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 = (size_t)&__data_end - (size_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 = (size_t)&__bss_end - (size_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 /* 51 * This function has more error checking than you might expect. Please see 52 * the commit message for more informaiton. 53 */ 54 int do_elf_reloc_fixups(void) 55 { 56 Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start); 57 Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end); 58 59 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 60 Elf32_Addr *offset_ptr_ram; 61 unsigned int text_base = 0; 62 63 /* The size of the region of u-boot that runs out of RAM. */ 64 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 65 66 if (gd->flags & GD_FLG_SKIP_RELOC) 67 return 0; 68 if (re_src == re_end) 69 panic("No relocation data"); 70 71 #ifdef CONFIG_SYS_TEXT_BASE 72 text_base = CONFIG_SYS_TEXT_BASE; 73 #else 74 panic("No CONFIG_SYS_TEXT_BASE"); 75 #endif 76 do { 77 /* Get the location from the relocation entry */ 78 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 79 80 /* Check that the location of the relocation is in .text */ 81 if (offset_ptr_rom >= (Elf32_Addr *)text_base && 82 offset_ptr_rom > last_offset) { 83 84 /* Switch to the in-RAM version */ 85 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 86 gd->reloc_off); 87 88 /* Check that the target points into .text */ 89 if (*offset_ptr_ram >= text_base && 90 *offset_ptr_ram <= text_base + size) { 91 *offset_ptr_ram += gd->reloc_off; 92 } else { 93 debug(" %p: rom reloc %x, ram %p, value %x," 94 " limit %" PRIXPTR "\n", re_src, 95 re_src->r_offset, offset_ptr_ram, 96 *offset_ptr_ram, 97 text_base + size); 98 } 99 } else { 100 debug(" %p: rom reloc %x, last %p\n", re_src, 101 re_src->r_offset, last_offset); 102 } 103 last_offset = offset_ptr_rom; 104 105 } while (++re_src < re_end); 106 107 return 0; 108 } 109