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| author | Allen Martin <amartin@nvidia.com> | 2012-07-18 13:45:53 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-10-04 14:19:04 +0200 |
| commit | 0f20bb601f134540a3608a9da5a7b4155e477ece (patch) | |
| tree | 3b0c645dd387c8d0cd700f81293b7baf8cd8e397 /arch/arm/config.mk | |
| parent | 2051ff3450113f4eb6aad250a9a3fc8c4af149dc (diff) | |
| download | talos-obmc-uboot-0f20bb601f134540a3608a9da5a7b4155e477ece.tar.gz talos-obmc-uboot-0f20bb601f134540a3608a9da5a7b4155e477ece.zip | |
arm: work around assembler bug
Disable sibling call optimization based on binutils version. This is
to work around a bug in the assember in binutils versions < 2.22.
Branches to weak symbols can be incorrectly optimized in thumb mode to
a short branch (b.n instruction) that won't reach when the symbol gets
preempted.
http://sourceware.org/bugzilla/show_bug.cgi?id=12532
Signed-off-by: Allen Martin <amartin@nvidia.com>
Acked-by: Tom Rini <trini@ti.com>
Diffstat (limited to 'arch/arm/config.mk')
| -rw-r--r-- | arch/arm/config.mk | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/config.mk b/arch/arm/config.mk index 3f4453a234..24b9d7c802 100644 --- a/arch/arm/config.mk +++ b/arch/arm/config.mk @@ -87,3 +87,21 @@ endif ifndef CONFIG_NAND_SPL LDFLAGS_u-boot += -pie endif + +# +# FIXME: binutils versions < 2.22 have a bug in the assembler where +# branches to weak symbols can be incorrectly optimized in thumb mode +# to a short branch (b.n instruction) that won't reach when the symbol +# gets preempted +# +# http://sourceware.org/bugzilla/show_bug.cgi?id=12532 +# +ifeq ($(CONFIG_SYS_THUMB_BUILD),y) +ifeq ($(GAS_BUG_12532),) +export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \ + then echo y; else echo n; fi) +endif +ifeq ($(GAS_BUG_12532),y) +PLATFORM_RELFLAGS += -fno-optimize-sibling-calls +endif +endif |
