reloc_arm_efi.c 1.2 KB

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  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. #include <efi.h>
  14. #include <elf.h>
  15. efi_status_t EFIAPI _relocate(long ldbase, Elf32_Dyn *dyn)
  16. {
  17. long relsz = 0, relent = 0;
  18. Elf32_Rel *rel = 0;
  19. ulong *addr;
  20. int i;
  21. for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  22. switch (dyn[i].d_tag) {
  23. case DT_REL:
  24. rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr
  25. + ldbase);
  26. break;
  27. case DT_RELSZ:
  28. relsz = dyn[i].d_un.d_val;
  29. break;
  30. case DT_RELENT:
  31. relent = dyn[i].d_un.d_val;
  32. break;
  33. default:
  34. break;
  35. }
  36. }
  37. if (!rel && relent == 0)
  38. return EFI_SUCCESS;
  39. if (!rel || relent == 0)
  40. return EFI_LOAD_ERROR;
  41. while (relsz > 0) {
  42. /* apply the relocs */
  43. switch (ELF32_R_TYPE(rel->r_info)) {
  44. case R_ARM_NONE:
  45. break;
  46. case R_ARM_RELATIVE:
  47. addr = (ulong *)(ldbase + rel->r_offset);
  48. *addr += ldbase;
  49. break;
  50. default:
  51. break;
  52. }
  53. rel = (Elf32_Rel *)((char *)rel + relent);
  54. relsz -= relent;
  55. }
  56. return EFI_SUCCESS;
  57. }