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-rw-r--r--arch/arc/lib/relocate.c72
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 0000000..956aa14
--- /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;
+}