blob: 956aa1494e1649275044154c26b31de5c090ff17 [file] [log] [blame]
Alexey Brodkin22723822014-02-04 12:56:15 +04001/*
2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <elf.h>
9#include <asm/sections.h>
10
11DECLARE_GLOBAL_DATA_PTR;
12
13/*
14 * Base functionality is taken from x86 version with added ARC-specifics
15 */
16int do_elf_reloc_fixups(void)
17{
18 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
19 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
20
21 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
22 Elf32_Addr *offset_ptr_ram;
23
24 do {
25 /* Get the location from the relocation entry */
26 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
27
28 /* Check that the location of the relocation is in .text */
29 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE &&
30 offset_ptr_rom > last_offset) {
31 unsigned int val;
32 /* Switch to the in-RAM version */
33 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
34 gd->reloc_off);
35
36 /*
37 * Use "memcpy" because target location might be
38 * 16-bit aligned on ARC so we may need to read
39 * byte-by-byte. On attempt to read entire word by
40 * CPU throws an exception
41 */
42 memcpy(&val, offset_ptr_ram, sizeof(int));
43
44 /* If location in ".text" section swap value */
45 if ((unsigned int)offset_ptr_rom <
46 (unsigned int)&__text_end)
47 val = (val << 16) | (val >> 16);
48
49 /* Check that the target points into .text */
50 if (val >= CONFIG_SYS_TEXT_BASE && val <=
51 (unsigned int)&__bss_end) {
52 val += gd->reloc_off;
53 /* If location in ".text" section swap value */
54 if ((unsigned int)offset_ptr_rom <
55 (unsigned int)&__text_end)
56 val = (val << 16) | (val >> 16);
57 memcpy(offset_ptr_ram, &val, sizeof(int));
58 } else {
59 debug(" %p: rom reloc %x, ram %p, value %x, limit %x\n",
60 re_src, re_src->r_offset, offset_ptr_ram,
61 val, (unsigned int)&__bss_end);
62 }
63 } else {
64 debug(" %p: rom reloc %x, last %p\n", re_src,
65 re_src->r_offset, last_offset);
66 }
67 last_offset = offset_ptr_rom;
68
69 } while (++re_src < re_end);
70
71 return 0;
72}