arch/x86/lib/relocate.c

   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         do {
  80                 /* Get the location from the relocation entry */
  81                 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
  82
  83                 /* Check that the location of the relocation is in .text */
  84                 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE &&
  85                                 offset_ptr_rom > last_offset) {
  86
  87                         /* Switch to the in-RAM version */
  88                         offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
  89                                                         gd->reloc_off);
  90
  91                         /* Check that the target points into .text */
  92                         if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE &&
  93                                         *offset_ptr_ram <=
  94                                         (CONFIG_SYS_TEXT_BASE + size)) {
  95                                 *offset_ptr_ram += gd->reloc_off;
  96                         } else {
  97                                 debug("   %p: rom reloc %x, ram %p, value %x,"
  98                                         " limit %" PRIXPTR "\n", re_src,
  99                                         re_src->r_offset, offset_ptr_ram,
 100                                         *offset_ptr_ram,
 101                                         CONFIG_SYS_TEXT_BASE + size);
 102                         }
 103                 } else {
 104                         debug("   %p: rom reloc %x, last %p\n", re_src,
 105                                re_src->r_offset, last_offset);
 106                 }
 107                 last_offset = offset_ptr_rom;
 108
 109         } while (++re_src < re_end);
 110
 111         return 0;
 112 }