git.sur5r.net Git - u-boot/blob - arch/arm/lib/reloc_arm_efi.c

   1 /*
   2  * reloc_arm.c - position-independent ARM ELF shared object relocator
   3  *
   4  * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
   5  * Copyright (C) 1999 Hewlett-Packard Co.
   6  * Contributed by David Mosberger <davidm@hpl.hp.com>.
   7  *
   8  * All rights reserved.
   9  *
  10  * SPDX-License-Identifier:     BSD-3-Clause
  11  *
  12  * This file is taken and modified from the gnu-efi project.
  13  */
  14
  15 #include <efi.h>
  16 #include <elf.h>
  17
  18 efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
  19                        struct efi_system_table *systab)
  20 {
  21         long relsz = 0, relent = 0;
  22         Elf32_Rel *rel = 0;
  23         ulong *addr;
  24         int i;
  25
  26         for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  27                 switch (dyn[i].d_tag) {
  28                 case DT_REL:
  29                         rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr
  30                                         + ldbase);
  31                         break;
  32                 case DT_RELSZ:
  33                         relsz = dyn[i].d_un.d_val;
  34                         break;
  35                 case DT_RELENT:
  36                         relent = dyn[i].d_un.d_val;
  37                         break;
  38                 default:
  39                         break;
  40                 }
  41         }
  42
  43         if (!rel && relent == 0)
  44                 return EFI_SUCCESS;
  45
  46         if (!rel || relent == 0)
  47                 return EFI_LOAD_ERROR;
  48
  49         while (relsz > 0) {
  50                 /* apply the relocs */
  51                 switch (ELF32_R_TYPE(rel->r_info)) {
  52                 case R_ARM_NONE:
  53                         break;
  54                 case R_ARM_RELATIVE:
  55                         addr = (ulong *)(ldbase + rel->r_offset);
  56                         *addr += ldbase;
  57                         break;
  58                 default:
  59                         break;
  60                 }
  61                 rel = (Elf32_Rel *)((char *)rel + relent);
  62                 relsz -= relent;
  63         }
  64
  65         return EFI_SUCCESS;
  66 }