ARC: toolchain: handle difference in macros for MWDT and ARC GNU

Create include/toolchain/mwdt.h to handle difference in
several macros for MWDT and ARC GNU toolchains.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>

include/toolchain.h

@@ -35,6 +35,8 @@
 
 #if defined(__XCC__)
 #include <toolchain/xcc.h>
+#elif defined(__CCAC__)
+#include <toolchain/mwdt.h>
 #elif defined(__GNUC__) || (defined(_LINKER) && defined(__GCC_LINKER_CMD__))
 #include <toolchain/gcc.h>
 #else

include/toolchain/mwdt.h

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2020 Synopsys.
+ * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_TOOLCHAIN_MWDT_H_
+#define ZEPHYR_INCLUDE_TOOLCHAIN_MWDT_H_
+
+#ifndef _LINKER
+#if defined(_ASMLANGUAGE)
+
+#include <toolchain/common.h>
+
+#define FUNC_CODE()
+#define FUNC_INSTR(a)
+
+.macro section_var_mwdt, section, symbol
+	.section .\&section\&.\&symbol, "aw"
+	symbol :
+.endm
+
+.macro section_func_mwdt, section, symbol
+	.section .\&section\&.\&symbol, "ax"
+	FUNC_CODE()
+	PERFOPT_ALIGN
+	symbol :
+	FUNC_INSTR(symbol)
+.endm
+
+.macro section_subsec_func_mwdt, section, subsection, symbol
+	.section .\&section\&.\&subsection, "ax"
+	PERFOPT_ALIGN
+	symbol :
+.endm
+
+#define SECTION_VAR(sect, sym) section_var_mwdt sect, sym
+#define SECTION_FUNC(sect, sym) section_func_mwdt sect, sym
+#define SECTION_SUBSEC_FUNC(sect, subsec, sym) \
+	section_subsec_func_mwdt sect, subsec, sym
+
+.macro glbl_text_mwdt, symbol
+	.globl symbol
+	.type symbol, @function
+.endm
+
+.macro glbl_data_mwdt, symbol
+	.globl symbol
+	.type symbol, @object
+.endm
+
+.macro weak_data_mwdt, symbol
+	.weak symbol
+	.type symbol, @object
+.endm
+
+#define GTEXT(sym) glbl_text_mwdt sym
+#define GDATA(sym) glbl_data_mwdt sym
+#define WDATA(sym) weak_data_mwdt sym
+
+#else /* defined(_ASMLANGUAGE) */
+
+#include <toolchain/gcc.h>
+
+/* Metaware toolchain has _Static_assert. However it not able to calculate
+ * conditional expression in build time for some realy complex cases. ARC GNU
+ * toolchain works fine in this cases, so it looks like MWDT bug. So, disable
+ * BUILD_ASSERT macro until we fix that issue in MWDT toolchain.
+ */
+#undef BUILD_ASSERT
+#define BUILD_ASSERT(EXPR, MSG...)
+
+#define __builtin_arc_nop()	_nop()
+
+#endif /* _ASMLANGUAGE */
+
+#endif /* !_LINKER */
+#endif /* ZEPHYR_INCLUDE_TOOLCHAIN_MWDT_H_ */