From 7b821a5ae882cb0c70fd9d09ec9d5952985951dc Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Thu, 18 Feb 2016 08:22:17 +0000
Subject: [PATCH] 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 <abrodkin@synopsys.com>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Jo-Philipp Wich <jow@openwrt.org>
Cc: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 48739
---
 toolchain/gcc/common.mk       |  1 +
 toolchain/uClibc/common.mk    |  3 ++-
 toolchain/uClibc/config/archs | 10 ++++++++++
 3 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 toolchain/uClibc/config/archs

diff --git a/toolchain/gcc/common.mk b/toolchain/gcc/common.mk
index 2912f8f612..6ac5a46f2d 100644
--- a/toolchain/gcc/common.mk
+++ b/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=$(TOPDIR)/staging_dir/host \
diff --git a/toolchain/uClibc/common.mk b/toolchain/uClibc/common.mk
index ad6ff02421..2828156237 100644
--- a/toolchain/uClibc/common.mk
+++ b/toolchain/uClibc/common.mk
@@ -41,8 +41,9 @@ GEN_CONFIG=$(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 \
diff --git a/toolchain/uClibc/config/archs b/toolchain/uClibc/config/archs
new file mode 100644
index 0000000000..961628ed8c
--- /dev/null
+++ b/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