Implement riscv support for interpreter (#505)

product-mini/platforms/zephyr/simple/src/wasm-app-riscv64/build.sh

@@ -0,0 +1,27 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+WAMR_DIR=${PWD}/../../..
+
+echo "Build wasm app .."
+/opt/wasi-sdk/bin/clang -O3 \
+        -z stack-size=128 -Wl,--initial-memory=65536 \
+        -Wl,--global-base=0 \
+        -o test.wasm main.c \
+        -Wl,--export=main -Wl,--export=__main_argc_argv \
+        -Wl,--export=__data_end -Wl,--export=__heap_base \
+        -Wl,--strip-all,--no-entry \
+        -Wl,--allow-undefined \
+        -nostdlib \
+
+echo "Build binarydump tool .."
+rm -fr build && mkdir build && cd build
+cmake ../../../../../../../test-tools/binarydump-tool
+make
+cd ..
+
+echo "Generate test_wasm.h .."
+./build/binarydump -o test_wasm.h -n wasm_test_file test.wasm
+cp -a test_wasm.h ../test_wasm_riscv64.h
+
+echo "Done"

product-mini/platforms/zephyr/simple/src/wasm-app-riscv64/main.c

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+    char *buf;
+
+    printf("Hello world!\n");
+
+    buf = malloc(16);
+    if (!buf) {
+        printf("malloc buf failed\n");
+        return -1;
+    }
+
+    printf("buf ptr: %p\n", buf);
+
+    snprintf(buf, 1024, "%s", "1234\n");
+    printf("buf: %s", buf);
+
+    free(buf);
+    return 0;
+}