arc: fix the bug of _arc_in_user_mode

* add arc_utils.s to contain the arc util functions in assembly
* fix the bug in _arc_in_user_mode

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>

Author: Wayne Ren

arc/arc_util.s

@@ -0,0 +1,54 @@
+/* ------------------------------------------
+ * Copyright (c) 2017, Synopsys, Inc. All rights reserved.
+
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+
+ * 1) Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+
+ * 2) Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.
+
+ * 3) Neither the name of the Synopsys, Inc., nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+--------------------------------------------- */
+
+#define __ASSEMBLY__
+#include "arc.h"
+#include "arc_asm_common.h"
+
+	.file "arc_utils.s"
+
+	.text
+	.global _arc_in_user_mode
+	.align 4
+_arc_in_user_mode:
+	lr r0, [AUX_STATUS32]
+	bbit1 r0, 20, 1f
+	bset r1, r0, 20
+	bclr r1, r1, 31
+	kflag r1
+	lr r1, [AUX_STATUS32]
+	bbit0 r1, 20, 2f
+	kflag r0
+1:
+	j_s.d [blink]
+	mov r0, 0
+2:
+	j_s.d [blink]
+	mov r0, 1

inc/arc/arc.h

@@ -473,6 +473,11 @@ extern "C" {
 
 #ifndef __ASSEMBLY__
 /* add type definition and function declaration here */
+/**
+ * \brief check whether process is in user mode
+ * \retval 0 kernel mode, 1 user mode
+ */
+extern unsigned int _arc_in_user_mode(void);
 #endif	/* assembly */
 
 #ifdef __cplusplus

inc/arc/arc_builtin.h

@@ -292,34 +292,6 @@ Inline int32_t _arc_goto_main(int argc, char **argv) {
 	return (int32_t)__ret;
 }
 
-
-/**
- * \brief check whether process is in user mode
- * \retval 0 kernel mode, 1 user mode
- */
-Inline uint32_t _arc_in_user_mode(void)
-{
-	uint32_t __ret;
-	uint32_t __val = 0;
-
-	Asm(
-		"lr    %0,[0xa]\n"
-		"bbit1 %0,20,1f\n" 	/* STATUS32.US == 1 implies Kernel mode */
-		"bset  %1,%0,20\n"	/* set the US bit */
-		"bclr  %1,%0,31\n"	/* clear the IE bit (no preemption) */
-		"kflag %1\n"		/* attempt to set US to 1 and IE to 0 */
-		"lr    %1,[0xa]\n"
-		"bbit0 %1,20,2f\n"	/* STATUS32.US == 0 implies User mode */
-		"kflag %0\n"		/* Kernel mode, restore STATUS32.[US,IE] */
-		"1:\n"
-		"mov   %0,0\n"		/* return 0 (not in User mode) */
-		"2:\n"
-		"mov   %0,1\n"		/* return 1 (in User mode) */
-		: "=r"(__ret):"r"(__val));
-	return __ret;
-}
-
-
 #ifdef __cplusplus
 }
 #endif