d798394
1 changed files with 6 additions and 2 deletions
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8
arch/arm/config.mk
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@ -94,7 +94,11 @@ PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
endif
endif
# check that only R_ARM_RELATIVE relocations are generated
ifneq ($(CONFIG_SPL_BUILD),y)
ALL-y += checkarmreloc
# Check that only R_ARM_RELATIVE relocations are generated.
ALL-y += checkarmreloc
# The movt / movw can hardcode 16 bit parts of the addresses in the
# instruction. Relocation is not supported for that case, so disable
# such usage by requiring word relocations.
PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
endif