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

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