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 /* Get the location from the relocation entry */ 57 offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset; 58 59 /* Check that the location of the relocation is in .text */ 60 if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base && 61 offset_ptr_rom > last_offset) { 62 /* Switch to the in-RAM version */ 63 offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom + 64 gd->reloc_off); 65 66 /* Check that the target points into .text */ 67 if (*offset_ptr_ram >= text_base && 68 *offset_ptr_ram <= text_base + size) { 69 *offset_ptr_ram = gd->reloc_off + 70 re_src->r_addend; 71 } else { 72 debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %lX\n", 73 re_src, (ulong)re_src->r_info, 74 (ulong)re_src->r_offset, offset_ptr_ram, 75 (ulong)*offset_ptr_ram, text_base + size); 76 } 77 } else { 78 debug(" %p: %lx: rom reloc %lx, last %p\n", re_src, 79 (ulong)re_src->r_info, (ulong)re_src->r_offset, 80 last_offset); 81 } 82 last_offset = offset_ptr_rom; 83 84 } while (++re_src < re_end); 85 } 86 #else 87 static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size, 88 Elf32_Rel *re_src, Elf32_Rel *re_end) 89 { 90 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 91 Elf32_Addr *offset_ptr_ram; 92 93 do { 94 /* Get the location from the relocation entry */ 95 offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset; 96 97 /* Check that the location of the relocation is in .text */ 98 if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base && 99 offset_ptr_rom > last_offset) { 100 101 /* Switch to the in-RAM version */ 102 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 103 gd->reloc_off); 104 105 /* Check that the target points into .text */ 106 if (*offset_ptr_ram >= text_base && 107 *offset_ptr_ram <= text_base + size) { 108 *offset_ptr_ram += gd->reloc_off; 109 } else { 110 debug(" %p: rom reloc %x, ram %p, value %x, limit %lX\n", 111 re_src, re_src->r_offset, offset_ptr_ram, 112 *offset_ptr_ram, text_base + size); 113 } 114 } else { 115 debug(" %p: rom reloc %x, last %p\n", re_src, 116 re_src->r_offset, last_offset); 117 } 118 last_offset = offset_ptr_rom; 119 120 } while (++re_src < re_end); 121 } 122 #endif 123 124 /* 125 * This function has more error checking than you might expect. Please see 126 * this commit message for more information: 127 * 62f7970a x86: Add error checking to x86 relocation code 128 */ 129 int do_elf_reloc_fixups(void) 130 { 131 void *re_src = (void *)(&__rel_dyn_start); 132 void *re_end = (void *)(&__rel_dyn_end); 133 uint text_base; 134 135 /* The size of the region of u-boot that runs out of RAM. */ 136 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 137 138 if (gd->flags & GD_FLG_SKIP_RELOC) 139 return 0; 140 if (re_src == re_end) 141 panic("No relocation data"); 142 143 #ifdef CONFIG_SYS_TEXT_BASE 144 text_base = CONFIG_SYS_TEXT_BASE; 145 #else 146 panic("No CONFIG_SYS_TEXT_BASE"); 147 #endif 148 #if CONFIG_IS_ENABLED(X86_64) 149 do_elf_reloc_fixups64(text_base, size, re_src, re_end); 150 #else 151 do_elf_reloc_fixups32(text_base, size, re_src, re_end); 152 #endif 153 154 return 0; 155 } 156