add lib/jscore:

import dutape js engine from https://github.com/svaarala/duktape

    4781b33420eba0f0dd4f9caa10dfc17622d3925e

    python tools/configure.py --source-directory src-input --output-directory src-lowmemory \
        --option-file config/examples/low_memory.yaml --architecture arm32 --compiler gcc

Signed-off-by: surenyi <surenyi82@163.com>

lib/gcc_stubs.c

@@ -10,6 +10,11 @@
 #undef errno
 extern int errno;
 
+int * __errno()
+{
+    return &errno;
+}
+
 /*
  * Environment variables.
  * A pointer to a list of environment variables and their values. For a minimal

lib/rules.mk

@@ -41,6 +41,12 @@ ifeq ($(TARGET_USE_WM8978), y)
 	lib_srcs += $(lib_dir)/wm8978.c
 endif
 
+ifeq ($(TARGET_USE_JS), y)
+	lib_srcs += $(lib_dir)/jscore/duktape.c \
+
+	TARGET_CFLAGS += -I$(lib_dir)/jscore
+endif
+
 ifeq ($(TARGET_USE_EFS), y)
 	lib_srcs += \
 		$(lib_dir)/efs/spiffs_cache.c \

targets/stm32f429-disc/js.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include "duktape.h"
+#include "cmd.h"
+
+static duk_ret_t native_print(duk_context *ctx)
+{
+    duk_push_string(ctx, " ");
+    duk_insert(ctx, 0);
+    duk_join(ctx, duk_get_top(ctx) - 1);
+    printf("%s\n", duk_safe_to_string(ctx, -1));
+    return 0;
+}
+
+static int do_jshello(cmd_tbl_t s, int argc, char *argv[])
+{
+    duk_context *ctx = duk_create_heap_default();
+
+    duk_push_c_function(ctx, native_print, DUK_VARARGS);
+    duk_put_global_string(ctx, "print");
+
+    duk_eval_string(ctx, "print('welcome to use duktape!')");
+    duk_destroy_heap(ctx);
+
+    return 0;
+}
+
+CON_CMD(jshello, "hello from js", NULL, do_jshello);
+

targets/stm32f429-disc/target.h

@@ -35,6 +35,8 @@
 #define TARGET_I2S_TX_DMA_BUFSIZ   (2048)
 #endif
 
+#define TARGET_HEAP_SIZE (81920)
+
 /* efs attributes */
 #define TARGET_EFS_CAPACITY       0x00100000
 #define TARGET_EFS_ADDRESS        0x08100000

targets/stm32f429-disc/target.mk

@@ -5,6 +5,7 @@ RAMSZ    := 192k
 TARGET_USE_USB := y
 TARGET_USE_WM8978 := y
 TARGET_USE_EFS := y
+TARGET_USE_JS  := y
 
 OOCD_INTERFACE := stlink-v2-1
 OOCD_TRANSPORT := hla_swd
@@ -23,6 +24,7 @@ stm32f429_srcs := \
 	$(target_dir)/stmpe811.c \
 	$(target_dir)/retarget.c \
 	$(target_dir)/cmds.c \
+	$(target_dir)/js.c \
 
 $(target)_objs := $(stm32f429_srcs:.c=.o)