// SPDX-License-Identifier: BSD-3-Clause /* * reloc_x86_64.c - position independent x86_64 ELF shared object relocator * Copyright (C) 1999 Hewlett-Packard Co. * Contributed by David Mosberger <davidm@hpl.hp.com>. * Copyright (C) 2005 Intel Co. * Contributed by Fenghua Yu <fenghua.yu@intel.com>. * * All rights reserved. */ #include <common.h> #include <efi.h> #include <elf.h> efi_status_t EFIAPI _relocate(long ldbase, Elf64_Dyn *dyn) { long relsz = 0, relent = 0; Elf64_Rel *rel = 0; unsigned long *addr; int i; for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { switch (dyn[i].d_tag) { case DT_RELA: rel = (Elf64_Rel *) ((unsigned long)dyn[i].d_un.d_ptr + ldbase); break; case DT_RELASZ: relsz = dyn[i].d_un.d_val; break; case DT_RELAENT: relent = dyn[i].d_un.d_val; break; default: break; } } if (!rel && relent == 0) return EFI_SUCCESS; if (!rel || relent == 0) return EFI_LOAD_ERROR; while (relsz > 0) { /* apply the relocs */ switch (ELF64_R_TYPE(rel->r_info)) { case R_X86_64_NONE: break; case R_X86_64_RELATIVE: addr = (unsigned long *)(ldbase + rel->r_offset); *addr += ldbase; break; default: break; } rel = (Elf64_Rel *)((char *)rel + relent); relsz -= relent; } return EFI_SUCCESS; }