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https://github.com/AsahiLinux/u-boot
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36ae5cd2a8
In case of little-endian ARC700 instructions (which may include target address) are encoded as middle-endian. That's why it's required to swap bytes after read and ten right before write back. But in case of big-endian ARC700 instructions are encoded as a plain big-endian. Thus no need for byte swapping. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Francois Bedard <fbedard@synopsys.com> Cc: Tom Rini <trini@ti.com> cc: Noam Camus <noamc@ezchip.com>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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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/sections.h>
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DECLARE_GLOBAL_DATA_PTR;
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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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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 *)CONFIG_SYS_TEXT_BASE &&
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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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/*
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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)&__text_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 .text */
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if (val >= CONFIG_SYS_TEXT_BASE && val <=
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(unsigned int)&__bss_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)&__text_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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} else {
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debug(" %p: rom reloc %x, ram %p, value %x, limit %x\n",
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re_src, re_src->r_offset, offset_ptr_ram,
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val, (unsigned int)&__bss_end);
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}
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} else {
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debug(" %p: rom reloc %x, last %p\n", re_src,
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re_src->r_offset, last_offset);
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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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