1 /* 2 * (C) Copyright 2008-2011 3 * Graeme Russ, <graeme.russ@gmail.com> 4 * 5 * (C) Copyright 2002 6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> 7 * 8 * (C) Copyright 2002 9 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> 10 * 11 * (C) Copyright 2002 12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 13 * Marius Groeger <mgroeger@sysgo.de> 14 * 15 * SPDX-License-Identifier: GPL-2.0+ 16 */ 17 18 #include <common.h> 19 #include <inttypes.h> 20 #include <asm/u-boot-x86.h> 21 #include <asm/relocate.h> 22 #include <asm/sections.h> 23 #include <elf.h> 24 25 DECLARE_GLOBAL_DATA_PTR; 26 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 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) 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 /* Get the location from the relocation entry */ 59 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset; 60 61 /* Check that the location of the relocation is in .text */ 62 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base && 63 offset_ptr_rom > last_offset) { 64 /* Switch to the in-RAM version */ 65 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom + 66 gd->reloc_off); 67 68 /* Check that the target points into .text */ 69 if (*offset_ptr_ram >= text_base && 70 *offset_ptr_ram <= text_base + size) { 71 *offset_ptr_ram = gd->reloc_off + 72 re_src->r_addend; 73 } else { 74 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %" 75 PRIXPTR "\n", 76 re_src, (ulong)re_src->r_info, 77 (ulong)re_src->r_offset, offset_ptr_ram, 78 (ulong)*offset_ptr_ram, text_base + size); 79 } 80 } else { 81 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src, 82 (ulong)re_src->r_info, (ulong)re_src->r_offset, 83 last_offset); 84 } 85 last_offset = offset_ptr_rom; 86 87 } while (++re_src < re_end); 88 } 89 #else 90 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size, 91 Elf32_Rel *re_src, Elf32_Rel *re_end) 92 { 93 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 94 Elf32_Addr *offset_ptr_ram; 95 96 do { 97 /* Get the location from the relocation entry */ 98 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset; 99 100 /* Check that the location of the relocation is in .text */ 101 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base && 102 offset_ptr_rom > last_offset) { 103 104 /* Switch to the in-RAM version */ 105 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 106 gd->reloc_off); 107 108 /* Check that the target points into .text */ 109 if (*offset_ptr_ram >= text_base && 110 *offset_ptr_ram <= text_base + size) { 111 *offset_ptr_ram += gd->reloc_off; 112 } else { 113 debug(" %p: rom reloc %x, ram %p, value %x," 114 " limit %" PRIXPTR "\n", re_src, 115 re_src->r_offset, offset_ptr_ram, 116 *offset_ptr_ram, 117 text_base + size); 118 } 119 } else { 120 debug(" %p: rom reloc %x, last %p\n", re_src, 121 re_src->r_offset, last_offset); 122 } 123 last_offset = offset_ptr_rom; 124 125 } while (++re_src < re_end); 126 } 127 #endif 128 129 /* 130 * This function has more error checking than you might expect. Please see 131 * this commit message for more information: 132 * 62f7970a x86: Add error checking to x86 relocation code 133 */ 134 int do_elf_reloc_fixups(void) 135 { 136 void *re_src = (void *)(&__rel_dyn_start); 137 void *re_end = (void *)(&__rel_dyn_end); 138 uint text_base; 139 140 /* The size of the region of u-boot that runs out of RAM. */ 141 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 142 143 if (gd->flags & GD_FLG_SKIP_RELOC) 144 return 0; 145 if (re_src == re_end) 146 panic("No relocation data"); 147 148 #ifdef CONFIG_SYS_TEXT_BASE 149 text_base = CONFIG_SYS_TEXT_BASE; 150 #else 151 panic("No CONFIG_SYS_TEXT_BASE"); 152 #endif 153 #if CONFIG_IS_ENABLED(X86_64) 154 do_elf_reloc_fixups64(text_base, size, re_src, re_end); 155 #else 156 do_elf_reloc_fixups32(text_base, size, re_src, re_end); 157 #endif 158 159 return 0; 160 } 161