1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2008-2011
4 * Graeme Russ, <graeme.russ@gmail.com>
5 *
6 * (C) Copyright 2002
7 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
8 *
9 * (C) Copyright 2002
10 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
11 *
12 * (C) Copyright 2002
13 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
14 * Marius Groeger <mgroeger@sysgo.de>
15 */
16
17 #include <common.h>
18 #include <log.h>
19 #include <relocate.h>
20 #include <asm/global_data.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 unsigned long long type = ELF64_R_TYPE(re_src->r_info);
59
60 if (type != R_X86_64_RELATIVE) {
61 printf("%s: unsupported relocation type 0x%llx "
62 "at %p, ", __func__, type, re_src);
63 printf("offset = 0x%llx\n", re_src->r_offset);
64 continue;
65 }
66
67 /* Get the location from the relocation entry */
68 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
69
70 /* Check that the location of the relocation is in .text */
71 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
72 offset_ptr_rom > last_offset) {
73 /* Switch to the in-RAM version */
74 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
75 gd->reloc_off);
76
77 /* Check that the target points into .text */
78 if (*offset_ptr_ram >= text_base &&
79 *offset_ptr_ram <= text_base + size) {
80 *offset_ptr_ram = gd->reloc_off +
81 re_src->r_addend;
82 } else {
83 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %lX\n",
84 re_src, (ulong)re_src->r_info,
85 (ulong)re_src->r_offset, offset_ptr_ram,
86 (ulong)*offset_ptr_ram, text_base + size);
87 }
88 } else {
89 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
90 (ulong)re_src->r_info, (ulong)re_src->r_offset,
91 last_offset);
92 }
93 last_offset = offset_ptr_rom;
94
95 } while (++re_src < re_end);
96 }
97 #else
do_elf_reloc_fixups32(unsigned int text_base,uintptr_t size,Elf32_Rel * re_src,Elf32_Rel * re_end)98 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
99 Elf32_Rel *re_src, Elf32_Rel *re_end)
100 {
101 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
102 Elf32_Addr *offset_ptr_ram;
103
104 do {
105 unsigned int type = ELF32_R_TYPE(re_src->r_info);
106
107 if (type != R_386_RELATIVE) {
108 printf("%s: unsupported relocation type 0x%x "
109 "at %p, ", __func__, type, re_src);
110 printf("offset = 0x%x\n", re_src->r_offset);
111 continue;
112 }
113
114 /* Get the location from the relocation entry */
115 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
116
117 /* Check that the location of the relocation is in .text */
118 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
119 offset_ptr_rom > last_offset) {
120
121 /* Switch to the in-RAM version */
122 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
123 gd->reloc_off);
124
125 /* Check that the target points into .text */
126 if (*offset_ptr_ram >= text_base &&
127 *offset_ptr_ram <= text_base + size) {
128 *offset_ptr_ram += gd->reloc_off;
129 } else {
130 debug(" %p: rom reloc %x, ram %p, value %x, limit %lX\n",
131 re_src, re_src->r_offset, offset_ptr_ram,
132 *offset_ptr_ram, text_base + size);
133 }
134 } else {
135 debug(" %p: rom reloc %x, last %p\n", re_src,
136 re_src->r_offset, last_offset);
137 }
138 last_offset = offset_ptr_rom;
139
140 } while (++re_src < re_end);
141 }
142 #endif
143
144 /*
145 * This function has more error checking than you might expect. Please see
146 * this commit message for more information:
147 * 62f7970a x86: Add error checking to x86 relocation code
148 */
do_elf_reloc_fixups(void)149 int do_elf_reloc_fixups(void)
150 {
151 void *re_src = (void *)(&__rel_dyn_start);
152 void *re_end = (void *)(&__rel_dyn_end);
153 uint text_base;
154
155 /* The size of the region of u-boot that runs out of RAM. */
156 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
157
158 if (gd->flags & GD_FLG_SKIP_RELOC)
159 return 0;
160 if (re_src == re_end)
161 panic("No relocation data");
162
163 #ifdef CONFIG_SYS_TEXT_BASE
164 text_base = CONFIG_SYS_TEXT_BASE;
165 #else
166 panic("No CONFIG_SYS_TEXT_BASE");
167 #endif
168 #if CONFIG_IS_ENABLED(X86_64)
169 do_elf_reloc_fixups64(text_base, size, re_src, re_end);
170 #else
171 do_elf_reloc_fixups32(text_base, size, re_src, re_end);
172 #endif
173
174 return 0;
175 }
176