toolchain: add support of ARCv2 architecture

This change adds support of ARC ISAv2 processors in
OpenWRT toolchain.

In general gcc for ARC may compile code for both ISA versions
simultaneously but libgcc will be built only for default
architecture that's why it's necessary to specify --with-cpu
on gcc configuration.

As for uClibc we need to use different configurations for
different ARC ISAs.

Signed-off-by: Alexey Brodkin <[email protected]>
Cc: Felix Fietkau <[email protected]>
Cc: Jo-Philipp Wich <[email protected]>
Cc: Jonas Gorski <[email protected]>

SVN-Revision: 48739

toolchain/gcc/common.mk

@@ -111,6 +111,7 @@ GCC_CONFIGURE:= \
 		$(call qstrip,$(CONFIG_EXTRA_GCC_CONFIG_OPTIONS)) \
 		$(if $(CONFIG_mips64)$(CONFIG_mips64el),--with-arch=mips64 \
 			--with-abi=$(call qstrip,$(CONFIG_MIPS64_ABI))) \
+		$(if $(CONFIG_arc),--with-cpu=$(CONFIG_CPU_TYPE)) \
 		--with-gmp=$(TOPDIR)/staging_dir/host \
 		--with-mpfr=$(TOPDIR)/staging_dir/host \
 		--with-mpc=$(TOPDIR)/staging_dir/host \

toolchain/uClibc/common.mk

@@ -41,8 +41,9 @@ GEN_CONFIG=$(SCRIPT_DIR)/kconfig.pl -n \
 	$(if $(CONFIG_UCLIBC_ENABLE_DEBUG),$(if $(wildcard $(CONFIG_DIR)/debug),'+' $(CONFIG_DIR)/debug)) \
 	$(CONFIG_DIR)/$(ARCH)$(strip \
 		$(if $(wildcard $(CONFIG_DIR)/$(ARCH).$(BOARD)),.$(BOARD), \
+			$(if $(filter archs,$(subst ",,$(CONFIG_CPU_TYPE))),hs, \
 			$(if $(CONFIG_MIPS64_ABI),.$(subst ",,$(CONFIG_MIPS64_ABI)), \
-			$(if $(CONFIG_HAS_SPE_FPU),$(if $(wildcard $(CONFIG_DIR)/$(ARCH).e500),.e500)))))
+			$(if $(CONFIG_HAS_SPE_FPU),$(if $(wildcard $(CONFIG_DIR)/$(ARCH).e500),.e500))))))
 
 CPU_CFLAGS = \
 	-funsigned-char -fno-builtin -fno-asm \

toolchain/uClibc/config/archs

@@ -0,0 +1,10 @@
+ARCH_ANY_ENDIAN=y
+ARCH_LITTLE_ENDIAN=y
+ARCH_WANTS_LITTLE_ENDIAN=y
+TARGET_ARCH="arc"
+TARGET_arc=y
+# CONFIG_ARC_CPU_700 is not set
+CONFIG_ARC_CPU_HS=y
+CONFIG_ARC_PAGE_SIZE_8K=y
+# CONFIG_ARC_PAGE_SIZE_16K is not set
+# CONFIG_ARC_PAGE_SIZE_4K is not set