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