reloc_arm_efi.c 1.3 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465
  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 _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. ulong *addr;
  21. int i;
  22. for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  23. switch (dyn[i].d_tag) {
  24. case DT_REL:
  25. rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr
  26. + ldbase);
  27. break;
  28. case DT_RELSZ:
  29. relsz = dyn[i].d_un.d_val;
  30. break;
  31. case DT_RELENT:
  32. relent = dyn[i].d_un.d_val;
  33. break;
  34. default:
  35. break;
  36. }
  37. }
  38. if (!rel && relent == 0)
  39. return EFI_SUCCESS;
  40. if (!rel || relent == 0)
  41. return EFI_LOAD_ERROR;
  42. while (relsz > 0) {
  43. /* apply the relocs */
  44. switch (ELF32_R_TYPE(rel->r_info)) {
  45. case R_ARM_NONE:
  46. break;
  47. case R_ARM_RELATIVE:
  48. addr = (ulong *)(ldbase + rel->r_offset);
  49. *addr += ldbase;
  50. break;
  51. default:
  52. break;
  53. }
  54. rel = (Elf32_Rel *)((char *)rel + relent);
  55. relsz -= relent;
  56. }
  57. return EFI_SUCCESS;
  58. }