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 <libfdt.h> 21 #include <malloc.h> 22 #include <asm/u-boot-x86.h> 23 #include <asm/relocate.h> 24 #include <asm/sections.h> 25 #include <elf.h> 26 27 DECLARE_GLOBAL_DATA_PTR; 28 29 int copy_uboot_to_ram(void) 30 { 31 size_t len = (size_t)&__data_end - (size_t)&__text_start; 32 33 memcpy((void *)gd->relocaddr, (void *)&__text_start, len); 34 35 return 0; 36 } 37 38 int copy_fdt_to_ram(void) 39 { 40 if (gd->new_fdt) { 41 ulong fdt_size; 42 43 fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32); 44 45 memcpy(gd->new_fdt, gd->fdt_blob, fdt_size); 46 debug("Relocated fdt from %p to %p, size %lx\n", 47 gd->fdt_blob, gd->new_fdt, fdt_size); 48 gd->fdt_blob = gd->new_fdt; 49 } 50 51 return 0; 52 } 53 54 int clear_bss(void) 55 { 56 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 57 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 58 59 memset((void *)dst_addr, 0x00, len); 60 61 return 0; 62 } 63 64 /* 65 * This function has more error checking than you might expect. Please see 66 * the commit message for more informaiton. 67 */ 68 int do_elf_reloc_fixups(void) 69 { 70 Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start); 71 Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end); 72 73 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 74 Elf32_Addr *offset_ptr_ram; 75 76 /* The size of the region of u-boot that runs out of RAM. */ 77 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 78 79 if (re_src == re_end) 80 panic("No relocation data"); 81 82 do { 83 /* Get the location from the relocation entry */ 84 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 85 86 /* Check that the location of the relocation is in .text */ 87 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE && 88 offset_ptr_rom > last_offset) { 89 90 /* Switch to the in-RAM version */ 91 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 92 gd->reloc_off); 93 94 /* Check that the target points into .text */ 95 if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE && 96 *offset_ptr_ram <= 97 (CONFIG_SYS_TEXT_BASE + size)) { 98 *offset_ptr_ram += gd->reloc_off; 99 } else { 100 debug(" %p: rom reloc %x, ram %p, value %x," 101 " limit %" PRIXPTR "\n", re_src, 102 re_src->r_offset, offset_ptr_ram, 103 *offset_ptr_ram, 104 CONFIG_SYS_TEXT_BASE + size); 105 } 106 } else { 107 debug(" %p: rom reloc %x, last %p\n", re_src, 108 re_src->r_offset, last_offset); 109 } 110 last_offset = offset_ptr_rom; 111 112 } while (++re_src < re_end); 113 114 return 0; 115 } 116