Commit cbffd505 authored by Anton Kolesov's avatar Anton Kolesov Committed by Thomas Petazzoni
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toolchain: Add config option for atomic intrinsics 



GCC has several builtin functions that implement atomic operations. Those
functions are architecture specific and may not be implemented by the
specific toolchain. In case of GCC for ARC those functions rely on
LLOCK/SCOND instructions which are optional in ARC CPU's. If ARC CPU doesn't
support those instructions but software tries to use them, then application
will be aborted with Illegal instruction exception. To avoid confusion user
should first specify that their CPU supports atomic extension, which will
allow selection of packages that use builtin atomic functions.

Signed-off-by: default avatarAnton Kolesov <Anton.Kolesov@synopsys.com>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent 21205fce

arch/Config.in.arc

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# Choise of atomic instructions presence

config BR2_ARC_ATOMIC_EXT

	bool "Atomic extension (LLOCK/SCOND instructions)"

	select BR2_TOOLCHAIN_HAS_ATOMIC_INTRINSICS



config BR2_ARCH

	default "arc"	if BR2_arcle

	default "arceb"	if BR2_arceb

package/Makefile.in

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@@ -102,6 +102,10 @@ ifeq ($(BR2_xtensa),y) 
TARGET_ABI += -mlongcalls -mtext-section-literals

endif



ifeq ($(BR2_arc)$(BR2_ARC_ATOMIC_EXT),yy)

TARGET_ABI += -matomic

endif



STAGING_SUBDIR = usr/$(GNU_TARGET_NAME)/sysroot

STAGING_DIR    = $(HOST_DIR)/$(STAGING_SUBDIR)

toolchain/toolchain-common.in

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@@ -44,6 +44,10 @@ config BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS 
config BR2_TOOLCHAIN_HAS_SSP

	bool



config BR2_TOOLCHAIN_HAS_ATOMIC_INTRINSICS

	bool

	default y if !BR2_arc



config BR2_ENABLE_LOCALE_PURGE

	bool "Purge unwanted locales"

	help