git.sur5r.net Git - u-boot/blob - 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 <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         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 = (size_t)&__bss_end - (size_t)&__bss_start;
  40
  41         memset((void *)dst_addr, 0x00, len);
  42
  43         return 0;
  44 }
  45
  46 /*
  47  * This function has more error checking than you might expect. Please see
  48  * the commit message for more informaiton.
  49  */
  50 int do_elf_reloc_fixups(void)
  51 {
  52         Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start);
  53         Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end);
  54
  55         Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
  56         Elf32_Addr *offset_ptr_ram;
  57
  58         /* The size of the region of u-boot that runs out of RAM. */
  59         uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
  60
  61         if (re_src == re_end)
  62                 panic("No relocation data");
  63
  64         do {
  65                 /* Get the location from the relocation entry */
  66                 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
  67
  68                 /* Check that the location of the relocation is in .text */
  69                 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE &&
  70                                 offset_ptr_rom > last_offset) {
  71
  72                         /* Switch to the in-RAM version */
  73                         offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
  74                                                         gd->reloc_off);
  75
  76                         /* Check that the target points into .text */
  77                         if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE &&
  78                                         *offset_ptr_ram <=
  79                                         (CONFIG_SYS_TEXT_BASE + size)) {
  80                                 *offset_ptr_ram += gd->reloc_off;
  81                         } else {
  82                                 debug("   %p: rom reloc %x, ram %p, value %x,"
  83                                         " limit %" PRIXPTR "\n", re_src,
  84                                         re_src->r_offset, offset_ptr_ram,
  85                                         *offset_ptr_ram,
  86                                         CONFIG_SYS_TEXT_BASE + size);
  87                         }
  88                 } else {
  89                         debug("   %p: rom reloc %x, last %p\n", re_src,
  90                                re_src->r_offset, last_offset);
  91                 }
  92                 last_offset = offset_ptr_rom;
  93
  94         } while (++re_src < re_end);
  95
  96         return 0;
  97 }