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22723828 AB |
1 | /* |
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> | |
9bef24d0 AB |
9 | #include <asm-generic/sections.h> |
10 | ||
11 | extern ulong __image_copy_start; | |
12 | extern ulong __ivt_end; | |
22723828 AB |
13 | |
14 | DECLARE_GLOBAL_DATA_PTR; | |
15 | ||
3fb80163 AB |
16 | int copy_uboot_to_ram(void) |
17 | { | |
18 | size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start; | |
19 | ||
20 | memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len); | |
21 | ||
22 | return 0; | |
23 | } | |
24 | ||
25 | int clear_bss(void) | |
26 | { | |
27 | ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; | |
28 | size_t len = (size_t)&__bss_end - (size_t)&__bss_start; | |
29 | ||
30 | memset((void *)dst_addr, 0x00, len); | |
31 | ||
32 | return 0; | |
33 | } | |
34 | ||
22723828 AB |
35 | /* |
36 | * Base functionality is taken from x86 version with added ARC-specifics | |
37 | */ | |
38 | int do_elf_reloc_fixups(void) | |
39 | { | |
40 | Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start); | |
41 | Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end); | |
42 | ||
ffffcd15 AB |
43 | debug("Section .rela.dyn is located at %08x-%08x\n", |
44 | (unsigned int)re_src, (unsigned int)re_end); | |
45 | ||
22723828 AB |
46 | Elf32_Addr *offset_ptr_rom, *last_offset = NULL; |
47 | Elf32_Addr *offset_ptr_ram; | |
48 | ||
49 | do { | |
50 | /* Get the location from the relocation entry */ | |
51 | offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; | |
52 | ||
53 | /* Check that the location of the relocation is in .text */ | |
1c91a3d9 | 54 | if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start && |
22723828 AB |
55 | offset_ptr_rom > last_offset) { |
56 | unsigned int val; | |
57 | /* Switch to the in-RAM version */ | |
58 | offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + | |
59 | gd->reloc_off); | |
60 | ||
ffffcd15 AB |
61 | debug("Patching value @ %08x (relocated to %08x)\n", |
62 | (unsigned int)offset_ptr_rom, | |
63 | (unsigned int)offset_ptr_ram); | |
64 | ||
22723828 AB |
65 | /* |
66 | * Use "memcpy" because target location might be | |
67 | * 16-bit aligned on ARC so we may need to read | |
68 | * byte-by-byte. On attempt to read entire word by | |
69 | * CPU throws an exception | |
70 | */ | |
71 | memcpy(&val, offset_ptr_ram, sizeof(int)); | |
72 | ||
36ae5cd2 | 73 | #ifdef __LITTLE_ENDIAN__ |
22723828 AB |
74 | /* If location in ".text" section swap value */ |
75 | if ((unsigned int)offset_ptr_rom < | |
20a58ac0 | 76 | (unsigned int)&__ivt_end) |
22723828 | 77 | val = (val << 16) | (val >> 16); |
36ae5cd2 | 78 | #endif |
22723828 | 79 | |
1c91a3d9 AB |
80 | /* Check that the target points into executable */ |
81 | if (val >= (unsigned int)&__image_copy_start && val <= | |
82 | (unsigned int)&__image_copy_end) { | |
22723828 | 83 | val += gd->reloc_off; |
36ae5cd2 | 84 | #ifdef __LITTLE_ENDIAN__ |
22723828 AB |
85 | /* If location in ".text" section swap value */ |
86 | if ((unsigned int)offset_ptr_rom < | |
20a58ac0 | 87 | (unsigned int)&__ivt_end) |
22723828 | 88 | val = (val << 16) | (val >> 16); |
36ae5cd2 | 89 | #endif |
22723828 | 90 | memcpy(offset_ptr_ram, &val, sizeof(int)); |
22723828 | 91 | } |
22723828 AB |
92 | } |
93 | last_offset = offset_ptr_rom; | |
94 | ||
95 | } while (++re_src < re_end); | |
96 | ||
97 | return 0; | |
98 | } |