From 0f20bb601f134540a3608a9da5a7b4155e477ece Mon Sep 17 00:00:00 2001 From: Allen Martin Date: Wed, 18 Jul 2012 13:45:53 +0000 Subject: 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 Acked-by: Tom Rini --- arch/arm/config.mk | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/arm/config.mk b/arch/arm/config.mk index 3f4453a23..24b9d7c80 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 -- cgit v1.2.3