1 files changed, 72 insertions, 0 deletions
diff --git a/arch/arc/lib/relocate.c b/arch/arc/lib/relocate.c
new file mode 100644
index 0000000000..956aa1494e
--- /dev/null
+++ b/arch/arc/lib/relocate.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <elf.h>
+#include <asm/sections.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Base functionality is taken from x86 version with added ARC-specifics
+ */
+int do_elf_reloc_fixups(void)
+{
+	Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
+	Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
+
+	Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
+	Elf32_Addr *offset_ptr_ram;
+
+	do {
+		/* Get the location from the relocation entry */
+		offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
+
+		/* Check that the location of the relocation is in .text */
+		if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE &&
+		    offset_ptr_rom > last_offset) {
+			unsigned int val;
+			/* Switch to the in-RAM version */
+			offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
+							gd->reloc_off);
+
+			/*
+			 * Use "memcpy" because target location might be
+			 * 16-bit aligned on ARC so we may need to read
+			 * byte-by-byte. On attempt to read entire word by
+			 * CPU throws an exception
+			 */
+			memcpy(&val, offset_ptr_ram, sizeof(int));
+
+			/* If location in ".text" section swap value */
+			if ((unsigned int)offset_ptr_rom <
+			    (unsigned int)&__text_end)
+				val = (val << 16) | (val >> 16);
+
+			/* Check that the target points into .text */
+			if (val >= CONFIG_SYS_TEXT_BASE && val <=
+			    (unsigned int)&__bss_end) {
+				val += gd->reloc_off;
+				/* If location in ".text" section swap value */
+				if ((unsigned int)offset_ptr_rom <
+				    (unsigned int)&__text_end)
+					val = (val << 16) | (val >> 16);
+				memcpy(offset_ptr_ram, &val, sizeof(int));
+			} else {
+				debug("   %p: rom reloc %x, ram %p, value %x, limit %x\n",
+				      re_src, re_src->r_offset, offset_ptr_ram,
+				      val, (unsigned int)&__bss_end);
+			}
+		} else {
+			debug("   %p: rom reloc %x, last %p\n", re_src,
+			      re_src->r_offset, last_offset);
+		}
+		last_offset = offset_ptr_rom;
+
+	} while (++re_src < re_end);
+
+	return 0;
+}