lib: add tst_res_hexd for newlib

index 3f7123e3f633..1492ff5c41e8 100644
@@ -44,6 +44,14 @@ void tst_res_(const char *file, const int lineno, int ttype,
 #define tst_res(ttype, arg_fmt, ...) \
 	tst_res_(__FILE__, __LINE__, (ttype), (arg_fmt), ##__VA_ARGS__)
 
+void tst_resm_hexd_(const char *file, const int lineno, int ttype,
+	const void *buf, size_t size, const char *arg_fmt, ...)
+	__attribute__ ((format (printf, 6, 7)));
+
+#define tst_res_hexd(ttype, buf, size, arg_fmt, ...) \
+	tst_resm_hexd_(__FILE__, __LINE__, (ttype), (buf), (size), \
+			(arg_fmt), ##__VA_ARGS__)
+
 /*
  * Reports result and exits a test.
  */

new file mode 100644
index 000000000000..333ea56a93ad
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2016 Linux Test Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include "tst_test.h"
+
+static void do_test(void)
+{
+	char tmp[] = "Hello from tst_res_hexd";
+
+	tst_res_hexd(TPASS, tmp, sizeof(tmp), "%s%d", "dump", 1);
+}
+
+static struct tst_test test = {
+	.tid = "tst_res_hexd",
+	.test_all = do_test,
+};

index b388d0d2e516..261dec0fbba8 100644
@@ -500,29 +500,33 @@ void tst_resm_(const char *file, const int lineno, int ttype,
 		tst_res__(file, lineno, ttype, "%s", tmesg);
 }
 
+typedef void (*tst_res_func_t)(const char *file, const int lineno,
+		int ttype, const char *fmt, ...);
+
 void tst_resm_hexd_(const char *file, const int lineno, int ttype,
 	const void *buf, size_t size, const char *arg_fmt, ...)
 {
-	NO_NEWLIB_ASSERT(file, lineno);
-
-	pthread_mutex_lock(&tmutex);
-
 	char tmesg[USERMESG];
-
-	EXPAND_VAR_ARGS(tmesg, arg_fmt, USERMESG);
-
 	static const size_t symb_num	= 2; /* xx */
 	static const size_t size_max	= 16;
 	size_t offset = strlen(tmesg);
+	size_t i;
 	char *pmesg = tmesg;
+	tst_res_func_t res_func;
+
+	if (tst_test)
+		res_func = tst_res_;
+	else
+		res_func = tst_res__;
+
+	EXPAND_VAR_ARGS(tmesg, arg_fmt, USERMESG);
 
 	if (size > size_max || size == 0 ||
 		(offset + size * (symb_num + 1)) >= USERMESG)
-		tst_res__(file, lineno, ttype, "%s", tmesg);
+		res_func(file, lineno, ttype, "%s", tmesg);
 	else
 		pmesg += offset;
 
-	size_t i;
 	for (i = 0; i < size; ++i) {
 		/* add space before byte except first one */
 		if (pmesg != tmesg)

@@ -531,12 +535,10 @@ void tst_resm_hexd_(const char *file, const int lineno, int ttype,
 		sprintf(pmesg, "%02x", ((unsigned char *)buf)[i]);
 		pmesg += symb_num;
 		if ((i + 1) % size_max == 0 || i + 1 == size) {
-			tst_res__(file, lineno, ttype, "%s", tmesg);
+			res_func(file, lineno, ttype, "%s", tmesg);
 			pmesg = tmesg;
 		}
 	}
-
-	pthread_mutex_unlock(&tmutex);
 }
 
 void tst_brkm_(const char *file, const int lineno, int ttype,