From 78186445a45e2874193d5f6dc4f16b7f02880d7e Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Date: Mon, 6 Jun 2016 23:44:35 +0300
Subject: [PATCH] targets/arduino_101: Refactor to better support other Zephyr
 targets.

This adds support for ARM/Thumb2 (Cortex-M) architecture, tested with
BOARD=qemu_cortex_m3 (i.e. QEMU with Cortex-M emulation). Should also
ease porting to other architectures supported by Zephyr.

This uses method of passing external libraries and link options into a
Zephyr application using ALL_LIBS and LDFLAGS_zephyr make variables, as
suggested by the Zephyr developers:
https://gerrit.zephyrproject.org/r/#/c/2476/ , and makes sure to append
to them, instead of assigning, to not overwrite important target-specific
options set by the Zephyr core.

JerryScript-DCO-1.0-Signed-off-by: Paul Sokolovsky paul.sokolovsky@linaro.org
---
 targets/arduino_101/Makefile             |  5 +++++
 targets/arduino_101/Makefile.arduino_101 | 16 +++++++++++-----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/targets/arduino_101/Makefile b/targets/arduino_101/Makefile
index 4ce34c942..d4746afc6 100644
--- a/targets/arduino_101/Makefile
+++ b/targets/arduino_101/Makefile
@@ -51,6 +51,11 @@ KBUILD_VERBOSE = $(V)
 
 APP = main-zephyr.c
 
+ALL_LIBS += $(USER_LIBS)
+export ALL_LIBS
+LDFLAGS_zephyr += $(USER_LIB_INCLUDE_DIR)
+export LDFLAGS_zephyr
+
 include ${ZEPHYR_BASE}/Makefile.inc 
 
 .PHONY = showconfig
diff --git a/targets/arduino_101/Makefile.arduino_101 b/targets/arduino_101/Makefile.arduino_101
index 4cea7d18a..f3ac05208 100644
--- a/targets/arduino_101/Makefile.arduino_101
+++ b/targets/arduino_101/Makefile.arduino_101
@@ -61,13 +61,19 @@ EXT_CFLAGS += -ffunction-sections -fno-inline-functions
 
 ifeq ($(BOARD),qemu_x86)
 CONFIG_TOOLCHAIN_VARIANT = x86
+CPU = x86
 EXT_CFLAGS += -march=pentium
+EXT_CFLAGS += -mpreferred-stack-boundary=2 -mno-sse
+else ifeq ($(BOARD),qemu_cortex_m3)
+CONFIG_TOOLCHAIN_VARIANT = arm
+CPU = arm7-m
+EXT_CFLAGS += -march=armv7-m -mthumb -mcpu=cortex-m3 -mabi=aapcs
 else
 CONFIG_TOOLCHAIN_VARIANT = iamcu
+CPU = lakemont
 EXT_CFLAGS += -march=lakemont -mtune=lakemont -miamcu -msoft-float
-endif
-
 EXT_CFLAGS += -mpreferred-stack-boundary=2 -mno-sse
+endif
 
 EXT_CFLAGS += -Wall -Wno-format-zero-length -Wno-pointer-sign
 EXT_CFLAGS += -Werror=format -Werror=implicit-int -Wno-unused-but-set-variable
@@ -89,12 +95,12 @@ EXTERNAL_LIB = $(INTERM)/lib$(TYPE).external$(VARIETY)-entry.a
 ZEPHYR_BIN = $(OUTPUT)/zephyr/zephyr.strip
 
 PREFIX = $(TYPE)$(VARIETY)
-LIBS = $(TYPE).external$(VARIETY)-entry $(PREFIX).jerry-core $(PREFIX).jerry-libm.lib $(TOOLCHAIN_LIBS) c
+LIBS = $(TYPE).external$(VARIETY)-entry $(PREFIX).jerry-core $(PREFIX).jerry-libm.lib
 
 # TODO @sergioamr Change how we link the library to USER_LDFLAGS
 # https://gerrit.zephyrproject.org/r/#/c/2048/
 
-BUILD_CONFIG = O="$(OUTPUT)/zephyr" V=$(V) TOOLCHAIN_LIBS="$(LIBS)" LIB_INCLUDE_DIR="$(LIB_INCLUDE_DIR)"
+BUILD_CONFIG = O="$(OUTPUT)/zephyr" V=$(V) USER_LIBS="$(LIBS)" USER_LIB_INCLUDE_DIR="-L $(CURDIR)/$(OUTPUT)"
 
 .PHONY: all
 all: jerry zephyr
@@ -112,7 +118,7 @@ endif
 	 -DCMAKE_VERBOSE_MAKEFILE=$(V) \
 	 -DEXTERNAL_CMAKE_C_COMPILER=$(CC) \
 	 -DEXTERNAL_CMAKE_C_COMPILER_ID=GNU \
-	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=x86 \
+	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=$(CPU) \
 	 -DEXTERNAL_MEM_HEAP_SIZE_KB=$(JERRYHEAP) \
 	 -DEXTERNAL_COMPILE_FLAGS="$(EXT_CFLAGS)" \
 	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=lakemont \