1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2008-2011
4 * Graeme Russ, <graeme.russ@gmail.com>
7 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
10 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
13 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
14 * Marius Groeger <mgroeger@sysgo.de>
20 #include <asm/u-boot-x86.h>
21 #include <asm/sections.h>
24 DECLARE_GLOBAL_DATA_PTR;
26 int copy_uboot_to_ram(void)
28 size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;
30 if (gd->flags & GD_FLG_SKIP_RELOC)
32 memcpy((void *)gd->relocaddr, (void *)&__text_start, len);
39 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
40 size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
42 if (gd->flags & GD_FLG_SKIP_RELOC)
44 memset((void *)dst_addr, 0x00, len);
49 #if CONFIG_IS_ENABLED(X86_64)
50 static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
51 Elf64_Rela *re_src, Elf64_Rela *re_end)
53 Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
54 Elf64_Addr *offset_ptr_ram;
57 /* Get the location from the relocation entry */
58 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
60 /* Check that the location of the relocation is in .text */
61 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
62 offset_ptr_rom > last_offset) {
63 /* Switch to the in-RAM version */
64 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
67 /* Check that the target points into .text */
68 if (*offset_ptr_ram >= text_base &&
69 *offset_ptr_ram <= text_base + size) {
70 *offset_ptr_ram = gd->reloc_off +
73 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %"
75 re_src, (ulong)re_src->r_info,
76 (ulong)re_src->r_offset, offset_ptr_ram,
77 (ulong)*offset_ptr_ram, text_base + size);
80 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
81 (ulong)re_src->r_info, (ulong)re_src->r_offset,
84 last_offset = offset_ptr_rom;
86 } while (++re_src < re_end);
89 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
90 Elf32_Rel *re_src, Elf32_Rel *re_end)
92 Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
93 Elf32_Addr *offset_ptr_ram;
96 /* Get the location from the relocation entry */
97 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
99 /* Check that the location of the relocation is in .text */
100 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
101 offset_ptr_rom > last_offset) {
103 /* Switch to the in-RAM version */
104 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
107 /* Check that the target points into .text */
108 if (*offset_ptr_ram >= text_base &&
109 *offset_ptr_ram <= text_base + size) {
110 *offset_ptr_ram += gd->reloc_off;
112 debug(" %p: rom reloc %x, ram %p, value %x,"
113 " limit %" PRIXPTR "\n", re_src,
114 re_src->r_offset, offset_ptr_ram,
119 debug(" %p: rom reloc %x, last %p\n", re_src,
120 re_src->r_offset, last_offset);
122 last_offset = offset_ptr_rom;
124 } while (++re_src < re_end);
129 * This function has more error checking than you might expect. Please see
130 * this commit message for more information:
131 * 62f7970a x86: Add error checking to x86 relocation code
133 int do_elf_reloc_fixups(void)
135 void *re_src = (void *)(&__rel_dyn_start);
136 void *re_end = (void *)(&__rel_dyn_end);
139 /* The size of the region of u-boot that runs out of RAM. */
140 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
142 if (gd->flags & GD_FLG_SKIP_RELOC)
144 if (re_src == re_end)
145 panic("No relocation data");
147 #ifdef CONFIG_SYS_TEXT_BASE
148 text_base = CONFIG_SYS_TEXT_BASE;
150 panic("No CONFIG_SYS_TEXT_BASE");
152 #if CONFIG_IS_ENABLED(X86_64)
153 do_elf_reloc_fixups64(text_base, size, re_src, re_end);
155 do_elf_reloc_fixups32(text_base, size, re_src, re_end);