1 /*
2 * (C) Copyright 2008-2011
3 * Graeme Russ, <graeme.russ@gmail.com>
4 *
5 * (C) Copyright 2002
6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
7 *
8 * (C) Copyright 2002
9 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
10 *
11 * (C) Copyright 2002
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Marius Groeger <mgroeger@sysgo.de>
14 *
15 * SPDX-License-Identifier: GPL-2.0+
16 */
17
18 #include <common.h>
19 #include <inttypes.h>
20 #include <relocate.h>
21 #include <asm/u-boot-x86.h>
22 #include <asm/sections.h>
23 #include <elf.h>
24
25 DECLARE_GLOBAL_DATA_PTR;
26
copy_uboot_to_ram(void)27 int copy_uboot_to_ram(void)
28 {
29 size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;
30
31 if (gd->flags & GD_FLG_SKIP_RELOC)
32 return 0;
33 memcpy((void *)gd->relocaddr, (void *)&__text_start, len);
34
35 return 0;
36 }
37
clear_bss(void)38 int clear_bss(void)
39 {
40 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
41 size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
42
43 if (gd->flags & GD_FLG_SKIP_RELOC)
44 return 0;
45 memset((void *)dst_addr, 0x00, len);
46
47 return 0;
48 }
49
50 #if CONFIG_IS_ENABLED(X86_64)
do_elf_reloc_fixups64(unsigned int text_base,uintptr_t size,Elf64_Rela * re_src,Elf64_Rela * re_end)51 static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
52 Elf64_Rela *re_src, Elf64_Rela *re_end)
53 {
54 Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
55 Elf64_Addr *offset_ptr_ram;
56
57 do {
58 /* Get the location from the relocation entry */
59 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
60
61 /* Check that the location of the relocation is in .text */
62 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
63 offset_ptr_rom > last_offset) {
64 /* Switch to the in-RAM version */
65 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
66 gd->reloc_off);
67
68 /* Check that the target points into .text */
69 if (*offset_ptr_ram >= text_base &&
70 *offset_ptr_ram <= text_base + size) {
71 *offset_ptr_ram = gd->reloc_off +
72 re_src->r_addend;
73 } else {
74 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %"
75 PRIXPTR "\n",
76 re_src, (ulong)re_src->r_info,
77 (ulong)re_src->r_offset, offset_ptr_ram,
78 (ulong)*offset_ptr_ram, text_base + size);
79 }
80 } else {
81 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
82 (ulong)re_src->r_info, (ulong)re_src->r_offset,
83 last_offset);
84 }
85 last_offset = offset_ptr_rom;
86
87 } while (++re_src < re_end);
88 }
89 #else
do_elf_reloc_fixups32(unsigned int text_base,uintptr_t size,Elf32_Rel * re_src,Elf32_Rel * re_end)90 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
91 Elf32_Rel *re_src, Elf32_Rel *re_end)
92 {
93 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
94 Elf32_Addr *offset_ptr_ram;
95
96 do {
97 /* Get the location from the relocation entry */
98 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
99
100 /* Check that the location of the relocation is in .text */
101 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
102 offset_ptr_rom > last_offset) {
103
104 /* Switch to the in-RAM version */
105 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
106 gd->reloc_off);
107
108 /* Check that the target points into .text */
109 if (*offset_ptr_ram >= text_base &&
110 *offset_ptr_ram <= text_base + size) {
111 *offset_ptr_ram += gd->reloc_off;
112 } else {
113 debug(" %p: rom reloc %x, ram %p, value %x,"
114 " limit %" PRIXPTR "\n", re_src,
115 re_src->r_offset, offset_ptr_ram,
116 *offset_ptr_ram,
117 text_base + size);
118 }
119 } else {
120 debug(" %p: rom reloc %x, last %p\n", re_src,
121 re_src->r_offset, last_offset);
122 }
123 last_offset = offset_ptr_rom;
124
125 } while (++re_src < re_end);
126 }
127 #endif
128
129 /*
130 * This function has more error checking than you might expect. Please see
131 * this commit message for more information:
132 * 62f7970a x86: Add error checking to x86 relocation code
133 */
do_elf_reloc_fixups(void)134 int do_elf_reloc_fixups(void)
135 {
136 void *re_src = (void *)(&__rel_dyn_start);
137 void *re_end = (void *)(&__rel_dyn_end);
138 uint text_base;
139
140 /* The size of the region of u-boot that runs out of RAM. */
141 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
142
143 if (gd->flags & GD_FLG_SKIP_RELOC)
144 return 0;
145 if (re_src == re_end)
146 panic("No relocation data");
147
148 #ifdef CONFIG_SYS_TEXT_BASE
149 text_base = CONFIG_SYS_TEXT_BASE;
150 #else
151 panic("No CONFIG_SYS_TEXT_BASE");
152 #endif
153 #if CONFIG_IS_ENABLED(X86_64)
154 do_elf_reloc_fixups64(text_base, size, re_src, re_end);
155 #else
156 do_elf_reloc_fixups32(text_base, size, re_src, re_end);
157 #endif
158
159 return 0;
160 }
161