1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <elf.h>
#include <asm-generic/sections.h>
extern ulong __image_copy_start;
extern ulong __ivt_end;
DECLARE_GLOBAL_DATA_PTR;
int copy_uboot_to_ram(void)
{
size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
return 0;
}
int clear_bss(void)
{
ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
memset((void *)dst_addr, 0x00, len);
return 0;
}
/*
* Base functionality is taken from x86 version with added ARC-specifics
*/
int do_elf_reloc_fixups(void)
{
Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
debug("Section .rela.dyn is located at %08x-%08x\n",
(unsigned int)re_src, (unsigned int)re_end);
Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
Elf32_Addr *offset_ptr_ram;
do {
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
offset_ptr_rom > last_offset) {
unsigned int val;
/* Switch to the in-RAM version */
offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
gd->reloc_off);
debug("Patching value @ %08x (relocated to %08x)\n",
(unsigned int)offset_ptr_rom,
(unsigned int)offset_ptr_ram);
/*
* Use "memcpy" because target location might be
* 16-bit aligned on ARC so we may need to read
* byte-by-byte. On attempt to read entire word by
* CPU throws an exception
*/
memcpy(&val, offset_ptr_ram, sizeof(int));
#ifdef __LITTLE_ENDIAN__
/* If location in ".text" section swap value */
if ((unsigned int)offset_ptr_rom <
(unsigned int)&__ivt_end)
val = (val << 16) | (val >> 16);
#endif
/* Check that the target points into executable */
if (val >= (unsigned int)&__image_copy_start && val <=
(unsigned int)&__image_copy_end) {
val += gd->reloc_off;
#ifdef __LITTLE_ENDIAN__
/* If location in ".text" section swap value */
if ((unsigned int)offset_ptr_rom <
(unsigned int)&__ivt_end)
val = (val << 16) | (val >> 16);
#endif
memcpy(offset_ptr_ram, &val, sizeof(int));
}
}
last_offset = offset_ptr_rom;
} while (++re_src < re_end);
return 0;
}
|
