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
38 #ifndef CONFIG_EFI_APP
clear_bss(void)39 int clear_bss(void)
40 {
41 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
42 size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
43
44 if (gd->flags & GD_FLG_SKIP_RELOC)
45 return 0;
46 memset((void *)dst_addr, 0x00, len);
47
48 return 0;
49 }
50 #endif
51
52 #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)53 static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
54 Elf64_Rela *re_src, Elf64_Rela *re_end)
55 {
56 Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
57 Elf64_Addr *offset_ptr_ram;
58
59 do {
60 unsigned long long type = ELF64_R_TYPE(re_src->r_info);
61
62 if (type != R_X86_64_RELATIVE) {
63 printf("%s: unsupported relocation type 0x%llx "
64 "at %p, ", __func__, type, re_src);
65 printf("offset = 0x%llx\n", re_src->r_offset);
66 continue;
67 }
68
69 /* Get the location from the relocation entry */
70 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
71
72 /* Check that the location of the relocation is in .text */
73 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
74 offset_ptr_rom > last_offset) {
75 /* Switch to the in-RAM version */
76 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
77 gd->reloc_off);
78
79 /* Check that the target points into .text */
80 if (*offset_ptr_ram >= text_base &&
81 *offset_ptr_ram <= text_base + size) {
82 *offset_ptr_ram = gd->reloc_off +
83 re_src->r_addend;
84 } else {
85 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %lX\n",
86 re_src, (ulong)re_src->r_info,
87 (ulong)re_src->r_offset, offset_ptr_ram,
88 (ulong)*offset_ptr_ram, text_base + size);
89 }
90 } else {
91 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
92 (ulong)re_src->r_info, (ulong)re_src->r_offset,
93 last_offset);
94 }
95 last_offset = offset_ptr_rom;
96
97 } while (++re_src < re_end);
98 }
99 #else
do_elf_reloc_fixups32(unsigned int text_base,uintptr_t size,Elf32_Rel * re_src,Elf32_Rel * re_end)100 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
101 Elf32_Rel *re_src, Elf32_Rel *re_end)
102 {
103 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
104 Elf32_Addr *offset_ptr_ram;
105
106 do {
107 unsigned int type = ELF32_R_TYPE(re_src->r_info);
108
109 if (type != R_386_RELATIVE) {
110 printf("%s: unsupported relocation type 0x%x "
111 "at %p, ", __func__, type, re_src);
112 printf("offset = 0x%x\n", re_src->r_offset);
113 continue;
114 }
115
116 /* Get the location from the relocation entry */
117 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
118
119 /* Check that the location of the relocation is in .text */
120 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
121 offset_ptr_rom > last_offset) {
122
123 /* Switch to the in-RAM version */
124 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
125 gd->reloc_off);
126
127 /* Check that the target points into .text */
128 if (*offset_ptr_ram >= text_base &&
129 *offset_ptr_ram <= text_base + size) {
130 *offset_ptr_ram += gd->reloc_off;
131 } else {
132 debug(" %p: rom reloc %x, ram %p, value %x, limit %lX\n",
133 re_src, re_src->r_offset, offset_ptr_ram,
134 *offset_ptr_ram, text_base + size);
135 }
136 } else {
137 debug(" %p: rom reloc %x, last %p\n", re_src,
138 re_src->r_offset, last_offset);
139 }
140 last_offset = offset_ptr_rom;
141
142 } while (++re_src < re_end);
143 }
144 #endif
145
146 /*
147 * This function has more error checking than you might expect. Please see
148 * this commit message for more information:
149 * 62f7970a x86: Add error checking to x86 relocation code
150 */
do_elf_reloc_fixups(void)151 int do_elf_reloc_fixups(void)
152 {
153 void *re_src = (void *)(&__rel_dyn_start);
154 void *re_end = (void *)(&__rel_dyn_end);
155 uint text_base;
156
157 /* The size of the region of u-boot that runs out of RAM. */
158 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
159
160 if (gd->flags & GD_FLG_SKIP_RELOC)
161 return 0;
162 if (re_src == re_end)
163 panic("No relocation data");
164
165 #ifdef CONFIG_TEXT_BASE
166 text_base = CONFIG_TEXT_BASE;
167 #else
168 panic("No CONFIG_TEXT_BASE");
169 #endif
170 #if CONFIG_IS_ENABLED(X86_64)
171 do_elf_reloc_fixups64(text_base, size, re_src, re_end);
172 #else
173 do_elf_reloc_fixups32(text_base, size, re_src, re_end);
174 #endif
175
176 return 0;
177 }
178