git.sur5r.net Git - u-boot/blob - arch/x86/lib/reloc_ia32_efi.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /*
   3  * reloc_ia32.c - position independent x86 ELF shared object relocator
   4  * Copyright (C) 1999 Hewlett-Packard Co.
   5  * Contributed by David Mosberger <davidm@hpl.hp.com>.
   6  *
   7  * All rights reserved.
   8  */
   9
  10 #include <common.h>
  11 #include <efi.h>
  12 #include <elf.h>
  13 #include <asm/elf.h>
  14
  15 efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
  16                        struct efi_system_table *systab)
  17 {
  18         long relsz = 0, relent = 0;
  19         Elf32_Rel *rel = 0;
  20         unsigned long *addr;
  21         int i;
  22
  23         for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  24                 switch (dyn[i].d_tag) {
  25                 case DT_REL:
  26                         rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr +
  27                                                                 ldbase);
  28                         break;
  29
  30                 case DT_RELSZ:
  31                         relsz = dyn[i].d_un.d_val;
  32                         break;
  33
  34                 case DT_RELENT:
  35                         relent = dyn[i].d_un.d_val;
  36                         break;
  37
  38                 case DT_RELA:
  39                         break;
  40
  41                 default:
  42                         break;
  43                 }
  44         }
  45
  46         if (!rel && relent == 0)
  47                 return EFI_SUCCESS;
  48
  49         if (!rel || relent == 0)
  50                 return EFI_LOAD_ERROR;
  51
  52         while (relsz > 0) {
  53                 /* apply the relocs */
  54                 switch (ELF32_R_TYPE(rel->r_info)) {
  55                 case R_386_NONE:
  56                         break;
  57
  58                 case R_386_RELATIVE:
  59                         addr = (unsigned long *)(ldbase + rel->r_offset);
  60                         *addr += ldbase;
  61                         break;
  62
  63                 default:
  64                         break;
  65                 }
  66                 rel = (Elf32_Rel *)((char *)rel + relent);
  67                 relsz -= relent;
  68         }
  69
  70         return EFI_SUCCESS;
  71 }