ARC: linker: implement linker related definition for MWDT

Implement linker related definitions and macros for MWDT
toolchain.

Signed-off-by: Eugeniy Paltsev <[email protected]>

include/linker/linker-tool-mwdt.h

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2020, Synopsys, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief Metware toolchain linker defs
+ *
+ * This header file defines the necessary macros used by the linker script for
+ * use with the metware linker.
+ */
+
+#ifndef ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_MWDT_H_
+#define ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_MWDT_H_
+
+/*
+ * mwdt linker doesn't have the following directives
+ */
+#define ASSERT(x, y)
+#define SUBALIGN(x) ALIGN(x)
+
+#define LOG2CEIL(x) ((((x) <= 2048) ? 11 : (((x) <= 4096)?12:(((x) <= 8192) ? \
+	13 : (((x) <= 16384) ? 14 : (((x) <= 32768) ? 15:(((x) <= 65536) ? \
+	16 : (((x) <= 131072) ? 17 : (((x) <= 262144) ? 18:(((x) <= 524288) ? \
+	19 : (((x) <= 1048576) ? 20 : (((x) <= 2097152) ? \
+	21 : (((x) <= 4194304) ? 22 : (((x) <= 8388608) ? \
+	23 : (((x) <= 16777216) ? 24 : (((x) <= 33554432) ? \
+	25 : (((x) <= 67108864) ? 26 : (((x) <= 134217728) ? \
+	27 : (((x) <= 268435456) ? 28 : (((x) <= 536870912) ? \
+	29 : (((x) <= 1073741824) ? 30 : (((x) <= 2147483648) ? \
+	31 : 32))))))))))))))))))))))
+/*
+ * The GROUP_START() and GROUP_END() macros are used to define a group
+ * of sections located in one memory area, such as RAM, ROM, etc.
+ * The <where> parameter is the name of the memory area.
+ */
+#define GROUP_START(where)
+#define GROUP_END(where)
+
+/*
+ * The GROUP_LINK_IN() macro is located at the end of the section
+ * description and tells the linker that this section is located in
+ * the memory area specified by <where> argument.
+ */
+#define GROUP_LINK_IN(where) > where
+
+/*
+ * As GROUP_LINK_IN(), but takes a second argument indicating the
+ * memory region (e.g. "ROM") for the load address.  Used for
+ * initialized data sections that on XIP platforms must be copied at
+ * startup.
+ *
+ * And, because output directives in GNU ld are "sticky", this must
+ * also be used on the first section *after* such an initialized data
+ * section, specifying the same memory region (e.g. "RAM") for both
+ * vregion and lregion.
+ */
+#ifdef CONFIG_XIP
+#define GROUP_DATA_LINK_IN(vregion, lregion) > vregion AT > lregion
+#else
+#define GROUP_DATA_LINK_IN(vregion, lregion) > vregion
+#endif
+
+/*
+ * The GROUP_FOLLOWS_AT() macro is located at the end of the section
+ * and indicates that the section does not specify an address at which
+ * it is to be loaded, but that it follows a section which did specify
+ * such an address
+ */
+#define GROUP_FOLLOWS_AT(where) AT > where
+
+/*
+ * The SECTION_PROLOGUE() macro is used to define the beginning of a section.
+ * The <name> parameter is the name of the section, and the <option> parameter
+ * is to include any special options such as (NOLOAD). Page alignment has its
+ * own parameter since it needs abstraction across the different toolchains.
+ * If not required, the <options> and <align> parameters should be left blank.
+ */
+
+#define SECTION_PROLOGUE(name, options, align) name options align :
+
+/*
+ * As for SECTION_PROLOGUE(), except that this one must (!) be used
+ * for data sections which on XIP platforms will have differing
+ * virtual and load addresses (i.e. they'll be copied into RAM at
+ * program startup).  Such a section must (!) also use
+ * GROUP_LINK_IN_LMA to specify the correct output load address.
+ */
+#ifdef CONFIG_XIP
+#define SECTION_DATA_PROLOGUE(name, options, align) \
+	name options ALIGN_WITH_INPUT align :
+#else
+#define SECTION_DATA_PROLOGUE(name, options, align) name options align :
+#endif
+
+#define SORT_BY_NAME(x) SORT(x)
+
+#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_MWDT_H_ */

include/linker/linker-tool.h

@@ -18,6 +18,8 @@
 #if defined(_LINKER)
 #if defined(__GCC_LINKER_CMD__)
 #include <linker/linker-tool-gcc.h>
+#elif defined(__MWDT_LINKER_CMD__)
+#include <linker/linker-tool-mwdt.h>
 #else
 #error "Unknown toolchain"
 #endif