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 <inttypes.h> 19 #include <relocate.h> 20 #include <asm/u-boot-x86.h> 21 #include <asm/sections.h> 22 #include <elf.h> 23 24 DECLARE_GLOBAL_DATA_PTR; 25 26 int copy_uboot_to_ram(void) 27 { 28 size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start; 29 30 if (gd->flags & GD_FLG_SKIP_RELOC) 31 return 0; 32 memcpy((void *)gd->relocaddr, (void *)&__text_start, len); 33 34 return 0; 35 } 36 37 int clear_bss(void) 38 { 39 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 40 size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start; 41 42 if (gd->flags & GD_FLG_SKIP_RELOC) 43 return 0; 44 memset((void *)dst_addr, 0x00, len); 45 46 return 0; 47 } 48 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) 52 { 53 Elf64_Addr *offset_ptr_rom, *last_offset = NULL; 54 Elf64_Addr *offset_ptr_ram; 55 56 do { 57 /* Get the location from the relocation entry */ 58 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset; 59 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 + 65 gd->reloc_off); 66 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 + 71 re_src->r_addend; 72 } else { 73 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %" 74 PRIXPTR "\n", 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); 78 } 79 } else { 80 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src, 81 (ulong)re_src->r_info, (ulong)re_src->r_offset, 82 last_offset); 83 } 84 last_offset = offset_ptr_rom; 85 86 } while (++re_src < re_end); 87 } 88 #else 89 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size, 90 Elf32_Rel *re_src, Elf32_Rel *re_end) 91 { 92 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 93 Elf32_Addr *offset_ptr_ram; 94 95 do { 96 /* Get the location from the relocation entry */ 97 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset; 98 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) { 102 103 /* Switch to the in-RAM version */ 104 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 105 gd->reloc_off); 106 107 /* 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; 111 } else { 112 debug(" %p: rom reloc %x, ram %p, value %x," 113 " limit %" PRIXPTR "\n", re_src, 114 re_src->r_offset, offset_ptr_ram, 115 *offset_ptr_ram, 116 text_base + size); 117 } 118 } else { 119 debug(" %p: rom reloc %x, last %p\n", re_src, 120 re_src->r_offset, last_offset); 121 } 122 last_offset = offset_ptr_rom; 123 124 } while (++re_src < re_end); 125 } 126 #endif 127 128 /* 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 132 */ 133 int do_elf_reloc_fixups(void) 134 { 135 void *re_src = (void *)(&__rel_dyn_start); 136 void *re_end = (void *)(&__rel_dyn_end); 137 uint text_base; 138 139 /* 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; 141 142 if (gd->flags & GD_FLG_SKIP_RELOC) 143 return 0; 144 if (re_src == re_end) 145 panic("No relocation data"); 146 147 #ifdef CONFIG_SYS_TEXT_BASE 148 text_base = CONFIG_SYS_TEXT_BASE; 149 #else 150 panic("No CONFIG_SYS_TEXT_BASE"); 151 #endif 152 #if CONFIG_IS_ENABLED(X86_64) 153 do_elf_reloc_fixups64(text_base, size, re_src, re_end); 154 #else 155 do_elf_reloc_fixups32(text_base, size, re_src, re_end); 156 #endif 157 158 return 0; 159 } 160