relocate.c
4.21 KB
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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/*
* (C) Copyright 2008-2011
* Graeme Russ, <graeme.russ@gmail.com>
*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <inttypes.h>
#include <relocate.h>
#include <asm/u-boot-x86.h>
#include <asm/sections.h>
#include <elf.h>
DECLARE_GLOBAL_DATA_PTR;
int copy_uboot_to_ram(void)
{
size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
memcpy((void *)gd->relocaddr, (void *)&__text_start, len);
return 0;
}
int clear_bss(void)
{
ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
memset((void *)dst_addr, 0x00, len);
return 0;
}
#if CONFIG_IS_ENABLED(X86_64)
static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
Elf64_Rela *re_src, Elf64_Rela *re_end)
{
Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
Elf64_Addr *offset_ptr_ram;
do {
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
offset_ptr_rom > last_offset) {
/* Switch to the in-RAM version */
offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
gd->reloc_off);
/* Check that the target points into .text */
if (*offset_ptr_ram >= text_base &&
*offset_ptr_ram <= text_base + size) {
*offset_ptr_ram = gd->reloc_off +
re_src->r_addend;
} else {
debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %"
PRIXPTR "\n",
re_src, (ulong)re_src->r_info,
(ulong)re_src->r_offset, offset_ptr_ram,
(ulong)*offset_ptr_ram, text_base + size);
}
} else {
debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
(ulong)re_src->r_info, (ulong)re_src->r_offset,
last_offset);
}
last_offset = offset_ptr_rom;
} while (++re_src < re_end);
}
#else
static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
Elf32_Rel *re_src, Elf32_Rel *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 *)(uintptr_t)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
offset_ptr_rom > last_offset) {
/* Switch to the in-RAM version */
offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
gd->reloc_off);
/* Check that the target points into .text */
if (*offset_ptr_ram >= text_base &&
*offset_ptr_ram <= text_base + size) {
*offset_ptr_ram += gd->reloc_off;
} else {
debug(" %p: rom reloc %x, ram %p, value %x,"
" limit %" PRIXPTR "\n", re_src,
re_src->r_offset, offset_ptr_ram,
*offset_ptr_ram,
text_base + size);
}
} else {
debug(" %p: rom reloc %x, last %p\n", re_src,
re_src->r_offset, last_offset);
}
last_offset = offset_ptr_rom;
} while (++re_src < re_end);
}
#endif
/*
* This function has more error checking than you might expect. Please see
* this commit message for more information:
* 62f7970a x86: Add error checking to x86 relocation code
*/
int do_elf_reloc_fixups(void)
{
void *re_src = (void *)(&__rel_dyn_start);
void *re_end = (void *)(&__rel_dyn_end);
uint text_base;
/* The size of the region of u-boot that runs out of RAM. */
uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
if (gd->flags & GD_FLG_SKIP_RELOC)
return 0;
if (re_src == re_end)
panic("No relocation data");
#ifdef CONFIG_SYS_TEXT_BASE
text_base = CONFIG_SYS_TEXT_BASE;
#else
panic("No CONFIG_SYS_TEXT_BASE");
#endif
#if CONFIG_IS_ENABLED(X86_64)
do_elf_reloc_fixups64(text_base, size, re_src, re_end);
#else
do_elf_reloc_fixups32(text_base, size, re_src, re_end);
#endif
return 0;
}