LXR uboot/arch/arm/lib/reloc_aarch64

   1/* reloc_aarch64.c - position independent x86 ELF shared object relocator
   2   Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
   3   Copyright (C) 1999 Hewlett-Packard Co.
   4        Contributed by David Mosberger <davidm@hpl.hp.com>.
   5
   6    All rights reserved.
   7
   8    Redistribution and use in source and binary forms, with or without
   9    modification, are permitted provided that the following conditions
  10    are met:
  11
  12    * Redistributions of source code must retain the above copyright
  13      notice, this list of conditions and the following disclaimer.
  14    * Redistributions in binary form must reproduce the above
  15      copyright notice, this list of conditions and the following
  16      disclaimer in the documentation and/or other materials
  17      provided with the distribution.
  18    * Neither the name of Hewlett-Packard Co. nor the names of its
  19      contributors may be used to endorse or promote products derived
  20      from this software without specific prior written permission.
  21
  22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  23    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  24    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
  27    BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  28    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  29    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  32    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  33    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34    SUCH DAMAGE.
  35*/
  36
  37#include <efi.h>
  38
  39#include <elf.h>
  40
  41efi_status_t EFIAPI _relocate(long ldbase, Elf64_Dyn *dyn)
  42{
  43        long relsz = 0, relent = 0;
  44        Elf64_Rela *rel = 0;
  45        unsigned long *addr;
  46        int i;
  47
  48        for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  49                switch (dyn[i].d_tag) {
  50                case DT_RELA:
  51                        rel = (Elf64_Rela *)((ulong)dyn[i].d_un.d_ptr + ldbase);
  52                        break;
  53                case DT_RELASZ:
  54                        relsz = dyn[i].d_un.d_val;
  55                        break;
  56                case DT_RELAENT:
  57                        relent = dyn[i].d_un.d_val;
  58                        break;
  59                default:
  60                        break;
  61                }
  62        }
  63
  64        if (!rel && relent == 0)
  65                return EFI_SUCCESS;
  66
  67        if (!rel || relent == 0)
  68                return EFI_LOAD_ERROR;
  69
  70        while (relsz > 0) {
  71                /* apply the relocs */
  72                switch (ELF64_R_TYPE(rel->r_info)) {
  73                case R_AARCH64_NONE:
  74                        break;
  75                case R_AARCH64_RELATIVE:
  76                        addr = (ulong *)(ldbase + rel->r_offset);
  77                        *addr = ldbase + rel->r_addend;
  78                        break;
  79                default:
  80                        break;
  81                }
  82                rel = (Elf64_Rela *)((char *)rel + relent);
  83                relsz -= relent;
  84        }
  85        return EFI_SUCCESS;
  86}
  87