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 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 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) 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 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 */ 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