/*
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* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <elf.h>
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#include <asm-generic/sections.h>
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extern ulong __image_copy_start;
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extern ulong __ivt_end;
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DECLARE_GLOBAL_DATA_PTR;
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int copy_uboot_to_ram(void)
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{
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size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
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memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
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return 0;
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}
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int clear_bss(void)
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{
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ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
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size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
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memset((void *)dst_addr, 0x00, len);
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return 0;
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}
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/*
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* Base functionality is taken from x86 version with added ARC-specifics
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*/
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int do_elf_reloc_fixups(void)
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{
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Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
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Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
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debug("Section .rela.dyn is located at %08x-%08x\n",
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(unsigned int)re_src, (unsigned int)re_end);
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Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
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Elf32_Addr *offset_ptr_ram;
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do {
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/* Get the location from the relocation entry */
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offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
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/* Check that the location of the relocation is in .text */
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if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
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offset_ptr_rom > last_offset) {
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unsigned int val;
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/* Switch to the in-RAM version */
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offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
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gd->reloc_off);
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debug("Patching value @ %08x (relocated to %08x)\n",
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(unsigned int)offset_ptr_rom,
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(unsigned int)offset_ptr_ram);
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/*
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* Use "memcpy" because target location might be
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* 16-bit aligned on ARC so we may need to read
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* byte-by-byte. On attempt to read entire word by
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* CPU throws an exception
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*/
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memcpy(&val, offset_ptr_ram, sizeof(int));
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#ifdef __LITTLE_ENDIAN__
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/* If location in ".text" section swap value */
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if ((unsigned int)offset_ptr_rom <
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(unsigned int)&__ivt_end)
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val = (val << 16) | (val >> 16);
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#endif
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/* Check that the target points into executable */
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if (val >= (unsigned int)&__image_copy_start && val <=
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(unsigned int)&__image_copy_end) {
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val += gd->reloc_off;
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#ifdef __LITTLE_ENDIAN__
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/* If location in ".text" section swap value */
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if ((unsigned int)offset_ptr_rom <
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(unsigned int)&__ivt_end)
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val = (val << 16) | (val >> 16);
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#endif
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memcpy(offset_ptr_ram, &val, sizeof(int));
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}
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}
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last_offset = offset_ptr_rom;
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} while (++re_src < re_end);
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return 0;
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}
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