reloc_ia32_efi.c 1.2 KB

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  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. #include <common.h>
  10. #include <efi.h>
  11. #include <elf.h>
  12. efi_status_t EFIAPI _relocate(long ldbase, Elf32_Dyn *dyn)
  13. {
  14. long relsz = 0, relent = 0;
  15. Elf32_Rel *rel = 0;
  16. unsigned long *addr;
  17. int i;
  18. for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  19. switch (dyn[i].d_tag) {
  20. case DT_REL:
  21. rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr +
  22. ldbase);
  23. break;
  24. case DT_RELSZ:
  25. relsz = dyn[i].d_un.d_val;
  26. break;
  27. case DT_RELENT:
  28. relent = dyn[i].d_un.d_val;
  29. break;
  30. case DT_RELA:
  31. break;
  32. default:
  33. break;
  34. }
  35. }
  36. if (!rel && relent == 0)
  37. return EFI_SUCCESS;
  38. if (!rel || relent == 0)
  39. return EFI_LOAD_ERROR;
  40. while (relsz > 0) {
  41. /* apply the relocs */
  42. switch (ELF32_R_TYPE(rel->r_info)) {
  43. case R_386_NONE:
  44. break;
  45. case R_386_RELATIVE:
  46. addr = (unsigned long *)(ldbase + rel->r_offset);
  47. *addr += ldbase;
  48. break;
  49. default:
  50. break;
  51. }
  52. rel = (Elf32_Rel *)((char *)rel + relent);
  53. relsz -= relent;
  54. }
  55. return EFI_SUCCESS;
  56. }