1 /* 2 * reloc_x86_64.c - position independent x86_64 ELF shared object relocator 3 * Copyright (C) 1999 Hewlett-Packard Co. 4 * Contributed by David Mosberger <davidm@hpl.hp.com>. 5 * Copyright (C) 2005 Intel Co. 6 * Contributed by Fenghua Yu <fenghua.yu@intel.com>. 7 * 8 * All rights reserved. 9 * 10 * SPDX-License-Identifier: BSD-3-Clause 11 */ 12 13 #include <common.h> 14 #include <efi.h> 15 #include <elf.h> 16 #include <asm/elf.h> 17 18 efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image, 19 struct efi_system_table *systab) 20 { 21 long relsz = 0, relent = 0; 22 Elf64_Rel *rel = 0; 23 unsigned long *addr; 24 int i; 25 26 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 27 switch (dyn[i].d_tag) { 28 case DT_RELA: 29 rel = (Elf64_Rel *) 30 ((unsigned long)dyn[i].d_un.d_ptr + ldbase); 31 break; 32 case DT_RELASZ: 33 relsz = dyn[i].d_un.d_val; 34 break; 35 case DT_RELAENT: 36 relent = dyn[i].d_un.d_val; 37 break; 38 default: 39 break; 40 } 41 } 42 43 if (!rel && relent == 0) 44 return EFI_SUCCESS; 45 46 if (!rel || relent == 0) 47 return EFI_LOAD_ERROR; 48 49 while (relsz > 0) { 50 /* apply the relocs */ 51 switch (ELF64_R_TYPE(rel->r_info)) { 52 case R_X86_64_NONE: 53 break; 54 case R_X86_64_RELATIVE: 55 addr = (unsigned long *)(ldbase + rel->r_offset); 56 *addr += ldbase; 57 break; 58 default: 59 break; 60 } 61 rel = (Elf64_Rel *)((char *)rel + relent); 62 relsz -= relent; 63 } 64 65 return EFI_SUCCESS; 66 } 67