blob: 2482bcdffcc33103e913a5dc8ee33e0923278b18 [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
Alexey Brodkin36ae5cd2014-02-18 15:10:58 +040044#ifdef __LITTLE_ENDIAN__
Alexey Brodkin22723822014-02-04 12:56:15 +040045 /* If location in ".text" section swap value */
46 if ((unsigned int)offset_ptr_rom <
47 (unsigned int)&__text_end)
48 val = (val << 16) | (val >> 16);
Alexey Brodkin36ae5cd2014-02-18 15:10:58 +040049#endif
Alexey Brodkin22723822014-02-04 12:56:15 +040050
51 /* Check that the target points into .text */
52 if (val >= CONFIG_SYS_TEXT_BASE && val <=
53 (unsigned int)&__bss_end) {
54 val += gd->reloc_off;
Alexey Brodkin36ae5cd2014-02-18 15:10:58 +040055#ifdef __LITTLE_ENDIAN__
Alexey Brodkin22723822014-02-04 12:56:15 +040056 /* If location in ".text" section swap value */
57 if ((unsigned int)offset_ptr_rom <
58 (unsigned int)&__text_end)
59 val = (val << 16) | (val >> 16);
Alexey Brodkin36ae5cd2014-02-18 15:10:58 +040060#endif
Alexey Brodkin22723822014-02-04 12:56:15 +040061 memcpy(offset_ptr_ram, &val, sizeof(int));
62 } else {
63 debug(" %p: rom reloc %x, ram %p, value %x, limit %x\n",
64 re_src, re_src->r_offset, offset_ptr_ram,
65 val, (unsigned int)&__bss_end);
66 }
67 } else {
68 debug(" %p: rom reloc %x, last %p\n", re_src,
69 re_src->r_offset, last_offset);
70 }
71 last_offset = offset_ptr_rom;
72
73 } while (++re_src < re_end);
74
75 return 0;
76}