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 <relocate.h>
19 #include <asm/u-boot-x86.h>
20 #include <asm/sections.h>
21 #include <elf.h>
22
23 DECLARE_GLOBAL_DATA_PTR;
24
copy_uboot_to_ram(void)25 int copy_uboot_to_ram(void)
26 {
27 size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;
28
29 if (gd->flags & GD_FLG_SKIP_RELOC)
30 return 0;
31 memcpy((void *)gd->relocaddr, (void *)&__text_start, len);
32
33 return 0;
34 }
35
clear_bss(void)36 int clear_bss(void)
37 {
38 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
39 size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
40
41 if (gd->flags & GD_FLG_SKIP_RELOC)
42 return 0;
43 memset((void *)dst_addr, 0x00, len);
44
45 return 0;
46 }
47
48 #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)49 static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
50 Elf64_Rela *re_src, Elf64_Rela *re_end)
51 {
52 Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
53 Elf64_Addr *offset_ptr_ram;
54
55 do {
56 unsigned long long type = ELF64_R_TYPE(re_src->r_info);
57
58 if (type != R_X86_64_RELATIVE) {
59 printf("%s: unsupported relocation type 0x%llx "
60 "at %p, ", __func__, type, re_src);
61 printf("offset = 0x%llx\n", re_src->r_offset);
62 continue;
63 }
64
65 /* Get the location from the relocation entry */
66 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
67
68 /* Check that the location of the relocation is in .text */
69 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
70 offset_ptr_rom > last_offset) {
71 /* Switch to the in-RAM version */
72 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
73 gd->reloc_off);
74
75 /* Check that the target points into .text */
76 if (*offset_ptr_ram >= text_base &&
77 *offset_ptr_ram <= text_base + size) {
78 *offset_ptr_ram = gd->reloc_off +
79 re_src->r_addend;
80 } else {
81 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %lX\n",
82 re_src, (ulong)re_src->r_info,
83 (ulong)re_src->r_offset, offset_ptr_ram,
84 (ulong)*offset_ptr_ram, text_base + size);
85 }
86 } else {
87 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
88 (ulong)re_src->r_info, (ulong)re_src->r_offset,
89 last_offset);
90 }
91 last_offset = offset_ptr_rom;
92
93 } while (++re_src < re_end);
94 }
95 #else
do_elf_reloc_fixups32(unsigned int text_base,uintptr_t size,Elf32_Rel * re_src,Elf32_Rel * re_end)96 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
97 Elf32_Rel *re_src, Elf32_Rel *re_end)
98 {
99 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
100 Elf32_Addr *offset_ptr_ram;
101
102 do {
103 unsigned int type = ELF32_R_TYPE(re_src->r_info);
104
105 if (type != R_386_RELATIVE) {
106 printf("%s: unsupported relocation type 0x%x "
107 "at %p, ", __func__, type, re_src);
108 printf("offset = 0x%x\n", re_src->r_offset);
109 continue;
110 }
111
112 /* Get the location from the relocation entry */
113 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
114
115 /* Check that the location of the relocation is in .text */
116 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
117 offset_ptr_rom > last_offset) {
118
119 /* Switch to the in-RAM version */
120 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
121 gd->reloc_off);
122
123 /* Check that the target points into .text */
124 if (*offset_ptr_ram >= text_base &&
125 *offset_ptr_ram <= text_base + size) {
126 *offset_ptr_ram += gd->reloc_off;
127 } else {
128 debug(" %p: rom reloc %x, ram %p, value %x, limit %lX\n",
129 re_src, re_src->r_offset, offset_ptr_ram,
130 *offset_ptr_ram, text_base + size);
131 }
132 } else {
133 debug(" %p: rom reloc %x, last %p\n", re_src,
134 re_src->r_offset, last_offset);
135 }
136 last_offset = offset_ptr_rom;
137
138 } while (++re_src < re_end);
139 }
140 #endif
141
142 /*
143 * This function has more error checking than you might expect. Please see
144 * this commit message for more information:
145 * 62f7970a x86: Add error checking to x86 relocation code
146 */
do_elf_reloc_fixups(void)147 int do_elf_reloc_fixups(void)
148 {
149 void *re_src = (void *)(&__rel_dyn_start);
150 void *re_end = (void *)(&__rel_dyn_end);
151 uint text_base;
152
153 /* The size of the region of u-boot that runs out of RAM. */
154 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
155
156 if (gd->flags & GD_FLG_SKIP_RELOC)
157 return 0;
158 if (re_src == re_end)
159 panic("No relocation data");
160
161 #ifdef CONFIG_SYS_TEXT_BASE
162 text_base = CONFIG_SYS_TEXT_BASE;
163 #else
164 panic("No CONFIG_SYS_TEXT_BASE");
165 #endif
166 #if CONFIG_IS_ENABLED(X86_64)
167 do_elf_reloc_fixups64(text_base, size, re_src, re_end);
168 #else
169 do_elf_reloc_fixups32(text_base, size, re_src, re_end);
170 #endif
171
172 return 0;
173 }
174